Hi,
On Tuesday 09 of March 2010 at 06:38:58, inhahe wrote:
> Is there any way to make case-insensitive tokens? I mean, other than
> specifying it as [Bb][Ll][Aa][Hh] etc..
If you want _all_ tokens to be case-insensitive, there are actually two ways
of doing it (I didn't use ply for a long time, so this might be inaccurate,
but my information relates to regular expressions anyway):
1. Look at documentation sections 4.19 (custom reflags for lexer) and 6.12
(specify own lexer). In this way you can pass re.IGNORECASE to lexer and
this lexer to parser.
2. Specify (?i) anywhere in your tokens. If I remember correctly, ply makes
one big master regular expression (see section 4.3) to recognize tokens.
The "(?i)" anywhere in the regular expression makes the full expression
as case-insensitive - it is like specifying re.IGNORECASE in reflags (see
Python documentation, "re" module, section 8.2.1 Regular Expression
Syntax).
>
> I'm gathering that lexers combine all regexes into one single regex, so
> there's no way to do case-insensitivity?
>
> If it's not possible with ply, does anyone know if it can be done with
> pyparsing or ANTLR?
>
> Thanks
Cheers,
Oldřich.
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