X-Git-Url: https://git.martlubbers.net/?a=blobdiff_plain;f=src%2Fparse.icl;h=ec89565f05c71a9645d3123df289adb81e73633b;hb=eb91d7c6b2010be6a43de0a978373654ba3deacc;hp=d04b0f94c28b169bf5aa9f0f6e7b7db628330fad;hpb=3faf0ef4123af219f9f10560b5fe1aa041a37c4a;p=cc1516.git

diff --git a/src/parse.icl b/src/parse.icl
index d04b0f9..ec89565 100644
--- a/src/parse.icl
+++ b/src/parse.icl
@@ -3,15 +3,16 @@ implementation module parse
 import StdString
 import StdTuple
 import StdList
-from StdFunc import const
+from StdFunc import const, o
 import Data.Either
 import Data.Functor
 import Data.Maybe
 import Control.Monad
 import Control.Applicative
 import Data.Func
-from Data.List import intercalate, replicate
+from Data.List import intercalate, replicate, instance Functor []
 from Text import class Text(concat), instance Text String
+import GenPrint
 
 import yard
 import lex
@@ -23,85 +24,78 @@ parser (Right r) = case runParser parseProgram r of
 	(Left e, _) = Left $ toString e
 
 parseProgram :: Parser Token AST
-parseProgram = many parseVarDecl 
-	>>= \vd->some parseFunDecl
-	>>= \fd->pure $ AST vd fd
+parseProgram = liftM2 AST (many parseVarDecl) (some parseFunDecl) 
+	<* satTok EndOfFileToken
 
 parseFunDecl :: Parser Token FunDecl
-parseFunDecl = parseIdent <* satTok BraceOpenToken
-	>>= \ident->parseSepList CommaToken parseIdent <* satTok BraceCloseToken
-	>>= \args->parseFunType <* satTok CBraceOpenToken 
-	>>= \funtype->many parseVarDecl
-	>>= \vardecls->many parseStmt 
-	<* satTok CBraceCloseToken
-	>>= \stmts->pure $ FunDecl ident args funtype vardecls stmts
+parseFunDecl = liftM5 FunDecl
+	(parseIdent <* satTok BraceOpenToken)
+	(parseSepList CommaToken parseIdent <* satTok BraceCloseToken)
+	(optional parseFunType <* satTok CBraceOpenToken)
+	(many parseVarDecl)
+	(many parseStmt <* satTok CBraceCloseToken)
 
 parseStmt :: Parser Token Stmt
-parseStmt = parseIfStmt <|>
-	parseWhileStmt <|>
-	(parseAssStmt <* satTok SColonToken) <|>
-	(parseReturnStmt <* satTok SColonToken) <|>
-	(parseFunCall <* satTok SColonToken >>= \fc->pure $ FunStmt fc)
+parseStmt = parseIfStmt <|> parseWhileStmt <|>
+	parseSColon parseAssStmt <|> parseSColon parseReturnStmt <|>
+	(liftM FunStmt (parseSColon parseFunCall))
 	where
+		parseSColon :: (Parser Token a) -> Parser Token a
+		parseSColon p = p <* satTok SColonToken
+
 		parseReturnStmt :: Parser Token Stmt
-		parseReturnStmt = satTok ReturnToken 
-			*> optional parseExpr >>= \me->pure $ ReturnStmt me
+		parseReturnStmt =
+			satTok ReturnToken *> liftM ReturnStmt (optional parseExpr)
 
 		parseAssStmt :: Parser Token Stmt
-		parseAssStmt = parseVarDef <* satTok AssignmentToken
-			>>= \var-> parseExpr >>= \expr->pure $ AssStmt var expr
+		parseAssStmt = 
+			liftM2 AssStmt (parseVarDef <* satTok AssignmentToken) parseExpr
 
 		parseIfStmt :: Parser Token Stmt
-		parseIfStmt = satTok IfToken 
-			*> parseBBraces parseExpr
-			>>= \pred->parseBCBraces (many parseStmt)
-			>>= \thens->optional (
-				satTok ElseToken *> parseBCBraces (many parseStmt)
-			)>>= \elses->pure $ IfStmt pred thens (fromMaybe [] elses)
+		parseIfStmt = liftM3 IfStmt
+            (satTok IfToken *> parseBBraces parseExpr)
+            (parseBlock <|> parseOneLine)
+            (liftM (fromMaybe []) 
+                (optional (satTok ElseToken *> (parseBlock<|> parseOneLine))))
+
 
 		parseWhileStmt :: Parser Token Stmt
-		parseWhileStmt = satTok WhileToken *> parseBBraces parseExpr
-			>>= \pred->parseBCBraces (many parseStmt)
-			>>= \body->pure $ WhileStmt pred body
+		parseWhileStmt = satTok WhileToken *> 
+			liftM2 WhileStmt (parseBBraces parseExpr) parseBlock
 
