55 lines
1.9 KiB
Markdown
55 lines
1.9 KiB
Markdown
# sapling
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## Introduction
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sapling is a "micro-language" that I'm working on to investigate [Tree Calculus](https://github.com/barry-jay-personal/typed_tree_calculus/blob/main/typed_program_analysis.pdf) .
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It offers a minimal amount of syntax sugar:
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- `t` operator behaving by the rules of Tree Calculus
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- Function ("variable") definitions
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- Lambda abstractions
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- List, Number, and String literals (WIP)
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This is an active experimentation project by [someone who has no idea what they're doing](https://eversole.co).
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## What does it look like?
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```
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false = t
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_ = t
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true = t t
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id = (\a : a)
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triage = (\a b c : t (t a b) c)
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match_bool = (\ot of : triage of (\_ : ot) t)
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and = match_bool id (\_ : false)
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if = (\cond then else : t (t else (t t then)) t cond)
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triage = (\a b c : t (t a b) c)
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test = triage "leaf" (\_ : "stem") (\_ _ : "fork")
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-- The REPL outputs the tree form results by default; they are elided here.
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sapling < test t
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DECODE -: "leaf"
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sapling < test (t t)
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DECODE -: "stem"
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sapling < test (t t t)
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DECODE -: "fork"
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sapling < map (\i : listConcat i " is super cool!") [("He") ("She") ("Everybody")]
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DECODE -: ["He is super cool!", "She is super cool!", "Everybody is super cool!"]
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```
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## How to use
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For now, you can easily build and run this project using Nix:
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1. Clone the repository:
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a. `git clone ssh://git.eversole.co/sapling.git`
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b. `git clone https://git.eversole/sapling.git`
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1. Run the REPL: `nix run`
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## Acknowledgements
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Tree Calculus was discovered by [Barry Jay](https://github.com/barry-jay-personal/blog).
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[treecalcul.us](https://treecalcul.us) is an excellent website with an intuitive playground created by [Johannes Bader](https://johannes-bader.com/) that introduced me to Tree Calculus. If sapling sounds interesting but compiling this repo sounds like a hassle, you should check out his site.
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