I'm trying to create tokens for the guards of C header files (with
filter=true), e.g. '#define __hello_h_' => <GUARD, #define
__hello_h_>, and have the following rules defined:
GUARD : '#' LETTER+ WS+ IDPART '_';
ID : IDPART;
WS : (' ' | '\n')+ {$channel = HIDDEN;};
fragment
IDPART : LETTER ( LETTER | DIGIT )*;
fragment
LETTER
: '$'
| '\u0041'..'\u005a'
| '\u0061'..'\u007a'
| '_'
;
fragment
DIGIT : '0'..'9';
Using these rules GUARD will never appear in the token stream. If I
change it to:
GUARD : '#' LETTER+ WS+ LETTER (LETTER | DIGIT)* '_';
the rule lexes correctly. I have two questions:
1. Why does it not lex correctly when I lex with IDPART?
2. Is there a way to set the value of token GUARD to be just the
IDPART portion of the lexem?
Thanks in advance,
JK
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