Re: Ada95 to Ada2005 parser - currently using lex/yacc - problem with Unicode!

haberg@math.su.se (Hans Aberg)
22 Dec 2006 01:09:11 -0500

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Ada95 to Ada2005 parser - currently using lex/yacc - problem with Unic twometresteve@googlemail.com (2006-12-21)
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From: haberg@math.su.se (Hans Aberg)
Newsgroups: comp.compilers
Date: 22 Dec 2006 01:09:11 -0500
Organization: Mathematics
References: 06-12-082
Keywords: Ada, i18n
Posted-Date: 22 Dec 2006 01:09:10 EST

twometresteve@googlemail.com wrote:


> In particular, is it going to be at all viable to reuse my exising
> lex/yacc grammar with a tool that supports Unicode - before upgrading
> the grammar to support Ada2005?


Well, you can use a Flex generated lexer to parse UTF-8/32, by rewriting
Unicode regular expression into ones of those encodings. I wrote some
Haskell functions doing that, posted in the Help-Flex mailing list
2005-01-11, "Unicode Flex Character Classes":
  help-flex@gnu.org
  http://lists.gnu.org/mailman/listinfo/help-flex


--
    Hans Aberg

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