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 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 = some parseVarDecl
+ >>= \vd->pure $ AST vd []
-parseVar :: Parser Token VarDecl
-parseVar = parseType
+parseFunDecl :: Parser Token FunDecl
+parseFunDecl = empty
+
+parseVarDecl :: Parser Token VarDecl
+parseVarDecl =
+ (parseType <|> trans1 VarToken VarType )
>>= \t->parseIdent <* satTok AssignmentToken
>>= \i->parseExpr <* satTok SColonToken
>>= \e->pure $ VarDecl i t e
parseType :: Parser Token Type
parseType =
trans1 IntTypeToken IntType <|>
- trans1 VarToken VarType <|>
trans1 CharTypeToken CharType <|>
trans1 BoolTypeToken BoolType <|>
(satTok SquareOpenToken *> parseType <* satTok SquareCloseToken
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
+ parseOpRight (trans1 ColonToken BiCons) $
+ parseOpRight (trans1 PipesToken BiOr) $
+ parseOpRight (trans1 AmpersandsToken BiAnd) $
+ parseOpRight (trans1 EqualsToken BiEquals <|>
+ trans1 LesserToken BiLesser <|>
+ trans1 BiggerToken BiGreater <|>
+ trans1 LesserEqToken BiLesserEq <|>
+ trans1 GreaterEqToken BiGreaterEq <|>
+ trans1 NotEqualToken BiUnEqual) $
+ parseOpLeft (trans1 PlusToken BiPlus <|>
+ trans1 DashToken BiMinus) $
+ parseOpLeft (trans1 StarToken BiTimes <|>
+ trans1 SlashToken BiDivide <|>
+ trans1 PercentToken BiMod) $
+ parseBasicExpr
+ where
+ parseOpRight :: (Parser Token Op2) (Parser Token Expr) -> Parser Token Expr
+ parseOpRight ops prev = prev >>= \e1->optional (
+ ops >>= \op->parseOpRight ops prev >>= \e->pure (op, e)
+ ) >>= \moe->pure $ maybe e1 (\(op,e2)->Op2Expr e1 op e2) moe
+
+ parseOpLeft :: (Parser Token Op2) (Parser Token Expr) -> Parser Token Expr
+ parseOpLeft 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) <|>
+ (parseIdent <* satTok BraceOpenToken
+ >>= \i->parseSepList CommaToken parseExpr <* satTok BraceCloseToken
+ >>= \es->pure $ FunExpr i es) <|>
+ (satTok BraceOpenToken *> parseExpr <* satTok BraceCloseToken) <|>
+ 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) <|>
+ (parseIdent >>= \i->parseFieldSelector >>= \f.pure $ VarExpr 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)) <|>
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":strJoin "\n" (map print v)] ++
+ ["\n":strJoin "\n" (map print f)])
+
+class print a :: a -> [String]
+
+instance print FunDecl where
+ print (FunDecl i as t vs ss) =
+ ["\n", i, " (":strJoin "," (map (\i->[i]) as)] ++
+ [") :: ":print t] ++
+ ["{\n\t":strJoin "\n\t" (map print vs)] ++
+ ["\n":printStatements ss 1] ++ ["\n}"]
+
+printStatements :: [Stmt] Int -> [String]
+printStatements _ _ = []
+
+//TODO
+instance print FunType where
+ print _ = []
+
+//TODO
+instance print Stmt where
+ print _ = []
+
+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) = [s]
+ print IntType = ["Int"]
+ print BoolType = ["Bool"]
+ print CharType = ["Char"]
+ print VarType = ["var"]
+
+strJoin :: String [[String]] -> [String]
+strJoin _ [] = []
+strJoin j [s:rest] = s ++ flatten [[j:ss]\\ss<-rest]
+
+instance print Expr where
+ print (VarExpr i Nothing) = [i]
+ print (VarExpr i (Just mf)) = [i, case mf of
+ FieldHd = ".hd"; FieldTl = ".tl"
+ FieldSnd = ".snd"; FieldFst = ".fst"]
+ 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 i es) = [i,"(":strJoin "," (map print es)] ++ [")"]
+ print EmptyListExpr = ["[]"]
+ print (TupleExpr e1 e2) = ["(":print e1] ++ [",":print e2] ++ [")"]
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