X-Git-Url: https://git.martlubbers.net/?a=blobdiff_plain;f=parse.icl;h=36791241438c6a3c37c0de62d7520ddb34cc6d8c;hb=42f469bb622f254f8008b064bdb720c72daaf2e3;hp=dfb0708372bb665e1ab5b45fa56f36a807bf0890;hpb=80bcdf651a056b8993e042b57b4295550e8566bb;p=cc1516.git

diff --git a/parse.icl b/parse.icl
index dfb0708..3679124 100644
--- a/parse.icl
+++ b/parse.icl
@@ -20,23 +20,27 @@ import AST
 
 parser :: LexerOutput -> ParserOutput
 parser (Left e) = Left e
-parser (Right r) = fst $ runParser parseProgram r
+parser (Right r) = case runParser parseProgram r 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 = liftM2 AST (many parseVarDecl) (some parseFunDecl)
+parseProgram = AST <$> (many parseVarDecl) <*> (some parseFunDecl)
 
 parseFunDecl :: Parser Token FunDecl
-parseFunDecl = liftM5 FunDecl
-	(parseIdent <* satTok BraceOpenToken)
-	(parseSepList CommaToken parseIdent <* satTok BraceCloseToken)
-	(optional parseFunType <* satTok CBraceOpenToken)
-	(many parseVarDecl)
+parseFunDecl = liftM6 FunDecl
+    (peekPos)
+    (parseIdent)
+	(parseBBraces $ parseSepList CommaToken parseIdent)
+	(optional parseFunType)
+	(satTok CBraceOpenToken *> many parseVarDecl)
 	(many parseStmt <* satTok CBraceCloseToken)
 
 parseStmt :: Parser Token Stmt
 parseStmt = parseIfStmt <|> parseWhileStmt <|>
 	parseSColon parseAssStmt <|> parseSColon parseReturnStmt <|>
-	(liftM FunStmt (parseSColon parseFunCall))
+	(FunStmt <$> parseSColon parseFunCall)
 	where
 		parseSColon :: (Parser Token a) -> Parser Token a
 		parseSColon p = p <* satTok SColonToken
@@ -57,14 +61,13 @@ parseStmt = parseIfStmt <|> parseWhileStmt <|>
                 (optional (satTok ElseToken *> (parseBlock<|> parseOneLine))))
 
 		parseWhileStmt :: Parser Token Stmt
-		parseWhileStmt = satTok WhileToken *>
-			(WhileStmt <$> (parseBBraces parseExpr) <*> parseBlock)
+		parseWhileStmt = satTok WhileToken *> (WhileStmt <$> 
+			(parseBBraces parseExpr) <*> (parseBlock <|> parseOneLine))
 
 		parseBlock :: Parser Token [Stmt]
 		parseBlock = parseBCBraces (many parseStmt)
 
 		parseOneLine :: Parser Token [Stmt]
-		//first pure makes singleton list from the statement
 		parseOneLine = pure <$> parseStmt
 
 parseFunType :: Parser Token FunType
@@ -79,7 +82,8 @@ parseFunType = satTok DoubleColonToken *>
 			(Just <$> parseType) <|> pure Nothing
 
 parseVarDecl :: Parser Token VarDecl
-parseVarDecl = liftM3 VarDecl
+parseVarDecl = liftM4 VarDecl
+    peekPos
 	(parseType <|> trans1 VarToken VarType )
 	(parseIdent <* satTok AssignmentToken)
 	(parseExpr <* satTok SColonToken)
@@ -111,30 +115,31 @@ parseExpr = //Operators in order of binding strength
 			trans1 PercentToken BiMod) $ parseBasicExpr
 	where
 		parseOpR :: (Parser Token Op2) (Parser Token Expr) -> Parser Token Expr
-		parseOpR ops prev = prev >>= \e1->optional (
+		parseOpR ops prev = peekPos >>= \pos-> prev >>= \e1->optional (
 				ops >>= \op->parseOpR ops prev >>= \e->pure (op, e)
-			) >>= \moe->pure $ maybe e1 (\(op,e2)->Op2Expr e1 op e2) moe
+			) >>= \moe->pure $ maybe e1 (\(op,e2)->Op2Expr pos e1 op e2) moe
 
