2009/12/9 Sam Harwell <[email protected]>
>
> Do you currently have the IDENTIFIER lexer rule located before (as in line
> number) ABSTRACT, etc.? I'm guessing that's the cause of your current problem.
Hi Sam,
Thanks for the quick response.
Unfortunately no, my IDENTIFIER rule is the last non-fragment rule in
the grammar file.
>
> Also, don't specify a value for k in your lexer.
>
Ok, but it does not matter much in my case.
>
> On a side note, this really isn't the ANTLR way to do things, but your
> generated code will be smaller and faster if you do this. I might have the
> syntax slightly wrong since I'm not a Java programmer. If you are using a
> combined grammar (lexer and parser in the same file), a downside of doing
> this is you have to always use ABSTRACT in the parser rules, where normally
> 'abstract' would alias itself to the token.
>
> @lexer
> {
> Hashtable<String, Integer> keywords = new Hashtable()
> {{
> put("abstract", ABSTRACT);
> put("break", BREAK);
> }};
> }
>
> // the fragment rules assign values to the token types that you can use in
> the parser.
> fragment ABSTRACT : ;
> fragment BREAK : ;
>
> IDENTIFIER
> @after
> {
> Integer value = keywords.get($text);
> if (value != null)
> setType(value); // might be state.setType
> }
> : ...
> ;
Interesting, that might work. I'll try this soon. But can you tell me
why my original example is wrong? If I understand ANTLR correctly this
should not pose any problems for LL(*)
--
Greetings
Marcin Rzeźnicki
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