tricu

commit 40c09addfb781c1dfaf92b230257421166af39c4
parent 926c6dee60247284686049cb4810897cab870265
Author: James Eversole <james@eversole.co>
Date:   Thu, 22 Oct 2026 09:35:17 -0500

Integrate CodeMirror editing and per-line import hash folding

Use one canonical editor document for source, selection and history. Replace declaration hit-box overlays with inline marks and retain explicit IO, revision checks, draft recovery and undoable imports.

Build the pinned editor sources and licenses through Nix. Cover hash projection, native clipboard/caret mapping, dynamic import undo/redo and editor parity in the browser suites.

Diffstat:
M
ext/demo-site/README.md
 | 
64
++++++++++++++++++++++++++++++++++++++++------------------------
M
ext/demo-site/build.sh
 | 
13
+++++++------
A
ext/demo-site/codemirror/default.nix
 | 
28
++++++++++++++++++++++++++++
A
ext/demo-site/codemirror/entry.ts
 | 
3
+++
A
ext/demo-site/codemirror/sources.json
 | 
123
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A
ext/demo-site/codemirror/typecheck.py
 | 
9
+++++++++
M
ext/demo-site/dist/app.js
 | 
54
+++++++++++++++++++++++++++---------------------------
A
ext/demo-site/dist/codemirror.LICENSE.txt
 | 
247
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A
ext/demo-site/dist/codemirror.js
 | 
10
++++++++++
M
ext/demo-site/dist/definition-inspector.js
 | 
272
++++++++++++++++++++++++++++++-------------------------------------------------
A
ext/demo-site/dist/import-folds.js
 | 
109
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
M
ext/demo-site/dist/import-picker.js
 | 
16
+++++-----------
A
ext/demo-site/dist/source-editor.js
 | 
177
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
M
ext/demo-site/dist/syntax.js
 | 
60
+++++++++---------------------------------------------------
M
ext/demo-site/index.html
 | 
4
++--
A
ext/demo-site/javascript.nix
 | 
24
++++++++++++++++++++++++
M
ext/demo-site/release.nix
 | 
4
+++-
M
ext/demo-site/src/app.ts
 | 
47
++++++++++++++++++++++++-----------------------
A
ext/demo-site/src/codemirror.d.ts
 | 
4
++++
M
ext/demo-site/src/definition-inspector.ts
 | 
204
++++++++++++++++++++++++++-----------------------------------------------------
A
ext/demo-site/src/import-folds.ts
 | 
83
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
M
ext/demo-site/src/import-picker.ts
 | 
18
+++++++-----------
A
ext/demo-site/src/source-editor.ts
 | 
142
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
M
ext/demo-site/src/syntax.ts
 | 
47
+++++++++--------------------------------------
M
ext/demo-site/style.css
 | 
32
++++++++++++++------------------
M
ext/demo-site/test/asset-cache-probe.mjs
 | 
2
+-
M
ext/demo-site/test/backend-browser.mjs
 | 
21
+++++++++++----------
M
ext/demo-site/test/backend-probe.mjs
 | 
10
+++++-----
M
ext/demo-site/test/backend-server.mjs
 | 
3
++-
M
ext/demo-site/test/backend-webkit.mjs
 | 
13
++++++++-----
M
ext/demo-site/test/basic-examples-probe.mjs
 | 
6
+++---
M
ext/demo-site/test/definition-name-inputs.mjs
 | 
39
+++++++++++++++++++--------------------
M
ext/demo-site/test/definition-names-probe.mjs
 | 
64
++++++++++++++++++++++++----------------------------------------
M
ext/demo-site/test/firefox-idle.mjs
 | 
12
++++++------
A
ext/demo-site/test/import-fold-inputs.mjs
 | 
44
++++++++++++++++++++++++++++++++++++++++++++
A
ext/demo-site/test/import-folds-probe.mjs
 | 
28
++++++++++++++++++++++++++++
A
ext/demo-site/test/import-folds.test.mjs
 | 
28
++++++++++++++++++++++++++++
M
ext/demo-site/test/import-picker-probe.mjs
 | 
26
+++++++++++++-------------
M
ext/demo-site/test/inline-io-probe.mjs
 | 
5
+++--
M
ext/demo-site/test/live-ux-probe.mjs
 | 
6
+++---
M
ext/demo-site/test/local-module-probe.mjs
 | 
2
+-
M
ext/demo-site/test/module-probe.mjs
 | 
12
++++++------
M
ext/demo-site/test/probe-api.mjs
 | 
2
++
M
ext/demo-site/test/site.test.mjs
 | 
4
++--
M
ext/demo-site/test/source-probe-helpers.mjs
 | 
12
++++++++----
M
ext/demo-site/test/syntax-probe.mjs
 | 
87
+++++++++++++++++++++++++------------------------------------------------------
M
flake.nix
 | 
9
++++++---

47 files changed, 1524 insertions(+), 705 deletions(-)
diff --git a/ext/demo-site/README.md b/ext/demo-site/README.md
@@ -60,17 +60,27 @@ and layout rules; compiler diagnostics resolve names and validate source.
 A collapsed caret immediately beside `()`, `[]` or `{}` highlights its matching
 partner. An unmatched delimiter gets a wavy underline. Strings and comments are
 excluded, including non-nesting block comments. Range selections do not highlight
-a pair. There is no automatic bracket insertion, indentation rewriting or
-completion. Highlighting does not compile or execute programs.
-
-The local `syntax.ts` renderer decorates native textareas. Decorative
-mirrors are hidden from accessibility APIs and never interpret source as HTML.
-Selection, undo, resizing and scrolling remain native. During IME composition and
-in forced-colors mode, native text remains visible instead of the colored mirror.
-Programmatic source/preset changes explicitly refresh the decoration without
-synthesizing edits or starting compilation. Sources over 32,768 UTF-16 code units
-fall back to plain text, bounding decoration work without truncating source or
-changing execution limits. This also covers large read-only library sources.
+a pair. Enter inserts a plain newline, preserving explicit indentation. Highlighting
+updates as the document and selection change.
+
+CodeMirror 6 owns the canonical document, selection and undo history. The local
+`syntax.ts` lexer supplies highlighting and declaration sites; CodeMirror renders
+source as text. Document loads reset history; import insertion is one isolated
+undoable transaction. Native input and clipboard events use canonical UTF-16
+document offsets. Sources over 32,768 UTF-16 code units use plain highlighting.
+Drafts retain their complete text, and compilation enforces the 16,384-scalar
+input limit with diagnostics.
+
+Import **hashes** display their first three and last three characters with literal
+dots (`abc...xyz`), in muted teal with a dotted underline. Editing an import line
+reveals its full hash; a range selection reveals every affected line, leaving
+unrelated imports folded. Each hash also has an independent keyboard-accessible
+expand/collapse control. Copying, saving and compilation use complete canonical
+source; folding and selection preserve the document and undo history.
+
+The pinned editor sources, fixed-output hashes, licenses and declaration build
+are in `codemirror/`. Nix builds and bundles the editor locally. Physical mobile
+Safari, real IME and screen-reader behavior require device/manual validation.
 
 ## Runtime selection
 
@@ -136,9 +146,10 @@ TEST_IDE=1 TEST_BACKEND=haskell-wasm \
 
 Repeat with `TEST_BACKEND=zig-wasm` and with `TEST_MODULES=1`,
 `TEST_LOCAL_MODULES=1`, or `TEST_ASSET_CACHE=1` in place of `TEST_IDE=1`.
-The IDE, complete demo/module, local-file and cache suites pass on both backends
-with Playwright 1.59.1 / WebKit build 2272. The runner also checks layout at
-320, 390 and 1280 pixels after textarea mirror resize observers settle.
+The runner uses Playwright 1.59.1 / WebKit build 2272 and also checks layout at
+320, 390 and 1280 pixels after editor viewport measurements settle. For the longer
+Zig IDE run, set `TEST_WEBKIT_TIMEOUT_MS=360000` (default: 240000).
+`TEST_DIAGNOSTICS=1` reports read-only page status every 30 seconds.
 `SCREENSHOT=/tmp/arboricx.png` saves a screenshot at each width.
 
 Each run uses a fresh, temporary disk-backed browser profile, matching the
@@ -159,7 +170,7 @@ A cancellable, separate Worker uses the selected native backend to inspect the
 header and compile the candidate source. Namespace conflicts and compiler
 failures appear before insertion. Existing imports offer a jump action; unfinished
 source can use Copy import. Insertion prepends a qualified directive while
-preserving all original source, supplies one native textarea undo transaction,
+preserving all original source, supplies one isolated editor undo transaction,
 and follows normal idle compilation. The dialog uses native focus containment,
 Escape cancellation and focus restoration. Each candidate check has a 60-second
 cutoff. A revision guard rejects stale replies; insertion rechecks source and
@@ -1149,8 +1160,8 @@ Use the published manifest pins with the native source import syntax above.
 Tooling comes from the repository's locked nixpkgs:
 
 ```sh
-./ext/demo-site/build.sh             # strict TS → dist/*.js (TypeScript 5.9.3)
-./ext/demo-site/build.sh --check     # fresh temporary compile; exact shipped-JS parity
+./ext/demo-site/build.sh             # pinned Nix editor bundle + strict TS → dist/*.js
+./ext/demo-site/build.sh --check     # exact generated-JS and license parity
 nix shell --inputs-from . nixpkgs#nodejs -c python3 ext/demo-site/test/run-bounded.py \
   --seconds 60 -- node --max-old-space-size=512 --test --test-concurrency=1 ext/demo-site/test/*.test.mjs
 # Independent native CLI oracle for browser module semantics:
@@ -1388,7 +1399,7 @@ TEST_IDE=1 ARBORICX_SITE_ROOT="$SITE" nix shell --inputs-from . nixpkgs#nodejs n
 ```
 
 Use `TEST_DEFINITION_NAMES=1` for declaration-name inspection, editing/focus,
-Unicode offsets, invalidation, IME, and wrapped/scrolled hit rectangles. Chromium
+Unicode offsets, invalidation, IME lifecycle, and wrapped inline hit areas. Chromium
 also sends trusted mouse/touch and Tab/Enter/Space/Escape events, verifies native
 rename/undo and cross-name drag selection, touch-hold selection and panning
 cancellation at 390/1440 pixels. `TEST_SCREENSHOT_PREFIX` saves closed/open card
@@ -1396,6 +1407,12 @@ screenshots at those widths. Firefox runs the shared compiled-definition and
 DOM/geometry checks; it does not run the CDP input checks. Physical mobile Safari
 keyboard/selection-handle behavior is not covered by these automated checks.
 
+Use `TEST_IMPORT_FOLDS=1` for hash recognition, independent toggles, per-line/range
+expansion, canonical source/revision invariance, and dynamic import undo/redo.
+Chromium additionally checks trusted mouse/touch caret placement, partial/full
+system clipboard contents, native pasted-import undo/redo, single-character hash
+deletion, plain Enter, and read-only editing at 390/1440 pixels.
+
 The focused inline IO suite can be run with `TEST_INLINE_IO=1` in that harness.
 It includes source-free IO, private entries, envelope-only recognition of a
 program with a divergent action, explicit Run, CPU-bound cancellation, closing
@@ -1415,19 +1432,18 @@ snapshots every 30 seconds; it is off by default, including idle-soak checks.
 ### Inline definition inspection and library discovery
 
