> -----Original Message-----
> From: [email protected] [mailto:antlr-interest-
> [email protected]] On Behalf Of Colin Macdonald
> Sent: Thursday, November 18, 2010 9:03 AM
> To: [email protected]
> Subject: Re: [antlr-interest] Is '!' operator working with ANTLR 3.1.2
>
> OK, checked the reference last night (page 98) and ! is definitely
> parser only
>
> Jim's got a good point about white space, so you need to go back to
> your original lexer rule and hack the text.
>
> The easiest option would be to always trim out the "EXT." by calling
> something like
>
> $EXTERNAL_CALL.text.substring(4)
>
> I don't suggest messing around with start & stop. You don't have
> access to the Token in the lexer actions,
Yes, you DO have access to the token - it isn't created until the rule
exits, so you set the things that will be used by the lexer.
besides it would be fragile
> unless you extend CommonToken to track if you've made the change
> already.
No, you don't need to do that, you change it in the lexer actions and then
never touch it again. From the top of my head (so check it):
K : 'CCCC'
{ $start = getCharIndex(); }
'DDD' 'A'*
etc
However, it is probably just as easy to use a substring when you reference
the token text, which you will generally only do once anyway.
Jim
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