 		parseOpL :: (Parser Token Op2) (Parser Token Expr) -> Parser Token Expr
-		parseOpL ops prev = prev >>= \e1->many (
-				ops >>= \op->prev >>= \e->pure (op, e)
-			) >>= \moe->foldM (\e->(\(op,e2)->pure $ Op2Expr e op e2)) e1 moe
+		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
 
 		parseBasicExpr :: Parser Token Expr
-		parseBasicExpr =
-			(TupleExpr <$> (parseTuple parseExpr)) <|>
-			(FunExpr <$> parseFunCall) <|>
+		parseBasicExpr = peekPos >>= \pos ->
+			(TupleExpr pos <$> (parseTuple parseExpr)) <|>
+			(FunExpr pos <$> parseFunCall) <|>
 			parseBBraces parseExpr <|>
-			trans1 EmptyListToken EmptyListExpr <|>
-			trans1 TrueToken (BoolExpr True) <|>
-			trans1 FalseToken (BoolExpr False) <|>
-			trans2 (NumberToken zero) (\(NumberToken i)->IntExpr i) <|>
-			trans2 (CharToken zero) (\(CharToken c)->CharExpr c) <|>
-			(Op1Expr <$> parseOp1 <*> parseExpr) <|>
-			(VarExpr <$> parseVarDef)
+			trans1 EmptyListToken (EmptyListExpr pos) <|>
+			trans1 TrueToken (BoolExpr pos True) <|>
+			trans1 FalseToken (BoolExpr pos False) <|>
+			trans2 (NumberToken zero) (\(NumberToken i)->IntExpr pos i) <|>
+			trans2 (CharToken zero) (\(CharToken c)->CharExpr pos c) <|>
+			(Op1Expr pos <$> parseOp1 <*> parseExpr) <|>
+			(VarExpr pos <$> parseVarDef)
 
 parseFunCall :: Parser Token FunCall
-parseFunCall = FunCall <$> parseIdent <*> (parseBBraces $ parseSepList CommaToken parseExpr)
+parseFunCall = FunCall <$> parseIdent <*> 
+	(parseBBraces $ parseSepList CommaToken parseExpr)
 
 parseVarDef :: Parser Token VarDef
 parseVarDef = liftM2 VarDef
@@ -162,12 +167,18 @@ parseTuple p = satTok BraceOpenToken *>
 	(liftM2 (\a->(\b->(a,b))) (p <* satTok CommaToken) p)
 	<* satTok BraceCloseToken
 
+trans :: TokenValue (TokenValue -> a) -> Parser Token (Pos, a)
+trans t f = (\(pos,token)->(pos, f token)) <$> satTok t
+
 trans2 :: TokenValue (TokenValue -> a) -> Parser Token a
-trans2 t f = (\(_,token)->f token) <$> satTok t
+trans2 t f = snd <$> trans t f
 
 trans1 :: TokenValue a -> Parser Token a
 trans1 t r = trans2 t $ const r
 
+peekPos :: Parser Token Pos
+peekPos = fst <$> peek
+
 derive gPrint TokenValue
 derive gEq TokenValue
 satTok :: TokenValue -> Parser Token Token
@@ -187,3 +198,6 @@ parseSepList sep p =
 
 parseIdent :: Parser Token String
 parseIdent = trans2 (IdentToken "") (\(IdentToken e).toString e)
+
+//liftM only goes to liftM5
+liftM6 f m1 m2 m3 m4 m5 m6 = f <$> m1 <*> m2 <*> m3 <*> m4 <*> m5 <*> m6