author | unc0rr |
Tue, 07 Feb 2012 22:18:44 +0400 | |
changeset 6649 | 7f78e8a6db69 |
parent 6635 | c2fa29fe2a58 |
child 6653 | d45b6dbd2ad6 |
permissions | -rw-r--r-- |
6273 | 1 |
module Pas2C where |
2 |
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3 |
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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type Record = (String, (String, BaseType)) |
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data RenderState = RenderState |
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{ |
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currentScope :: [Record], |
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lastType :: BaseType, |
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namespaces :: Map.Map String [Record] |
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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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34 |
where |
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printLn = liftIO . hPutStrLn stderr |
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print = liftIO . hPutStr stderr |
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initState = Map.empty |
1ef4192aa80d
- Parse unions, sets, function type, packed arrays and some more imporvements to the parser. Now it parses uVariable, uConsts and even SDLh.pas
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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 |
1ef4192aa80d
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unless processed $ do |
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print ("Preprocessing '" ++ fileName ++ ".pas'... ") |
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fc' <- liftIO |
1ef4192aa80d
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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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Countless imporvements to the parser and countless help to the parser in sources.
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(Left a) -> do |
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modify (Map.insert fileName (System [])) |
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Countless imporvements to the parser and countless help to the parser in sources.
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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 |
1ef4192aa80d
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case ptree of |
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(Left a) -> do |
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liftIO $ writeFile "preprocess.out" fc |
1ef4192aa80d
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printLn $ show a ++ "\nsee preprocess.out for preprocessed source" |
1ef4192aa80d
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fail "stop" |
1ef4192aa80d
- Parse unions, sets, function type, packed arrays and some more imporvements to the parser. Now it parses uVariable, uConsts and even SDLh.pas
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(Right a) -> do |
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printLn "ok" |
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modify (Map.insert fileName a) |
1ef4192aa80d
- Parse unions, sets, function type, packed arrays and some more imporvements to the parser. Now it parses uVariable, uConsts and even SDLh.pas
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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 nss = Map.map (toNamespace nss) units |
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mapM_ (toCFiles nss) u |
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where |
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toNamespace :: Map.Map String [Record] -> PascalUnit -> [Record] |
c2fa29fe2a58
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toNamespace nss (System tvs) = |
c2fa29fe2a58
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currentScope $ execState (mapM_ (tvar2C True) tvs) (RenderState [] BTUnknown nss) |
c2fa29fe2a58
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toNamespace _ (Program {}) = [] |
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Some progress, still can't find the source of bad behavior
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toNamespace nss (Unit _ interface _ _ _) = |
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currentScope $ execState (interface2C interface) (RenderState [] BTUnknown nss) |
c2fa29fe2a58
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toCFiles :: Map.Map String [Record] -> (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 initialState . pascal2C) p |
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toCFiles' (fn, (Unit _ interface implementation _ _)) = do |
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let (a, s) = runState (interface2C interface) initialState |
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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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initialState = RenderState [] BTUnknown ns |
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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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- Parse unions, sets, function type, packed arrays and some more imporvements to the parser. Now it parses uVariable, uConsts and even SDLh.pas
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98 |
|
1ef4192aa80d
- Parse unions, sets, function type, packed arrays and some more imporvements to the parser. Now it parses uVariable, uConsts and even SDLh.pas
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99 |
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6512 | 100 |
