[antlr-interest] Simple Grammar breaks ANTLRWorks Interpreter & Debugger?
David-Sarah Hopwood
david-sarah at jacaranda.org
Sun Aug 16 18:08:50 PDT 2009
consiliens at gmail.com wrote:
> I looked at ANTLRStringStreams consume() method and noticed that it
> checks for a '\n'. In the current grammar I'm skip()ing newlines,
> instead of placing them on a hidden channel.
>
> I made the following modification to the grammar in ANTLRWorks which
> promptly broke the compiler.
> fragment NEWLINE : '\n' '\r'? {$channel=HIDDEN;};
> fragment WS : ('\n'|'\r'|'\t'|' ')+ {$channel=HIDDEN;};
>
> The error message is "cannot find symbol : variable _channel".
That's quite strange; I'm using $channel = HIDDEN in ANTLRWorks (version
1.2.3) with no problems. Could something be wrong with your ANTLR/ANTLRWorks
installation?
Can you reduce the grammar to the minimum necessary to reproduce the above
error message, and post it here?
--
David-Sarah Hopwood ⚥ http://davidsarah.livejournal.com
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