[antlr-interest] Trying to keep whitespace in an AST

[Matt Benson]

Are you trying to pretty-print all the source, or just
what you've augmented?  Does this wiki entry approach
what you're looking for:

http://www.antlr.org/wiki/pages/viewpage.action?pageId=1752

?

-Matt

--- Jamie Penney <jpen054 at ec.auckland.ac.nz> wrote:

> Hi all,
> I am trying to work out how to create a grammar that
> will build an AST 
> that keeps both comments and some whitespace.
> Basically the output will 
> be formatted code, but we need the semantic
> information provided by the 
> AST for other parts of the system. Any comments and
> blank lines need to 
> be kept in the output code. Is it possible to have
> rewriting and AST 
> generation turned on at the same time, or do I have
> to write two 
> separate grammars? I am new to ANTLR so sorry if I
> have the wrong idea 
> about anything.
> To give a concrete example, say I have a language
> that represents basic 
> C style statements like so:
> 
> int a    = 0;
> int b    = 1;
> int c    = 2;
> 
> // reassign a
> a = b + c;
> 
> What I need is the semantic information provided by
> an AST (whether a 
> statement is a declaration, assignment, ect), but I
> need to transform 
> the language partially too. I need to format the
> individual elements 
> consistently, so each would be of the form a = b +
> c; but I also need to 
> retain the newlines and comments between elements.
> 
> If anyone could point me in the right direction I
> would be very grateful.
> 
> Thanks,
> Jamie Penney
> 



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