nl_tokens: return constructor function that will generate a custom model view instance based on the parent model view class
pl_tokens: function ( ) { // create new instance based on class meta data var instance = _ . clone ( modelView ) // get number of args var numArgs = arguments . length // if function is passed a single object then these arguments will // be passed directly to the view instance func if ( numArgs === 1 && typeof arguments [ 0 ] === 'object' ) { instance . args = arguments [ 0 ] } // otherwise create args as empty object else { <mask> . args = { } // if there are arguments then they must be string property names if ( numArgs > 0 ) { // create properties instance . args . properties = [ ] // check that all args are strings for ( var i = 0 ; i < numArgs ; i ++ ) { assert ( typeof arguments [ i ] === 'string' , 'invalid argument ' + arguments [ i ] ) // add argument to list of properties instance . args . properties [ i ] = arguments [ i ] } } } // set modelViewInstanceId on instance setModelViewInstanceId ( instance ) // set class properties instance . class = 'ImmutableCoreModelViewInstance' instance . ImmutableCoreModelViewInstance = true // return instance object return instance }