pascal2C :: PascalUnit -> State RenderState Doc |
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pascal2C (Unit _ interface implementation init fin) = |
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102 |
liftM2 ($+$) (interface2C interface) (implementation2C implementation) |
33180b479efa
Start converting into monadic code using Reader monad (will be used to store information about namespace)
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103 |
|
33180b479efa
Start converting into monadic code using Reader monad (will be used to store information about namespace)
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104 |
pascal2C (Program _ implementation mainFunction) = do |
33180b479efa
Start converting into monadic code using Reader monad (will be used to store information about namespace)
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105 |
impl <- implementation2C implementation |
33180b479efa
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main <- tvar2C True |
33180b479efa
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107 |
(FunctionDeclaration (Identifier "main" BTInt) (SimpleType $ Identifier "int" BTInt) [] (Just (TypesAndVars [], mainFunction))) |
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return $ impl $+$ main |
33180b479efa
Start converting into monadic code using Reader monad (will be used to store information about namespace)
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109 |
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6467 | 110 |
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111 |
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6512 | 112 |
interface2C :: Interface -> State RenderState Doc |
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interface2C (Interface uses tvars) = liftM2 ($+$) (uses2C uses) (typesAndVars2C True tvars) |
6273 | 114 |
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6512 | 115 |
implementation2C :: Implementation -> State RenderState Doc |
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implementation2C (Implementation uses tvars) = liftM2 ($+$) (uses2C uses) (typesAndVars2C True tvars) |
6273 | 117 |
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118 |
||
6512 | 119 |
typesAndVars2C :: Bool -> TypesAndVars -> State RenderState Doc |
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120 |
typesAndVars2C b (TypesAndVars ts) = liftM vcat $ mapM (tvar2C b) ts |
6273 | 121 |
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6512 | 122 |
uses2C :: Uses -> State RenderState Doc |
6516 | 123 |
uses2C uses@(Uses unitIds) = do |
124 |
mapM_ injectNamespace (Identifier "pas2cSystem" undefined : unitIds) |
|
6552 | 125 |
mapM_ (id2C True) unitIds |
6516 | 126 |
return $ vcat . map (\i -> text $ "#include \"" ++ i ++ ".h\"") $ uses2List uses |
127 |
where |
|
6517 | 128 |
injectNamespace (Identifier i _) = do |
6516 | 129 |
getNS <- gets (flip Map.lookup . namespaces) |
130 |
let f = flip (foldl (\a b -> b:a)) (fromMaybe [] (getNS i)) |
|
131 |
modify (\s -> s{currentScope = f $ currentScope s}) |
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132 |
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- Parse unions, sets, function type, packed arrays and some more imporvements to the parser. Now it parses uVariable, uConsts and even SDLh.pas
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133 |
uses2List :: Uses -> [String] |
6489 | 134 |
uses2List (Uses ids) = map (\(Identifier i _) -> i) ids |
6273 | 135 |
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6509 | 136 |
|
6512 | 137 |
id2C :: Bool -> Identifier -> State RenderState Doc |
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id2C True (Identifier i t) = do |
139 |
modify (\s -> s{currentScope = (map toLower i, (i, t)) : currentScope s}) |
|
6512 | 140 |
return $ text i |
6618 | 141 |
id2C False (Identifier i t) = do |
6512 | 142 |
let i' = map toLower i |
6516 | 143 |
v <- gets $ find (\(a, _) -> a == i') . currentScope |
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144 |
ns <- gets currentScope |
6618 | 145 |
modify (\s -> s{lastType = t}) |
6512 | 146 |
if isNothing v then |
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147 |
error $ "Not defined: '" ++ i' ++ "'\n" ++ show ns |
6512 | 148 |
else |
6618 | 149 |
return . text . fst . snd . fromJust $ v |
6512 | 150 |
|
6618 | 151 |
id2CTyped :: BaseType -> Identifier -> State RenderState Doc |
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Further work on propagating types. Now it hopefully works fully, just need to annotate namespace with types first.
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152 |
id2CTyped BTUnknown i = do |
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153 |
ns <- gets currentScope |
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Fix a bug with type declaration trying to resolve type being declared
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154 |
error $ "id2CTyped: type BTUnknown for " ++ show i ++ "\n" ++ show ns |
6618 | 155 |
id2CTyped bt (Identifier i _) = id2C True (Identifier i bt) |
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Further work on propagating types. Now it hopefully works fully, just need to annotate namespace with types first.
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156 |
|
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Further work on propagating types. Now it hopefully works fully, just need to annotate namespace with types first.
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157 |
|
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Further work on propagating types. Now it hopefully works fully, just need to annotate namespace with types first.