 Underlined top-level declaration names toggle an anchored compiled-definition card.
-There is no inspection gutter or reserved horizontal column. Names are interactive
+Names are interactive
 only for the current successfully compiled scope (public roots for published
 packages). References and local binders stay ordinary editable text. Tab then
 Enter/Space also opens the card. **Edit name** closes it and selects the identifier
-in the native textarea for renaming; read-only source disables that action.
+in the canonical editor for renaming; read-only source disables that action.
 A touch/pen hold selects the identifier in the native editor without inspecting
 it (also available through **Edit name**); selection drags and native context
-menus do not trigger inspection. IME composition hides the hit areas. Wrapped identifiers have separate hit rectangles
-per fragment, avoiding adjacent expression text. Opening
+menus do not trigger inspection. IME composition disables name activation. Names are inline editor decorations,
+so wrapped fragments use their native text hit areas. Opening
 starts with **Auto**, checking the supported IO envelope, then preferring readable text, a natural number, a decoded list
 of text/naturals, a Boolean, bytes, then tricu tree source. The status names the
-chosen interpretation (for example **Auto → Text**); this is a display heuristic,
-not type inference. An empty tree defaults to natural zero. Readable text allows
+chosen interpretation (for example **Auto → Text**). An empty tree defaults to natural zero. Readable text allows
 Unicode letters/marks/numbers/punctuation/symbols/spaces, TAB/LF/CR, and joining
 characters, but excludes other controls, private-use and unassigned scalars.
 Manual Text still accepts any valid Unicode scalar string. A manual selection
diff --git a/ext/demo-site/build.sh b/ext/demo-site/build.sh
@@ -1,12 +1,13 @@
 #!/usr/bin/env bash
 set -euo pipefail
 cd "$(dirname "$0")/../.."
-# Resolve tooling through the repository's locked nixpkgs, not npm or a global tsc.
+# Compiler, editor sources and bundler all come from the locked Nix build.
+temporary=$(mktemp -d)
+trap 'rm -rf "$temporary"' EXIT
+nix build .#arboricxSiteJavaScript --out-link "$temporary/javascript"
 if [[ "${1:-}" == --check ]]; then
-  temporary=$(mktemp -d)
-  trap 'rm -rf "$temporary"' EXIT
-  nix shell --inputs-from . nixpkgs#typescript -c tsc -p ext/demo-site/tsconfig.json --outDir "$temporary"
-  diff -ru ext/demo-site/dist "$temporary"
+  diff -ru ext/demo-site/dist "$temporary/javascript/"
 else
-  nix shell --inputs-from . nixpkgs#typescript -c tsc -p ext/demo-site/tsconfig.json
+  cp -rL "$temporary/javascript/." ext/demo-site/dist/
+  chmod -R u+w ext/demo-site/dist
 fi
diff --git a/ext/demo-site/codemirror/default.nix b/ext/demo-site/codemirror/default.nix
@@ -0,0 +1,28 @@
+{ pkgs }:
+let
+  lock = builtins.fromJSON (builtins.readFile ./sources.json);
+  sources = builtins.listToAttrs (map (row: {
+    name = row.slug;
+    value = pkgs.fetchzip { url = "https://api.github.com/repos/${row.repo}/tarball/${row.rev}"; hash = row.hash; extension = "tar.gz"; };
+  }) lock);
+  aliases = pkgs.lib.concatMapStringsSep " " (row: "--alias:${row.name}=${sources.${row.slug}}/${row.entry}") lock;
+  dependencies = pkgs.lib.concatMapStringsSep "\n" (row: ''
+    cp -r ${sources.${row.slug}} "deps/${row.slug}"
+  '') lock;
+  licenses = pkgs.lib.concatMapStringsSep "\n" (row: ''
+    cp ${sources.${row.slug}}/LICENSE "$out/licenses/${row.slug}.txt"
+  '') lock;
+in pkgs.runCommand "arboricx-codemirror" { nativeBuildInputs = [pkgs.esbuild pkgs.typescript pkgs.python3]; } ''
+  mkdir -p "$out/licenses"
+  cp ${./entry.ts} entry.ts
+  mkdir -p deps
+  ${dependencies}
+  cp ${./sources.json} sources.json
+  python3 ${./typecheck.py}
+  tsc -p tsconfig.upstream.json
+  esbuild entry.ts --bundle --format=esm --target=es2022 --tsconfig-raw='{"compilerOptions":{"useDefineForClassFields":false}}' --minify --legal-comments=linked ${aliases} --outfile="$out/codemirror.js" --metafile="$out/bundle-meta.json"
+  cp ${./sources.json} "$out/sources.json"
+  ${licenses}
+  cp -r types "$out/types"
+  cp -r deps "$out/deps"
+''
diff --git a/ext/demo-site/codemirror/entry.ts b/ext/demo-site/codemirror/entry.ts
@@ -0,0 +1,3 @@
+export {EditorState, StateField, StateEffect, Transaction, EditorSelection, Compartment} from '@codemirror/state';
+export {EditorView, Decoration, WidgetType, keymap, drawSelection} from '@codemirror/view';
+export {history, historyKeymap, standardKeymap, isolateHistory, undo, redo, insertNewline} from '@codemirror/commands';
diff --git a/ext/demo-site/codemirror/sources.json b/ext/demo-site/codemirror/sources.json
@@ -0,0 +1,123 @@
+[
+  {
+    "name": "@codemirror/state",
+    "repo": "codemirror/state",
+    "rev": "821d9b772a1d2d9c989b6ae472513380bf10136b",
+    "tag": "6.6.0",
+    "version": "6.6.0",
+    "entry": "src/index.ts",
+    "hash": "sha256-4Qv8CcNDpf3iFIpoAvQF4lGMBjPZ2UeP37hZHYDiPPM=",
+    "slug": "codemirror-state",
+    "license": "MIT"
+  },
+  {
+    "name": "@codemirror/view",
+    "repo": "codemirror/view",
+    "rev": "a0a5ed946cfdfde61dcf33b131d551136378ccf9",
+    "tag": "6.41.0",
+    "version": "6.41.0",
+    "entry": "src/index.ts",
+    "hash": "sha256-VRVHvoDDgObm/WodDMYFpux+s+emALDAJnm37VVhjV0=",
+    "slug": "codemirror-view",
+    "license": "MIT"
+  },
+  {
+    "name": "@codemirror/commands",
+    "repo": "codemirror/commands",
+    "rev": "6f83cb93abc81cb13993ce4805aafce45bfe2853",
+    "tag": "6.10.3",
+    "version": "6.10.3",
+    "entry": "src/commands.ts",
+    "hash": "sha256-jov9JLmRlaFfoe8fv6J/t2Iyv32fSiweryJLLOIBjWU=",
+    "slug": "codemirror-commands",
+    "license": "MIT"
+  },
+  {
+    "name": "@codemirror/language",
+    "repo": "codemirror/language",
+    "rev": "f5af31eed71fa22e8c110d74e61098c0fb1c1acb",
+    "tag": "6.12.3",
+    "version": "6.12.3",
+    "entry": "src/index.ts",
+    "hash": "sha256-8l781Wyg8oydTDohmy45dReGIpVNSJ9TwgA2wwy6N2w=",
+    "slug": "codemirror-language",
+    "license": "MIT"
+  },
+  {
+    "name": "@lezer/common",
+    "repo": "lezer-parser/common",
+    "rev": "de5f96276a2954c249de1475e8b03f79c20d9ce4",
+    "tag": "1.5.2",
+    "version": "1.5.2",
+    "entry": "src/index.ts",
+    "hash": "sha256-Sfbg8NRzqu66FfKGDn7V6+8vw55dvATZBkBUqAnGDRo=",
+    "slug": "lezer-parser-common",
+    "license": "MIT"
+  },
+  {
+    "name": "@lezer/highlight",
+    "repo": "lezer-parser/highlight",
+    "rev": "37e3eef517edd8e8dc8790419d04b61a7ac28420",
+    "tag": "1.2.3",
+    "version": "1.2.3",
+    "entry": "src/highlight.ts",
+    "hash": "sha256-lNqVZ4xKMHvUy7En4zOEUPnQnSLsZeIDz9vngJOQhf4=",
+    "slug": "lezer-parser-highlight",
+    "license": "MIT"
+  },
+  {
+    "name": "@lezer/lr",
+    "repo": "lezer-parser/lr",
+    "rev": "f81d6a25c3482aa7fc12434e9adea9d75c56ad08",
+    "tag": "1.4.8",
+    "version": "1.4.8",
+    "entry": "src/index.ts",
+    "hash": "sha256-fdBQfez64NEj3ZHz+eVSG0U5fD7OHlXJuf9udrPdDfA=",
+    "slug": "lezer-parser-lr",
+    "license": "MIT"
+  },
+  {
+    "name": "@marijn/find-cluster-break",
+    "repo": "marijnh/find-cluster-break",
+    "rev": "b0b1f10aa0c131cf53f2dc347a09544b4ae87324",
+    "tag": "1.0.2",
+    "version": "1.0.2",
+    "entry": "src/index.js",
+    "hash": "sha256-y8B89SiEXGxJtAjI95quAzYheHMQEXBp3Eh7IHog6Ls=",
+    "slug": "marijnh-find-cluster-break",
+    "license": "MIT"
+  },
+  {
+    "name": "crelt",
+    "repo": "marijnh/crelt",
+    "rev": "25eabb104d50e160cd4e4acd9eed2eacb32b332b",
+    "tag": "1.0.6",
+    "version": "1.0.6",
+    "entry": "index.js",
+    "hash": "sha256-77qlhPNk0gtkjH7ZwcZ/NrzaFPJBGGgtoU12BcQhXPU=",
+    "slug": "marijnh-crelt",
+    "license": "MIT"
+  },
+  {
+    "name": "style-mod",
+    "repo": "marijnh/style-mod",
+    "rev": "f8a0376473b604184916ef2ae4f28edfaf653849",
+    "tag": "4.1.3",
+    "version": "4.1.3",
+    "entry": "src/style-mod.js",
+    "hash": "sha256-g73AMEoYTyn2UlBedtuuFIYbRvu+RnTBiZEBPUxDK2I=",
+    "slug": "marijnh-style-mod",
+    "license": "MIT"
+  },
+  {
+    "name": "w3c-keyname",
+    "repo": "marijnh/w3c-keyname",
+    "rev": "5ea93b04bb62230c7de4165e3a9b5c840f05cd44",
+    "tag": "2.2.8",
+    "version": "2.2.8",
+    "entry": "index.js",
+    "hash": "sha256-KQ7xL6ff0BBIPEkZVTT7uMQKYlWHLZnnm+AyvoBMThM=",
+    "slug": "marijnh-w3c-keyname",
+    "license": "MIT"
+  }
+]
diff --git a/ext/demo-site/codemirror/typecheck.py b/ext/demo-site/codemirror/typecheck.py
@@ -0,0 +1,9 @@
+import pathlib,json
+p=pathlib.Path.cwd(); rows=json.loads((p/'sources.json').read_text());paths={}
+for row in rows:
+ entry=p/'deps'/row['slug']/row['entry'];paths[row['name']]=[str(entry.with_suffix('.d.ts') if entry.suffix=='.js' else entry)]
+(p/'deps'/'node-env.d.ts').write_text('declare const process: { env: { LOG?: string } };\n')
+# Declaration generation only; variance and class-field settings accommodate the
+# upstream source builds. Our application is checked separately with strict flags.
+config={'compilerOptions':{'target':'ES2022','module':'ESNext','moduleResolution':'Bundler','strict':True,'strictFunctionTypes':False,'strictNullChecks':True,'useDefineForClassFields':False,'skipLibCheck':True,'declaration':True,'emitDeclarationOnly':True,'rootDir':str(p/'deps'),'outDir':str(p/'types'),'lib':['ES2022','DOM','DOM.Iterable'],'paths':paths},'include':[str(p/'deps'/'codemirror-*'/'src'/'*.ts'),str(p/'deps'/'lezer-parser-*'/'src'/'*.ts'),str(p/'deps'/'node-env.d.ts')]}
+(p/'tsconfig.upstream.json').write_text(json.dumps(config))
diff --git a/ext/demo-site/dist/app.js b/ext/demo-site/dist/app.js
@@ -1,8 +1,9 @@
+import { SourceEditor } from './source-editor.js';
 import { definitionInspector } from './definition-inspector.js';
 import { exampleGroups, exampleGroup, libraryLabel } from './program-catalogue.js';
 import { importPicker } from './import-picker.js';
 import { localModulesUI } from './local-modules-ui.js';
-import { syntaxEditor, tokenize, paintSyntax } from './syntax.js';
+import { tokenize, paintSyntax } from './syntax.js';
 import { backend, backends, runtimeStats } from './runtime-backends.js';
 import { setupInspector } from './inspector.js';
 import { ActiveClock } from './clock.js';
@@ -17,7 +18,7 @@ function el(id) {
         throw new Error(`Missing element ${id}`);
     return element;
 }
-const sourceEditor = el('source-editor'), refreshSourceSyntax = syntaxEditor(sourceEditor);
+const sourceEditor = new SourceEditor(el('source-editor'));
 const compileButton = el('compile'), restoreButton = el('restore-source');
 const downloadButton = el('download-bundle'), exportModuleButton = el('export-compiled-module');
 const backendPicker = el('runtime-backend'), programPicker = el('program-picker');
@@ -71,7 +72,7 @@ const definitions = definitionInspector(sourceEditor, (id, name, output) => {
     worker.postMessage({ type: 'inspect', id, name, output });
 }, {
     run(name, output, step) {
-        if (busy || !worker || draft && (!compiled || sourceEditor.value !== compiledSource || editRevision !== compiledRevision))
+        if (busy || !worker || draft && (!compiled || sourceEditor.getSource() !== compiledSource || editRevision !== compiledRevision))
             return;
         currentName = name;
         operation = 'running';
@@ -94,11 +95,11 @@ const definitions = definitionInspector(sourceEditor, (id, name, output) => {
     },
 });
 const imports = importPicker({ source: sourceEditor, backend: () => backendPicker.value,
-    available: () => !busy, editable: () => !busy && !sourceEditor.hidden && !sourceEditor.readOnly,
+    available: () => !busy, editable: () => !busy && !sourceEditor.dom.hidden && !sourceEditor.isReadOnly,
     tryLibrary: (library, definition) => { preferredExport = definition; loadBundle(library); },
     local: () => localModules.entries(), inputs: () => localModules.inputs() });
 function diagnostic(message = '') { el('operation-diagnostic').textContent = message; el('operation-diagnostic').hidden = !message; }
-function ready() { return !!worker && (draft ? compiled && sourceEditor.value === compiledSource && editRevision === compiledRevision : loaded); }
+function ready() { return !!worker && (draft ? compiled && sourceEditor.getSource() === compiledSource && editRevision === compiledRevision : loaded); }
 function controls(working) {
     busy = working;
     localModules.disable(busy);
@@ -114,29 +115,28 @@ function controls(working) {
     restoreButton.disabled = busy || originalSource === undefined;
     exportModuleButton.disabled = busy || !draft || !ready();
     downloadButton.disabled = busy || draft || downloadHash() === undefined;
-    sourceEditor.disabled = busy && operation !== 'compiling';
-    sourceEditor.readOnly = originalSource === undefined && !draft;
-    const editable = !sourceEditor.hidden && (draft || originalSource !== undefined);
+    sourceEditor.setAvailability(busy && operation !== 'compiling', originalSource === undefined && !draft);
+    const editable = !sourceEditor.dom.hidden && (draft || originalSource !== undefined);
     el('playground-intro').hidden = selected?.id !== 'names-values' || !editable;
     el('source-title').textContent = editable ? 'Source' : sourceAvailable ? 'Read-only source' : loaded ? 'Compiled package' : 'Package information';
     el('source-availability').hidden = editable || !loaded;
     el('source-availability').textContent = 'Browse stored definitions below, or import this module into your own source. Inspection does not execute IO.';
-    el('package-definitions').hidden = !loaded || !sourceEditor.hidden;
+    el('package-definitions').hidden = !loaded || !sourceEditor.dom.hidden;
     el('reload-package').hidden = draft || !selection || !!worker;
     el('stored-download').disabled = busy || draft || !loaded || !worker;
     el('stored-definition').disabled = el('stored-format').disabled = busy || draft || !loaded;
     el('authorship').textContent = draft ? 'Local draft · your authored code (not published)' : loaded ? 'Published package · verified executable' : 'Published selection · not yet verified';
     const modified = draft && !ready();
     el('authorship').classList.toggle('modified', modified);
-    sourceEditor.classList.toggle('modified', modified);
+    sourceEditor.dom.classList.toggle('modified', modified);
     for (const button of document.querySelectorAll('[data-compiler-example]'))
         button.disabled = busy;
     stopButton.disabled = !busy && !draft;
     stopButton.hidden = !busy;
     shareButton.disabled = busy || draft || !loaded;
     el('reset').disabled = busy;
-    refreshSourceSyntax();
-    definitions.update(!sourceEditor.hidden && ready() || sourceEditor.hidden && loaded && !!worker, busy, draft ? undefined : publishedNames);
+    sourceEditor.refresh();
+    definitions.update(!sourceEditor.dom.hidden && ready() || sourceEditor.dom.hidden && loaded && !!worker, busy, draft ? undefined : publishedNames);
     for (const button of el('package-definition-list').querySelectorAll('button'))
         button.disabled = busy || !loaded;
 }
@@ -344,16 +344,16 @@ function newWorker(preserveSource = false) {
         el('package-info').textContent = `SHA-256 verified · ${data.nodes.toLocaleString()} stored DAG nodes · ${publishedNames.length} export(s) · ${data.hash}`;
         if (!preserveSource || originalSource === undefined) {
             originalSource = selected?.environment !== undefined && data.source !== null ? data.source : undefined;
-            sourceEditor.value = originalSource ?? '';
+            sourceEditor.replaceSource(originalSource ?? '');
         }
-        sourceEditor.hidden = originalSource === undefined;
-        el('source-notes').hidden = !sourceEditor.hidden;
+        sourceEditor.dom.hidden = originalSource === undefined;
+        el('source-notes').hidden = !sourceEditor.dom.hidden;
         sourceAvailable = data.source !== null;
         el('source-label').textContent = sourceAvailable ? 'Curated tricu / stable' : 'Package metadata';
         el('source').textContent = data.source ?? `Verified package metadata\n${JSON.stringify(data.metadata, null, 2)}`;
         if (data.source !== null)
             paintSyntax(el('source'), tokenize(data.source));
-        el('package-definition-search').value = sourceEditor.hidden && requested && publishedNames.includes(requested) ? requested : '';
+        el('package-definition-search').value = sourceEditor.dom.hidden && requested && publishedNames.includes(requested) ? requested : '';
         renderPublishedNames();
         idle();
         el('status').textContent = 'Ready';
@@ -384,7 +384,7 @@ function select(entry, release) {
     publishedNames = [];
     selection = { hash: entry.hash, localId: entry.id };
     hashInput.value = entry.hash;
-    sourceEditor.hidden = true;
+    sourceEditor.dom.hidden = true;
     el('source-notes').hidden = false;
     const pinned = release ?? releases.find(r => r.hash === entry.hash && r.demo === entry.id);
     chooseProgram(`demo:${entry.id}`, pinned?.version);
@@ -402,7 +402,7 @@ function invalidateProgram() {
     selection = undefined;
     selected = undefined;
     publishedNames = [];
-    sourceEditor.hidden = true;
+    sourceEditor.dom.hidden = true;
     el('source-notes').hidden = false;
     el('source').textContent = 'Load the selected program to inspect its source or package notes.';
     el('package-info').textContent = 'No bundle loaded.';
@@ -608,10 +608,10 @@ downloadButton.onclick = () => {
         finish(event.message || 'Worker error', true); };
     current.postMessage({ type: 'load', hash });
 };
-sourceEditor.addEventListener('compositionstart', () => { composing = true; cancelIdleCompile(); });
-sourceEditor.addEventListener('compositionend', () => { composing = false; if (draft)
+sourceEditor.dom.addEventListener('compositionstart', () => { composing = true; cancelIdleCompile(); });
+sourceEditor.dom.addEventListener('compositionend', () => { composing = false; if (draft)
     queueCompile(); });
-sourceEditor.oninput = () => {
+sourceEditor.onChange(() => {
     if (busy && operation !== 'compiling')
         return;
     editRevision++;
@@ -625,7 +625,7 @@ sourceEditor.oninput = () => {
     }
     if (!worker || !compiled || busy)
         dispose();
-    draft = compiled || scratch || sourceEditor.value !== originalSource;
+    draft = compiled || scratch || sourceEditor.getSource() !== originalSource;
     controls(false);
     if (!draft && selection)
         newWorker(true);
@@ -633,14 +633,14 @@ sourceEditor.oninput = () => {
         el('status').textContent = 'Changes pending';
         queueCompile();
     }
-};
+});
 restoreButton.onclick = () => { if (originalSource === undefined || busy)
-    return; dispose(); sourceEditor.value = originalSource; sourceEditor.dispatchEvent(new Event('input')); };
+    return; dispose(); sourceEditor.replaceSource(originalSource, true); };
 compileButton.onclick = () => compileDraft();
 function compileDraft() {
     if (!draft || busy)
         return;
-    const snapshot = { revision: editRevision, source: sourceEditor.value };
+    const snapshot = { revision: editRevision, source: sourceEditor.getSource() };
     dispose();
     operation = 'compiling';
     diagnostic();
@@ -723,9 +723,9 @@ for (const button of document.querySelectorAll('[data-compiler-example]'))
         selection = undefined;
         selected = undefined;
         editRevision++;
-        sourceEditor.hidden = false;
+        sourceEditor.dom.hidden = false;
         el('source-notes').hidden = true;
-        sourceEditor.value = source;
+        sourceEditor.replaceSource(source);
         controls(false);
         el('package-info').textContent = 'Scratch program · no published bundle selected.';
         showRelease();
diff --git a/ext/demo-site/dist/codemirror.LICENSE.txt b/ext/demo-site/dist/codemirror.LICENSE.txt
@@ -0,0 +1,247 @@
+
+--- codemirror-commands.txt ---
+MIT License
+
+Copyright (C) 2018-2021 by Marijn Haverbeke <marijn@haverbeke.berlin> and others
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+
+--- codemirror-language.txt ---
+MIT License
+
+Copyright (C) 2018-2021 by Marijn Haverbeke <marijn@haverbeke.berlin> and others
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+
+--- codemirror-state.txt ---
+MIT License
+
+Copyright (C) 2018-2021 by Marijn Haverbeke <marijn@haverbeke.berlin> and others
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+
+--- codemirror-view.txt ---
+MIT License
+
+Copyright (C) 2018-2021 by Marijn Haverbeke <marijn@haverbeke.berlin> and others
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+
+--- lezer-parser-common.txt ---
+MIT License
+
+Copyright (C) 2018 by Marijn Haverbeke <marijn@haverbeke.berlin> and others
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+
+--- lezer-parser-highlight.txt ---
+MIT License
+
+Copyright (C) 2018 by Marijn Haverbeke <marijn@haverbeke.berlin> and others
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+
+--- lezer-parser-lr.txt ---
+MIT License
+
+Copyright (C) 2018 by Marijn Haverbeke <marijn@haverbeke.berlin> and others
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+
+--- marijnh-crelt.txt ---
+Copyright (C) 2020 by Marijn Haverbeke <marijn@haverbeke.berlin>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+
+--- marijnh-find-cluster-break.txt ---
+MIT License
+
+Copyright (C) 2024 by Marijn Haverbeke <marijn@haverbeke.berlin>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+
+--- marijnh-style-mod.txt ---
+Copyright (C) 2018 by Marijn Haverbeke <marijn@haverbeke.berlin> and others
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+
+--- marijnh-w3c-keyname.txt ---
+Copyright (C) 2016 by Marijn Haverbeke <marijn@haverbeke.berlin> and others
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/ext/demo-site/dist/codemirror.js b/ext/demo-site/dist/codemirror.js
@@ -0,0 +1,10 @@
+var A=class r{lineAt(e){if(e<0||e>this.length)throw new RangeError(`Invalid position ${e} in document of length ${this.length}`);return this.lineInner(e,!1,1,0)}line(e){if(e<1||e>this.lines)throw new RangeError(`Invalid line number ${e} in ${this.lines}-line document`);return this.lineInner(e,!0,1,0)}replace(e,t,n){[e,t]=Ot(this,e,t);let i=[];return this.decompose(0,e,i,2),n.length&&n.decompose(0,n.length,i,3),this.decompose(t,this.length,i,1),Rt.from(i,this.length-(t-e)+n.length)}append(e){return this.replace(this.length,this.length,e)}slice(e,t=this.length){[e,t]=Ot(this,e,t);let n=[];return this.decompose(e,t,n,0),Rt.from(n,t-e)}eq(e){if(e==this)return!0;if(e.length!=this.length||e.lines!=this.lines)return!1;let t=this.scanIdentical(e,1),n=this.length-this.scanIdentical(e,-1),i=new st(this),o=new st(e);for(let s=t,l=t;;){if(i.next(s),o.next(s),s=0,i.lineBreak!=o.lineBreak||i.done!=o.done||i.value!=o.value)return!1;if(l+=i.value.length,i.done||l>=n)return!0}}iter(e=1){return new st(this,e)}iterRange(e,t=this.length){return new Pn(this,e,t)}iterLines(e,t){let n;if(e==null)n=this.iter();else{t==null&&(t=this.lines+1);let i=this.line(e).from;n=this.iterRange(i,Math.max(i,t==this.lines+1?this.length:t<=1?0:this.line(t-1).to))}return new Vn(n)}toString(){return this.sliceString(0)}toJSON(){let e=[];return this.flatten(e),e}constructor(){}static of(e){if(e.length==0)throw new RangeError("A document must have at least one line");return e.length==1&&!e[0]?r.empty:e.length<=32?new oe(e):Rt.from(oe.split(e,[]))}},oe=class r extends A{constructor(t,n=Da(t)){super();this.text=t;this.length=n}get lines(){return this.text.length}get children(){return null}lineInner(t,n,i,o){for(let s=0;;s++){let l=this.text[s],a=o+l.length;if((n?i:a)>=t)return new Hn(o,a,i,l);o=a+1,i++}}decompose(t,n,i,o){let s=t<=0&&n>=this.length?this:new r(Zo(this.text,t,n),Math.min(n,this.length)-Math.max(0,t));if(o&1){let l=i.pop(),a=Nn(s.text,l.text.slice(),0,s.length);if(a.length<=32)i.push(new r(a,l.length+s.length));else{let u=a.length>>1;i.push(new r(a.slice(0,u)),new r(a.slice(u)))}}else i.push(s)}replace(t,n,i){if(!(i instanceof r))return super.replace(t,n,i);[t,n]=Ot(this,t,n);let o=Nn(this.text,Nn(i.text,Zo(this.text,0,t)),n),s=this.length+i.length-(n-t);return o.length<=32?new r(o,s):Rt.from(r.split(o,[]),s)}sliceString(t,n=this.length,i=`
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p=c.children[m],g=d+p.length;g>=f&&(p.isComposite()?u(p,f-d):(!l||l.isHidden&&(n>0||i&&tu(l,p)))&&(g>f||p.flags&32)?(l=p,a=f-d):(d<f||p.flags&16&&!p.isHidden)&&(o=p,s=f-d)),d=g}}u(this,t);let h=(n<0?o:l)||o||l;return h?{tile:h,offset:h==o?s:a}:null}coordsIn(t,n){let i=this.resolveInline(t,n,!0);return i?i.tile.coordsIn(Math.max(0,i.offset),n):eu(this)}domIn(t,n){let i=this.resolveInline(t,n);if(i){let{tile:o,offset:s}=i;if(this.dom.contains(o.dom))return o.isText()?new ue(o.dom,Math.min(o.dom.nodeValue.length,s)):o.domPosFor(s,o.flags&16?1:o.flags&32?-1:n);let l=i.tile.parent,a=!1,u;for(let h of l.children){if(a)return new ue(h.dom,0);if(h==i.tile){if(u)return new ue(u.dom,ae(u.dom));a=!0}}}return new ue(this.dom,0)}};function eu(r){let e=r.dom.lastChild;if(!e)return r.dom.getBoundingClientRect();let t=Ht(e);return t[t.length-1]||null}function tu(r,e){let t=r.coordsIn(0,1),n=e.coordsIn(0,1);return t&&n&&n.top<t.bottom}var ee=class r extends Gt{constructor(t,n){super(t);this.mark=n}get 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this.flags&48?!1:(this.flags&(t<0?64:128))>0}coordsIn(t,n){return this.coordsInWidget(t,n,!1)}coordsInWidget(t,n,i){let o=this.widget.coordsAt(this.dom,t,n);if(o)return o;if(i)return Ft(this.dom.getBoundingClientRect(),this.length?t==0:n<=0);{let s=this.dom.getClientRects(),l=null;if(!s.length)return null;let a=this.flags&16?!0:this.flags&32?!1:t>0;for(let u=a?s.length-1:0;l=s[u],!(t>0?u==0:u==s.length-1||l.top<l.bottom);u+=a?-1:1);return Ft(l,!a)}}get overrideDOMText(){if(!this.length)return A.empty;let{root:t}=this;if(!t)return A.empty;let n=this.posAtStart;return t.view.state.doc.slice(n,n+this.length)}destroy(){super.destroy(),this.widget.destroy(this.dom)}static of(t,n,i,o,s){return s||(s=t.toDOM(n),t.editable||(s.contentEditable="false")),new r(s,i,t,o)}},wt=class extends O{constructor(e){let t=document.createElement("img");t.className="cm-widgetBuffer",t.setAttribute("aria-hidden","true"),super(t,0,e)}get isHidden(){return!0}get overrideDOMText(){return A.empty}coordsIn(e){return this.dom.getBoundingClientRect()}},br=class{constructor(e){this.index=0;this.beforeBreak=!1;this.parents=[];this.tile=e}advance(e,t,n){let{tile:i,index:o,beforeBreak:s,parents:l}=this;for(;e||t>0;)if(i.isComposite())if(s){if(!e)break;n&&n.break(),e--,s=!1}else if(o==i.children.length){if(!e&&!l.length)break;n&&n.leave(i),s=!!i.breakAfter,{tile:i,index:o}=l.pop(),o++}else{let a=i.children[o],u=a.breakAfter;(t>0?a.length<=e:a.length<e)&&(!n||n.skip(a,0,a.length)!==!1||!a.isComposite)?(s=!!u,o++,e-=a.length):(l.push({tile:i,index:o}),i=a,o=0,n&&a.isComposite()&&n.enter(a))}else if(o==i.length)s=!!i.breakAfter,{tile:i,index:o}=l.pop(),o++;else if(e){let a=Math.min(e,i.length-o);n&&n.skip(i,o,o+a),e-=a,o+=a}else break;return this.tile=i,this.index=o,this.beforeBreak=s,this}get root(){return this.parents.length?this.parents[0].tile:this.tile}};var Ct=!1;var eo=class{constructor(e,t,n,i){this.from=e;this.to=t;this.wrapper=n;this.rank=i}},to=class{constructor(e,t,n){this.cache=e;this.root=t;this.blockWrappers=n;this.curLine=null;this.lastBlock=null;this.afterWidget=null;this.pos=0;this.wrappers=[];this.wrapperPos=0}addText(e,t,n,i){this.flushBuffer();let o=this.ensureMarks(t,n),s=o.lastChild;if(s&&s.isText()&&!(s.flags&8)&&s.length+e.length<512){this.cache.reused.set(s,2);let l=o.children[o.children.length-1]=new Ze(s.dom,s.text+e);l.parent=o}else o.append(i||Ze.of(e,this.cache.find(Ze)?.dom));this.pos+=e.length,this.afterWidget=null}addComposition(e,t){let n=this.curLine;n.dom!=t.line.dom&&(n.setDOM(this.cache.reused.has(t.line)?Zi(t.line.dom):t.line.dom),this.cache.reused.set(t.line,2));let i=n;for(let l=t.marks.length-1;l>=0;l--){let a=t.marks[l],u=i.lastChild;if(u instanceof ee&&u.mark.eq(a.mark))u.dom!=a.dom&&u.setDOM(Zi(a.dom)),i=u;else{if(this.cache.reused.get(a)){let c=O.get(a.dom);c&&c.setDOM(Zi(a.dom))}let h=ee.of(a.mark,a.dom);i.append(h),i=h}this.cache.reused.set(a,2)}let o=O.get(e.text);o&&this.cache.reused.set(o,2);let s=new Ze(e.text,e.text.nodeValue);s.flags|=8,i.append(s)}addInlineWidget(e,t,n){let i=this.afterWidget&&e.flags&48&&(this.afterWidget.flags&48)==(e.flags&48);i||this.flushBuffer();let o=this.ensureMarks(t,n);!i&&!(e.flags&16)&&o.append(this.getBuffer(1)),o.append(e),this.pos+=e.length,this.afterWidget=e}addMark(e,t,n){this.flushBuffer(),this.ensureMarks(t,n).append(e),this.pos+=e.length,this.afterWidget=null}addBlockWidget(e){this.getBlockPos().append(e),this.pos+=e.length,this.lastBlock=e,this.endLine()}continueWidget(e){let t=this.afterWidget||this.lastBlock;t.length+=e,this.pos+=e}addLineStart(e,t){e||(e=Vs);let n=Tt.start(e,t||this.cache.find(Tt)?.dom,!!t);this.getBlockPos().append(this.lastBlock=this.curLine=n)}addLine(e){this.getBlockPos().append(e),this.pos+=e.length,this.lastBlock=e,this.endLine()}addBreak(){this.lastBlock.flags|=1,this.endLine(),this.pos++}addLineStartIfNotCovered(e){this.blockPosCovered()||this.addLineStart(e)}ensureLine(e){this.curLine||this.addLineStart(e)}ensureMarks(e,t){let n=this.curLine;for(let i=e.length-1;i>=0;i--){let o=e[i],s;if(t>0&&(s=n.lastChild)&&s instanceof ee&&s.mark.eq(o))n=s,t--;else{let l=ee.of(o,this.cache.find(ee,a=>a.mark.eq(o))?.dom);n.append(l),n=l,t=0}}return n}endLine(){if(this.curLine){this.flushBuffer();let e=this.curLine.lastChild;(!e||!Ps(this.curLine,!1)||e.dom.nodeName!="BR"&&e.isWidget()&&!(S.ios&&Ps(this.curLine,!0)))&&this.curLine.append(this.cache.findWidget(_i,0,32)||new _e(_i.toDOM(),0,_i,32)),this.curLine=this.afterWidget=null}}updateBlockWrappers(){this.wrapperPos>this.pos+1e4&&(this.blockWrappers.goto(this.pos),this.wrappers.length=0);for(let e=this.wrappers.length-1;e>=0;e--)this.wrappers[e].to<this.pos&&this.wrappers.splice(e,1);for(let e=this.blockWrappers;e.value&&e.from<=this.pos;e.next())if(e.to>=this.pos){let t=new eo(e.from,e.to,e.value,e.rank),n=this.wrappers.length;for(;n>0&&(this.wrappers[n-1].rank-t.rank||this.wrappers[n-1].to-t.to)<0;)n--;this.wrappers.splice(n,0,t)}this.wrapperPos=this.pos}getBlockPos(){this.updateBlockWrappers();let e=this.root;for(let t of this.wrappers){let n=e.lastChild;if(t.from<this.pos&&n instanceof ve&&n.wrapper.eq(t.wrapper))e=n;else{let i=ve.of(t.wrapper,this.cache.find(ve,o=>o.wrapper.eq(t.wrapper))?.dom);e.append(i),e=i}}return e}blockPosCovered(){let e=this.lastBlock;return e!=null&&!e.breakAfter&&(!e.isWidget()||(e.flags&160)>0)}getBuffer(e){let t=2|(e<0?16:32),n=this.cache.find(wt,void 0,1);return n&&(n.flags=t),n||new wt(t)}flushBuffer(){this.afterWidget&&!(this.afterWidget.flags&32)&&(this.afterWidget.parent.append(this.getBuffer(-1)),this.afterWidget=null)}},no=class{constructor(e){this.skipCount=0;this.text="";this.textOff=0;this.cursor=e.iter()}skip(e){this.textOff+e<=this.text.length?this.textOff+=e:(this.skipCount+=e-(this.text.length-this.textOff),this.text="",this.textOff=0)}next(e){if(this.textOff==this.text.length){let{value:i,lineBreak:o,done:s}=this.cursor.next(this.skipCount);if(this.skipCount=0,s)throw new Error("Ran out of text content when drawing inline views");this.text=i;let l=this.textOff=Math.min(e,i.length);return o?null:i.slice(0,l)}let t=Math.min(this.text.length,this.textOff+e),n=this.text.slice(this.textOff,t);return this.textOff=t,n}},yr=[_e,Tt,Ze,ee,wt,ve,Qe];for(let r=0;r<yr.length;r++)yr[r].bucket=r;var ro=class{constructor(e){this.view=e;this.buckets=yr.map(()=>[]);this.index=yr.map(()=>0);this.reused=new Map}add(e){let t=e.constructor.bucket,n=this.buckets[t];n.length<6?n.push(e):n[this.index[t]=(this.index[t]+1)%6]=e}find(e,t,n=2){let i=e.bucket,o=this.buckets[i],s=this.index[i];for(let l=o.length-1;l>=0;l--){let a=(l+s)%o.length,u=o[a];if((!t||t(u))&&!this.reused.has(u))return o.splice(a,1),a<s&&this.index[i]--,this.reused.set(u,n),u}return null}findWidget(e,t,n){let i=this.buckets[0];if(i.length)for(let o=0,s=0;;o++){if(o==i.length){if(s)return null;s=1,o=0}let l=i[o];if(!this.reused.has(l)&&(s==0?l.widget.compare(e):l.widget.constructor==e.constructor&&e.updateDOM(l.dom,this.view,l.widget)))return i.splice(o,1),o<this.index[0]&&this.index[0]--,l.widget==e&&l.length==t&&(l.flags&497)==n?(this.reused.set(l,1),l):(this.reused.set(l,2),new _e(l.dom,t,e,l.flags&-498|n))}}reuse(e){return this.reused.set(e,1),e}maybeReuse(e,t=2){if(!this.reused.has(e))return this.reused.set(e,t),e.dom}clear(){for(let e=0;e<this.buckets.length;e++)this.buckets[e].length=this.index[e]=0}},xr=class{constructor(e,t,n,i,o){this.view=e;this.decorations=i;this.disallowBlockEffectsFor=o;this.openWidget=!1;this.openMarks=0;this.cache=new ro(e),this.text=new no(e.state.doc),this.builder=new to(this.cache,new Qe(e,e.contentDOM),N.iter(n)),this.cache.reused.set(t,2),this.old=new br(t),this.reuseWalker={skip:(s,l,a)=>{if(this.cache.add(s),s.isComposite())return!1},enter:s=>this.cache.add(s),leave:()=>{},break:()=>{}}}run(e,t){Ct&&console.log("Build with changes",JSON.stringify(e)),Ct&&t&&console.log("Composition=",JSON.stringify(t.range),t.text.nodeValue),Ct&&console.log("<<< "+this.old.tile);let n=t&&this.getCompositionContext(t.text);for(let i=0,o=0,s=0;;){let l=s<e.length?e[s++]:null,a=l?l.fromA:this.old.root.length;if(a>i){Ct&&console.log("Preserve",i,"to",a);let u=a-i;this.preserve(u,!s,!l),i=a,o+=u}if(!l)break;t&&l.fromA<=t.range.fromA&&l.toA>=t.range.toA?(Ct&&console.log("Emit composition",o,"to",l.toB,"over",i,"to",l.toA),this.forward(l.fromA,t.range.fromA,t.range.fromA<t.range.toA?1:-1),this.emit(o,t.range.fromB),this.cache.clear(),this.builder.addComposition(t,n),this.text.skip(t.range.toB-t.range.fromB),this.forward(t.range.fromA,l.toA),this.emit(t.range.toB,l.toB)):(Ct&&console.log("Emit",o,"to",l.toB,"over",i,"to",l.toA),this.forward(l.fromA,l.toA),this.emit(o,l.toB)),o=l.toB,i=l.toA}return Ct&&console.log(">>> "+this.builder.root),this.builder.curLine&&this.builder.endLine(),this.builder.root}preserve(e,t,n){let i=ou(this.old),o=this.openMarks;this.old.advance(e,n?1:-1,{skip:(s,l,a)=>{if(s.isWidget())if(this.openWidget)this.builder.continueWidget(a-l);else{let u=a>0||l<s.length?_e.of(s.widget,this.view,a-l,s.flags&496,this.cache.maybeReuse(s)):this.cache.reuse(s);u.flags&256?(u.flags&=-2,this.builder.addBlockWidget(u)):(this.builder.ensureLine(null),this.builder.addInlineWidget(u,i,o),o=i.length)}else if(s.isText())this.builder.ensureLine(null),!l&&a==s.length&&!this.cache.reused.has(s)?this.builder.addText(s.text,i,o,this.cache.reuse(s)):(this.cache.add(s),this.builder.addText(s.text.slice(l,a),i,o)),o=i.length;else if(s.isLine())s.flags&=-2,this.cache.reused.set(s,1),this.builder.addLine(s);else if(s instanceof wt)this.cache.add(s);else if(s instanceof ee)this.builder.ensureLine(null),this.builder.addMark(s,i,o),this.cache.reused.set(s,1),o=i.length;else return!1;this.openWidget=!1},enter:s=>{s.isLine()?this.builder.addLineStart(s.attrs,this.cache.maybeReuse(s)):(this.cache.add(s),s instanceof ee&&i.unshift(s.mark)),this.openWidget=!1},leave:s=>{s.isLine()?i.length&&(i.length=o=0):s instanceof ee&&(i.shift(),o=Math.min(o,i.length))},break:()=>{this.builder.addBreak(),this.openWidget=!1}}),this.text.skip(e)}emit(e,t){let n=null,i=this.builder,o=0,s=N.spans(this.decorations,e,t,{point:(l,a,u,h,c,f)=>{if(u instanceof We){if(this.disallowBlockEffectsFor[f]){if(u.block)throw new RangeError("Block decorations may not be specified via plugins");if(a>this.view.state.doc.lineAt(l).to)throw new RangeError("Decorations that replace line breaks may not be specified via plugins")}if(o=h.length,c>h.length)i.continueWidget(a-l);else{let m=u.widget||(u.block?Sr.block:Sr.inline),d=ru(u),p=this.cache.findWidget(m,a-l,d)||_e.of(m,this.view,a-l,d);u.block?(u.startSide>0&&i.addLineStartIfNotCovered(n),i.addBlockWidget(p)):(i.ensureLine(n),i.addInlineWidget(p,h,c))}n=null}else n=iu(n,u);a>l&&this.text.skip(a-l)},span:(l,a,u,h)=>{for(let c=l;c<a;){let f=this.text.next(Math.min(512,a-c));f==null?(i.addLineStartIfNotCovered(n),i.addBreak(),c++):(i.ensureLine(n),i.addText(f,u,c==l?h:u.length),c+=f.length),n=null}}});i.addLineStartIfNotCovered(n),this.openWidget=s>o,this.openMarks=s}forward(e,t,n=1){t-e<=10?this.old.advance(t-e,n,this.reuseWalker):(this.old.advance(5,-1,this.reuseWalker),this.old.advance(t-e-10,-1),this.old.advance(5,n,this.reuseWalker))}getCompositionContext(e){let t=[],n=null;for(let i=e.parentNode;;i=i.parentNode){let o=O.get(i);if(i==this.view.contentDOM)break;o instanceof ee?t.push(o):o?.isLine()?n=o:o instanceof ve||(i.nodeName=="DIV"&&!n&&i!=this.view.contentDOM?n=new Tt(i,Vs):n||t.push(ee.of(new Vt({tagName:i.nodeName.toLowerCase(),attributes:Cs(i)}),i)))}return{line:n,marks:t}}};function Ps(r,e){let t=n=>{for(let i of n.children)if((e?i.isText():i.length)||t(i))return!0;return!1};return t(r)}function ru(r){let e=r.isReplace?(r.startSide<0?64:0)|(r.endSide>0?128:0):r.startSide>0?32:16;return r.block&&(e|=256),e}var Vs={class:"cm-line"};function iu(r,e){let t=e.spec.attributes,n=e.spec.class;return!t&&!n||(r||(r={class:"cm-line"}),t&&Pt(t,r),n&&(r.class+=" "+n)),r}function ou(r){let e=[];for(let t=r.parents.length;t>1;t--){let n=t==r.parents.length?r.tile:r.parents[t].tile;n instanceof ee&&e.push(n.mark)}return e}function Zi(r){let e=O.get(r);return e&&e.setDOM(r.cloneNode()),r}var Sr=class r extends ke{constructor(t){super();this.tag=t}eq(t){return t.tag==this.tag}toDOM(){return document.createElement(this.tag)}updateDOM(t){return t.nodeName.toLowerCase()==this.tag}get isHidden(){return!0}static{this.inline=new r("span")}static{this.block=new r("div")}},_i=new class extends ke{toDOM(){return document.createElement("br")}get isHidden(){return!0}get editable(){return!0}};var pn=class{constructor(e){this.view=e;this.decorations=[];this.blockWrappers=[];this.dynamicDecorationMap=[!1];this.domChanged=null;this.hasComposition=null;this.editContextFormatting=V.none;this.lastCompositionAfterCursor=!1;this.minWidth=0;this.minWidthFrom=0;this.minWidthTo=0;this.impreciseAnchor=null;this.impreciseHead=null;this.forceSelection=!1;this.lastUpdate=Date.now();this.updateDeco(),this.tile=new Qe(e,e.contentDOM),this.updateInner([new he(0,0,0,e.state.doc.length)],null)}update(e){let t=e.changedRanges;this.minWidth>0&&t.length&&(t.every(({fromA:u,toA:h})=>h<this.minWidthFrom||u>this.minWidthTo)?(this.minWidthFrom=e.changes.mapPos(this.minWidthFrom,1),this.minWidthTo=e.changes.mapPos(this.minWidthTo,1)):this.minWidth=this.minWidthFrom=this.minWidthTo=0),this.updateEditContextFormatting(e);let n=-1;this.view.inputState.composing>=0&&!this.view.observer.editContext&&(this.domChanged?.newSel?n=this.domChanged.newSel.head:!fu(e.changes,this.hasComposition)&&!e.selectionSet&&(n=e.state.selection.main.head));let i=n>-1?lu(this.view,e.changes,n):null;if(this.domChanged=null,this.hasComposition){let{from:u,to:h}=this.hasComposition;t=new he(u,h,e.changes.mapPos(u,-1),e.changes.mapPos(h,1)).addToSet(t.slice())}this.hasComposition=i?{from:i.range.fromB,to:i.range.toB}:null,(S.ie||S.chrome)&&!i&&e&&e.state.doc.lines!=e.startState.doc.lines&&(this.forceSelection=!0);let o=this.decorations,s=this.blockWrappers;this.updateDeco();let l=uu(o,this.decorations,e.changes);l.length&&(t=he.extendWithRanges(t,l));let a=hu(s,this.blockWrappers,e.changes);return a.length&&(t=he.extendWithRanges(t,a)),i&&!t.some(u=>u.fromA<=i.range.fromA&&u.toA>=i.range.toA)&&(t=i.range.addToSet(t.slice())),this.tile.flags&2&&t.length==0?!1:(this.updateInner(t,i),e.transactions.length&&(this.lastUpdate=Date.now()),!0)}updateInner(e,t){this.view.viewState.mustMeasureContent=!0;let{observer:n}=this.view;n.ignore(()=>{if(t||e.length){let s=this.tile,l=new xr(this.view,s,this.blockWrappers,this.decorations,this.dynamicDecorationMap);t&&O.get(t.text)&&l.cache.reused.set(O.get(t.text),2),this.tile=l.run(e,t),io(s,l.cache.reused)}this.tile.dom.style.height=this.view.viewState.contentHeight/this.view.scaleY+"px",this.tile.dom.style.flexBasis=this.minWidth?this.minWidth+"px":"";let o=S.chrome||S.ios?{node:n.selectionRange.focusNode,written:!1}:void 0;this.tile.sync(o),o&&(o.written||n.selectionRange.focusNode!=o.node||!this.tile.dom.contains(o.node))&&(this.forceSelection=!0),this.tile.dom.style.height=""});let i=[];if(this.view.viewport.from||this.view.viewport.to<this.view.state.doc.length)for(let o of this.tile.children)o.isWidget()&&o.widget instanceof mn&&i.push(o.dom);n.updateGaps(i)}updateEditContextFormatting(e){this.editContextFormatting=this.editContextFormatting.map(e.changes);for(let t of e.transactions)for(let n of t.effects)n.is(mr)&&(this.editContextFormatting=n.value)}updateSelection(e=!1,t=!1){(e||!this.view.observer.selectionRange.focusNode)&&this.view.observer.readSelectionRange();let{dom:n}=this.tile,i=this.view.root.activeElement,o=i==n,s=!o&&!(this.view.state.facet(ce)||n.tabIndex>-1)&&Ye(n,this.view.observer.selectionRange)&&!(i&&n.contains(i));if(!(o||t||s))return;let l=this.forceSelection;this.forceSelection=!1;let a=this.view.state.selection.main,u,h;if(a.empty?h=u=this.inlineDOMNearPos(a.anchor,a.assoc||1):(h=this.inlineDOMNearPos(a.head,a.head==a.from?1:-1),u=this.inlineDOMNearPos(a.anchor,a.anchor==a.from?1:-1)),S.gecko&&a.empty&&!this.hasComposition&&su(u)){let f=document.createTextNode("");this.view.observer.ignore(()=>u.node.insertBefore(f,u.node.childNodes[u.offset]||null)),u=h=new ue(f,0),l=!0}let c=this.view.observer.selectionRange;(l||!c.focusNode||(!bt(u.node,u.offset,c.anchorNode,c.anchorOffset)||!bt(h.node,h.offset,c.focusNode,c.focusOffset))&&!this.suppressWidgetCursorChange(c,a))&&(this.view.observer.ignore(()=>{S.android&&S.chrome&&n.contains(c.focusNode)&&cu(c.focusNode,n)&&(n.blur(),n.focus({preventScroll:!0}));let f=$e(this.view.root);if(f)if(a.empty){if(S.gecko){let m=au(u.node,u.offset);if(m&&m!=3){let d=(m==1?Vi:Hi)(u.node,u.offset);d&&(u=new ue(d.node,d.offset))}}f.collapse(u.node,u.offset),a.bidiLevel!=null&&f.caretBidiLevel!==void 0&&(f.caretBidiLevel=a.bidiLevel)}else if(f.extend){f.collapse(u.node,u.offset);try{f.extend(h.node,h.offset)}catch{}}else{let m=document.createRange();a.anchor>a.head&&([u,h]=[h,u]),m.setEnd(h.node,h.offset),m.setStart(u.node,u.offset),f.removeAllRanges(),f.addRange(m)}s&&this.view.root.activeElement==n&&(n.blur(),i&&i.focus())}),this.view.observer.setSelectionRange(u,h)),this.impreciseAnchor=u.precise?null:new ue(c.anchorNode,c.anchorOffset),this.impreciseHead=h.precise?null:new ue(c.focusNode,c.focusOffset)}suppressWidgetCursorChange(e,t){return this.hasComposition&&t.empty&&bt(e.focusNode,e.focusOffset,e.anchorNode,e.anchorOffset)&&this.posFromDOM(e.focusNode,e.focusOffset)==t.head}enforceCursorAssoc(){if(this.hasComposition)return;let{view:e}=this,t=e.state.selection.main,n=$e(e.root),{anchorNode:i,anchorOffset:o}=e.observer.selectionRange;if(!n||!t.empty||!t.assoc||!n.modify)return;let s=this.lineAt(t.head,t.assoc);if(!s)return;let l=s.posAtStart;if(t.head==l||t.head==l+s.length)return;let a=this.coordsAt(t.head,-1),u=this.coordsAt(t.head,1);if(!a||!u||a.bottom>u.top)return;let h=this.domAtPos(t.head+t.assoc,t.assoc);n.collapse(h.node,h.offset),n.modify("move",t.assoc<0?"forward":"backward","lineboundary"),e.observer.readSelectionRange();let c=e.observer.selectionRange;e.docView.posFromDOM(c.anchorNode,c.anchorOffset)!=t.from&&n.collapse(i,o)}posFromDOM(e,t){let n=this.tile.nearest(e);if(!n)return this.tile.dom.compareDocumentPosition(e)&2?0:this.view.state.doc.length;let i=n.posAtStart;if(n.isComposite()){let o;if(e==n.dom)o=n.dom.childNodes[t];else{let s=ae(e)==0?0:t==0?-1:1;for(;;){let l=e.parentNode;if(l==n.dom)break;s==0&&l.firstChild!=l.lastChild&&(e==l.firstChild?s=-1:s=1),e=l}s<0?o=e:o=e.nextSibling}if(o==n.dom.firstChild)return i;for(;o&&!O.get(o);)o=o.nextSibling;if(!o)return i+n.length;for(let s=0,l=i;;s++){let a=n.children[s];if(a.dom==o)return l;l+=a.length+a.breakAfter}}else return n.isText()?e==n.dom?i+t:i+(t?n.length:0):i}domAtPos(e,t){let{tile:n,offset:i}=this.tile.resolveBlock(e,t);return n.isWidget()?n.domPosFor(e,t):n.domIn(i,t)}inlineDOMNearPos(e,t){let n,i=-1,o=!1,s,l=-1,a=!1;return this.tile.blockTiles((u,h)=>{if(u.isWidget()){if(u.flags&32&&h>=e)return!0;u.flags&16&&(o=!0)}else{let c=h+u.length;if(h<=e&&(n=u,i=e-h,o=c<e),c>=e&&!s&&(s=u,l=e-h,a=h>e),h>e&&s)return!0}}),!n&&!s?this.domAtPos(e,t):(o&&s?n=null:a&&n&&(s=null),n&&t<0||!s?n.domIn(i,t):s.domIn(l,t))}coordsAt(e,t){let{tile:n,offset:i}=this.tile.resolveBlock(e,t);return n.isWidget()?n.widget instanceof mn?null:n.coordsInWidget(i,t,!0):n.coordsIn(i,t)}lineAt(e,t){let{tile:n}=this.tile.resolveBlock(e,t);return n.isLine()?n:null}coordsForChar(e){let{tile:t,offset:n}=this.tile.resolveBlock(e,1);if(!t.isLine())return null;function i(o,s){if(o.isComposite())for(let l of o.children){if(l.length>=s){let a=i(l,s);if(a)return a}if(s-=l.length,s<0)break}else if(o.isText()&&s<o.length){let l=z(o.text,s);if(l==s)return null;let a=Xe(o.dom,s,l).getClientRects();for(let u=0;u<a.length;u++){let h=a[u];if(u==a.length-1||h.top<h.bottom&&h.left<h.right)return h}}return null}return i(t,n)}measureVisibleLineHeights(e){let t=[],{from:n,to:i}=e,o=this.view.contentDOM.clientWidth,s=o>Math.max(this.view.scrollDOM.clientWidth,this.minWidth)+1,l=-1,a=this.view.textDirection==0,u=0,h=(c,f,m)=>{for(let d=0;d<c.children.length&&!(f>i);d++){let p=c.children[d],g=f+p.length,b=p.dom.getBoundingClientRect(),{height:C}=b;if(m&&!d&&(u+=b.top-m.top),p instanceof ve)g>n&&h(p,f,b);else if(f>=n&&(u>0&&t.push(-u),t.push(C+u),u=0,s)){let v=p.dom.lastChild,M=v?Ht(v):[];if(M.length){let w=M[M.length-1],x=a?w.right-b.left:b.right-w.left;x>l&&(l=x,this.minWidth=o,this.minWidthFrom=f,this.minWidthTo=g)}}m&&d==c.children.length-1&&(u+=m.bottom-b.bottom),f=g+p.breakAfter}};return h(this.tile,0,null),t}textDirectionAt(e){let{tile:t}=this.tile.resolveBlock(e,1);return getComputedStyle(t.dom).direction=="rtl"?1:0}measureTextSize(){let e=this.tile.blockTiles(s=>{if(s.isLine()&&s.children.length&&s.length<=20){let l=0,a;for(let u of s.children){if(!u.isText()||/[^ -~]/.test(u.text))return;let h=Ht(u.dom);if(h.length!=1)return;l+=h[0].width,a=h[0].height}if(l)return{lineHeight:s.dom.getBoundingClientRect().height,charWidth:l/s.length,textHeight:a}}});if(e)return e;let t=document.createElement("div"),n,i,o;return t.className="cm-line",t.style.width="99999px",t.style.position="absolute",t.textContent="abc def ghi jkl mno pqr stu",this.view.observer.ignore(()=>{this.tile.dom.appendChild(t);let s=Ht(t.firstChild)[0];n=t.getBoundingClientRect().height,i=s&&s.width?s.width/27:7,o=s&&s.height?s.height:n,t.remove()}),{lineHeight:n,charWidth:i,textHeight:o}}computeBlockGapDeco(){let e=[],t=this.view.viewState;for(let n=0,i=0;;i++){let o=i==t.viewports.length?null:t.viewports[i],s=o?o.from-1:this.view.state.doc.length;if(s>n){let l=(t.lineBlockAt(s).bottom-t.lineBlockAt(n).top)/this.view.scaleY;e.push(V.replace({widget:new mn(l),block:!0,inclusive:!0,isBlockGap:!0}).range(n,s))}if(!o)break;n=o.to+1}return V.set(e)}updateDeco(){let e=1,t=this.view.state.facet(St).map(o=>(this.dynamicDecorationMap[e++]=typeof o=="function")?o(this.view):o),n=!1,i=this.view.state.facet(Ut).map((o,s)=>{let l=typeof o=="function";return l&&(n=!0),l?o(this.view):o});for(i.length&&(this.dynamicDecorationMap[e++]=n,t.push(N.join(i))),this.decorations=[this.editContextFormatting,...t,this.computeBlockGapDeco(),this.view.viewState.lineGapDeco];e<this.decorations.length;)this.dynamicDecorationMap[e++]=!1;this.blockWrappers=this.view.state.facet(pr).map(o=>typeof o=="function"?o(this.view):o)}scrollIntoView(e){if(e.isSnapshot){let u=this.view.viewState.lineBlockAt(e.range.head);this.view.scrollDOM.scrollTop=u.top-e.yMargin,this.view.scrollDOM.scrollLeft=e.xMargin;return}for(let u of this.view.state.facet(dr))try{if(u(this.view,e.range,e))return!0}catch(h){_(this.view.state,h,"scroll handler")}let{range:t}=e,n=this.coordsAt(t.head,t.assoc??(t.empty?0:t.head>t.anchor?-1:1)),i;if(!n)return;!t.empty&&(i=this.coordsAt(t.anchor,t.anchor>t.head?-1:1))&&(n={left:Math.min(n.left,i.left),top:Math.min(n.top,i.top),right:Math.max(n.right,i.right),bottom:Math.max(n.bottom,i.bottom)});let o=gr(this.view),s={left:n.left-o.left,top:n.top-o.top,right:n.right+o.right,bottom:n.bottom+o.bottom},{offsetWidth:l,offsetHeight:a}=this.view.scrollDOM;if(Es(this.view.scrollDOM,s,t.head<t.anchor?-1:1,e.x,e.y,Math.max(Math.min(e.xMargin,l),-l),Math.max(Math.min(e.yMargin,a),-a),this.view.textDirection==0),window.visualViewport&&window.innerHeight-window.visualViewport.height>1&&(n.top>window.pageYOffset+window.visualViewport.offsetTop+window.visualViewport.height||n.bottom<window.pageYOffset+window.visualViewport.offsetTop)){let u=this.view.docView.lineAt(t.head,1);u&&u.dom.scrollIntoView({block:"nearest"})}}lineHasWidget(e){let t=n=>n.isWidget()||n.children.some(t);return t(this.tile.resolveBlock(e,1).tile)}destroy(){io(this.tile)}};function io(r,e){let t=e?.get(r);if(t!=1){t==null&&r.destroy();for(let n of r.children)io(n,e)}}function su(r){return r.node.nodeType==1&&r.node.firstChild&&(r.offset==0||r.node.childNodes[r.offset-1].contentEditable=="false")&&(r.offset==r.node.childNodes.length||r.node.childNodes[r.offset].contentEditable=="false")}function lo(r,e){let t=r.observer.selectionRange;if(!t.focusNode)return null;let n=Vi(t.focusNode,t.focusOffset),i=Hi(t.focusNode,t.focusOffset),o=n||i;if(i&&n&&i.node!=n.node){let l=O.get(i.node);if(!l||l.isText()&&l.text!=i.node.nodeValue)o=i;else if(r.docView.lastCompositionAfterCursor){let a=O.get(n.node);!a||a.isText()&&a.text!=n.node.nodeValue||(o=i)}}if(r.docView.lastCompositionAfterCursor=o!=n,!o)return null;let s=e-o.offset;return{from:s,to:s+o.node.nodeValue.length,node:o.node}}function lu(r,e,t){let n=lo(r,t);if(!n)return null;let{node:i,from:o,to:s}=n,l=i.nodeValue;if(/[\n\r]/.test(l)||r.state.doc.sliceString(n.from,n.to)!=l)return null;let a=e.invertedDesc;return{range:new he(a.mapPos(o),a.mapPos(s),o,s),text:i}}function au(r,e){return r.nodeType!=1?0:(e&&r.childNodes[e-1].contentEditable=="false"?1:0)|(e<r.childNodes.length&&r.childNodes[e].contentEditable=="false"?2:0)}var oo=class{constructor(){this.changes=[]}compareRange(e,t){Je(e,t,this.changes)}comparePoint(e,t){Je(e,t,this.changes)}boundChange(e){Je(e,e,this.changes)}};function uu(r,e,t){let n=new oo;return N.compare(r,e,t,n),n.changes}var so=class{constructor(){this.changes=[]}compareRange(e,t){Je(e,t,this.changes)}comparePoint(){}boundChange(e){Je(e,e,this.changes)}};function hu(r,e,t){let n=new so;return N.compare(r,e,t,n),n.changes}function cu(r,e){for(let t=r;t&&t!=e;t=t.assignedSlot||t.parentNode)if(t.nodeType==1&&t.contentEditable=="false")return!0;return!1}function fu(r,e){let t=!1;return e&&r.iterChangedRanges((n,i)=>{n<e.to&&i>e.from&&(t=!0)}),t}var mn=class extends ke{constructor(t){super();this.height=t}toDOM(){let t=document.createElement("div");return t.className="cm-gap",this.updateDOM(t),t}eq(t){return t.height==this.height}updateDOM(t){return t.style.height=this.height+"px",!0}get editable(){return!0}get estimatedHeight(){return this.height}ignoreEvent(){return!1}};function Fs(r,e,t=1){let n=r.charCategorizer(e),i=r.doc.lineAt(e),o=e-i.from;if(i.length==0)return y.cursor(e);o==0?t=1:o==i.length&&(t=-1);let s=o,l=o;t<0?s=z(i.text,o,!1):l=z(i.text,o);let a=n(i.text.slice(s,l));for(;s>0;){let u=z(i.text,s,!1);if(n(i.text.slice(u,s))!=a)break;s=u}for(;l<i.length;){let u=z(i.text,l);if(n(i.text.slice(l,u))!=a)break;l=u}return y.range(s+i.from,l+i.from)}function du(r,e,t,n,i){let o=Math.round((n-e.left)*r.defaultCharacterWidth);if(r.lineWrapping&&t.height>r.defaultLineHeight*1.5){let l=r.viewState.heightOracle.textHeight,a=Math.floor((i-t.top-(r.defaultLineHeight-l)*.5)/l);o+=a*r.viewState.heightOracle.lineLength}let s=r.state.sliceDoc(t.from,t.to);return t.from+Ei(s,o,r.state.tabSize)}function Tr(r,e,t){let n=r.lineBlockAt(e);if(Array.isArray(n.type)){let i;for(let o of n.type){if(o.from>e)break;if(!(o.to<e)){if(o.from<e&&o.to>e)return o;(!i||o.type==0&&(i.type!=o.type||(t<0?o.from<e:o.to>e)))&&(i=o)}}return i||n}return n}function Ws(r,e,t,n){let i=Tr(r,e.head,e.assoc||-1),o=!n||i.type!=0||!(r.lineWrapping||i.widgetLineBreaks)?null:r.coordsAtPos(e.assoc<0&&e.head>i.from?e.head-1:e.head);if(o){let s=r.dom.getBoundingClientRect(),l=r.textDirectionAt(i.from),a=r.posAtCoords({x:t==(l==0)?s.right-1:s.left+1,y:(o.top+o.bottom)/2});if(a!=null)return y.cursor(a,t?-1:1)}return y.cursor(t?i.to:i.from,t?-1:1)}function uo(r,e,t,n){let i=r.state.doc.lineAt(e.head),o=r.bidiSpans(i),s=r.textDirectionAt(i.from);for(let l=e,a=null;;){let u=Ls(i,o,s,l,t),h=Gi;if(!u){if(i.number==(t?r.state.doc.lines:1))return l;h=`
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n=0;for(let i of r)i.between(e-1,e+1,(o,s,l)=>{if(e>o&&e<s){let a=n||t||(e-o<s-e?-1:1);e=a<0?o:s,n=a}});if(!n)return e}}function wr(r,e){let t=null;for(let n=0;n<e.ranges.length;n++){let i=e.ranges[n],o=null;if(i.empty){let s=jt(r,i.from,0);s!=i.from&&(o=y.cursor(s,-1))}else{let s=jt(r,i.from,-1),l=jt(r,i.to,1);(s!=i.from||l!=i.to)&&(o=y.range(i.from==i.anchor?s:l,i.from==i.head?s:l))}o&&(t||(t=e.ranges.slice()),t[n]=o)}return t?y.create(t,e.mainIndex):e}function Cr(r,e,t){let n=jt(r.state.facet(ze).map(i=>i(r)),t.from,e.head>t.from?-1:1);return n==t.from?t:y.cursor(n,n<t.from?1:-1)}var be=class{constructor(e,t){this.pos=e;this.assoc=t}};function kr(r,e,t,n){let i=r.contentDOM.getBoundingClientRect(),o=i.top+r.viewState.paddingTop,{x:s,y:l}=e,a=l-o,u;for(;;){if(a<0)return new be(0,1);if(a>r.viewState.docHeight)return new be(r.state.doc.length,-1);if(u=r.elementAtHeight(a),n==null)break;if(u.type==0){if(n<0?u.to<r.viewport.from:u.from>r.viewport.to)break;let 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kt="\uFFFF",vr=class{constructor(e,t){this.points=e;this.view=t;this.text="";this.lineSeparator=t.state.facet(j.lineSeparator)}append(e){this.text+=e}lineBreak(){this.text+=kt}readRange(e,t){if(!e)return this;let n=e.parentNode;for(let i=e;;){this.findPointBefore(n,i);let o=this.text.length;this.readNode(i);let s=O.get(i),l=i.nextSibling;if(l==t){s?.breakAfter&&!l&&n!=this.view.contentDOM&&this.lineBreak();break}let a=O.get(l);(s&&a?s.breakAfter:(s?s.breakAfter:un(i))||un(l)&&(i.nodeName!="BR"||s?.isWidget())&&this.text.length>o)&&!pu(l,t)&&this.lineBreak(),i=l}return this.findPointBefore(n,t),this}readTextNode(e){let t=e.nodeValue;for(let n of this.points)n.node==e&&(n.pos=this.text.length+Math.min(n.offset,t.length));for(let n=0,i=this.lineSeparator?null:/\r\n?|\n/g;;){let 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t;for(;!(r==e||!r);r=r.nextSibling){let n=O.get(r);if(!n?.isWidget())return!1;n&&(t||(t=[])).push(n)}if(t){for(let n of t)if(n.overrideDOMText?.length)return!1}return!0}var gn=class{constructor(e,t){this.node=e;this.offset=t;this.pos=-1}};var Mr=class{constructor(e,t,n,i){this.typeOver=i;this.bounds=null;this.text="";this.domChanged=t>-1;let{impreciseHead:o,impreciseAnchor:s}=e.docView,l=e.state.selection;if(e.state.readOnly&&t>-1)this.newSel=null;else if(t>-1&&(this.bounds=Us(e.docView.tile,t,n,0))){let a=o||s?[]:bu(e),u=new vr(a,e);u.readRange(this.bounds.startDOM,this.bounds.endDOM),this.text=u.text,this.newSel=yu(a,this.bounds.from)}else{let a=e.observer.selectionRange,u=o&&o.node==a.focusNode&&o.offset==a.focusOffset||!nr(e.contentDOM,a.focusNode)?l.main.head:e.docView.posFromDOM(a.focusNode,a.focusOffset),h=s&&s.node==a.anchorNode&&s.offset==a.anchorOffset||!nr(e.contentDOM,a.anchorNode)?l.main.anchor:e.docView.posFromDOM(a.anchorNode,a.anchorOffset),c=e.viewport;if((S.ios||S.chrome)&&l.main.empty&&u!=h&&(c.from>0||c.to<e.state.doc.length)){let f=Math.min(u,h),m=Math.max(u,h),d=c.from-f,p=c.to-m;(d==0||d==1||f==0)&&(p==0||p==-1||m==e.state.doc.length)&&(u=0,h=e.state.doc.length)}if(e.inputState.composing>-1&&l.ranges.length>1)this.newSel=l.replaceRange(y.range(h,u));else if(e.lineWrapping&&h==u&&!(l.main.empty&&l.main.head==u)&&e.inputState.lastTouchTime>Date.now()-100){let f=e.coordsAtPos(u,-1),m=0;f&&(m=e.inputState.lastTouchY<=f.bottom?-1:1),this.newSel=y.create([y.cursor(u,m)])}else this.newSel=y.single(h,u)}}};function Us(r,e,t,n){if(r.isComposite()){let i=-1,o=-1,s=-1,l=-1;for(let a=0,u=n,h=n;a<r.children.length;a++){let c=r.children[a],f=u+c.length;if(u<e&&f>t)return Us(c,e,t,u);if(f>=e&&i==-1&&(i=a,o=u),u>t&&c.dom.parentNode==r.dom){s=a,l=h;break}h=f,u=f+c.breakAfter}return{from:o,to:l<0?n+r.length:l,startDOM:(i?r.children[i-1].dom.nextSibling:null)||r.dom.firstChild,endDOM:s<r.children.length&&s>=0?r.children[s].dom:null}}else return r.isText()?{from:n,to:n+r.length,startDOM:r.dom,endDOM:r.dom.nextSibling}:null}function Er(r,e){let t,{newSel:n}=e,{state:i}=r,o=i.selection.main,s=r.inputState.lastKeyTime>Date.now()-100?r.inputState.lastKeyCode:-1;if(e.bounds){let{from:l,to:a}=e.bounds,u=o.from,h=null;(s===8||S.android&&e.text.length<a-l)&&(u=o.to,h="end");let c=i.doc.sliceString(l,a,kt),f,m;!o.empty&&o.from>=l&&o.to<=a&&(e.typeOver||c!=e.text)&&c.slice(0,o.from-l)==e.text.slice(0,o.from-l)&&c.slice(o.to-l)==e.text.slice(f=e.text.length-(c.length-(o.to-l)))?t={from:o.from,to:o.to,insert:A.of(e.text.slice(o.from-l,f).split(kt))}:(m=ho(c,e.text,u-l,h))&&(S.chrome&&s==13&&m.toB==m.from+2&&e.text.slice(m.from,m.toB)==kt+kt&&m.toB--,t={from:l+m.from,to:l+m.toA,insert:A.of(e.text.slice(m.from,m.toB).split(kt))})}else n&&(!r.hasFocus&&i.facet(ce)||bn(n,o))&&(n=null);if(!t&&!n)return!1;if((S.mac||S.android)&&t&&t.from==t.to&&t.from==o.head-1&&/^\. ?$/.test(t.insert.toString())&&r.contentDOM.getAttribute("autocorrect")=="off"?(n&&t.insert.length==2&&(n=y.single(n.main.anchor-1,n.main.head-1)),t={from:t.from,to:t.to,insert:A.of([t.insert.toString().replace("."," 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+ `&&r.lineWrapping&&(n&&(n=y.single(n.main.anchor-1,n.main.head-1)),t={from:o.from,to:o.to,insert:A.of([" "])}),t)return yn(r,t,n,s);if(n&&!bn(n,o)){let l=!1,a="select";return r.inputState.lastSelectionTime>Date.now()-50&&(r.inputState.lastSelectionOrigin=="select"&&(l=!0),a=r.inputState.lastSelectionOrigin,a=="select.pointer"&&(n=wr(i.facet(ze).map(u=>u(r)),n))),r.dispatch({selection:n,scrollIntoView:l,userEvent:a}),!0}else return!1}function yn(r,e,t,n=-1){if(S.ios&&r.inputState.flushIOSKey(e))return!0;let i=r.state.selection.main;if(S.android&&(e.to==i.to&&(e.from==i.from||e.from==i.from-1&&r.state.sliceDoc(e.from,i.from)==" ")&&e.insert.length==1&&e.insert.lines==2&&He(r.contentDOM,"Enter",13)||(e.from==i.from-1&&e.to==i.to&&e.insert.length==0||n==8&&e.insert.length<e.to-e.from&&e.to>i.head)&&He(r.contentDOM,"Backspace",8)||e.from==i.from&&e.to==i.to+1&&e.insert.length==0&&He(r.contentDOM,"Delete",46)))return!0;let o=e.insert.toString();r.inputState.composing>=0&&r.inputState.composing++;let s,l=()=>s||(s=gu(r,e,t));return r.state.facet(hr).some(a=>a(r,e.from,e.to,o,l))||r.dispatch(l()),!0}function gu(r,e,t){let n,i=r.state,o=i.selection.main,s=-1;if(e.from==e.to&&e.from<o.from||e.from>o.to){let a=e.from<o.from?-1:1,u=a<0?o.from:o.to,h=jt(i.facet(ze).map(c=>c(r)),u,a);e.from==h&&(s=h)}if(s>-1)n={changes:e,selection:y.cursor(e.from+e.insert.length,-1)};else if(e.from>=o.from&&e.to<=o.to&&e.to-e.from>=(o.to-o.from)/3&&(!t||t.main.empty&&t.main.from==e.from+e.insert.length)&&r.inputState.composing<0){let a=o.from<e.from?i.sliceDoc(o.from,e.from):"",u=o.to>e.to?i.sliceDoc(e.to,o.to):"";n=i.replaceSelection(r.state.toText(a+e.insert.sliceString(0,void 0,r.state.lineBreak)+u))}else{let a=i.changes(e),u=t&&t.main.to<=a.newLength?t.main:void 0;if(i.selection.ranges.length>1&&(r.inputState.composing>=0||r.inputState.compositionPendingChange)&&e.to<=o.to+10&&e.to>=o.to-10){let h=r.state.sliceDoc(e.from,e.to),c,f=t&&lo(r,t.main.head);if(f){let d=e.insert.length-(e.to-e.from);c={from:f.from,to:f.to-d}}else c=r.state.doc.lineAt(o.head);let m=o.to-e.to;n=i.changeByRange(d=>{if(d.from==o.from&&d.to==o.to)return{changes:a,range:u||d.map(a)};let p=d.to-m,g=p-h.length;if(r.state.sliceDoc(g,p)!=h||p>=c.from&&g<=c.to)return{range:d};let b=i.changes({from:g,to:p,insert:e.insert}),C=d.to-o.to;return{changes:b,range:u?y.range(Math.max(0,u.anchor+C),Math.max(0,u.head+C)):d.map(b)}})}else n={changes:a,selection:u&&i.selection.replaceRange(u)}}let l="input.type";return(r.composing||r.inputState.compositionPendingChange&&r.inputState.compositionEndedAt>Date.now()-50)&&(r.inputState.compositionPendingChange=!1,l+=".compose",r.inputState.compositionFirstChange&&(l+=".start",r.inputState.compositionFirstChange=!1)),i.update(n,{userEvent:l,scrollIntoView:!0})}function ho(r,e,t,n){let i=Math.min(r.length,e.length),o=0;for(;o<i&&r.charCodeAt(o)==e.charCodeAt(o);)o++;if(o==i&&r.length==e.length)return null;let s=r.length,l=e.length;for(;s>0&&l>0&&r.charCodeAt(s-1)==e.charCodeAt(l-1);)s--,l--;if(n=="end"){let a=Math.max(0,o-Math.min(s,l));t-=s+a-o}if(s<o&&r.length<e.length){let a=t<=o&&t>=s?o-t:0;o-=a,l=o+(l-s),s=o}else if(l<o){let a=t<=o&&t>=l?o-t:0;o-=a,s=o+(s-l),l=o}return{from:o,toA:s,toB:l}}function bu(r){let e=[];if(r.root.activeElement!=r.contentDOM)return e;let{anchorNode:t,anchorOffset:n,focusNode:i,focusOffset:o}=r.observer.selectionRange;return t&&(e.push(new gn(t,n)),(i!=t||o!=n)&&e.push(new gn(i,o))),e}function yu(r,e){if(r.length==0)return null;let t=r[0].pos,n=r.length==2?r[1].pos:t;return t>-1&&n>-1?y.single(t+e,n+e):null}function bn(r,e){return e.head==r.main.head&&e.anchor==r.main.anchor}var Br=class{constructor(e){this.view=e;this.lastKeyCode=0;this.lastKeyTime=0;this.lastTouchTime=0;this.lastTouchX=0;this.lastTouchY=0;this.lastFocusTime=0;this.lastScrollTop=0;this.lastScrollLeft=0;this.lastWheelEvent=0;this.pendingIOSKey=void 0;this.tabFocusMode=-1;this.lastSelectionOrigin=null;this.lastSelectionTime=0;this.lastContextMenu=0;this.scrollHandlers=[];this.handlers=Object.create(null);this.composing=-1;this.compositionFirstChange=null;this.compositionEndedAt=0;this.compositionPendingKey=!1;this.compositionPendingChange=!1;this.insertingText="";this.insertingTextAt=0;this.mouseSelection=null;this.draggedContent=null;this.handleEvent=this.handleEvent.bind(this),this.notifiedFocused=e.hasFocus,S.safari&&e.contentDOM.addEventListener("input",()=>null),S.gecko&&Ou(e.contentDOM.ownerDocument)}setSelectionOrigin(e){this.lastSelectionOrigin=e,this.lastSelectionTime=Date.now()}handleEvent(e){!vu(this.view,e)||this.ignoreDuringComposition(e)||e.type=="keydown"&&this.keydown(e)||(this.view.updateState!=0?Promise.resolve().then(()=>this.runHandlers(e.type,e)):this.runHandlers(e.type,e))}runHandlers(e,t){let n=this.handlers[e];if(n){for(let i of n.observers)i(this.view,t);for(let i of 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S.ios&&!e.synthetic&&!e.altKey&&!e.metaKey&&!e.shiftKey&&((t=Qs.find(n=>n.keyCode==e.keyCode))&&!e.ctrlKey||Su.indexOf(e.key)>-1&&e.ctrlKey)?(this.pendingIOSKey=t||e,setTimeout(()=>this.flushIOSKey(),250),!0):(e.keyCode!=229&&this.view.observer.forceFlush(),!1)}flushIOSKey(e){let t=this.pendingIOSKey;return!t||t.key=="Enter"&&e&&e.from<e.to&&/^\S+$/.test(e.insert.toString())?!1:(this.pendingIOSKey=void 0,He(this.view.contentDOM,t.key,t.keyCode,t instanceof KeyboardEvent?t:void 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this.spaceAbove?this.blockAt(0,i,o,s).join(l):l}forEachLine(t,n,i,o,s,l){t<=s+this.length&&n>=s&&l(this.lineAt(0,0,i,o,s))}setMeasuredHeight(t){let n=t.heights[t.index++];n<0?(this.spaceAbove=-n,n=t.heights[t.index++]):this.spaceAbove=0,this.setHeight(n)}updateHeight(t,n=0,i=!1,o){return o&&o.from<=n&&o.more&&this.setMeasuredHeight(o),this.outdated=!1,this}toString(){return`block(${this.length})`}},ye=class r extends Pr{constructor(t,n,i){super(t,n,null);this.collapsed=0;this.widgetHeight=0;this.breaks=0;this.spaceAbove=i}mainBlock(t,n){return new xe(n,this.length,t+this.spaceAbove,this.height-this.spaceAbove,this.breaks)}replace(t,n,i){let o=i[0];return i.length==1&&(o instanceof r||o instanceof et&&o.flags&4)&&Math.abs(this.length-o.length)<10?(o instanceof et?o=new r(o.length,this.height,this.spaceAbove):o.height=this.height,this.outdated||(o.outdated=!1),o):re.of(i)}updateHeight(t,n=0,i=!1,o){return o&&o.from<=n&&o.more?this.setMeasuredHeight(o):(i||this.outdated)&&(this.spaceAbove=0,this.setHeight(Math.max(this.widgetHeight,t.heightForLine(this.length-this.collapsed))+this.breaks*t.lineHeight)),this.outdated=!1,this}toString(){return`line(${this.length}${this.collapsed?-this.collapsed:""}${this.widgetHeight?":"+this.widgetHeight:""})`}},et=class r extends re{constructor(e){super(e,0)}heightMetrics(e,t){let n=e.doc.lineAt(t).number,i=e.doc.lineAt(t+this.length).number,o=i-n+1,s,l=0;if(e.lineWrapping){let a=Math.min(this.height,e.lineHeight*o);s=a/o,this.length>o+1&&(l=(this.height-a)/(this.length-o-1))}else s=this.height/o;return{firstLine:n,lastLine:i,perLine:s,perChar:l}}blockAt(e,t,n,i){let{firstLine:o,lastLine:s,perLine:l,perChar:a}=this.heightMetrics(t,i);if(t.lineWrapping){let u=i+(e<t.lineHeight?0:Math.round(Math.max(0,Math.min(1,(e-n)/this.height))*this.length)),h=t.doc.lineAt(u),c=l+h.length*a,f=Math.max(n,e-c/2);return new xe(h.from,h.length,f,c,0)}else{let u=Math.max(0,Math.min(s-o,Math.floor((e-n)/l))),{from:h,length:c}=t.doc.line(o+u);return new xe(h,c,n+l*u,l,0)}}lineAt(e,t,n,i,o){if(t==1)return this.blockAt(e,n,i,o);if(t==2){let{from:m,to:d}=n.doc.lineAt(e);return new xe(m,d-m,0,0,0)}let{firstLine:s,perLine:l,perChar:a}=this.heightMetrics(n,o),u=n.doc.lineAt(e),h=l+u.length*a,c=u.number-s,f=i+l*c+a*(u.from-o-c);return new xe(u.from,u.length,Math.max(i,Math.min(f,i+this.height-h)),h,0)}forEachLine(e,t,n,i,o,s){e=Math.max(e,o),t=Math.min(t,o+this.length);let{firstLine:l,perLine:a,perChar:u}=this.heightMetrics(n,o);for(let h=e,c=i;h<=t;){let f=n.doc.lineAt(h);if(h==e){let d=f.number-l;c+=a*d+u*(e-o-d)}let m=a+u*f.length;s(new xe(f.from,f.length,c,m,0)),c+=m,h=f.to+1}}replace(e,t,n){let i=this.length-t;if(i>0){let o=n[n.length-1];o instanceof r?n[n.length-1]=new r(o.length+i):n.push(null,new r(i-1))}if(e>0){let o=n[0];o instanceof r?n[0]=new r(e+o.length):n.unshift(new r(e-1),null)}return re.of(n)}decomposeLeft(e,t){t.push(new r(e-1),null)}decomposeRight(e,t){t.push(null,new r(this.length-e-1))}updateHeight(e,t=0,n=!1,i){let o=t+this.length;if(i&&i.from<=t+this.length&&i.more){let s=[],l=Math.max(t,i.from),a=-1;for(i.from>t&&s.push(new r(i.from-t-1).updateHeight(e,t));l<=o&&i.more;){let h=e.doc.lineAt(l).length;s.length&&s.push(null);let c=i.heights[i.index++],f=0;c<0&&(f=-c,c=i.heights[i.index++]),a==-1?a=c:Math.abs(c-a)>=Or&&(a=-2);let m=new ye(h,c,f);m.outdated=!1,s.push(m),l+=h+1}l<=o&&s.push(null,new r(o-l).updateHeight(e,l));let u=re.of(s);return(a<0||Math.abs(u.height-this.height)>=Or||Math.abs(a-this.heightMetrics(e,t).perLine)>=Or)&&(vt=!0),Nr(this,u)}else(n||this.outdated)&&(this.setHeight(e.heightForGap(t,t+this.length)),this.outdated=!1);return this}toString(){return`gap(${this.length})`}},bo=class extends re{constructor(t,n,i){super(t.length+n+i.length,t.height+i.height,n|(t.outdated||i.outdated?2:0));this.left=t;this.right=i;this.size=t.size+i.size}get break(){return this.flags&1}blockAt(t,n,i,o){let s=i+this.left.height;return t<s?this.left.blockAt(t,n,i,o):this.right.blockAt(t,n,s,o+this.left.length+this.break)}lineAt(t,n,i,o,s){let l=o+this.left.height,a=s+this.left.length+this.break,u=n==1?t<l:t<a,h=u?this.left.lineAt(t,n,i,o,s):this.right.lineAt(t,n,i,l,a);if(this.break||(u?h.to<a:h.from>a))return h;let c=n==2?2:0;return u?h.join(this.right.lineAt(a,c,i,l,a)):this.left.lineAt(a,c,i,o,s).join(h)}forEachLine(t,n,i,o,s,l){let a=o+this.left.height,u=s+this.left.length+this.break;if(this.break)t<u&&this.left.forEachLine(t,n,i,o,s,l),n>=u&&this.right.forEachLine(t,n,i,a,u,l);else{let h=this.lineAt(u,0,i,o,s);t<h.from&&this.left.forEachLine(t,h.from-1,i,o,s,l),h.to>=t&&h.from<=n&&l(h),n>h.to&&this.right.forEachLine(h.to+1,n,i,a,u,l)}}replace(t,n,i){let o=this.left.length+this.break;if(n<o)return this.balanced(this.left.replace(t,n,i),this.right);if(t>this.left.length)return this.balanced(this.left,this.right.replace(t-o,n-o,i));let s=[];t>0&&this.decomposeLeft(t,s);let l=s.length;for(let a of i)s.push(a);if(t>0&&rl(s,l-1),n<this.length){let a=s.length;this.decomposeRight(n,s),rl(s,a)}return re.of(s)}decomposeLeft(t,n){let i=this.left.length;if(t<=i)return this.left.decomposeLeft(t,n);n.push(this.left),this.break&&(i++,t>=i&&n.push(null)),t>i&&this.right.decomposeLeft(t-i,n)}decomposeRight(t,n){let i=this.left.length,o=i+this.break;if(t>=o)return this.right.decomposeRight(t-o,n);t<i&&this.left.decomposeRight(t,n),this.break&&t<o&&n.push(null),n.push(this.right)}balanced(t,n){return t.size>2*n.size||n.size>2*t.size?re.of(this.break?[t,null,n]:[t,n]):(this.left=Nr(this.left,t),this.right=Nr(this.right,n),this.setHeight(t.height+n.height),this.outdated=t.outdated||n.outdated,this.size=t.size+n.size,this.length=t.length+this.break+n.length,this)}updateHeight(t,n=0,i=!1,o){let{left:s,right:l}=this,a=n+s.length+this.break,u=null;return o&&o.from<=n+s.length&&o.more?u=s=s.updateHeight(t,n,i,o):s.updateHeight(t,n,i),o&&o.from<=a+l.length&&o.more?u=l=l.updateHeight(t,a,i,o):l.updateHeight(t,a,i),u?this.balanced(s,l):(this.height=this.left.height+this.right.height,this.outdated=!1,this)}toString(){return this.left+(this.break?" 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t>e&&this.span(e,t);this.lineEnd>-1&&this.lineEnd<this.pos&&(this.lineEnd=this.oracle.doc.lineAt(this.pos).to)}enterLine(){if(this.lineStart>-1)return;let{from:e,to:t}=this.oracle.doc.lineAt(this.pos);this.lineStart=e,this.lineEnd=t,this.writtenTo<e&&((this.writtenTo<e-1||this.nodes[this.nodes.length-1]==null)&&this.nodes.push(this.blankContent(this.writtenTo,e-1)),this.nodes.push(null)),this.pos>e&&this.nodes.push(new ye(this.pos-e,-1,0)),this.writtenTo=this.pos}blankContent(e,t){let n=new et(t-e);return this.oracle.doc.lineAt(e).to==t&&(n.flags|=4),n}ensureLine(){this.enterLine();let e=this.nodes.length?this.nodes[this.nodes.length-1]:null;if(e instanceof ye)return e;let t=new ye(0,-1,0);return this.nodes.push(t),t}addBlock(e){this.enterLine();let t=e.deco;t&&t.startSide>0&&!this.isCovered&&this.ensureLine(),this.nodes.push(e),this.writtenTo=this.pos=this.pos+e.length,t&&t.endSide>0&&(this.covering=e)}addLineDeco(e,t,n){let i=this.ensureLine();i.length+=n,i.collapsed+=n,i.widgetHeight=Math.max(i.widgetHeight,e),i.breaks+=t,this.writtenTo=this.pos=this.pos+n}finish(e){let t=this.nodes.length==0?null:this.nodes[this.nodes.length-1];this.lineStart>-1&&!(t instanceof ye)&&!this.isCovered?this.nodes.push(new ye(0,-1,0)):(this.writtenTo<this.pos||t==null)&&this.nodes.push(this.blankContent(this.writtenTo,this.pos));let n=e;for(let i of this.nodes)i instanceof ye&&i.updateHeight(this.oracle,n),n+=i?i.length:1;return this.nodes}static build(e,t,n,i){let o=new r(n,e);return N.spans(t,n,i,o,0),o.finish(n)}};function ol(r,e,t){let n=new xo;return N.compare(r,e,t,n,0),n.changes}var xo=class{constructor(){this.changes=[]}compareRange(){}comparePoint(e,t,n,i){(e<t||n&&n.heightRelevant||i&&i.heightRelevant)&&Je(e,t,this.changes,5)}};function Pu(r,e){let t=r.getBoundingClientRect(),n=r.ownerDocument,i=n.defaultView||window,o=Math.max(0,t.left),s=Math.min(i.innerWidth,t.right),l=Math.max(0,t.top),a=Math.min(i.innerHeight,t.bottom);for(let u=r.parentNode;u&&u!=n.body;)if(u.nodeType==1){let h=u,c=window.getComputedStyle(h);if((h.scrollHeight>h.clientHeight||h.scrollWidth>h.clientWidth)&&c.overflow!="visible"){let f=h.getBoundingClientRect();o=Math.max(o,f.left),s=Math.min(s,f.right),l=Math.max(l,f.top),a=Math.min(u==r.parentNode?i.innerHeight:a,f.bottom)}u=c.position=="absolute"||c.position=="fixed"?h.offsetParent:h.parentNode}else if(u.nodeType==11)u=u.host;else break;return{left:o-t.left,right:Math.max(o,s)-t.left,top:l-(t.top+e),bottom:Math.max(l,a)-(t.top+e)}}function Vu(r){let e=r.getBoundingClientRect(),t=r.ownerDocument.defaultView||window;return e.left<t.innerWidth&&e.right>0&&e.top<t.innerHeight&&e.bottom>0}function Hu(r,e){let t=r.getBoundingClientRect();return{left:0,right:t.right-t.left,top:e,bottom:t.bottom-(t.top+e)}}var Sn=class{constructor(e,t,n,i){this.from=e;this.to=t;this.size=n;this.displaySize=i}static same(e,t){if(e.length!=t.length)return!1;for(let n=0;n<e.length;n++){let i=e[n],o=t[n];if(i.from!=o.from||i.to!=o.to||i.size!=o.size)return!1}return!0}draw(e,t){return V.replace({widget:new To(this.displaySize*(t?e.scaleY:e.scaleX),t)}).range(this.from,this.to)}},To=class extends ke{constructor(t,n){super();this.size=t;this.vertical=n}eq(t){return t.size==this.size&&t.vertical==this.vertical}toDOM(){let t=document.createElement("div");return this.vertical?t.style.height=this.size+"px":(t.style.width=this.size+"px",t.style.height="2px",t.style.display="inline-block"),t}get estimatedHeight(){return this.vertical?this.size:-1}};var Tn=class{constructor(e,t){this.view=e;this.state=t;this.pixelViewport={left:0,right:window.innerWidth,top:0,bottom:0};this.inView=!0;this.paddingTop=0;this.paddingBottom=0;this.contentDOMWidth=0;this.contentDOMHeight=0;this.editorHeight=0;this.editorWidth=0;this.scaleX=1;this.scaleY=1;this.scrollOffset=0;this.scrolledToBottom=!1;this.scrollAnchorPos=0;this.scrollAnchorHeight=-1;this.scaler=sl;this.scrollTarget=null;this.printing=!1;this.mustMeasureContent=!0;this.defaultTextDirection=0;this.visibleRanges=[];this.mustEnforceCursorAssoc=!1;let n=t.facet(dn).some(i=>typeof i!="function"&&i.class=="cm-lineWrapping");this.heightOracle=new Lr(n),this.stateDeco=ll(t),this.heightMap=re.empty().applyChanges(this.stateDeco,A.empty,this.heightOracle.setDoc(t.doc),[new he(0,0,0,t.doc.length)]);for(let i=0;i<2&&(this.viewport=this.getViewport(0,null),!!this.updateForViewport());i++);this.updateViewportLines(),this.lineGaps=this.ensureLineGaps([]),this.lineGapDeco=V.set(this.lineGaps.map(i=>i.draw(this,!1))),this.scrollParent=e.scrollDOM,this.computeVisibleRanges()}updateForViewport(){let e=[this.viewport],{main:t}=this.state.selection;for(let n=0;n<=1;n++){let i=n?t.head:t.anchor;if(!e.some(({from:o,to:s})=>i>=o&&i<=s)){let{from:o,to:s}=this.lineBlockAt(i);e.push(new Jt(o,s))}}return this.viewports=e.sort((n,i)=>n.from-i.from),this.updateScaler()}updateScaler(){let e=this.scaler;return this.scaler=this.heightMap.height<=7e6?sl:new wo(this.heightOracle,this.heightMap,this.viewports),e.eq(this.scaler)?0:2}updateViewportLines(){this.viewportLines=[],this.heightMap.forEachLine(this.viewport.from,this.viewport.to,this.heightOracle.setDoc(this.state.doc),0,0,e=>{this.viewportLines.push(xn(e,this.scaler))})}update(e,t=null){this.state=e.state;let n=this.stateDeco;this.stateDeco=ll(this.state);let i=e.changedRanges,o=he.extendWithRanges(i,ol(n,this.stateDeco,e?e.changes:G.empty(this.state.doc.length))),s=this.heightMap.height,l=this.scrolledToBottom?null:this.scrollAnchorAt(this.scrollOffset);So(),this.heightMap=this.heightMap.applyChanges(this.stateDeco,e.startState.doc,this.heightOracle.setDoc(this.state.doc),o),(this.heightMap.height!=s||vt)&&(e.flags|=2),l?(this.scrollAnchorPos=e.changes.mapPos(l.from,-1),this.scrollAnchorHeight=l.top):(this.scrollAnchorPos=-1,this.scrollAnchorHeight=s);let a=o.length?this.mapViewport(this.viewport,e.changes):this.viewport;(t&&(t.range.head<a.from||t.range.head>a.to)||!this.viewportIsAppropriate(a))&&(a=this.getViewport(0,t));let u=a.from!=this.viewport.from||a.to!=this.viewport.to;this.viewport=a,e.flags|=this.updateForViewport(),(u||!e.changes.empty||e.flags&2)&&this.updateViewportLines(),(this.lineGaps.length||this.viewport.to-this.viewport.from>4e3)&&this.updateLineGaps(this.ensureLineGaps(this.mapLineGaps(this.lineGaps,e.changes))),e.flags|=this.computeVisibleRanges(e.changes),t&&(this.scrollTarget=t),!this.mustEnforceCursorAssoc&&(e.selectionSet||e.focusChanged)&&e.view.lineWrapping&&e.state.selection.main.empty&&e.state.selection.main.assoc&&!e.state.facet(fr)&&(this.mustEnforceCursorAssoc=!0)}measure(){let{view:e}=this,t=e.contentDOM,n=window.getComputedStyle(t),i=this.heightOracle,o=n.whiteSpace;this.defaultTextDirection=n.direction=="rtl"?1:0;let s=this.heightOracle.mustRefreshForWrapping(o)||this.mustMeasureContent==="refresh",l=t.getBoundingClientRect(),a=s||this.mustMeasureContent||this.contentDOMHeight!=l.height;this.contentDOMHeight=l.height,this.mustMeasureContent=!1;let u=0,h=0;if(l.width&&l.height){let{scaleX:w,scaleY:x}=Pi(t,l);(w>.005&&Math.abs(this.scaleX-w)>.005||x>.005&&Math.abs(this.scaleY-x)>.005)&&(this.scaleX=w,this.scaleY=x,u|=16,s=a=!0)}let c=(parseInt(n.paddingTop)||0)*this.scaleY,f=(parseInt(n.paddingBottom)||0)*this.scaleY;(this.paddingTop!=c||this.paddingBottom!=f)&&(this.paddingTop=c,this.paddingBottom=f,u|=18),this.editorWidth!=e.scrollDOM.clientWidth&&(i.lineWrapping&&(a=!0),this.editorWidth=e.scrollDOM.clientWidth,u|=16);let m=rr(this.view.contentDOM,!1).y;m!=this.scrollParent&&(this.scrollParent=m,this.scrollAnchorHeight=-1,this.scrollOffset=0);let d=this.getScrollOffset();this.scrollOffset!=d&&(this.scrollAnchorHeight=-1,this.scrollOffset=d),this.scrolledToBottom=or(this.scrollParent||e.win);let p=(this.printing?Hu:Pu)(t,this.paddingTop),g=p.top-this.pixelViewport.top,b=p.bottom-this.pixelViewport.bottom;this.pixelViewport=p;let C=this.pixelViewport.bottom>this.pixelViewport.top&&this.pixelViewport.right>this.pixelViewport.left;if(C!=this.inView&&(this.inView=C,C&&(a=!0)),!this.inView&&!this.scrollTarget&&!Vu(e.dom))return 0;let v=l.width;if((this.contentDOMWidth!=v||this.editorHeight!=e.scrollDOM.clientHeight)&&(this.contentDOMWidth=l.width,this.editorHeight=e.scrollDOM.clientHeight,u|=16),a){let w=e.docView.measureVisibleLineHeights(this.viewport);if(i.mustRefreshForHeights(w)&&(s=!0),s||i.lineWrapping&&Math.abs(v-this.contentDOMWidth)>i.charWidth){let{lineHeight:x,charWidth:k,textHeight:B}=e.docView.measureTextSize();s=x>0&&i.refresh(o,x,k,B,Math.max(5,v/k),w),s&&(e.docView.minWidth=0,u|=16)}g>0&&b>0?h=Math.max(g,b):g<0&&b<0&&(h=Math.min(g,b)),So();for(let x of this.viewports){let k=x.from==this.viewport.from?w:e.docView.measureVisibleLineHeights(x);this.heightMap=(s?re.empty().applyChanges(this.stateDeco,A.empty,this.heightOracle,[new he(0,0,0,e.state.doc.length)]):this.heightMap).updateHeight(i,0,s,new Ir(x.from,k))}vt&&(u|=2)}let M=!this.viewportIsAppropriate(this.viewport,h)||this.scrollTarget&&(this.scrollTarget.range.head<this.viewport.from||this.scrollTarget.range.head>this.viewport.to);return M&&(u&2&&(u|=this.updateScaler()),this.viewport=this.getViewport(h,this.scrollTarget),u|=this.updateForViewport()),(u&2||M)&&this.updateViewportLines(),(this.lineGaps.length||this.viewport.to-this.viewport.from>4e3)&&this.updateLineGaps(this.ensureLineGaps(s?[]:this.lineGaps,e)),u|=this.computeVisibleRanges(),this.mustEnforceCursorAssoc&&(this.mustEnforceCursorAssoc=!1,e.docView.enforceCursorAssoc()),u}get visibleTop(){return this.scaler.fromDOM(this.pixelViewport.top)}get visibleBottom(){return this.scaler.fromDOM(this.pixelViewport.bottom)}getViewport(e,t){let n=.5-Math.max(-.5,Math.min(.5,e/1e3/2)),i=this.heightMap,o=this.heightOracle,{visibleTop:s,visibleBottom:l}=this,a=new 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i&&!this.selectionChanged&&e.inputState.lastFocusTime>Date.now()-200&&e.inputState.lastTouchTime<Date.now()-300&&Ds(this.dom,n)?(this.view.inputState.lastFocusTime=0,e.docView.updateSelection(),!1):(this.selectionRange.setRange(n),i&&(this.selectionChanged=!0),!0)}setSelectionRange(e,t){this.selectionRange.set(e.node,e.offset,t.node,t.offset),this.selectionChanged=!1}clearSelectionRange(){this.selectionRange.set(null,0,null,0)}listenForScroll(){this.parentCheck=-1;let e=0,t=null;for(let n=this.dom;n;)if(n.nodeType==1)!t&&e<this.scrollTargets.length&&this.scrollTargets[e]==n?e++:t||(t=this.scrollTargets.slice(0,e)),t&&t.push(n),n=n.assignedSlot||n.parentNode;else if(n.nodeType==11)n=n.host;else break;if(e<this.scrollTargets.length&&!t&&(t=this.scrollTargets.slice(0,e)),t){for(let n of this.scrollTargets)n.removeEventListener("scroll",this.onScroll);for(let n of this.scrollTargets=t)n.addEventListener("scroll",this.onScroll)}}ignore(e){if(!this.active)return e();try{return this.stop(),e()}finally{this.start(),this.clear()}}start(){this.active||(this.observer.observe(this.dom,zu),Mo&&this.dom.addEventListener("DOMCharacterDataModified",this.onCharData),this.active=!0)}stop(){this.active&&(this.active=!1,this.observer.disconnect(),Mo&&this.dom.removeEventListener("DOMCharacterDataModified",this.onCharData))}clear(){this.processRecords(),this.queue.length=0,this.selectionChanged=!1}delayAndroidKey(e,t){if(!this.delayedAndroidKey){let n=()=>{let i=this.delayedAndroidKey;i&&(this.clearDelayedAndroidKey(),this.view.inputState.lastKeyCode=i.keyCode,this.view.inputState.lastKeyTime=Date.now(),!this.flush()&&i.force&&He(this.dom,i.key,i.keyCode))};this.flushingAndroidKey=this.view.win.requestAnimationFrame(n)}(!this.delayedAndroidKey||e=="Enter")&&(this.delayedAndroidKey={key:e,keyCode:t,force:this.lastChange<Date.now()-50||!!this.delayedAndroidKey?.force})}clearDelayedAndroidKey(){this.win.cancelAnimationFrame(this.flushingAndroidKey),this.delayedAndroidKey=null,this.flushingAndroidKey=-1}flushSoon(){this.delayedFlush<0&&(this.delayedFlush=this.view.win.requestAnimationFrame(()=>{this.delayedFlush=-1,this.flush()}))}forceFlush(){this.delayedFlush>=0&&(this.view.win.cancelAnimationFrame(this.delayedFlush),this.delayedFlush=-1),this.flush()}pendingRecords(){for(let e of this.observer.takeRecords())this.queue.push(e);return this.queue}processRecords(){let e=this.pendingRecords();e.length&&(this.queue=[]);let t=-1,n=-1,i=!1;for(let o of e){let s=this.readMutation(o);s&&(s.typeOver&&(i=!0),t==-1?{from:t,to:n}=s:(t=Math.min(s.from,t),n=Math.max(s.to,n)))}return{from:t,to:n,typeOver:i}}readChange(){let{from:e,to:t,typeOver:n}=this.processRecords(),i=this.selectionChanged&&Ye(this.dom,this.selectionRange);if(e<0&&!i)return null;e>-1&&(this.lastChange=Date.now()),this.view.inputState.lastFocusTime=0,this.selectionChanged=!1;let o=new Mr(this.view,e,t,n);return this.view.docView.domChanged={newSel:o.newSel?o.newSel.main:null},o}flush(e=!0){if(this.delayedFlush>=0||this.delayedAndroidKey)return!1;e&&this.readSelectionRange();let t=this.readChange();if(!t)return this.view.requestMeasure(),!1;let n=this.view.state,i=Er(this.view,t);return this.view.state==n&&(t.domChanged||t.newSel&&!bn(this.view.state.selection,t.newSel.main))&&this.view.update([]),i}readMutation(e){let t=this.view.docView.tile.nearest(e.target);if(!t||t.isWidget())return null;if(t.markDirty(e.type=="attributes"),e.type=="childList"){let n=ul(t,e.previousSibling||e.target.previousSibling,-1),i=ul(t,e.nextSibling||e.target.nextSibling,1);return{from:n?t.posAfter(n):t.posAtStart,to:i?t.posBefore(i):t.posAtEnd,typeOver:!1}}else return e.type=="characterData"?{from:t.posAtStart,to:t.posAtEnd,typeOver:e.target.nodeValue==e.oldValue}:null}setWindow(e){e!=this.win&&(this.removeWindowListeners(this.win),this.win=e,this.addWindowListeners(this.win))}addWindowListeners(e){e.addEventListener("resize",this.onResize),this.printQuery?this.printQuery.addEventListener?this.printQuery.addEventListener("change",this.onPrint):this.printQuery.addListener(this.onPrint):e.addEventListener("beforeprint",this.onPrint),e.addEventListener("scroll",this.onScroll),e.document.addEventListener("selectionchange",this.onSelectionChange)}removeWindowListeners(e){e.removeEventListener("scroll",this.onScroll),e.removeEventListener("resize",this.onResize),this.printQuery?this.printQuery.removeEventListener?this.printQuery.removeEventListener("change",this.onPrint):this.printQuery.removeListener(this.onPrint):e.removeEventListener("beforeprint",this.onPrint),e.document.removeEventListener("selectionchange",this.onSelectionChange)}update(e){this.editContext&&(this.editContext.update(e),e.startState.facet(ce)!=e.state.facet(ce)&&(e.view.contentDOM.editContext=e.state.facet(ce)?this.editContext.editContext:null))}destroy(){this.stop(),this.intersection?.disconnect(),this.gapIntersection?.disconnect(),this.resizeScroll?.disconnect();for(let e of this.scrollTargets)e.removeEventListener("scroll",this.onScroll);this.removeWindowListeners(this.win),clearTimeout(this.parentCheck),clearTimeout(this.resizeTimeout),this.win.cancelAnimationFrame(this.delayedFlush),this.win.cancelAnimationFrame(this.flushingAndroidKey),this.editContext&&(this.view.contentDOM.editContext=null,this.editContext.destroy())}};function ul(r,e,t){for(;e;){let n=O.get(e);if(n&&n.parent==r)return n;let i=e.parentNode;e=i!=r.dom?i:t>0?e.nextSibling:e.previousSibling}return null}function hl(r,e){let t=e.startContainer,n=e.startOffset,i=e.endContainer,o=e.endOffset,s=r.docView.domAtPos(r.state.selection.main.anchor,1);return bt(s.node,s.offset,i,o)&&([t,n,i,o]=[i,o,t,n]),{anchorNode:t,anchorOffset:n,focusNode:i,focusOffset:o}}function Ku(r,e){if(e.getComposedRanges){let i=e.getComposedRanges(r.root)[0];if(i)return hl(r,i)}let t=null;function n(i){i.preventDefault(),i.stopImmediatePropagation(),t=i.getTargetRanges()[0]}return r.contentDOM.addEventListener("beforeinput",n,!0),r.dom.ownerDocument.execCommand("indent"),r.contentDOM.removeEventListener("beforeinput",n,!0),t?hl(r,t):null}var Eo=class{constructor(e){this.from=0;this.to=0;this.pendingContextChange=null;this.handlers=Object.create(null);this.composing=null;this.resetRange(e.state);let t=this.editContext=new window.EditContext({text:e.state.doc.sliceString(this.from,this.to),selectionStart:this.toContextPos(Math.max(this.from,Math.min(this.to,e.state.selection.main.anchor))),selectionEnd:this.toContextPos(e.state.selection.main.head)});this.handlers.textupdate=n=>{let i=e.state.selection.main,{anchor:o,head:s}=i,l=this.toEditorPos(n.updateRangeStart),a=this.toEditorPos(n.updateRangeEnd);e.inputState.composing>=0&&!this.composing&&(this.composing={contextBase:n.updateRangeStart,editorBase:l,drifted:!1});let u=a-l>n.text.length;l==this.from&&o<this.from?l=o:a==this.to&&o>this.to&&(a=o);let h=ho(e.state.sliceDoc(l,a),n.text,(u?i.from:i.to)-l,u?"end":null);if(!h){let f=y.single(this.toEditorPos(n.selectionStart),this.toEditorPos(n.selectionEnd));bn(f,i)||e.dispatch({selection:f,userEvent:"select"});return}let c={from:h.from+l,to:h.toA+l,insert:A.of(n.text.slice(h.from,h.toB).split(`
+`))};if((S.mac||S.android)&&c.from==s-1&&/^\. ?$/.test(n.text)&&e.contentDOM.getAttribute("autocorrect")=="off"&&(c={from:l,to:a,insert:A.of([n.text.replace("."," ")])}),this.pendingContextChange=c,!e.state.readOnly){let f=this.to-this.from+(c.to-c.from+c.insert.length);yn(e,c,y.single(this.toEditorPos(n.selectionStart,f),this.toEditorPos(n.selectionEnd,f)))}this.pendingContextChange&&(this.revertPending(e.state),this.setSelection(e.state)),c.from<c.to&&!c.insert.length&&e.inputState.composing>=0&&!/[\\p{Alphabetic}\\p{Number}_]/.test(t.text.slice(Math.max(0,n.updateRangeStart-1),Math.min(t.text.length,n.updateRangeStart+1)))&&this.handlers.compositionend(n)},this.handlers.characterboundsupdate=n=>{let i=[],o=null;for(let s=this.toEditorPos(n.rangeStart),l=this.toEditorPos(n.rangeEnd);s<l;s++){let a=e.coordsForChar(s);o=a&&new DOMRect(a.left,a.top,a.right-a.left,a.bottom-a.top)||o||new DOMRect,i.push(o)}t.updateCharacterBounds(n.rangeStart,i)},this.handlers.textformatupdate=n=>{let i=[];for(let o of n.getTextFormats()){let s=o.underlineStyle,l=o.underlineThickness;if(!/none/i.test(s)&&!/none/i.test(l)){let a=this.toEditorPos(o.rangeStart),u=this.toEditorPos(o.rangeEnd);if(a<u){let h=`text-decoration: underline ${/^[a-z]/.test(s)?s+" ":s=="Dashed"?"dashed ":s=="Squiggle"?"wavy ":""}${/thin/i.test(l)?1:2}px`;i.push(V.mark({attributes:{style:h}}).range(a,u))}}}e.dispatch({effects:mr.of(V.set(i))})},this.handlers.compositionstart=()=>{e.inputState.composing<0&&(e.inputState.composing=0,e.inputState.compositionFirstChange=!0)},this.handlers.compositionend=()=>{if(e.inputState.composing=-1,e.inputState.compositionFirstChange=null,this.composing){let{drifted:n}=this.composing;this.composing=null,n&&this.reset(e.state)}};for(let n in this.handlers)t.addEventListener(n,this.handlers[n]);this.measureReq={read:n=>{this.editContext.updateControlBounds(n.contentDOM.getBoundingClientRect());let i=$e(n.root);i&&i.rangeCount&&this.editContext.updateSelectionBounds(i.getRangeAt(0).getBoundingClientRect())}}}applyEdits(e){let t=0,n=!1,i=this.pendingContextChange;return e.changes.iterChanges((o,s,l,a,u)=>{if(n)return;let h=u.length-(s-o);if(i&&s>=i.to)if(i.from==o&&i.to==s&&i.insert.eq(u)){i=this.pendingContextChange=null,t+=h,this.to+=h;return}else i=null,this.revertPending(e.state);if(o+=t,s+=t,s<=this.from)this.from+=h,this.to+=h;else if(o<this.to){if(o<this.from||s>this.to||this.to-this.from+u.length>3e4){n=!0;return}this.editContext.updateText(this.toContextPos(o),this.toContextPos(s),u.toString()),this.to+=h}t+=h}),i&&!n&&this.revertPending(e.state),!n}update(e){let t=this.pendingContextChange,n=e.startState.selection.main;this.composing&&(this.composing.drifted||!e.changes.touchesRange(n.from,n.to)&&e.transactions.some(i=>!i.isUserEvent("input.type")&&i.changes.touchesRange(this.from,this.to)))?(this.composing.drifted=!0,this.composing.editorBase=e.changes.mapPos(this.composing.editorBase)):!this.applyEdits(e)||!this.rangeIsValid(e.state)?(this.pendingContextChange=null,this.reset(e.state)):(e.docChanged||e.selectionSet||t)&&this.setSelection(e.state),(e.geometryChanged||e.docChanged||e.selectionSet)&&e.view.requestMeasure(this.measureReq)}resetRange(e){let{head:t}=e.selection.main;this.from=Math.max(0,t-1e4),this.to=Math.min(e.doc.length,t+1e4)}reset(e){this.resetRange(e),this.editContext.updateText(0,this.editContext.text.length,e.doc.sliceString(this.from,this.to)),this.setSelection(e)}revertPending(e){let t=this.pendingContextChange;this.pendingContextChange=null,this.editContext.updateText(this.toContextPos(t.from),this.toContextPos(t.from+t.insert.length),e.doc.sliceString(t.from,t.to))}setSelection(e){let{main:t}=e.selection,n=this.toContextPos(Math.max(this.from,Math.min(this.to,t.anchor))),i=this.toContextPos(t.head);(this.editContext.selectionStart!=n||this.editContext.selectionEnd!=i)&&this.editContext.updateSelection(n,i)}rangeIsValid(e){let{head:t}=e.selection.main;return!(this.from>0&&t-this.from<500||this.to<e.doc.length&&this.to-t<500||this.to-this.from>1e4*3)}toEditorPos(e,t=this.to-this.from){e=Math.min(e,t);let n=this.composing;return n&&n.drifted?n.editorBase+(e-n.contextBase):e+this.from}toContextPos(e){let t=this.composing;return t&&t.drifted?t.contextBase+(e-t.editorBase):e-this.from}destroy(){for(let e in this.handlers)this.editContext.removeEventListener(e,this.handlers[e])}};var K=class r{constructor(e={}){this.plugins=[];this.pluginMap=new Map;this.editorAttrs={};this.contentAttrs={};this.bidiCache=[];this.destroyed=!1;this.updateState=2;this.measureScheduled=-1;this.measureRequests=[];this.contentDOM=document.createElement("div"),this.scrollDOM=document.createElement("div"),this.scrollDOM.tabIndex=-1,this.scrollDOM.className="cm-scroller",this.scrollDOM.appendChild(this.contentDOM),this.announceDOM=document.createElement("div"),this.announceDOM.className="cm-announced",this.announceDOM.setAttribute("aria-live","polite"),this.dom=document.createElement("div"),this.dom.appendChild(this.announceDOM),this.dom.appendChild(this.scrollDOM),e.parent&&e.parent.appendChild(this.dom);let{dispatch:t}=e;this.dispatchTransactions=e.dispatchTransactions||t&&(n=>n.forEach(i=>t(i,this)))||(n=>this.update(n)),this.dispatch=this.dispatch.bind(this),this._root=e.root||As(e.parent)||document,this.viewState=new Tn(this,e.state||j.create(e)),e.scrollTo&&e.scrollTo.is(fn)&&(this.viewState.scrollTarget=e.scrollTo.value.clip(this.viewState.state)),this.plugins=this.state.facet(xt).map(n=>new zt(n));for(let n of this.plugins)n.update(this);this.observer=new Kr(this),this.inputState=new Br(this),this.inputState.ensureHandlers(this.plugins),this.docView=new pn(this),this.mountStyles(),this.updateAttrs(),this.updateState=0,this.requestMeasure(),document.fonts?.ready&&document.fonts.ready.then(()=>{this.viewState.mustMeasureContent="refresh",this.requestMeasure()})}get state(){return this.viewState.state}get viewport(){return this.viewState.viewport}get visibleRanges(){return this.viewState.visibleRanges}get inView(){return this.viewState.inView}get composing(){return!!this.inputState&&this.inputState.composing>0}get compositionStarted(){return!!this.inputState&&this.inputState.composing>=0}get root(){return this._root}get win(){return this.dom.ownerDocument.defaultView||window}dispatch(...e){let t=e.length==1&&e[0]instanceof X?e:e.length==1&&Array.isArray(e[0])?e[0]:[this.state.update(...e)];this.dispatchTransactions(t,this)}update(e){if(this.updateState!=0)throw new Error("Calls to EditorView.update are not allowed while an update is in progress");let t=!1,n=!1,i,o=this.state;for(let f of e){if(f.startState!=o)throw new RangeError("Trying to update state with a transaction that doesn't start from the previous state.");o=f.state}if(this.destroyed){this.viewState.state=o;return}let s=this.hasFocus,l=0,a=null;e.some(f=>f.annotation(po))?(this.inputState.notifiedFocused=s,l=1):s!=this.inputState.notifiedFocused&&(this.inputState.notifiedFocused=s,a=go(o,s),a||(l=1));let u=this.observer.delayedAndroidKey,h=null;if(u?(this.observer.clearDelayedAndroidKey(),h=this.observer.readChange(),(h&&!this.state.doc.eq(o.doc)||!this.state.selection.eq(o.selection))&&(h=null)):this.observer.clear(),o.facet(j.phrases)!=this.state.facet(j.phrases))return this.setState(o);i=Kt.create(this,o,e),i.flags|=l;let c=this.viewState.scrollTarget;try{this.updateState=2;for(let f of e){if(c&&(c=c.map(f.changes)),f.scrollIntoView){let{main:m}=f.state.selection,{x:d,y:p}=this.state.facet(r.cursorScrollMargin);c=new Wt(m.empty?m:y.cursor(m.head,m.head>m.anchor?-1:1),"nearest","nearest",p,d)}for(let m of f.effects)m.is(fn)&&(c=m.value.clip(this.state))}this.viewState.update(i,c),this.bidiCache=Ur.update(this.bidiCache,i.changes),i.empty||(this.updatePlugins(i),this.inputState.update(i)),t=this.docView.update(i),this.state.facet(qt)!=this.styleModules&&this.mountStyles(),n=this.updateAttrs(),this.showAnnouncements(e),this.docView.updateSelection(t,e.some(f=>f.isUserEvent("select.pointer")))}finally{this.updateState=0}if(i.startState.facet(wn)!=i.state.facet(wn)&&(this.viewState.mustMeasureContent=!0),(t||n||c||this.viewState.mustEnforceCursorAssoc||this.viewState.mustMeasureContent)&&this.requestMeasure(),t&&this.docViewUpdate(),!i.empty)for(let f of this.state.facet(ur))try{f(i)}catch(m){_(this.state,m,"update listener")}(a||h)&&Promise.resolve().then(()=>{a&&this.state==a.startState&&this.dispatch(a),h&&!Er(this,h)&&u.force&&He(this.contentDOM,u.key,u.keyCode)})}setState(e){if(this.updateState!=0)throw new Error("Calls to EditorView.setState are not allowed while an update is in progress");if(this.destroyed){this.viewState.state=e;return}this.updateState=2;let t=this.hasFocus;try{for(let n of this.plugins)n.destroy(this);this.viewState=new Tn(this,e),this.plugins=e.facet(xt).map(n=>new zt(n)),this.pluginMap.clear();for(let n of this.plugins)n.update(this);this.docView.destroy(),this.docView=new pn(this),this.inputState.ensureHandlers(this.plugins),this.mountStyles(),this.updateAttrs(),this.bidiCache=[]}finally{this.updateState=0}t&&this.focus(),this.requestMeasure()}updatePlugins(e){let t=e.startState.facet(xt),n=e.state.facet(xt);if(t!=n){let i=[];for(let o of n){let s=t.indexOf(o);if(s<0)i.push(new zt(o));else{let l=this.plugins[s];l.mustUpdate=e,i.push(l)}}for(let o of this.plugins)o.mustUpdate!=e&&o.destroy(this);this.plugins=i,this.pluginMap.clear()}else for(let i of this.plugins)i.mustUpdate=e;for(let i=0;i<this.plugins.length;i++)this.plugins[i].update(this);t!=n&&this.inputState.ensureHandlers(this.plugins)}docViewUpdate(){for(let e of this.plugins){let t=e.value;if(t&&t.docViewUpdate)try{t.docViewUpdate(this)}catch(n){_(this.state,n,"doc view update listener")}}}measure(e=!0){if(this.destroyed)return;if(this.measureScheduled>-1&&this.win.cancelAnimationFrame(this.measureScheduled),this.observer.delayedAndroidKey){this.measureScheduled=-1,this.requestMeasure();return}this.measureScheduled=0,e&&this.observer.forceFlush();let t=null,n=this.viewState.scrollParent,i=this.viewState.getScrollOffset(),{scrollAnchorPos:o,scrollAnchorHeight:s}=this.viewState;Math.abs(i-this.viewState.scrollOffset)>1&&(s=-1),this.viewState.scrollAnchorHeight=-1;try{for(let l=0;;l++){if(s<0)if(or(n||this.win))o=-1,s=this.viewState.heightMap.height;else{let m=this.viewState.scrollAnchorAt(i);o=m.from,s=m.top}this.updateState=1;let a=this.viewState.measure();if(!a&&!this.measureRequests.length&&this.viewState.scrollTarget==null)break;if(l>5){console.warn(this.measureRequests.length?"Measure loop restarted more than 5 times":"Viewport failed to stabilize");break}let u=[];a&4||([this.measureRequests,u]=[u,this.measureRequests]);let h=u.map(m=>{try{return m.read(this)}catch(d){return _(this.state,d),cl}}),c=Kt.create(this,this.state,[]),f=!1;c.flags|=a,t?t.flags|=a:t=c,this.updateState=2,c.empty||(this.updatePlugins(c),this.inputState.update(c),this.updateAttrs(),f=this.docView.update(c),f&&this.docViewUpdate());for(let m=0;m<u.length;m++)if(h[m]!=cl)try{let d=u[m];d.write&&d.write(h[m],this)}catch(d){_(this.state,d)}if(f&&this.docView.updateSelection(!0),!c.viewportChanged&&this.measureRequests.length==0){if(this.viewState.editorHeight)if(this.viewState.scrollTarget){this.docView.scrollIntoView(this.viewState.scrollTarget),this.viewState.scrollTarget=null,s=-1;continue}else{let d=((o<0?this.viewState.heightMap.height:this.viewState.lineBlockAt(o).top)-s)/this.scaleY;if((d>1||d<-1)&&(n==this.scrollDOM||this.hasFocus||Math.max(this.inputState.lastWheelEvent,this.inputState.lastTouchTime)>Date.now()-100)){i=i+d,n?n.scrollTop+=d:this.win.scrollBy(0,d),s=-1;continue}}break}}}finally{this.updateState=0,this.measureScheduled=-1}if(t&&!t.empty)for(let l of this.state.facet(ur))l(t)}get themeClasses(){return Wr+" "+(this.state.facet(Fr)?ko:Co)+" "+this.state.facet(wn)}updateAttrs(){let e=fl(this,$i,{class:"cm-editor"+(this.hasFocus?" cm-focused ":" ")+this.themeClasses}),t={spellcheck:"false",autocorrect:"off",autocapitalize:"off",writingsuggestions:"false",translate:"no",contenteditable:this.state.facet(ce)?"true":"false",class:"cm-content",style:`${S.tabSize}: ${this.state.tabSize}`,role:"textbox","aria-multiline":"true"};this.state.readOnly&&(t["aria-readonly"]="true"),fl(this,dn,t);let n=this.observer.ignore(()=>{let i=Ni(this.contentDOM,this.contentAttrs,t),o=Ni(this.dom,this.editorAttrs,e);return i||o});return this.editorAttrs=e,this.contentAttrs=t,n}showAnnouncements(e){let t=!0;for(let n of e)for(let i of n.effects)if(i.is(r.announce)){t&&(this.announceDOM.textContent=""),t=!1;let o=this.announceDOM.appendChild(document.createElement("div"));o.textContent=i.value}}mountStyles(){this.styleModules=this.state.facet(qt);let e=this.state.facet(r.cspNonce);Pe.mount(this.root,this.styleModules.concat(al).reverse(),e?{nonce:e}:void 0)}readMeasured(){if(this.updateState==2)throw new Error("Reading the editor layout isn't allowed during an update");this.updateState==0&&this.measureScheduled>-1&&this.measure(!1)}requestMeasure(e){if(this.measureScheduled<0&&(this.measureScheduled=this.win.requestAnimationFrame(()=>this.measure())),e){if(this.measureRequests.indexOf(e)>-1)return;if(e.key!=null){for(let t=0;t<this.measureRequests.length;t++)if(this.measureRequests[t].key===e.key){this.measureRequests[t]=e;return}}this.measureRequests.push(e)}}plugin(e){let t=this.pluginMap.get(e);return(t===void 0||t&&t.plugin!=e)&&this.pluginMap.set(e,t=this.plugins.find(n=>n.plugin==e)||null),t&&t.update(this).value}get documentTop(){return this.contentDOM.getBoundingClientRect().top+this.viewState.paddingTop}get documentPadding(){return{top:this.viewState.paddingTop,bottom:this.viewState.paddingBottom}}get scaleX(){return this.viewState.scaleX}get scaleY(){return this.viewState.scaleY}elementAtHeight(e){return this.readMeasured(),this.viewState.elementAtHeight(e)}lineBlockAtHeight(e){return 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i=this.state.doc.lineAt(e),o=this.bidiSpans(i),s=o[te.find(o,e-i.from,-1,t)];return Ft(n,s.dir==0==t>0)}coordsForChar(e){return this.readMeasured(),this.docView.coordsForChar(e)}get defaultCharacterWidth(){return this.viewState.heightOracle.charWidth}get defaultLineHeight(){return this.viewState.heightOracle.lineHeight}get textDirection(){return this.viewState.defaultTextDirection}textDirectionAt(e){return!this.state.facet(Ji)||e<this.viewport.from||e>this.viewport.to?this.textDirection:(this.readMeasured(),this.docView.textDirectionAt(e))}get lineWrapping(){return this.viewState.heightOracle.lineWrapping}bidiSpans(e){if(e.length>Uu)return qi(e.length);let t=this.textDirectionAt(e.from),n;for(let o of this.bidiCache)if(o.from==e.from&&o.dir==t&&(o.fresh||Ui(o.isolates,n=Xi(this,e))))return o.order;n||(n=Xi(this,e));let i=Os(e.text,t,n);return this.bidiCache.push(new Ur(e.from,e.to,t,n,!0,i)),i}get 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ge.define(()=>({}),{eventObservers:e})}static{this.inputHandler=hr}static{this.clipboardInputFilter=hn}static{this.clipboardOutputFilter=cn}static{this.scrollHandler=dr}static{this.focusChangeEffect=cr}static{this.perLineTextDirection=Ji}static{this.exceptionSink=ji}static{this.updateListener=ur}static{this.editable=ce}static{this.mouseSelectionStyle=ar}static{this.dragMovesSelection=lr}static{this.clickAddsSelectionRange=sr}static{this.decorations=St}static{this.blockWrappers=pr}static{this.outerDecorations=Ut}static{this.atomicRanges=ze}static{this.bidiIsolatedRanges=Yi}static{this.cursorScrollMargin=T.define({combine:e=>{let t=5,n=5;for(let i of e)typeof i=="number"?t=n=i:{x:t,y:n}=i;return{x:t,y:n}}})}static{this.scrollMargins=Qi}static theme(e,t){let n=Pe.newName(),i=[wn.of(n),qt.of(zr(`.${n}`,e))];return t&&t.dark&&i.push(Fr.of(!0)),i}static{this.darkTheme=Fr}static baseTheme(e){return 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i&&(n="Alt-"+n),o&&(n="Ctrl-"+n),l&&(n="Meta-"+n),s&&(n="Shift-"+n),n}function Gr(r,e,t){return e.altKey&&(r="Alt-"+r),e.ctrlKey&&(r="Ctrl-"+r),e.metaKey&&(r="Meta-"+r),t!==!1&&e.shiftKey&&(r="Shift-"+r),r}var $u=ct.default(K.domEventHandlers({keydown(r,e){return Zu(Yu(e.state),r,e,"editor")}})),Do=T.define({enables:$u}),ml=new WeakMap;function Yu(r){let e=r.facet(Do),t=ml.get(e);return t||ml.set(e,t=Qu(e.reduce((n,i)=>n.concat(i),[]))),t}var tt=null,Xu=4e3;function Qu(r,e=ju){let t=Object.create(null),n=Object.create(null),i=(s,l)=>{let a=n[s];if(a==null)n[s]=l;else if(a!=l)throw new Error("Key binding "+s+" is used both as a regular binding and as a multi-stroke prefix")},o=(s,l,a,u,h)=>{let c=t[s]||(t[s]=Object.create(null)),f=l.split(/ (?!$)/).map(p=>Ju(p,e));for(let p=1;p<f.length;p++){let g=f.slice(0,p).join(" ");i(g,!0),c[g]||(c[g]={preventDefault:!0,stopPropagation:!1,run:[b=>{let C=tt={view:b,prefix:g,scope:s};return setTimeout(()=>{tt==C&&(tt=null)},Xu),!0}]})}let m=f.join(" 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o=gl(e);return[new r(t,i.left-o.left,i.top-o.top,null,i.bottom-i.top)]}else return _u(e,t,n)}};function gl(r){let e=r.scrollDOM.getBoundingClientRect();return{left:(r.textDirection==0?e.left:e.right-r.scrollDOM.clientWidth*r.scaleX)-r.scrollDOM.scrollLeft*r.scaleX,top:e.top-r.scrollDOM.scrollTop*r.scaleY}}function pl(r,e,t,n){let i=r.coordsAtPos(e,t*2);if(!i)return n;let o=r.dom.getBoundingClientRect(),s=(i.top+i.bottom)/2,l=r.posAtCoords({x:o.left+1,y:s}),a=r.posAtCoords({x:o.right-1,y:s});return l==null||a==null?n:{from:Math.max(n.from,Math.min(l,a)),to:Math.min(n.to,Math.max(l,a))}}function _u(r,e,t){if(t.to<=r.viewport.from||t.from>=r.viewport.to)return[];let n=Math.max(t.from,r.viewport.from),i=Math.min(t.to,r.viewport.to),o=r.textDirection==0,s=r.contentDOM,l=s.getBoundingClientRect(),a=gl(r),u=s.querySelector(".cm-line"),h=u&&window.getComputedStyle(u),c=l.left+(h?parseInt(h.paddingLeft)+Math.min(0,parseInt(h.textIndent)):0),f=l.right-(h?parseInt(h.paddingRight):0),m=Tr(r,n,1),d=Tr(r,i,-1),p=m.type==0?m:null,g=d.type==0?d:null;if(p&&(r.lineWrapping||m.widgetLineBreaks)&&(p=pl(r,n,1,p)),g&&(r.lineWrapping||d.widgetLineBreaks)&&(g=pl(r,i,-1,g)),p&&g&&p.from==g.from&&p.to==g.to)return C(v(t.from,t.to,p));{let w=p?v(t.from,null,p):M(m,!1),x=g?v(null,t.to,g):M(d,!0),k=[];return(p||m).to<(g||d).from-(p&&g?1:0)||m.widgetLineBreaks>1&&w.bottom+r.defaultLineHeight/2<x.top?k.push(b(c,w.bottom,f,x.top)):w.bottom<x.top&&r.elementAtHeight((w.bottom+x.top)/2).type==0&&(w.bottom=x.top=(w.bottom+x.top)/2),C(w).concat(k).concat(C(x))}function b(w,x,k,B){return new nt(e,w-a.left,x-a.top,Math.max(0,k-w),B-x)}function C({top:w,bottom:x,horizontal:k}){let 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Bo=class{constructor(e,t){this.view=e;this.layer=t;this.drawn=[];this.scaleX=1;this.scaleY=1;this.measureReq={read:this.measure.bind(this),write:this.draw.bind(this)},this.dom=e.scrollDOM.appendChild(document.createElement("div")),this.dom.classList.add("cm-layer"),t.above&&this.dom.classList.add("cm-layer-above"),t.class&&this.dom.classList.add(t.class),this.scale(),this.dom.setAttribute("aria-hidden","true"),this.setOrder(e.state),e.requestMeasure(this.measureReq),t.mount&&t.mount(this.dom,e)}update(e){e.startState.facet(jr)!=e.state.facet(jr)&&this.setOrder(e.state),(this.layer.update(e,this.dom)||e.geometryChanged)&&(this.scale(),e.view.requestMeasure(this.measureReq))}docViewUpdate(e){this.layer.updateOnDocViewUpdate!==!1&&e.requestMeasure(this.measureReq)}setOrder(e){let t=0,n=e.facet(jr);for(;t<n.length&&n[t]!=this.layer;)t++;this.dom.style.zIndex=String((this.layer.above?150:-1)-t)}measure(){return 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o?r=r.addChanges(o,s,l,t,e):e.selection&&(r=r.addSelection(e.startState.selection,s,l,t.newGroupDelay)),(i=="full"||i=="after")&&(r=r.isolate()),r},toJSON(r){return{done:r.done.map(e=>e.toJSON()),undone:r.undone.map(e=>e.toJSON())}},fromJSON(r){return new Rn(r.done.map(Be.fromJSON),r.undone.map(Be.fromJSON))}});function Kl(r={}){return[Jo,zl.of(r),K.domEventHandlers({beforeinput(e,t){let n=e.inputType=="historyUndo"?ri:e.inputType=="historyRedo"?On:null;return n?(e.preventDefault(),n(t)):!1}})]}function ni(r,e){return function({state:t,dispatch:n}){if(!e&&t.readOnly)return!1;let i=t.field(Jo,!1);if(!i)return!1;let o=i.pop(r,t,e);return o?(n(o),!0):!1}}var ri=ni(0,!1),On=ni(1,!1),Ul=ni(0,!0),ql=ni(1,!0);function Gl(r){return function(e){let t=e.field(Jo,!1);if(!t)return 0;let n=r==0?t.done:t.undone;return n.length-(n.length&&!n[0].changes?1:0)}}var Mh=Gl(0),Eh=Gl(1),Be=class 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o=this.done.length?this.done[this.done.length-1].selectionsAfter:we;return o.length>0&&t-this.prevTime<i&&n==this.prevUserEvent&&n&&/^select($|\.)/.test(n)&&Dh(o[o.length-1],e)?this:new r(Jl(this.done,e),this.undone,t,n)}addMapping(e){return new r(qo(this.done,e),qo(this.undone,e),this.prevTime,this.prevUserEvent)}pop(e,t,n){let i=e==0?this.done:this.undone;if(i.length==0)return null;let o=i[i.length-1],s=o.selectionsAfter[0]||(o.startSelection?o.startSelection.map(o.changes.invertedDesc,1):t.selection);if(n&&o.selectionsAfter.length)return t.update({selection:o.selectionsAfter[o.selectionsAfter.length-1],annotations:Go.of({side:e,rest:Rh(i),selection:s}),userEvent:e==0?"select.undo":"select.redo",scrollIntoView:!0});if(o.changes){let l=i.length==1?we:i.slice(0,i.length-1);return 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sa(r,e){return Oe(r,t=>t.empty?r.moveByGroup(t,e):oi(t,e))}var Ih=r=>sa(r,!Q(r)),Nh=r=>sa(r,Q(r));var Zy=typeof Intl<"u"&&Intl.Segmenter?new Intl.Segmenter(void 0,{granularity:"word"}):null;function Ph(r,e,t){if(e.type.prop(t))return!0;let n=e.to-e.from;return n&&(n>2||/[^\s,.;:]/.test(r.sliceDoc(e.from,e.to)))||e.firstChild}function si(r,e,t){let n=Se(r).resolveInner(e.head),i=t?H.closedBy:H.openedBy;for(let a=e.head;;){let u=t?n.childAfter(a):n.childBefore(a);if(!u)break;Ph(r,u,i)?n=u:a=t?u.to:u.from}let o=n.type.prop(i),s,l;return o&&(s=t?Te(r,n.from,1):Te(r,n.to,-1))&&s.matched?l=t?s.end.to:s.end.from:l=t?n.to:n.from,y.cursor(l,t?-1:1)}var Vh=r=>Oe(r,e=>si(r.state,e,!Q(r))),Hh=r=>Oe(r,e=>si(r.state,e,Q(r)));function la(r,e){return Oe(r,t=>{if(!t.empty)return oi(t,e);let n=r.moveVertically(t,e);return n.head!=t.head?n:r.moveToLineBoundary(t,e)})}var aa=r=>la(r,!1),ua=r=>la(r,!0);function ha(r){let e=r.scrollDOM.clientHeight<r.scrollDOM.scrollHeight-2,t=0,n=0,i;if(e){for(let o of r.state.facet(K.scrollMargins)){let s=o(r);s?.top&&(t=Math.max(s?.top,t)),s?.bottom&&(n=Math.max(s?.bottom,n))}i=r.scrollDOM.clientHeight-t-n}else i=(r.dom.ownerDocument.defaultView||window).innerHeight;return{marginTop:t,marginBottom:n,selfScroll:e,height:Math.max(r.defaultLineHeight,i-5)}}function ca(r,e){let t=ha(r),{state:n}=r,i=Zt(n.selection,s=>s.empty?r.moveVertically(s,e,t.height):oi(s,e));if(i.eq(n.selection))return!1;let o;if(t.selfScroll){let s=r.coordsAtPos(n.selection.main.head),l=r.scrollDOM.getBoundingClientRect(),a=l.top+t.marginTop,u=l.bottom-t.marginBottom;s&&s.top>a&&s.bottom<u&&(o=K.scrollIntoView(i.main.head,{y:"start",yMargin:s.top-a}))}return r.dispatch(Re(n,i),{effects:o}),!0}var Yl=r=>ca(r,!1),$o=r=>ca(r,!0);function it(r,e,t){let n=r.lineBlockAt(e.head),i=r.moveToLineBoundary(e,t);if(i.head==e.head&&i.head!=(t?n.to:n.from)&&(i=r.moveToLineBoundary(e,t,!1)),!t&&i.head==n.from&&n.length){let o=/^\s*/.exec(r.state.sliceDoc(n.from,Math.min(n.from+100,n.to)))[0].length;o&&e.head!=n.from+o&&(i=y.cursor(n.from+o))}return i}var Fh=r=>Oe(r,e=>it(r,e,!0)),Wh=r=>Oe(r,e=>it(r,e,!1)),zh=r=>Oe(r,e=>it(r,e,!Q(r))),Kh=r=>Oe(r,e=>it(r,e,Q(r))),Uh=r=>Oe(r,e=>y.cursor(r.lineBlockAt(e.head).from,1)),qh=r=>Oe(r,e=>y.cursor(r.lineBlockAt(e.head).to,-1));function Gh(r,e,t){let n=!1,i=Zt(r.selection,o=>{let s=Te(r,o.head,-1)||Te(r,o.head,1)||o.head>0&&Te(r,o.head-1,1)||o.head<r.doc.length&&Te(r,o.head+1,-1);if(!s||!s.end)return o;n=!0;let l=s.start.from==o.head?s.end.to:s.end.from;return t?y.range(o.anchor,l):y.cursor(l)});return n?(e(Re(r,i)),!0):!1}var jh=({state:r,dispatch:e})=>Gh(r,e,!1);function Ce(r,e){let t=Zt(r.state.selection,n=>{let i=e(n);return y.range(n.anchor,i.head,i.goalColumn,i.bidiLevel||void 0,i.assoc)});return t.eq(r.state.selection)?!1:(r.dispatch(Re(r.state,t)),!0)}function fa(r,e){return Ce(r,t=>r.moveByChar(t,e))}var da=r=>fa(r,!Q(r)),ma=r=>fa(r,Q(r));function pa(r,e){return Ce(r,t=>r.moveByGroup(t,e))}var Jh=r=>pa(r,!Q(r)),$h=r=>pa(r,Q(r));var Yh=r=>Ce(r,e=>si(r.state,e,!Q(r))),Xh=r=>Ce(r,e=>si(r.state,e,Q(r)));function ga(r,e){return Ce(r,t=>r.moveVertically(t,e))}var ba=r=>ga(r,!1),ya=r=>ga(r,!0);function xa(r,e){return Ce(r,t=>r.moveVertically(t,e,ha(r).height))}var Xl=r=>xa(r,!1),Ql=r=>xa(r,!0),Qh=r=>Ce(r,e=>it(r,e,!0)),Zh=r=>Ce(r,e=>it(r,e,!1)),_h=r=>Ce(r,e=>it(r,e,!Q(r))),ec=r=>Ce(r,e=>it(r,e,Q(r))),tc=r=>Ce(r,e=>y.cursor(r.lineBlockAt(e.head).from)),nc=r=>Ce(r,e=>y.cursor(r.lineBlockAt(e.head).to)),Zl=({state:r,dispatch:e})=>(e(Re(r,{anchor:0})),!0),_l=({state:r,dispatch:e})=>(e(Re(r,{anchor:r.doc.length})),!0),ea=({state:r,dispatch:e})=>(e(Re(r,{anchor:r.selection.main.anchor,head:0})),!0),ta=({state:r,dispatch:e})=>(e(Re(r,{anchor:r.selection.main.anchor,head:r.doc.length})),!0),rc=({state:r,dispatch:e})=>(e(r.update({selection:{anchor:0,head:r.doc.length},userEvent:"select"})),!0),ic=({state:r,dispatch:e})=>{let t=li(r).map(({from:n,to:i})=>y.range(n,Math.min(i+1,r.doc.length)));return e(r.update({selection:y.create(t),userEvent:"select"})),!0},oc=({state:r,dispatch:e})=>{let t=Zt(r.selection,n=>{let i=Se(r),o=i.resolveStack(n.from,1);if(n.empty){let s=i.resolveStack(n.from,-1);s.node.from>=o.node.from&&s.node.to<=o.node.to&&(o=s)}for(let s=o;s;s=s.next){let{node:l}=s;if((l.from<n.from&&l.to>=n.to||l.to>n.to&&l.from<=n.from)&&s.next)return y.range(l.to,l.from)}return n});return t.eq(r.selection)?!1:(e(Re(r,t)),!0)};function Sa(r,e){let{state:t}=r,n=t.selection,i=t.selection.ranges.slice();for(let o of t.selection.ranges){let s=t.doc.lineAt(o.head);if(e?s.to<r.state.doc.length:s.from>0)for(let l=o;;){let a=r.moveVertically(l,e);if(a.head<s.from||a.head>s.to){i.some(u=>u.head==a.head)||i.push(a);break}else{if(a.head==l.head)break;l=a}}}return i.length==n.ranges.length?!1:(r.dispatch(Re(t,y.create(i,i.length-1))),!0)}var sc=r=>Sa(r,!1),lc=r=>Sa(r,!0),ac=({state:r,dispatch:e})=>{let t=r.selection,n=null;return t.ranges.length>1?n=y.create([t.main]):t.main.empty||(n=y.create([y.cursor(t.main.head)])),n?(e(Re(r,n)),!0):!1};function Ln(r,e){if(r.state.readOnly)return!1;let t="delete.selection",{state:n}=r,i=n.changeByRange(o=>{let{from:s,to:l}=o;if(s==l){let a=e(o);a<s?(t="delete.backward",a=ii(r,a,!1)):a>s&&(t="delete.forward",a=ii(r,a,!0)),s=Math.min(s,a),l=Math.max(l,a)}else s=ii(r,s,!1),l=ii(r,l,!0);return s==l?{range:o}:{changes:{from:s,to:l},range:y.cursor(s,s<o.head?-1:1)}});return i.changes.empty?!1:(r.dispatch(n.update(i,{scrollIntoView:!0,userEvent:t,effects:t=="delete.selection"?K.announce.of(n.phrase("Selection deleted")):void 0})),!0)}function ii(r,e,t){if(r instanceof K)for(let n of r.state.facet(K.atomicRanges).map(i=>i(r)))n.between(e,e,(i,o)=>{i<e&&o>e&&(e=t?o:i)});return e}var Ta=(r,e,t)=>Ln(r,n=>{let i=n.from,{state:o}=r,s=o.doc.lineAt(i),l,a;if(t&&!e&&i>s.from&&i<s.from+200&&!/[^ \t]/.test(l=s.text.slice(0,i-s.from))){if(l[l.length-1]=="	")return i-1;let u=pt(l,o.tabSize),h=u%Xt(o)||Xt(o);for(let c=0;c<h&&l[l.length-1-c]==" ";c++)i--;a=i}else a=z(s.text,i-s.from,e,e)+s.from,a==i&&s.number!=(e?o.doc.lines:1)?a+=e?1:-1:!e&&/[\ufe00-\ufe0f]/.test(s.text.slice(a-s.from,i-s.from))&&(a=z(s.text,a-s.from,!1,!1)+s.from);return a}),Yo=r=>Ta(r,!1,!0);var wa=r=>Ta(r,!0,!1),Ca=(r,e)=>Ln(r,t=>{let n=t.head,{state:i}=r,o=i.doc.lineAt(n),s=i.charCategorizer(n);for(let l=null;;){if(n==(e?o.to:o.from)){n==t.head&&o.number!=(e?i.doc.lines:1)&&(n+=e?1:-1);break}let a=z(o.text,n-o.from,e)+o.from,u=o.text.slice(Math.min(n,a)-o.from,Math.max(n,a)-o.from),h=s(u);if(l!=null&&h!=l)break;(u!=" "||n!=t.head)&&(l=h),n=a}return n}),ka=r=>Ca(r,!1),uc=r=>Ca(r,!0);var hc=r=>Ln(r,e=>{let t=r.lineBlockAt(e.head).to;return e.head<t?t:Math.min(r.state.doc.length,e.head+1)});var cc=r=>Ln(r,e=>{let t=r.moveToLineBoundary(e,!1).head;return e.head>t?t:Math.max(0,e.head-1)}),fc=r=>Ln(r,e=>{let t=r.moveToLineBoundary(e,!0).head;return e.head<t?t:Math.min(r.state.doc.length,e.head+1)});var dc=({state:r,dispatch:e})=>{if(r.readOnly)return!1;let t=r.changeByRange(n=>({changes:{from:n.from,to:n.to,insert:A.of(["",""])},range:y.cursor(n.from)}));return e(r.update(t,{scrollIntoView:!0,userEvent:"input"})),!0},mc=({state:r,dispatch:e})=>{if(r.readOnly)return!1;let t=r.changeByRange(n=>{if(!n.empty||n.from==0||n.from==r.doc.length)return{range:n};let i=n.from,o=r.doc.lineAt(i),s=i==o.from?i-1:z(o.text,i-o.from,!1)+o.from,l=i==o.to?i+1:z(o.text,i-o.from,!0)+o.from;return{changes:{from:s,to:l,insert:r.doc.slice(i,l).append(r.doc.slice(s,i))},range:y.cursor(l)}});return t.changes.empty?!1:(e(r.update(t,{scrollIntoView:!0,userEvent:"move.character"})),!0)};function li(r){let e=[],t=-1;for(let n of r.selection.ranges){let i=r.doc.lineAt(n.from),o=r.doc.lineAt(n.to);if(!n.empty&&n.to==o.from&&(o=r.doc.lineAt(n.to-1)),t>=i.number){let s=e[e.length-1];s.to=o.to,s.ranges.push(n)}else e.push({from:i.from,to:o.to,ranges:[n]});t=o.number+1}return e}function va(r,e,t){if(r.readOnly)return!1;let n=[],i=[];for(let o of li(r)){if(t?o.to==r.doc.length:o.from==0)continue;let s=r.doc.lineAt(t?o.to+1:o.from-1),l=s.length+1;if(t){n.push({from:o.to,to:s.to},{from:o.from,insert:s.text+r.lineBreak});for(let a of o.ranges)i.push(y.range(Math.min(r.doc.length,a.anchor+l),Math.min(r.doc.length,a.head+l)))}else{n.push({from:s.from,to:o.from},{from:o.to,insert:r.lineBreak+s.text});for(let a of o.ranges)i.push(y.range(a.anchor-l,a.head-l))}}return n.length?(e(r.update({changes:n,scrollIntoView:!0,selection:y.create(i,r.selection.mainIndex),userEvent:"move.line"})),!0):!1}var pc=({state:r,dispatch:e})=>va(r,e,!1),gc=({state:r,dispatch:e})=>va(r,e,!0);function Ma(r,e,t){if(r.readOnly)return!1;let n=[];for(let o of li(r))t?n.push({from:o.from,insert:r.doc.slice(o.from,o.to)+r.lineBreak}):n.push({from:o.to,insert:r.lineBreak+r.doc.slice(o.from,o.to)});let i=r.changes(n);return e(r.update({changes:i,selection:r.selection.map(i,t?1:-1),scrollIntoView:!0,userEvent:"input.copyline"})),!0}var bc=({state:r,dispatch:e})=>Ma(r,e,!1),yc=({state:r,dispatch:e})=>Ma(r,e,!0),xc=r=>{if(r.state.readOnly)return!1;let{state:e}=r,t=e.changes(li(e).map(({from:i,to:o})=>(i>0?i--:o<e.doc.length&&o++,{from:i,to:o}))),n=Zt(e.selection,i=>{let o;if(r.lineWrapping){let s=r.lineBlockAt(i.head),l=r.coordsAtPos(i.head,i.assoc||1);l&&(o=s.bottom+r.documentTop-l.bottom+r.defaultLineHeight/2)}return r.moveVertically(i,!0,o)}).map(t);return r.dispatch({changes:t,selection:n,scrollIntoView:!0,userEvent:"delete.line"}),!0},Sc=({state:r,dispatch:e})=>(e(r.update(r.replaceSelection(r.lineBreak),{scrollIntoView:!0,userEvent:"input"})),!0);function Tc(r,e){if(/\(\)|\[\]|\{\}/.test(r.sliceDoc(e-1,e+1)))return{from:e,to:e};let t=Se(r).resolveInner(e),n=t.childBefore(e),i=t.childAfter(e),o;return n&&i&&n.to<=e&&i.from>=e&&(o=n.type.prop(H.closedBy))&&o.indexOf(i.name)>-1&&r.doc.lineAt(n.to).from==r.doc.lineAt(i.from).from&&!/\S/.test(r.sliceDoc(n.to,i.from))?{from:n.to,to:i.from}:null}var na=Ea(!1),wc=Ea(!0);function Ea(r){return({state:e,dispatch:t})=>{if(e.readOnly)return!1;let n=e.changeByRange(i=>{let{from:o,to:s}=i,l=e.doc.lineAt(o),a=!r&&o==s&&Tc(e,o);r&&(o=s=(s<=l.to?l:e.doc.lineAt(s)).to);let u=new rt(e,{simulateBreak:o,simulateDoubleBreak:!!a}),h=_r(u,o);for(h==null&&(h=pt(/^\s*/.exec(e.doc.lineAt(o).text)[0],e.tabSize));s<l.to&&/\s/.test(l.text[s-l.from]);)s++;a?{from:o,to:s}=a:o>l.from&&o<l.from+100&&!/\S/.test(l.text.slice(0,o))&&(o=l.from);let c=["",Qt(e,h)];return a&&c.push(Qt(e,u.lineIndent(l.from,-1))),{changes:{from:o,to:s,insert:A.of(c)},range:y.cursor(o+1+c[1].length)}});return t(e.update(n,{scrollIntoView:!0,userEvent:"input"})),!0}}function Xo(r,e){let t=-1;return r.changeByRange(n=>{let i=[];for(let s=n.from;s<=n.to;){let l=r.doc.lineAt(s);l.number>t&&(n.empty||n.to>l.from)&&(e(l,i,n),t=l.number),s=l.to+1}let o=r.changes(i);return{changes:i,range:y.range(o.mapPos(n.anchor,1),o.mapPos(n.head,1))}})}var Cc=({state:r,dispatch:e})=>{if(r.readOnly)return!1;let t=Object.create(null),n=new rt(r,{overrideIndentation:o=>{let s=t[o];return s??-1}}),i=Xo(r,(o,s,l)=>{let a=_r(n,o.from);if(a==null)return;/\S/.test(o.text)||(a=0);let u=/^\s*/.exec(o.text)[0],h=Qt(r,a);(u!=h||l.from<o.from+u.length)&&(t[o.from]=a,s.push({from:o.from,to:o.from+u.length,insert:h}))});return i.changes.empty||e(r.update(i,{userEvent:"indent"})),!0},kc=({state:r,dispatch:e})=>r.readOnly?!1:(e(r.update(Xo(r,(t,n)=>{n.push({from:t.from,insert:r.facet(Dn)})}),{userEvent:"input.indent"})),!0),vc=({state:r,dispatch:e})=>r.readOnly?!1:(e(r.update(Xo(r,(t,n)=>{let i=/^\s*/.exec(t.text)[0];if(!i)return;let o=pt(i,r.tabSize),s=0,l=Qt(r,Math.max(0,o-Xt(r)));for(;s<i.length&&s<l.length&&i.charCodeAt(s)==l.charCodeAt(s);)s++;n.push({from:t.from+s,to:t.from+i.length,insert:l.slice(s)})}),{userEvent:"delete.dedent"})),!0),Mc=r=>(r.setTabFocusMode(),!0);var Ec=[{key:"Ctrl-b",run:ia,shift:da,preventDefault:!0},{key:"Ctrl-f",run:oa,shift:ma},{key:"Ctrl-p",run:aa,shift:ba},{key:"Ctrl-n",run:ua,shift:ya},{key:"Ctrl-a",run:Uh,shift:tc},{key:"Ctrl-e",run:qh,shift:nc},{key:"Ctrl-d",run:wa},{key:"Ctrl-h",run:Yo},{key:"Ctrl-k",run:hc},{key:"Ctrl-Alt-h",run:ka},{key:"Ctrl-o",run:dc},{key:"Ctrl-t",run:mc},{key:"Ctrl-v",run:$o}],Aa=[{key:"ArrowLeft",run:ia,shift:da,preventDefault:!0},{key:"Mod-ArrowLeft",mac:"Alt-ArrowLeft",run:Ih,shift:Jh,preventDefault:!0},{mac:"Cmd-ArrowLeft",run:zh,shift:_h,preventDefault:!0},{key:"ArrowRight",run:oa,shift:ma,preventDefault:!0},{key:"Mod-ArrowRight",mac:"Alt-ArrowRight",run:Nh,shift:$h,preventDefault:!0},{mac:"Cmd-ArrowRight",run:Kh,shift:ec,preventDefault:!0},{key:"ArrowUp",run:aa,shift:ba,preventDefault:!0},{mac:"Cmd-ArrowUp",run:Zl,shift:ea},{mac:"Ctrl-ArrowUp",run:Yl,shift:Xl},{key:"ArrowDown",run:ua,shift:ya,preventDefault:!0},{mac:"Cmd-ArrowDown",run:_l,shift:ta},{mac:"Ctrl-ArrowDown",run:$o,shift:Ql},{key:"PageUp",run:Yl,shift:Xl},{key:"PageDown",run:$o,shift:Ql},{key:"Home",run:Wh,shift:Zh,preventDefault:!0},{key:"Mod-Home",run:Zl,shift:ea},{key:"End",run:Fh,shift:Qh,preventDefault:!0},{key:"Mod-End",run:_l,shift:ta},{key:"Enter",run:na,shift:na},{key:"Mod-a",run:rc},{key:"Backspace",run:Yo,shift:Yo,preventDefault:!0},{key:"Delete",run:wa,preventDefault:!0},{key:"Mod-Backspace",mac:"Alt-Backspace",run:ka,preventDefault:!0},{key:"Mod-Delete",mac:"Alt-Delete",run:uc,preventDefault:!0},{mac:"Mod-Backspace",run:cc,preventDefault:!0},{mac:"Mod-Delete",run:fc,preventDefault:!0}].concat(Ec.map(r=>({mac:r.key,run:r.run,shift:r.shift}))),_y=[{key:"Alt-ArrowLeft",mac:"Ctrl-ArrowLeft",run:Vh,shift:Yh},{key:"Alt-ArrowRight",mac:"Ctrl-ArrowRight",run:Hh,shift:Xh},{key:"Alt-ArrowUp",run:pc},{key:"Shift-Alt-ArrowUp",run:bc},{key:"Alt-ArrowDown",run:gc},{key:"Shift-Alt-ArrowDown",run:yc},{key:"Mod-Alt-ArrowUp",run:sc},{key:"Mod-Alt-ArrowDown",run:lc},{key:"Escape",run:ac},{key:"Mod-Enter",run:wc},{key:"Alt-l",mac:"Ctrl-l",run:ic},{key:"Mod-i",run:oc,preventDefault:!0},{key:"Mod-[",run:vc},{key:"Mod-]",run:kc},{key:"Mod-Alt-\\",run:Cc},{key:"Shift-Mod-k",run:xc},{key:"Shift-Mod-\\",run:jh},{key:"Mod-/",run:Hl},{key:"Alt-A",run:Fl},{key:"Ctrl-m",mac:"Shift-Alt-m",run:Mc}].concat(Aa);export{ht as Compartment,V as Decoration,y as EditorSelection,j as EditorState,K as EditorView,W as StateEffect,se as StateField,X as Transaction,ke as WidgetType,yl as drawSelection,Kl as history,$l as historyKeymap,Sc as insertNewline,jo as isolateHistory,Do as keymap,On as redo,Aa as standardKeymap,ri as undo};
diff --git a/ext/demo-site/dist/definition-inspector.js b/ext/demo-site/dist/definition-inspector.js
@@ -1,23 +1,9 @@
-import { tokenize } from './syntax.js';
+export { definitionSites } from './syntax.js';
 import { outputType, valueText } from './codecs.js';
 import { interpretationLabels } from './auto-interpretation.js';
-// Decoration only. The runtime resolves names; this never parses executable code.
-export function definitionSites(source) {
-    const seen = new Set();
-    return tokenize(source).filter(token => {
-        if (token.kind !== 'definition' || token.start > 0 && source[token.start - 1] !== '\n' || seen.has(token.text))
-            return false;
-        seen.add(token.text);
-        return true;
-    }).map(token => ({ name: token.text, start: token.start }));
-}
 export { valueText as inspectionText } from './codecs.js';
 export function definitionInspector(input, request, io) {
-    const wrapper = input.parentElement;
-    wrapper.classList.add('has-definition-inspector');
-    const targets = document.createElement('div');
-    targets.className = 'definition-targets';
-    wrapper.append(targets);
+    const wrapper = input.dom;
     const card = document.createElement('section');
     card.className = 'definition-card';
     card.hidden = true;
@@ -136,138 +122,104 @@ export function definitionInspector(input, request, io) {
     clear();
     let selected, source = '', ready = false, busy = false, serial = 0;
     let pending, last = '', generation = 0, wasReady = false, scheduled = false;
-    const buttons = new Map();
-    const declarationIndices = new Map();
-    const fragments = new Map();
+    let published;
+    const wired = new WeakSet();
     function selectName(name) {
-        if (busy || input.disabled || wrapper.classList.contains('composing'))
-            return;
-        const site = definitionSites(input.value).find(site => site.name === name);
-        if (!site)
+        if (busy || input.isDisabled || input.isReadOnly || wrapper.classList.contains('composing'))
             return;
-        hide();
-        input.focus({ preventScroll: true });
-        input.setSelectionRange(site.start, site.start + site.name.length);
-        input.dispatchEvent(new Event('select'));
+        const site = input.declarations().find(site => site.name === name);
+        if (site) {
+            hide();
+            input.select(site.start, site.start + site.name.length);
+        }
     }
-    function makeTarget(name) {
-        const button = document.createElement('button');
-        button.type = 'button';
-        button.textContent = name;
-        button.dataset.definition = name;
-        button.setAttribute('aria-label', `Inspect compiled definition ${name}`);
-        button.setAttribute('aria-controls', card.id);
-        button.setAttribute('aria-expanded', String(selected === name));
+    function wireTarget(target) {
+        if (wired.has(target))
+            return;
+        wired.add(target);
+        const name = () => target.dataset.definition ?? '';
+        const enabled = () => ready && !busy && target.matches('.definition-name[aria-disabled="false"]') && !wrapper.classList.contains('composing');
         let gesture;
         let hold;
-        const cancelHold = () => { clearTimeout(hold); hold = undefined; };
-        button.onpointerdown = event => {
-            cancelHold();
+        const cancel = () => { clearTimeout(hold); hold = undefined; };
+        target.onpointerdown = event => {
+            cancel();
             const current = { x: event.clientX, y: event.clientY, time: performance.now(), cancelled: false, moved: false, touch: event.pointerType === 'touch' || event.pointerType === 'pen' };
             gesture = current;
-            if (current.touch)
-                hold = setTimeout(() => {
-                    if (gesture === current && !current.cancelled) {
-                        current.cancelled = true;
-                        if (button.isConnected && !button.disabled && !button.hidden)
-                            selectName(name);
-                    }
-                }, 500);
-        };
-        button.onpointermove = event => {
-            if (gesture && Math.hypot(event.clientX - gesture.x, event.clientY - gesture.y) > 8) {
-                gesture.cancelled = gesture.moved = true;
-                cancelHold();
+            // Short taps inspect; holds select the identifier for editing. Pointer
+            // cancellation preserves native scrolling.
+            if (current.touch) {
+                event.preventDefault();
+                hold = setTimeout(() => { if (gesture === current && !current.cancelled && enabled()) {
+                    current.cancelled = true;
+                    selectName(name());
+                } }, 500);
             }
         };
-        button.onpointerup = () => {
-            cancelHold();
-            // Repeat selection in the release's user gesture: mobile keyboard focus
-            // must not depend solely on a timer callback's transient activation.
-            if (gesture?.touch && !gesture.moved && performance.now() - gesture.time >= 500 && button.isConnected && !button.disabled && !button.hidden) {
-                gesture.cancelled = true;
-                selectName(name);
-            }
-        };
-        // Touch generates a compatibility mousedown on release. After a hold it
-        // must not steal focus back from the textarea selection we just created.
-        button.onmousedown = event => { if (gesture?.touch && gesture.cancelled && !gesture.moved)
-            event.preventDefault(); };
-        button.onpointercancel = () => { if (gesture)
-            gesture.cancelled = true; cancelHold(); };
-        button.oncontextmenu = () => {
-            cancelHold();
-            if (gesture) {
-                if (gesture.touch && !gesture.moved && button.isConnected && !button.disabled && !button.hidden)
-                    selectName(name);
-                gesture.cancelled = true;
-            }
-        };
-        button.onclick = event => {
-            cancelHold();
+        target.onpointermove = event => { if (gesture && Math.hypot(event.clientX - gesture.x, event.clientY - gesture.y) > 8) {
+            gesture.cancelled = gesture.moved = true;
+            cancel();
+        } };
+        target.onpointerup = () => { cancel(); if (gesture?.touch && !gesture.moved && performance.now() - gesture.time >= 500 && enabled()) {
+            gesture.cancelled = true;
+            selectName(name());
+        } };
+        target.onpointercancel = () => { if (gesture)
+            gesture.cancelled = true; cancel(); };
+        target.oncontextmenu = () => { cancel(); if (gesture) {
+            if (gesture.touch && !gesture.moved && enabled())
+                selectName(name());
+            gesture.cancelled = true;
+        } };
+        target.onclick = event => {
+            cancel();
+            if (event.detail && gesture && (gesture.cancelled || performance.now() - gesture.time > 500))
+                return;
+            if (!enabled())
+                return;
             const selection = document.getSelection();
-            if (event.detail && (gesture && (gesture.cancelled || performance.now() - gesture.time > 500) ||
-                selection && !selection.isCollapsed && (button.contains(selection.anchorNode) || button.contains(selection.focusNode))))
+            if (event.detail > 1)
                 return;
-            if (ready && !busy && !wrapper.classList.contains('composing')) {
-                choose(name);
-                if (!event.detail && !card.hidden)
-                    result.focus({ preventScroll: true });
-            }
+            // Touch gesture state distinguishes taps, holds and pans even when the
+            // browser retains a previous DOM selection.
+            if (event.detail && !gesture?.touch && selection && !selection.isCollapsed && (target.contains(selection.anchorNode) || target.contains(selection.focusNode)))
+                return;
+            choose(name());
+            if (!card.hidden)
+                result.focus({ preventScroll: true });
         };
-        targets.append(button);
-        return button;
-    }
-    function position() {
-        const mirror = wrapper.querySelector('.syntax-viewport pre');
-        if (!mirror)
-            return;
-        const declarations = [...mirror.querySelectorAll('.syntax-definition')];
-        const rect = targets.getBoundingClientRect();
-        const style = getComputedStyle(input), visibleHeight = input.clientHeight;
-        const height = Math.max(1, Number.parseFloat(style.lineHeight) - 2), font = style.font;
-        // Read text geometry before writing overlay styles (no per-name layout flush).
-        const geometry = new Map([...buttons.keys()].map(name => {
-            const span = declarations[declarationIndices.get(name) ?? -1];
-            return [name, span ? [...span.getClientRects()] : []];
-        }));
-        for (const [name, primary] of buttons) {
-            const boxes = geometry.get(name);
-            const group = fragments.get(name);
-            // A wrapped identifier has separate hit areas, never a large bounding
-            // rectangle that also intercepts the expression beside its last line.
-            while (group.length < boxes.length) {
-                const button = makeTarget(name);
-                group[group.length - 1].after(button);
-                group.push(button);
-            }
-            let tabStop = false;
-            for (let i = 0; i < group.length; i++) {
-                const button = group[i], text = boxes[i];
-                button.disabled = primary.disabled;
-                button.title = primary.title;
-                button.setAttribute('aria-expanded', String(selected === name && !card.hidden));
-                const top = text ? text.top + text.height / 2 - rect.top - height / 2 : -100;
-                button.hidden = (primary.disabled && !(ready && selected === name && !card.hidden)) || !text || top < 0 || top + height > visibleHeight;
-                button.tabIndex = !button.hidden && !button.disabled && !tabStop ? 0 : -1;
-                if (button.tabIndex === 0)
-                    tabStop = true;
-                if (text) {
-                    button.style.top = `${top}px`;
-                    button.style.left = `${text.left - rect.left}px`;
-                    button.style.width = `${text.width}px`;
-                    button.style.height = `${height}px`;
-                    button.style.font = font;
+        target.addEventListener('keydown', event => {
+            if (['Enter', ' '].includes(event.key)) {
+                event.preventDefault();
+                event.stopPropagation();
+                if (enabled()) {
+                    choose(name());
+                    if (!card.hidden)
+                        result.focus({ preventScroll: true });
                 }
             }
-        }
-        edit.hidden = input.hidden || !selected || !buttons.has(selected);
-        edit.disabled = busy || input.disabled || input.readOnly;
-        edit.title = input.readOnly ? 'This source is read-only.' : 'Select the declaration name in the editor.';
-        card.style.maxHeight = `${input.hidden ? Math.min(540, innerHeight * .75) : Math.min(input.clientHeight - 16, innerHeight * .75, ioDetected ? 540 : 260)}px`;
-        if (selected && !card.hidden && !input.hidden) {
-            const top = Number.parseFloat(buttons.get(selected)?.style.top ?? '0') + height + 4;
-            card.style.top = `${Math.max(8, Math.min(top, input.clientHeight - card.offsetHeight - 8))}px`;
+            if (event.key === 'Escape') {
+                event.preventDefault();
+                event.stopPropagation();
+                hide();
+            }
+        }, true);
+    }
+    function position() {
+        input.setDefinitions({ ready, busy, ...(selected && !card.hidden ? { selected } : {}), ...(published ? { published } : {}) });
+        for (const target of wrapper.querySelectorAll('.definition-name'))
+            wireTarget(target);
+        const available = selected && input.declarations().some(site => site.name === selected);
+        edit.hidden = input.dom.hidden || !available;
+        edit.disabled = busy || input.isDisabled || input.isReadOnly;
+        edit.title = input.isReadOnly ? 'This source is read-only.' : 'Select the declaration name in the editor.';
+        const height = input.dom.clientHeight;
+        card.style.maxHeight = `${input.dom.hidden ? Math.min(540, innerHeight * .75) : Math.min(height - 16, innerHeight * .75, ioDetected ? 540 : 260)}px`;
+        if (selected && !card.hidden && !input.dom.hidden) {
+            const site = input.declarations().find(site => site.name === selected);
+            const rect = site ? input.view.coordsAtPos(site.start + site.name.length) : null;
+            const top = rect ? rect.bottom - wrapper.getBoundingClientRect().top + 4 : 8;
+            card.style.top = `${Math.max(8, Math.min(top, height - card.offsetHeight - 8))}px`;
         }
     }
     function inspect() {
@@ -309,8 +261,6 @@ export function definitionInspector(input, request, io) {
         card.hidden = false;
         last = '';
         result.textContent = '';
-        for (const [key, button] of buttons)
-            button.setAttribute('aria-expanded', String(key === name));
         position();
         schedule();
     }
@@ -320,23 +270,26 @@ export function definitionInspector(input, request, io) {
         const name = selected;
         selected = undefined;
         card.hidden = true;
-        for (const button of targets.querySelectorAll('button'))
-            button.setAttribute('aria-expanded', 'false');
-        const target = fragments.get(name ?? '')?.find(button => !button.hidden && !button.disabled);
-        (target ?? (busy ? document.getElementById('stop') : undefined))?.focus({ preventScroll: true });
+        position();
+        const target = [...wrapper.querySelectorAll('.definition-name')].find(target => target.dataset.definition === name && target.getAttribute('aria-disabled') === 'false');
+        if (target)
+            target.focus({ preventScroll: true });
+        else if (busy)
+            document.getElementById('stop')?.focus({ preventScroll: true });
     }
     close.onclick = hide;
     card.addEventListener('keydown', event => { if (event.key === 'Escape') {
         event.preventDefault();
         hide();
     } });
-    edit.onclick = () => { if (selected && !input.readOnly)
+    edit.onclick = () => { if (selected && !input.isReadOnly)
         selectName(selected); };
     format.onchange = () => { suspended = false; last = ''; schedule(); };
     function update(current, working, publishedNames) {
         ready = current;
         busy = working;
-        if (!input.hidden && card.parentElement !== wrapper) {
+        published = publishedNames;
+        if (!input.dom.hidden && card.parentElement !== wrapper) {
             wrapper.append(card);
             card.classList.remove('external-definition');
         }
@@ -345,23 +298,12 @@ export function definitionInspector(input, request, io) {
             last = '';
         }
         wasReady = ready;
-        if (source !== input.value) {
+        if (source !== input.getSource()) {
             ioDetected = false;
             ioPanel.hidden = true;
             clear();
-            source = input.value;
-            targets.replaceChildren();
-            buttons.clear();
-            fragments.clear();
-            declarationIndices.clear();
-            const declarations = tokenize(source).filter(token => token.kind === 'definition');
-            for (const site of definitionSites(source)) {
-                declarationIndices.set(site.name, declarations.findIndex(token => token.start === site.start));
-                const button = makeTarget(site.name);
-                buttons.set(site.name, button);
-                fragments.set(site.name, [button]);
-            }
-            if (selected && !buttons.has(selected)) {
+            source = input.getSource();
+            if (selected && !input.declarations().some(site => site.name === selected)) {
                 selected = undefined;
                 card.hidden = true;
                 result.textContent = '';
@@ -374,12 +316,6 @@ export function definitionInspector(input, request, io) {
             card.hidden = true;
             result.textContent = '';
         }
-        targets.hidden = input.hidden;
-        for (const [name, button] of buttons) {
-            const available = !publishedNames || publishedNames.includes(name);
-            button.disabled = !ready || busy || !available;
-            button.title = available ? `Inspect ${name}` : `${name} is private in this published package. Edit source to compile locally.`;
-        }
         format.disabled = !ready || busy;
         run.disabled = !ready || busy || !ioDetected;
         stop.disabled = !ioRunning;
@@ -399,12 +335,10 @@ export function definitionInspector(input, request, io) {
         position();
         schedule();
     }
-    input.addEventListener('scroll', position, { passive: true });
-    new ResizeObserver(position).observe(input);
+    input.onLayout(position);
     new ResizeObserver(position).observe(card);
-    new MutationObserver(position).observe(wrapper.querySelector('.syntax-viewport'), { childList: true, subtree: true });
     return {
-        open(name) { card.classList.toggle('external-definition', input.hidden); if (input.hidden) {
+        open(name) { card.classList.toggle('external-definition', input.dom.hidden); if (input.dom.hidden) {
             card.style.top = '';
             document.getElementById('package-definition-view').append(card);
         }
@@ -438,11 +372,9 @@ export function definitionInspector(input, request, io) {
             }
             position();
         },
-        // Stop is an explicit suspension, not an invitation to re-observe a divergent
-        // binding automatically as soon as the same source is compiled again.
+        // Stop suspends observation until the user reopens the definition.
         stopped(message, suspend = false) { suspended = suspend; ioRunning = false; inputForm.hidden = true; next.disabled = true; stop.disabled = true; status.textContent = message; },
-        reset() { suspended = false; ioRunning = false; ioDetected = false; ioPanel.hidden = true; clear(); selected = undefined; pending = undefined; last = ''; card.hidden = true; result.textContent = ''; for (const button of targets.querySelectorAll('button'))
-            button.setAttribute('aria-expanded', 'false'); },
+        reset() { suspended = false; ioRunning = false; ioDetected = false; ioPanel.hidden = true; clear(); selected = undefined; pending = undefined; last = ''; card.hidden = true; result.textContent = ''; position(); },
         update,
         reply(message) {
             if (message.id !== pending)
diff --git a/ext/demo-site/dist/import-folds.js b/ext/demo-site/dist/import-folds.js
@@ -0,0 +1,109 @@
+// Hash decorations project canonical UTF-16 document ranges. Editing a revealed
+// hash uses ordinary character-level selection and deletion.
+import { StateField, StateEffect, Transaction, EditorSelection, EditorView, Decoration, WidgetType } from './codemirror.js';
+import { tokenize } from './syntax.js';
+const cachedSites = new WeakMap();
+export function importSites(state) {
+    const cached = cachedSites.get(state.doc);
+    if (cached)
+        return cached;
+    const source = state.doc.toString();
+    const sites = tokenize(source).filter(token => token.kind === 'directive' && token.text === '!import').flatMap(token => {
+        const line = state.doc.lineAt(token.start);
+        if (source.slice(line.from, token.start).trim())
+            return [];
+        const match = /^[ \t]+([a-f0-9]{64})(?=[ \t\r\n]|$)/.exec(source.slice(token.end));
+        if (!match)
+            return [];
+        const from = token.end + match[0].length - 64;
+        return [{ from, to: from + 64, hash: match[1], line: line.number }];
+    });
+    cachedSites.set(state.doc, sites);
+    return sites;
+}
+export const importFocus = StateEffect.define();
+const toggle = StateEffect.define();
+const short = (hash) => hash.slice(0, 3) + '...' + hash.slice(-3);
+class ImportHash extends WidgetType {
+    site;
+    expanded;
+    constructor(site, expanded) {
+        super();
+        this.site = site;
+        this.expanded = expanded;
+    }
+    eq(other) { return this.site.from === other.site.from && this.site.hash === other.site.hash && this.expanded === other.expanded; }
+    toDOM(view) {
+        const button = document.createElement('button');
+        button.type = 'button';
+        button.className = 'import-hash';
+        button.textContent = this.expanded ? this.site.hash : short(this.site.hash);
+        button.dataset.hashFrom = String(this.site.from);
+        button.setAttribute('aria-expanded', String(this.expanded));
+        button.setAttribute('aria-label', `${this.expanded ? 'Collapse' : 'Expand'} import hash ${this.site.hash}`);
+        button.onclick = () => {
+            view.dispatch({ effects: toggle.of(this.site.from), annotations: Transaction.addToHistory.of(false) });
+            view.dom.querySelector(`[data-hash-from="${this.site.from}"]`)?.focus({ preventScroll: true });
+        };
+        // Ctrl+A on a hash control selects the complete canonical program.
+        button.onkeydown = event => {
+            if ((event.ctrlKey || event.metaKey) && event.key.toLowerCase() === 'a') {
+                event.preventDefault();
+                view.dispatch({ selection: EditorSelection.single(0, view.state.doc.length), effects: importFocus.of(true) });
+                view.focus();
+            }
+        };
+        return button;
+    }
+    ignoreEvent() { return true; }
+}
+export function selectedImportLines(state, active) {
+    const lines = new Set();
+    for (const range of state.selection.ranges) {
+        if (!active && range.empty)
+            continue;
+        const from = state.doc.lineAt(range.from).number, to = state.doc.lineAt(range.empty ? range.to : Math.max(range.from, range.to - 1)).number;
+        for (let line = from; line <= to; line++)
+            lines.add(line);
+    }
+    return lines;
+}
+function decorate(state, open, active) {
+    const sites = importSites(state), selected = selectedImportLines(state, active), ranges = [];
+    for (const site of sites)
+        ranges.push((selected.has(site.line) ? Decoration.mark({ class: 'import-hash-full' }) :
+            Decoration.replace({ widget: new ImportHash(site, open.has(site.from)) })).range(site.from, site.to));
+    return { open, active, sites, decorations: Decoration.set(ranges, true) };
+}
+export const importFolds = StateField.define({
+    create: state => decorate(state, new Set(), false),
+    update: (old, tr) => {
+        let active = old.active;
+        const open = tr.docChanged ? new Set(old.sites.filter(site => old.open.has(site.from) && !tr.changes.touchesRange(site.from, site.to))
+            .map(site => tr.changes.mapPos(site.from, 1))) : new Set(old.open);
+        if (tr.selection && tr.isUserEvent('select'))
+            active = true;
+        for (const effect of tr.effects) {
+            if (effect.is(toggle)) {
+                if (open.has(effect.value))
+                    open.delete(effect.value);
+                else
+                    open.add(effect.value);
+            }
+            if (effect.is(importFocus))
+                active = effect.value;
+        }
+        if (!tr.docChanged && !tr.selection && active === old.active && open.size === old.open.size && [...open].every(pos => old.open.has(pos)))
+            return old;
+        return decorate(tr.state, open, active);
+    },
+    provide: field => EditorView.decorations.from(field, value => value.decorations)
+});
+export function syncImportFocus(view) {
+    queueMicrotask(() => {
+        const old = view.state.field(importFolds).active, element = view.dom.ownerDocument.activeElement;
+        const active = element === view.contentDOM ? true : view.dom.contains(element) ? old : false;
+        if (old !== active)
+            view.dispatch({ effects: importFocus.of(active), annotations: Transaction.addToHistory.of(false) });
+    });
+}
diff --git a/ext/demo-site/dist/import-picker.js b/ext/demo-site/dist/import-picker.js
@@ -183,7 +183,7 @@ export function importPicker(options) {
     open.onclick = () => {
         if (!options.available())
             return;
-        snapshot = options.source.value;
+        snapshot = options.source.getSource();
         backend = options.backend();
         search.value = '';
         dialog.showModal();
@@ -227,7 +227,7 @@ export function importPicker(options) {
     };
     get('copy-import').onclick = () => { void navigator.clipboard.writeText(statement()).then(() => message('Import copied.'), () => message('Select and copy the import preview.')); };
     function applyPlan() {
-        if (!plan || !options.available() || options.source.value !== snapshot || options.backend() !== backend) {
+        if (!plan || !options.available() || options.source.getSource() !== snapshot || options.backend() !== backend) {
             stop();
             insert.disabled = true;
             message('The editor changed. Close and reopen the picker to use the current source.');
@@ -237,17 +237,11 @@ export function importPicker(options) {
         finish();
         options.source.focus();
         if (checked.existing) {
-            options.source.setSelectionRange(checked.existing.start, checked.existing.end);
+            options.source.select(checked.existing.start, checked.existing.end);
             return;
         }
-        // Native textarea editing supplies one undo transaction on supported browsers.
-        options.source.setSelectionRange(0, 0);
-        if (!document.execCommand('insertText', false, checked.statement)) {
-            message('Your browser could not insert an undoable edit. Copy the import from the picker.');
-            dialog.showModal();
-            return;
-        }
-        options.source.setSelectionRange(0, checked.statement.length);
+        options.source.edit(0, 0, checked.statement);
+        options.source.select(0, checked.statement.length);
     }
     insert.onclick = () => applyPlan();
     return { cancel: () => { if (dialog.open)
diff --git a/ext/demo-site/dist/source-editor.js b/ext/demo-site/dist/source-editor.js
@@ -0,0 +1,177 @@
+import { importFolds, importFocus, importSites, syncImportFocus } from './import-folds.js';
+import { EditorState, StateField, StateEffect, Transaction, EditorSelection, Compartment, EditorView, Decoration, keymap, drawSelection, history, historyKeymap, standardKeymap, isolateHistory, undo, redo, insertNewline } from './codemirror.js';
+import { tokenize, bracketPair, definitionSites } from './syntax.js';
+// Enter inserts a plain newline, preserving explicit source indentation.
+const plainNewline = (view) => !view.state.readOnly && insertNewline(view);
+const definitions = StateEffect.define();
+const definitionState = StateField.define({
+    create: () => ({ ready: false, busy: false }),
+    update: (old, tr) => { for (const effect of tr.effects)
+        if (effect.is(definitions))
+            return effect.value; return old; }
+});
+const presentations = new WeakMap();
+function presentation(state) {
+    let cached = presentations.get(state.doc);
+    if (!cached) {
+        const source = state.doc.toString(), tokens = tokenize(source);
+        cached = { tokens, sites: definitionSites(source, tokens) };
+        presentations.set(state.doc, cached);
+    }
+    return cached;
+}
+function decorations(state) {
+    const { tokens, sites } = presentation(state), selection = state.selection.main;
+    const pair = selection.empty ? bracketPair(tokens, selection.head) : [];
+    const marks = [], imports = importSites(state);
+    for (const token of tokens)
+        if (token.kind && !imports.some(site => token.start >= site.from && token.end <= site.to)) {
+            const match = pair.includes(token.start) ? pair.length === 2 ? ' bracket-match' : ' bracket-unmatched' : '';
+            marks.push(Decoration.mark({ class: `syntax-${token.kind}${match}` }).range(token.start, token.end));
+        }
+    const controls = state.field(definitionState);
+    if (controls.ready)
+        for (const site of sites) {
+            if (controls.published && !controls.published.includes(site.name) || controls.busy && controls.selected !== site.name)
+                continue;
+            marks.push(Decoration.mark({ class: 'definition-name', attributes: {
+                    role: 'button', tabindex: controls.busy ? '-1' : '0', 'data-definition': site.name,
+                    'aria-label': `Inspect compiled definition ${site.name}`, 'aria-controls': 'inline-definition',
+                    'aria-expanded': String(controls.selected === site.name), 'aria-disabled': String(controls.busy)
+                } }).range(site.start, site.start + site.name.length));
+        }
+    return Decoration.set(marks, true);
+}
+const syntax = StateField.define({
+    create: decorations,
+    update: (old, tr) => tr.docChanged || tr.selection || tr.effects.some(effect => effect.is(definitions)) ? decorations(tr.state) : old,
+    provide: field => EditorView.decorations.from(field)
+});
+// Symbol.for shares the mounted component across independently bundled test
+// and application entrypoints.
+const editorKey = Symbol.for('tricu.source-editor');
+// Controller and browser fixtures access the same EditorState document,
+// selection and history through the mounted component.
+export function editorFor(element) {
+    const editor = element[editorKey];
+    if (!editor)
+        throw Error('Source editor is not initialized');
+    return editor;
+}
+export class SourceEditor {
+    dom;
+    view;
+    configuration;
+    currentDefinitions = { ready: false, busy: false };
+    availability = new Compartment();
+    changes = new Set();
+    layouts = new Set();
+    locked = false;
+    readonlySource = false;
+    controls = '';
+    pendingEpoch;
+    epoch = 0;
+    constructor(dom) {
+        this.dom = dom;
+        dom.classList.add('source-editor');
+        this.configuration = [
+            definitionState, syntax, importFolds, history(), drawSelection(), EditorState.tabSize.of(2),
+            keymap.of([{ key: 'Enter', run: plainNewline, shift: plainNewline }, ...historyKeymap, ...standardKeymap]), EditorView.lineWrapping,
+            this.availability.of([EditorState.readOnly.of(false), EditorView.editable.of(true)]),
+            EditorView.domEventHandlers({ focus: (_event, view) => syncImportFocus(view), blur: (_event, view) => syncImportFocus(view) }),
+            EditorView.contentAttributes.of({ 'aria-label': 'tricu source (up to 16,384 characters)', spellcheck: 'false', autocorrect: 'off', autocapitalize: 'off' }),
+            EditorView.updateListener.of(update => {
+                if (update.docChanged)
+                    this.notify();
+                // Schedule external listeners after EditorView.update so controller
+                // effects can dispatch their own transactions.
+                queueMicrotask(() => { for (const listener of this.layouts)
+                    listener(); });
+            }),
+            EditorView.theme({ '&': { height: '100%' }, '.cm-scroller': { overflow: 'auto', fontFamily: 'inherit', lineHeight: 'inherit' },
+                '.cm-content': { padding: '18px 20px', fontFamily: 'inherit', fontVariantLigatures: 'none', minHeight: '100%' },
+                '.cm-line': { padding: '0' }, '.cm-cursor': { borderLeftColor: 'var(--syntax-ink)' },
+                '.cm-selectionBackground, &.cm-focused .cm-selectionBackground': { background: '#799ea066' } })
+        ];
+        this.view = new EditorView({ parent: dom, state: EditorState.create({ extensions: this.configuration }) });
+        this.view.scrollDOM.addEventListener('scroll', () => { for (const listener of this.layouts)
+            listener(); }, { passive: true });
+        new ResizeObserver(() => { for (const listener of this.layouts)
+            listener(); }).observe(dom);
+        dom.addEventListener('compositionstart', () => dom.classList.add('composing'));
+        dom.addEventListener('compositionend', () => dom.classList.remove('composing'));
+        dom[editorKey] = this;
+    }
+    notify() {
+        const epoch = this.epoch;
+        if (this.pendingEpoch === epoch)
+            return;
+        this.pendingEpoch = epoch;
+        queueMicrotask(() => { if (this.pendingEpoch === epoch)
+            this.flushChange(); });
+    }
+    // Controller edits notify after the view update returns; native-input edits
+    // notify at the microtask boundary. Both refresh revisions before the next
+    // user event. Document epochs discard notifications from previous loads.
+    flushChange() {
+        if (this.pendingEpoch !== this.epoch)
+            return;
+        this.pendingEpoch = undefined;
+        for (const listener of this.changes)
+            listener();
+    }
+    undo() { const result = undo(this.view); this.flushChange(); return result; }
+    redo() { const result = redo(this.view); this.flushChange(); return result; }
+    getSource() { return this.view.state.doc.toString(); }
+    getSelection() { const { from, to } = this.view.state.selection.main; return { from, to }; }
+    focus() { this.view.focus(); }
+    declarations() { return presentation(this.view.state).sites; }
+    revealDefinition(name) {
+        const site = this.declarations().find(site => site.name === name);
+        if (!site)
+            return false;
+        this.view.dispatch({ effects: EditorView.scrollIntoView(site.start, { y: 'center' }) });
+        return true;
+    }
+    select(from, to = from) { this.view.dispatch({ selection: EditorSelection.single(from, to), effects: importFocus.of(true), scrollIntoView: true }); this.focus(); }
+    // Loading/restoring documents retires old history; import insertion is a
+    // separate, isolated undoable edit. Notification is explicit for controller edits.
+    replaceSource(source, notify = false) {
+        this.epoch++;
+        this.pendingEpoch = undefined;
+        const state = EditorState.create({ doc: source, extensions: this.configuration });
+        this.view.setState(state.update({ effects: [definitions.of(this.currentDefinitions),
+                this.availability.reconfigure([EditorState.readOnly.of(this.locked || this.readonlySource), EditorView.editable.of(!this.locked && !this.readonlySource)])] }).state);
+        if (notify) {
+            this.pendingEpoch = this.epoch;
+            this.flushChange();
+        }
+    }
+    edit(from, to, text) {
+        this.view.dispatch({ changes: { from, to, insert: text }, selection: EditorSelection.single(from + text.length),
+            annotations: [Transaction.userEvent.of('input'), isolateHistory.of('full')] });
+        this.focus();
+        this.flushChange();
+    }
+    get isDisabled() { return this.locked; }
+    get isReadOnly() { return this.readonlySource; }
+    setAvailability(disabled, readOnly) {
+        if (this.locked === disabled && this.readonlySource === readOnly)
+            return;
+        this.locked = disabled;
+        this.readonlySource = readOnly;
+        this.dom.classList.toggle('disabled', disabled);
+        this.view.dispatch({ effects: this.availability.reconfigure([EditorState.readOnly.of(disabled || readOnly), EditorView.editable.of(!disabled && !readOnly)]) });
+    }
+    setDefinitions(value) {
+        const key = JSON.stringify(value);
+        if (key === this.controls)
+            return;
+        this.controls = key;
+        this.currentDefinitions = value;
+        this.view.dispatch({ effects: definitions.of(value) });
+    }
+    onChange(listener) { this.changes.add(listener); return () => this.changes.delete(listener); }
+    onLayout(listener) { this.layouts.add(listener); }
+    refresh() { this.view.requestMeasure(); }
+}
diff --git a/ext/demo-site/dist/syntax.js b/ext/demo-site/dist/syntax.js
@@ -146,55 +146,13 @@ export function paintSyntax(target, tokens, pair = []) {
     }
     target.replaceChildren(fragment);
 }
-export function syntaxEditor(input) {
-    const wrapper = document.createElement('div');
-    wrapper.className = 'syntax-editor';
-    input.before(wrapper);
-    wrapper.append(input);
-    const viewport = document.createElement('div');
-    viewport.className = 'syntax-viewport';
-    viewport.setAttribute('aria-hidden', 'true');
-    const mirror = document.createElement('pre');
-    viewport.append(mirror);
-    wrapper.prepend(viewport);
-    let value, tokens = [], lastPair = '', composing = false;
-    function scroll() { mirror.style.transform = `translate(${-input.scrollLeft}px, ${-input.scrollTop}px)`; }
-    function refresh() {
-        wrapper.hidden = input.hidden;
-        wrapper.classList.toggle('modified', input.classList.contains('modified'));
-        wrapper.classList.toggle('disabled', input.disabled);
-        wrapper.classList.toggle('composing', composing);
-        const style = getComputedStyle(input);
-        // Use the textarea's actual content box, excluding scrollbar and border.
-        mirror.style.width = `${input.clientWidth}px`;
-        viewport.style.inset = `${style.borderTopWidth} ${style.borderRightWidth} ${style.borderBottomWidth} ${style.borderLeftWidth}`;
-        for (const property of ['font-family', 'font-size', 'line-height', 'font-weight', 'font-style', 'font-stretch', 'font-variant-ligatures', 'font-kerning', 'font-feature-settings', 'font-variation-settings', 'letter-spacing', 'padding', 'tab-size', 'text-align'])
-            mirror.style.setProperty(property, style.getPropertyValue(property));
-        const changed = value !== input.value;
-        if (changed) {
-            value = input.value;
-            tokens = tokenize(value);
-        }
-        const pair = !composing && document.activeElement === input && input.selectionStart === input.selectionEnd ? bracketPair(tokens, input.selectionStart) : [];
-        if (changed || pair.join() !== lastPair) {
-            paintSyntax(mirror, tokens, pair);
-            lastPair = pair.join();
-            // Preserve a trailing empty line without introducing a new line.
-            if (!value || value.endsWith('\n'))
-                mirror.append(document.createTextNode(' '));
-        }
-        scroll();
-    }
-    input.classList.add('syntax-input');
-    for (const event of ['input', 'click', 'keyup', 'select', 'focus', 'blur'])
-        input.addEventListener(event, refresh);
-    input.addEventListener('compositionstart', () => { composing = true; refresh(); });
-    input.addEventListener('compositionend', () => { composing = false; refresh(); });
-    input.addEventListener('scroll', scroll, { passive: true });
-    document.addEventListener('selectionchange', () => { if (document.activeElement === input)
-        refresh(); });
-    new ResizeObserver(refresh).observe(input);
-    new MutationObserver(refresh).observe(input, { attributes: true, attributeFilter: ['hidden', 'disabled', 'class'] });
-    refresh();
-    return refresh;
+// Unique top-level declaration heads recognized by lexical layout.
+export function definitionSites(source, tokens = tokenize(source)) {
+    const seen = new Set();
+    return tokens.filter(token => {
+        if (token.kind !== 'definition' || token.start > 0 && source[token.start - 1] !== '\n' || seen.has(token.text))
+            return false;
+        seen.add(token.text);
+        return true;
+    }).map(token => ({ name: token.text, start: token.start }));
 }
diff --git a/ext/demo-site/index.html b/ext/demo-site/index.html
@@ -52,8 +52,8 @@
         <div class="source-heading"><h2 id="source-title">Source</h2><span id="source-label">tricu / stable</span></div>
         <p id="playground-intro" class="hint" hidden><strong>Try the Playground:</strong> click an underlined definition name to inspect its compiled tree and choose an interpretation. Write calls as source definitions. IO programs offer an explicit <strong>Run IO</strong> button inside their card.</p>
         <p id="authorship">Published package</p><p id="source-availability" class="hint" hidden></p>
-        <label class="sr-only" for="source-editor">tricu source (up to 16,384 characters)</label>
-        <textarea id="source-editor" rows="18" maxlength="32768" spellcheck="false" autocapitalize="off" autocorrect="off" hidden></textarea>
+        <label class="sr-only" id="source-editor-label">tricu source (up to 16,384 characters)</label>
+        <div id="source-editor" hidden></div>
         <pre id="source-notes"><code id="source">Loading Names and values…</code></pre>
         <section id="package-definitions" hidden><label for="package-definition-search">Search stored definitions</label><input id="package-definition-search" type="search"><div id="package-definition-list"></div><div id="package-definition-view"></div></section>
         <p id="operation-diagnostic" class="error" role="status" hidden></p>
diff --git a/ext/demo-site/javascript.nix b/ext/demo-site/javascript.nix
@@ -0,0 +1,24 @@
+{ pkgs }:
+let
+  editor = import ./codemirror { inherit pkgs; };
+  lock = builtins.fromJSON (builtins.readFile ./codemirror/sources.json);
+  paths = builtins.listToAttrs (map (row: {
+    name = row.name;
+    value = [ (if pkgs.lib.hasSuffix ".js" row.entry
+      then "${editor}/deps/${row.slug}/${pkgs.lib.removeSuffix ".js" row.entry}.d.ts"
+      else "${editor}/types/${row.slug}/${pkgs.lib.removeSuffix ".ts" row.entry}.d.ts") ];
+  }) lock);
+in pkgs.runCommand "arboricx-site-javascript" { nativeBuildInputs = [pkgs.typescript pkgs.python3]; } ''
+  cp -r ${./src} src
+  cp ${./tsconfig.json} tsconfig.json
+  cat > build.json <<'JSON'
+  {"extends":"./tsconfig.json","compilerOptions":{"paths":${builtins.toJSON paths},"skipLibCheck":true}}
+  JSON
+  tsc -p build.json
+  cp ${editor}/codemirror.js dist/
+  for file in ${editor}/licenses/*.txt; do
+    printf '\n--- %s ---\n' "$(basename "$file")"
+    cat "$file"
+  done > dist/codemirror.LICENSE.txt
+  cp -r dist $out
+''
diff --git a/ext/demo-site/release.nix b/ext/demo-site/release.nix
@@ -11,6 +11,7 @@ let
         "images" "compiler.json" "packages.json" "environments.json" "tsconfig.json"
       ];
   };
+  javascript = import ./javascript.nix { inherit pkgs; };
   artwork = import ./artwork.nix { inherit pkgs; };
   dependencies = pkgs.runCommand "arboricx-site-deps" {
     nativeBuildInputs = [ pkgs.python3 pkgs.makeWrapper ];
@@ -30,7 +31,7 @@ let
     passthru.dependencies = dependencies;
   } ''
     cd ${siteSource}
-    tsc -p tsconfig.json --outDir "$TMPDIR/dist"
+    cp -r ${javascript} "$TMPDIR/dist"
     diff -ru dist "$TMPDIR/dist"
     mkdir -p $out
     cp index.html style.css theme.js catalogue.json compiler.json packages.json environments.json $out/
@@ -39,6 +40,7 @@ let
       cmp images/$name ${artwork}/$name
     done
     cp -r "$TMPDIR/dist" $out/dist
+    chmod -R u+w $out/dist
     # JS evaluator drivers/checkpoints are conformance tools, not a site backend.
     rm -r $out/dist/conformance
     mkdir -p $out/runtime/zig
diff --git a/ext/demo-site/src/app.ts b/ext/demo-site/src/app.ts
@@ -1,8 +1,9 @@
+import { SourceEditor } from './source-editor.js';
 import { definitionInspector } from './definition-inspector.js';
 import { exampleGroups, exampleGroup, libraryLabel } from './program-catalogue.js';
 import { importPicker } from './import-picker.js';
 import { localModulesUI } from './local-modules-ui.js';
-import { syntaxEditor, tokenize, paintSyntax } from './syntax.js';
+import { tokenize, paintSyntax } from './syntax.js';
 import { backend, backends, runtimeStats, type Backend } from './runtime-backends.js';
 import { setupInspector } from './inspector.js';
 import { ActiveClock } from './clock.js';
@@ -16,7 +17,7 @@ import type { CompilerMessage } from './compiler-protocol.js';
 function el<T extends HTMLElement = HTMLElement>(id: string): T {
   const element = document.getElementById(id); if (!element) throw new Error(`Missing element ${id}`); return element as T;
 }
-const sourceEditor = el<HTMLTextAreaElement>('source-editor'), refreshSourceSyntax = syntaxEditor(sourceEditor);
+const sourceEditor = new SourceEditor(el('source-editor'));
 const compileButton = el<HTMLButtonElement>('compile'), restoreButton = el<HTMLButtonElement>('restore-source');
 const downloadButton = el<HTMLButtonElement>('download-bundle'), exportModuleButton = el<HTMLButtonElement>('export-compiled-module');
 const backendPicker = el<HTMLSelectElement>('runtime-backend'), programPicker = el<HTMLSelectElement>('program-picker');
@@ -55,7 +56,7 @@ const definitions = definitionInspector(sourceEditor, (id, name, output) => {
   worker.postMessage({ type: 'inspect', id, name, output });
 }, {
   run(name, output, step) {
-    if (busy || !worker || draft && (!compiled || sourceEditor.value !== compiledSource || editRevision !== compiledRevision)) return;
+    if (busy || !worker || draft && (!compiled || sourceEditor.getSource() !== compiledSource || editRevision !== compiledRevision)) return;
     currentName = name; operation = 'running'; controls(true); deadline.reset(Infinity); deadline.start(); diagnostic();
     el('status').textContent = `Running IO · ${name}`;
     worker.postMessage({ type: 'run-io', name, output, step });
@@ -69,11 +70,11 @@ const definitions = definitionInspector(sourceEditor, (id, name, output) => {
   },
 });
 const imports = importPicker({ source: sourceEditor, backend: () => backendPicker.value,
-  available: () => !busy, editable: () => !busy && !sourceEditor.hidden && !sourceEditor.readOnly,
+  available: () => !busy, editable: () => !busy && !sourceEditor.dom.hidden && !sourceEditor.isReadOnly,
   tryLibrary: (library, definition) => { preferredExport = definition; loadBundle(library); },
   local: () => localModules.entries(), inputs: () => localModules.inputs() });
 function diagnostic(message = ''): void { el('operation-diagnostic').textContent = message; el('operation-diagnostic').hidden = !message; }
-function ready(): boolean { return !!worker && (draft ? compiled && sourceEditor.value === compiledSource && editRevision === compiledRevision : loaded); }
+function ready(): boolean { return !!worker && (draft ? compiled && sourceEditor.getSource() === compiledSource && editRevision === compiledRevision : loaded); }
 function controls(working: boolean): void {
   busy = working; localModules.disable(busy);
   backendPicker.disabled = busy; programPicker.disabled = busy || !entries.length;
@@ -83,22 +84,22 @@ function controls(working: boolean): void {
   compileButton.disabled = busy || !draft || ready(); compileButton.hidden = !draft; restoreButton.hidden = !draft;
   restoreButton.disabled = busy || originalSource === undefined;
   exportModuleButton.disabled = busy || !draft || !ready(); downloadButton.disabled = busy || draft || downloadHash() === undefined;
-  sourceEditor.disabled = busy && operation !== 'compiling'; sourceEditor.readOnly = originalSource === undefined && !draft;
-  const editable = !sourceEditor.hidden && (draft || originalSource !== undefined);
+  sourceEditor.setAvailability(busy && operation !== 'compiling', originalSource === undefined && !draft);
+  const editable = !sourceEditor.dom.hidden && (draft || originalSource !== undefined);
   el('playground-intro').hidden = selected?.id !== 'names-values' || !editable;
   el('source-title').textContent = editable ? 'Source' : sourceAvailable ? 'Read-only source' : loaded ? 'Compiled package' : 'Package information';
   el('source-availability').hidden = editable || !loaded;
   el('source-availability').textContent = 'Browse stored definitions below, or import this module into your own source. Inspection does not execute IO.';
-  el('package-definitions').hidden = !loaded || !sourceEditor.hidden;
+  el('package-definitions').hidden = !loaded || !sourceEditor.dom.hidden;
   el<HTMLButtonElement>('reload-package').hidden = draft || !selection || !!worker;
   el<HTMLButtonElement>('stored-download').disabled = busy || draft || !loaded || !worker;
   el<HTMLSelectElement>('stored-definition').disabled = el<HTMLSelectElement>('stored-format').disabled = busy || draft || !loaded;
   el('authorship').textContent = draft ? 'Local draft · your authored code (not published)' : loaded ? 'Published package · verified executable' : 'Published selection · not yet verified';
-  const modified = draft && !ready(); el('authorship').classList.toggle('modified', modified); sourceEditor.classList.toggle('modified', modified);
+  const modified = draft && !ready(); el('authorship').classList.toggle('modified', modified); sourceEditor.dom.classList.toggle('modified', modified);
   for (const button of document.querySelectorAll<HTMLButtonElement>('[data-compiler-example]')) button.disabled = busy;
   stopButton.disabled = !busy && !draft; stopButton.hidden = !busy; shareButton.disabled = busy || draft || !loaded;
   el<HTMLButtonElement>('reset').disabled = busy;
-  refreshSourceSyntax(); definitions.update(!sourceEditor.hidden && ready() || sourceEditor.hidden && loaded && !!worker, busy, draft ? undefined : publishedNames);
+  sourceEditor.refresh(); definitions.update(!sourceEditor.dom.hidden && ready() || sourceEditor.dom.hidden && loaded && !!worker, busy, draft ? undefined : publishedNames);
   for (const button of el('package-definition-list').querySelectorAll<HTMLButtonElement>('button')) button.disabled = busy || !loaded;
 }
 function renderPublishedNames(): void {
@@ -198,12 +199,12 @@ function newWorker(preserveSource = false): void {
     if (publishedNames.includes(currentName)) el<HTMLSelectElement>('stored-definition').value = currentName;
     el('compiler-stats').textContent = 'Published package · no local compilation.';
     el('package-info').textContent = `SHA-256 verified · ${data.nodes.toLocaleString()} stored DAG nodes · ${publishedNames.length} export(s) · ${data.hash}`;
-    if (!preserveSource || originalSource === undefined) { originalSource = selected?.environment !== undefined && data.source !== null ? data.source : undefined; sourceEditor.value = originalSource ?? ''; }
-    sourceEditor.hidden = originalSource === undefined; el('source-notes').hidden = !sourceEditor.hidden;
+    if (!preserveSource || originalSource === undefined) { originalSource = selected?.environment !== undefined && data.source !== null ? data.source : undefined; sourceEditor.replaceSource(originalSource ?? ''); }
+    sourceEditor.dom.hidden = originalSource === undefined; el('source-notes').hidden = !sourceEditor.dom.hidden;
     sourceAvailable = data.source !== null; el('source-label').textContent = sourceAvailable ? 'Curated tricu / stable' : 'Package metadata';
     el('source').textContent = data.source ?? `Verified package metadata\n${JSON.stringify(data.metadata,null,2)}`;
     if (data.source !== null) paintSyntax(el('source'), tokenize(data.source));
-    el<HTMLInputElement>('package-definition-search').value = sourceEditor.hidden && requested && publishedNames.includes(requested) ? requested : ''; renderPublishedNames(); idle(); el('status').textContent = 'Ready';
+    el<HTMLInputElement>('package-definition-search').value = sourceEditor.dom.hidden && requested && publishedNames.includes(requested) ? requested : ''; renderPublishedNames(); idle(); el('status').textContent = 'Ready';
   };
   current.onerror = event => { if (worker === current) { event.preventDefault(); loaded = false; finish(event.message || 'Worker failed.',true); } };
   current.postMessage({type:'load',...selection});
@@ -215,13 +216,13 @@ function selectExample(entry: CatalogueEntry): void {
 function select(entry: CatalogueEntry, release?: Release): void {
   definitions.reset(); draft = scratch = false; originalSource = undefined; sourceAvailable = false;
   dispose(); diagnostic(); loaded = false; selected = entry; publishedNames = [];
-  selection = {hash:entry.hash,localId:entry.id}; hashInput.value = entry.hash; sourceEditor.hidden = true; el('source-notes').hidden = false;
+  selection = {hash:entry.hash,localId:entry.id}; hashInput.value = entry.hash; sourceEditor.dom.hidden = true; el('source-notes').hidden = false;
   const pinned = release ?? releases.find(r=>r.hash===entry.hash&&r.demo===entry.id); chooseProgram(`demo:${entry.id}`,pinned?.version); showRelease(pinned); newWorker();
 }
 function invalidateProgram(): void {
   definitions.reset(); draft = scratch = false; originalSource = undefined; sourceAvailable = false;
   dispose(); diagnostic(); loaded = false; selection = undefined; selected = undefined; publishedNames = [];
-  sourceEditor.hidden = true; el('source-notes').hidden = false; el('source').textContent = 'Load the selected program to inspect its source or package notes.';
+  sourceEditor.dom.hidden = true; el('source-notes').hidden = false; el('source').textContent = 'Load the selected program to inspect its source or package notes.';
   el('package-info').textContent = 'No bundle loaded.'; showRelease(); renderPublishedNames(); controls(false); el('status').textContent = 'Load package';
 }
 function loadBundle(release?: Release): void {
@@ -346,22 +347,22 @@ downloadButton.onclick = () => {
   current.postMessage({ type: 'load', hash });
 };
 
