X-Git-Url: https://git.martlubbers.net/?a=blobdiff_plain;f=parse.icl;h=46a92e3612f39402a186f34f6f2f5f42e6330cd8;hb=f081c2c5e248331eb6e2f090f4afe818fd8259eb;hp=34ec15b2f9109e6bc0ead07efffac329cee5bee9;hpb=f297ddf3ea579fcafe3111510b385da1ba150a89;p=cc1516.git

diff --git a/parse.icl b/parse.icl
index 34ec15b..46a92e3 100644
--- a/parse.icl
+++ b/parse.icl
@@ -7,9 +7,11 @@ from StdFunc import const, o
 import Data.Either
 import Data.Maybe
 import Data.Functor
+import Data.Tuple
 import Control.Monad
 import Control.Applicative
 import Data.Func
+import StdMisc
 from Data.List import intercalate, replicate, instance Functor []
 from Text import class Text(concat), instance Text String
 import GenPrint
@@ -18,12 +20,14 @@ import yard
 import lex
 import AST
 
-parser :: LexerOutput -> ParserOutput
-parser (Left e) = Left e
-parser (Right r) = fst $ runParser parseProgram r
+parser :: [Token] -> ParserOutput
+parser ts = case runParser parseProgram ts of
+	(Right ast, [(p, t):xs]) = Left $ PositionalError p.line p.col (
+		"Unable to parse from: " +++ printToString t)
+	x = fst x
 
 parseProgram :: Parser Token AST
-parseProgram = AST <$> (many parseVarDecl) <*> (some parseFunDecl)
+parseProgram = AST <$> some parseFunDecl
 
 parseFunDecl :: Parser Token FunDecl
 parseFunDecl = liftM6 FunDecl
@@ -37,7 +41,7 @@ parseFunDecl = liftM6 FunDecl
 parseStmt :: Parser Token Stmt
 parseStmt = parseIfStmt <|> parseWhileStmt <|>
 	parseSColon parseAssStmt <|> parseSColon parseReturnStmt <|>
-	(FunStmt <$> parseSColon parseFunCall)
+	(parseSColon parseFunCall >>= \(ident, args)->pure $ FunStmt ident args)
 	where
 		parseSColon :: (Parser Token a) -> Parser Token a
 		parseSColon p = p <* satTok SColonToken
@@ -65,24 +69,21 @@ parseStmt = parseIfStmt <|> parseWhileStmt <|>
 		parseBlock = parseBCBraces (many parseStmt)
 
 		parseOneLine :: Parser Token [Stmt]
-		//first pure makes singleton list from the statement
 		parseOneLine = pure <$> parseStmt
 
-parseFunType :: Parser Token FunType
-parseFunType = satTok DoubleColonToken *>
-	(parseInOutType <|> ((FunType []) <$> parseVoidOrType))
+parseFunType :: Parser Token Type
+parseFunType = satTok DoubleColonToken *> parseFT
 	where
-		parseInOutType :: Parser Token FunType
-		parseInOutType =  FunType <$> (some parseType <* satTok ArrowToken) <*> parseVoidOrType
-
-		parseVoidOrType :: Parser Token (Maybe Type)
-		parseVoidOrType = (satTok VoidToken *> pure Nothing) <|>
-			(Just <$> parseType) <|> pure Nothing
+        parseFT :: Parser Token Type
+		parseFT = (liftM2 (->>) (parseSF <* satTok ArrowToken) (parseFT)) <|>
+			parseSF
+		parseSF :: Parser Token Type
+		parseSF = parseBBraces parseFT <|> parseType
 
 parseVarDecl :: Parser Token VarDecl
 parseVarDecl = liftM4 VarDecl
     peekPos
-	(parseType <|> trans1 VarToken VarType )
+	((parseType >>= \t->pure $ Just t)<|> trans1 VarToken Nothing)
 	(parseIdent <* satTok AssignmentToken)
 	(parseExpr <* satTok SColonToken)
 
