tools/pas2c.hs
author koda
Sun, 15 Jan 2012 23:50:41 +0100
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module Pas2C where
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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.Prim hiding (State)
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import Control.Monad.State
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import System.IO
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import System.Directory
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import Control.Monad.IO.Class
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import PascalPreprocessor
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import Control.Exception
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import System.IO.Error
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import qualified Data.Map as Map
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import Data.List (find)
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import PascalParser
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import PascalUnitSyntaxTree
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data RenderState = RenderState 
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    {
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        currentScope :: [(String, String)],
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        namespaces :: Map.Map String [(String, String)]
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    }
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pas2C :: String -> IO ()
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pas2C fn = do
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    setCurrentDirectory "../hedgewars/"
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    s <- flip execStateT initState $ f fn
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    renderCFiles s
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    where
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    printLn = liftIO . hPutStrLn stderr
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    print = liftIO . hPutStr stderr
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    initState = Map.empty
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    f :: String -> StateT (Map.Map String PascalUnit) IO ()
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    f fileName = do
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        processed <- gets $ Map.member fileName
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        unless processed $ do
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            print ("Preprocessing '" ++ fileName ++ ".pas'... ")
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            fc' <- liftIO 
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                $ tryJust (guard . isDoesNotExistError) 
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                $ preprocess (fileName ++ ".pas")
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            case fc' of
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                (Left a) -> do
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                    modify (Map.insert fileName (System []))
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                    printLn "doesn't exist"
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                (Right fc) -> do
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                    print "ok, parsing... "
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                    let ptree = parse pascalUnit fileName fc
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                    case ptree of
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                         (Left a) -> do
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                            liftIO $ writeFile "preprocess.out" fc
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                            printLn $ show a ++ "\nsee preprocess.out for preprocessed source"
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                            fail "stop"
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                         (Right a) -> do
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                            printLn "ok"
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                            modify (Map.insert fileName a)
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                            mapM_ f (usesFiles a)
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renderCFiles :: Map.Map String PascalUnit -> IO ()
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renderCFiles units = do
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    let u = Map.toList units
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    let ns = Map.map toNamespace units
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    mapM_ (toCFiles ns) u
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    where
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    toNamespace :: PascalUnit -> [(String, String)]
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    toNamespace = concatMap tv2id . extractTVs
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    extractTVs (System tv) = tv
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    extractTVs (Program {}) = []
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    extractTVs (Unit _ (Interface _ (TypesAndVars tv)) _ _ _) = tv
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    tv2id :: TypeVarDeclaration -> [(String, String)]
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    tv2id (TypeDeclaration i (Sequence ids)) = map (\(Identifier i _) -> fi i) $ i : ids
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    tv2id (TypeDeclaration (Identifier i _) _) = [(map toLower i, i)]
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    tv2id (VarDeclaration _ (ids, _) _) = map (\(Identifier i _) -> fi i) ids
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    tv2id (FunctionDeclaration (Identifier i _) _ _ _) = [fi i]
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    tv2id (OperatorDeclaration i _ _ _ _) = [fi i]
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    fi i = (map toLower i, i)
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toCFiles :: Map.Map String [(String, String)] -> (String, PascalUnit) -> IO ()
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toCFiles _ (_, System _) = return ()
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toCFiles ns p@(fn, pu) = do
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    hPutStrLn stderr $ "Rendering '" ++ fn ++ "'..."
