module Pas2C where
import Text.PrettyPrint.HughesPJ
import Data.Maybe
import Data.Char
import Text.Parsec.Prim hiding (State)
import Control.Monad.State
import System.IO
import System.Directory
import Control.Monad.IO.Class
import PascalPreprocessor
import Control.Exception
import System.IO.Error
import qualified Data.Map as Map
import Data.List (find)
import PascalParser
import PascalUnitSyntaxTree
type Record = (String, (String, BaseType))
data RenderState = RenderState
{
currentScope :: [Record],
lastType :: BaseType,
namespaces :: Map.Map String [Record]
}
pas2C :: String -> IO ()
pas2C fn = do
setCurrentDirectory "../hedgewars/"
s <- flip execStateT initState $ f fn
renderCFiles s
where
printLn = liftIO . hPutStrLn stderr
print = liftIO . hPutStr stderr
initState = Map.empty
f :: String -> StateT (Map.Map String PascalUnit) IO ()
f fileName = do
processed <- gets $ Map.member fileName
unless processed $ do
print ("Preprocessing '" ++ fileName ++ ".pas'... ")
fc' <- liftIO
$ tryJust (guard . isDoesNotExistError)
$ preprocess (fileName ++ ".pas")
case fc' of
(Left a) -> do
modify (Map.insert fileName (System []))
printLn "doesn't exist"
(Right fc) -> do
print "ok, parsing... "
let ptree = parse pascalUnit fileName fc
case ptree of
(Left a) -> do
liftIO $ writeFile "preprocess.out" fc
printLn $ show a ++ "\nsee preprocess.out for preprocessed source"
fail "stop"
(Right a) -> do
printLn "ok"
modify (Map.insert fileName a)
mapM_ f (usesFiles a)
renderCFiles :: Map.Map String PascalUnit -> IO ()
renderCFiles units = do
let u = Map.toList units
let nss = Map.map (toNamespace nss) units
mapM_ (toCFiles nss) u
where
toNamespace :: Map.Map String [Record] -> PascalUnit -> [Record]
toNamespace nss (System tvs) =
currentScope $ execState (mapM_ (tvar2C True) tvs) (RenderState [] BTUnknown nss)
toNamespace _ (Program {}) = []
toNamespace nss (Unit _ interface _ _ _) =
currentScope $ execState (interface2C interface) (RenderState [] BTUnknown nss)
toCFiles :: Map.Map String [Record] -> (String, PascalUnit) -> IO ()
toCFiles _ (_, System _) = return ()
toCFiles ns p@(fn, pu) = do
hPutStrLn stderr $ "Rendering '" ++ fn ++ "'..."
toCFiles' p
where
toCFiles' (fn, p@(Program {})) = writeFile (fn ++ ".c") $ (render2C initialState . pascal2C) p
toCFiles' (fn, (Unit _ interface implementation _ _)) = do
let (a, s) = runState (interface2C interface) initialState
writeFile (fn ++ ".h") $ "#pragma once\n" ++ (render a)
writeFile (fn ++ ".c") $ (render2C s . implementation2C) implementation
initialState = RenderState [] BTUnknown ns
render2C :: RenderState -> State RenderState Doc -> String
render2C a = render . flip evalState a
usesFiles :: PascalUnit -> [String]
usesFiles (Program _ (Implementation uses _) _) = "pas2cSystem" : uses2List uses
usesFiles (Unit _ (Interface uses1 _) (Implementation uses2 _) _ _) = "pas2cSystem" : uses2List uses1 ++ uses2List uses2
usesFiles (System {}) = []
pascal2C :: PascalUnit -> State RenderState Doc
pascal2C (Unit _ interface implementation init fin) =
liftM2 ($+$) (interface2C interface) (implementation2C implementation)
pascal2C (Program _ implementation mainFunction) = do
impl <- implementation2C implementation
main <- tvar2C True
(FunctionDeclaration (Identifier "main" BTInt) (SimpleType $ Identifier "int" BTInt) [] (Just (TypesAndVars [], mainFunction)))
