[antlr-interest] Who calls CommonTree.setTokenStartIndex ?

[kevin_mitchell at agilent.com]

I'm using Antlr 3.1 with the Java backend, and generating Antlr-style abstract syntax trees.  When I look at these trees I find that getTokenStartIndex (and StopIndex) are always set to -1.  I was expecting either the parser to emit calls to setTokenStartIndex, or some code in addChild to call this method whenever a new child was added.  But the parser doesn't seem to call this method, and adding a child doesn't seem to update the value either.  So where does the code to set the start index of a compound tree get called?  Is there some post-processing method I should be calling to set this, or some flag to tell the parser to generate such calls?

 

Thanks,

 

Kevin

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