Antlr4, How to find the Index of a child node in the Token Stream??

[Ravi Shekhar]

  I was trying to make a Control Flow Graph in ANTLR4 for Java. For a conditional statement e.g IF-Else, I am able to find out the Start and Stop Indexes:

int startIndex = ctx.start.getStartIndex();
int stopIndex = ctx.stop.getStopIndex();

  It does tell me the index from where the block starts and ends. However, I cannot do the same for its children, e.g. these are the children of an If-Else statement:

if
(x==5)
{System.out.println("one");}
else
{System.out.println("other one");}

How can I know the Index of "else", there is no getStartIndex() or it's equivalent