[antlr-interest] Matching compound keywords in the lexer
Bart Kiers
bkiers at gmail.com
Fri Nov 25 12:54:42 PST 2011
Hi Franck,
On Fri, Nov 25, 2011 at 9:47 PM, franck102 <franck102 at yahoo.com> wrote:
> ...
containOperator : CONTAINS_TEXT | CONTAINS_MATCH
>
> CONTAINS_TEXT
> : 'contains' WS+ ( 'match' { $type=CONTAINS_MATCH }
> | 'text' )
> ;
>
> // CONTAINS_MATCH:; // causes "token definitions can never be matched"
> error
>
>
Add CONTAINS_MATCH to your @tokens{...} and create an empty fragment rule
called CONTAINS_MATCH to silence the warning:
-----------------------------
tokens {
CONTAINS_MATCH;
}
...
CONTAINS_TEXT
: 'contains' WS+ ( 'match' CONTAINS_MATCH
| 'text' )
;
...
fragment CONTAINS_MATCH : ;
-----------------------------
Regards,
Bart.
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