[antlr-interest] ANTLR274: Small functional extension proposal: synonym

[Terence Parr]

Hi.  Well, that's pretty specialized.  Further, all you have to do is 
add them to the hashtable of literals with the same token type and 
it'll just work. :)

Ter
On Sep 7, 2004, at 4:51 AM, Francis ANDRE wrote:

> Hi Terence & all
>
> I would like to propose you the following extension to manage simply
> synonyms. One could define in the tokens section definition some
> lexemes that abstract themself to a same token like :
>
> tokens {
> 	 YES = "YES" | "Y" | "OK" | "YEAP" | "DA";
> }
>
> Since all literals above should returns the same YES token value,
> IMHO, it should be enough to generate in the Lexer something like:
>
> void Lexer::initLiterals()
> {
> 	literals["YES"] = 3;
> 	literals["Y"]= 3;
> 	literals["OK"] = 3;
> 	literals["YEAP"] 3;
> 	literals["DA"] = 3;
> }
>
>
> In fact, this will avoid to have a grammar rule that specifies all
> the alternatives to get a YES which is really the case!!
>
>
> What do you think about??
>
> Cheers
>
> FA
>
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> Yahoo! Groups Links
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--
CS Professor & Grad Director, University of San Francisco
Creator, ANTLR Parser Generator, http://www.antlr.org
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