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    toCFiles' p
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    where
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    toCFiles' (fn, p@(Program {})) = writeFile (fn ++ ".c") $ (render2C (RenderState [] ns) . pascal2C) p
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    toCFiles' (fn, (Unit _ interface implementation _ _)) = do
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        let (a, s) = runState (interface2C interface) (RenderState [] ns)
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        writeFile (fn ++ ".h") $ "#pragma once\n" ++ (render a)
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        writeFile (fn ++ ".c") $ (render2C s . implementation2C) implementation
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    render2C :: RenderState -> State RenderState Doc -> String
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    render2C a = render . flip evalState a
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usesFiles :: PascalUnit -> [String]
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usesFiles (Program _ (Implementation uses _) _) = "pas2cSystem" : uses2List uses
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usesFiles (Unit _ (Interface uses1 _) (Implementation uses2 _) _ _) = "pas2cSystem" : uses2List uses1 ++ uses2List uses2
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usesFiles (System {}) = []
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pascal2C :: PascalUnit -> State RenderState Doc
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pascal2C (Unit _ interface implementation init fin) =
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    liftM2 ($+$) (interface2C interface) (implementation2C implementation)
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pascal2C (Program _ implementation mainFunction) = do
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    impl <- implementation2C implementation
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    main <- tvar2C True 
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        (FunctionDeclaration (Identifier "main" BTInt) (SimpleType $ Identifier "int" BTInt) [] (Just (TypesAndVars [], mainFunction)))
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    return $ impl $+$ main
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interface2C :: Interface -> State RenderState Doc
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interface2C (Interface uses tvars) = liftM2 ($+$) (uses2C uses) (typesAndVars2C True tvars)
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implementation2C :: Implementation -> State RenderState Doc
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implementation2C (Implementation uses tvars) = liftM2 ($+$) (uses2C uses) (typesAndVars2C True tvars)
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typesAndVars2C :: Bool -> TypesAndVars -> State RenderState Doc
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typesAndVars2C b (TypesAndVars ts) = liftM vcat $ mapM (tvar2C b) ts
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uses2C :: Uses -> State RenderState Doc
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uses2C uses@(Uses unitIds) = do
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    mapM_ injectNamespace (Identifier "pas2cSystem" undefined : unitIds)
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    mapM_ (id2C True) unitIds
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    return $ vcat . map (\i -> text $ "#include \"" ++ i ++ ".h\"") $ uses2List uses
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    where
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    injectNamespace (Identifier i _) = do
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        getNS <- gets (flip Map.lookup . namespaces)
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        let f = flip (foldl (\a b -> b:a)) (fromMaybe [] (getNS i))
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        modify (\s -> s{currentScope = f $ currentScope s})
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uses2List :: Uses -> [String]
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uses2List (Uses ids) = map (\(Identifier i _) -> i) ids
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id2C :: Bool -> Identifier -> State RenderState Doc
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id2C True (Identifier i _) = do
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    modify (\s -> s{currentScope = (map toLower i, i) : currentScope s})
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    return $ text i
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id2C False (Identifier i _) = do
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    let i' = map toLower i
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    v <- gets $ find (\(a, _) -> a == i') . currentScope
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    --ns <- gets currentScope
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    if isNothing v then 
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        error $ "Not defined: '" ++ i' ++ "'"-- ++ show ns
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        else 
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        return . text . snd . fromJust $ v
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tvar2C :: Bool -> TypeVarDeclaration -> State RenderState Doc
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tvar2C _ (FunctionDeclaration name returnType params Nothing) = do
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    t <- type2C returnType 
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    p <- liftM hcat $ mapM (tvar2C False) params
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    n <- id2C True name
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    return $ t <+> n <> parens p <> text ";"
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tvar2C True (FunctionDeclaration name returnType params (Just (tvars, phrase))) = do
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    t <- type2C returnType 
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    p <- liftM hcat $ mapM (tvar2C False) params
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    ph <- liftM2 ($+$) (typesAndVars2C False tvars) (phrase2C' phrase)
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    n <- id2C True name
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    return $ 
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        t <+> n <> parens p
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        $+$
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        text "{" 
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        $+$ 
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        nest 4 ph
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        $+$
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        text "}"
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    where
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    phrase2C' (Phrases p) = liftM vcat $ mapM phrase2C p
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    phrase2C' p = phrase2C p
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tvar2C False (FunctionDeclaration (Identifier name _) _ _ _) = error $ "nested functions not allowed: " ++ name
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tvar2C _ (TypeDeclaration i' t) = do
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    tp <- type2C t
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    i <- id2C True i'