return $ impl $+$ main
interface2C :: Interface -> State RenderState Doc
interface2C (Interface uses tvars) = liftM2 ($+$) (uses2C uses) (typesAndVars2C True tvars)
implementation2C :: Implementation -> State RenderState Doc
implementation2C (Implementation uses tvars) = liftM2 ($+$) (uses2C uses) (typesAndVars2C True tvars)
typesAndVars2C :: Bool -> TypesAndVars -> State RenderState Doc
typesAndVars2C b (TypesAndVars ts) = liftM vcat $ mapM (tvar2C b) ts
uses2C :: Uses -> State RenderState Doc
uses2C uses@(Uses unitIds) = do
mapM_ injectNamespace (Identifier "pas2cSystem" undefined : unitIds)
mapM_ (id2C True) unitIds
return $ vcat . map (\i -> text $ "#include \"" ++ i ++ ".h\"") $ uses2List uses
where
injectNamespace (Identifier i _) = do
getNS <- gets (flip Map.lookup . namespaces)
let f = flip (foldl (\a b -> b:a)) (fromMaybe [] (getNS i))
modify (\s -> s{currentScope = f $ currentScope s})
uses2List :: Uses -> [String]
uses2List (Uses ids) = map (\(Identifier i _) -> i) ids
id2C :: Bool -> Identifier -> State RenderState Doc
id2C True (Identifier i t) = do
modify (\s -> s{currentScope = (map toLower i, (i, t)) : currentScope s})
return $ text i
id2C False (Identifier i t) = do
let i' = map toLower i
v <- gets $ find (\(a, _) -> a == i') . currentScope
ns <- gets currentScope
modify (\s -> s{lastType = t})
if isNothing v then
error $ "Not defined: '" ++ i' ++ "'\n" ++ show ns
else
return . text . fst . snd . fromJust $ v
id2CTyped :: TypeDecl -> Identifier -> State RenderState Doc
id2CTyped t (Identifier i _) = do
tb <- resolveType t
id2C True (Identifier i tb)
{--id2CTyped BTUnknown i = do
ns <- gets currentScope
error $ "id2CTyped: type BTUnknown for " ++ show i ++ "\n" ++ show ns
id2CTyped bt (Identifier i _) = id2C True (Identifier i bt)--}
resolveType :: TypeDecl -> State RenderState BaseType
resolveType st@(SimpleType (Identifier i _)) = do
let i' = map toLower i
v <- gets $ find (\(a, _) -> a == i') . currentScope
if isJust v then return . snd . snd $ fromJust v else return $ f i'
where
f "integer" = BTInt
f "pointer" = BTPointerTo BTVoid
f "boolean" = BTBool
f "float" = BTFloat
f "char" = BTChar
f "string" = BTString
f _ = error $ "Unknown system type: " ++ show st
resolveType (PointerTo t) = return $ BTPointerTo BTUnknown -- can't resolveType for t here
resolveType (RecordType tv mtvs) = do
tvs <- mapM f (concat $ tv : fromMaybe [] mtvs)
return . BTRecord . concat $ tvs
where
f :: TypeVarDeclaration -> State RenderState [(String, BaseType)]
f (VarDeclaration _ (ids, td) _) = mapM (\(Identifier i _) -> liftM ((,) i) $ resolveType td) ids
resolveType (ArrayDecl (Just _) t) = liftM (BTArray BTInt) $ resolveType t
resolveType (ArrayDecl Nothing t) = liftM (BTArray BTInt) $ resolveType t
resolveType (FunctionType _ _) = return BTFunction
resolveType (DeriveType _) = return BTInt
resolveType (String _) = return BTString
resolveType (Sequence ids) = return $ BTEnum $ map (\(Identifier i _) -> map toLower i) ids
resolveType (RangeType _) = return $ BTInt
resolveType (Set t) = liftM BTSet $ resolveType t
--resolveType UnknownType = return BTUnknown
resolveType a = error $ "resolveType: " ++ show a
tvar2C :: Bool -> TypeVarDeclaration -> State RenderState Doc
