[antlr-interest] Problem with lexical nondeterminism - ANTLR 2.7.7

[Gavin Lambert]

At 10:02 4/01/2008, clive.i.hill at jpmorgan.com wrote:
>If I try your suggestions with APAC_NUMERIC_TICKER above NUMER I 
>still get the same issue.  Harold your suggestion would work if 
>it matches NUMBER first but it was actually an 
>APAC_NUMERIC_TICKER.  The match actually happens the other way 
>around.

Ok, what's probably happening here is that ANTLR is discarding the 
predicate because there's only one alt.  I thought it was only 
ANTLR 3 that did that, but I guess v2 did as well.  In that case 
you'll need to combine the rules:

NUMBER
     : (INT COMMA) => APAC_NUMERIC_TICKER 
{$setType(APAC_NUMERIC_TICKER);}
     | (INT COLON) => RANGE               {$setType(RANGE);}
     | (DOT) => FLOAT                     {$setType(FLOAT);}
     | (INT DOT) => FLOAT                 {$setType(FLOAT);}
     | INT                                {$setType(INT);}
     ;

protected
APAC_NUMERIC_TICKER
     : INT COMMA CHAR CHAR
     ;