-sourceEditor.addEventListener('compositionstart',()=>{composing=true;cancelIdleCompile();});
-sourceEditor.addEventListener('compositionend',()=>{composing=false;if(draft)queueCompile();});
-sourceEditor.oninput = () => {
+sourceEditor.dom.addEventListener('compositionstart',()=>{composing=true;cancelIdleCompile();});
+sourceEditor.dom.addEventListener('compositionend',()=>{composing=false;if(draft)queueCompile();});
+sourceEditor.onChange(() => {
   if (busy && operation !== 'compiling') return;
   editRevision++; diagnostic(); el('compile-diagnostic').hidden=true;
   if (operation === 'compiling') { draft=true;controls(true);queueCompile();return; }
   if (!worker || !compiled || busy) dispose();
-  draft = compiled || scratch || sourceEditor.value !== originalSource;
+  draft = compiled || scratch || sourceEditor.getSource() !== originalSource;
   controls(false);
   if (!draft && selection) newWorker(true); else {el('status').textContent='Changes pending';queueCompile();}
-};
-restoreButton.onclick=()=>{if(originalSource===undefined||busy)return;dispose();sourceEditor.value=originalSource;sourceEditor.dispatchEvent(new Event('input'));};
+});
+restoreButton.onclick=()=>{if(originalSource===undefined||busy)return;dispose();sourceEditor.replaceSource(originalSource,true);};
 compileButton.onclick=()=>compileDraft();
 function compileDraft(): void {
   if(!draft||busy)return;
-  const snapshot={revision:editRevision,source:sourceEditor.value};dispose();operation='compiling';diagnostic();el('compile-diagnostic').hidden=true;
+  const snapshot={revision:editRevision,source:sourceEditor.getSource()};dispose();operation='compiling';diagnostic();el('compile-diagnostic').hidden=true;
   try {
     sourceText(snapshot.source);const current=new Worker(workerURL(),{type:'module'});worker=current;
     controls(true);deadline.reset(Infinity);deadline.start();el('status').textContent='Compiling';
@@ -391,7 +392,7 @@ for(const button of document.querySelectorAll<HTMLButtonElement>('[data-compiler
   const source=button.dataset['compilerExample']==='module'&&math?`!import ${math.manifest} as N\n!export answer\nanswer = N.add 40 2`:examples[button.dataset['compilerExample'] as keyof typeof examples];
   if(!source)return;
   definitions.reset();dispose();diagnostic();chooseProgram('');scratch=draft=true;originalSource=undefined;loaded=false;selection=undefined;selected=undefined;editRevision++;
-  sourceEditor.hidden=false;el('source-notes').hidden=true;sourceEditor.value=source;controls(false);el('package-info').textContent='Scratch program · no published bundle selected.';showRelease();el('source-label').textContent='Scratch program · explicit modules or contract helpers';el('status').textContent='Changes pending';queueCompile();
+  sourceEditor.dom.hidden=false;el('source-notes').hidden=true;sourceEditor.replaceSource(source);controls(false);el('package-info').textContent='Scratch program · no published bundle selected.';showRelease();el('source-label').textContent='Scratch program · explicit modules or contract helpers';el('status').textContent='Changes pending';queueCompile();
 };
 function loadFragment(): boolean {
   const fragment=new URLSearchParams(location.hash.slice(1)),requested=fragment.get('bundle');if(!requested)return false;
diff --git a/ext/demo-site/src/codemirror.d.ts b/ext/demo-site/src/codemirror.d.ts
@@ -0,0 +1,4 @@
+// Public types for the pinned, locally bundled editor. Resolved by javascript.nix.
+export {EditorState, StateField, StateEffect, Transaction, EditorSelection, Compartment, type Range, type Extension} from '@codemirror/state';
+export {EditorView, Decoration, WidgetType, keymap, drawSelection} from '@codemirror/view';
+export {history, historyKeymap, standardKeymap, isolateHistory, undo, redo, insertNewline} from '@codemirror/commands';
diff --git a/ext/demo-site/src/definition-inspector.ts b/ext/demo-site/src/definition-inspector.ts
@@ -1,4 +1,5 @@
-import { tokenize } from './syntax.js';
+import type { SourceEditor } from './source-editor.js';
+export { definitionSites } from './syntax.js';
 import { outputType, valueText, type OutputType, type ValueView } from './codecs.js';
 import { interpretationLabels, type InspectionFormat } from './auto-interpretation.js';
 import type { WorkerMessage, InspectionReply } from './protocol.js';
@@ -9,19 +10,9 @@ interface IOControls {
   resume(value?: string): void;
 }
 
