[antlr-interest] Switching keywords
Sean Walton
swalton at cs.utah.edu
Tue Sep 5 12:00:35 PDT 2006
I mean "'A' statements are embedded in 'B' programs".
Thanks for the tip. I am using 3.0 -- would
"input.LT(1).getText().equals("includes")}?" be a reasonable solution?
-Sean
Loring Craymer wrote:
> What do you mean by "on top of"? Do you mean that "A" statements are
> embedded in "B" programs? Or that "B" compiles to "A"?
>
> If you just need to handle tokens that are keywords in one context and
> not another, then these are best handled as
>
> keyword
> :
> { LT(1).getText().equals("keyword") }? TEXT
> ;
>
> and then use "keyword" in the appropriate context. Semantic predicate
> hoisting is very handy, and "is a keyword only in context" is a common
> problem.
>
> --Loring
>
>
> */Sean Walton <swalton at cs.utah.edu>/* wrote:
>
> [This is for anyone that can answer this problem.]
> I am building a language (B) on top of another language (A). This
> causes a particular problem with any new reserved words defined in
> Language B. For example, if there needs to be a reserved word
> 'set' in
> Language B, but when in the context of Language A, 'set' still
> needs to
> be an identifier.
> Does anyone have any ideas how to do this?
> -Sean Walton
> PS. The real development is honestly more complicated than the above:
> there is a third language (C) involved. Why? I guess I like
> pain.... ;)
>
>
> ------------------------------------------------------------------------
> How low will we go? Check out Yahoo! Messenger's low PC-to-Phone call
> rates.
> <http://us.rd.yahoo.com/mail_us/taglines/postman8/*http://us.rd.yahoo.com/evt=39663/*http://voice.yahoo.com>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.antlr.org/pipermail/antlr-interest/attachments/20060905/4dd342aa/attachment.html
More information about the antlr-interest
mailing list