tvar2C _ (FunctionDeclaration name returnType params Nothing) = do
t <- type2C returnType
p <- liftM hcat $ mapM (tvar2C False) params
n <- id2C True name
return $ t <+> n <> parens p <> text ";"
tvar2C True (FunctionDeclaration name returnType params (Just (tvars, phrase))) = do
t <- type2C returnType
p <- liftM hcat $ mapM (tvar2C False) params
ph <- liftM2 ($+$) (typesAndVars2C False tvars) (phrase2C' phrase)
n <- id2C True name
return $
t <+> n <> parens p
$+$
text "{"
$+$
nest 4 ph
$+$
text "}"
where
phrase2C' (Phrases p) = liftM vcat $ mapM phrase2C p
phrase2C' p = phrase2C p
tvar2C False (FunctionDeclaration (Identifier name _) _ _ _) = error $ "nested functions not allowed: " ++ name
tvar2C _ td@(TypeDeclaration i' t) = do
i <- id2CTyped t i'
tp <- type2C t
return $ text "type" <+> i <+> tp <> text ";"
tvar2C _ (VarDeclaration isConst (ids, t) mInitExpr) = do
t' <- type2C t
i <- mapM (id2CTyped t) ids
ie <- initExpr mInitExpr
return $ if isConst then text "const" else empty
<+> t'
<+> (hsep . punctuate (char ',') $ i)
<+> ie
<> text ";"
where
initExpr Nothing = return $ empty
initExpr (Just e) = liftM (text "=" <+>) (initExpr2C e)
tvar2C f (OperatorDeclaration op _ ret params body) =
tvar2C f (FunctionDeclaration (Identifier ("<op " ++ op ++ ">") BTUnknown) ret params body)
initExpr2C :: InitExpression -> State RenderState Doc
initExpr2C (InitBinOp op expr1 expr2) = do
e1 <- initExpr2C expr1
e2 <- initExpr2C expr2
o <- op2C op
return $ parens $ e1 <+> o <+> e2
initExpr2C (InitNumber s) = return $ text s
initExpr2C (InitFloat s) = return $ text s
initExpr2C (InitHexNumber s) = return $ text "0x" <> (text . map toLower $ s)
initExpr2C (InitString s) = return $ doubleQuotes $ text s
initExpr2C (InitReference i) = id2C False i
initExpr2C _ = return $ text "<<expression>>"
type2C :: TypeDecl -> State RenderState Doc
type2C UnknownType = return $ text "void"
type2C (String l) = return $ text $ "string" ++ show l
type2C (SimpleType i) = id2C False i
type2C (PointerTo (SimpleType i)) = liftM (<> text "*") $ id2C True i
type2C (PointerTo t) = liftM (<> text "*") $ type2C t
type2C (RecordType tvs union) = do
t <- mapM (tvar2C False) tvs
return $ text "{" $+$ (nest 4 . vcat $ t) $+$ text "}"
type2C (RangeType r) = return $ text "<<range type>>"
type2C (Sequence ids) = do
mapM_ (id2C True) ids
return $ text "<<sequence type>>"
type2C (ArrayDecl r t) = return $ text "<<array type>>"
type2C (Set t) = return $ text "<<set>>"
type2C (FunctionType returnType params) = return $ text "<<function>>"
type2C (DeriveType _) = return $ text "<<type derived from constant literal>>"
phrase2C :: Phrase -> State RenderState Doc
phrase2C (Phrases p) = do
ps <- mapM phrase2C p
return $ text "{" $+$ (nest 4 . vcat $ ps) $+$ text "}"
phrase2C (ProcCall f@(FunCall {}) []) = liftM (<> semi) $ ref2C f
phrase2C (ProcCall ref params) = do
r <- ref2C ref
ps <- mapM expr2C params
return $ r <> parens (hsep . punctuate (char ',') $ ps) <> semi
phrase2C (IfThenElse (expr) phrase1 mphrase2) = do
e <- expr2C expr
p1 <- (phrase2C . wrapPhrase) phrase1
el <- elsePart
return $
text "if" <> parens e $+$ p1 $+$ el
where
elsePart | isNothing mphrase2 = return $ empty
| otherwise = liftM (text "else" $$) $ (phrase2C . wrapPhrase) (fromJust mphrase2)
phrase2C (Assignment ref expr) = do
r <- ref2C ref
