From: Lex Williams <etaern@...>
Date: 2008-08-30T01:55:38+09:00
Subject: Re: how can I debug treetop grammar?

> SyntaxNode#inspect shows a wealth of information, including an indented
> node hierarchy, what input that node matched (abbreviated) and what
> accessor methods are added by the modules extended into each node.
> 
> Parser#failure_reason tells you where it got to, and what tokens would
> have allowed it to get further.
> 
> If that isn't enough, try calling your grammar from a lower-level rule
> and working up until you see where it's failing.
> 
> Also don't forget that there's a "tt" command you can use to generate
> the grammar into a ruby file you can inspect.
> 
> As for your earlier query, it's a known bug.
> 
> Clifford Heath.

Thank you Clifford , I really appreciate you taking the time to answer 
this .
I will look into them , and post here whatever questions I will have !
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