[Haskell-cafe] Regex-applicative and Data.Text

[Konstantine Rybnikov]

I see. That's what I did exactly, thanks for the help.

On Wed, Feb 11, 2015 at 2:12 PM, Roman Cheplyaka <roma at ro-che.info> wrote:

> No, the token will still be Char. You'll need to unpack Text into [Char]
> beforehand, and pack the result back if appropriate.
>
> On 11/02/15 13:07, Konstantine Rybnikov wrote:
> > I just tried some regex-applicative and it's amazing! Very nice library,
> > thanks Roman!
> >
> > However, I can't figure out the best way to work with Data.Text.Text
> > instead of String. The token would be Text, I guess, but then it breaks
> > in composition, since type of `few anySym` would now return `[Text]`,
> > not `Text`.
> >
> > Am I understanding this correctly that intention is to in issue #8? [0]
> > Or is there a clever way to work with them today?
> >
> > Example code:
> >
> > {-# LANGUAGE OverloadedStrings #-}
> >
> > import qualified Data.Text as T
> > import Data.Text (Text)
> > import Text.Regex.Applicative
> >
> > main = do
> >   let input = "foo:\n--- blablabla\ttheend"
> >   let r1 = sym "foo:\n"
> >                       *> sym "--- " *> few anySym <* sym "\t" <* few
> anySym
> >             :: RE Text Text
> >
> >   putStrLn (show (input =~ r1))
> >
> > Error is something like (this is an error for a bit different code, but
> > should be very similar):
> >
> > Main.hs:14:40:
> >     Couldn't match type ‘[Text]’ with ‘Text’
> >     Expected type: RE Text Text
> >       Actual type: RE Text [Text]
> >     In the second argument of ‘(*>)’, namely ‘few anySym’
> >     In the first argument of ‘(<*)’, namely
> >       ‘few anySym *> sym "Actual stderr output differs from expected:"
> >        *> sym "--- "
> >        *> few anySym’
> >
> > Thanks!
> >
> > [0]: https://github.com/feuerbach/regex-applicative/issues/8
> >
> >
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> >
>
>
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