[antlr-interest] Conditional tree parsing

[VAUCHER Laurent]

  Thank you all.

  My final solution is

  #(IF_TOKEN t=boolean_expression thenAst:. elseAst:.)
     { val = this.expression(t ? thenAst : elseAst); }

  where 
   - expression is the main rule and
   - boolean_expression only casts expression to a boolean


Laurent.