[antlr-interest] How to specify ‘any non-control symbol’?

[Jim Idle]

On Thu, 2008-10-30 at 16:10 +0100, Hendrik Maryns wrote:

> Hendrik Maryns schreef:
> > Johannes Luber schreef:



> Why doesn’t
> 
> LABEL : ~(WHITESPACE | '(' | ')')+ ;
> 


Your WHITESPACE rule probably defines a sequence rather than a set.
Create a:

fragment WSCHARS : (' ' | '\t' | '\f');

Then:

LABEL : ( ~ (WSCHARS | '(' | ')' ) )+;

Will probably work, though you are probably gong to create huge lexer
tables (which we are hoping to do something about shortly).

Jim 
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