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158 |
resolveType :: TypeDecl -> State RenderState BaseType |
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Further work on propagating types. Now it hopefully works fully, just need to annotate namespace with types first.
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159 |
resolveType st@(SimpleType (Identifier i _)) = do |
a447993f2ad7
Further work on propagating types. Now it hopefully works fully, just need to annotate namespace with types first.
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160 |
let i' = map toLower i |
a447993f2ad7
Further work on propagating types. Now it hopefully works fully, just need to annotate namespace with types first.
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parents:
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161 |
v <- gets $ find (\(a, _) -> a == i') . currentScope |
a447993f2ad7
Further work on propagating types. Now it hopefully works fully, just need to annotate namespace with types first.
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162 |
if isJust v then return . snd . snd $ fromJust v else return $ f i' |
a447993f2ad7
Further work on propagating types. Now it hopefully works fully, just need to annotate namespace with types first.
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163 |
where |
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Further work on propagating types. Now it hopefully works fully, just need to annotate namespace with types first.
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164 |
f "integer" = BTInt |
a447993f2ad7
Further work on propagating types. Now it hopefully works fully, just need to annotate namespace with types first.
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165 |
f "pointer" = BTPointerTo BTVoid |
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166 |
f "boolean" = BTBool |
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167 |
f "float" = BTFloat |
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168 |
f "char" = BTChar |
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169 |
f "string" = BTString |
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170 |
f _ = error $ "Unknown system type: " ++ show st |
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171 |
resolveType (PointerTo t) = liftM BTPointerTo $ resolveType t |
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|
172 |
resolveType (RecordType tv mtvs) = do |
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|
173 |
tvs <- mapM f (concat $ tv : fromMaybe [] mtvs) |
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|
174 |
return . BTRecord . concat $ tvs |
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|
175 |
where |
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|
176 |
f :: TypeVarDeclaration -> State RenderState [(String, BaseType)] |
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|
177 |
f (VarDeclaration _ (ids, td) _) = mapM (\(Identifier i _) -> liftM ((,) i) $ resolveType td) ids |
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|
178 |
resolveType (ArrayDecl (Just _) t) = liftM (BTArray BTInt) $ resolveType t |
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|
179 |
resolveType (ArrayDecl Nothing t) = liftM (BTArray BTInt) $ resolveType t |
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180 |
resolveType (FunctionType _ _) = return BTFunction |
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|
181 |
resolveType (DeriveType _) = return BTInt |
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|
