[antlr-interest] AST construction - adding extra children via semantic action

[Terence Parr]

Hi Bill.I think the way to do it is to have the arbitrary action add to the rule_list List built by ANTLR.  try

> spec 
>  :	^(SPEC r+=rule+)
>        { <add nodes to $r list> }
>        -> ^(SPEC $r+)
>  ;


It might just work :)
T
On Aug 11, 2010, at 12:17 PM, Bill Andersen wrote:

> Hi Folks
> 
> Here's the relevant fraction of a tree grammar I'm working on...
> 
> spec 
>  : ^(SPEC rule+)
>  ;
> 
> rule 
>  : ^(RULE_DECL ID alts)
>  ;
> 
> It's a grammar that recognizes a language, the output of which is another ANTLR grammar.  
> 
> I want the first rule to look like this:
> 
> spec 
>  :	^(SPEC rule+)
>        { < some action here > }
>        -> ^(SPEC < augmented list of rules >)
>  ;
> 
> In other words, I want to add some extra RULE_DECL trees on to the end of whatever rule+ accumulates, based on semantic information gathered during the tree parse.
> 
> Is there a straightforward way to do this?
> 
> Thanks
> 
> 	.bill
> 
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