tools/pas2c.hs
author nemo
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module Pas2C where
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import PascalParser
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import Text.PrettyPrint.HughesPJ
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import Data.Maybe
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import Data.Char
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import Text.Parsec.String
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pas2C :: String -> IO String
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pas2C fileName = do
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    ptree <- parseFromFile pascalUnit fileName
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    case ptree of
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         (Left a) -> return (show a)
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         (Right a) -> (return . render . pascal2C) a
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pascal2C :: PascalUnit -> Doc
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pascal2C (Unit unitName interface implementation init fin) = implementation2C implementation
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implementation2C :: Implementation -> Doc
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implementation2C (Implementation uses tvars) = typesAndVars2C tvars
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typesAndVars2C :: TypesAndVars -> Doc
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typesAndVars2C (TypesAndVars ts) = vcat $ map tvar2C ts
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tvar2C :: TypeVarDeclaration -> Doc
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tvar2C (FunctionDeclaration (Identifier name) returnType Nothing) = 
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    type2C returnType <+> text (name ++ "();")
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tvar2C (FunctionDeclaration (Identifier name) returnType (Just phrase)) = 
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    type2C returnType <+> text (name ++ "()") 
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    $$
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    phrase2C phrase
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tvar2C (TypeDeclaration (Identifier i) t) = text "type" <+> text i <+> type2C t <> text ";"
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tvar2C (VarDeclaration isConst (ids, t) mInitExpr) = 
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    if isConst then text "const" else empty
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    <+>
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    type2C t
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    <+>
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    (hsep . punctuate (char ',') . map (\(Identifier i) -> text i) $ ids)
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    <+>
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    initExpr mInitExpr
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    <>
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    text ";"
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    where
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    initExpr Nothing = empty
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    initExpr (Just e) = text "=" <+> initExpr2C e
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initExpr2C :: InitExpression -> Doc    
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initExpr2C _ = text "<<expression>>"
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type2C :: TypeDecl -> Doc
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type2C UnknownType = text "void"
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type2C String = text "string"
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type2C (SimpleType (Identifier i)) = text i
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type2C (PointerTo t) = type2C t <> text "*"
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type2C (RecordType tvs) = text "{" $+$ (nest 4 . vcat . map tvar2C $ tvs) $+$ text "}"
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type2C (RangeType r) = text "<<range type>>"
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type2C (Sequence ids) = text "<<sequence type>>"
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type2C (ArrayDecl r t) = text "<<array type>>"
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phrase2C :: Phrase -> Doc
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phrase2C (Phrases p) = text "{" $+$ (nest 4 . vcat . map phrase2C $ p) $+$ text "}"
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phrase2C (ProcCall (Identifier name) params) = text name <> parens (hsep . punctuate (char ',') . map expr2C $ params) <> semi
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phrase2C (IfThenElse (expr) phrase1 mphrase2) = text "if" <> parens (expr2C expr) $+$ (phrase2C . wrapPhrase) phrase1 $+$ elsePart
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    where
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    elsePart | isNothing mphrase2 = empty
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             | otherwise = text "else" $$ (phrase2C . wrapPhrase) (fromJust mphrase2)
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phrase2C (Assignment ref expr) = ref2C ref <> text " = " <> expr2C expr <> semi
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phrase2C (WhileCycle expr phrase) = text "while" <> parens (expr2C expr) $$ (phrase2C $ wrapPhrase phrase)
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phrase2C (SwitchCase expr cases mphrase) = text "switch" <> parens (expr2C expr) <> text "of" $+$ (nest 4 . vcat . map case2C) cases
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    where
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    case2C :: (Expression, Phrase) -> Doc
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    case2C (e, p) = text "case" <+> parens (expr2C e) <> char ':' <> nest 4 (phrase2C p $+$ text "break;")
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phrase2C (WithBlock ref p) = text "namespace" <> parens (ref2C ref) $$ (phrase2C $ wrapPhrase p)
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phrase2C (ForCycle (Identifier i) e1 e2 p) = 
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    text "for" <> (parens . hsep . punctuate (char ';') $ [text i <+> text "=" <+> expr2C e1, text i <+> text "<=" <+> expr2C e2, text "++" <> text i])
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    $$
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    phrase2C (wrapPhrase p)
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phrase2C (RepeatCycle e p) = text "do" <+> phrase2C (Phrases p) <+> text "while" <> parens (text "!" <> parens (expr2C e))
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wrapPhrase p@(Phrases _) = p
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wrapPhrase p = Phrases [p]
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expr2C :: Expression -> Doc
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expr2C (Expression s) = text s
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expr2C (BinOp op expr1 expr2) = parens $ (expr2C expr1) <+> op2C op <+> (expr2C expr2)
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expr2C (NumberLiteral s) = text s
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expr2C (HexNumber s) = text "0x" <> (text . map toLower $ s)
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expr2C (StringLiteral s) = doubleQuotes $ text s 
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expr2C (Reference ref) = ref2C ref
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expr2C (PrefixOp op expr) = op2C op <+> expr2C expr
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    {-
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    | PostfixOp String Expression
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    | CharCode String
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    -}            
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expr2C _ = empty
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ref2C :: Reference -> Doc
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ref2C (ArrayElement exprs ref) = ref2C ref <> (brackets . hcat) (punctuate comma $ map expr2C exprs)
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ref2C (SimpleReference (Identifier name)) = text name
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ref2C (RecordField (Dereference ref1) ref2) = ref2C ref1 <> text "->" <> ref2C ref2
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ref2C (RecordField ref1 ref2) = ref2C ref1 <> text "." <> ref2C ref2
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ref2C (Dereference ref) = parens $ text "*" <> ref2C ref
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ref2C (FunCall params ref) = ref2C ref <> parens (hsep . punctuate (char ',') . map expr2C $ params)
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ref2C (Address ref) = text "&" <> ref2C ref
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op2C "or" = text "|"
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op2C "and" = text "&"
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op2C "not" = text "!"
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op2C "xor" = text "^"
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op2C "div" = text "/"
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op2C "mod" = text "%"
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op2C "shl" = text "<<"
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op2C "shr" = text ">>"
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op2C "<>" = text "!="
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op2C "=" = text "=="
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op2C a = text a
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maybeVoid "" = "void"
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maybeVoid a = a