Re: [Grammatica-users] Getting token regular expressions

[Oliver Gramberg]

Hi Oliver,

as far as I know, there is no grouping
extraction in Grammatica.

Class Tokenizer has TokenPattern
GetPattern(int id),
and TokenPattern has string
GetPattern() (or the property string
Pattern for .NET) - would this help?

You could also
- define a production, with a token
for each part of your RE,
- hack the tokenizer to disable white
space upon recognition of the first token,
- enable white space when done.
I use that hack, but for a different
purpose. If needed, I can provide a patch.

It would be nice if Grammatica had a
"fragment" feature like one or two other parser generators. I
think this is on the feature proposition list.

Regards
Oliver

---

Oliver Gramberg
ABB AG
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Oliver Bock <address@hidden>
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15.09.2009 08:51

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Subject	[Grammatica-users] Getting token regular expressions

I have a token like this:

FFORMAT = <<F(\d+)\.(\d+)>>

In my analyzer I would like to refer to the groups without needing to 
copy-and-paste the text of the regular _expression_, because the 
_expression_ might change.  I cannot see a way to get the _expression_
back 
from my Tokenizer class.  Is it possible?


  Oliver

P.S. Grammatica rocks: so simple, so un-yacc.