[Haskell-cafe] Hugs vs GHC (again) was: Re: Some random newbiequestions

[Marcin 'Qrczak' Kowalczyk]

Jérémy Bobbio <jeremy.bobbio at etu.upmc.fr> writes:

>> Once this is agreed, it would be easy to make scripts which generate
>> C code from UnicodeData.txt tables from Unicode. I think table-driven
>> predicates and toUpper/toLower should better be implemented in C;
>> Haskell is not good at static constant tables with numbers.
>
> Sebastien Carlier already wrote this for hOp, see :
> http://etudiants.insia.org/~jbobbio/hOp/Gen_wctype.hs

And I've done a similar thing for my language Kogut some time ago:
http://cvs.sourceforge.net/viewcvs.py/kokogut/kokogut/runtime/make-char-tables.in?view=markup
http://cvs.sourceforge.net/viewcvs.py/kokogut/kokogut/lib/Core/Kokogut/Characters.ko?view=markup

Let's see how these separately developed interpretations of predicates differ
(mine also have different names and there are a few more):

        |Sebastien's| mine
 -------+-----------+----------
  alnum | L* N*     | L* N*
  alpha | L*        | L*
  cntrl | Cc        | Cc Zl Zp
  digit | N*        | Nd
  lower | Ll        | Ll
  punct | P*        | P*
  upper | Lu        | Lt Lu
  blank | Z* \t\n\r | Z*(except U+00A0 U+2007 U+202F) \t\n\v\f\r U+0085

Note that the interpretation of "digit" differs from both C and
Haskell 98 which specify it to be ASCII-only. Actually I have
ASCII-only variants of IsDigit parametrized by the number base.

-- 
   __("<         Marcin Kowalczyk
   \__/       qrczak at knm.org.pl
    ^^     http://qrnik.knm.org.pl/~qrczak/