nl_tokens: Given a context function name and callback function overwrite it so that it calls printStackTrace () first with a callback and then runs the rest of the body .
pl_tokens: function ( context , functionName , callback ) { <mask> = context || window ; var original = context [ functionName ] ; context [ functionName ] = function instrumented ( ) { callback . call ( this , printStackTrace ( ) . slice ( 4 ) ) ; return context [ functionName ] . _instrumented . apply ( this , arguments ) ; } ; context [ functionName ] . _instrumented = original ; }