X-Git-Url: https://git.martlubbers.net/?a=blobdiff_plain;f=src%2Fparse.icl;h=e22cba4c0b1496e80ec370e0e4b0307da92a9568;hb=50b5f82d49946ae0125b1815903865eb11a386b4;hp=fdcb9e329497a3e88f95212593dca6114aef3bbc;hpb=b4636110ab65f233ed40d4390b62c7799df3c949;p=cc1516.git

diff --git a/src/parse.icl b/src/parse.icl
index fdcb9e3..e22cba4 100644
--- a/src/parse.icl
+++ b/src/parse.icl
@@ -5,24 +5,95 @@ import StdTuple
 import StdList
 from StdFunc import const
 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 Text import class Text(concat), instance Text String
 
 import yard
 import lex
 
-parse :: LexerOutput -> ParserOutput
-parse (Left e) = Left $ toString $ LexError e
-parse (Right r) = case runParser parseProgram r of
+parser :: LexerOutput -> ParserOutput
+parser (Left e) = Left $ toString $ LexError e
+parser (Right r) = case runParser parseProgram r of
 	(Right p, _) = Right p
 	(Left e, _) = Left $ toString e
 
 parseProgram :: Parser Token AST
-parseProgram = parseVar >>= \t.pure $ AST [t] []
+parseProgram = many parseVarDecl 
+	>>= \vd->some parseFunDecl
+	>>= \fd->pure $ AST vd fd
 
-parseVar :: Parser Token VarDecl
-parseVar = parseType 
+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
+
+parseStmt :: Parser Token Stmt
+parseStmt = parseIfStmt <|>
+	parseWhileStmt <|>
+	parseSColon parseAssStmt <|>
+	parseSColon parseReturnStmt <|>
+	(parseSColon parseFunCall >>= \fc->pure $ FunStmt fc)
+	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
+
+		parseAssStmt :: Parser Token Stmt
+		parseAssStmt = parseVarDef <* satTok AssignmentToken
+			>>= \var-> parseExpr >>= \expr->pure $ AssStmt var expr
+
+		parseIfStmt :: Parser Token Stmt
+		parseIfStmt = satTok IfToken 
+			*> parseBBraces parseExpr
+			>>= \pred->(parseBlock <|> parseOneLine)
+			>>= \thens->optional (
+				satTok ElseToken *> (parseBlock <|> parseOneLine)
+			)>>= \elses->pure $ IfStmt pred thens (fromMaybe [] elses)
+
+		parseWhileStmt :: Parser Token Stmt
+		parseWhileStmt = satTok WhileToken *> parseBBraces parseExpr
+			>>= \pred->parseBlock >>= \body->pure $ WhileStmt pred body
+
+		parseBlock :: Parser Token [Stmt]
+		parseBlock = parseBCBraces (many parseStmt)
+
+		parseOneLine :: Parser Token [Stmt]
+		parseOneLine = parseStmt >>= \s->pure [s]
+
+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
+
+parseFunType :: Parser Token FunType
+parseFunType = satTok DoubleColonToken *> 
+	(parseInOutType <|> (parseVoidOrType >>= \t->pure $ FunType [] t))
+	where
+		parseInOutType :: Parser Token FunType
+		parseInOutType = some parseType <* satTok ArrowToken
+			>>= \intypes-> parseVoidOrType
+			>>= \outtypes->pure $ FunType intypes outtypes
+
+		parseVoidOrType :: Parser Token (Maybe Type)
+		parseVoidOrType = (satTok VoidToken *> pure Nothing) <|> 
+			(parseType >>= \type->pure $ Just type)
+
+parseVarDecl :: Parser Token VarDecl
+parseVarDecl = 
+	(parseType <|> trans1 VarToken VarType )
 	>>= \t->parseIdent <* satTok AssignmentToken
 	>>= \i->parseExpr <* satTok SColonToken
 	>>= \e->pure $ VarDecl i t e
@@ -30,7 +101,6 @@ parseVar = parseType
 parseType :: Parser Token Type
 parseType = 
 	trans1 IntTypeToken IntType <|>
-	trans1 VarToken VarType <|>
 	trans1 CharTypeToken CharType <|>
 	trans1 BoolTypeToken BoolType <|>
 	(satTok SquareOpenToken *> parseType <* satTok SquareCloseToken 
@@ -42,39 +112,65 @@ parseType =
 	empty
 
