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81 lines
2.7 KiB
Haskell
81 lines
2.7 KiB
Haskell
{-
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Copyright 2012-2015 Vidar Holen
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This file is part of ShellCheck.
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http://www.vidarholen.net/contents/shellcheck
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ShellCheck is free software: you can redistribute it and/or modify
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it under the terms of the GNU 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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ShellCheck 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 General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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-}
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{-# LANGUAGE FlexibleContexts #-}
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-- Basically Text.Regex based on regex-tdfa instead of the buggy regex-posix.
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module ShellCheck.Regex where
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import Data.List
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import Data.Maybe
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import Control.Monad
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import Text.Regex.TDFA
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-- Precompile the regex
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mkRegex :: String -> Regex
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mkRegex str =
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let make :: RegexMaker Regex CompOption ExecOption String => String -> Regex
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make = makeRegex
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in
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make str
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-- Does the regex match?
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matches :: String -> Regex -> Bool
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matches = flip match
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-- Get all subgroups of the first match
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matchRegex :: Regex -> String -> Maybe [String]
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matchRegex re str = do
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(_, _, _, groups) <- matchM re str :: Maybe (String,String,String,[String])
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return groups
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-- Get all full matches
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matchAllStrings :: Regex -> String -> [String]
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matchAllStrings re = unfoldr f
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where
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f :: String -> Maybe (String, String)
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f str = do
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(_, match, rest, _) <- matchM re str :: Maybe (String, String, String, [String])
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return (match, rest)
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-- Get all subgroups from all matches
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matchAllSubgroups :: Regex -> String -> [[String]]
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matchAllSubgroups re = unfoldr f
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where
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f :: String -> Maybe ([String], String)
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f str = do
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(_, _, rest, groups) <- matchM re str :: Maybe (String, String, String, [String])
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return (groups, rest)
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-- Replace regex in input with string
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subRegex :: Regex -> String -> String -> String
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subRegex re input replacement = f input
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where
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f str = fromMaybe str $ do
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(before, match, after) <- matchM re str :: Maybe (String, String, String)
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when (null match) $ error ("Internal error: substituted empty in " ++ str)
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return $ before ++ replacement ++ f after
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-- Split a string based on a regex.
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splitOn :: String -> Regex -> [String]
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splitOn input re =
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case matchM re input :: Maybe (String, String, String) of
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Just (before, match, after) -> before : after `splitOn` re
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Nothing -> [input]
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