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    return $ text "type" <+> i <+> tp <> text ";"
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tvar2C _ (VarDeclaration isConst (ids, t) mInitExpr) = do
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    t' <- type2C t
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    i <- mapM (id2C True) ids
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    ie <- initExpr mInitExpr
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    return $ if isConst then text "const" else empty
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        <+> t'
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        <+> (hsep . punctuate (char ',') $ i)
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        <+> ie
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        <> text ";"
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    where
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    initExpr Nothing = return $ empty
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    initExpr (Just e) = liftM (text "=" <+>) (initExpr2C e)
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tvar2C f (OperatorDeclaration op _ ret params body) = 
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    tvar2C f (FunctionDeclaration (Identifier ("<op " ++ op ++ ">") Unknown) ret params body)
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initExpr2C :: InitExpression -> State RenderState Doc
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initExpr2C (InitBinOp op expr1 expr2) = do
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    e1 <- initExpr2C expr1
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    e2 <- initExpr2C expr2
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   206
    o <- op2C op
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   207
    return $ parens $ e1 <+> o <+> e2
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initExpr2C (InitNumber s) = return $ text s
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initExpr2C (InitFloat s) = return $ text s
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initExpr2C (InitHexNumber s) = return $ text "0x" <> (text . map toLower $ s)
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initExpr2C (InitString s) = return $ doubleQuotes $ text s 
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initExpr2C (InitReference i) = id2C False i
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initExpr2C _ = return $ text "<<expression>>"
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type2C :: TypeDecl -> State RenderState Doc
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type2C UnknownType = return $ text "void"
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type2C (String l) = return $ text $ "string" ++ show l
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type2C (SimpleType i) = id2C False i
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type2C (PointerTo (SimpleType i)) = liftM (<> text "*") $ id2C True i
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type2C (PointerTo t) = liftM (<> text "*") $ type2C t
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   222
type2C (RecordType tvs union) = do
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   223
    t <- mapM (tvar2C False) tvs
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    return $ text "{" $+$ (nest 4 . vcat $ t) $+$ text "}"
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type2C (RangeType r) = return $ text "<<range type>>"
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type2C (Sequence ids) = do
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   227
    mapM_ (id2C True) ids
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    return $ text "<<sequence type>>"
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type2C (ArrayDecl r t) = return $ text "<<array type>>"
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type2C (Set t) = return $ text "<<set>>"
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type2C (FunctionType returnType params) = return $ text "<<function>>"
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   232
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phrase2C :: Phrase -> State RenderState Doc
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   234
phrase2C (Phrases p) = do
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   235
    ps <- mapM phrase2C p
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   236
    return $ text "{" $+$ (nest 4 . vcat $ ps) $+$ text "}"
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phrase2C (ProcCall f@(FunCall {}) []) = liftM (<> semi) $ ref2C f
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   238
phrase2C (ProcCall ref params) = do
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   239
    r <- ref2C ref
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    ps <- mapM expr2C params
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   241
    return $ r <> parens (hsep . punctuate (char ',') $ ps) <> semi
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   242
phrase2C (IfThenElse (expr) phrase1 mphrase2) = do
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   243
    e <- expr2C expr
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   244
    p1 <- (phrase2C . wrapPhrase) phrase1
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   245
    el <- elsePart
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   246
    return $ 
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   247
        text "if" <> parens e $+$ p1 $+$ el
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   248
    where
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    elsePart | isNothing mphrase2 = return $ empty
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             | otherwise = liftM (text "else" $$) $ (phrase2C . wrapPhrase) (fromJust mphrase2)
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   251
phrase2C (Assignment ref expr) = do
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   252
    r <- ref2C ref 
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   253
    e <- expr2C expr
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   254
    return $
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   255
        r <> text " = " <> e <> semi
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   256
phrase2C (WhileCycle expr phrase) = do
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   257
    e <- expr2C expr
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   258
    p <- phrase2C $ wrapPhrase phrase
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   259
    return $ text "while" <> parens e $$ p
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phrase2C (SwitchCase expr cases mphrase) = do
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   261
    e <- expr2C expr
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    cs <- mapM case2C cases
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   263
    return $ 
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   264
        text "switch" <> parens e <> text "of" $+$ (nest 4 . vcat) cs
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   265
    where
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   266
    case2C :: ([InitExpression], Phrase) -> State RenderState Doc
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   267
    case2C (e, p) = do
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   268
        ie <- mapM initExpr2C e
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   269
        ph <- phrase2C p
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   270