-parseBBraces :: (Parser Token a) -> Parser Token a
-parseBBraces p = satTok BraceOpenToken *> p <* satTok BraceCloseToken
+		parseBlock :: Parser Token [Stmt]
+		parseBlock = parseBCBraces (many parseStmt)
 
-parseBCBraces :: (Parser Token a) -> Parser Token a
-parseBCBraces p = satTok CBraceOpenToken *> p <* satTok CBraceCloseToken
+		parseOneLine :: Parser Token [Stmt]
+		//first pure makes singleton list from the statement
+		parseOneLine = liftM pure parseStmt
 
 parseFunType :: Parser Token FunType
 parseFunType = satTok DoubleColonToken *> 
-	(parseInOutType <|> (parseVoidOrType >>= \t->pure $ FunType [] t))
+	(parseInOutType <|> (liftM (FunType []) parseVoidOrType))
 	where
 		parseInOutType :: Parser Token FunType
-		parseInOutType = some parseType <* satTok ArrowToken
-			>>= \intypes-> parseVoidOrType
-			>>= \outtypes->pure $ FunType intypes outtypes
+		parseInOutType = liftM2 FunType 
+			(some parseType <* satTok ArrowToken) parseVoidOrType
 
 		parseVoidOrType :: Parser Token (Maybe Type)
 		parseVoidOrType = (satTok VoidToken *> pure Nothing) <|> 
-			(parseType >>= \type->pure $ Just type)
+			(liftM Just parseType) <|> pure Nothing
 
 parseVarDecl :: Parser Token VarDecl
-parseVarDecl = 
+parseVarDecl = liftM3 VarDecl
 	(parseType <|> trans1 VarToken VarType )
-	>>= \t->parseIdent <* satTok AssignmentToken
-	>>= \i->parseExpr <* satTok SColonToken
-	>>= \e->pure $ VarDecl i t e
+	(parseIdent <* satTok AssignmentToken)
+	(parseExpr <* satTok SColonToken)
 
 parseType :: Parser Token Type
 parseType = 
 	trans1 IntTypeToken IntType <|>
 	trans1 CharTypeToken CharType <|>
 	trans1 BoolTypeToken BoolType <|>
-	(satTok SquareOpenToken *> parseType <* satTok SquareCloseToken 
-		>>= \t.pure $ ListType t) <|>
-	(satTok BraceOpenToken *> parseType <* satTok CommaToken 
-		>>= \t1->parseType <* satTok BraceCloseToken 
-		>>= \t2->pure $ TupleType t1 t2) <|>
-	(parseIdent >>= \e.pure $ IdType e) <|>
-	empty
+	(liftM ListType (parseBSqBraces parseType)) <|>
+	(liftM TupleType (parseTuple parseType)) <|>
+	(liftM IdType parseIdent)
 
 parseExpr :: Parser Token Expr
 parseExpr = //Operators in order of binding strength
@@ -132,53 +126,72 @@ parseExpr = //Operators in order of binding strength
 
 		parseBasicExpr :: Parser Token Expr
 		parseBasicExpr = 
-			(satTok BraceOpenToken *> parseExpr <* satTok CommaToken 
-				>>= \e1->parseExpr <* satTok BraceCloseToken 
-				>>= \e2->pure $ TupleExpr e1 e2) <|>
-			(parseFunCall >>= \fc->pure $ FunExpr fc) <|>
+			(liftM TupleExpr (parseTuple parseExpr)) <|>
+			(liftM FunExpr parseFunCall) <|>
 			parseBBraces parseExpr <|>
 			trans1 EmptyListToken EmptyListExpr <|>
-			trans2 TrueToken (const $ BoolExpr True) <|>
-			trans2 FalseToken (const $ BoolExpr False) <|>
+			trans1 TrueToken (BoolExpr True) <|>
+			trans1 FalseToken (BoolExpr False) <|>
 			trans2 (NumberToken zero) (\(NumberToken i)->IntExpr i) <|>
 			trans2 (CharToken zero) (\(CharToken c)->CharExpr c) <|>
-			(parseOp1 >>= \o->parseExpr >>= \e.pure $ Op1Expr o e) <|>
-			(parseVarDef >>= \ve->pure $ VarExpr ve)
+			(liftM2 Op1Expr parseOp1 parseExpr) <|>
+			(liftM VarExpr parseVarDef)
 
 parseFunCall :: Parser Token FunCall
-parseFunCall = parseIdent <* satTok BraceOpenToken 
-	>>= \i->parseSepList CommaToken parseExpr 
-	<* satTok BraceCloseToken >>= \es->pure $ FunCall i es
+parseFunCall = liftM2 FunCall
+	parseIdent (parseBBraces $ parseSepList CommaToken parseExpr)
 
 parseVarDef :: Parser Token VarDef
-parseVarDef = parseIdent 
-	>>= \i-> many (satTok DotToken *> (
+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))
-	) >>= \f->pure $ VarDef i f
+		(parseIdent >>= \i.if (i == "snd") (pure FieldSnd) empty))))
 
