[antlr-interest] Re: Preprocessors - academic question

[jsrs701]

--- In antlr-interest at y..., John Allen Green <greenj at i...> wrote:
> 
> Here's one for you educated folks...
> 
> Given a preprocessor which allows branching and unrestricted code
> substitutions, is it impossible to work with the semantics of the
> preprocessing itself?
> 
> It would seem to me that since you could have code substitution 
doing code
> substitution, it would be impossible to build a parse tree of the
> preprocessing.

Okay, but you could build a tree of the *operations* to be performed, 
right?  And then apply the operations to the original source file?

Or am I completely not understanding the question?

JSRS


 

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