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--
-- Haddock - A Haskell Documentation Tool
--
-- (c) The University of Glasgow 2001-2002
-- (c) Simon Marlow 2002
--
module HaddockUtil (
-- * Misc utilities
nameOfQName, collectNames, declBinders, declMainBinder, splitTyConApp,
restrictTo,
-- * Filename utilities
basename, dirname, splitFilename3,
isPathSeparator, pathSeparator,
-- * Miscellaneous utilities
die, dieMsg, mapSnd, mapMaybeM
) where
import HsSyn
import List ( intersect )
import IO ( hPutStr, stderr )
import System
-- -----------------------------------------------------------------------------
-- Some Utilities
nameOfQName (Qual _ n) = n
nameOfQName (UnQual n) = n
collectNames :: [HsDecl] -> [HsName]
collectNames ds = concat (map declBinders ds)
declMainBinder :: HsDecl -> Maybe HsName
declMainBinder d =
case d of
HsTypeDecl _ n _ _ -> Just n
HsDataDecl _ _ n _ cons _ -> Just n
HsNewTypeDecl _ _ n _ _ _ -> Just n
HsClassDecl _ qt _ decls -> Just (exQtNm qt)
HsTypeSig _ [n] _ -> Just n
HsTypeSig _ ns _ -> error "declMainBinder"
HsForeignImport _ _ _ _ n _ -> Just n
_ -> Nothing
declBinders :: HsDecl -> [HsName]
declBinders d =
case d of
HsTypeDecl _ n _ _ -> [n]
HsDataDecl _ _ n _ cons _ -> n : concat (map conDeclBinders cons)
HsNewTypeDecl _ _ n _ con _ -> n : conDeclBinders con
HsClassDecl _ qt _ decls -> exQtNm qt : collectNames decls
HsTypeSig _ ns _ -> ns
HsForeignImport _ _ _ _ n _ -> [n]
_ -> []
conDeclBinders (HsConDecl _ n _ _ _ _) = [n]
conDeclBinders (HsRecDecl _ n _ _ fields _) =
n : concat (map fieldDeclBinders fields)
fieldDeclBinders (HsFieldDecl ns _ _) = ns
exQtNm (HsForAllType _ _ t) = nameOfQName (fst (splitTyConApp t))
exQtNm t = nameOfQName (fst (splitTyConApp t))
splitTyConApp :: HsType -> (HsQName,[HsType])
splitTyConApp t = split t []
where
split :: HsType -> [HsType] -> (HsQName,[HsType])
split (HsTyApp t u) ts = split t (u:ts)
split (HsTyCon t) ts = (t,ts)
split _ _ = error "splitTyConApp"
-- ---------------------------------------------------------------------------
-- Making abstract declarations
restrictTo :: [HsName] -> HsDecl -> HsDecl
restrictTo names decl = case decl of
HsDataDecl loc ctxt n xs cons drv ->
HsDataDecl loc ctxt n xs (restrictCons names cons) drv
HsNewTypeDecl loc ctxt n xs con drv ->
HsDataDecl loc ctxt n xs (restrictCons names [con]) drv
HsClassDecl loc qt fds decls ->
HsClassDecl loc qt fds (restrictDecls names decls)
_ -> decl
restrictCons :: [HsName] -> [HsConDecl] -> [HsConDecl]
restrictCons names decls = filter keep decls
where keep (HsConDecl _ n _ _ _ _) = n `elem` names
keep (HsRecDecl _ n _ _ _ _) = n `elem` names
-- ToDo: records not right
restrictDecls :: [HsName] -> [HsDecl] -> [HsDecl]
restrictDecls names decls = filter keep decls
where keep d = not (null (declBinders d `intersect` names))
-- ToDo: not really correct
-- -----------------------------------------------------------------------------
-- Filename mangling functions stolen from GHC's main/DriverUtil.lhs.
type Suffix = String
splitFilename :: String -> (String,Suffix)
splitFilename f = split_longest_prefix f (=='.')
basename :: String -> String
basename f = base where (_dir, base, _suff) = splitFilename3 f
dirname :: String -> String
dirname f = dir where (dir, _base, _suff) = splitFilename3 f
-- "foo/bar/xyzzy.ext" -> ("foo/bar", "xyzzy", ".ext")
splitFilename3 :: String -> (String,String,Suffix)
splitFilename3 str
= let (dir, rest) = split_longest_prefix str isPathSeparator
(name, ext) = splitFilename rest
real_dir | null dir = "."
| otherwise = dir
in (real_dir, name, ext)
split_longest_prefix :: String -> (Char -> Bool) -> (String,String)
split_longest_prefix s pred
= case pre of
[] -> ([], reverse suf)
(_:pre) -> (reverse pre, reverse suf)
where (suf,pre) = break pred (reverse s)
pathSeparator :: Char
#ifdef __WIN32__
pathSeparator = '\\'
#else
pathSeparator = '/'
#endif
isPathSeparator :: Char -> Bool
isPathSeparator ch =
#ifdef mingw32_TARGET_OS
ch == '/' || ch == '\\'
#else
ch == '/'
#endif
-----------------------------------------------------------------------------
-- misc.
die :: String -> IO a
die s = hPutStr stderr s >> exitWith (ExitFailure 1)
dieMsg :: String -> IO a
dieMsg s = getProgName >>= \prog -> die (prog ++ ": " ++ s)
mapSnd f [] = []
mapSnd f ((x,y):xs) = (x,f y) : mapSnd f xs
mapMaybeM :: Monad m => (a -> m b) -> Maybe a -> m (Maybe b)
mapMaybeM f Nothing = return Nothing
mapMaybeM f (Just a) = f a >>= return . Just
|
