How to implement JavaScript/ECMAScript “no LineTerminator here” rule in JavaCC?

Question

I continue working on my JavaCC grammar for ECMAScript 5.1. It actually goes quite well, I think I\'ve covered most of the expressions now.

I have now two questions, bot

Answer 1

I think for the "restricted productions" you can do this

void PostfixExpression() : 
{} {
     LeftHandSideExpression() 
     (
         LOOKAHEAD( "++", {getToken(0).beginLine == getToken(1).beginLine})
         "++"
     |
         LOOKAHEAD( "--", {getToken(0).beginLine == getToken(1).beginLine})
         "--"
     |
         {}
     )
}