{-|
Module      :  Text.Regex.TDFA.Text
Copyright   :  Chris Kuklewicz 2007-2009, shelarcy 2012
License     :  BSD-style (see the file LICENSE)

This modules provides 'RegexMaker' and 'RegexLike' instances for using
'Text' with the TDFA backend ("Text.Regex.TDFA.NewDFA.Engine" and
"Text.Regex.TDFA.NewDFA.Tester").

This exports instances of the high level API and the medium level
API of 'compile','execute', and 'regexec'.

@since 1.3.1
-}
module Text.Regex.TDFA.Text(
  Regex
 ,CompOption
 ,ExecOption
 ,compile
 ,execute
 ,regexec
 ) where

import Data.Array((!),elems)
import qualified Data.Text as T(Text,unpack)

import Text.Regex.Base(RegexLike(..),RegexMaker(..),Extract(..),MatchArray,RegexContext(..))
import Text.Regex.Base.Impl(polymatch,polymatchM)
import Text.Regex.TDFA.ReadRegex(parseRegex)
import Text.Regex.TDFA.String() -- piggyback on RegexMaker for String
import Text.Regex.TDFA.TDFA(patternToRegex)
import Text.Regex.TDFA.Common(Regex(..),CompOption,ExecOption(captureGroups),Position)

import Data.Maybe(listToMaybe)
import Text.Regex.TDFA.NewDFA.Uncons(Uncons)
import qualified Text.Regex.TDFA.NewDFA.Engine as Engine(execMatch)
import qualified Text.Regex.TDFA.NewDFA.Tester as Tester(matchTest)

-- | @since 1.3.1
instance RegexContext Regex T.Text T.Text where
  match :: Regex -> Text -> Text
match = Regex -> Text -> Text
forall a b. RegexLike a b => a -> b -> b
polymatch
  matchM :: forall (m :: * -> *). MonadFail m => Regex -> Text -> m Text
matchM = Regex -> Text -> m Text
forall a b (m :: * -> *).
(RegexLike a b, MonadFail m) =>
a -> b -> m b
polymatchM

-- | @since 1.3.1
instance RegexMaker Regex CompOption ExecOption T.Text where
  makeRegexOptsM :: forall (m :: * -> *).
MonadFail m =>
CompOption -> ExecOption -> Text -> m Regex
makeRegexOptsM CompOption
c ExecOption
e Text
source = CompOption -> ExecOption -> String -> m Regex
forall regex compOpt execOpt source (m :: * -> *).
(RegexMaker regex compOpt execOpt source, MonadFail m) =>
compOpt -> execOpt -> source -> m regex
makeRegexOptsM CompOption
c ExecOption
e (Text -> String
T.unpack Text
source)

-- | @since 1.3.1
{-# SPECIALIZE execMatch :: Regex -> Position -> Char -> T.Text -> [MatchArray] #-}
execMatch :: Uncons text => Regex -> Position -> Char -> text -> [MatchArray]
execMatch :: forall text.
Uncons text =>
Regex -> Position -> Char -> text -> [MatchArray]
execMatch = Regex -> Position -> Char -> text -> [MatchArray]
forall text.
Uncons text =>
Regex -> Position -> Char -> text -> [MatchArray]
Engine.execMatch

-- | @since 1.3.1
{-# SPECIALIZE myMatchTest :: Regex -> T.Text -> Bool #-}
myMatchTest :: Uncons text => Regex -> text -> Bool
myMatchTest :: forall text. Uncons text => Regex -> text -> Bool
myMatchTest = Regex -> text -> Bool
forall text. Uncons text => Regex -> text -> Bool
Tester.matchTest

-- | @since 1.3.1
instance RegexLike Regex T.Text where
  matchOnce :: Regex -> Text -> Maybe MatchArray
matchOnce Regex
r Text
s = [MatchArray] -> Maybe MatchArray
forall a. [a] -> Maybe a
listToMaybe (Regex -> Text -> [MatchArray]
forall regex source.
RegexLike regex source =>
regex -> source -> [MatchArray]
matchAll Regex
r Text
s)
  matchAll :: Regex -> Text -> [MatchArray]
matchAll Regex
r Text
s = Regex -> Position -> Char -> Text -> [MatchArray]
forall text.
Uncons text =>
Regex -> Position -> Char -> text -> [MatchArray]
execMatch Regex
r Position
0 Char
'\n' Text
s
  matchCount :: Regex -> Text -> Position
matchCount Regex
r Text
s = [MatchArray] -> Position
forall (t :: * -> *) a. Foldable t => t a -> Position
length (Regex -> Text -> [MatchArray]
forall regex source.
RegexLike regex source =>
regex -> source -> [MatchArray]
matchAll Regex
r' Text
s)
    where r' :: Regex
r' = Regex
r { regex_execOptions :: ExecOption
regex_execOptions = (Regex -> ExecOption
regex_execOptions Regex
r) {captureGroups :: Bool
captureGroups = Bool
False} }
  matchTest :: Regex -> Text -> Bool
matchTest = Regex -> Text -> Bool
forall text. Uncons text => Regex -> text -> Bool
myMatchTest
  matchOnceText :: Regex -> Text -> Maybe (Text, MatchText Text, Text)
matchOnceText Regex
regex Text
source =
    (MatchArray -> (Text, MatchText Text, Text))
-> Maybe MatchArray -> Maybe (Text, MatchText Text, Text)
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap (\MatchArray
ma -> let (Position
o,Position
l) = MatchArray
maMatchArray -> Position -> (Position, Position)
forall i e. Ix i => Array i e -> i -> e
!Position
0
                 in (Position -> Text -> Text
forall source. Extract source => Position -> source -> source
before Position
o Text
source
                    ,((Position, Position) -> (Text, (Position, Position)))
-> MatchArray -> MatchText Text
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap (\(Position, Position)
ol -> ((Position, Position) -> Text -> Text
forall source.
Extract source =>
(Position, Position) -> source -> source
extract (Position, Position)
ol Text
source,(Position, Position)
ol)) MatchArray
ma
                    ,Position -> Text -> Text
forall source. Extract source => Position -> source -> source
after (Position
oPosition -> Position -> Position
forall a. Num a => a -> a -> a
+Position
l) Text
source))
         (Regex -> Text -> Maybe MatchArray
forall regex source.
RegexLike regex source =>
regex -> source -> Maybe MatchArray
matchOnce Regex
regex Text
source)
  matchAllText :: Regex -> Text -> [MatchText Text]
matchAllText Regex
regex Text
source =
    (MatchArray -> MatchText Text) -> [MatchArray] -> [MatchText Text]
forall a b. (a -> b) -> [a] -> [b]
map (((Position, Position) -> (Text, (Position, Position)))
-> MatchArray -> MatchText Text
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap (\(Position, Position)
ol -> ((Position, Position) -> Text -> Text
forall source.
Extract source =>
(Position, Position) -> source -> source
extract (Position, Position)
ol Text
source,(Position, Position)
ol)))
        (Regex -> Text -> [MatchArray]
forall regex source.
RegexLike regex source =>
regex -> source -> [MatchArray]
matchAll Regex
regex Text
source)

