False alarm. There was some subtle abuse going on deep down in our setup of
the parser (our tree adaptor was creating error nodes incorrectly). Apologies!
Richard
Richard Thrippleton wrote:
> I'm using the Java target with ANTLR 3.2, and having a problem in a rule in
> my parser grammar that looks like this:
>
> "variableInit [ String name ]
> : ASSIGNMENT id=initializer
> -> ^(ASSIGNMENT IDENTIFIER[$ASSIGNMENT, $name] initializer)"
>
> In a particular case where the 'initializer' rule fails to match and issues a
> syntax error, I'm getting a RewriteEmptyStreamException that cites "rule
> initializer" popping up from a line that looks like this:
>
> "// 1151:5: -> ^( ASSIGNMENT IDENTIFIER[$ASSIGNMENT, $name] initializer )
> {
> {
> CommonTree root_1 = (CommonTree)adaptor.nil();
> root_1 = (CommonTree)adaptor.becomeRoot(stream_ASSIGNMENT.nextNode(),
> root_1);
> adaptor.addChild(root_1, (CommonTree)adaptor.create(IDENTIFIER,
> ASSIGNMENT179, name));
> adaptor.addChild(root_1, stream_initializer.nextTree());
> <-------------------- ****This line****
> adaptor.addChild(root_0, root_1);
> }
> }"
>
> In terms of error handling we're just using the default recovery (not
> overriding it with 'catch'/'rulecatch'). We've overridden reportError to
> pretty-print the RecognitionExceptions, but that's about it. Should I be
> needing to do anything special to cope with parsing failures of subrules, or
> should the default be sufficient to prevent these exceptions? Otherwise,
> where is the problem likely to lie - a defect elsewhere in my grammar, or in
> ANTLR?
>
> Cheers,
> Richard
>
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