-// Decoration only. The runtime resolves names; this never parses executable code.
-export function definitionSites(source: string): { name: string; start: number }[] {
-  const seen = new Set<string>();
-  return tokenize(source).filter(token => {
-    if (token.kind !== 'definition' || token.start > 0 && source[token.start - 1] !== '\n' || seen.has(token.text)) return false;
-    seen.add(token.text); return true;
-  }).map(token => ({ name: token.text, start: token.start }));
-}
 export { valueText as inspectionText } from './codecs.js';
-export function definitionInspector(input: HTMLTextAreaElement, request: (id: number, name: string, output: InspectionFormat) => void, io: IOControls) {
-  const wrapper = input.parentElement!;
-  wrapper.classList.add('has-definition-inspector');
-  const targets = document.createElement('div'); targets.className = 'definition-targets'; wrapper.append(targets);
+export function definitionInspector(input: SourceEditor, request: (id: number, name: string, output: InspectionFormat) => void, io: IOControls) {
+  const wrapper = input.dom;
   const card = document.createElement('section'); card.className = 'definition-card'; card.hidden = true;
   card.id = 'inline-definition'; card.setAttribute('aria-label', 'Compiled definition');
   const title = document.createElement('strong'), format = document.createElement('select');
@@ -87,109 +78,59 @@ export function definitionInspector(input: HTMLTextAreaElement, request: (id: nu
   clear();
   let selected: string | undefined, source = '', ready = false, busy = false, serial = 0;
   let pending: number | undefined, last = '', generation = 0, wasReady = false, scheduled = false;
-  const buttons = new Map<string, HTMLButtonElement>();
-  const declarationIndices = new Map<string, number>();
-  const fragments = new Map<string, HTMLButtonElement[]>();
+  let published:string[]|undefined;
+  const wired = new WeakSet<HTMLElement>();
   function selectName(name: string): void {
-    if (busy || input.disabled || wrapper.classList.contains('composing')) return;
-    const site = definitionSites(input.value).find(site => site.name === name);
-    if (!site) return;
-    hide(); input.focus({ preventScroll: true });
-    input.setSelectionRange(site.start, site.start + site.name.length);
-    input.dispatchEvent(new Event('select'));
+    if (busy || input.isDisabled || input.isReadOnly || wrapper.classList.contains('composing')) return;
+    const site = input.declarations().find(site => site.name === name);
+    if (site) { hide(); input.select(site.start, site.start + site.name.length); }
   }
-  function makeTarget(name: string): HTMLButtonElement {
-    const button = document.createElement('button'); button.type = 'button'; button.textContent = name;
-    button.dataset.definition = name;
-    button.setAttribute('aria-label', `Inspect compiled definition ${name}`);
-    button.setAttribute('aria-controls', card.id); button.setAttribute('aria-expanded', String(selected === name));
-    // Short taps inspect. A touch hold selects the real textarea identifier;
-    // buttons do not acquire native editable-word selection on their own.
-    // Never cancel pointerdown or the context menu, and cancel holds on drags.
-    type Gesture = { x: number; y: number; time: number; cancelled: boolean; moved: boolean; touch: boolean };
-    let gesture: Gesture | undefined;
-    let hold: ReturnType<typeof setTimeout> | undefined;
-    const cancelHold = () => { clearTimeout(hold); hold = undefined; };
-    button.onpointerdown = event => {
-      cancelHold();
-      const current: Gesture = { x: event.clientX, y: event.clientY, time: performance.now(), cancelled: false, moved: false, touch: event.pointerType === 'touch' || event.pointerType === 'pen' };
-      gesture = current;
-      if (current.touch) hold = setTimeout(() => {
-        if (gesture === current && !current.cancelled) { current.cancelled = true; if (button.isConnected && !button.disabled && !button.hidden) selectName(name); }
-      }, 500);
-    };
-    button.onpointermove = event => {
-      if (gesture && Math.hypot(event.clientX - gesture.x, event.clientY - gesture.y) > 8) {
-        gesture.cancelled = gesture.moved = true; cancelHold();
-      }
-    };
-    button.onpointerup = () => {
-      cancelHold();
-      // Repeat selection in the release's user gesture: mobile keyboard focus
-      // must not depend solely on a timer callback's transient activation.
-      if (gesture?.touch && !gesture.moved && performance.now() - gesture.time >= 500 && button.isConnected && !button.disabled && !button.hidden) {
-        gesture.cancelled = true; selectName(name);
-      }
-    };
-    // Touch generates a compatibility mousedown on release. After a hold it
-    // must not steal focus back from the textarea selection we just created.
-    button.onmousedown = event => { if (gesture?.touch && gesture.cancelled && !gesture.moved) event.preventDefault(); };
-    button.onpointercancel = () => { if (gesture) gesture.cancelled = true; cancelHold(); };
-    button.oncontextmenu = () => {
-      cancelHold();
-      if (gesture) { if (gesture.touch && !gesture.moved && button.isConnected && !button.disabled && !button.hidden) selectName(name); gesture.cancelled = true; }
+  function wireTarget(target: HTMLElement): void {
+    if (wired.has(target)) return; wired.add(target);
+    const name = () => target.dataset.definition ?? '';
+    const enabled = () => ready && !busy && target.matches('.definition-name[aria-disabled="false"]') && !wrapper.classList.contains('composing');
+    let gesture: {x:number;y:number;time:number;cancelled:boolean;moved:boolean;touch:boolean}|undefined;
+    let hold:ReturnType<typeof setTimeout>|undefined;
+    const cancel = () => {clearTimeout(hold);hold=undefined;};
+    target.onpointerdown = event => {
+      cancel(); const current={x:event.clientX,y:event.clientY,time:performance.now(),cancelled:false,moved:false,touch:event.pointerType==='touch'||event.pointerType==='pen'}; gesture=current;
+      // Short taps inspect; holds select the identifier for editing. Pointer
+      // cancellation preserves native scrolling.
+      if(current.touch) {event.preventDefault();hold=setTimeout(()=>{if(gesture===current&&!current.cancelled&&enabled()){current.cancelled=true;selectName(name());}},500);}
+
     };
-    button.onclick = event => {
-      cancelHold();
-      const selection = document.getSelection();
-      if (event.detail && (gesture && (gesture.cancelled || performance.now() - gesture.time > 500) ||
-          selection && !selection.isCollapsed && (button.contains(selection.anchorNode) || button.contains(selection.focusNode)))) return;
-      if (ready && !busy && !wrapper.classList.contains('composing')) {
-        choose(name);
-        if (!event.detail && !card.hidden) result.focus({ preventScroll: true });
-      }
+    target.onpointermove = event => {if(gesture&&Math.hypot(event.clientX-gesture.x,event.clientY-gesture.y)>8){gesture.cancelled=gesture.moved=true;cancel();}};
+    target.onpointerup = () => {cancel();if(gesture?.touch&&!gesture.moved&&performance.now()-gesture.time>=500&&enabled()){gesture.cancelled=true;selectName(name());}};
+    target.onpointercancel = () => {if(gesture)gesture.cancelled=true;cancel();};
+    target.oncontextmenu = () => {cancel();if(gesture){if(gesture.touch&&!gesture.moved&&enabled())selectName(name());gesture.cancelled=true;}};
+    target.onclick = event => {
+      cancel(); if(event.detail&&gesture&&(gesture.cancelled||performance.now()-gesture.time>500))return;
+      if(!enabled())return;
+      const selection=document.getSelection();
+      if(event.detail>1)return;
+      // Touch gesture state distinguishes taps, holds and pans even when the
+      // browser retains a previous DOM selection.
+      if(event.detail&&!gesture?.touch&&selection&&!selection.isCollapsed&&(target.contains(selection.anchorNode)||target.contains(selection.focusNode)))return;
+      choose(name());if(!card.hidden)result.focus({preventScroll:true});
     };
-    targets.append(button); return button;
+    target.addEventListener('keydown',event=>{
+      if(['Enter',' '].includes(event.key)){event.preventDefault();event.stopPropagation();if(enabled()){choose(name());if(!card.hidden)result.focus({preventScroll:true});}}
+      if(event.key==='Escape'){event.preventDefault();event.stopPropagation();hide();}
+    },true);
   }
   function position(): void {
-    const mirror = wrapper.querySelector('.syntax-viewport pre'); if (!mirror) return;
-    const declarations = [...mirror.querySelectorAll<HTMLElement>('.syntax-definition')];
-    const rect = targets.getBoundingClientRect();
-    const style = getComputedStyle(input), visibleHeight = input.clientHeight;
-    const height = Math.max(1, Number.parseFloat(style.lineHeight) - 2), font = style.font;
-    // Read text geometry before writing overlay styles (no per-name layout flush).
-    const geometry = new Map([...buttons.keys()].map(name => {
-      const span = declarations[declarationIndices.get(name) ?? -1];
-      return [name, span ? [...span.getClientRects()] : []] as const;
-    }));
-    for (const [name, primary] of buttons) {
-      const boxes = geometry.get(name)!;
-      const group = fragments.get(name)!;
-      // A wrapped identifier has separate hit areas, never a large bounding
-      // rectangle that also intercepts the expression beside its last line.
-      while (group.length < boxes.length) { const button = makeTarget(name); group[group.length - 1]!.after(button); group.push(button); }
-      let tabStop = false;
-      for (let i = 0; i < group.length; i++) {
-        const button = group[i]!, text = boxes[i];
-        button.disabled = primary.disabled; button.title = primary.title;
-        button.setAttribute('aria-expanded', String(selected === name && !card.hidden));
-        const top = text ? text.top + text.height / 2 - rect.top - height / 2 : -100;
-        button.hidden = (primary.disabled && !(ready && selected === name && !card.hidden)) || !text || top < 0 || top + height > visibleHeight;
-        button.tabIndex = !button.hidden && !button.disabled && !tabStop ? 0 : -1;
-        if (button.tabIndex === 0) tabStop = true;
-        if (text) {
-          button.style.top = `${top}px`; button.style.left = `${text.left - rect.left}px`;
-          button.style.width = `${text.width}px`; button.style.height = `${height}px`;
-          button.style.font = font;
-        }
-      }
-    }
-    edit.hidden = input.hidden || !selected || !buttons.has(selected); edit.disabled = busy || input.disabled || input.readOnly;
-    edit.title = input.readOnly ? 'This source is read-only.' : 'Select the declaration name in the editor.';
-    card.style.maxHeight = `${input.hidden ? Math.min(540, innerHeight * .75) : Math.min(input.clientHeight - 16, innerHeight * .75, ioDetected ? 540 : 260)}px`;
-    if (selected && !card.hidden && !input.hidden) {
-      const top = Number.parseFloat(buttons.get(selected)?.style.top ?? '0') + height + 4;
-      card.style.top = `${Math.max(8, Math.min(top, input.clientHeight - card.offsetHeight - 8))}px`;
+    input.setDefinitions({ready,busy,...(selected&&!card.hidden?{selected}:{}),...(published?{published}:{})});
+    for(const target of wrapper.querySelectorAll<HTMLElement>('.definition-name'))wireTarget(target);
+    const available=selected&&input.declarations().some(site=>site.name===selected);
+    edit.hidden = input.dom.hidden || !available; edit.disabled = busy || input.isDisabled || input.isReadOnly;
+    edit.title = input.isReadOnly ? 'This source is read-only.' : 'Select the declaration name in the editor.';
+    const height=input.dom.clientHeight;
+    card.style.maxHeight = `${input.dom.hidden ? Math.min(540,innerHeight*.75) : Math.min(height-16,innerHeight*.75,ioDetected?540:260)}px`;
+    if(selected&&!card.hidden&&!input.dom.hidden){
+      const site=input.declarations().find(site=>site.name===selected);
+      const rect=site?input.view.coordsAtPos(site.start+site.name.length):null;
+      const top=rect?rect.bottom-wrapper.getBoundingClientRect().top+4:8;
+      card.style.top=`${Math.max(8,Math.min(top,height-card.offsetHeight-8))}px`;
     }
   }
   function inspect(): void {
@@ -205,44 +146,34 @@ export function definitionInspector(input: HTMLTextAreaElement, request: (id: nu
   function choose(name: string): void {
     if (selected === name && !card.hidden && !suspended) { hide(); return; }
     selected = name; suspended = false; ioDetected = false; lineInput.value = ''; get('input-error').textContent = ''; inputForm.hidden = true; next.disabled = true; ioPanel.hidden = true; terminal.textContent = ''; trace.replaceChildren(); clear(); format.value = 'auto'; title.textContent = name; card.hidden = false; last = ''; result.textContent = '';
-    for (const [key, button] of buttons) button.setAttribute('aria-expanded', String(key === name));
     position(); schedule();
   }
   function hide(): void {
     if (ioRunning) io.stop();
     const name = selected; selected = undefined; card.hidden = true;
-    for (const button of targets.querySelectorAll('button')) button.setAttribute('aria-expanded', 'false');
-    const target = fragments.get(name ?? '')?.find(button => !button.hidden && !button.disabled);
-    (target ?? (busy ? document.getElementById('stop') : undefined))?.focus({ preventScroll: true });
+    position();
+    const target=[...wrapper.querySelectorAll<HTMLElement>('.definition-name')].find(target=>target.dataset.definition===name&&target.getAttribute('aria-disabled')==='false');
+    if(target)target.focus({preventScroll:true});else if(busy)document.getElementById('stop')?.focus({preventScroll:true});
+
   }
   close.onclick = hide;
   card.addEventListener('keydown', event => { if (event.key === 'Escape') { event.preventDefault(); hide(); } });
-  edit.onclick = () => { if (selected && !input.readOnly) selectName(selected); };
+  edit.onclick = () => { if (selected && !input.isReadOnly) selectName(selected); };
   format.onchange = () => { suspended = false; last = ''; schedule(); };
   function update(current: boolean, working: boolean, publishedNames?: string[]): void {
-    ready = current; busy = working;
-    if (!input.hidden && card.parentElement !== wrapper) { wrapper.append(card); card.classList.remove('external-definition'); }
+    ready = current; busy = working; published=publishedNames;
+    if (!input.dom.hidden && card.parentElement !== wrapper) { wrapper.append(card); card.classList.remove('external-definition'); }
     if (ready && !wasReady) { generation++; last = ''; }
     wasReady = ready;
-    if (source !== input.value) {
+    if (source !== input.getSource()) {
       ioDetected = false; ioPanel.hidden = true; clear();
-      source = input.value; targets.replaceChildren(); buttons.clear(); fragments.clear(); declarationIndices.clear();
-      const declarations = tokenize(source).filter(token => token.kind === 'definition');
-      for (const site of definitionSites(source)) {
-        declarationIndices.set(site.name, declarations.findIndex(token => token.start === site.start));
-        const button = makeTarget(site.name); buttons.set(site.name, button); fragments.set(site.name, [button]);
-      }
-      if (selected && !buttons.has(selected)) { selected = undefined; card.hidden = true; result.textContent = ''; }
+      source = input.getSource();
+      if(selected&&!input.declarations().some(site=>site.name===selected)){selected=undefined;card.hidden=true;result.textContent='';}
     }
+
     if (selected && publishedNames && !publishedNames.includes(selected)) {
       selected = undefined; pending = undefined; last = ''; card.hidden = true; result.textContent = '';
     }
-    targets.hidden = input.hidden;
-    for (const [name, button] of buttons) {
-      const available = !publishedNames || publishedNames.includes(name);
-      button.disabled = !ready || busy || !available;
-      button.title = available ? `Inspect ${name}` : `${name} is private in this published package. Edit source to compile locally.`;
-    }
     format.disabled = !ready || busy;
     run.disabled = !ready || busy || !ioDetected; stop.disabled = !ioRunning; returnFormat.disabled = step.disabled = busy;
     copy.disabled = download.disabled = busy || !saved;
@@ -252,12 +183,10 @@ export function definitionInspector(input: HTMLTextAreaElement, request: (id: nu
     }
     position(); schedule();
   }
-  input.addEventListener('scroll', position, { passive: true });
-  new ResizeObserver(position).observe(input);
+  input.onLayout(position);
   new ResizeObserver(position).observe(card);
-  new MutationObserver(position).observe(wrapper.querySelector('.syntax-viewport')!, { childList: true, subtree: true });
   return {
-    open(name: string): void { card.classList.toggle('external-definition', input.hidden); if (input.hidden) { card.style.top = ''; document.getElementById('package-definition-view')!.append(card); } else wrapper.append(card); choose(name); },
+    open(name: string): void { card.classList.toggle('external-definition', input.dom.hidden); if (input.dom.hidden) { card.style.top = ''; document.getElementById('package-definition-view')!.append(card); } else wrapper.append(card); choose(name); },
     event(message: WorkerMessage | CompilerMessage): void {
       if (!ioRunning) return;
       if (message.type === 'output') { terminal.textContent += message.text; terminal.scrollTop = terminal.scrollHeight; }
@@ -266,10 +195,9 @@ export function definitionInspector(input: HTMLTextAreaElement, request: (id: nu
       if (message.type === 'done') { ioRunning = false; inputForm.hidden = true; next.disabled = true; status.textContent = 'IO finished · Returned value'; save(message.result); }
       position();
     },
-    // Stop is an explicit suspension, not an invitation to re-observe a divergent
-    // binding automatically as soon as the same source is compiled again.
+    // Stop suspends observation until the user reopens the definition.
     stopped(message: string, suspend = false): void { suspended = suspend; ioRunning = false; inputForm.hidden = true; next.disabled = true; stop.disabled = true; status.textContent = message; },
-    reset(): void { suspended = false; ioRunning = false; ioDetected = false; ioPanel.hidden = true; clear(); selected = undefined; pending = undefined; last = ''; card.hidden = true; result.textContent = ''; for (const button of targets.querySelectorAll('button')) button.setAttribute('aria-expanded', 'false'); },
+    reset(): void { suspended = false; ioRunning = false; ioDetected = false; ioPanel.hidden = true; clear(); selected = undefined; pending = undefined; last = ''; card.hidden = true; result.textContent = ''; position(); },
     update,
     reply(message: InspectionReply): boolean {
       if (message.id !== pending) return false;
diff --git a/ext/demo-site/src/import-folds.ts b/ext/demo-site/src/import-folds.ts
@@ -0,0 +1,83 @@
+// Hash decorations project canonical UTF-16 document ranges. Editing a revealed
+// hash uses ordinary character-level selection and deletion.
+import {EditorState, StateField, StateEffect, Transaction, EditorSelection, EditorView, Decoration, WidgetType, type Range} from './codemirror.js';
+import {tokenize} from './syntax.js';
+export interface ImportSite {from:number;to:number;hash:string;line:number}
+const cachedSites=new WeakMap<EditorState['doc'],ImportSite[]>();
+export function importSites(state:EditorState):ImportSite[] {
+  const cached=cachedSites.get(state.doc);if(cached)return cached;
+  const source=state.doc.toString();
+  const sites=tokenize(source).filter(token=>token.kind==='directive'&&token.text==='!import').flatMap(token=>{
+    const line=state.doc.lineAt(token.start);
+    if(source.slice(line.from,token.start).trim())return [];
+    const match=/^[ \t]+([a-f0-9]{64})(?=[ \t\r\n]|$)/.exec(source.slice(token.end));
+    if(!match)return [];
+    const from=token.end+match[0].length-64;
+    return [{from,to:from+64,hash:match[1]!,line:line.number}];
+  });
+  cachedSites.set(state.doc,sites);return sites;
+}
+export const importFocus=StateEffect.define<boolean>();
+const toggle=StateEffect.define<number>();
+const short=(hash:string)=>hash.slice(0,3)+'...'+hash.slice(-3);
+class ImportHash extends WidgetType {
+  constructor(readonly site:ImportSite,readonly expanded:boolean){super();}
+  eq(other:ImportHash):boolean{return this.site.from===other.site.from&&this.site.hash===other.site.hash&&this.expanded===other.expanded;}
+  toDOM(view:EditorView):HTMLElement {
+    const button=document.createElement('button');button.type='button';button.className='import-hash';
+    button.textContent=this.expanded?this.site.hash:short(this.site.hash);button.dataset.hashFrom=String(this.site.from);
+    button.setAttribute('aria-expanded',String(this.expanded));
+    button.setAttribute('aria-label',`${this.expanded?'Collapse':'Expand'} import hash ${this.site.hash}`);
+    button.onclick=()=>{
+      view.dispatch({effects:toggle.of(this.site.from),annotations:Transaction.addToHistory.of(false)});
+      view.dom.querySelector<HTMLElement>(`[data-hash-from="${this.site.from}"]`)?.focus({preventScroll:true});
+    };
+    // Ctrl+A on a hash control selects the complete canonical program.
+    button.onkeydown=event=>{
+      if((event.ctrlKey||event.metaKey)&&event.key.toLowerCase()==='a'){
+        event.preventDefault();view.dispatch({selection:EditorSelection.single(0,view.state.doc.length),effects:importFocus.of(true)});view.focus();
+      }
+    };
+    return button;
+  }
+  ignoreEvent():boolean{return true;}
+}
+interface Folds {open:Set<number>;active:boolean;sites:ImportSite[];decorations:ReturnType<typeof Decoration.set>}
+export function selectedImportLines(state:EditorState,active:boolean):Set<number> {
+  const lines=new Set<number>();
+  for(const range of state.selection.ranges){
+    if(!active&&range.empty)continue;
+    const from=state.doc.lineAt(range.from).number,to=state.doc.lineAt(range.empty?range.to:Math.max(range.from,range.to-1)).number;
+    for(let line=from;line<=to;line++)lines.add(line);
+  }
+  return lines;
+}
+function decorate(state:EditorState,open:Set<number>,active:boolean):Folds {
+  const sites=importSites(state),selected=selectedImportLines(state,active),ranges:Range<Decoration>[]=[];
+  for(const site of sites)ranges.push((selected.has(site.line)?Decoration.mark({class:'import-hash-full'}):
+    Decoration.replace({widget:new ImportHash(site,open.has(site.from))})).range(site.from,site.to));
+  return {open,active,sites,decorations:Decoration.set(ranges,true)};
+}
+export const importFolds=StateField.define<Folds>({
+  create:state=>decorate(state,new Set(),false),
+  update:(old,tr)=>{
+    let active=old.active;
+    const open=tr.docChanged?new Set(old.sites.filter(site=>old.open.has(site.from)&&!tr.changes.touchesRange(site.from,site.to))
+      .map(site=>tr.changes.mapPos(site.from,1))):new Set(old.open);
+    if(tr.selection&&tr.isUserEvent('select'))active=true;
+    for(const effect of tr.effects){
+      if(effect.is(toggle)){if(open.has(effect.value))open.delete(effect.value);else open.add(effect.value);}
+      if(effect.is(importFocus))active=effect.value;
+    }
+    if(!tr.docChanged&&!tr.selection&&active===old.active&&open.size===old.open.size&&[...open].every(pos=>old.open.has(pos)))return old;
+    return decorate(tr.state,open,active);
+  },
+  provide:field=>EditorView.decorations.from(field,value=>value.decorations)
+});
+export function syncImportFocus(view:EditorView):void {
+  queueMicrotask(()=>{
+    const old=view.state.field(importFolds).active,element=view.dom.ownerDocument.activeElement;
+    const active=element===view.contentDOM?true:view.dom.contains(element)?old:false;
+    if(old!==active)view.dispatch({effects:importFocus.of(active),annotations:Transaction.addToHistory.of(false)});
+  });
+}
diff --git a/ext/demo-site/src/import-picker.ts b/ext/demo-site/src/import-picker.ts
@@ -1,3 +1,4 @@
+import type { SourceEditor } from './source-editor.js';
 import { fetchBytes } from './bundle.js';
 import { libraryIndex, latestLibraries, matchesLibrary, type Library } from './library-index.js';
 import { packageReleases } from './packages.js';
@@ -5,7 +6,7 @@ import type { ImportPlan } from './import-plan.js';
 import type { LocalModuleInput } from './local-modules.js';
 interface Choice { title: string; description: string; manifest: string; names: string[]; alias: string; library?: Library; definition?: string; }
 interface Options {
-  source: HTMLTextAreaElement;
+  source: SourceEditor;
   backend(): string;
   available(): boolean;
   editable(): boolean;
@@ -116,7 +117,7 @@ export function importPicker(options: Options): { cancel(): void } {
   }
   open.onclick = () => {
     if (!options.available()) return;
-    snapshot = options.source.value; backend = options.backend(); search.value = ''; dialog.showModal(); browse(); search.focus();
+    snapshot = options.source.getSource(); backend = options.backend(); search.value = ''; dialog.showModal(); browse(); search.focus();
     if (!libraries) {
       message('Loading library references…');
       void fetchBytes(new URL('../reference/libraries.json', import.meta.url), 2_097_152).then(bytes => {
@@ -143,17 +144,12 @@ export function importPicker(options: Options): { cancel(): void } {
   };
   get('copy-import').onclick = () => { void navigator.clipboard.writeText(statement()).then(() => message('Import copied.'), () => message('Select and copy the import preview.')); };
   function applyPlan(): void {
-    if (!plan || !options.available() || options.source.value !== snapshot || options.backend() !== backend) { stop(); insert.disabled = true; message('The editor changed. Close and reopen the picker to use the current source.'); return; }
+    if (!plan || !options.available() || options.source.getSource() !== snapshot || options.backend() !== backend) { stop(); insert.disabled = true; message('The editor changed. Close and reopen the picker to use the current source.'); return; }
     const checked = plan;
     finish(); options.source.focus();
-    if (checked.existing) { options.source.setSelectionRange(checked.existing.start, checked.existing.end); return; }
-    // Native textarea editing supplies one undo transaction on supported browsers.
-    options.source.setSelectionRange(0, 0);
-    if (!document.execCommand('insertText', false, checked.statement)) {
-      message('Your browser could not insert an undoable edit. Copy the import from the picker.');
-      dialog.showModal(); return;
-    }
-    options.source.setSelectionRange(0, checked.statement.length);
+    if (checked.existing) { options.source.select(checked.existing.start, checked.existing.end); return; }
+    options.source.edit(0,0,checked.statement);
+    options.source.select(0,checked.statement.length);
 
