[antlr-interest] AST transforms - propagation of semantic information

[Bill Andersen]

Folks,

Here's a fragment of a AST transformation grammar I'm working on

foo
	: ^(IMPL ^(OR x+=form+) y=form)
		-> ^(AND ^(AS_IMPL $x $y)+)
	;

I want to keep certain semantic information on tree nodes.  Figured  
out already how to do this with custom node classes.  What I want, in  
the example of the rule above, is for the semantic information on the  
root node (IMPL) to be automatically propagated to the output root  
node (AND).  Of course I can write actions in each such production to  
do this, but I have a whole lot of productions like this and writing  
all those actions is a maintenance problem.

Is there some way to do this pervasively, perhaps with a custom  
TreeAdaptor?  Thanks in advance.

	bill

Bill Andersen
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