[antlr-interest] Visually display the DFA ANTLR generates

[Randall R Schulz]

Geoffrey,

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Top-posting isn't too cool, either.


On Wednesday 27 June 2007 11:07, Geoffrey Zhu wrote:
> For example, for the input "( security" the interpreter works well on
> the below grammar, but the ANTLR genereated code chokes on it. I
> guess that as long as there are two code bases (ANTLR and WORKS),
> there are discrepencies. Maybe Works can employ antlr to do the work.
> Then there is no discrepency.
>
> ID : ('a'..'z')+;
> fragment WS : ' ' | '\t' ;
> LPAREN    : '(' ;
> LP_SELECT : '(' WS* 'select';
> prog: (ID|LPAREN|LP_SELECT|WS)+ ;

Are you using backtracking in your grammar? Does ANTLRWorks show 
synthesized syntactic predicates in the racetrack diagrams for your 
productions?

What do you mean by "chokes?"

Of course, it's possible there are bugs, but I do believe that 
ANTLRWorks is does replicates the code of ANTLR itself and apart from 
the inherent limitations of the ANTLRWorks Interpreter, it (the 
debugger, i.e.) should be fully consistent with the behavior of parsers 
running stand-alone.

Again, if not, put together a repeatable, self-contained example and 
submit it as a bug report.


Randall Schulz