[antlr-interest] Bug in generation code

[Johannes Luber]

Hi,

The attachment has an unmodified ANTLR grammar, which exposes a bug. The
"rule" rule goes as follows:

rule
scope {
	String name;
}
   :    DOC_COMMENT?
	( modifier=('protected'|'public'|'private'|'fragment') )?
	id {$rule::name = $id.text;}
	'!'?
	( arg=ARG_ACTION )?
	( 'returns' rt=ARG_ACTION  )?
	throwsSpec? optionsSpec? ruleScopeSpec? ruleAction*
	':'	altList	';'
	exceptionGroup?
	-> ^( RULE id {modifier!=null?adaptor.create(modifier):null}
              ^(ARG $arg)? ^(RET $rt)?
	      optionsSpec? ruleScopeSpec? ruleAction*
	      altList
	      exceptionGroup?
	      EOR["EOR"]
	      )
    ;

The problem is with this line:

( modifier=('protected'|'public'|'private'|'fragment') )?

While the strings are recognized correctly, they aren't set as value to
modifier. In other words, 'fragment' is simply swallowed. I suppose this
is a problem with Java.stg. Or is the source somewhere else?

Best regards,
Johannes Luber
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