| Bug parsing Xtext file [message #989381] |
Wed, 05 December 2012 17:48  |
Eclipse User |
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Here is my xtext file to parse PROLOG programs:
grammar org.archstudio.prolog.xtext.Prolog with org.eclipse.xtext.common.Terminals
generate prolog "http://www.archstudio.org/prolog/xtext/Prolog"
Program:
(clauses+=Clause)* (query=Query)?;
Clause:
(predicates+=Predicate) (':-' predicates+=Predicate (',' predicates+=Predicate)*)? '.';
Query:
'?-' predicates+=Predicate (',' predicates+=Predicate)* '.';
Predicate:
functor=Functor '(' terms+=Predicate (',' terms+=Predicate)* ')'
| terms+=Term functor=Functor terms+=Predicate;
Term:
(atom=ATOM) | (number=NUMBER) | ('\'' string=STRING '\'') | (variable=VARIABLE)
| (list?='[' (terms+=Predicate (',' terms+=Predicate)* ('|' rest=Predicate)?)? ']');
Functor:
name=(OPERATOR | ATOM);
terminal OPERATOR:
'==' | '\\=' | '.';
terminal NUMBER:
'-'? ('0'..'9')+;
terminal ATOM:
'a'..'z' ('0'..'9' | 'a'..'z' | 'A'..'Z' | '_')*;
terminal VARIABLE:
('A'..'Z' | '_') ('0'..'9' | 'a'..'z' | 'A'..'Z' | '_')*;
terminal STRING:
'a'..'z' | 'A'..'Z' |
'_' | '0'..'9' | '+' | '-' | '*' | '/' | '\\' | '^' | '~' | ':' | '.' | '?' | '@' | '#' | '$' | '&';
When I try to Generate Xtext Artifacts, it ends with an error of:
error(208): ../org.archstudio.prolog.xtext/src-gen/org/archstudio/prolog/xtext/parser/antlr/internal/InternalProlog.g:682:1: The following token definitions can never be matched because prior tokens match the same input: RULE_INT
The problem is that I'm not using the INT rule, so it shouldn't complain about it (right?).
Is this a bug, is there a workaround?
Thank you,
-- Scott
Attachment: Prolog.xtext
(Size: 1.08KB, Downloaded 147 times)
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