   }
   insert.onclick = () => applyPlan();
diff --git a/ext/demo-site/src/source-editor.ts b/ext/demo-site/src/source-editor.ts
@@ -0,0 +1,142 @@
+import { importFolds, importFocus, importSites, syncImportFocus } from './import-folds.js';
+import {EditorState, StateField, StateEffect, Transaction, EditorSelection, Compartment, type Range, type Extension,
+  EditorView, Decoration, keymap, drawSelection, history, historyKeymap, standardKeymap, isolateHistory, undo, redo, insertNewline} from './codemirror.js';
+import {tokenize, bracketPair, definitionSites} from './syntax.js';
+
+// Enter inserts a plain newline, preserving explicit source indentation.
+const plainNewline=(view:EditorView):boolean=>!view.state.readOnly&&insertNewline(view);
+
+interface Definitions { ready: boolean; busy: boolean; selected?: string; published?: string[] }
+const definitions = StateEffect.define<Definitions>();
+const definitionState = StateField.define<Definitions>({
+  create: () => ({ready:false,busy:false}),
+  update: (old,tr) => {for(const effect of tr.effects)if(effect.is(definitions))return effect.value;return old;}
+});
+const presentations=new WeakMap<EditorState['doc'],{tokens:ReturnType<typeof tokenize>;sites:ReturnType<typeof definitionSites>}>();
+function presentation(state:EditorState) {
+  let cached=presentations.get(state.doc);
+  if(!cached){const source=state.doc.toString(),tokens=tokenize(source);cached={tokens,sites:definitionSites(source,tokens)};presentations.set(state.doc,cached);}
+  return cached;
+}
+function decorations(state: EditorState): ReturnType<typeof Decoration.set> {
+  const {tokens,sites}=presentation(state), selection=state.selection.main;
+  const pair=selection.empty?bracketPair(tokens,selection.head):[];
+  const marks:Range<Decoration>[]=[], imports=importSites(state);
+  for(const token of tokens) if(token.kind&&!imports.some(site=>token.start>=site.from&&token.end<=site.to)) {
+    const match=pair.includes(token.start)?pair.length===2?' bracket-match':' bracket-unmatched':'';
+    marks.push(Decoration.mark({class:`syntax-${token.kind}${match}`}).range(token.start,token.end));
+  }
+  const controls=state.field(definitionState);
+  if(controls.ready) for(const site of sites) {
+    if(controls.published&&!controls.published.includes(site.name)||controls.busy&&controls.selected!==site.name)continue;
+    marks.push(Decoration.mark({class:'definition-name',attributes:{
+      role:'button',tabindex:controls.busy?'-1':'0','data-definition':site.name,
+      'aria-label':`Inspect compiled definition ${site.name}`,'aria-controls':'inline-definition',
+      'aria-expanded':String(controls.selected===site.name),'aria-disabled':String(controls.busy)
+    }}).range(site.start,site.start+site.name.length));
+  }
+  return Decoration.set(marks,true);
+}
+const syntax=StateField.define({
+  create:decorations,
+  update:(old,tr)=>tr.docChanged||tr.selection||tr.effects.some(effect=>effect.is(definitions))?decorations(tr.state):old,
+  provide:field=>EditorView.decorations.from(field)
+});
+// Symbol.for shares the mounted component across independently bundled test
+// and application entrypoints.
+const editorKey=Symbol.for('tricu.source-editor');
+type MountedEditor=HTMLElement&{[editorKey]?:SourceEditor};
+// Controller and browser fixtures access the same EditorState document,
+// selection and history through the mounted component.
+export function editorFor(element:HTMLElement):SourceEditor {
+  const editor=(element as MountedEditor)[editorKey];if(!editor)throw Error('Source editor is not initialized');return editor;
+}
+export class SourceEditor {
+  readonly view:EditorView;
+  private readonly configuration:Extension[];
+  private currentDefinitions:Definitions={ready:false,busy:false};
+  private readonly availability=new Compartment();
+  private readonly changes=new Set<()=>void>();
+  private readonly layouts=new Set<()=>void>();
+  private locked=false;
+  private readonlySource=false;
+  private controls='';
+  private pendingEpoch:number|undefined;
+  private epoch=0;
+  constructor(readonly dom:HTMLElement) {
+    dom.classList.add('source-editor');
+    this.configuration=[
+      definitionState,syntax,importFolds,history(),drawSelection(),EditorState.tabSize.of(2),
+      keymap.of([{key:'Enter',run:plainNewline,shift:plainNewline},...historyKeymap,...standardKeymap]),EditorView.lineWrapping,
+      this.availability.of([EditorState.readOnly.of(false),EditorView.editable.of(true)]),
+      EditorView.domEventHandlers({focus:(_event,view)=>syncImportFocus(view),blur:(_event,view)=>syncImportFocus(view)}),
+      EditorView.contentAttributes.of({'aria-label':'tricu source (up to 16,384 characters)',spellcheck:'false',autocorrect:'off',autocapitalize:'off'}),
+      EditorView.updateListener.of(update=>{
+        if(update.docChanged)this.notify();
+        // Schedule external listeners after EditorView.update so controller
+        // effects can dispatch their own transactions.
+        queueMicrotask(()=>{for(const listener of this.layouts)listener();});
+      }),
+      EditorView.theme({'&':{height:'100%'},'.cm-scroller':{overflow:'auto',fontFamily:'inherit',lineHeight:'inherit'},
+        '.cm-content':{padding:'18px 20px',fontFamily:'inherit',fontVariantLigatures:'none',minHeight:'100%'},
+        '.cm-line':{padding:'0'},'.cm-cursor':{borderLeftColor:'var(--syntax-ink)'},
+        '.cm-selectionBackground, &.cm-focused .cm-selectionBackground':{background:'#799ea066'}})
+    ];
+    this.view=new EditorView({parent:dom,state:EditorState.create({extensions:this.configuration})});
+    this.view.scrollDOM.addEventListener('scroll',()=>{for(const listener of this.layouts)listener();},{passive:true});
+    new ResizeObserver(()=>{for(const listener of this.layouts)listener();}).observe(dom);
+    dom.addEventListener('compositionstart',()=>dom.classList.add('composing'));
+    dom.addEventListener('compositionend',()=>dom.classList.remove('composing'));
+    (dom as MountedEditor)[editorKey]=this;
+  }
+  private notify():void {
+    const epoch=this.epoch;if(this.pendingEpoch===epoch)return;this.pendingEpoch=epoch;
+    queueMicrotask(()=>{if(this.pendingEpoch===epoch)this.flushChange();});
+  }
+  // Controller edits notify after the view update returns; native-input edits
+  // notify at the microtask boundary. Both refresh revisions before the next
+  // user event. Document epochs discard notifications from previous loads.
+  private flushChange():void {
+    if(this.pendingEpoch!==this.epoch)return;this.pendingEpoch=undefined;
+    for(const listener of this.changes)listener();
+  }
+  undo():boolean{const result=undo(this.view);this.flushChange();return result;}
+  redo():boolean{const result=redo(this.view);this.flushChange();return result;}
+  getSource():string{return this.view.state.doc.toString();}
+  getSelection():{from:number;to:number}{const {from,to}=this.view.state.selection.main;return {from,to};}
+  focus():void{this.view.focus();}
+  declarations():ReturnType<typeof definitionSites>{return presentation(this.view.state).sites;}
+  revealDefinition(name:string):boolean {
+    const site=this.declarations().find(site=>site.name===name);if(!site)return false;
+    this.view.dispatch({effects:EditorView.scrollIntoView(site.start,{y:'center'})});return true;
+  }
+  select(from:number,to=from):void{this.view.dispatch({selection:EditorSelection.single(from,to),effects:importFocus.of(true),scrollIntoView:true});this.focus();}
+  // Loading/restoring documents retires old history; import insertion is a
+  // separate, isolated undoable edit. Notification is explicit for controller edits.
+  replaceSource(source:string,notify=false):void {
+    this.epoch++;this.pendingEpoch=undefined;
+    const state=EditorState.create({doc:source,extensions:this.configuration});
+    this.view.setState(state.update({effects:[definitions.of(this.currentDefinitions),
+      this.availability.reconfigure([EditorState.readOnly.of(this.locked||this.readonlySource),EditorView.editable.of(!this.locked&&!this.readonlySource)])]}).state);
+    if(notify){this.pendingEpoch=this.epoch;this.flushChange();}
+  }
+  edit(from:number,to:number,text:string):void {
+    this.view.dispatch({changes:{from,to,insert:text},selection:EditorSelection.single(from+text.length),
+      annotations:[Transaction.userEvent.of('input'),isolateHistory.of('full')]});
+    this.focus();this.flushChange();
+  }
+  get isDisabled():boolean{return this.locked;}
+  get isReadOnly():boolean{return this.readonlySource;}
+  setAvailability(disabled:boolean,readOnly:boolean):void {
+    if(this.locked===disabled&&this.readonlySource===readOnly)return;
+    this.locked=disabled;this.readonlySource=readOnly;this.dom.classList.toggle('disabled',disabled);
+    this.view.dispatch({effects:this.availability.reconfigure([EditorState.readOnly.of(disabled||readOnly),EditorView.editable.of(!disabled&&!readOnly)])});
+  }
+  setDefinitions(value:Definitions):void {
+    const key=JSON.stringify(value);if(key===this.controls)return;this.controls=key;this.currentDefinitions=value;
+    this.view.dispatch({effects:definitions.of(value)});
+  }
+  onChange(listener:()=>void):()=>void{this.changes.add(listener);return ()=>this.changes.delete(listener);}
+  onLayout(listener:()=>void):void{this.layouts.add(listener);}
+  refresh():void{this.view.requestMeasure();}
+}
diff --git a/ext/demo-site/src/syntax.ts b/ext/demo-site/src/syntax.ts
@@ -1,5 +1,5 @@
-// Presentation only: never used for parsing, compilation, or name resolution.
-// Offsets are UTF-16 textarea offsets, not compiler Unicode-scalar positions.
+// Lexical highlighting and declaration-site decoration. Editor offsets count
+// UTF-16 code units; compiler positions count Unicode scalars.
 export interface Token { start: number; end: number; kind: string; text: string }
 const keywords = new Set(['let', 'in', 'where', 'do', 'case', 'of', 'rec']);
 export function tokenize(source: string): Token[] {
@@ -99,40 +99,11 @@ export function paintSyntax(target: HTMLElement, tokens: Token[], pair: number[]
   target.replaceChildren(fragment);
 }
 
