[Cuis] About adding a Unicode handling porting layer

[H. Hirzel]

Ken

Having a comparison of a specification/implementation of a simple
Unicode layer in another language is helpful.

https://code.google.com/p/chibi-scheme/source/browse/lib/scheme/char.sld  [1]

So my aim is at doing something similar in the sense that I want to
leave Cuis 4.1 more or less as is (maybe minor corrections) and then
have an Add-On for more Unicode support.

Thank you

--Hannes



[1]
(define-library (scheme char)
(import (scheme base))
(cond-expand
(full-unicode
(import (chibi char-set full)
(chibi char-set base)
(chibi iset base))
(include "char/full.scm")
(include "char/case-offsets.scm"))
(else
(include "char/ascii.scm")
(import
(only (chibi)
string-ci<=? string-ci<? string-ci=? string-ci>=? string-ci>?
char-ci<=? char-ci<? char-ci=? char-ci>=? char-ci>?
char-alphabetic? char-lower-case? char-numeric?
char-upper-case? char-whitespace? digit-value
char-upcase char-downcase))))
(include "digit-value.scm")
(export
char-alphabetic? char-ci<=? char-ci<? char-ci=? char-ci>=? char-ci>?
char-downcase char-foldcase char-lower-case? char-numeric?
char-upcase char-upper-case? char-whitespace? digit-value
string-ci<=? string-ci<? string-ci=? string-ci>=? string-ci>?
string-downcase string-foldcase string-upcase))

On 2/6/13, Ken Dickey <Ken.Dickey at whidbey.com> wrote:
> On Tue, 5 Feb 2013 09:20:24 +0000
> "H. Hirzel" <hannes.hirzel at gmail.com> wrote:
>
>> Hello all
>>
>> In the meantime I am investigating how to construct a small library
>> which works with WideCharacters and WideStrings and the FileStream and
>> UTF8Converter which deals with it.
>
> Hannes,
>
> Indeed Unicode is moby complex.
>
> 	http://www.unicode.org/versions/Unicode6.2.0/
>
> I don't know if it helps, but Scheme has probably the minimal defined
> Unicode support -- basically read/write, code points, comparisons, and
> up/down-casing. The scheme standards group has argued Unicode implementation
> features for years. [See 7th draft]
> 	http://scheme-reports.org/2012/working-group-1.html
>
> Chibi-Scheme is a bytecode implementation written in C which implements this
> support.
>
> 	https://code.google.com/p/chibi-scheme/
>
> This might be a stretch, but the implementation strategy has been gone over
> by many eyeballs.
>
> $0.02,
> -KenD
>
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