Hello developers,
I cannot figure out how to disambiguate the following grammar using syntactic
predicate, so the range rule takes precedence over the offset rule.
Could anyone advice? I prefer to keep separate range and offset rules because
of the custom AST tree construction.
Thanks for any pointers,
Thomas
grammar test;
program : (expression)* ;
expression
:
Identifier ((range) => range)?
| offset
;
range : Integer ('-' Integer)? ;
offset : ('+' | '-') Integer ;
Identifier : ('a'..'z')+ ;
Integer : ('0'..'0')+ ;
WhiteSpace : (' ' | '\t' | '\r\n' | '\r')+ { $channel=HIDDEN; };
--~--~---------~--~----~------------~-------~--~----~
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