[antlr-interest] Returning subrule string template by default

[Damien Cassou]

Hi,

I have a tree grammar which looks like:

document :
  ^(DOCUMENT (type_def {templates.add($type_def.st);})*)
;

type_def:
  struct | enum | foo | ... | bar
;

where struct, enum, foo, bar and the other are rules which return
string templates.

This doesn't work because the type_def rule doesn't return the string
template returned by the subrules.

I tried other things like the following:

type_def: a=(struct | enum |...) {templates.add($a.st);}

type_def: (a=struct | a=enum | ...) {templates.add($a.st);}

type_def @init {templates.add($type_def.st);}
  : struct | enum | ...;

None of them work. The only solution I found was to duplicate the
action on all subrules.

-- 
Damien Cassou
http://damiencassou.seasidehosting.st

"Lambdas are relegated to relative obscurity until Java makes them
popular by not having them." James Iry