[antlr-interest] Java synpred fragment generating errors

[Louis Burroughs]

antlr 3.4
java 1.6
os: windows xp

Hello,

When I try to use syntactic predicates in my grammar I am getting an error
in the generated grammar parser file.  My variables are not initialized
correctly.  I am new to antlr and syntactic predicates so I am not sure if
the problem is in my grammar or in the template.  This also happens when I
turn the backtracking option to true and remove the predicates from my
grammar.



// $ANTLR start synpred50_EsqlGrammar
    public final void synpred50_EsqlGrammar_fragment() throws
RecognitionException {
  -->   *void  =null;*


        // C:\\EsqlParser\\src\\com\\abc\\iaf\\plugin\\EsqlGrammar.g:393:23:
( LEFT_BRACKET var_atom1= atom RIGHT_BRACKET )
        // C:\\EsqlParser\\src\\com\\abc\\iaf\\plugin\\EsqlGrammar.g:393:24:
LEFT_BRACKET var_atom1= atom RIGHT_BRACKET
        {

match(input,LEFT_BRACKET,FOLLOW_LEFT_BRACKET_in_synpred50_EsqlGrammar2008);
if (state.failed) return ;

        pushFollow(FOLLOW_atom_in_synpred50_EsqlGrammar2012);
        var_atom1=atom();

        state._fsp--;
        if (state.failed) return ;


match(input,RIGHT_BRACKET,FOLLOW_RIGHT_BRACKET_in_synpred50_EsqlGrammar2014);
if (state.failed) return ;

        }

    }

Grammar Syntax:

variable
  :
  var_id1=IDENTIFIER ((LEFT_BRACKET var_atom1=atom
RIGHT_BRACKET)=>LEFT_BRACKET var_atom1=atom RIGHT_BRACKET)?
(pe+=path_element)*
    ->
      ^(VARIABLE ^(BRACKET $var_atom1)$var_id1  $pe* )
  ;


This also happens with tokens:

Token =null;

Thanks in advance,
Louis Burroughs