AngularJS: Extend $parse to use getter/setter

HTML

<script src="http://code.angularjs.org/0.10.6/angular-0.10.6.js"></script>
<div ng:app="my" ng:controller="Main">
  <input type="text" ng:model="child">
</div>

JavaScript

angular.module('my', [], function($provide) {
  // decorate - wrap $parse to understand jQuery text() getter/setter
  $provide.decorator('$parse', function($delegate) {
    return function(expression) {
      var parsed = $delegate(expression);

      // getter
      var wrapper = function(scope, locals) {
        var val = parsed(scope, locals);
        return val && angular.isFunction(val.text) ? val.text() : val;
      };

      // setter
      wrapper.assign = function(scope, value) {
        var val = parsed(scope);
        return val && angular.isFunction(val.text) ? val.text(value) : parsed.assign(scope, value);
      };

      return wrapper;
    };
  });
});
    
var Main = function() {
  // some xml structure, reference on window for debugging
  var xml = window.xml = $('<some><child></child><child-2></child-2></some>');
  this.child = xml.find('child');
};