56 lines
1.9 KiB
Haskell
56 lines
1.9 KiB
Haskell
-- ghc-mod: Making Haskell development *more* fun
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-- Copyright (C) 2015 Nikolay Yakimov <root@livid.pp.ru>
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--
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-- This program is free software: you can redistribute it and/or modify
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-- it under the terms of the GNU Affero General Public License as published by
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-- the Free Software Foundation, either version 3 of the License, or
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-- (at your option) any later version.
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--
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-- This program is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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-- GNU Affero General Public License for more details.
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--
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-- You should have received a copy of the GNU Affero General Public License
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-- along with this program. If not, see <http://www.gnu.org/licenses/>.
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module GHCMod.Options.ShellEscape (parseCmdLine) where
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import Data.Char
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import Data.Maybe
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isQuote :: Char -> Bool
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isQuote = (==) '"'
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isEscapeChar :: Char -> Bool
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isEscapeChar = (==) '\\'
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isEscapable :: Char -> Bool
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isEscapable c = any ($ c) [isSpace, isQuote, isEscapeChar]
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go :: String -> String -> [String] -> Maybe Char -> [String]
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-- result
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go [] curarg accargs _ = reverse $ reverse curarg : accargs
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-- escaped character
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go (esc:c:cl) curarg accargs quote
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| isEscapeChar esc
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= if isEscapable c
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then go cl (c:curarg) accargs quote
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else go (c:cl) (esc:curarg) accargs quote
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-- quote character -- opens quotes
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go (c:cl) curarg accargs Nothing
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| isQuote c = go cl curarg accargs (Just c)
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-- close quotes
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go (c:cl) curarg accargs (Just q)
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| c == q = go cl curarg accargs Nothing
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go (c:cl) curarg accargs quotes
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-- space separates argumetns outside quotes
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| isSpace c && isNothing quotes
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= if null curarg
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then go cl curarg accargs quotes
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else go cl [] (reverse curarg : accargs) quotes
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-- general character
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| otherwise = go cl (c:curarg) accargs quotes
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parseCmdLine :: String -> [String]
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parseCmdLine comline = go comline [] [] Nothing
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