182 |
resolveType (String _) = return BTString |
6626
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|
183 |
--resolveType UnknownType = return BTUnknown |
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|
184 |
resolveType a = error $ "resolveType: " ++ show a |
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|
185 |
|
6512 | 186 |
|
187 |
tvar2C :: Bool -> TypeVarDeclaration -> State RenderState Doc |
|
6509 | 188 |
tvar2C _ (FunctionDeclaration name returnType params Nothing) = do |
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|
189 |
t <- type2C returnType |
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|
190 |
p <- liftM hcat $ mapM (tvar2C False) params |
6509 | 191 |
n <- id2C True name |
192 |
return $ t <+> n <> parens p <> text ";" |
|
6517 | 193 |
|
6509 | 194 |
tvar2C True (FunctionDeclaration name returnType params (Just (tvars, phrase))) = do |
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|
195 |
t <- type2C returnType |
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196 |
p <- liftM hcat $ mapM (tvar2C False) params |
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|
197 |
ph <- liftM2 ($+$) (typesAndVars2C False tvars) (phrase2C' phrase) |
6509 | 198 |
n <- id2C True name |
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|
199 |
return $ |
6509 | 200 |
t <+> n <> parens p |
6425
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|
201 |
$+$ |
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|
202 |
text "{" |
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|
203 |
$+$ |
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|
204 |
nest 4 ph |
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|
205 |
$+$ |
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|
206 |
text "}" |
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|
207 |
where |
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|
208 |
phrase2C' (Phrases p) = liftM vcat $ mapM phrase2C p |
6425
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changeset
|
209 |
phrase2C' p = phrase2C p |
6517 | 210 |
|
6489 | 211 |
tvar2C False (FunctionDeclaration (Identifier name _) _ _ _) = error $ "nested functions not allowed: " ++ name |
6618 | 212 |
|
213 |
tvar2C _ td@(TypeDeclaration i' t) = do |
|
6649
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|
214 |
tb <- resolveType t |
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|
215 |
i <- id2CTyped tb i' |
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|
216 |
tp <- type2C t |
6516 | 217 |
return $ text "type" <+> i <+> tp <> text ";" |
6517 | 218 |
|
6509 | 219 |
tvar2C _ (VarDeclaration isConst (ids, t) mInitExpr) = do |
220 |
t' <- type2C t |
|
6626
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|
221 |
tb <- resolveType t |
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|
222 |
i <- mapM (id2CTyped tb) ids |
6509 | 223 |
ie <- initExpr mInitExpr |
224 |
return $ if isConst then text "const" else empty |
|
225 |
<+> t' |
|
226 |
<+> (hsep . punctuate (char ',') $ i) |
|
227 |
<+> ie |
|
228 |
<> text ";" |
|
6355 | 229 |
where |
6509 | 230 |
initExpr Nothing = return $ empty |
231 |
initExpr (Just e) = liftM (text "=" <+>) (initExpr2C e) |
|
6517 | 232 |
|
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|
233 |
tvar2C f (OperatorDeclaration op _ ret params body) = |
6618 | 234 |
tvar2C f (FunctionDeclaration (Identifier ("<op " ++ op ++ ">") BTUnknown) ret params body) |
6355 | 235 |
|
6517 | 236 |
|
6512 | 237 |
initExpr2C :: InitExpression -> State RenderState Doc |
