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 <|>
+ (parseAssStmt <* satTok SColonToken) <|>
+ (parseReturnStmt <* satTok SColonToken) <|>
+ (parseFunCall <* satTok SColonToken >>= \fc->pure $ FunStmt fc)
+ where
+ 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->parseBCBraces (many parseStmt)
+ >>= \thens->optional (
+ satTok ElseToken *> parseBCBraces (many parseStmt)
+ )>>= \elses->pure $ IfStmt pred thens (fromMaybe [] elses)
+
+ parseWhileStmt :: Parser Token Stmt
+ parseWhileStmt = satTok WhileToken *> parseBBraces parseExpr
+ >>= \pred->parseBCBraces (many parseStmt)
+ >>= \body->pure $ WhileStmt pred body
+
+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
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
+ 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)
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] ++
+ ["{\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] ++ ["){\n"] ++
+ printStatements thens (i+1) ++
+ indent i ["} else {\n":printStatements elses (i+1)] ++
+ indent i ["}\n"]
+ (WhileStmt b dos) = indent i ["while (":print b] ++
+ ["){\n":printStatements dos (i+1)] ++ indent i ["}\n"]
+ (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
+
+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] ++ [")"]
repositories / cc1516.git / blobdiff