        return $ 
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   271
            text "case" <+> parens (hsep . punctuate (char ',') $ ie) <> char ':' <> nest 4 (ph $+$ text "break;")
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   272
phrase2C (WithBlock ref p) = do
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   273
    r <- ref2C ref 
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    ph <- phrase2C $ wrapPhrase p
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    return $ text "namespace" <> parens r $$ ph
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   276
phrase2C (ForCycle i' e1' e2' p) = do
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   277
    i <- id2C False i'
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   278
    e1 <- expr2C e1'
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   279
    e2 <- expr2C e2'
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   280
    ph <- phrase2C (wrapPhrase p)
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   281
    return $ 
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   282
        text "for" <> (parens . hsep . punctuate (char ';') $ [i <+> text "=" <+> e1, i <+> text "<=" <+> e2, text "++" <> i])
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   283
        $$
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   284
        ph
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   285
phrase2C (RepeatCycle e' p') = do
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   286
    e <- expr2C e'
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   287
    p <- phrase2C (Phrases p')
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   288
    return $ text "do" <+> p <+> text "while" <> parens (text "!" <> parens e)
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   289
phrase2C NOP = return $ text ";"
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   290
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   291
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wrapPhrase p@(Phrases _) = p
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wrapPhrase p = Phrases [p]
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   295
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   296
expr2C :: Expression -> State RenderState Doc
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   297
expr2C (Expression s) = return $ text s
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   298
expr2C (BinOp op expr1 expr2) = do
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   299
    e1 <- expr2C expr1
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   300
    e2 <- expr2C expr2
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   301
    o <- op2C op
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    return $ parens $ e1 <+> o <+> e2
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expr2C (NumberLiteral s) = return $ text s
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expr2C (FloatLiteral s) = return $ text s
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expr2C (HexNumber s) = return $ text "0x" <> (text . map toLower $ s)
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expr2C (StringLiteral s) = return $ doubleQuotes $ text s 
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expr2C (Reference ref) = ref2C ref
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expr2C (PrefixOp op expr) = liftM2 (<+>) (op2C op) (expr2C expr)
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expr2C Null = return $ text "NULL"
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expr2C (BuiltInFunCall params ref) = do
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    r <- ref2C ref 
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    ps <- mapM expr2C params
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    return $ 
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        r <> parens (hsep . punctuate (char ',') $ ps)
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expr2C _ = return $ text "<<expression>>"
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ref2C :: Reference -> State RenderState Doc
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ref2C (ArrayElement exprs ref) = do
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    r <- ref2C ref 
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    es <- mapM expr2C exprs
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    return $ r <> (brackets . hcat) (punctuate comma es)
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ref2C (SimpleReference name) = id2C False name
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ref2C (RecordField (Dereference ref1) ref2) = do
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    r1 <- ref2C ref1 
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    r2 <- ref2C ref2
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    return $ 
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        r1 <> text "->" <> r2
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ref2C (RecordField ref1 ref2) = do
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    r1 <- ref2C ref1 
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    r2 <- ref2C ref2
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    return $ 
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        r1 <> text "." <> r2
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ref2C (Dereference ref) = liftM ((parens $ text "*") <>) $ ref2C ref
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ref2C (FunCall params ref) = do
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    r <- ref2C ref
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    ps <- mapM expr2C params
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    return $ 
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        r <> parens (hsep . punctuate (char ',') $ ps)
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ref2C (Address ref) = do
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    r <- ref2C ref
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    return $ text "&" <> parens r
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ref2C (TypeCast t' expr) = do
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    t <- id2C False t'
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    e <- expr2C expr
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    return $ parens t <> e
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ref2C (RefExpression expr) = expr2C expr
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op2C :: String -> State RenderState Doc
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op2C "or" = return $ text "|"
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op2C "and" = return $ text "&"
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op2C "not" = return $ text "!"
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op2C "xor" = return $ text "^"
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op2C "div" = return $ text "/"
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op2C "mod" = return $ text "%"
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op2C "shl" = return $ text "<<"
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op2C "shr" = return $ text ">>"
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op2C "<>" = return $ text "!="
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op2C "=" = return $ text "=="
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op2C a = return $ text a
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maybeVoid "" = "void"
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maybeVoid a = a