-export function syntaxEditor(input: HTMLTextAreaElement): () => void {
-  const wrapper = document.createElement('div'); wrapper.className = 'syntax-editor';
-  input.before(wrapper); wrapper.append(input);
-  const viewport = document.createElement('div'); viewport.className = 'syntax-viewport'; viewport.setAttribute('aria-hidden', 'true');
-  const mirror = document.createElement('pre'); viewport.append(mirror); wrapper.prepend(viewport);
-  let value: string | undefined, tokens: Token[] = [], lastPair = '', composing = false;
-  function scroll(): void { mirror.style.transform = `translate(${-input.scrollLeft}px, ${-input.scrollTop}px)`; }
-  function refresh(): void {
-    wrapper.hidden = input.hidden;
-    wrapper.classList.toggle('modified', input.classList.contains('modified'));
-    wrapper.classList.toggle('disabled', input.disabled);
-    wrapper.classList.toggle('composing', composing);
-    const style = getComputedStyle(input);
-    // Use the textarea's actual content box, excluding scrollbar and border.
-    mirror.style.width = `${input.clientWidth}px`;
-    viewport.style.inset = `${style.borderTopWidth} ${style.borderRightWidth} ${style.borderBottomWidth} ${style.borderLeftWidth}`;
-    for (const property of ['font-family', 'font-size', 'line-height', 'font-weight', 'font-style', 'font-stretch', 'font-variant-ligatures', 'font-kerning', 'font-feature-settings', 'font-variation-settings', 'letter-spacing', 'padding', 'tab-size', 'text-align']) mirror.style.setProperty(property, style.getPropertyValue(property));
-    const changed = value !== input.value;
-    if (changed) { value = input.value; tokens = tokenize(value); }
-    const pair = !composing && document.activeElement === input && input.selectionStart === input.selectionEnd ? bracketPair(tokens, input.selectionStart) : [];
-    if (changed || pair.join() !== lastPair) {
-      paintSyntax(mirror, tokens, pair); lastPair = pair.join();
-      // Preserve a trailing empty line without introducing a new line.
-      if (!value || value.endsWith('\n')) mirror.append(document.createTextNode(' '));
-    }
-    scroll();
-  }
-  input.classList.add('syntax-input');
-  for (const event of ['input', 'click', 'keyup', 'select', 'focus', 'blur']) input.addEventListener(event, refresh);
-  input.addEventListener('compositionstart', () => { composing = true; refresh(); });
-  input.addEventListener('compositionend', () => { composing = false; refresh(); });
-  input.addEventListener('scroll', scroll, { passive: true });
-  document.addEventListener('selectionchange', () => { if (document.activeElement === input) refresh(); });
-  new ResizeObserver(refresh).observe(input);
-  new MutationObserver(refresh).observe(input, { attributes: true, attributeFilter: ['hidden', 'disabled', 'class'] });
-  refresh(); return refresh;
+// Unique top-level declaration heads recognized by lexical layout.
+export function definitionSites(source: string, tokens = tokenize(source)): { name: string; start: number }[] {
+  const seen = new Set<string>();
+  return tokens.filter(token => {
+    if (token.kind !== 'definition' || token.start > 0 && source[token.start - 1] !== '\n' || seen.has(token.text)) return false;
+    seen.add(token.text); return true;
+  }).map(token => ({ name: token.text, start: token.start }));
 }
diff --git a/ext/demo-site/style.css b/ext/demo-site/style.css
@@ -13,17 +13,9 @@
 @media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
 
 
-.syntax-editor{position:relative;min-width:0;background:var(--panel);--syntax-ink:var(--ink);--syn-comment:#56695e;--syn-string:#27613d;--syn-escape:#95511e;--syn-number:#27578c;--syn-keyword:#6c367c;--syn-definition:#754300;--syn-tree:#006b60;--syn-contract:#934824;--syn-invalid:#ae3026;--syn-match:#d4e5c4}
 .source-panel{--syntax-ink:#e3edde;--syn-comment:#9cafa4;--syn-string:#c0d9a3;--syn-escape:#f4bc8d;--syn-number:#9ecff5;--syn-keyword:#d6b5ef;--syn-definition:#ffd08a;--syn-tree:#73dbc0;--syn-contract:#f4bc8d;--syn-invalid:#ffb2a6;--syn-match:#435b43}
-.source-panel .syntax-editor{background:var(--code);--syntax-ink:inherit;--syn-comment:inherit;--syn-string:inherit;--syn-escape:inherit;--syn-number:inherit;--syn-keyword:inherit;--syn-definition:inherit;--syn-tree:inherit;--syn-contract:inherit;--syn-invalid:inherit;--syn-match:inherit}
-.source-panel .syntax-editor.modified{background:#273c32}.syntax-editor.disabled .syntax-viewport{opacity:.75}
-.syntax-viewport{position:absolute;pointer-events:none;overflow:hidden;user-select:none}
-.syntax-viewport pre{margin:0;border:0;border-radius:0;white-space:pre-wrap;overflow-wrap:break-word;word-break:normal;min-height:100%;color:var(--syntax-ink);transform-origin:top left}
-#source-editor.syntax-input{position:relative;color:transparent;-webkit-text-fill-color:transparent;caret-color:var(--syntax-ink);background:transparent;white-space:pre-wrap;overflow-wrap:break-word;word-break:normal;display:block}
-.syntax-input::selection{background:#799ea066;color:transparent}.syntax-comment{color:var(--syn-comment)}.syntax-string{color:var(--syn-string)}.syntax-escape{color:var(--syn-escape)}.syntax-number{color:var(--syn-number)}.syntax-keyword,.syntax-directive{color:var(--syn-keyword)}.syntax-tree{color:var(--syn-tree)}.syntax-definition{color:var(--syn-definition)}.syntax-contract{color:var(--syn-contract)}.syntax-invalid{color:var(--syn-invalid);text-decoration:underline wavy}.bracket-match{background:var(--syn-match);box-shadow:inset 0 -2px var(--syn-definition)}.bracket-unmatched{text-decoration:underline wavy var(--syn-invalid);text-underline-offset:3px}
-.syntax-editor.composing .syntax-viewport{visibility:hidden}.syntax-editor.composing .syntax-input{color:var(--syntax-ink)!important;-webkit-text-fill-color:var(--syntax-ink)!important}
-@media(forced-colors:active){.syntax-viewport{display:none}#source-editor.syntax-input{color:CanvasText;-webkit-text-fill-color:CanvasText;caret-color:CanvasText}.syntax-input::selection{background:Highlight;color:HighlightText;-webkit-text-fill-color:HighlightText}}
-.syntax-editor{--syn-operator:#516263}.source-panel{--syn-operator:#aac6cc}.source-panel .syntax-editor{--syn-operator:inherit}.syntax-operator,.syntax-bracket{color:var(--syn-operator)}.syntax-input,.syntax-viewport pre{font-variant-ligatures:none}
+.syntax-comment{color:var(--syn-comment)}.syntax-string{color:var(--syn-string)}.syntax-escape{color:var(--syn-escape)}.syntax-number{color:var(--syn-number)}.syntax-keyword,.syntax-directive{color:var(--syn-keyword)}.syntax-tree{color:var(--syn-tree)}.syntax-definition{color:var(--syn-definition)}.syntax-contract{color:var(--syn-contract)}.syntax-invalid{color:var(--syn-invalid);text-decoration:underline wavy}.bracket-match{background:var(--syn-match);box-shadow:inset 0 -2px var(--syn-definition)}.bracket-unmatched{text-decoration:underline wavy var(--syn-invalid);text-underline-offset:3px}
+.source-panel{--syn-operator:#aac6cc}.syntax-operator,.syntax-bracket{color:var(--syn-operator)}
 @media(max-width:740px){.editor-toolbar #status{flex:1 1 100px;order:3;align-self:center}}
 
 #local-modules code, #local-modules p { overflow-wrap: anywhere; }
@@ -51,13 +43,13 @@ header nav{align-items:center;gap:12px}#theme-separator{color:var(--muted)}
 #theme-toggle:hover{background:var(--panel)}
 
 
-.definition-targets{position:absolute;inset:0;overflow:hidden;pointer-events:none;z-index:2}
-.definition-targets button{position:absolute;min-height:0;min-width:0;margin:0;padding:0;border:0;border-bottom:1px dotted var(--syn-definition);border-radius:0;background:transparent;color:transparent;-webkit-text-fill-color:transparent;white-space:nowrap;overflow:hidden;pointer-events:auto;user-select:text;-webkit-user-select:text;touch-action:manipulation;forced-color-adjust:none}
-.definition-targets button:hover:not(:disabled),.definition-targets button[aria-expanded="true"]{background:#8bd3ad24;border-bottom:1px solid var(--syn-definition)}
-.definition-targets button:disabled{pointer-events:none;opacity:1}
-.definition-targets button:focus-visible{outline:2px solid #bfe2ba;outline-offset:2px}
-.definition-targets button::selection{background:#799ea066;color:#e3edde;-webkit-text-fill-color:#e3edde}
-.syntax-editor.composing .definition-targets{display:none}
+#source-editor.source-editor{padding:0;position:relative;color:var(--syntax-ink)}
+.source-editor .cm-editor{font:inherit;background:transparent}.source-editor.disabled{opacity:.75}
+.definition-name{text-decoration:underline dotted var(--syn-definition);text-underline-offset:3px;cursor:pointer;touch-action:manipulation}
+.definition-name:hover,.definition-name[aria-expanded="true"]{background:#8bd3ad24;text-decoration-style:solid}
+.definition-name[aria-disabled="true"]{cursor:default;pointer-events:none}.definition-name:focus-visible{outline:2px solid #bfe2ba;outline-offset:2px}
+.source-editor.composing .definition-name{text-decoration:none;pointer-events:none}
+@media(max-width:740px){.source-editor .cm-content{padding:16px}}
 .definition-card{position:absolute;left:8px;right:8px;z-index:3;max-height:260px;overflow:auto;margin:0;padding:12px;border:1px solid #587362;border-radius:8px;background:#21352b;color:#e3edde;min-width:0}
 .definition-card-controls{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-top:10px;padding-top:8px;border-top:1px solid #385045}
 .definition-card-controls strong{flex:1;min-width:0;overflow-wrap:anywhere;font-size:12px;font-weight:500;color:#b1c1b7}
@@ -70,7 +62,7 @@ header nav{align-items:center;gap:12px}#theme-separator{color:var(--muted)}
 #import-exports{display:flex;gap:6px;flex-wrap:wrap}#import-exports button{font:inherit;font-size:13px;padding:5px 8px}
 #import-results h3{margin-bottom:0}#try-library,#copy-qualified{margin:8px 8px 8px 0}
 
-@media(forced-colors:active){.has-definition-inspector .syntax-viewport{display:block;visibility:hidden}.definition-targets{--syn-definition:ButtonText}.definition-targets button{border-color:ButtonText}.definition-targets button:hover:not(:disabled),.definition-targets button[aria-expanded="true"]{background:transparent}.definition-targets button::selection{background:Highlight;color:HighlightText;-webkit-text-fill-color:HighlightText}.definition-targets button:focus-visible{outline-color:Highlight}.definition-card{background:Canvas;color:CanvasText;border-color:CanvasText}.definition-card .hint,.definition-card button,.definition-card select{color:CanvasText;background:Canvas}}
+@media(forced-colors:active){.definition-name{color:LinkText}.definition-name:focus-visible{outline-color:Highlight}.definition-card{background:Canvas;color:CanvasText;border-color:CanvasText}.definition-card .hint,.definition-card button,.definition-card select{color:CanvasText;background:Canvas}}
 
 /* Definition cards own both inspection and explicitly authorized IO. */
 .definition-card .definition-actions,.inline-io-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:8px}
@@ -89,3 +81,7 @@ header nav{align-items:center;gap:12px}#theme-separator{color:var(--muted)}
 .definition-card{color-scheme:dark;--green:#8bd3ad}
 
