Doesn’t a simple approach like the one shown below work?
r : ASSIGNMENTOP | KEYWORDMARKER
;
ASSIGNMENTOP : ':=' ;
KEYWORDMARKER : ':' ;
I assume you want a different token for ‘:=’ and ‘:’. If I understood the
problem wrong, let me know.
Cheers, Indhu
From: [email protected]
[mailto:[email protected]] On Behalf Of Loïc Quéran
Sent: Wednesday, October 14, 2009 2:57 PM
To: [email protected]
Subject: [antlr-interest] Syntactic predicates in lexer
Hi,
This is probably a very simple question, but I can't get syntactic
predicates to work in lexer rules:
AssignmentOperatorOrKeywordMarker
: ':=' => AssignmentOperator
| ':' => KeywordMarker
;
KeywordMarker
: ':'
;
AssignmentOperator
: ':='
;
What I want to achieve is to have the lexer produce an assignment operator
':=' token instead of a keyword marker ':' whenever possible.
The error is "unexpected token: ':='" at AssignmentOperatorOrKeywordMarker
rule definition.
Any help would be welcomed.
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