[antlr-interest] Path-based template selection

[Richard Clark]

On 7/29/07, Ted Villalba <ted.villalba at gmail.com> wrote:

> a : b ... //if I try to set a scope field here
>    | c
> b:  c
> c: CHAR  call template1 //it will not exist here

That makes sense, as you're trying to set the field after rule b
returns. How about this:

a
scope { boolean usesB; }
   : b
   | c
   ;

// fragment marker not required, but keeps you from accidentally
calling this directly
// in the code that uses the parser.
fragment
b: { $a::usesB = true; } c ;

fragment
c: CHAR  call {$a::usesB ? ...



...Richard