[antlr-interest] lexer rule precedence

[Jim Idle]

You need to post your grammar and make sure that you have not used
‘literals’ in the parser.



Jim



*From:* Ryan Brown [mailto:ribrdb at google.com]
*Sent:* Friday, March 18, 2011 10:59 PM
*To:* Jim Idle
*Cc:* antlr-interest at antlr.org
*Subject:* Re: [antlr-interest] lexer rule precedence



True is first.  I also tried adding True and Identifier to the tokens list,
(with True first), but that doesn't make any difference. I also added an
ERR: . token like you suggested and that doesn't help.

-- Ryan Brown

On Fri, Mar 18, 2011 at 8:18 PM, Jim Idle <jimi at temporal-wave.com> wrote:

List it before IDENTIFIER as you have written it here and add a ERR : . ;
as the last rule to catch non-matches and issue an error.

Jim


> -----Original Message-----
> From: antlr-interest-bounces at antlr.org [mailto:antlr-interest-
> bounces at antlr.org] On Behalf Of Ryan Brown
> Sent: Friday, March 18, 2011 8:15 PM
> To: antlr-interest at antlr.org
> Subject: [antlr-interest] lexer rule precedence
>
> I have a lexer with rules like this:
>
> TRUE : 'true';
> IDENTIFIER : 'a'..'z'+;
>
> The text "true" parses as IDENTIFIER.  How do I get it to parse as
> TRUE? Do I need to add not and all my keywords to the IDENTIFIER rule?
> I don't see anything like that in the java grammar.
>
> -- Ryan Brown
>

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