[antlr-interest] Regarding lexer rules return values

[Raghavendra Anjana (RBEI/EMT2)]

Hello Dave,

I have used the parser rule with some modifications and started working....

Thanks a lot for your suggestion..

Regards
Raghavendra

________________________________
From: Dave Dutcher [mailto:dave at tridecap.com]
Sent: Tuesday, 2. June 2009 8:10 PM
To: Raghavendra Anjana (RBEI/EMT2); antlr-interest at antlr.org
Subject: RE: [antlr-interest] Regarding lexer rules return values

Is there a reason you can't make LEXERRULE a parser rule?


parserrule: (parserrule2);

parserrule2:  (LEXERRULE1) (LEXERRULE2) (LEXERRULE3);

Then you can do exactly what you want.

Dave



________________________________
From: antlr-interest-bounces at antlr.org [mailto:antlr-interest-bounces at antlr.org] On Behalf Of Raghavendra Anjana (RBEI/EMT2)
Sent: Tuesday, June 02, 2009 4:27 AM
To: antlr-interest at antlr.org
Subject: [antlr-interest] Regarding lexer rules return values

Hello,

I have a grammar with a parser rule as shown below

parserrule: (LEXERRULE);

LEXERRULE: (LEXERRULE1)(LEXERRULE2)(LEXERRULE3);

Whenever my parser rule is recognized I want to return the text identified for LEXERRULE1,2,3 separately.  But I believe that we cannot return values from a lexer rule.

Is there a way so that I can get the LEXERRULE1,2,3 from LEXERRULE.

i.e.   Something like

Parserrule return [x,y,z]: (LEXERRULE) {$x= LEXERRULE.LEXERRULE1;$y =LEXERRULE.LEXERRULE2;$z=LEXERRULE.LEXERRULE3 };

LEXERRULE: (LEXERRULE1)(LEXERRULE2)(LEXERRULE3);
LEXERRULE1:'ab';
LEXERRULE2:'xy';
LEXERRULE3:'12';


The input for this parser is   abxy12
The scenario is that whenver this text is recognized or matched then I want ab, xy and 12 to be return back from the parser rule  each separately.

Thanks a lot in advance.

Thanks and Regards
Raghavendra

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