From: Charles Thornton <ceo@...>
Date: 2008-02-10T04:27:00+09:00
Subject: Re: IRHG -- Dumping T-Nodes

Thanks,

    I will study your info,

    Chuck T.


Phlip wrote:
> Charles Thornton wrote:
>
>> I have been looking a 'rubynode' .
>>
>> The problem is I don't have a clear idea of the
>> actual structure of the AST.
>>
>> I assume that their is a tree structure of Nodes
>
> Yep. For some, the tree is simply a transliteration of the input. 'if 
> x then y end' turns into an 'if' node with leaves containing a 
> condition, a 'then' node, and an 'else' node. (So does ? : , by the way!)
>
> For others Ruby statements, the tree is deep and sick. For example, 
> all the arguments of a function, and some of its local variables, are 
> packed up into a node called "scope", where they don't exactly match 
> their location in the source.
>
> Pull down these files and play with them:
>
>   http://phlip.svnrepository.com/svn/yar_wiki/lib/assert_2_0.rb
>   http://phlip.svnrepository.com/svn/yar_wiki/lib/ruby_reflector.rb
>   http://phlip.svnrepository.com/svn/yar_wiki/test/assert_2_0_test.rb
>   http://phlip.svnrepository.com/svn/yar_wiki/test/ruby_reflector_test.rb
>
> They should, roughly, how to disassemble a transformed list of 
> RubyNode objects back into a rough form of Ruby source. To see a tree 
> of nodes in action, add pp node to any of the functions like def _if, 
> and run all the tests.
>