6509 | 238 |
initExpr2C (InitBinOp op expr1 expr2) = do |
239 |
e1 <- initExpr2C expr1 |
|
240 |
e2 <- initExpr2C expr2 |
|
241 |
o <- op2C op |
|
242 |
return $ parens $ e1 <+> o <+> e2 |
|
243 |
initExpr2C (InitNumber s) = return $ text s |
|
244 |
initExpr2C (InitFloat s) = return $ text s |
|
245 |
initExpr2C (InitHexNumber s) = return $ text "0x" <> (text . map toLower $ s) |
|
246 |
initExpr2C (InitString s) = return $ doubleQuotes $ text s |
|
247 |
initExpr2C (InitReference i) = id2C False i |
|
248 |
initExpr2C _ = return $ text "<<expression>>" |
|
6391 | 249 |
|
250 |
||
6512 | 251 |
type2C :: TypeDecl -> State RenderState Doc |
6509 | 252 |
type2C UnknownType = return $ text "void" |
253 |
type2C (String l) = return $ text $ "string" ++ show l |
|
6514 | 254 |
type2C (SimpleType i) = id2C False i |
6520 | 255 |
type2C (PointerTo (SimpleType i)) = liftM (<> text "*") $ id2C True i |
6509 | 256 |
type2C (PointerTo t) = liftM (<> text "*") $ type2C t |
257 |
type2C (RecordType tvs union) = do |
|
258 |
t <- mapM (tvar2C False) tvs |
|
259 |
return $ text "{" $+$ (nest 4 . vcat $ t) $+$ text "}" |
|
260 |
type2C (RangeType r) = return $ text "<<range type>>" |
|
6520 | 261 |
type2C (Sequence ids) = do |
262 |
mapM_ (id2C True) ids |
|
263 |
return $ text "<<sequence type>>" |
|
6509 | 264 |
type2C (ArrayDecl r t) = return $ text "<<array type>>" |
265 |
type2C (Set t) = return $ text "<<set>>" |
|
266 |
type2C (FunctionType returnType params) = return $ text "<<function>>" |
|
6626
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|
267 |
type2C (DeriveType _) = return $ text "<<type derived from constant literal>>" |
6273 | 268 |
|
6512 | 269 |
phrase2C :: Phrase -> State RenderState Doc |
6509 | 270 |
phrase2C (Phrases p) = do |
271 |
ps <- mapM phrase2C p |
|
272 |
return $ text "{" $+$ (nest 4 . vcat $ ps) $+$ text "}" |
|
273 |
phrase2C (ProcCall f@(FunCall {}) []) = liftM (<> semi) $ ref2C f |
|
274 |
phrase2C (ProcCall ref params) = do |
|
275 |
r <- ref2C ref |
|
276 |
ps <- mapM expr2C params |
|
277 |
return $ r <> parens (hsep . punctuate (char ',') $ ps) <> semi |
|
278 |
phrase2C (IfThenElse (expr) phrase1 mphrase2) = do |
|
279 |
e <- expr2C expr |
|
280 |
p1 <- (phrase2C . wrapPhrase) phrase1 |
|
281 |
el <- elsePart |
|
282 |
return $ |
|
283 |
text "if" <> parens e $+$ p1 $+$ el |
|
6273 | 284 |
where |
6509 | 285 |
elsePart | isNothing mphrase2 = return $ empty |
286 |
| otherwise = liftM (text "else" $$) $ (phrase2C . wrapPhrase) (fromJust mphrase2) |
|
287 |
phrase2C (Assignment ref expr) = do |
|
288 |
r <- ref2C ref |
|
289 |
e <- expr2C expr |
|
290 |
return $ |
|
291 |
r <> text " = " <> e <> semi |
|
292 |
phrase2C (WhileCycle expr phrase) = do |
|
293 |
e <- expr2C expr |
|
294 |
p <- phrase2C $ wrapPhrase phrase |
|
295 |
return $ text "while" <> parens e $$ p |
|
296 |
phrase2C (SwitchCase expr cases mphrase) = do |
|
297 |
e <- expr2C expr |
|
298 |
cs <- mapM case2C cases |
|
299 |
return $ |
|
300 |
text "switch" <> parens e <> text "of" $+$ (nest 4 . vcat) cs |
|
6273 | 301 |
where |
6512 | 302 |
case2C :: ([InitExpression], Phrase) -> State RenderState Doc |
6509 | 303 |
case2C (e, p) = do |
304 |
ie <- mapM initExpr2C e |
|
305 |
ph <- phrase2C p |
|
306 |
return $ |
|
307 |
text "case" <+> parens (hsep . punctuate (char ',') $ ie) <> char ':' <> nest 4 (ph $+$ text "break;") |
|
308 |
phrase2C (WithBlock ref p) = do |
|
309 |
r <- ref2C ref |
|
310 |
ph <- phrase2C $ wrapPhrase p |
|
311 |
return $ text "namespace" <> parens r $$ ph |
|
312 |
phrase2C (ForCycle i' e1' e2' p) = do |