 .definition-card .edit-definition-name{display:inline-block;width:auto;height:auto;padding:4px 10px;margin-top:8px;font-size:12px;border:1px solid #587362}
+
+.source-editor .import-hash{display:inline;min-width:0;min-height:0;max-width:100%;margin:0;padding:0;border:0;border-radius:0;font:inherit;line-height:inherit;vertical-align:baseline;color:#8accc8;background:transparent;white-space:pre-wrap;overflow-wrap:anywhere;text-decoration:underline dotted;text-underline-offset:3px;cursor:pointer}
+.source-editor .import-hash:hover{background:#8bd3ad24}.source-editor .import-hash:focus-visible{outline:2px solid #bfe2ba;outline-offset:2px}.source-editor .import-hash-full{color:#8accc8}
+@media(forced-colors:active){.source-editor .import-hash{color:LinkText}.source-editor .import-hash-full{color:CanvasText}}
diff --git a/ext/demo-site/test/asset-cache-probe.mjs b/ext/demo-site/test/asset-cache-probe.mjs
@@ -4,7 +4,7 @@ const el=id=>document.getElementById(id),delay=ms=>new Promise(r=>setTimeout(r,m
 const assert=(ok,message)=>{if(!ok)throw Error(message);};
 async function status(wanted){for(let i=0;i<4500;i++){if(el('status').textContent===wanted)return;await delay(20);}throw Error('Waiting for '+wanted+': '+el('status').textContent+' '+el('compile-diagnostic').textContent);}
 const change=(id,value)=>{el(id).value=value;el(id).dispatchEvent(new Event('change'));};
-const input=(id,value)=>{el(id).value=value;el(id).dispatchEvent(new Event('input'));};
+const input=(id,value)=>{if(id==='source-editor'){globalThis.__sourceEditor.replaceSource(value,true);return;}el(id).value=value;el(id).dispatchEvent(new Event('input'));};
 export async function run(control,backend='haskell-wasm'){
  await status('Ready');
  if(el('runtime-backend').value!==backend){change('runtime-backend',backend);await status('Ready');}
diff --git a/ext/demo-site/test/backend-browser.mjs b/ext/demo-site/test/backend-browser.mjs
@@ -61,7 +61,8 @@ try {
     console.log('Test phases:',JSON.stringify(marks.slice(-4)));
     void evaluate("({status:document.getElementById('status')?.textContent,activity:document.getElementById('compile-activity')?.textContent,card:document.querySelector('.definition-card [role=status]')?.textContent})").then(state=>console.log('Page:',JSON.stringify(state))).catch(()=>{});
   },30000);
-  const report=await evaluate(`import(${JSON.stringify(process.env.TEST_DEFINITION_NAMES?'/definition-names-probe.mjs':process.env.TEST_INLINE_IO?'/inline-io-probe.mjs':process.env.TEST_BASIC_EXAMPLES?'/basic-examples-probe.mjs':process.env.TEST_IMPORT_PICKER?'/import-picker-probe.mjs':process.env.TEST_COLD_LOAD?'/cold-load-probe.mjs':process.env.TEST_ASSET_CACHE?'/asset-cache-probe.mjs':process.env.TEST_LOCAL_MODULES?'/local-module-probe.mjs':process.env.TEST_MODULES?'/module-probe.mjs':process.env.TEST_IDE?'/ide-probe.mjs':process.env.TEST_LIVE_UX?'/live-ux-probe.mjs':process.env.TEST_BENCHMARK?'/backend-benchmark.mjs':'/backend-probe.mjs')}).then(m=>m.run(${JSON.stringify(control)},${JSON.stringify(process.env.TEST_BACKEND||'haskell-wasm')},${!!process.env.BENCHMARK_PSS}))`);
+  const report=await evaluate(`import(${JSON.stringify(process.env.TEST_IMPORT_FOLDS?'/import-folds-probe.mjs':process.env.TEST_DEFINITION_NAMES?'/definition-names-probe.mjs':process.env.TEST_INLINE_IO?'/inline-io-probe.mjs':process.env.TEST_BASIC_EXAMPLES?'/basic-examples-probe.mjs':process.env.TEST_IMPORT_PICKER?'/import-picker-probe.mjs':process.env.TEST_COLD_LOAD?'/cold-load-probe.mjs':process.env.TEST_ASSET_CACHE?'/asset-cache-probe.mjs':process.env.TEST_LOCAL_MODULES?'/local-module-probe.mjs':process.env.TEST_MODULES?'/module-probe.mjs':process.env.TEST_IDE?'/ide-probe.mjs':process.env.TEST_LIVE_UX?'/live-ux-probe.mjs':process.env.TEST_BENCHMARK?'/backend-benchmark.mjs':'/backend-probe.mjs')}).then(m=>m.run(${JSON.stringify(control)},${JSON.stringify(process.env.TEST_BACKEND||'haskell-wasm')},${!!process.env.BENCHMARK_PSS}))`);
+  if(process.env.TEST_IMPORT_FOLDS)await (await import('./import-fold-inputs.mjs')).importFoldInputs({send,evaluate,report,prefix:process.env.TEST_SCREENSHOT_PREFIX});
   if(process.env.TEST_DEFINITION_NAMES)await (await import('./definition-name-inputs.mjs')).definitionNameInputs({send,evaluate,report,prefix:process.env.TEST_SCREENSHOT_PREFIX});
   if(process.env.TEST_INLINE_IO&&process.env.TEST_SCREENSHOT_PREFIX){
     await evaluate("document.getElementById('run-io').click()");
@@ -94,24 +95,24 @@ try {
     }
     await evaluate(`(()=>{
       document.querySelector('[data-compiler-example=identity]').click();
-      const source=document.getElementById('source-editor');
-      source.value='answer = 42\\nloop = (x : x x) (x : x x)';source.dispatchEvent(new Event('input'));
+      globalThis.__sourceEditor.replaceSource('answer = 42\\nloop = (x : x x) (x : x x)',true);
     })()`);
     await waitFor("document.getElementById('status').textContent==='Compiled'",'scratch compile');
     assert.equal(await evaluate("document.getElementById('reload-playground').disabled"),false,'Recovery available for local drafts');
-    const draftBefore=await evaluate("document.getElementById('source-editor').value");
+    const draftBefore=await evaluate("globalThis.__sourceEditor.getSource()");
     const localsBefore=await evaluate("document.getElementById('local-module-list').children.length");
     await evaluate("window.__reloadProof=true;window.__recoveryPrompts=0;window.confirm=()=>{window.__recoveryPrompts++;return false;};document.getElementById('reload-playground').click()");
     await new Promise(r=>setTimeout(r,100));
     assert.equal(await evaluate('window.__recoveryPrompts'),1,'Draft recovery asks before clearing work');
-    assert.equal(await evaluate("document.getElementById('source-editor').value"),draftBefore,'Cancelled recovery preserves authored source');
+    assert.equal(await evaluate("globalThis.__sourceEditor.getSource()"),draftBefore,'Cancelled recovery preserves authored source');
     assert.equal(await evaluate("document.getElementById('local-module-list').children.length"),localsBefore,'Cancelled recovery preserves local files');
     await evaluate("document.querySelector('[aria-label=\"Inspect compiled definition loop\"]').click()");
     await waitFor("document.getElementById('status').textContent==='Inspecting loop'",'divergent WASM observation');
     assert.equal(await evaluate("document.getElementById('reload-playground').disabled"),false,'Recovery remains available while WASM is stuck');
     await evaluate("window.confirm=()=>true;document.getElementById('reload-playground').click()");
     await waitFor("!window.__reloadProof&&document.getElementById('status')?.textContent==='Ready'",'new page/runtime');
-    assert.equal(await evaluate("document.getElementById('source-editor').readOnly||document.getElementById('source-editor').hidden"),false,'Reload restores editable demo source');
+    await evaluate("import('/source-probe-helpers.mjs').then(()=>true)");
+    assert.equal(await evaluate("globalThis.__sourceEditor.isReadOnly||document.getElementById('source-editor').hidden"),false,'Reload restores editable demo source');
     assert.equal(await evaluate("document.getElementById('local-module-list').children.length"),0,'Reload clears in-memory local modules');
     assert.equal(await evaluate("document.querySelector('.definition-card').hidden"),true,'Reload never automatically inspects');
     assert.equal(await evaluate('document.documentElement.scrollWidth<=innerWidth'),true,'Recovery toolbar fits viewport');
@@ -133,14 +134,14 @@ try {
   }
   if(process.env.TEST_IDE){
     await send('Emulation.setEmulatedMedia',{features:[{name:'forced-colors',value:'active'}]});
-    assert.equal(await evaluate("getComputedStyle(document.querySelector('.syntax-viewport')).visibility==='hidden'&&getComputedStyle(document.getElementById('source-editor')).webkitTextFillColor!=='rgba(0, 0, 0, 0)'"),true,'High contrast retains readable native text');
+    assert.equal(await evaluate("getComputedStyle(globalThis.__sourceEditor.view.contentDOM).color!=='rgba(0, 0, 0, 0)'&&!document.querySelector('.syntax-viewport')"),true,'High contrast retains readable native text');
     await send('Emulation.setEmulatedMedia',{features:[]});
-    const beforeEdit=await evaluate("(()=>{const e=document.getElementById('source-editor');e.focus();e.setSelectionRange(e.value.length,e.value.length);return e.value;})()");
+    const beforeEdit=await evaluate("(()=>{const e=globalThis.__sourceEditor;e.select(e.getSource().length);return e.getSource();})()");
     await send('Input.insertText',{text:' -- native undo'});
-    assert.equal(await evaluate("document.getElementById('source-editor').value"),beforeEdit+' -- native undo');
+    assert.equal(await evaluate("globalThis.__sourceEditor.getSource()"),beforeEdit+' -- native undo');
     await send('Input.dispatchKeyEvent',{type:'keyDown',key:'z',code:'KeyZ',modifiers:2,windowsVirtualKeyCode:90,nativeVirtualKeyCode:90});
     await send('Input.dispatchKeyEvent',{type:'keyUp',key:'z',code:'KeyZ',modifiers:2,windowsVirtualKeyCode:90,nativeVirtualKeyCode:90});
-    assert.equal(await evaluate("document.getElementById('source-editor').value"),beforeEdit,'Highlighting preserves native undo');
+    assert.equal(await evaluate("globalThis.__sourceEditor.getSource()"),beforeEdit,'Highlighting preserves native undo');
     await send('Emulation.setDeviceMetricsOverride',{width:390,height:844,deviceScaleFactor:1,mobile:true});
     await evaluate("document.getElementById('settings-toggle').click()");
     assert.equal(await evaluate("document.getElementById('settings-panel').getAttribute('aria-modal')==='true'&&document.querySelector('.editor-main').inert"),true,'Mobile settings is modal');
diff --git a/ext/demo-site/test/backend-probe.mjs b/ext/demo-site/test/backend-probe.mjs
@@ -12,29 +12,29 @@ export async function run(control,backend='haskell-wasm'){
  assert(/WASM fetch failed|HTTP|fetch/i.test(el('operation-diagnostic').textContent),'Runtime artifact failure is visible, no JS fallback');
  change('program-picker','demo:arithmetic');await status('Stopped');
  await fault({runtime:false});el('reload-package').click();await status('Ready');
- assert(!el('source-editor').hidden&&!el('source-editor').readOnly,'Retry after a fresh load failure restores editable demo source');
+ assert(!el('source-editor').hidden&&!globalThis.__sourceEditor.isReadOnly,'Retry after a fresh load failure restores editable demo source');
  await select('language-reference');
  assert(await inspect('leaf','tricu')==='t','Published stored binding');
  assert(!(await requests()).some(path=>path.endsWith('/compiler.json')),'Published inspection does not initialize compiler');
  for(const name of ['rgb','microscope','shipping','events','registration','migration'])await select(name);
  await select('language-reference');
- input('source-editor',el('source-editor').value.replace('first 42 7','first 43 7'));await status('Compiled');
+ input('source-editor',globalThis.__sourceEditor.getSource().replace('first 42 7','first 43 7'));await status('Compiled');
  assert(await inspect('answer','number')==='43','Edited source compiles');
  assert(/MiB WASM linear memory/.test(el('compiler-stats').textContent),'Native runtime statistics');
  await inspect('answer','string');assert(description().includes('Cannot interpret'),'Decoder errors are visible');
  assert(await inspect('answer','number')==='43','Decoder errors preserve compiled definitions');
- input('source-editor',el('source-editor').value+'\n-- revision');await status('Compiled');assert(await inspect('answer','number')==='43','New revision');
+ input('source-editor',globalThis.__sourceEditor.getSource()+'\n-- revision');await status('Compiled');assert(await inspect('answer','number')==='43','New revision');
  el('restore-source').click();await status('Ready');
  await fault({compilerPin:true});document.querySelector('[data-compiler-example=contracts]').click();await status('Compilation failed');
  assert(/Runtime compiler pin mismatch|HTTP|fetch/i.test(el('compile-diagnostic').textContent),'Compiler pin failure has no fallback');
  await fault({compilerPin:false});
  await select('names-values');
  const report=await(await import('/inline-io-probe.mjs')).run(control,backend);
- await select('shipping');input('source-editor',el('source-editor').value+'\n-- native imports');await status('Compiled');
+ await select('shipping');input('source-editor',globalThis.__sourceEditor.getSource()+'\n-- native imports');await status('Compiled');
  document.querySelector('[data-compiler-example=identity]').click();input('source-editor','answer = 42\nloop = (x : x x) (x : x x)');await status('Compiled');
  document.querySelector('[aria-label="Inspect compiled definition loop"]').click();await wait(()=>el('status').textContent==='Inspecting loop','CPU-bound observation');await pause(100);el('stop').click();
  assert(!el('compile').disabled,'Stop discards runtime and permits recompile');
- const source=el('source-editor').value;change('runtime-backend',backend==='haskell-wasm'?'zig-wasm':'haskell-wasm');await status('Compiled');assert(el('source-editor').value===source,'Backend switching preserves source');
+ const source=globalThis.__sourceEditor.getSource();change('runtime-backend',backend==='haskell-wasm'?'zig-wasm':'haskell-wasm');await status('Compiled');assert(globalThis.__sourceEditor.getSource()===source,'Backend switching preserves source');
  assert(await inspect('answer','number')==='42','Backend switch rebuilds independent definitions');
  await(await import('/backend-resume-probe.mjs')).probeResume(backend);
  const parity=backend==='zig-wasm'?await(await import('/zig-session-probe.mjs')).run():null;
diff --git a/ext/demo-site/test/backend-server.mjs b/ext/demo-site/test/backend-server.mjs
@@ -32,6 +32,7 @@ export async function startSiteServer(directory,autoRun=false) {
         res.end('ok');return;
       }
       if(path==='/source-probe-helpers.mjs'){res.setHeader('Content-Type','text/javascript');res.end(await readFile(new URL('./source-probe-helpers.mjs',import.meta.url)));return;}
+      if(path==='/import-folds-probe.mjs'){res.setHeader('Content-Type','text/javascript');res.end(await readFile(new URL('./import-folds-probe.mjs',import.meta.url)));return;}
       if(path==='/definition-names-probe.mjs'){res.setHeader('Content-Type','text/javascript');res.end(await readFile(new URL('./definition-names-probe.mjs',import.meta.url)));return;}
       if(path==='/inline-io-probe.mjs'){res.setHeader('Content-Type','text/javascript');res.end(await readFile(new URL('./inline-io-probe.mjs',import.meta.url)));return;}
       if(path==='/asset-cache-probe.mjs'){res.setHeader('Content-Type','text/javascript');res.end(await readFile(new URL('./asset-cache-probe.mjs',import.meta.url)));return;}
@@ -82,7 +83,7 @@ export async function startSiteServer(directory,autoRun=false) {
       if(moduleCorrupt&&path==='/_arboricx/bundle/hash/'+moduleCorrupt){bytes=Buffer.from(bytes);bytes[0]^=1;}
       if(process.env.TEST_COLD_LOAD&&path==='/nested/site/index.html')bytes=Buffer.from(bytes.toString().replace('<head>',`<head><script>new MutationObserver((_,observer)=>{if(document.getElementById('status')?.textContent==='Ready'){globalThis.__readyMs=performance.now();observer.disconnect();}}).observe(document.documentElement,{childList:true,subtree:true,characterData:true});</script>`));
       if(autoRun&&path==='/nested/site/index.html'&&!new URL(req.url,'http://localhost').searchParams.has('noProbe'))bytes=Buffer.from(bytes.toString()+`<script type="module">
-        try{const m=await import(${JSON.stringify(process.env.TEST_DEFINITION_NAMES?'/definition-names-probe.mjs':process.env.TEST_INLINE_IO?'/inline-io-probe.mjs':process.env.TEST_BASIC_EXAMPLES?'/basic-examples-probe.mjs':process.env.TEST_IMPORT_PICKER?'/import-picker-probe.mjs':process.env.TEST_COLD_LOAD?'/cold-load-probe.mjs':process.env.TEST_ASSET_CACHE?'/asset-cache-probe.mjs':process.env.TEST_LOCAL_MODULES?'/local-module-probe.mjs':process.env.TEST_MODULES?'/module-probe.mjs':process.env.TEST_IDE?'/ide-probe.mjs':process.env.TEST_LIVE_UX?'/live-ux-probe.mjs':process.env.TEST_BENCHMARK?'/backend-benchmark.mjs':'/backend-probe.mjs')});const report=await m.run(${JSON.stringify(control)},${JSON.stringify(process.env.TEST_BACKEND||'haskell-wasm')},${!!process.env.BENCHMARK_PSS});await fetch(${JSON.stringify(control+'/report')},{method:'POST',body:JSON.stringify({ok:true,report})});}
+        try{const m=await import(${JSON.stringify(process.env.TEST_IMPORT_FOLDS?'/import-folds-probe.mjs':process.env.TEST_DEFINITION_NAMES?'/definition-names-probe.mjs':process.env.TEST_INLINE_IO?'/inline-io-probe.mjs':process.env.TEST_BASIC_EXAMPLES?'/basic-examples-probe.mjs':process.env.TEST_IMPORT_PICKER?'/import-picker-probe.mjs':process.env.TEST_COLD_LOAD?'/cold-load-probe.mjs':process.env.TEST_ASSET_CACHE?'/asset-cache-probe.mjs':process.env.TEST_LOCAL_MODULES?'/local-module-probe.mjs':process.env.TEST_MODULES?'/module-probe.mjs':process.env.TEST_IDE?'/ide-probe.mjs':process.env.TEST_LIVE_UX?'/live-ux-probe.mjs':process.env.TEST_BENCHMARK?'/backend-benchmark.mjs':'/backend-probe.mjs')});const report=await m.run(${JSON.stringify(control)},${JSON.stringify(process.env.TEST_BACKEND||'haskell-wasm')},${!!process.env.BENCHMARK_PSS});await fetch(${JSON.stringify(control+'/report')},{method:'POST',body:JSON.stringify({ok:true,report})});}
         catch(e){await fetch(${JSON.stringify(control+'/report')},{method:'POST',body:JSON.stringify({ok:false,error:String(e)+'\\n'+(e.stack||'')})});}
       </script>`);
       if(process.env.TEST_ASSET_CACHE && ['/nested/site/index.html','/nested/site/assets.json'].includes(path))res.setHeader('Cache-Control','no-cache');
diff --git a/ext/demo-site/test/backend-webkit.mjs b/ext/demo-site/test/backend-webkit.mjs
@@ -5,16 +5,19 @@ import {tmpdir} from 'node:os';
 import {join} from 'node:path';
 import {startSiteServer} from './backend-server.mjs';
 const {webkit}=await import(process.env.PLAYWRIGHT_MODULE);
-const {server,url,completion}=await startSiteServer(process.argv[2]||'unused',true);
+const {server,url,completion,marks}=await startSiteServer(process.argv[2]||'unused',true);
 const profile=await mkdtemp(join(tmpdir(),'tricu-webkit-'));
-let browser,timer;
+const timeoutMs=Number(process.env.TEST_WEBKIT_TIMEOUT_MS??240000);
+assert(Number.isSafeInteger(timeoutMs)&&timeoutMs>=1000&&timeoutMs<=600000);
+let browser,timer,diagnostics;
 try {
  // Match the other browser harnesses: a fresh disk-backed profile per run.
  browser=await webkit.launchPersistentContext(profile,{headless:true,viewport:{width:1280,height:900}});
  const page=await browser.newPage(),errors=[];
  page.on('pageerror',e=>errors.push(String(e)));
  await page.goto(url);
- const report=await Promise.race([completion,new Promise((_,reject)=>{timer=setTimeout(()=>reject(Error('WebKit probe timeout')),240000);})]);
+ if(process.env.TEST_DIAGNOSTICS)diagnostics=setInterval(()=>{void page.evaluate(()=>({status:document.getElementById('status')?.textContent,activity:document.getElementById('compile-activity')?.textContent})).then(state=>console.log('Page:',JSON.stringify(state))).catch(()=>{});},30000);
+ const report=await Promise.race([completion,new Promise((_,reject)=>{timer=setTimeout(()=>reject(Error('WebKit probe timeout; phases: '+JSON.stringify(marks.slice(-4)))),timeoutMs);})]);
  assert.deepEqual(errors,[]);
  if(process.env.TEST_IMPORT_PICKER){
   await page.click('#add-import');
@@ -27,7 +30,7 @@ try {
  }
  for(const width of [320,390,1280]){
   await page.setViewportSize({width,height:844});
-  // Let ResizeObserver update the textarea's decorative mirror geometry.
+  // Let CodeMirror measure its editable viewport.
   await page.evaluate(()=>new Promise(resolve=>requestAnimationFrame(()=>requestAnimationFrame(resolve))));
   if(process.env.TEST_IMPORT_PICKER)assert(await page.evaluate(()=>{
    const content=document.querySelector('#import-content').getBoundingClientRect();
@@ -45,6 +48,6 @@ try {
 
  console.log('PASS '+report.engine+': '+report.checks.join(' / '));
 } finally {
- clearTimeout(timer);await browser?.close();server.closeAllConnections();await new Promise(r=>server.close(r));
+ clearTimeout(timer);clearInterval(diagnostics);await browser?.close();server.closeAllConnections();await new Promise(r=>server.close(r));
  await rm(profile,{recursive:true,force:true});
 }
diff --git a/ext/demo-site/test/basic-examples-probe.mjs b/ext/demo-site/test/basic-examples-probe.mjs
@@ -1,7 +1,7 @@
 import {evaluateSource,inspect} from './source-probe-helpers.mjs';
 const el=id=>document.getElementById(id),delay=ms=>new Promise(r=>setTimeout(r,ms));
 const assert=(ok,message)=>{if(!ok)throw Error(message);};
-const input=(id,value)=>{el(id).value=value;el(id).dispatchEvent(new Event('input'));};
+const input=(id,value)=>{if(id==='source-editor'){globalThis.__sourceEditor.replaceSource(value,true);return;}el(id).value=value;el(id).dispatchEvent(new Event('input'));};
 const change=(id,value)=>{el(id).value=value;el(id).dispatchEvent(new Event('change'));};
 async function status(want){for(let i=0;i<4500;i++){if(el('status').textContent===want)return;await delay(20);}throw Error(want+': '+el('status').textContent+' / '+el('compile-diagnostic').textContent+' / '+el('operation-diagnostic').textContent);}
 export async function run(control,backend='haskell-wasm'){
@@ -24,7 +24,7 @@ export async function run(control,backend='haskell-wasm'){
  const evaluate=async(expression,output,expected)=>assert(await evaluateSource(expression,output)===expected,expression+' expected '+expected);
  const defaults=[['greeting','string','Hello, world!'],['total','number','12'],['double 6','number','12'],['count','number','3'],['total','number','24'],['message 0','string','Your basket is empty.']];
  for(let i=0;i<basics.length;i++){
-  await select(basics[i]);const original=el('source-editor').value;
+  await select(basics[i]);const original=globalThis.__sourceEditor.getSource();
   await evaluate(...defaults[i]);
   if(!el('restore-source').hidden){el('restore-source').click();await status('Ready');}
   if(i===0){input('source-editor',original.replace('answer = 42','answer = 7'));await status('Compiled');await evaluate('answer','number','7');}
@@ -33,7 +33,7 @@ export async function run(control,backend='haskell-wasm'){
   if(i===3){input('source-editor',original.replace('numbers = [2 4 6]','numbers = [2 4 6 8]'));await status('Compiled');await evaluate('count','number','4');await evaluate('total','number','20');input('source-editor',original.replace('numbers = [2 4 6]','numbers = []'));await status('Compiled');await evaluate('count','number','0');await evaluate('total','number','0');}
   if(i===4){input('source-editor',original.replace('Math.multiply number 2','Math.multiply number 3'));await status('Compiled');await evaluate('total','number','36');}
   if(i===5){input('source-editor',original.replace('message _ =','message 2 = "You have two items."\nmessage _ ='));await status('Compiled');await evaluate('message 2','string','You have two items.');await evaluate('message 4','string','You have several items.');}
-  el('restore-source').click();await status('Ready');assert(el('source-editor').value===original,'Restore '+basics[i]);
+  el('restore-source').click();await status('Ready');assert(globalThis.__sourceEditor.getSource()===original,'Restore '+basics[i]);
  }
  await select('language-reference');
  const catalogue=await(await fetch(new URL('catalogue.json',base))).json();
diff --git a/ext/demo-site/test/definition-name-inputs.mjs b/ext/demo-site/test/definition-name-inputs.mjs
@@ -25,55 +25,54 @@ export async function definitionNameInputs({send,evaluate,report,prefix}){
   await send('Emulation.setDeviceMetricsOverride',{width,height:1000,deviceScaleFactor:1,mobile:width<741});
   await evaluate("new Promise(resolve=>requestAnimationFrame(()=>requestAnimationFrame(resolve)))");
   await mouse(target);await inspect();
-  assert(await evaluate("document.activeElement.id!=='source-editor'"),'Inspection does not focus the textarea/open its keyboard');
-  const expected=await evaluate("document.getElementById('source-editor').value");
+  assert(await evaluate("document.activeElement!==globalThis.__sourceEditor.view.contentDOM"),'Inspection keeps focus outside the editing surface');
+  const expected=await evaluate("globalThis.__sourceEditor.getSource()");
   await mouse(`document.querySelector('.edit-definition-name')`);
-  assert(await evaluate("document.activeElement.id==='source-editor'&&document.getElementById('source-editor').value.slice(document.getElementById('source-editor').selectionStart,document.getElementById('source-editor').selectionEnd)==='answer'"),'Trusted Edit name focuses and selects the native identifier');
+  assert(await evaluate("document.activeElement===globalThis.__sourceEditor.view.contentDOM&&globalThis.__sourceEditor.getSource().slice(globalThis.__sourceEditor.getSelection().from,globalThis.__sourceEditor.getSelection().to)==='answer'"),'Trusted Edit name focuses and selects the native identifier');
   await send('Input.insertText',{text:'renamed'});
-  assert.equal(await evaluate("document.getElementById('source-editor').value"),expected.replace('answer =','renamed ='),'Native typing replaces only the declaration name');
+  assert.equal(await evaluate("globalThis.__sourceEditor.getSource()"),expected.replace('answer =','renamed ='),'Native typing replaces only the declaration name');
   await key('z','KeyZ',90,2);
-  assert.equal(await evaluate("document.getElementById('source-editor').value"),expected,'Rename has native undo');
+  assert.equal(await evaluate("globalThis.__sourceEditor.getSource()"),expected,'Rename has native undo');
   await wait("document.getElementById('status').textContent==='Compiled'",'undo compile');
-  await evaluate(`document.getElementById('source-editor').focus({preventScroll:true})`);await key('Tab','Tab',9);
+  await evaluate(`globalThis.__sourceEditor.focus()`);await key('Tab','Tab',9);
   assert(await evaluate(`document.activeElement===${target}`),'Tab reaches the declaration name');
   await key('Enter','Enter',13);await inspect();
   assert(await evaluate("document.activeElement===document.querySelector('.definition-card pre')"),'Keyboard inspection focuses the result');
   await key('Escape','Escape',27);
   assert(await evaluate(`${closed}&&document.activeElement===${target}`),'Escape returns keyboard focus to the definition name / '+JSON.stringify(await evaluate(`({active:document.activeElement.outerHTML.slice(0,250),hidden:${closed},target:${target}.outerHTML,scroll:document.getElementById('source-editor').scrollTop,status:document.getElementById('status').textContent})`)));
   await key(' ','Space',32);await inspect();await close();
-  // Clicking the RHS remains normal caret placement, not inspection.
-  const rhs=await evaluate("(()=>{const s=[...document.querySelectorAll('.syntax-viewport .syntax-definition')].find(s=>s.textContent==='answer').getBoundingClientRect();return {x:s.right+parseFloat(getComputedStyle(document.getElementById('source-editor')).fontSize)*1.5,y:s.y+s.height/2};})()");
+  // Clicking the RHS places the editing caret.
+  const rhs=await evaluate("(()=>{const s=[...document.querySelectorAll('.cm-content .syntax-definition')].find(s=>s.textContent==='answer').getBoundingClientRect();return {x:s.right+parseFloat(getComputedStyle(document.getElementById('source-editor')).fontSize)*1.5,y:s.y+s.height/2};})()");
   await send('Input.dispatchMouseEvent',{type:'mousePressed',...rhs,button:'left',clickCount:1});
   await send('Input.dispatchMouseEvent',{type:'mouseReleased',...rhs,button:'left',clickCount:1});
-  assert(await evaluate(`${closed}&&document.activeElement.id==='source-editor'`),'RHS click edits normally');
+  assert(await evaluate(`${closed}&&document.activeElement===globalThis.__sourceEditor.view.contentDOM`),'RHS click edits normally');
   const p=await point(target);
   await send('Input.dispatchTouchEvent',{type:'touchStart',touchPoints:[{...p,radiusX:2,radiusY:2}]});
   await send('Input.dispatchTouchEvent',{type:'touchEnd',touchPoints:[]});await inspect();
-  assert(await evaluate("document.activeElement.id!=='source-editor'"),'Touch inspection leaves the editing keyboard closed');
+  assert(await evaluate("document.activeElement!==globalThis.__sourceEditor.view.contentDOM"),'Touch inspection leaves the editing keyboard closed');
   await close();
 
