[Pkg-haskell-maintainers] Bug#753299: libghc-highlighting-kate-dev: Highlighting Ocaml fails

[John MacFarlane]

Update:  It seems that pcre-light is no longer being actively maintained
upstream.  pcre-regex-builtin is not in Debian.  I thought the solution
might be to add an option to highlighting-kate to use the regex-pcre library
(in debian as libghc-regex-pcre-dev).  However, this seems to have the same
problem:

Prelude Text.Regex.PCRE.ByteString Data.ByteString.UTF8> Left e <- compile (compUTF8 + compAnchored) 0 (fromString "[\\o{0370}-\\o{0377}")
Prelude Text.Regex.PCRE.ByteString Data.ByteString.UTF8> e
(11,"range out of order in character class")

Is the problem perhaps that the underlying C library pcre has not been
compiled with UTF8 support?

+++ John MacFarlane [Jul 18 14 16:53 ]:
>I'd tested before with pcre-regex-builtin, which worked.
>I recompiled with pcre-light, and got the failure you report.
>
>The problem can be exhibited in pcre-light:
>
>Prelude Text.Regex.PCRE.Light Data.ByteString.UTF8> match (compile
>(fromString
>"[\\o{0370}-\\o{0377}") [utf8,anchored]) (fromString "hi") []
>*** Exception: Text.Regex.PCRE.Light: Error in regex: range out of order
>in
>character class
>
>The unicode ranges seem to be confusing it, even with 'utf8' set.
>
>Submitted an issue upstream:
>https://github.com/Daniel-Diaz/pcre-light/issues/1
>
>In the mean time, I suggest that debian packagers use pcre-regex-builtin
>instead (though perhaps there was a reason for using pcre-light?).
>
>+++ Samuel Hym [Jul 01 14 18:06 ]:
>>Hi John,
>>
>>>Are you certain that the version you are using in GHCI is 0.5.8.2,
>>>and not an older version (perhaps from your user database)?
>>
>>I rechecked, using the same version of the package but on a 
>>different machine, different arch, just in case. But still with 
>>debian-built packages, and with the same result.
>>
>>Here is what ghci has to say, with the full versions of the modules used:
>>
>>GHCi, version 7.6.3: http://www.haskell.org/ghc/  :? for help
>>Loading package ghc-prim ... linking ... done.
>>Loading package integer-gmp ... linking ... done.
>>Loading package base ... linking ... done.
>>Prelude> :m +Text.Highlighting.Kate
>>Prelude Text.Highlighting.Kate> highlightAs "ocaml" "a"
>>Loading package array-0.4.0.1 ... linking ... done.
>>Loading package deepseq-1.3.0.1 ... linking ... done.
>>Loading package containers-0.5.0.0 ... linking ... done.
>>Loading package bytestring-0.10.0.2 ... linking ... done.
>>Loading package transformers-0.3.0.0 ... linking ... done.
>>Loading package mtl-2.1.2 ... linking ... done.
>>Loading package text-0.11.3.1 ... linking ... done.
>>Loading package parsec-3.1.3 ... linking ... done.
>>Loading package blaze-builder-0.3.3.2 ... linking ... done.
>>Loading package blaze-markup-0.5.1.6 ... linking ... done.
>>Loading package blaze-html-0.6.1.2 ... linking ... done.
>>Loading package pcre-light-0.4 ... linking ... done.
>>Loading package utf8-string-0.3.7 ... linking ... done.
>>Loading package highlighting-kate-0.5.8.2 ... linking ... done.
>>[*** Exception: Text.Regex.PCRE.Light: Error in regex: range out of 
>>order in character class
>>
>>You think something else might be to blame in the module stack?
>>Do you know if there is a way to ask pcre-light to be somewhat more 
>>informative about the regex producing the issue?
>>
>>By the way, many thanks for pandoc!
>>
>>Best regards
>>Samuel