[Haskell-cafe] Hugs vs GHC (again) was: Re: Some
dimitry at golubovsky.org
Mon Jan 10 20:48:41 EST 2005
-------- Original Message --------
Subject: Re: [Haskell-cafe] Hugs vs GHC (again) was: Re: Some random newbiequestions
Date: Mon, 10 Jan 2005 20:47:26 -0500
From: Dimitry Golubovsky <dimitry at golubovsky.org>
To: Marcin 'Qrczak' Kowalczyk <qrczak at knm.org.pl>
References: <3429668D0E777A499EE74A7952C382D102F30BF6 at EUR-MSG-01.europe.corp.microsoft.com> <877jmmv2zz.fsf at qrnik.zagroda> <59BACBDC-6273-11D9-8389-000A95E8B0DA at etu.upmc.fr>
<87acrgssem.fsf at qrnik.zagroda>
Let me add a column for Hugs (summarized by looking at recent checkout
from CVS, contained im several C ahd Haskell files):
|Sebastien's| Marcin's | Hugs
alnum | L* N* | L* N* | L*, M*, N* <1>
alpha | L* | L* | L* <1>
cntrl | Cc | Cc Zl Zp | c < ' ' || c >= '\DEL' && c <= '\x9f'
digit | N* | Nd | c >= '0' && c <= '9'
lower | Ll | Ll | Ll <1>
punct | P* | P* | P*
upper | Lu | Lt Lu | Lu Lt <1>
blank | Z* \t\n\r | Z*(except| ' ' \t\n\r\f\v U+00A0
<1>: for characters outside Latin1 range. For Latin1 characters (0 to
255), there is a lookup table defined as
"unsigned char charTable[NUM_LAT1_CHARS];"
I also like Ketil's idea about defining predicates like isUpper or isSpace
in multiple files, quoting this:
>> It's not obvious what the predicates should really mean, e.g. should
>> isDigit and isHexDigit include non-ASCII digits or should isSpace
>> include non-breaking space characters.
> I think perhaps the answer is all of the above. The functions could
> be defined in multiple modules, so that 'ASCII.isSpace' would match
> the "normal" space character only, while 'Unicode.isSpace' could match
> all the weird and wonderful stuff in the standard.
So there might be a bunch of (perhaps autogenerated, from localedef
files) modules for each locale/encoding, like ISO8859_1 or KOI_8. These
modules might be imported into applications as needed. Also there would
be one module autogenerated from the Unicode data files.
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