X-Git-Url: https://git.martlubbers.net/?a=blobdiff_plain;f=parse.icl;h=a79ad2fcfe52aeb7391e7701a1040504e9c4dde3;hb=74b900cf6db033a51e177f7f85d835dae44217e5;hp=46a92e3612f39402a186f34f6f2f5f42e6330cd8;hpb=6758e36a62b15fea8b7505f58b829ff4ff0ba94e;p=cc1516.git

diff --git a/parse.icl b/parse.icl
index 46a92e3..a79ad2f 100644
--- a/parse.icl
+++ b/parse.icl
@@ -1,5 +1,6 @@
 implementation module parse
 
+import GenPrint
 import StdString
 import StdTuple
 import StdList
@@ -14,7 +15,6 @@ import Data.Func
 import StdMisc
 from Data.List import intercalate, replicate, instance Functor []
 from Text import class Text(concat), instance Text String
-import GenPrint
 
 import yard
 import lex
@@ -27,21 +27,34 @@ parser ts = case runParser parseProgram ts of
 	x = fst x
 
 parseProgram :: Parser Token AST
-parseProgram = AST <$> some parseFunDecl
+parseProgram = many parseLetDecl >>= \fds1->
+                some parseFunDecl >>= \fds2->
+                pure $ AST (fds1++fds2)
+
+parseLetDecl :: Parser Token FunDecl
+parseLetDecl = peekPos >>= \p->
+                satTok LetToken >>|
+                parseFunType >>= \mt->
+                parseIdent >>= \f->
+                satTok AssignmentToken >>|
+                parseExpr >>= \e->
+                satTok SColonToken >>|
+                pure (FunDecl p f [] (Just mt) [] [ReturnStmt $ Just e])
 
 parseFunDecl :: Parser Token FunDecl
 parseFunDecl = liftM6 FunDecl
     (peekPos)
     (parseIdent)
 	(parseBBraces $ parseSepList CommaToken parseIdent)
-	(optional parseFunType)
+	(optional (satTok DoubleColonToken *> parseFunType))
 	(satTok CBraceOpenToken *> many parseVarDecl)
 	(many parseStmt <* satTok CBraceCloseToken)
 
 parseStmt :: Parser Token Stmt
 parseStmt = parseIfStmt <|> parseWhileStmt <|>
 	parseSColon parseAssStmt <|> parseSColon parseReturnStmt <|>
-	(parseSColon parseFunCall >>= \(ident, args)->pure $ FunStmt ident args)
+	(parseSColon parseFunCall 
+		>>= \(ident, args, fs)->pure $ FunStmt ident args fs)
 	where
 		parseSColon :: (Parser Token a) -> Parser Token a
 		parseSColon p = p <* satTok SColonToken
@@ -72,7 +85,9 @@ parseStmt = parseIfStmt <|> parseWhileStmt <|>
 		parseOneLine = pure <$> parseStmt
 
 parseFunType :: Parser Token Type
-parseFunType = satTok DoubleColonToken *> parseFT
+parseFunType = parseFT >>= \t -> case t of
+        t1 ->> t2   = pure t
+        simpleT     = pure $ FuncType simpleT
 	where
         parseFT :: Parser Token Type
 		parseFT = (liftM2 (->>) (parseSF <* satTok ArrowToken) (parseFT)) <|>
@@ -98,7 +113,9 @@ parseType =
 	(IdType <$> parseIdent)
 
 parseExpr :: Parser Token Expr
-parseExpr = //Operators in order of binding strength
+parseExpr = parseValueExpr <|> parseLambda
+parseValueExpr :: Parser Token Expr
+parseValueExpr = //Operators in order of binding strength
 	parseOpR (trans1 ColonToken BiCons) $
 	parseOpR (trans1 PipesToken BiOr) $
 	parseOpR (trans1 AmpersandsToken BiAnd) $
@@ -126,6 +143,7 @@ parseExpr = //Operators in order of binding strength
 
 		parseBasicExpr :: Parser Token Expr
 		parseBasicExpr = peekPos >>= \pos ->
+			(trans2 (StringToken []) (\(StringToken cs)->makeStrExpr pos cs)) <|>
 			(TupleExpr pos <$> (parseTuple parseExpr)) <|>
 			parseBBraces parseExpr <|>
 			trans1 EmptyListToken (EmptyListExpr pos) <|>
@@ -134,24 +152,36 @@ 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->
+			(parseFunCall >>= \(ident, args, fs)->
 				pure $ FunExpr pos ident args fs) <|>
 			(VarExpr pos <$> parseVarDef)
 
-parseFunCall :: Parser Token (String, [Expr])
-parseFunCall = liftM2 tuple 
+parseLambda :: Parser Token Expr
+parseLambda = LambdaExpr <$> peekPos 
+                        <*> (satTok BackslashToken *> some parseIdent)
+                        <*> (satTok ArrowToken *> parseExpr)
+
+makeStrExpr :: Pos [Char] -> Expr
+makeStrExpr p [] = EmptyListExpr p
+makeStrExpr p [x:xs] = Op2Expr p (CharExpr zero x) BiCons (makeStrExpr p xs)
+
+parseFunCall :: Parser Token (String, [Expr], [FieldSelector])
+parseFunCall = liftM3 (\x y z->(x, y, z))
 	parseIdent 
 	(parseBBraces $ parseSepList CommaToken parseExpr)
+	parseFieldSelectors
 
 parseVarDef :: Parser Token VarDef
 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)))
+parseFieldSelectors = many (satTok DotToken *> 
+	parseIdent >>= \i->case i of
+		"hd" = pure FieldHd
+		"tl" = pure FieldTl 
+		"fst" = pure FieldFst
+		"snd" = pure FieldSnd 
+		_ = empty)
 
 parseOp1 :: Parser Token Op1
 parseOp1 = trans1 DashToken UnMinus <|> trans1 ExclamationToken UnNegation
@@ -185,14 +215,16 @@ peekPos = fst <$> peek
 derive gPrint TokenValue
 derive gEq TokenValue
 satTok :: TokenValue -> Parser Token Token
-satTok t = top >>= \tok=:({line,col},token) -> if (eq t token)
+satTok t = top >>= \tok=:({line,col},token) -> if (tokEq t token)
 	(pure tok) (fail <?> PositionalError line col
-		("ParseError: Unexpected token: " +++ printToString token))
-	where
-		eq (IdentToken _)  (IdentToken _) = True
-		eq (NumberToken _) (NumberToken _) = True
-		eq (CharToken _)   (CharToken _) = True
-		eq x y = gEq {|*|} x y
+		("ParseError: Unexpected token: " +++ printToString token 
+            +++ "\nExpected: " +++ printToString t))
+
+tokEq (IdentToken _) (IdentToken _) = True
+tokEq (NumberToken _) (NumberToken _) = True
+tokEq (CharToken _) (CharToken _) = True
+tokEq (StringToken _) (StringToken _) = True
+tokEq x y = gEq {|*|} x y
 
 parseSepList :: TokenValue (Parser Token a) -> Parser Token [a]
 parseSepList sep p =
@@ -200,7 +232,7 @@ 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)
 
 //liftM only goes to liftM5
 liftM6 f m1 m2 m3 m4 m5 m6 = f <$> m1 <*> m2 <*> m3 <*> m4 <*> m5 <*> m6