nl_tokens: Returns a range of items in this collection
pl_tokens: function ( start , end ) { var me = this , items = me . items , range = [ ] , i ; if ( items . <mask> < 1 ) { return range ; } start = start || 0 ; end = Math . min ( typeof end == 'undefined' ? me . length - 1 : end , me . length - 1 ) ; if ( start <= end ) { for ( i = start ; i <= end ; i ++ ) { range [ range . length ] = items [ i ] ; } } else { for ( i = start ; i >= end ; i -- ) { range [ range . length ] = items [ i ] ; } } return range ; }