nl_tokens: Calls the function
pl_tokens: function ( context , callback ) { if ( arguments . length === 1 ) { callback = context ; context = this . _context ; } if ( this . isAsync ) { // clone the arguments so this.call can be reused with different callbacks var asyncArgs = this . _arguments . slice ( ) ; // push the callback onto the new arguments array asyncArgs . push ( callback ) ; // call the function this . fn . apply ( context , asyncArgs ) ; } else { // if the function isn't async, allow it to be called with or without a callback if ( callback ) { // If a callback is provided, it must use the error-first arguments pattern. // The return value of the function will be the second argument. try { callback ( null , this . fn . <mask> ( context , this . _arguments ) ) ; } catch ( e ) { callback ( e ) ; } } else { // If no callback is provided simply return the result of the function return this . fn . apply ( context , this . _arguments ) ; } } }