nl_tokens: Constructor
pl_tokens: function VarStream ( rootObject , rootProperty , options ) { var self = this ; // Ensure new were used
   if ( ! ( this instanceof VarStream ) ) { return new VarStream ( rootObject , rootProperty , options ) ; } // Ensure we had root object and property
   if ( ! ( rootObject instanceof Object ) ) { throw new Error ( 'No root object provided.' ) ; } if ( 'string' !== typeof rootProperty || ootProperty  =  ') throw new Error ( 'No root property name given.' ) ; } // Parent constructor
   DuplexStream . call ( this ) ; this . _varstreamReader = new VarStreamReader ( rootObject , rootProperty , options ? options & VarStreamReader . OPTIONS : 0 ) ; this . _varstreamWriter = new VarStreamWriter ( function ( str ) { self . push ( new Buffer ( str , 'utf8' ) ) ; } , options ? options & VarStreamWriter . OPTIONS : 0 ) ; // Parse input
   this . _write = function _write ( chunk , encoding , done ) { this . _varstreamReader . read ( chunk . toString ( encoding !== 'buffer' ? encoding : 'utf8' ) ) ; done ( ) ; } ; // Output data
   this . _read = function _read ( ) { this . _varstreamWriter . write ( rootObject [ rootProperty ] ) ; this . <mask> ( null ) ; } ; }