update README

[cc1516.git] / src / parse.icl

diff --git a/src/parse.icl b/src/parse.icl
index 349c0e1..acd7d9c 100644 (file)
--- a/src/parse.icl
+++ b/src/parse.icl
@@ -18,14 +18,11 @@ import yard
 import lex
 
 parser :: LexerOutput -> ParserOutput
-parser (Left e) = Left $ toString $ LexError e
-parser (Right r) = case runParser parseProgram r of
-       (Right p, _) = Right p
-       (Left e, _) = Left $ toString e
+parser (Left e) = Left e
+parser (Right r) = fst $ runParser parseProgram r
 
 parseProgram :: Parser Token AST
 parseProgram = liftM2 AST (many parseVarDecl) (some parseFunDecl) 
-       <* satTok EndOfFileToken
 
 parseFunDecl :: Parser Token FunDecl
 parseFunDecl = liftM5 FunDecl
@@ -53,10 +50,11 @@ parseStmt = parseIfStmt <|> parseWhileStmt <|>
 
                parseIfStmt :: Parser Token Stmt
                parseIfStmt = liftM3 IfStmt
-                       (satTok IfToken *> parseBBraces parseExpr)
-                       (parseBlock <|> parseOneLine)
-                       (liftM (fromMaybe []) 
-                               (optional (satTok ElseToken *> (parseBlock<|> parseOneLine))))
+            (satTok IfToken *> parseBBraces parseExpr)
+            (parseBlock <|> parseOneLine)
+            (liftM (fromMaybe []) 
+                (optional (satTok ElseToken *> (parseBlock<|> parseOneLine))))
+
 
                parseWhileStmt :: Parser Token Stmt
                parseWhileStmt = satTok WhileToken *> 
@@ -167,7 +165,7 @@ parseTuple p = satTok BraceOpenToken *>
        <* satTok BraceCloseToken
 
 trans2 :: TokenValue (TokenValue -> a) -> Parser Token a
-trans2 t f = liftM (f o snd) $ satTok t
+trans2 t f = liftM (\{token}->f token) $ satTok t
 
 trans1 :: TokenValue a -> Parser Token a
 trans1 t r = trans2 t $ const r
@@ -175,12 +173,13 @@ trans1 t r = trans2 t $ const r
 derive gPrint TokenValue
 derive gEq TokenValue
 satTok :: TokenValue -> Parser Token Token
-satTok t = top >>= \tok=:(pos, tv) -> if (eq t tok) (return tok) (fail <?> (printToString tv, pos))
+satTok t = top >>= \tok=:{line,column,token} -> if (eq t token) 
+       (return tok) (fail <?> PositionalError line column ("ParseError: Unexpected token: " +++ printToString token))
        where
-               eq (IdentToken _) (_, IdentToken _) = True
-               eq (NumberToken _) (_, NumberToken _) = True
-               eq (CharToken _) (_, CharToken _) = True
-               eq x (_, y) = gEq {|*|} x y
+               eq (IdentToken _)  (IdentToken _) = True
+               eq (NumberToken _) (NumberToken _) = True
+               eq (CharToken _)   (CharToken _) = True
+               eq x y = gEq {|*|} x y
 
 parseSepList :: TokenValue (Parser Token a) -> Parser Token [a]
 parseSepList sep p = 
@@ -188,7 +187,7 @@ parseSepList sep p =
        (liftM pure p) <|> pure empty
 
 parseIdent :: Parser Token String
-parseIdent = trans2 (IdentToken []) (\(IdentToken e).toString e)
+parseIdent = trans2 (IdentToken "") (\(IdentToken e).toString e)
 
 instance toString AST where
        toString (AST v f) = concat (