[antlr-interest] Saving Lexer State?

[Tom Davies]

I'm trying to use an ANTLR 2.x lexer fir syntax highlighting in  
Intellij IDEA.

The lexer interface it assumes can save the state of the lexer (which  
is just a single int) and later restore it. This allows incremental  
re-lexing as you type.

Is there any way to do that with an ANTLR lexer? Obviously I can  
record the input string leading up to the state and simply re-lex it,  
but I'm wondering if there's a cheaper approach?

Thanks,
   Tom