|
313 |
i <- id2C False i' |
|
314 |
e1 <- expr2C e1' |
|
315 |
e2 <- expr2C e2' |
|
316 |
ph <- phrase2C (wrapPhrase p) |
|
317 |
return $ |
|
318 |
text "for" <> (parens . hsep . punctuate (char ';') $ [i <+> text "=" <+> e1, i <+> text "<=" <+> e2, text "++" <> i]) |
|
319 |
$$ |
|
320 |
ph |
|
321 |
phrase2C (RepeatCycle e' p') = do |
|
322 |
e <- expr2C e' |
|
323 |
p <- phrase2C (Phrases p') |
|
324 |
return $ text "do" <+> p <+> text "while" <> parens (text "!" <> parens e) |
|
325 |
phrase2C NOP = return $ text ";" |
|
6355 | 326 |
|
6273 | 327 |
|
6307 | 328 |
wrapPhrase p@(Phrases _) = p |
329 |
wrapPhrase p = Phrases [p] |
|
6273 | 330 |
|
6355 | 331 |
|
6512 | 332 |
expr2C :: Expression -> State RenderState Doc |
6509 | 333 |
expr2C (Expression s) = return $ text s |
334 |
expr2C (BinOp op expr1 expr2) = do |
|
335 |
e1 <- expr2C expr1 |
|
336 |
e2 <- expr2C expr2 |
|
337 |
o <- op2C op |
|
338 |
return $ parens $ e1 <+> o <+> e2 |
|
339 |
expr2C (NumberLiteral s) = return $ text s |
|
340 |
expr2C (FloatLiteral s) = return $ text s |
|
341 |
expr2C (HexNumber s) = return $ text "0x" <> (text . map toLower $ s) |
|
342 |
expr2C (StringLiteral s) = return $ doubleQuotes $ text s |
|
6277 | 343 |
expr2C (Reference ref) = ref2C ref |
6509 | 344 |
expr2C (PrefixOp op expr) = liftM2 (<+>) (op2C op) (expr2C expr) |
345 |
expr2C Null = return $ text "NULL" |
|
346 |
expr2C (BuiltInFunCall params ref) = do |
|
347 |
r <- ref2C ref |
|
348 |
ps <- mapM expr2C params |
|
349 |
return $ |
|
350 |
r <> parens (hsep . punctuate (char ',') $ ps) |
|
351 |
expr2C _ = return $ text "<<expression>>" |
|
6273 | 352 |
|
6307 | 353 |
|
6512 | 354 |
ref2C :: Reference -> State RenderState Doc |
6509 | 355 |
ref2C (ArrayElement exprs ref) = do |
356 |
r <- ref2C ref |
|
357 |
es <- mapM expr2C exprs |
|
358 |
return $ r <> (brackets . hcat) (punctuate comma es) |
|
359 |
ref2C (SimpleReference name) = id2C False name |
|
360 |
ref2C (RecordField (Dereference ref1) ref2) = do |
|
361 |
r1 <- ref2C ref1 |
|
362 |
r2 <- ref2C ref2 |
|
363 |
return $ |
|
364 |
r1 <> text "->" <> r2 |
|
6618 | 365 |
ref2C rf@(RecordField ref1 ref2) = do |
366 |
r1 <- ref2C ref1 |
|
367 |
t <- gets lastType |
|
368 |
case t of |
|
369 |
r@(BTRecord _) -> error $ show r |
|
370 |
a -> error $ "dereferencing from " ++ show a ++ " - " ++ show rf |
|
6509 | 371 |
r2 <- ref2C ref2 |
372 |
return $ |
|
373 |
r1 <> text "." <> r2 |
|
374 |
ref2C (Dereference ref) = liftM ((parens $ text "*") <>) $ ref2C ref |
|
375 |
ref2C (FunCall params ref) = do |
|
376 |
r <- ref2C ref |
|
377 |
ps <- mapM expr2C params |
|
378 |
return $ |
|
379 |
r <> parens (hsep . punctuate (char ',') $ ps) |
|
380 |
ref2C (Address ref) = do |
|
381 |
r <- ref2C ref |
|
382 |
return $ text "&" <> parens r |
|
383 |
ref2C (TypeCast t' expr) = do |
|
384 |
t <- id2C False t' |
|
385 |
e <- expr2C expr |
|
386 |
return $ parens t <> e |
|
6467 | 387 |
ref2C (RefExpression expr) = expr2C expr |
6355 | 388 |
|
6509 | 389 |
|
6512 | 390 |
op2C :: String -> State RenderState Doc |
6509 | 391 |
op2C "or" = return $ text "|" |
392 |
op2C "and" = return $ text "&" |
|
393 |
op2C "not" = return $ text "!" |
|
394 |
op2C "xor" = return $ text "^" |
|
395 |
op2C "div" = return $ text "/" |
|
396 |
op2C "mod" = return $ text "%" |
|
397 |
op2C "shl" = return $ text "<<" |
|
398 |
op2C "shr" = return $ text ">>" |
|
399 |
op2C "<>" = return $ text "!=" |
|
400 |
op2C "=" = return $ text "==" |
|
401 |
op2C a = return $ text a |
|
6273 | 402 |
|
403 |
maybeVoid "" = "void" |
|
404 |
maybeVoid a = a |