e <- expr2C expr
return $
r <> text " = " <> e <> semi
phrase2C (WhileCycle expr phrase) = do
e <- expr2C expr
p <- phrase2C $ wrapPhrase phrase
return $ text "while" <> parens e $$ p
phrase2C (SwitchCase expr cases mphrase) = do
e <- expr2C expr
cs <- mapM case2C cases
return $
text "switch" <> parens e <> text "of" $+$ (nest 4 . vcat) cs
where
case2C :: ([InitExpression], Phrase) -> State RenderState Doc
case2C (e, p) = do
ie <- mapM initExpr2C e
ph <- phrase2C p
return $
text "case" <+> parens (hsep . punctuate (char ',') $ ie) <> char ':' <> nest 4 (ph $+$ text "break;")
phrase2C (WithBlock ref p) = do
r <- ref2C ref
ph <- phrase2C $ wrapPhrase p
return $ text "namespace" <> parens r $$ ph
phrase2C (ForCycle i' e1' e2' p) = do
i <- id2C False i'
e1 <- expr2C e1'
e2 <- expr2C e2'
ph <- phrase2C (wrapPhrase p)
return $
text "for" <> (parens . hsep . punctuate (char ';') $ [i <+> text "=" <+> e1, i <+> text "<=" <+> e2, text "++" <> i])
$$
ph
phrase2C (RepeatCycle e' p') = do
e <- expr2C e'
p <- phrase2C (Phrases p')
return $ text "do" <+> p <+> text "while" <> parens (text "!" <> parens e)
phrase2C NOP = return $ text ";"
wrapPhrase p@(Phrases _) = p
wrapPhrase p = Phrases [p]
expr2C :: Expression -> State RenderState Doc
expr2C (Expression s) = return $ text s
expr2C (BinOp op expr1 expr2) = do
e1 <- expr2C expr1
e2 <- expr2C expr2
o <- op2C op
return $ parens $ e1 <+> o <+> e2
expr2C (NumberLiteral s) = return $ text s
expr2C (FloatLiteral s) = return $ text s
expr2C (HexNumber s) = return $ text "0x" <> (text . map toLower $ s)
expr2C (StringLiteral s) = return $ doubleQuotes $ text s
expr2C (Reference ref) = ref2C ref
expr2C (PrefixOp op expr) = liftM2 (<+>) (op2C op) (expr2C expr)
expr2C Null = return $ text "NULL"
expr2C (BuiltInFunCall params ref) = do
r <- ref2C ref
ps <- mapM expr2C params
return $
r <> parens (hsep . punctuate (char ',') $ ps)
expr2C _ = return $ text "<<expression>>"
ref2C :: Reference -> State RenderState Doc
ref2C (ArrayElement exprs ref) = do
r <- ref2C ref
es <- mapM expr2C exprs
return $ r <> (brackets . hcat) (punctuate comma es)
ref2C (SimpleReference name) = id2C False name
ref2C (RecordField (Dereference ref1) ref2) = do
r1 <- ref2C ref1
r2 <- ref2C ref2
return $
r1 <> text "->" <> r2
ref2C rf@(RecordField ref1 ref2) = do
r1 <- ref2C ref1
t <- gets lastType
case t of
r@(BTRecord _) -> error $ show r
a -> error $ "dereferencing from " ++ show a ++ " - " ++ show rf
r2 <- ref2C ref2
return $
r1 <> text "." <> r2
ref2C (Dereference ref) = liftM ((parens $ text "*") <>) $ ref2C ref
ref2C (FunCall params ref) = do
r <- ref2C ref
ps <- mapM expr2C params
return $
r <> parens (hsep . punctuate (char ',') $ ps)
ref2C (Address ref) = do
r <- ref2C ref
return $ text "&" <> parens r
ref2C (TypeCast t' expr) = do
t <- id2C False t'
e <- expr2C expr
return $ parens t <> e
ref2C (RefExpression expr) = expr2C expr
op2C :: String -> State RenderState Doc
op2C "or" = return $ text "|"
op2C "and" = return $ text "&"
op2C "not" = return $ text "!"
op2C "xor" = return $ text "^"
op2C "div" = return $ text "/"
op2C "mod" = return $ text "%"
op2C "shl" = return $ text "<<"
op2C "shr" = return $ text ">>"
op2C "<>" = return $ text "!="
op2C "=" = return $ text "=="
op2C a = return $ text a
maybeVoid "" = "void"
maybeVoid a = a