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-- ParseRegexStr.hs
--
-- Author: Yoshikuni Jujo <PAF01143@nifty.ne.jp>
--
-- This file is part of regexpr library
--
-- regexpr is free software: you can redistribute it and/or modify
-- it under the terms of the GNU Lesser General Public License as
-- published by the Free Software Foundation, either version 3 of the
-- License, or any later version.
--
-- regexpr is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANGY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU Lesser General Public License for more details.
--
-- You should have received a copy of the GNU Lesser General Public
-- License along with this program. If not, see
-- <http://www.gnu.org/licenses/>.
module Hidden.ParseRegexStr (
RegexAction(..)
, parseRegexStr
) where
import Hidden.RegexPRTypes ( RegexAction(..),
RegexSrcParser, runRegexSrcParser,
getBR, modifyBR,
setMode, setModes, getModes,
isModeI, isModeM, isModeX )
import Text.ParserCombinators.MTLParse
( runParse, spot, token, tokens, mzero, mplus,
still, parseNot, endOfInput, MonadParse,
MonadPlus,
list, neList, greedyNeList, optional )
import Hidden.Tools ( isSymbol, ignoreCase, skipRet, (>..>), ifM,
applyIf, (&&&), headOrErr, modifyFst )
import Data.Char ( isAlphaNum, isDigit, isSpace )
import Data.Ix ( inRange )
import Hidden.SrcRegActList( selfTest, oneCharList, backSlashesList, plusesList,
parensesList, charClassList )
import Control.Applicative ((<$>))
parseRegexStr :: String -> [RegexAction]
parseRegexStr src =
fst . fst . headOrErr ("parse error: regex " ++ show src ++ " is uncorrect") .
runParse ( runRegexSrcParser parseRegexStrParser) . (,) [] $ src
parseRegexStrParser, parseTokensOr, parseTokens :: RegexSrcParser [RegexAction]
parseRegexStrParser = parseTokensOr >>= endOfInput
parseTokensOr = parseTokens
`mplus`
do { ra1 <- parseTokens; _ <- token '|'; ra2 <- parseTokensOr;
return [ RegexOr ra1 ra2 ] }
parseTokens = list parseTokenPlus
parseTokenPlus, parseToken :: RegexSrcParser RegexAction
parseTokenPlus = do ra <- parseToken
plus <- parsePluses plusesList `mplus` parseQuantifier
return $ plus ra
parseQuantifier :: RegexSrcParser (RegexAction -> RegexAction)
parseQuantifier
= do { _ <- token '{';
mn <- neList $ spot isDigit;
mx <- do { cma <- optional $ token ',';
case cma of
"" -> return Nothing
_ -> fmap Just $ list (spot isDigit) };
_ <- token '}';
nd <- fmap null $ optional (token '?');
return $ (if nd then Repeat else RepeatNotGreedy) (read mn) $
case mx of
Nothing -> Just $ read mn
Just "" -> Nothing
Just n -> Just $ read n }
parseToken
= ifM isModeX parseTokenX mzero
`mplus`
( isModeI >>= \ic ->
fmap (Select . applyIf ic ignoreCase . (==)) (spot selfTest) )
`mplus`
parseOpenBrace
`mplus`
ifM isModeM ( token '.' >> return (Select $ const True) ) mzero
`mplus`
fmap (Select . (==)) (token '\\' >> spot isSymbol)
`mplus`
parseBackReference
`mplus`
( fmap (not . null) ( token '[' >> optional (token '^') ) >>= \isNot ->
fmap (Select . applyIf isNot (not.)) (
parseCharList >>= skipRet (token ']')
) )
`mplus`
( getBR >>= \i -> fmap (Note i) $ token '(' >> modifyBR (+1) >> parseTokensOr
>>= skipRet (token ')') )
`mplus`
( tokens "(?" >> list parseMode >>= mapM_ (uncurry setMode) >> token ')'
>> return NopRegex )
`mplus`
( getModes >>= \preModes ->
fmap Parens $
tokens "(?" >> list parseMode >>= mapM_ (uncurry setMode) >> token ':' >>
parseTokensOr >>= skipRet (setModes preModes >> token ')')
)
`mplus`
parseOneChar oneCharList
`mplus`
parseBackSlashes backSlashesList
`mplus`
parseParenses parensesList
`mplus`
fmap Comment
( tokens "(?#" >> list (spot (/=')')) >>= skipRet (token ')') )
parseMode :: RegexSrcParser (Char, Bool)
parseMode =
fmap ( uncurry (flip (,)) . modifyFst null ) $
optional (token '-') >..> spot (`elem` "imx")
parseTokenX :: RegexSrcParser RegexAction
parseTokenX
= ( spot isSpace >> return NopRegex ) `mplus`
fmap Comment
( token '#' >> list (spot (/='\n')) >>=
skipRet (token '\n' `mplus` endOfInput '\n') )
parsePluses ::
[ (String, RegexAction -> RegexAction) ] ->
RegexSrcParser (RegexAction -> RegexAction)
parsePluses = concatMapParse (\(t, act) -> tokens t >> return act)
parseOneChar :: [ (Char, RegexAction) ] -> RegexSrcParser RegexAction
parseOneChar
= concatMapParse (\(t, act) -> token t >> return act)
parseBackSlashes :: [ (Char, RegexAction) ] -> RegexSrcParser RegexAction
parseBackSlashes
= concatMapParse (\(t, act) -> tokens ['\\', t] >> return act)
parseParenses ::
[ (String, [RegexAction] -> RegexAction) ] -> RegexSrcParser RegexAction
parseParenses
= concatMapParse ( \(t, act) ->
(fmap act $ tokens ('(':t) >> parseTokensOr >>= skipRet (token ')') ))
parseCharList :: RegexSrcParser (Char -> Bool)
parseCharList = do
modei <- isModeI
cl1 <- parseOne `mplus` concatMapParse ((>>= return . (==)) . token) "-]"
cl2 <- list $ parseOne `mplus` fmap (==) (token '^')
return $ applyIf modei ignoreCase $ or . zipWith ($) (cl1 : cl2) . repeat
where parseOne = fmap (==) parseChar `mplus` parseCharArea
`mplus` parseCharClass
parseChar = spot isAlphaNum `mplus`
( token '\\' >> spot isSymbol ) `mplus`
spot (selfTest &&& flip notElem "-]" ) `mplus`
spot (`elem` ".+$" ) `mplus`
( token '[' >>= skipRet (still $ parseNot ()
$ token ':') )
parseCharArea = fmap inRange $ (parseChar >>= skipRet (token '-')) >..> parseChar
parseCharClass = concatMapParse
(\(s, p) -> tokens ("[:"++s++":]") >> return p)
charClassList
concatMapParse :: MonadPlus m => (b -> m a) -> [b] -> m a
concatMapParse f = foldr (mplus . f) mzero
parseOpenBrace :: RegexSrcParser RegexAction
parseOpenBrace = do still $ parseNot () parseQuantifier
still $ parseNot () parseBackReference
ret <- token '{'
return $ Select (==ret)
parseBackReference :: RegexSrcParser RegexAction
parseBackReference = do
brace <- null <$> optional (token '{')
_ <- token '\\'
dgt <- greedyNeList (spot isDigit)
_ <- if brace then return ' ' else token '}'
return $ BackReference $ read dgt
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