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|
-----------------------------------------------------------------------------
-- |
-- Module : Options
-- Copyright : 2006 Malcolm Wallace
-- Licence : LGPL
--
-- Maintainer : Malcolm Wallace <Malcolm.Wallace@cs.york.ac.uk>
-- Stability : experimental
-- Portability : All
--
-- This module deals with Cpphs options and parsing them
-----------------------------------------------------------------------------
module Language.Preprocessor.Cpphs.Options(CpphsOption(..), parseOption) where
import Maybe
data CpphsOption
= CpphsNoMacro
| CpphsNoLine
| CpphsText
| CpphsStrip
| CpphsAnsi
| CpphsLayout
| CpphsUnlit
| CpphsMacro (String,String)
| CpphsPath String
deriving (Eq, Show)
flags = [ ("--nomacro", CpphsNoMacro)
, ("--noline", CpphsNoLine)
, ("--text", CpphsText)
, ("--strip", CpphsStrip)
, ("--hashes", CpphsAnsi)
, ("--layout", CpphsLayout)
, ("--unlit", CpphsUnlit)
]
parseOption :: String -> Maybe CpphsOption
parseOption x | isJust a = Just $ fromJust a
where a = lookup x flags
parseOption ('-':'D':xs) = Just $ CpphsMacro (s, if null d then "1" else tail d)
where (s,d) = break (=='=') xs
parseOption ('-':'I':xs) = Just $ CpphsPath $ trail "/\\" xs
parseOption _ = Nothing
trail :: (Eq a) => [a] -> [a] -> [a]
trail xs = reverse . dropWhile (`elem`xs) . reverse
|