 parseOp1 :: Parser Token Op1
-parseOp1 = trans1 DashToken UnMinus <|> 
-	trans1 ExclamationToken UnNegation
+parseOp1 = trans1 DashToken UnMinus <|> trans1 ExclamationToken UnNegation
+
+parseBBraces :: (Parser Token a) -> Parser Token a
+parseBBraces p = satTok BraceOpenToken *> p <* satTok BraceCloseToken
+
+parseBCBraces :: (Parser Token a) -> Parser Token a
+parseBCBraces p = satTok CBraceOpenToken *> p <* satTok CBraceCloseToken
+
+parseBSqBraces :: (Parser Token a) -> Parser Token a
+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) 
+	<* satTok BraceCloseToken
 
 trans2 :: TokenValue (TokenValue -> a) -> Parser Token a
-trans2 t f = satTok t >>= \(_, r).pure (f r)
+trans2 t f = liftM (f o thd3) $ satTok t
 
 trans1 :: TokenValue a -> Parser Token a
 trans1 t r = trans2 t $ const r
 
+derive gPrint TokenValue
+derive gEq TokenValue
 satTok :: TokenValue -> Parser Token Token
-satTok t = satisfy ((===) t)
+satTok t = top >>= \tok=:(pos1, pos2, tv) -> if (eq t tok) 
+                                            (return tok) 
+                                            (fail <?> (printToString tv+++printToString t, pos1))
+	where
+		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 = 
-	(some (p <* satTok sep) >>= \es->p >>= \e.pure $ reverse [e:es]) <|>
-	(p >>= \e->pure [e]) <|> pure []
+	(liftM2 (\es->(\e->reverse [e:es])) (some (p <* satTok 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 (
@@ -193,37 +206,42 @@ printersperse i j = intercalate [i] (map print j)
 instance print FunDecl where
 	print (FunDecl i as t vs ss) =
 		["\n", i, " (":printersperse "," as] ++
-		[") :: ":print t] ++
+		[")"] ++ maybe [] (\tt->[" :: ":print tt]) t ++
 		["{\n\t":printersperse "\n\t" vs] ++
-		["\n":printStatements ss 1] ++ ["\n}"]
+		["\n":printStatements ss 1] ++ ["}\n"]
 
 printStatements :: [Stmt] Int -> [String]
 printStatements [] i = []
 printStatements [s:ss] i = (case s of
-	(IfStmt b thens elses) = indent i ["if (":print b] ++ ["){\n"] ++
-		printStatements thens (i+1) ++ 
-		indent i ["} else {\n":printStatements elses (i+1)] ++ 
-		indent i ["}\n"]
+	(IfStmt b thens elses) = indent i ["if (":print b] ++ [")"] ++
+		printCodeBlock thens i ++ 
+		indent i ["else ":printCodeBlock elses i] ++ ["\n"]
 	(WhileStmt b dos) = indent i ["while (":print b] ++ 
-		["){\n":printStatements dos (i+1)] ++ indent i ["}\n"]
+		[")":printCodeBlock dos i]
 	(AssStmt vardef val) =
 		indent i $ print vardef ++ ["=":print val] ++ [";\n"]
 	(FunStmt fc) = indent i $ print fc ++ [";\n"]
 	(ReturnStmt me) = indent i ["return ":maybe [""] print me] ++ [";\n"]
 	) ++ printStatements ss i
+	where
+		printCodeBlock :: [Stmt] Int -> [String]
+		printCodeBlock [] _ = ["{}\n"]
+		printCodeBlock [x] i = ["\n":printStatements [x] (i+1)]
+		printCodeBlock x i =
+			["{\n":printStatements x (i+1)] ++ indent i ["}\n"]
 
-indent :: Int [String] -> [String]
-indent i rest = replicate i "\t" ++ rest
+		indent :: Int [String] -> [String]
+		indent i rest = replicate i "\t" ++ rest
 
 instance print FunType where
 	print (FunType at rt) = printersperse " " at ++
 		[if (isEmpty at) "" "->":maybe ["Void"] print rt]
 
 instance print VarDecl where
-	print (VarDecl i t 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] ++ [")"]
+	print (TupleType (t1, t2)) = ["(":print t1] ++ [",":print t2] ++ [")"]
 	print (ListType t) = ["[":print t] ++ ["]"]
 	print (IdType s) = print s
 	print IntType = print "Int"
@@ -266,4 +284,4 @@ instance print Expr where
 	print (BoolExpr b) = [toString b]
 	print (FunExpr fc) = print fc
 	print EmptyListExpr = ["[]"]
-	print (TupleExpr e1 e2) = ["(":print e1] ++ [",":print e2] ++ [")"]
+	print (TupleExpr (e1, e2)) = ["(":print e1] ++ [",":print e2] ++ [")"]