nl_tokens: / * next :
pl_tokens: function ( callback , onEnd ) { //because next function is changing, we can't go this.next.bind(this) S . asyncWhile ( function ( ) { this . next . <mask> ( null , arguments ) ; } . bind ( this ) , callback , function ( ) { this . close ( ) ; onEnd && onEnd ( ) ; } . bind ( this ) ) ; }