[antlr-interest] Any plans of next ANTLR Release

[Rick Mann]

On Apr 30, 2010, at 16:41:50, Terence Parr wrote:

> 
> On Apr 30, 2010, at 4:27 PM, Graham Wideman wrote:
>> This prompts me to wonder how debuggable these lexers will be?  Currently a certain amount of troubleshooting of lexing/parsing can be done by inspecting the generated lexer source, single-stepping it and so on.
>> 
>> If you move to encoding the lexer logic in bytecodes, does the generated lexer source become an inscrutable black box?  Or is there still meaningful source code to examine, trace etc?
> 
> Yup. The bytecode is actually easier to read than the java ;)
> 
> lexer grammar L2;
> A : 'ab';
> B : 'a'..'z'+ ;
> I : '0'..'9'+ ;
> 
> yields:
> 
> 0000:	split         9, 16, 29   // says 3 paths are possible
> 0009:	match8        'a'
> 0011:	match8        'b'
> 0013:	accept        4
> 0016:	range8        'a', 'z'
> 0019:	split         16, 26
> 0026:	accept        5
> 0029:	range8        '0', '9'
> 0032:	split         29, 39 // go back or fall out of loop into accept state
> 0039:	accept        6

This is a Java-only parser generator, then, isn't it?

-- 
Rick