[antlr-interest] Backtracking and labels

[Kieran Simpson]

@Bart - yes you're right, I forgot to add the leading ^ for the 
resulting AST in my example.  Typo :(

@Ivan - I ran my build with Antlr 3.3 and the resulting code is OK

static void synpred9_CoreConfiguration_fragment(pCoreConfigurationParser 
ctx )
{
	pANTLR3_COMMON_TOKEN    value;

	value       = NULL;

However I want to use 3.4 ;)

I was thinking it might be a classpath issue, however I'm not certain. 
The classpaths are (from my Ant build):

[java] '-classpath'
[java] 
'./lib/ST4-4.0.4.jar:./lib/antlr-2.7.7.jar:./lib/antlr-3.4.jar:./lib/antlr-runtime-3.4.jar:./lib/stringtemplate-3.2.1.jar'

[java] '-classpath'
[java] 
'./lib/antlr-2.7.7.jar:./lib/antlr-3.3.jar:./lib/antlr-runtime-3.3.jar:./lib/stringtemplate-3.2.1.jar'

What is really bothering my is that the the code generated from 
Antlrworks (when I Debug the grammar) is OK

public final void synpred9_CoreConfiguration_fragment() throws 
RecognitionException {
     Token value=null;

If I can get some pointers about where to look/what to look for in the 
code generators (eg: template fragments) I might be able to get more 
info on the code that's playing up.  It could be a bad JAR that's being 
retrieved by my build system (Apache Ivy).

Cheers,

On 23/07/64 5:59 AM, Ivan Brezina wrote:
> Hi
> maybe you're hitting already discovered bug. This was introduced in the
> version 3.4. What does the output look like when you use ANTLR version 3.3?
>
> Ivan
>
> Quoting Kieran Simpson <kierans777 at gmail.com>:
>
>> For my rule:
>>
>> rule
>> : OPTION1
>> | value=TION2 -> ($value)
>> ;
>>
>> with backtracking on (and memoize not that I think that's relevant) the
>> synpredicate code generated has errors, both for the Java and C targets
>> where the variable name is missing in the declaration
>>
>> eg:
>>
>> public final void synpred9_grammar_fragment() throws
>> RecognitionException {
>> Token =ll;
>>
>> and
>>
>> static void synpred9_grammar_fragment(pCoreConfigurationParser ctx )
>> {
>> pANTLR3_COMMON_TOKEN ;
>>
>> =ULL;
>>
>> Interestingly this grammar runs in debug mode when used with Antlrworks
>> even though I'm using version 3.4 of Antlr with my project and 3.4 is
>> included with Antlrworks (1.4.3).
>>
>> Just in case it's due to an out of date version, here are some md5sums
>>
>> 9638f9b7b1b823fcaba977f06f0dd761 ./antlr/3.4/antlrworks-1.4.3.jar
>>
>> 465472089d78cd80f926f5825a29ec7f ./lib/antlr-3.4.jar
>> 0e0318be407e51fdf7ba6777eabfdf73 ./lib/antlr-runtime-3.4.jar
>>
>> Is something out of date here or is this a bug with the backtracking
>> generation?
>>
>> Cheers,
>>
>> List: http://www.antlr.org/mailman/listinfo/antlr-interest
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>
>
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