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
(Left e, _) = Left $ toString e
parseProgram :: Parser Token AST
-parseProgram = some parseVarDecl
- >>= \vd->pure $ AST vd []
+parseProgram = many parseVarDecl
+ >>= \vd->some parseFunDecl
+ >>= \fd->pure $ AST vd fd
parseFunDecl :: Parser Token FunDecl
-parseFunDecl = empty
+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 =
parseExpr :: Parser Token Expr
parseExpr = //Operators in order of binding strength
- parseOpRight (trans1 ColonToken BiCons) $
- parseOpRight (trans1 PipesToken BiOr) $
- parseOpRight (trans1 AmpersandsToken BiAnd) $
- parseOpRight (trans1 EqualsToken BiEquals <|>
+ 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) $
- parseOpLeft (trans1 PlusToken BiPlus <|>
+ parseOpL (trans1 PlusToken BiPlus <|>
trans1 DashToken BiMinus) $
- parseOpLeft (trans1 StarToken BiTimes <|>
+ parseOpL (trans1 StarToken BiTimes <|>
trans1 SlashToken BiDivide <|>
- trans1 PercentToken BiMod) $
- parseBasicExpr
+ 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)
+ 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
- parseOpLeft :: (Parser Token Op2) (Parser Token Expr) -> Parser Token Expr
- parseOpLeft ops prev = prev >>= \e1->many (
+ 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
(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) <|>
+ (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) <|>
- (parseIdent >>= \i->parseFieldSelector >>= \f.pure $ VarExpr i f)
+ (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
-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)
instance toString AST where
toString (AST v f) = concat (
- ["\n":strJoin "\n" (map print v)] ++
- ["\n":strJoin "\n" (map print f)])
+ ["\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, " (":strJoin "," (map (\i->[i]) as)] ++
+ ["\n", i, " (":printersperse "," as] ++
[") :: ":print t] ++
- ["{\n\t":strJoin "\n\t" (map print vs)] ++
+ ["{\n\t":printersperse "\n\t" vs] ++
["\n":printStatements ss 1] ++ ["\n}"]
printStatements :: [Stmt] Int -> [String]
-printStatements _ _ = []
+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
-//TODO
-instance print FunType where
- print _ = []
+indent :: Int [String] -> [String]
+indent i rest = replicate i "\t" ++ rest
-//TODO
-instance print Stmt where
- print _ = []
+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 (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"]
+ 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]
-strJoin :: String [[String]] -> [String]
-strJoin _ [] = []
-strJoin j [s:rest] = s ++ flatten [[j:ss]\\ss<-rest]
+instance print FunCall where
+ print (FunCall i args) = [i,"(":printersperse "," args] ++ [")"]
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
+ 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 e2] ++ [")"]
print (Op1Expr o e) = ["(",case o of
UnNegation = "!"; UnMinus = "-"
:print e] ++ [")"]
c = if (c == toChar 7) "\\a" (toString c)
,"\'"]
print (BoolExpr b) = [toString b]
- print (FunExpr i es) = [i,"(":strJoin "," (map print es)] ++ [")"]
+ print (FunExpr fc) = print fc
print EmptyListExpr = ["[]"]
print (TupleExpr e1 e2) = ["(":print e1] ++ [",":print e2] ++ [")"]
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