   const hold=await point(target);
   await send('Input.dispatchTouchEvent',{type:'touchStart',touchPoints:[{...hold,radiusX:2,radiusY:2}]});
   await pause(750);await send('Input.dispatchTouchEvent',{type:'touchEnd',touchPoints:[]});await pause(100);
   assert(await evaluate(closed),'Real touch hold does not inspect');
-  assert(await evaluate("document.activeElement.id==='source-editor'&&document.getElementById('source-editor').value.slice(document.getElementById('source-editor').selectionStart,document.getElementById('source-editor').selectionEnd)==='answer'"),'Touch hold selects the identifier in the native editor / '+JSON.stringify(await evaluate(`({active:document.activeElement.outerHTML.slice(0,200),start:document.getElementById('source-editor').selectionStart,end:document.getElementById('source-editor').selectionEnd,target:${target}.outerHTML})`)));
+  assert(await evaluate("document.activeElement===globalThis.__sourceEditor.view.contentDOM&&globalThis.__sourceEditor.getSource().slice(globalThis.__sourceEditor.getSelection().from,globalThis.__sourceEditor.getSelection().to)==='answer'"),'Touch hold selects the identifier in the native editor / '+JSON.stringify(await evaluate(`({active:document.activeElement.outerHTML.slice(0,200),start:globalThis.__sourceEditor.getSelection().from,end:globalThis.__sourceEditor.getSelection().to,target:${target}.outerHTML})`)));
   await evaluate('document.getSelection().removeAllRanges()');
-  await evaluate(`document.getElementById('source-editor').setSelectionRange(0,0);${target}.focus({preventScroll:true})`);
+  await evaluate(`globalThis.__sourceEditor.select(0);${target}.focus({preventScroll:true})`);
   const pan=await point(target);
   await send('Input.dispatchTouchEvent',{type:'touchStart',touchPoints:[pan]});
   await send('Input.dispatchTouchEvent',{type:'touchMove',touchPoints:[{x:pan.x,y:pan.y+40}]});
   await pause(550);await send('Input.dispatchTouchEvent',{type:'touchEnd',touchPoints:[]});
-  assert(await evaluate(`${closed}&&document.getElementById('source-editor').selectionStart===0&&document.getElementById('source-editor').selectionEnd===0`),'Touch panning cancels the hold without selecting or inspecting');
-  // Start in ordinary text and drag across a clickable name. The textarea,
-  // not the overlay, must own the native selection throughout the gesture.
-  const drag=await evaluate("(()=>{const w=document.getElementById('source-editor').closest('.syntax-editor'),a=w.querySelector('.syntax-directive').getBoundingClientRect(),b=w.querySelector('[data-definition=identity]').getBoundingClientRect();return {from:{x:a.left+2,y:a.top+a.height/2},to:{x:b.left+b.width/2,y:b.top+b.height/2}};})()");
+  assert(await evaluate(`${closed}&&globalThis.__sourceEditor.getSelection().from===0&&globalThis.__sourceEditor.getSelection().to===0`),'Touch panning cancels the hold without selecting or inspecting');
+  // Drag from ordinary text across a clickable name using editor selection.
+  const drag=await evaluate("(()=>{const w=document.getElementById('source-editor'),a=w.querySelector('.syntax-directive').getBoundingClientRect(),b=w.querySelector('[data-definition=identity]').getBoundingClientRect();return {from:{x:a.left+2,y:a.top+a.height/2},to:{x:b.left+b.width/2,y:b.top+b.height/2}};})()");
   await send('Input.dispatchMouseEvent',{type:'mousePressed',...drag.from,button:'left',clickCount:1});
   await send('Input.dispatchMouseEvent',{type:'mouseMoved',...drag.to,button:'left',buttons:1});
   await send('Input.dispatchMouseEvent',{type:'mouseReleased',...drag.to,button:'left',clickCount:1});
-  assert(await evaluate(`${closed}&&document.getElementById('source-editor').value.slice(document.getElementById('source-editor').selectionStart,document.getElementById('source-editor').selectionEnd).includes('answer = 42')`),'Native drag selection crosses name decorations without inspecting');
-  // A native range selection remains possible in the underlying textarea.
-  await evaluate("(()=>{const e=document.getElementById('source-editor');e.focus();e.setSelectionRange(e.value.indexOf('identity x'),e.value.indexOf('identity x')+14);e.dispatchEvent(new Event('select'));})()");
-  assert(await evaluate("document.getElementById('source-editor').selectionEnd>document.getElementById('source-editor').selectionStart"),'Native source selections survive name decoration');
+  assert(await evaluate(`${closed}&&globalThis.__sourceEditor.getSource().slice(globalThis.__sourceEditor.getSelection().from,globalThis.__sourceEditor.getSelection().to).includes('answer = 42')`),'Native drag selection crosses name decorations without inspecting');
+  // Select an identifier range in the canonical document.
+  await evaluate("(()=>{const e=globalThis.__sourceEditor,start=e.getSource().indexOf('identity x');e.select(start,start+14);})()");
+  assert(await evaluate("globalThis.__sourceEditor.getSelection().to>globalThis.__sourceEditor.getSelection().from"),'Native source selections survive name decoration');
   if(prefix){
    await evaluate("document.activeElement.blur();window.scrollTo({top:0,behavior:'instant'})");
    const capture=async suffix=>{
diff --git a/ext/demo-site/test/definition-names-probe.mjs b/ext/demo-site/test/definition-names-probe.mjs
@@ -1,5 +1,5 @@
-// Actual compiled definitions and shipped editor controls; no evaluator substitute.
-import {el,input,change,status,wait,inspect,card,result,pause} from './source-probe-helpers.mjs';
+// Compiled-definition inspection through the shipped editor controls.
+import {el,input,change,status,wait,inspect,card,result,pause,sourceEditor} from './source-probe-helpers.mjs';
 const assert=(ok,message)=>{if(!ok)throw Error(message);};
 export async function run(control,backend='haskell-wasm'){
  await status('Ready');
@@ -18,24 +18,23 @@ outer x = let
 select [] = 0
 select xs = 1
 -- comment = 1`;
- const editor=el('source-editor'),wrapper=editor.closest('.syntax-editor');
- input('source-editor',source);await status('Compiled');editor.scrollTop=0;editor.dispatchEvent(new Event('scroll'));
+ const editor=sourceEditor,wrapper=editor.dom;
+ input('source-editor',source);await status('Compiled');editor.view.scrollDOM.scrollTop=0;
  await pause(0);
  const target=name=>wrapper.querySelector(`[data-definition="${name}"]`);
  assert(!wrapper.querySelector('.definition-gutter'),'No gutter');
- assert(parseFloat(getComputedStyle(editor).paddingLeft)<=20,'No reserved horizontal inspection column');
+ assert(parseFloat(getComputedStyle(wrapper).paddingLeft)<=20,'No reserved horizontal inspection column');
  const names=[...new Set([...wrapper.querySelectorAll('[data-definition]')].map(button=>button.dataset.definition))];
  assert(JSON.stringify(names)===JSON.stringify(['answer','identity',long,'text','outer','select']),'Only unique top-level declaration heads are interactive');
  assert(!target('local')&&!target('x')&&!target('fake')&&!target('comment'),'No local variables, references, comments or string lookalikes');
- assert(!target('answer').hidden&&!target('answer').disabled&&target('answer').tabIndex===0,'Compiled names are keyboard accessible');
+ assert(!target('answer').hidden&&target('answer').getAttribute('aria-disabled')==='false'&&target('answer').tabIndex===0,'Compiled names are keyboard accessible');
  assert(await inspect('answer')==='42','Name opens the actual retained definition');
  assert(target('answer').getAttribute('aria-expanded')==='true','Open name highlighted');
  card().querySelector('.edit-definition-name').click();
  const offset=source.indexOf('answer =');
- assert(card().hidden&&document.activeElement===editor&&editor.selectionStart===offset&&editor.selectionEnd===offset+6,'Edit name selects exactly the declaration, not its export or references');
- assert(editor.value===source,'Opening/closing and Edit name do not mutate source');
- // Selection/hold/drag must not accidentally inspect. These DOM cases complement
- // the harness's trusted mouse, touch and keyboard input.
+ assert(card().hidden&&document.activeElement===editor.view.contentDOM&&editor.getSelection().from===offset&&editor.getSelection().to===offset+6,'Edit name selects exactly the declaration, not its export or references');
+ assert(editor.getSource()===source,'Opening/closing and Edit name do not mutate source');
+ // Selection, hold and drag checks complement trusted mouse/touch/keyboard input.
  const button=target('answer');
  const down=()=>button.dispatchEvent(new PointerEvent('pointerdown',{clientX:10,clientY:10,pointerId:1,bubbles:true}));
  const click=()=>button.dispatchEvent(new MouseEvent('click',{detail:1,bubbles:true}));
@@ -43,41 +42,26 @@ select xs = 1
  down();button.dispatchEvent(new PointerEvent('pointermove',{clientX:30,clientY:10,pointerId:1,bubbles:true}));click();assert(card().hidden,'Dragging is not a tap');
  down();const menu=new MouseEvent('contextmenu',{bubbles:true,cancelable:true});button.dispatchEvent(menu);click();assert(!menu.defaultPrevented&&card().hidden,'Native context menu is not intercepted');
  down();document.getSelection().selectAllChildren(button);click();assert(card().hidden,'Selecting the identifier does not inspect');document.getSelection().removeAllRanges();
- editor.dispatchEvent(new CompositionEvent('compositionstart'));
- assert(getComputedStyle(wrapper.querySelector('.definition-targets')).display==='none','IME has no overlapping inspection targets');
- editor.dispatchEvent(new CompositionEvent('compositionend'));
- input('source-editor',source.replaceAll('answer','renamed'));
- assert([...wrapper.querySelectorAll('[data-definition]')].every(button=>button.disabled||button.hidden),'Dirty names lose clickability immediately');
+ wrapper.dispatchEvent(new CompositionEvent('compositionstart'));
+ assert(getComputedStyle(target('answer')).pointerEvents==='none','IME disables name pointer activation');
+ wrapper.dispatchEvent(new CompositionEvent('compositionend'));
+ input('source-editor',source.replaceAll('answer','renamed'));await pause(0);
+ assert([...wrapper.querySelectorAll('[data-definition]')].every(button=>button.getAttribute('aria-disabled')==='true'||button.hidden),'Dirty names lose clickability immediately');
  await status('Compiled');assert(await inspect('renamed')==='42','Renamed definition resolves from the new compiled revision');
  input('source-editor','!export renamed\nrenamed = missing');await status('Compilation failed');
- assert([...wrapper.querySelectorAll('[data-definition]')].every(button=>button.disabled&&button.hidden),'Failed compilation leaves no clickable underline');
- input('source-editor',source);await status('Compiled');editor.scrollTop=0;editor.dispatchEvent(new Event('scroll'));await pause(0);
- // Long declaration names wrap without stealing the expression's hit area.
- const mirror=wrapper.querySelector('.syntax-viewport pre');
- const span=[...mirror.querySelectorAll('.syntax-definition')].find(span=>span.textContent===long);
- const boxes=[...span.getClientRects()];
- const targets=[...wrapper.querySelectorAll(`[data-definition="${long}"]`)];
- assert(targets.length===boxes.length,'Every wrapped fragment has its own target');
- for(let i=0;i<boxes.length;i++){
-  const rect=targets[i].getBoundingClientRect();
-  assert(Math.abs(rect.left-boxes[i].left)<1&&Math.abs(rect.width-boxes[i].width)<1,'No hit area extends over adjacent expression text');
- }
- assert(targets.filter(button=>button.tabIndex===0).length===1,'Wrapped definition has one tab stop');
- if(boxes.length>1){
-  editor.style.height='240px';await new Promise(resolve=>requestAnimationFrame(()=>requestAnimationFrame(resolve)));
-  editor.scrollTop=span.getClientRects()[0].top-editor.getBoundingClientRect().top+parseFloat(getComputedStyle(editor).lineHeight);
-  editor.dispatchEvent(new Event('scroll'));
-  const visible=[...wrapper.querySelectorAll(`[data-definition="${long}"]`)].filter(button=>!button.hidden);
-  assert(visible.length>0&&visible[0].tabIndex===0,'A partially scrolled wrapped name retains a visible keyboard stop');
-  visible[0].click();await pause(0);await wait(()=>!card().querySelector('select').disabled&&result()==='9','wrapped observation');
-  card().querySelector('[aria-label="Close definition inspection"]').click();
-  assert(document.activeElement===visible[0],'Close returns focus to a visible fragment, not its offscreen first line');
-  editor.style.height='';editor.scrollTop=0;editor.dispatchEvent(new Event('scroll'));
-  await new Promise(resolve=>requestAnimationFrame(()=>requestAnimationFrame(resolve)));
+ assert([...wrapper.querySelectorAll('[data-definition]')].every(button=>button.getAttribute('aria-disabled')==='true'&&button.hidden),'Failed compilation leaves no clickable underline');
+ input('source-editor',source);await status('Compiled');editor.view.scrollDOM.scrollTop=0;await pause(0);
+ // Wrapped declaration fragments retain their inline text hit areas.
+ const span=target(long);span.scrollIntoView({block:'center',behavior:'instant'});await new Promise(r=>requestAnimationFrame(()=>requestAnimationFrame(r)));const boxes=[...span.getClientRects()];
+ assert(boxes.length>0&&span.tabIndex===0,'Wrapped inline name has one keyboard stop');
+ for(const box of boxes){
+  const hit=document.elementFromPoint(box.left+Math.min(3,box.width/2),box.top+box.height/2);
+  assert(hit&&span.contains(hit),'Every visible name fragment has its own native inline hit area: '+JSON.stringify({box,hit:hit?.outerHTML.slice(0,180),window:innerHeight}));
  }
+ assert(!wrapper.querySelector('.definition-targets'),'No manual overlay rectangles');
  assert(await inspect(long)==='9','Wrapped private definition is inspectable');
  card().querySelector('[aria-label="Close definition inspection"]').click();
  assert(document.activeElement===target(long),'Closing returns focus to the name');
- editor.scrollTop=0;editor.dispatchEvent(new Event('scroll'));
+ editor.view.scrollDOM.scrollTop=0;
  return {userAgent:navigator.userAgent,checks:['underlined definition names without a gutter; exact wrapped hit areas; unique heads only; retained/private inspection; Edit name and focus; dirty/error invalidation; native context menus; hold/drag/selection suppression; IME; one keyboard stop per name']};
 }
diff --git a/ext/demo-site/test/firefox-idle.mjs b/ext/demo-site/test/firefox-idle.mjs
@@ -37,8 +37,8 @@ const snapshot=context=>evaluate(context,`(()=>{
   const get=id=>document.getElementById(id);
   return {at:new Date().toISOString(),visibility:document.visibilityState,status:get('status')?.textContent,
     backend:get('runtime-backend')?.value,program:get('program-picker')?.value,
-    sourceHidden:get('source-editor')?.hidden,sourceReadOnly:get('source-editor')?.readOnly,
-    sourceDisabled:get('source-editor')?.disabled,source:get('source-editor')?.value,
+    sourceHidden:get('source-editor')?.hidden,sourceReadOnly:globalThis.__sourceEditor?.isReadOnly,
+    sourceDisabled:globalThis.__sourceEditor?.isDisabled,source:globalThis.__sourceEditor?.getSource(),
     result:document.querySelector('.definition-card pre')?.textContent,
     diagnostic:get('compile-diagnostic')?.textContent,inspectionDisabled:document.querySelector('.definition-card select')?.disabled,
     errors:window.__idleErrors,visibilityChanges:window.__idleVisibility};
@@ -49,7 +49,7 @@ async function wait(context,condition,label){
   throw Error('Timeout '+label+': '+JSON.stringify(await snapshot(context)));
 }
 const status=(context,text)=>wait(context,`document.getElementById('status')?.textContent===${JSON.stringify(text)}`,text);
-const input=(context,id,value)=>evaluate(context,`(()=>{const e=document.getElementById(${JSON.stringify(id)});e.value=${JSON.stringify(value)};e.dispatchEvent(new Event('input'));})()`);
+const input=(context,id,value)=>evaluate(context,`(()=>{const e=document.getElementById(${JSON.stringify(id)});if(${JSON.stringify(id)}==='source-editor'){globalThis.__sourceEditor.replaceSource(${JSON.stringify(value)},true);}else{e.value=${JSON.stringify(value)};e.dispatchEvent(new Event('input'));}})()`);
 const change=(context,id,value)=>evaluate(context,`(()=>{const e=document.getElementById(${JSON.stringify(id)});e.value=${JSON.stringify(value)};e.dispatchEvent(new Event('change'));})()`);
 const click=(context,id)=>evaluate(context,`document.getElementById(${JSON.stringify(id)}).click()`);
 async function editable(context){
@@ -83,7 +83,7 @@ async function exercise(job){
   await run(context,'answer',mode==='compiled'?'43':'42');
   for(let cycle=0;cycle<2;cycle++){
     await select(context,'arithmetic');await run(context,'total','12');
-    const source=await evaluate(context,"document.getElementById('source-editor').value");
+    const source=await evaluate(context,"globalThis.__sourceEditor.getSource()");
     assert(source.includes('Math.add 5 7'),'Known independently checked arithmetic specimen');
     await input(context,'source-editor',source.replace('Math.add 5 7','Math.add 8 9'));
     await status(context,'Compiled');await run(context,'total','17');
@@ -136,9 +136,9 @@ try{
       window.addEventListener('unhandledrejection',event=>window.__idleErrors.push({type:'rejection',message:String(event.reason)}));
       document.addEventListener('visibilitychange',()=>window.__idleVisibility.push({visibility:document.visibilityState,at:Date.now()}));
     })()`);
-    await status(context,'Ready');
+    await status(context,'Ready');await evaluate(context,"import('/source-probe-helpers.mjs').then(()=>true)");
     if(mode==='compiled'){
-      const source=await evaluate(context,"document.getElementById('source-editor').value");
+      const source=await evaluate(context,"globalThis.__sourceEditor.getSource()");
       assert(source.includes('answer = 42'));await input(context,'source-editor',source.replace('answer = 42','answer = 43'));
       await status(context,'Compiled');
     }
diff --git a/ext/demo-site/test/import-fold-inputs.mjs b/ext/demo-site/test/import-fold-inputs.mjs
@@ -0,0 +1,44 @@
+// Trusted input on the packaged Playground's canonical editor document.
+import assert from 'node:assert/strict';
+import {writeFile} from 'node:fs/promises';
+const pause=ms=>new Promise(r=>setTimeout(r,ms));
+export async function importFoldInputs({send,evaluate,report,prefix}){
+ const e='globalThis.__sourceEditor',initial=report.source;
+ const wait=async condition=>{for(let i=0;!await evaluate(condition);i++){assert(i<1600,condition);await pause(25);}};
+ const key=async(key,code,vk,modifiers=0)=>{await send('Input.dispatchKeyEvent',{type:'keyDown',key,code,windowsVirtualKeyCode:vk,modifiers,...(key==='Enter'?{text:'\r'}:{})});await send('Input.dispatchKeyEvent',{type:'keyUp',key,code,windowsVirtualKeyCode:vk,modifiers});await pause(30);};
+ const point=async expression=>evaluate(`(()=>{const element=${expression};element.scrollIntoView({block:'center',behavior:'instant'});const r=element.getBoundingClientRect();return {x:r.left+r.width*.25,y:r.top+r.height/2};})()`);
+ const click=async expression=>{const p=await point(expression);await send('Input.dispatchMouseEvent',{type:'mousePressed',...p,button:'left',clickCount:1});await send('Input.dispatchMouseEvent',{type:'mouseReleased',...p,button:'left',clickCount:1});await pause(50);};
+ const widget=`${e}.dom.querySelector('.import-hash')`,alias=`[...${e}.dom.querySelectorAll('.syntax-name')].find(span=>span.textContent==='N')`;
+ const counts=`({folded:${e}.dom.querySelectorAll('.import-hash').length,full:${e}.dom.querySelectorAll('.import-hash-full').length})`;
+ await send('Browser.grantPermissions',{origin:await evaluate('location.origin'),permissions:['clipboardReadWrite','clipboardSanitizedWrite']});
+ for(const width of [390,1440]){
+  await send('Emulation.setDeviceMetricsOverride',{width,height:1000,deviceScaleFactor:1,mobile:width<741});
+  await evaluate(`${e}.replaceSource(${JSON.stringify(initial)},true)`);await wait("document.getElementById('status').textContent==='Compiled'");
+  assert.deepEqual(await evaluate(counts),{folded:3,full:0});
+  await click(widget);await key('Enter','Enter',13);assert((await evaluate(`${widget}.textContent`)).includes('...'),'Keyboard toggles are presentation only');
+  await click(alias);assert.deepEqual(await evaluate(counts),{folded:2,full:1});
+  assert.equal(await evaluate(`${e}.getSelection().from`),initial.indexOf(' as N')+4,'Caret maps past hidden 64-character hash');
+  await send('Input.insertText',{text:'M'});await key('z','KeyZ',90,2);assert.equal(await evaluate(`${e}.getSource()`),initial,'Typing undo');
+  await evaluate(`${e}.select(${initial.indexOf('!import')},${initial.indexOf('!import '+report.math+' as P')})`);
+  assert.deepEqual(await evaluate(counts),{folded:1,full:2});
+  await key('c','KeyC',67,2);const selected=await evaluate('navigator.clipboard.readText()');assert(selected.includes(report.math)&&!selected.includes('...'),'Partial selection copies complete hashes');
+  await key('a','KeyA',65,2);await key('c','KeyC',67,2);assert.equal(await evaluate('navigator.clipboard.readText()'),initial,'Native full-source clipboard');
+  await evaluate(`${e}.select(0)`);const inserted=`!import ${report.math} as Q\n`;
+  await send('Input.insertText',{text:inserted});await pause(30);assert.equal((await evaluate(counts)).folded,4,'Pasted import gains fold');
+  await key('z','KeyZ',90,2);assert.equal(await evaluate(`${e}.getSource()`),initial,'Undo restores source after dynamic decoration');
+  await key('Z','KeyZ',90,10);assert.equal(await evaluate(`${e}.getSource()`),inserted+initial,'Redo restores source after dynamic decoration');await key('z','KeyZ',90,2);
+  await evaluate(`${e}.select(${initial.length})`);const p=await point(alias);
+  await send('Input.dispatchTouchEvent',{type:'touchStart',touchPoints:[p]});await send('Input.dispatchTouchEvent',{type:'touchEnd',touchPoints:[]});await pause(80);
+  assert.deepEqual(await evaluate(counts),{folded:2,full:1},'Touch reveals only the touched import line');
+  await evaluate(`${e}.select(${initial.indexOf(report.math)+64})`);await key('Backspace','Backspace',8);assert.equal((await evaluate(`${e}.getSource()`)).length,initial.length-1,'Hash editing deletes one character');await key('z','KeyZ',90,2);assert.equal(await evaluate(`${e}.getSource()`),initial);
+  await wait("document.getElementById('status').textContent==='Compiled'");await evaluate(`${e}.setAvailability(true,false)`);
+  await send('Input.insertText',{text:'MUST NOT EDIT'});assert.equal(await evaluate(`${e}.getSource()`),initial,'Busy/read-only blocks native edits');await evaluate(`${e}.setAvailability(false,false)`);
+  if(prefix){const {cssContentSize:r}=await send('Page.getLayoutMetrics');const shot=await send('Page.captureScreenshot',{format:'png',captureBeyondViewport:true,clip:{x:0,y:0,width:r.width,height:r.height,scale:1}});await writeFile(prefix+'-folds-'+width+'.png',Buffer.from(shot.data,'base64'));}
+ }
+ // Enter inserts a plain newline; read-only state also applies to command keys.
+ await evaluate(`${e}.replaceSource('  answer = 42',true);${e}.select(${('  answer = 42').length})`);await key('Enter','Enter',13);
+ assert.equal(await evaluate(`${e}.getSource()`),'  answer = 42\n','Enter inserts exactly one newline');
+ await evaluate(`${e}.setAvailability(true,false)`);await key('Enter','Enter',13);assert.equal(await evaluate(`${e}.getSource()`),'  answer = 42\n','Read-only also rejects Enter');
+ await evaluate(`${e}.setAvailability(false,false);${e}.replaceSource(${JSON.stringify(initial)},true)`);await wait("document.getElementById('status').textContent==='Compiled'");
+ report.checks.push('trusted per-line mouse/touch; canonical alias caret; full and selected-source clipboard; pasted-import native undo/redo; read-only at 390/1440px');
+}
diff --git a/ext/demo-site/test/import-folds-probe.mjs b/ext/demo-site/test/import-folds-probe.mjs
@@ -0,0 +1,28 @@
+// Packaged page, real canonical editor and actual selected compiler/runtime.
+import {sourceEditor as editor,input,change,status,el,inspect,pause} from './source-probe-helpers.mjs';
+const assert=(ok,message)=>{if(!ok)throw Error(message);};
+export async function run(_control,backend='haskell-wasm'){
+ await status('Ready');if(el('runtime-backend').value!==backend){change('runtime-backend',backend);await status('Ready');}
+ const catalog=await(await fetch(new URL('../reference/libraries.json',document.querySelector('script[type=module][src]').src))).json();
+ const releases=catalog.releases;
+ const hash=name=>releases.find(row=>row.name==='tricu-lib-'+name&&row.version==='0.3.0').manifest;
+ const math=hash('native-math'),base=hash('base');
+ const source=`-- λ🙂 canonical offsets\n!import ${math} as N\n!import ${base} as B\n!import ${math} as P\n!export answer\nanswer = N.add 40 2`;
+ document.querySelector('[data-compiler-example=identity]').click();input('source-editor',source);await status('Compiled');
+ const widgets=()=>[...editor.dom.querySelectorAll('.import-hash')],full=()=>editor.dom.querySelectorAll('.import-hash-full').length;
+ assert(widgets().length===3&&widgets()[0].textContent===math.slice(0,3)+'...'+math.slice(-3),'Exact per-hash abbreviation');
+ assert(editor.getSource()===source,'Compilation sees canonical source');
+ let edits=0;const unsubscribe=editor.onChange(()=>edits++);
+ widgets()[0].click();assert(widgets()[0].textContent===math&&widgets()[1].textContent.includes('...'),'Independent expansion');
+ widgets()[0].click();assert(widgets()[0].textContent.includes('...'),'Independent collapse');
+ editor.select(source.indexOf(' as N')+4);assert(full()===1&&widgets().length===2,'Only edited line reveals');
+ editor.select(source.indexOf('!import'),source.indexOf('!import '+math+' as P'));assert(full()===2&&widgets().length===1,'Only selected lines reveal');
+ editor.select(source.length);await pause(0);assert(widgets().length===3&&edits===0,'Presentation/selection preserves source and revision');
+ editor.edit(0,0,`!import ${math} as Q\n`);editor.select(editor.getSource().length);
+ assert(widgets().length===4,'New import receives decoration');assert(editor.undo(),'Insertion undo');assert(editor.getSource()===source,'One undo restores entire canonical document');
+ assert(editor.redo()&&widgets().length===4,'Redo preserves dynamic folding');assert(editor.undo()&&editor.getSource()===source,'Undo remains complete');
+ await status('Compiled');assert(await inspect('answer','number')==='42','Actual compiler/runtime accepts full-hash imports');
+ document.querySelector('[aria-label="Close definition inspection"]').click();
+ editor.select(source.length);editor.view.contentDOM.blur();await pause(0);unsubscribe();
+ return {checks:['per-line import hash folding; independent controls; selected ranges; immutable canonical source/revisions; dynamic import undo/redo; actual compiler/runtime'],source,math};
+}
diff --git a/ext/demo-site/test/import-folds.test.mjs b/ext/demo-site/test/import-folds.test.mjs
@@ -0,0 +1,28 @@
+import test from 'node:test';import assert from 'node:assert/strict';
+import {EditorState,EditorSelection,EditorView} from '../dist/codemirror.js';
+import {importSites,selectedImportLines,importFolds,importFocus} from '../dist/import-folds.js';
+const hash='0123456789abcdef'.repeat(4),other='abcdef0123456789'.repeat(4);
+test('import projection recognizes only real, complete, line-head import hashes',()=>{
+ const source=`-- !import ${hash}\ntext = "!import ${hash}"\n|- !import ${hash} -|\nx = !import ${hash}\n!import ${hash.slice(1)} as short\n!import ${hash.toUpperCase()} as upper\n!import ${hash}x as extra\n!import ${hash} as A\n  !import\t${other} as B`;
+ const sites=importSites(EditorState.create({doc:source}));
+ assert.equal(sites.length,2);assert.deepEqual(sites.map(site=>site.hash),[hash,other]);
+ for(const site of sites)assert.equal(source.slice(site.from,site.to),site.hash);
+});
+test('selection exposes only affected import lines, including exclusive end boundaries',()=>{
+ const doc=`-- λ🙂\n!import ${hash} as A\n!import ${other} as B\nanswer = 42`;
+ let state=EditorState.create({doc});
+ assert.deepEqual([...selectedImportLines(state,false)],[]);
+ state=state.update({selection:EditorSelection.single(doc.indexOf(' as A')+4)}).state;
+ assert.deepEqual([...selectedImportLines(state,true)],[2]);
+ state=state.update({selection:EditorSelection.single(state.doc.line(2).from,state.doc.line(4).from)}).state;
+ assert.deepEqual([...selectedImportLines(state,false)],[2,3]);
+});
+test('projection transactions preserve canonical source and character-level ranges',()=>{
+ const doc=`!import ${hash} as A\n!import ${other} as B\nanswer = 42`;
+ let state=EditorState.create({doc,extensions:[importFolds]});
+ assert.equal(state.field(importFolds).decorations.size,2);
+ state=state.update({selection:EditorSelection.single(state.doc.line(3).from),effects:importFocus.of(true)}).state;
+ assert.equal(state.doc.toString(),doc);assert.deepEqual(state.facet(EditorView.atomicRanges),[]);
+ state=state.update({changes:{from:0,insert:`!import ${hash} as C\n`}}).state;
+ assert.equal(state.field(importFolds).sites.length,3);assert.equal(state.doc.toString(),`!import ${hash} as C\n`+doc);
+});
diff --git a/ext/demo-site/test/import-picker-probe.mjs b/ext/demo-site/test/import-picker-probe.mjs
@@ -1,7 +1,7 @@
 import {evaluateSource,inspect} from './source-probe-helpers.mjs';
 const assert=(ok,message)=>{if(!ok)throw Error(message);};
 const el=id=>document.getElementById(id),delay=ms=>new Promise(r=>setTimeout(r,ms));
-const input=(id,value)=>{el(id).value=value;el(id).dispatchEvent(new Event('input'));};
+const input=(id,value)=>{if(id==='source-editor'){globalThis.__sourceEditor.replaceSource(value,true);return;}el(id).value=value;el(id).dispatchEvent(new Event('input'));};
 const change=(id,value)=>{el(id).value=value;el(id).dispatchEvent(new Event('change'));};
 async function wait(fn,label){for(let i=0;i<4500;i++){if(fn())return;await delay(20);}throw Error('Timeout '+label+' / '+el('status').textContent+' / '+el('import-status').textContent);}
 const status=value=>wait(()=>el('status').textContent===value,value);
@@ -132,7 +132,7 @@ outside = zeros 4097`;
  const select=async()=>{input('import-search','remainder');await wait(()=>el('import-results').querySelector(`[data-manifest="${math.manifest}"]`),'search export');el('import-results').querySelector(`[data-manifest="${math.manifest}"]`).click();input('import-alias','N');};
  await open();await select();
  assert(el('import-title').textContent==='native-math','Search reaches native math');
- assert(el('source-editor').value===original,'Browsing preserves draft');
+ assert(globalThis.__sourceEditor.getSource()===original,'Browsing preserves draft');
  assert(el('import-preview').textContent===`!import ${math.manifest} as N`,'Exact full manifest preview: '+el('import-preview').textContent);
  assert(el('import-version').value==='0.3.0','Newest version initially selected');
  assert(el('import-version').options.length>=2,'History available in details: '+[...el('import-version').options].map(o=>o.value));
@@ -143,26 +143,26 @@ outside = zeros 4097`;
  await wait(()=>!el('insert-import').disabled,'candidate compiled');
  el('insert-import').click();
  assert(!el('import-dialog').open,'Insertion closes dialog');
- assert(el('source-editor').value===`!import ${math.manifest} as N\n`+original,'Insertion preserves all original source');
- assert(el('source-editor').selectionStart===0&&el('source-editor').selectionEnd===(`!import ${math.manifest} as N\n`).length,'Inserted line selected');
+ assert(globalThis.__sourceEditor.getSource()===`!import ${math.manifest} as N\n`+original,'Insertion preserves all original source');
+ assert(globalThis.__sourceEditor.getSelection().from===0&&globalThis.__sourceEditor.getSelection().to===(`!import ${math.manifest} as N\n`).length,'Inserted line selected');
  await status('Compiled');
- // Undo is one native textarea edit; compilation does not replace the editor.
- el('source-editor').focus();assert(document.execCommand('undo'),'Undo available');
- assert(el('source-editor').value===original,'One undo restores exact original source');await status('Compiled');
+ // Import insertion retains one undo transaction across compilation.
+ globalThis.__sourceEditor.focus();assert(globalThis.__sourceEditor.undo(),'Undo available');
+ assert(globalThis.__sourceEditor.getSource()===original,'One undo restores exact original source');await status('Compiled');
  await open();await select();await wait(()=>!el('insert-import').disabled,'reinsert checked');el('insert-import').click();await status('Compiled');
  assert(await evaluateSource('N.add answer 8')==='50','Inserted namespace usable from source');
- const inserted=el('source-editor').value;
+ const inserted=globalThis.__sourceEditor.getSource();
  await open();await select();await wait(()=>!el('insert-import').disabled,'existing import');
  assert(el('import-status').textContent.includes('Already imported as N'),'Existing namespace shown');el('insert-import').click();
- assert(el('source-editor').value===inserted,'Jump does not edit');
+ assert(globalThis.__sourceEditor.getSource()===inserted,'Jump does not edit');
  // Alias conflict is based on the native header; a failed check leaves the editor intact.
  await open();input('import-search','conversions');el('import-results').querySelector('button').click();input('import-alias','N');
  await wait(()=>el('import-status').textContent.includes('already used'),'namespace conflict');assert(el('insert-import').disabled,'Conflict blocks insert');el('import-cancel').click();
- assert(el('source-editor').value===inserted,'Cancellation preserves source');
+ assert(globalThis.__sourceEditor.getSource()===inserted,'Cancellation preserves source');
  input('source-editor','!export answer\nanswer = (');await status('Compilation failed');
  await open();await select();await wait(()=>el('import-status').textContent.includes('copy the import'),'malformed source fallback');assert(el('insert-import').disabled,'Malformed source blocks insertion');el('import-cancel').click();
  input('source-editor',original);await status('Compiled');
- await open();await select();el('import-cancel').click();await delay(400);assert(!el('import-dialog').open,'Check cancelled');assert(el('source-editor').value===original,'Cancellation is an edit-free operation');
+ await open();await select();el('import-cancel').click();await delay(400);assert(!el('import-dialog').open,'Check cancelled');assert(globalThis.__sourceEditor.getSource()===original,'Cancellation is an edit-free operation');
  // Local filenames are text and their validated interfaces are searchable.
  const bytes=await(await fetch('/_arboricx/bundle/hash/'+math.hash)).arrayBuffer();
  const files=new DataTransfer();files.items.add(new File([bytes],'<svg onload=bad>.arboricx'));el('local-module-file').files=files.files;el('local-module-file').dispatchEvent(new Event('change'));
@@ -175,8 +175,8 @@ outside = zeros 4097`;
  assert(definition,'Definition matches have their own results');definition.click();
  assert(el('import-definition').textContent.includes('Definition: remainder'),'Direct definition detail');
  assert(el('try-library').hidden,'Editable source has no expression-only Try action');
- const beforeBrowse=el('source-editor').value;el('import-cancel').click();
- assert(el('source-editor').value===beforeBrowse,'Definition browsing preserves authored source without generating experiments');
+ const beforeBrowse=globalThis.__sourceEditor.getSource();el('import-cancel').click();
+ assert(globalThis.__sourceEditor.getSource()===beforeBrowse,'Definition browsing preserves authored source without generating experiments');
  // Source-free library exploration is available and never inserts into a hidden editor.
  change('program-picker','hash');input('bundle-hash',math.hash);el('program-hash').dispatchEvent(new Event('submit',{cancelable:true}));await status('Ready');
  assert(el('source-editor').hidden&&!el('add-import').hidden,'Explorer available without source');
diff --git a/ext/demo-site/test/inline-io-probe.mjs b/ext/demo-site/test/inline-io-probe.mjs
@@ -1,6 +1,7 @@
+import './source-probe-helpers.mjs';
 const assert=(condition,message)=>{if(!condition)throw Error(message);};
 const el=id=>document.getElementById(id),pause=ms=>new Promise(r=>setTimeout(r,ms));
-const input=(id,value)=>{el(id).value=value;el(id).dispatchEvent(new Event('input'));};
+const input=(id,value)=>{if(id==='source-editor'){globalThis.__sourceEditor.replaceSource(value,true);return;}el(id).value=value;el(id).dispatchEvent(new Event('input'));};
 const change=(id,value)=>{el(id).value=value;el(id).dispatchEvent(new Event('change'));};
 async function wait(check,label){for(let i=0;i<3600;i++){if(check())return;await pause(25);}throw Error('Timeout '+label+' / '+el('status').textContent+' / '+el('operation-diagnostic').textContent);}
 const status=text=>wait(()=>el('status').textContent===text,text);
@@ -51,7 +52,7 @@ export async function run(control,backend='haskell-wasm'){
  el('run-io').click();await status('Finished');assert(el('terminal').textContent==='Explicit output','Rerun clears old terminal');button('write').click();
  await open('io');el('io-return-format').value='string';el('step-mode').checked=true;el('run-io').click();await status('Paused before action');
  el('next').click();await status('Waiting for input');
- assert(!button('io').hidden&&button('io').disabled&&button('io').getAttribute('aria-expanded')==='true'&&getComputedStyle(button('io')).pointerEvents==='none','Active IO name stays highlighted but cannot start another observation');
+ assert(!button('io').hidden&&button('io').getAttribute('aria-disabled')==='true'&&button('io').getAttribute('aria-expanded')==='true'&&getComputedStyle(button('io')).pointerEvents==='none','Active IO name stays highlighted but cannot start another observation');
  input('line-input','a'.repeat(257));el('input-form').requestSubmit();assert(!el('input-form').hidden,'Invalid input remains retryable');
  input('line-input','λ雪🙂');el('input-form').requestSubmit();await status('Finished');assert(view().textContent==='λ雪🙂','Returned IO value uses selected interpretation');
  el('step-mode').checked=false;el('run-io').click();await status('Waiting for input');el('stop-io').click();
diff --git a/ext/demo-site/test/live-ux-probe.mjs b/ext/demo-site/test/live-ux-probe.mjs
@@ -10,10 +10,10 @@ export async function run(control,backend='haskell-wasm'){
   set onmessage(handler){super.onmessage=event=>{if(hold&&['compiled','error'].includes(event.data.type))held.push(()=>handler(event));else handler(event);};}
  };
  try{
-  const original=el('source-editor').value;
+  const original=globalThis.__sourceEditor.getSource();
   input('source-editor',original.replace('first 42 7','first 43 7'));
   assert(card().querySelector('select').disabled&&result()==='','Edits invalidate old inline output immediately');
-  await status('Compiling');assert(!el('source-editor').disabled,'Editing continues during compilation');
+  await status('Compiling');assert(!globalThis.__sourceEditor.isDisabled,'Editing continues during compilation');
   input('source-editor',original.replace('first 42 7','first 44 7'));input('source-editor',original.replace('first 42 7','first 45 7'));
   await wait(()=>held.length>0,'held compilation');assert(submitted.length===1,'Keystrokes do not restart current compile');
   hold=false;held.shift()();await status('Compiled');assert(submitted.length===2&&submitted[1].includes('first 45 7'),'Only newest queued revision compiles');
@@ -31,7 +31,7 @@ export async function run(control,backend='haskell-wasm'){
   input('source-editor','answer = 50');change('program-picker','demo:language-reference');await status('Ready');await pause(900);assert(el('status').textContent==='Ready','Package change cancels queued compilation');
   document.querySelector('[data-compiler-example=input]').click();await status('Compiled');assert(el('input-form').hidden&&el('terminal').textContent==='','Compilation never runs IO');
   await inspect('io');assert(el('input-form').hidden,'Recognition never runs IO');el('io-return-format').value='string';el('run-io').click();await status('Waiting for input');
-  assert(el('source-editor').disabled&&el('reset').disabled,'Active IO cannot be replaced by background edits or Clear');input('line-input','hello λ🙂');el('input-form').requestSubmit();await status('Finished');assert(result()==='hello λ🙂','Inline IO return');
+  assert(globalThis.__sourceEditor.isDisabled&&el('reset').disabled,'Active IO cannot be replaced by background edits or Clear');input('line-input','hello λ🙂');el('input-form').requestSubmit();await status('Finished');assert(result()==='hello λ🙂','Inline IO return');
   input('source-editor','id x = x\nanswer = id 51\nbomb = (x : x x) (x : x x)');await status('Compiled');assert(await inspect('answer','number')==='51','Unused divergent binding is not forced');
   document.querySelector('[aria-label="Inspect compiled definition bomb"]').click();await wait(()=>el('status').textContent==='Inspecting bomb','divergent observation');await pause(150);el('stop').click();await status('Stopped');
  }finally{globalThis.Worker=NativeWorker;}
diff --git a/ext/demo-site/test/local-module-probe.mjs b/ext/demo-site/test/local-module-probe.mjs
@@ -5,7 +5,7 @@ async function rejects(fn,pattern){try{await fn();}catch(e){assert(pattern.test(
 const el=id=>document.getElementById(id),delay=ms=>new Promise(r=>setTimeout(r,ms));
 async function wait(fn){for(let i=0;i<4500;i++){if(fn())return;await delay(20);}throw Error('Timed out: '+el('status').textContent+' / '+el('compiled-module-status').textContent);}
 const status=s=>wait(()=>el('status').textContent===s);
-const input=(id,value)=>{el(id).value=value;el(id).dispatchEvent(new Event('input'));};
+const input=(id,value)=>{if(id==='source-editor'){globalThis.__sourceEditor.replaceSource(value,true);return;}el(id).value=value;el(id).dispatchEvent(new Event('input'));};
 const change=(id,value)=>{el(id).value=value;el(id).dispatchEvent(new Event('change'));};
 export async function run(control,backend){
  const base=new URL('../',document.querySelector('script[type=module][src]').src);
diff --git a/ext/demo-site/test/module-probe.mjs b/ext/demo-site/test/module-probe.mjs
@@ -6,7 +6,7 @@ const equal=(actual,expected,label)=>assert(JSON.stringify(actual)===JSON.string
 async function rejects(fn,pattern){try{await fn();}catch(e){assert(pattern.test(e.message),'Wrong rejection: '+e.message);return;}throw Error('Expected '+pattern);}
 const el=id=>document.getElementById(id),delay=ms=>new Promise(r=>setTimeout(r,ms));
 async function status(value){for(let i=0;i<4500;i++){if(el('status').textContent===value)return;await delay(20);}throw Error('Timed out '+value+': '+el('status').textContent+' '+el('compile-diagnostic').textContent);}
-const input=(id,value)=>{el(id).value=value;el(id).dispatchEvent(new Event('input'));};
+const input=(id,value)=>{if(id==='source-editor'){globalThis.__sourceEditor.replaceSource(value,true);return;}el(id).value=value;el(id).dispatchEvent(new Event('input'));};
 const change=(id,value)=>{el(id).value=value;el(id).dispatchEvent(new Event('change'));};
 export async function run(control,backend='haskell-wasm'){
  const base=new URL('../',document.querySelector('script[type=module][src]').src);
@@ -116,14 +116,14 @@ export async function run(control,backend='haskell-wasm'){
  // Exercise the actual editable page, including Worker termination and rebuilding.
  await status('Ready');change('runtime-backend',backend);await status('Ready');
  document.querySelector('[data-compiler-example=module]').click();await status('Compiled');
- assert(el('source-editor').value.includes(math.manifest),'Module example uses an indexed manifest, not a bundle digest');
+ assert(globalThis.__sourceEditor.getSource().includes(math.manifest),'Module example uses an indexed manifest, not a bundle digest');
  equal(await inspect('answer','number'),'42','Module scratch example');
  input('source-editor',source);el('compile').click();await status('Compiled');
  assert(document.querySelector('[aria-label="Inspect compiled definition private"]'),'Private scope remains inspectable');
  equal(await evaluateSource('N.add answer private'),'141','Actual page imported application in source');
  input('source-editor',`!import ${math.manifest} as N\n!export answer\nloop x = loop x\nanswer = N.add 40 2`);
  el('compile').click();await status('Compiled');
- input('source-editor',el('source-editor').value+'\nbomb = loop t');await status('Compiled');document.querySelector('[aria-label="Inspect compiled definition bomb"]').click();await delay(100);el('stop').click();await status('Stopped');
+ input('source-editor',globalThis.__sourceEditor.getSource()+'\nbomb = loop t');await status('Compiled');document.querySelector('[aria-label="Inspect compiled definition bomb"]').click();await delay(100);el('stop').click();await status('Stopped');
  assert(!el('compile').disabled,'Stop discards imported heap');
  el('compile').click();await status('Compiled');equal(await evaluateSource('N.add answer 1'),'43','Stop/recompile reconstructs verified imports');
  // Edit the actual parser/lexer examples, not a scratch copy; verify changed
@@ -134,14 +134,14 @@ export async function run(control,backend='haskell-wasm'){
   ['lexer','N.inRange character 97 122','N.inRange character 65 90','scanWord "HELLO,world"','HELLO',''],
  ]){
   change('program-picker','demo:'+id);await status('Ready');
-  assert(!el('source-editor').hidden&&!el('source-editor').readOnly,'Editable '+id);
-  const source=el('source-editor').value;assert(source.includes(before),'Known predicate');
+  assert(!el('source-editor').hidden&&!globalThis.__sourceEditor.isReadOnly,'Editable '+id);
+  const source=globalThis.__sourceEditor.getSource();assert(source.includes(before),'Known predicate');
   input('source-editor',source.replace(before,after));el('compile').click();await status('Compiled');
   const expressionSource=`let
   firstValue [[_ _ value] | _] = value
   firstValue _ = ""
   in firstValue (${expression})`;equal(await evaluateSource(expressionSource,'string'),want,'Edited '+id+' result');
-  el('restore-source').click();await status('Ready');equal(el('source-editor').value,source,'Restore '+id);
+  el('restore-source').click();await status('Ready');equal(globalThis.__sourceEditor.getSource(),source,'Restore '+id);
   equal(await evaluateSource(expressionSource,'string'),original,'Restored '+id+' behavior');
  }
  return {userAgent:navigator.userAgent,checks:['all sixteen editable demos match native goldens; parser/lexer edit and restore; native headers; qualified/open imports; full reexports; retained private/import scope; collision/diagnostic controls; transport and manifest faults; no capabilities; repeated replacement/GC; actual page Stop/recompile']};
diff --git a/ext/demo-site/test/probe-api.mjs b/ext/demo-site/test/probe-api.mjs
@@ -7,3 +7,5 @@ export * as bundle from './bundle.js';
 export * as graph from './graph.js';
 export * as codecs from './codecs.js';
 export * as literalInput from './literal-input.js';
+
+export { editorFor } from './source-editor.js';
diff --git a/ext/demo-site/test/site.test.mjs b/ext/demo-site/test/site.test.mjs
@@ -20,8 +20,8 @@ test('editor preserves authoring, IO, package and immutable download controls',a
  for(const id of ['source-editor','compile','stop','restore-source','download-bundle','package-version','program-hash','share','package-definition-search'])assert.ok(html.includes(`id="${id}"`),id);
  assert.match(html,/Edits compile after a pause/);assert.match(html,/Stored definitions can be inspected without source/);
  assert.doesNotMatch(html,/id="edit-source"|compile-consent|slow-compilation|uncapped|execution-limits/);
- const app=await read('src/app.ts');assert.match(app,/sourceEditor.classList.toggle\('modified', modified\)/);
- assert.match(app,/sourceEditor.value !== compiledSource/);
+ const app=await read('src/app.ts');assert.match(app,/sourceEditor.dom.classList.toggle\('modified', modified\)/);
+ assert.match(app,/sourceEditor.getSource\(\) !== compiledSource/);
  assert.match(app,/data.hash !== hash/);
  assert.match(app,/r\.name === name && r\.version === versionPicker\.value/);
 });
diff --git a/ext/demo-site/test/source-probe-helpers.mjs b/ext/demo-site/test/source-probe-helpers.mjs
@@ -1,6 +1,9 @@
-// Real source edits and definition inspection; never emulate retired DOM controls.
+// Source edits and definition inspection through the mounted editor.
 export const el=id=>document.getElementById(id);
-export const input=(id,value)=>{el(id).value=value;el(id).dispatchEvent(new Event('input'));};
+const {editorFor}=await import(new URL('./probe-api.js',document.querySelector('script[type=module][src]').src));
+export const sourceEditor=editorFor(el('source-editor'));
+globalThis.__sourceEditor=sourceEditor;
+export const input=(id,value)=>{if(id==='source-editor'){sourceEditor.replaceSource(value,true);return;}el(id).value=value;el(id).dispatchEvent(new Event('input'));};
 export const change=(id,value)=>{el(id).value=value;el(id).dispatchEvent(new Event('change'));};
 export const pause=ms=>new Promise(r=>setTimeout(r,ms));
 export async function wait(check,label='page state'){
@@ -14,8 +17,9 @@ export const description=()=>card().querySelector('[role=status]').textContent;
 export async function inspect(name,format='auto'){
  const title=card().querySelector('.definition-card-controls strong');
  if(card().hidden||title.textContent!==name||description().startsWith('Runtime stopped.')){
-  const button=document.querySelector(`[aria-label="Inspect compiled definition ${name}"]`)
+  let button=document.querySelector(`[aria-label="Inspect compiled definition ${name}"]`)
    ??[...el('package-definition-list').querySelectorAll('button')].find(button=>button.textContent===name);
+  if(!button&&!sourceEditor.dom.hidden&&sourceEditor.revealDefinition(name)){await wait(()=>document.querySelector(`[aria-label="Inspect compiled definition ${name}"]`),'visible definition '+name);button=document.querySelector(`[aria-label="Inspect compiled definition ${name}"]`);}
   if(!button)throw Error('Missing real definition '+name);button.click();await pause(0);
  }
  await wait(()=>!card().hidden&&!card().querySelector('select').disabled,'inspect '+name);
@@ -28,7 +32,7 @@ export async function evaluateSource(expression,format='number'){
   ??[...el('package-definition-list').querySelectorAll('button')].find(button=>button.textContent===expression));
  if(/^[A-Za-z_][\w?]*$/.test(expression)&&direct)return inspect(expression,format);
  if(el('source-editor').hidden)throw Error('Test must import source-free functions explicitly, not synthesize an evaluator');
- const source=el('source-editor').value.replace(/\n-- browser probe binding\nprobeResult =[\s\S]*$/,'');
+ const source=sourceEditor.getSource().replace(/\n-- browser probe binding\nprobeResult =[\s\S]*$/,'');
  input('source-editor',source+'\n-- browser probe binding\nprobeResult = (\n'+expression.split('\n').map(line=>'  '+line).join('\n')+'\n)');
  await status('Compiled');return inspect('probeResult',format);
 }
diff --git a/ext/demo-site/test/syntax-probe.mjs b/ext/demo-site/test/syntax-probe.mjs
@@ -1,64 +1,31 @@
-// Browser-only presentation checks: no evaluator/compiler substitution.
+// CodeMirror document, selection, highlighting and viewport checks.
+import {sourceEditor as editor,el,wait,status,pause} from './source-probe-helpers.mjs';
 const assert=(ok,message)=>{if(!ok)throw Error(message);};
 export async function syntaxProbe(){
- const source=document.getElementById('source-editor'), input=source;
- for(let i=0;input.disabled;i++){if(i>3600)throw Error('Source not editable for syntax checks');await new Promise(r=>setTimeout(r,25));}
- const wrapper=input.closest('.syntax-editor'), mirror=wrapper.querySelector('pre');
- assert(source.closest('.syntax-editor').querySelector('.syntax-definition'),'Loaded source declarations are highlighted');
- const sourceMirror=source.closest('.syntax-editor').querySelector('pre');
- await new Promise(r=>requestAnimationFrame(()=>requestAnimationFrame(r)));
- assert(Math.abs(sourceMirror.scrollHeight-source.scrollHeight)<=2,'Source mirror wrapping matches native editor: '+JSON.stringify({viewport:innerWidth,input:source.scrollHeight,mirror:sourceMirror.scrollHeight,width:source.clientWidth,mirrorWidth:sourceMirror.style.width,lineHeight:getComputedStyle(source).lineHeight}));
- // Real geometry catches inherited global button sizing and glyph/line-box
- // differences. The IDE harness runs this at 320, 390 and 1440 pixels.
- const checkTargets=()=>{
-  const definitions=[...sourceMirror.querySelectorAll('.syntax-definition')];
-  let visible=0;const controls=[];
-  for(const button of source.closest('.syntax-editor').querySelectorAll('.definition-targets button')){
-   if(button.hidden||button.disabled)continue;
-   const name=button.getAttribute('aria-label').replace('Inspect compiled definition ','');
-   const texts=[...definitions.find(span=>span.textContent===name)?.getClientRects()??[]];
-   const control=button.getBoundingClientRect();
-   const text=texts.find(text=>Math.abs(text.left-control.left)<1&&Math.abs(text.width-control.width)<1);
-   assert(text,'Name target has declaration text: '+name);
-   controls.push(control);
-   assert(Math.abs(control.width-text.width)<=1,'Name target has precisely the identifier width');
-   assert(control.height<=parseFloat(getComputedStyle(source).lineHeight)-2,'Definition control leaves space between adjacent lines');
-   assert(Math.abs(control.top+control.height/2-text.top-text.height/2)<=1,'Definition control centered on '+name+' at '+innerWidth+'px: '+JSON.stringify({controlTop:control.top,controlHeight:control.height,textTop:text.top,textHeight:text.height}));
-   visible++;
-  }
-  controls.sort((a,b)=>a.top-b.top);
-  for(let i=1;i<controls.length;i++)assert(controls[i].top>=controls[i-1].bottom+1,'Sequential name targets do not overlap');
-  assert(visible>0,'Visible definition controls tested');
- };
- const oldScroll=source.scrollTop;
- const firstDefinition=sourceMirror.querySelector('.syntax-definition').getClientRects()[0];
- source.scrollTop=Math.max(0,oldScroll+firstDefinition.top-source.getBoundingClientRect().top-48);source.dispatchEvent(new Event('scroll'));
- checkTargets();
- source.scrollTop=Math.min(source.scrollTop+96,source.scrollHeight-source.clientHeight);source.dispatchEvent(new Event('scroll'));
- checkTargets();
- source.scrollTop=oldScroll;source.dispatchEvent(new Event('scroll'));
- assert(document.querySelector('#source .syntax-definition'),'Read-only source gets the same tokens');
- assert(wrapper.querySelector('[aria-hidden=true]')&&input.tagName==='TEXTAREA','Decorative mirror leaves native accessible textarea intact');
- const saved=input.value;
- const set=value=>{input.value=value;input.dispatchEvent(new Event('input'));};
- const caret=position=>{input.focus();input.setSelectionRange(position,position);input.dispatchEvent(new Event('select'));};
+ for(let i=0;editor.isDisabled;i++){assert(i<3600,'Source editable');await pause(25);}
+ const initiallyPublished=el('status').textContent==='Ready';
+ const dom=editor.dom,saved=editor.getSource(),frame=()=>new Promise(r=>requestAnimationFrame(()=>requestAnimationFrame(r)));
+ assert(dom.querySelector('.syntax-definition'),'Loaded declarations highlighted');
+ assert(dom.querySelector('[contenteditable=true][aria-label]')&&!dom.querySelector('textarea,.syntax-viewport'),'Single accessible editing surface');
+ assert(document.querySelector('#source .syntax-definition'),'Read-only source shares tokens');
+ const set=value=>editor.replaceSource(value,true),caret=position=>editor.select(position);
  set('let named x = [x (t)] in named "λ🙂["');
- assert(mirror.querySelector('.syntax-definition').textContent==='named','Local declaration color');
- assert(mirror.textContent===input.value,'Mirror preserves all source bytes');
- assert(getComputedStyle(mirror.querySelector('.syntax-definition')).color!==getComputedStyle(mirror.querySelector('.syntax-name')).color,'Definition names have a dedicated color');
- caret(input.value.indexOf('['));assert(mirror.querySelectorAll('.bracket-match').length===2,'Caret highlights bracket pair');
- caret(input.value.lastIndexOf('['));assert(!mirror.querySelector('.bracket-match'),'String brackets are ignored');
- input.setSelectionRange(0,4);input.dispatchEvent(new Event('select'));assert(!mirror.querySelector('.bracket-match'),'Range selections have no caret match');
- set('(t');caret(0);assert(mirror.querySelector('.bracket-unmatched'),'Unclosed delimiter marked without compiler interaction');
- set('<img src=x onerror="throw 1">');assert(!mirror.querySelector('img')&&mirror.textContent===input.value,'Source cannot become HTML');
- input.dispatchEvent(new CompositionEvent('compositionstart'));
- assert(wrapper.classList.contains('composing')&&getComputedStyle(wrapper.querySelector('.syntax-viewport')).visibility==='hidden','IME uses visible native text, not a duplicate mirror');
- set('"λ🙂"');input.dispatchEvent(new CompositionEvent('compositionend'));assert(!wrapper.classList.contains('composing'),'IME restores highlighting');
- set(Array(80).fill('"λ🙂" t (t t) '+ 'longIdentifier '.repeat(12)).join('\n')+'\n');
- await new Promise(r=>requestAnimationFrame(()=>requestAnimationFrame(r)));
- assert(Math.abs(mirror.scrollHeight-input.scrollHeight)<=2,'Wrapping and trailing-line heights match native textarea');
- input.scrollTop=300;input.dispatchEvent(new Event('scroll'));
- assert(mirror.style.transform.includes('-300px'),'Scrolling keeps decoration aligned');
- input.blur();set(saved);input.scrollTop=0;input.dispatchEvent(new Event('scroll'));
- for(let i=0;input.disabled;i++){if(i>3600)throw Error('Source restore did not finish');await new Promise(r=>setTimeout(r,25));}
+ assert(dom.querySelector('.syntax-definition').textContent==='named','Local declaration color');
+ assert(getComputedStyle(dom.querySelector('.syntax-definition')).color!==getComputedStyle(dom.querySelector('.syntax-name')).color,'Definition color');
+ caret(editor.getSource().indexOf('['));assert(dom.querySelectorAll('.bracket-match').length===2,'Bracket pair');
+ caret(editor.getSource().lastIndexOf('['));assert(!dom.querySelector('.bracket-match'),'String brackets ignored');
+ editor.select(0,4);assert(!dom.querySelector('.bracket-match'),'Range has no caret match');
+ set('(t');caret(0);assert(dom.querySelector('.bracket-unmatched'),'Unclosed delimiter');
+ set('<img src=x onerror="throw 1">');assert(!dom.querySelector('img')&&editor.getSource()==='<img src=x onerror="throw 1">','Source markup remains literal text');
+ dom.dispatchEvent(new CompositionEvent('compositionstart'));
+ assert(dom.classList.contains('composing'),'Composition lifecycle observed');
+ set('"λ🙂"');dom.dispatchEvent(new CompositionEvent('compositionend'));assert(!dom.classList.contains('composing'),'Composition lifecycle ends');
+ const large=Array.from({length:1000},(_,i)=>`x${i} = ${i}`).join('\n')+'\n';set(large);await frame();
+ assert(editor.getSource()===large&&dom.querySelectorAll('.cm-line').length<1000,'Virtualization preserves complete document and trailing newline');
+ editor.select(large.length);await frame();assert(editor.getSelection().to===large.length,'Selection uses canonical UTF-16 offsets beyond viewport');
+ set(saved);editor.view.contentDOM.blur();editor.view.scrollDOM.scrollTop=0;
+ await pause(0);await wait(()=>['Compiled','Ready'].includes(el('status').textContent)&&!editor.isDisabled,'source restoration');
+ // A slow engine can finish a compilation during the rendering stress check.
+ // Restore the original published session after that compilation completes.
+ if(initiallyPublished&&el('status').textContent==='Compiled'){el('restore-source').click();await status('Ready');}
 }
diff --git a/flake.nix b/flake.nix
@@ -168,13 +168,15 @@
           '';
         };
 
+        siteJavaScript = import ./ext/demo-site/javascript.nix { inherit pkgs; };
+
         tricuWasmTests = pkgs.runCommand "tricu-wasm-tests" {
           nativeBuildInputs = [ pkgs.nodejs pkgs.typescript ];
         } ''
           cp -r ${tricuSource} source
           chmod -R u+w source
           cd source
-          tsc -p ext/demo-site/tsconfig.json
+          cp -r ${siteJavaScript}/. ext/demo-site/dist/
           timeout 120 node ext/wasm/check.mjs ${tricuWasm}/lib/arboricx.wasm
           timeout 120 node ext/wasm/backend-check.mjs ${tricuWasm}/lib/arboricx.wasm
           mkdir -p $out
@@ -188,7 +190,7 @@
           cp -r ${tricuSource} source
           chmod -R u+w source
           cd source
-          tsc -p ext/demo-site/tsconfig.json
+          cp -r ${siteJavaScript}/. ext/demo-site/dist/
           timeout 240 node ext/wasm/browser.mjs ${tricuWasm}/lib/arboricx.wasm chromium $out/report.json
         '';
 
@@ -198,7 +200,7 @@
           cp -r ${tricuSource} source
           chmod -R u+w source
           cd source
-          tsc -p ext/demo-site/tsconfig.json
+          cp -r ${siteJavaScript}/. ext/demo-site/dist/
           mkdir -p $out
           node ext/wasm/compare.mjs ${tricuWasm}/lib/arboricx.wasm $out/report.json
           node ext/wasm/preview-compare.mjs ${tricuWasm}/lib/arboricx.wasm $out/preview-report.json
@@ -458,6 +460,7 @@
             -i${./src} -outputdir "$TMPDIR/objects" ${./test/InspectorOracle.hs} \
             -o $out/bin/inspector-oracle
         '';
+        packages.arboricxSiteJavaScript = siteJavaScript;
         packages.arboricxArtwork = import ./ext/demo-site/artwork.nix { inherit pkgs; };
         packages.arboricxWebkitCheck = import ./ext/demo-site/webkit.nix { inherit pkgs; };
         packages.arboricxSite = siteRelease.arboricxSite;