Re: [Ctool-develop] using ctool as a library

[Stefan S. <se...@sy...>]

Shaun Flisakowski wrote:
> Stefan,
> 
> The best example to look at is probably the code that prints out the  
> AST.  This starts at:
>     operator<<(std::ostream& out, const TransUnit& tu)
> in project.cpp
> 
> Each translation unit is composed of a list of statements, an hierarchy  
> of C++ classes for each type (for, while, expression, etc).  Each of  
> the statements has members in it that give pointers to the expressions  
> it uses, or in some cases, the statement required.
> 
> Most of the members of the AST are public, you can just reach in and  
> grab what you need.


I see. Well, what do you think of the visitor pattern as a general way
to traverse the tree ? Each type and statement type would implement an
'accept' method (say), which only calls a visitor's 'visit' method with
the appropriate type.

Then you could provide specific visitors to print out what the current 
'print' methods do, and I could write my own visitor(s) to map ctool's
AST to my own.

I think such a traversal is useful because else everybody has to
reimplement the traversing mechanism.

Regards,
		Stefan