 parseExpr :: Parser Token Expr
-parseExpr = 
-	(satTok BraceOpenToken *> parseExpr <* satTok BraceCloseToken) <|>
-	(satTok BraceOpenToken *> parseExpr <* satTok CommaToken 
-		>>= \e1->parseExpr <* satTok BraceCloseToken 
-		>>= \e2->pure $ TupleExpr e1 e2) <|>
-	trans1 EmptyListToken EmptyListExpr <|>
-	trans2 TrueToken (const $ BoolExpr True) <|>
-	trans2 FalseToken (const $ BoolExpr True) <|>
-	trans2 (NumberToken zero) (\(NumberToken i)->IntExpr i) <|>
-	trans2 (CharToken zero) (\(CharToken c)->CharExpr c) <|>
-	(parseOp1 >>= \o->parseExpr >>= \e.pure $ Op1Expr o e) <|>
-	(parseIdent >>= \i. parseFieldSelector >>= \f.pure $ VarExpr i f)
+parseExpr = //Operators in order of binding strength
+	parseOpR (trans1 ColonToken BiCons) $
+	parseOpR (trans1 PipesToken BiOr) $
+	parseOpR (trans1 AmpersandsToken BiAnd) $
+	parseOpR (trans1 EqualsToken BiEquals <|>
+			trans1 LesserToken BiLesser <|>
+			trans1 BiggerToken BiGreater <|>
+			trans1 LesserEqToken BiLesserEq <|>
+			trans1 GreaterEqToken BiGreaterEq <|>
+			trans1 NotEqualToken BiUnEqual) $
+	parseOpL (trans1 PlusToken BiPlus <|>
+			trans1 DashToken BiMinus) $
+	parseOpL (trans1 StarToken BiTimes <|>
+			trans1 SlashToken BiDivide <|>
+			trans1 PercentToken BiMod) $ parseBasicExpr
+	where
+		parseOpR :: (Parser Token Op2) (Parser Token Expr) -> Parser Token Expr
+		parseOpR ops prev = prev >>= \e1->optional (
+				ops >>= \op->parseOpR ops prev >>= \e->pure (op, e)
+			) >>= \moe->pure $ maybe e1 (\(op,e2)->Op2Expr 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
+
+		parseBasicExpr :: Parser Token Expr
+		parseBasicExpr = 
+			(satTok BraceOpenToken *> parseExpr <* satTok CommaToken 
+				>>= \e1->parseExpr <* satTok BraceCloseToken 
+				>>= \e2->pure $ TupleExpr e1 e2) <|>
+			(parseFunCall >>= \fc->pure $ FunExpr fc) <|>
+			parseBBraces parseExpr <|>
+			trans1 EmptyListToken EmptyListExpr <|>
+			trans2 TrueToken (const $ BoolExpr True) <|>
+			trans2 FalseToken (const $ 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)
+
+parseFunCall :: Parser Token FunCall
+parseFunCall = parseIdent <* satTok BraceOpenToken 
+	>>= \i->parseSepList CommaToken parseExpr 
+	<* satTok BraceCloseToken >>= \es->pure $ FunCall i es
+
+parseVarDef :: Parser Token VarDef
+parseVarDef = parseIdent 
+	>>= \i-> 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
 
 parseOp1 :: Parser Token Op1
 parseOp1 = trans1 DashToken UnMinus <|> 
 	trans1 ExclamationToken UnNegation
 
-parseOp2 :: Parser Token Op2
-parseOp2 = trans1 StarToken BiTimes <|> trans1 SlashToken BiDivide <|>
-	trans1 PercentToken BiMod <|> trans1 EqualsToken BiEquals <|>
-	trans1 LesserToken BiLesser <|> trans1 BiggerToken BiGreater <|>
-	trans1 LesserEqToken BiLesserEq <|> trans1 PlusToken BiPlus <|>
-	trans1 GreaterEqToken BiGreaterEq <|> trans1 DashToken BiMinus <|>
-	trans1 NotEqualToken BiUnEqual <|> trans1 AmpersandsToken BiAnd <|>
-	trans1 PipesToken BiOr <|> trans1 ColonToken BiCons
-
-parseFieldSelector :: Parser Token (Maybe FieldSelector)
-parseFieldSelector = optional (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)))
-
 trans2 :: TokenValue (TokenValue -> a) -> Parser Token a
 trans2 t f = satTok t >>= \(_, r).pure (f r)
 
@@ -84,5 +180,103 @@ trans1 t r = trans2 t $ const r
 satTok :: TokenValue -> Parser Token Token
 satTok t = satisfy ((===) t)
 
+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 []
+
 parseIdent :: Parser Token String
 parseIdent = trans2 (IdentToken []) (\(IdentToken e).toString e)
+
+instance toString AST where
+	toString (AST v f) = concat (
+		["\n":printersperse "\n" v] ++
+		["\n":printersperse "\n" f])
+
+class print a :: a -> [String]
+
+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) =
+		["\n", i, " (":printersperse "," as] ++
+		[") :: ":print t] ++
+		["{":printersperse "\n\t" vs] ++
+		["\n":printStatements ss 1] ++ ["}"]
+
+printStatements :: [Stmt] Int -> [String]
+printStatements [] i = []
+printStatements [s:ss] i = (case s of
+	(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] ++ 
+		[")":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 [] _ = ["{}"]
+		printCodeBlock [x] i = ["\n":printStatements [x] (i+1)]
+		printCodeBlock x i =
+			["{\n":printStatements x (i+1)] ++ indent i ["}"]
+
+		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] ++ [";"]
+
+instance print Type where
+	print (TupleType t1 t2) = ["(":print t1] ++ [",":print t2] ++ [")"]
+	print (ListType t) = ["[":print t] ++ ["]"]
+	print (IdType s) = print s
+	print IntType = print "Int"
+	print BoolType = print "Bool"
+	print CharType = print "Char"
+	print VarType = print "var"
+
+instance print String where
+	print s = [s]
+
+instance print FieldSelector where	
+	print FieldHd = print "hd"
+	print FieldTl = print "tl"
+	print FieldSnd = print "snd"
+	print FieldFst = print "fst"
+
+instance print VarDef where
+	print (VarDef i fs) = printersperse "." [i:flatten $ map print fs]
+
+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
+		BiPlus = "+"; BiMinus = "-"; BiTimes = "*"; BiDivide = "/"
+		BiMod = "%"; BiEquals = "="; BiLesser = "<"; BiGreater = ">"
+		BiLesserEq = "<="; BiGreaterEq = ">="; BiUnEqual = "!=";
+		BiAnd = "&&"; BiOr = "||"; BiCons = ":"
+		," ":print e2] ++ [")"]
+	print (Op1Expr o e) = ["(",case o of
+		UnNegation = "!"; UnMinus = "-"
+		:print e] ++ [")"]
+	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] ++ [")"]