Fixes identifier lexing; support REPL file loading

.gitignore

@@ -1,10 +1,7 @@
 bin/
-data/Purr.sqlite
-data/encryptionKey
 /result
 /config.dhall
 /Dockerfile
-/docker-stack.yml
 .stack-work/
 *.swp
 dist*

src/FileEval.hs

@@ -17,3 +17,9 @@ evaluateFile filePath = do
   case Map.lookup "__result" finalEnv of
     Just finalResult -> return finalResult
     Nothing -> error "No result found in final environment"
+
+evaluateFileEnv :: FilePath -> IO Env
+evaluateFileEnv filePath = do
+  contents <- readFile filePath
+  let asts = parseTricu contents
+  pure $ evalTricu library asts

src/Lexer.hs

@@ -17,7 +17,9 @@ keywordT = string "t" *> notFollowedBy alphaNumChar *> pure LKeywordT
 
 identifier :: Lexer LToken
 identifier = do
-  name <- some (letterChar <|> char '_' <|> char '-')
+  first <- letterChar <|> char '_'
+  rest <- many (letterChar <|> char '_' <|> char '-' <|> digitChar)
+  let name = first : rest
   if (name == "t" || name == "__result")
     then fail "Keywords (`t`, `__result`) cannot be used as an identifier"
     else return (LIdentifier name)
@@ -31,9 +33,6 @@ stringLiteral :: Lexer LToken
 stringLiteral = do
   char '"'
   content <- many (noneOf ['"'])
-  if null content
-    then fail "Empty string literals are not allowed"
-    else do
   char '"' --"
   return (LStringLiteral content)
 

src/Main.hs

@@ -38,10 +38,10 @@ evaluateMode = Evaluate
       &= name "o"
   , form = FSL &= typ "FORM" 
       &= help "Optional output form: (fsl|tree|ast|ternary|ascii).\n \
-             \ Defaults to fsl." 
+             \ Defaults to fsl \"Fork Stem Leaf\" form." 
       &= name "t"
   }
-  &= help "Evaluate a file and return the result of the expression in the final line"
+  &= help "Evaluate tricu and return the result of the expression in the final line"
   &= explicit
   &= name "eval"
 

src/REPL.hs

@@ -1,6 +1,7 @@
 module REPL where
 
 import Eval
+import FileEval
 import Lexer
 import Parser
 import Research
@@ -21,6 +22,15 @@ repl env = runInputT defaultSettings (loop env)
       case minput of
         Nothing -> outputStrLn "Goodbye!"
         Just ":_exit" -> outputStrLn "Goodbye!"
+        Just ":_load" -> do
+          path <- getInputLine "File path to load < "
+          case path of
+            Nothing -> do
+              outputStrLn "No input received; stopping import."
+              loop env
+            Just path -> do
+              loadedEnv <- liftIO $ evaluateFileEnv path
+              loop $ Map.union loadedEnv env
         Just "" -> do
           outputStrLn ""
           loop env