@@ -91,6 +92,7 @@ parseType =
 	trans1 IntTypeToken IntType <|>
 	trans1 CharTypeToken CharType <|>
 	trans1 BoolTypeToken BoolType <|>
+    trans1 VoidToken VoidType <|>
 	(ListType <$> (parseBSqBraces parseType)) <|>
 	(TupleType <$> (parseTuple parseType)) <|>
 	(IdType <$> parseIdent)
@@ -119,13 +121,12 @@ parseExpr = //Operators in order of binding strength
 
 		parseOpL :: (Parser Token Op2) (Parser Token Expr) -> Parser Token Expr
 		parseOpL ops prev = peekPos >>= \pos-> prev >>= \e1->many (
-				ops >>= \op->prev >>= \e->pure (op, e)
-			) >>= \moe->foldM (\e->(\(op,e2)->pure $ Op2Expr pos e op e2)) e1 moe
+				ops >>= \op->prev >>= \e->pure (op, e))
+			>>= \moe->foldM (\e->(\(op,e2)->pure $ Op2Expr pos e op e2)) e1 moe
 
 		parseBasicExpr :: Parser Token Expr
 		parseBasicExpr = peekPos >>= \pos ->
 			(TupleExpr pos <$> (parseTuple parseExpr)) <|>
-			(FunExpr pos <$> parseFunCall) <|>
 			parseBBraces parseExpr <|>
 			trans1 EmptyListToken (EmptyListExpr pos) <|>
 			trans1 TrueToken (BoolExpr pos True) <|>
@@ -133,19 +134,24 @@ parseExpr = //Operators in order of binding strength
 			trans2 (NumberToken zero) (\(NumberToken i)->IntExpr pos i) <|>
 			trans2 (CharToken zero) (\(CharToken c)->CharExpr pos c) <|>
 			(Op1Expr pos <$> parseOp1 <*> parseExpr) <|>
+			(parseFunCall >>= \(ident, args)->parseFieldSelectors >>= \fs->
+				pure $ FunExpr pos ident args fs) <|>
 			(VarExpr pos <$> parseVarDef)
 
-parseFunCall :: Parser Token FunCall
-parseFunCall = FunCall <$> parseIdent <*> (parseBBraces $ parseSepList CommaToken parseExpr)
+parseFunCall :: Parser Token (String, [Expr])
+parseFunCall = liftM2 tuple 
+	parseIdent 
+	(parseBBraces $ parseSepList CommaToken parseExpr)
 
 parseVarDef :: Parser Token VarDef
-parseVarDef = liftM2 VarDef
-	parseIdent
-	(many (satTok DotToken *> (
-		(parseIdent >>= (\i.if (i == "hd") (pure FieldHd) empty)) <|>
-		(parseIdent >>= \i.if (i == "tl") (pure FieldTl) empty) <|>
-		(parseIdent >>= \i.if (i == "fst") (pure FieldFst) empty) <|>
-		(parseIdent >>= \i.if (i == "snd") (pure FieldSnd) empty))))
+parseVarDef = liftM2 VarDef parseIdent parseFieldSelectors
+
+parseFieldSelectors :: Parser Token [FieldSelector]
+parseFieldSelectors = many (satTok DotToken *> (
+	(parseIdent >>= \i.if (i == "hd") (pure FieldHd) empty) <|>
+	(parseIdent >>= \i.if (i == "tl") (pure FieldTl) empty) <|>
+	(parseIdent >>= \i.if (i == "fst") (pure FieldFst) empty) <|>
+	(parseIdent >>= \i.if (i == "snd") (pure FieldSnd) empty)))
 
 parseOp1 :: Parser Token Op1
 parseOp1 = trans1 DashToken UnMinus <|> trans1 ExclamationToken UnNegation
@@ -161,7 +167,7 @@ parseBSqBraces p = satTok SquareOpenToken *> p <* satTok SquareCloseToken
 
 parseTuple :: (Parser Token a) -> Parser Token (a, a)
 parseTuple p = satTok BraceOpenToken *>
-	(liftM2 (\a->(\b->(a,b))) (p <* satTok CommaToken) p)
+	(liftM2 tuple (p <* satTok CommaToken) p)
 	<* satTok BraceCloseToken
 
 trans :: TokenValue (TokenValue -> a) -> Parser Token (Pos, a)