From: Tom Cloyd <tomcloyd@...>
Date: 2009-03-25T17:53:21+09:00
Subject: how to call instance method from within Treetop gem

I'm trying to call an instance method from within a gem (Treetop), and 
nothing I've tried is working (3 hours into it - no results). I'll do my 
best to simplify the problem.

I have a class instance which sets things up with this...

    Treetop.load '../data/sn_grammar' # <= this loads a data file which 
will be process as Ruby, after some preprocessing

    @parser = Base_grammarParser.new # < = Treetop class instance

My class method with the code above then calls another method in the 
same class - both in my module SN, class SetNet.

The other method then calls a method of the @parser instance, and THAT 
one gives to eval some of the text in the sn_grammar file referenced in 
the first code line above. That text then calls another method - 
showhelp - back in my class instance. But it cannot find it. I'm not 
naming it correctly, somehow.  I get this error:

(eval):71:in `act': undefined method `showhelp' for SyntaxNode+HelpMain0 
offset=0, ".h":Treetop::Runtime::SyntaxNode (NoMethodError)
        from ../lib/setnet/SN.rb:265:in `proc_command'
        from ../lib/setnet/SN.rb:182:in `user_interface'
        from ../lib/setnet/SN.rb:113:in `manage'
        from ../lib/setnet/SN.rb:38:in `startup'
        from ./setnet:26

I've tried every permutation I can image, to tell eval how to find my 
method. No go.

Module SN => class SetNet => instance setnet => method showhelp. <= 
That's what I'm trying to get to.

How can I tell eval, executing off in the gem directory, where this 
method is found? That's my problem, I think. I'm run out of 
possibilities, so I'm failing to grasp something basic most likely.

Any help would be appreciated.

Tom

-- 

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Tom Cloyd, MS MA, LMHC - Private practice Psychotherapist
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