[antlr-interest] How to get difference set between two sets?

[Terence Parr]

On Friday, April 12, 2002, at 09:17  AM, yhhf_dy wrote:

> Hi,
>
> There are two set described as following rules :
>
> IDENTIFIER:('a'..'z'|'A'..'Z'|'_') ('a'..'z'|'A'..'Z'|'_'|'0'..'9')*
> keyword : "class" | "public" | "private" | etc.
>
> I want to get difference between IDENTIFIER set and keyword set, that
> is  difference set = IDENTIFIER set - keyword set
>
> Would you please help me how to implement this in ANTLR.

That set is infinite.  No way to delineate on a finite computer.

Are you asking how to get ANTLR to return IDENTIFIER and CLASS, PUBLIC 
etc...?  That's just a literals issue.  See the doc or FAQ.

Regards,
Ter
--
Co-founder, http://www.jguru.com
Creator, ANTLR Parser Generator: http://www.antlr.org


 

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