-- | @since 1.3.1
compile :: CompOption -- ^ Flags (summed together)
        -> ExecOption -- ^ Flags (summed together)
        -> T.Text -- ^ The regular expression to compile
        -> Either String Regex -- ^ Returns: the compiled regular expression
compile :: CompOption -> ExecOption -> Text -> Either String Regex
compile CompOption
compOpt ExecOption
execOpt Text
txt =
  case String -> Either ParseError (Pattern, (Position, DoPa))
parseRegex (Text -> String
T.unpack Text
txt) of
    Left ParseError
err -> String -> Either String Regex
forall a b. a -> Either a b
Left (String
"parseRegex for Text.Regex.TDFA.Text failed:"String -> String -> String
forall a. [a] -> [a] -> [a]
++ParseError -> String
forall a. Show a => a -> String
show ParseError
err)
    Right (Pattern, (Position, DoPa))
pattern -> Regex -> Either String Regex
forall a b. b -> Either a b
Right ((Pattern, (Position, DoPa)) -> CompOption -> ExecOption -> Regex
patternToRegex (Pattern, (Position, DoPa))
pattern CompOption
compOpt ExecOption
execOpt)

-- | @since 1.3.1
execute :: Regex      -- ^ Compiled regular expression
        -> T.Text -- ^ Text to match against
        -> Either String (Maybe MatchArray)
execute :: Regex -> Text -> Either String (Maybe MatchArray)
execute Regex
r Text
txt = Maybe MatchArray -> Either String (Maybe MatchArray)
forall a b. b -> Either a b
Right (Regex -> Text -> Maybe MatchArray
forall regex source.
RegexLike regex source =>
regex -> source -> Maybe MatchArray
matchOnce Regex
r Text
txt)

-- | @since 1.3.1
regexec :: Regex      -- ^ Compiled regular expression
        -> T.Text -- ^ Text to match against
        -> Either String (Maybe (T.Text, T.Text, T.Text, [T.Text]))
regexec :: Regex -> Text -> Either String (Maybe (Text, Text, Text, [Text]))
regexec Regex
r Text
txt =
  case Regex -> Text -> Maybe (Text, MatchText Text, Text)
forall regex source.
RegexLike regex source =>
regex -> source -> Maybe (source, MatchText source, source)
matchOnceText Regex
r Text
txt of
    Maybe (Text, MatchText Text, Text)
Nothing -> Maybe (Text, Text, Text, [Text])
-> Either String (Maybe (Text, Text, Text, [Text]))
forall a b. b -> Either a b
Right (Maybe (Text, Text, Text, [Text])
forall a. Maybe a
Nothing)
    Just (Text
pre,MatchText Text
mt,Text
post) ->
      let main :: Text
main = (Text, (Position, Position)) -> Text
forall a b. (a, b) -> a
fst (MatchText Text
mtMatchText Text -> Position -> (Text, (Position, Position))
forall i e. Ix i => Array i e -> i -> e
!Position
0)
          rest :: [Text]
rest = ((Text, (Position, Position)) -> Text)
-> [(Text, (Position, Position))] -> [Text]
forall a b. (a -> b) -> [a] -> [b]
map (Text, (Position, Position)) -> Text
forall a b. (a, b) -> a
fst ([(Text, (Position, Position))] -> [(Text, (Position, Position))]
forall a. [a] -> [a]
tail (MatchText Text -> [(Text, (Position, Position))]
forall i e. Array i e -> [e]
elems MatchText Text
mt)) -- will be []
      in Maybe (Text, Text, Text, [Text])
-> Either String (Maybe (Text, Text, Text, [Text]))
forall a b. b -> Either a b
Right ((Text, Text, Text, [Text]) -> Maybe (Text, Text, Text, [Text])
forall a. a -> Maybe a
Just (Text
pre,Text
main,Text
post,[Text]
rest))