Added position info to the AST for function declarations, var declarations and expres...

diff --git a/AST.dcl b/AST.dcl
index e0687c3..9132067 100644 (file)
--- a/AST.dcl
+++ b/AST.dcl
@@ -3,10 +3,18 @@ definition module AST
 from Data.Maybe import :: Maybe
 from StdOverloaded import class toString
 
+/*
+ * Type errors can happen in either 
+ * - variable declarations (x :: Int = True)
+ * - function declarations (f :: (Char -> Int) = (+)1)
+ * - Expressions (1 + 'a')
+ * So these are the items that will get position metadata
+ */
+
 :: Pos = {line :: Int, col :: Int}
 
 :: AST = AST [VarDecl] [FunDecl]
-:: VarDecl = VarDecl Type String Expr
+:: VarDecl = VarDecl Pos Type String Expr
 :: Type 
        = TupleType (Type, Type)
        | ListType Type
@@ -16,22 +24,22 @@ from StdOverloaded import class toString
        | CharType
        | VarType
 :: Expr 
-       = VarExpr VarDef
-       | Op2Expr Expr Op2 Expr
-       | Op1Expr Op1 Expr
-       | IntExpr Int
-       | CharExpr Char
-       | BoolExpr Bool
-       | FunExpr FunCall
-       | EmptyListExpr
-       | TupleExpr (Expr, Expr)
+       = VarExpr Pos VarDef
+       | Op2Expr Pos Expr Op2 Expr
+       | Op1Expr Pos Op1 Expr
+       | IntExpr Pos Int
+       | CharExpr Pos Char
+       | BoolExpr Pos Bool
+       | FunExpr Pos FunCall
+       | EmptyListExpr Pos 
+       | TupleExpr Pos (Expr, Expr)
 :: VarDef = VarDef String [FieldSelector]
 :: FieldSelector = FieldHd | FieldTl | FieldFst | FieldSnd
 :: Op1 = UnNegation | UnMinus
 :: Op2 = BiPlus | BiMinus | BiTimes | BiDivide | BiMod | BiEquals | BiLesser |
        BiGreater | BiLesserEq | BiGreaterEq | BiUnEqual | BiAnd | BiOr | BiCons
 
-:: FunDecl = FunDecl String [String] (Maybe FunType) [VarDecl] [Stmt]
+:: FunDecl = FunDecl Pos String [String] (Maybe FunType) [VarDecl] [Stmt]
 :: FunType = FunType [Type] (Maybe Type)
 :: FunCall = FunCall String [Expr]
 :: Stmt 

diff --git a/AST.icl b/AST.icl
index 6023056..fb4c405 100644 (file)
--- a/AST.icl
+++ b/AST.icl
@@ -18,7 +18,7 @@ printersperse :: String [a] -> [String] | print a
 printersperse i j = intercalate [i] (map print j)
 
 instance print FunDecl where
-       print (FunDecl i as t vs ss) =
+       print (FunDecl _ i as t vs ss) =
                ["\n", i, " (":printersperse "," as] ++
                [")"] ++ maybe [] (\tt->[" :: ":print tt]) t ++
                ["{\n\t":printersperse "\n\t" vs] ++
@@ -52,7 +52,7 @@ instance print FunType where
                [if (isEmpty at) "" "->":maybe ["Void"] print rt]
 
 instance print VarDecl where
-       print (VarDecl t i e) = print t ++ [" ":i:"=":print e] ++ [";"]
+       print (VarDecl _ t i e) = print t ++ [" ":i:"=":print e] ++ [";"]
 
 instance print Type where
        print (TupleType (t1, t2)) = ["(":print t1] ++ [",":print t2] ++ [")"]
@@ -79,23 +79,23 @@ instance print FunCall where
        print (FunCall i args) = [i,"(":printersperse "," args] ++ [")"]
 
 instance print Expr where
-       print (VarExpr vd) = print vd
-       print (Op2Expr e1 o e2) = ["(":print e1] ++ [" ",case o of
+       print (VarExpr _ vd) = print vd
+       print (Op2Expr _ e1 o e2) = ["(":print e1] ++ [" ",case o of
                BiPlus = "+"; BiMinus = "-"; BiTimes = "*"; BiDivide = "/"
                BiMod = "%"; BiEquals = "="; BiLesser = "<"; BiGreater = ">"
                BiLesserEq = "<="; BiGreaterEq = ">="; BiUnEqual = "!=";
                BiAnd = "&&"; BiOr = "||"; BiCons = ":"
                ," ":print e2] ++ [")"]
-       print (Op1Expr o e) = ["(",case o of
+       print (Op1Expr _ o e) = ["(",case o of
                UnNegation = "!"; UnMinus = "-"
                :print e] ++ [")"]
-       print (IntExpr i) = [toString i]
-       print (CharExpr c) = ["\'", case c of
+       print (IntExpr _ i) = [toString i]
+       print (CharExpr _ c) = ["\'", case c of
                '\b' = "\\b"; '\f' = "\\f"; '\n' = "\\n"
                '\r' = "\\r"; '\t' = "\\t"; '\v' = "\\v"
                c = if (c == toChar 7) "\\a" (toString c)
                ,"\'"]
-       print (BoolExpr b) = [toString b]
-       print (FunExpr fc) = print fc
-       print EmptyListExpr = ["[]"]
-       print (TupleExpr (e1, e2)) = ["(":print e1] ++ [",":print e2] ++ [")"]
+       print (BoolExpr _ b) = [toString b]
+       print (FunExpr _ fc) = print fc
+       print (EmptyListExpr _) = ["[]"]
+       print (TupleExpr _ (e1, e2)) = ["(":print e1] ++ [",":print e2] ++ [")"]

diff --git a/parse.icl b/parse.icl
index dfb0708..8c4a25e 100644 (file)
--- a/parse.icl
+++ b/parse.icl
@@ -23,12 +23,13 @@ parser (Left e) = Left e
 parser (Right r) = fst $ runParser parseProgram r
 
 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)
+parseFunDecl = liftM6 FunDecl
+    (peekPos)
+    (parseIdent)
+       (satTok BraceOpenToken *> parseSepList CommaToken parseIdent <* satTok BraceCloseToken)
        (optional parseFunType <* satTok CBraceOpenToken)
        (many parseVarDecl)
        (many parseStmt <* satTok CBraceCloseToken)
@@ -79,7 +80,8 @@ 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)
@@ -111,27 +113,27 @@ 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 (
+               parseOpL ops prev = peekPos >>= \pos-> prev >>= \e1->many (
                                ops >>= \op->prev >>= \e->pure (op, e)
-                       ) >>= \moe->foldM (\e->(\(op,e2)->pure $ Op2Expr e op e2)) e1 moe
+                       ) >>= \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)
@@ -162,12 +164,18 @@ 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 +195,6 @@ 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
\ No newline at end of file