[antlr-interest] v3: Do semantic predicates work differently?

[Axel Rauschmayer]

Given the following grammar (motivation: templates for a web  
application, text in triple brackets is not escaped, all other text  
will be escaped):

block returns [ List<String> value = new ArrayList<String>() ] :
     ( DIRECT_TEXT { $value.add("("+new DirectText 
(DirectText.removeBrackets($DIRECT_TEXT.text))+")"); }
     | ESCAPED_TEXT { $value.add($ESCAPED_TEXT.text); }
     )+;

ESCAPED_TEXT :
     ( {input.LA(2)!='[' || input.LA(3)!='['}?=> '['
     | ~( '[' | '{' | '}' | '\\' )
     )+
;

DIRECT_TEXT :
    '[[[' (options {greedy=false;} : .)* ']]]'
;

and the input "a[[[b]]]c", I get the following warning:
> line 1:1 required (...)+ loop did not match anything at character '['

Any ideas as to why this does not work?

Thanks,

Axel

--
Axel Rauschmayer
http://www.pst.ifi.lmu.de/~rauschma/