[antlr-interest] source to source transformations

[Gavin Lambert]

At 06:10 12/03/2009, Robert Soule wrote:
 >What I think the right translation approach is to build a B
 >language AST by hand. So, when I start the translation, I
 >create a B language stub AST (maybe a program node, with
 >null a section and b section children). I then would want
 >to hold pointers to both those null childen, and when I
 >encounter an 'a' or 'b; statement, I add it as a child to
 >the appropriate parent node.

You should be able to do this using scopes to hold either the root 
or the most-recently-added child of each set (I forget which one 
the tree api needs).  Or, for that matter, member 
variables.  Basically just call the tree-construction routines "by 
hand" as needed.