[antlr-interest] Can lexer rules return values?
Gavin Lambert
antlr at mirality.co.nz
Fri Feb 15 23:54:19 PST 2008
At 20:29 16/02/2008, Steve Bennett wrote:
>I was sure I read something about lexer fragment rules being
able
>to return values, but it doesn't seem to work. My rule:
IIRC, there was some discussion that they ought to be able to, but
I don't think they can at the moment, no.
I think you can use scopes (though I also recall some discussion
that scopes didn't work in the lexer, but I think that was for a
much older version), or failing that, some member variables.
>fragment EXTENSION_TAG_OPEN returns [boolean selfclose=false]:
> LT EXTENSION_NAME (SPACE* ATTR)? SPACE* (SLASH
>{$selfclose=true;})? GT
> ;
This is looking complicated enough (and with embedded whitespace
to boot) that perhaps it ought to be in the parser instead.
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