X-Git-Url: https://git.martlubbers.net/?a=blobdiff_plain;f=parse.icl;h=acd7d9c5941ada0eb377ad866065ca65d57b93e7;hb=6b3981fb80952fe2c510b6f9b849adb0dff77d2c;hp=3344e27bdbe717a7d7ccf77f9f561440947ce736;hpb=953019d8255b9779d67fb1cb6c8946f589a24936;p=cc1516.git

diff --git a/parse.icl b/parse.icl
index 3344e27..acd7d9c 100644
--- a/parse.icl
+++ b/parse.icl
@@ -1,9 +1,283 @@
 implementation module parse
 
 import StdString
+import StdTuple
+import StdList
+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, instance Functor []
+from Text import class Text(concat), instance Text String
+import GenPrint
 
+import yard
 import lex
 
-parse :: LexerOutput -> ParserOutput
-parse (Left e) = Left ("Lexer error: " +++ e)
-parse (Right r) = Left "Parser not yet implemented"
+parser :: LexerOutput -> ParserOutput
+parser (Left e) = Left e
+parser (Right r) = fst $ runParser parseProgram r
+
+parseProgram :: Parser Token AST
+parseProgram = liftM2 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)
+	(many parseStmt <* satTok CBraceCloseToken)
+
+parseStmt :: Parser Token Stmt
+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 *> liftM ReturnStmt (optional parseExpr)
+
+		parseAssStmt :: Parser Token Stmt
+		parseAssStmt = 
+			liftM2 AssStmt (parseVarDef <* satTok AssignmentToken) parseExpr
+
+		parseIfStmt :: Parser Token Stmt
+		parseIfStmt = liftM3 IfStmt
+            (satTok IfToken *> parseBBraces parseExpr)
+            (parseBlock <|> parseOneLine)
+            (liftM (fromMaybe []) 
+                (optional (satTok ElseToken *> (parseBlock<|> parseOneLine))))
+
+
+		parseWhileStmt :: Parser Token Stmt
+		parseWhileStmt = satTok WhileToken *> 
+			liftM2 WhileStmt (parseBBraces parseExpr) parseBlock
+
+		parseBlock :: Parser Token [Stmt]
+		parseBlock = parseBCBraces (many parseStmt)
+
+		parseOneLine :: Parser Token [Stmt]
+		//first pure makes singleton list from the statement
+		parseOneLine = liftM pure parseStmt
+
+parseFunType :: Parser Token FunType
+parseFunType = satTok DoubleColonToken *> 
+	(parseInOutType <|> (liftM (FunType []) parseVoidOrType))
+	where
+		parseInOutType :: Parser Token FunType
+		parseInOutType = liftM2 FunType 
+			(some parseType <* satTok ArrowToken) parseVoidOrType
+
+		parseVoidOrType :: Parser Token (Maybe Type)
+		parseVoidOrType = (satTok VoidToken *> pure Nothing) <|> 
+			(liftM Just parseType) <|> pure Nothing
+
+parseVarDecl :: Parser Token VarDecl
+parseVarDecl = liftM3 VarDecl
+	(parseType <|> trans1 VarToken VarType )
+	(parseIdent <* satTok AssignmentToken)
+	(parseExpr <* satTok SColonToken)
+
+parseType :: Parser Token Type
+parseType = 
+	trans1 IntTypeToken IntType <|>
+	trans1 CharTypeToken CharType <|>
+	trans1 BoolTypeToken BoolType <|>
+	(liftM ListType (parseBSqBraces parseType)) <|>
+	(liftM TupleType (parseTuple parseType)) <|>
+	(liftM IdType parseIdent)
+
+parseExpr :: Parser Token Expr
+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 = 
+			(liftM TupleExpr (parseTuple parseExpr)) <|>
+			(liftM FunExpr 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) <|>
+			(liftM2 Op1Expr parseOp1 parseExpr) <|>
+			(liftM VarExpr parseVarDef)
+
+parseFunCall :: Parser Token FunCall
+parseFunCall = liftM2 FunCall
+	parseIdent (parseBBraces $ parseSepList CommaToken parseExpr)
+
+parseVarDef :: Parser Token VarDef
+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))))
+
+parseOp1 :: Parser Token Op1
+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 = liftM (\{token}->f token) $ 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 = top >>= \tok=:{line,column,token} -> if (eq t token) 
+	(return tok) (fail <?> PositionalError line column ("ParseError: Unexpected token: " +++ printToString token))
+	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 = 
+	(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)
+
+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] ++
+		[")"] ++ maybe [] (\tt->[" :: ":print tt]) t ++
+		["{\n\t":printersperse "\n\t" vs] ++
+		["\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] ++ [")"] ++
+		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 [] _ = ["{}\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
+
+instance print FunType where
+	print (FunType at rt) = printersperse " " at ++
+		[if (isEmpty at) "" "->":maybe ["Void"] print rt]
+
+instance print VarDecl where
+	print (VarDecl t i 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] ++ [")"]