uisRepeatParserService.js

/**
 * Parses "repeat" attribute.
 *
 * Taken from AngularJS ngRepeat source code
 * See https://github.com/angular/angular.js/blob/v1.2.15/src/ng/directive/ngRepeat.js#L211
 *
 * Original discussion about parsing "repeat" attribute instead of fully relying on ng-repeat:
 * https://github.com/angular-ui/ui-select/commit/5dd63ad#commitcomment-5504697
 */

uis.service('uisRepeatParser', ['uiSelectMinErr','$parse', function(uiSelectMinErr, $parse) {
  var self = this;

  /**
   * Example:
   * expression = "address in addresses | filter: {street: $select.search} track by $index"
   * itemName = "address",
   * source = "addresses | filter: {street: $select.search}",
   * trackByExp = "$index",
   */
  self.parse = function(expression) {


    var match;
    var isObjectCollection = /\(\s*([\$\w][\$\w]*)\s*,\s*([\$\w][\$\w]*)\s*\)/.test(expression);
    // If an array is used as collection

    // if (isObjectCollection){
      //00000000000000000000000000000111111111000000000000000222222222222220033333333333333333333330000444444444444444444000000000000000556666660000077777777777755000000000000000000000088888880000000
    match = expression.match(/^\s*(?:([\s\S]+?)\s+as\s+)?(?:([\$\w][\$\w]*)|(?:\(\s*([\$\w][\$\w]*)\s*,\s*([\$\w][\$\w]*)\s*\)))\s+in\s+(([\w]+)?\s*(|\s*[\s\S]+?))?(?:\s+track\s+by\s+([\s\S]+?))?\s*$/);      

    // 1 Alias
    // 2 Item
    // 3 Key on (key,value)
    // 4 Value on (key,value)
    // 5 Collection expresion (only used when using an array collection)
    // 6 Object that will be converted to Array when using (key,value) syntax
    // 7 Filters that will be applied to #6 when using (key,value) syntax
    // 8 Track by

    if (!match) {
      throw uiSelectMinErr('iexp', "Expected expression in form of '_item_ in _collection_[ track by _id_]' but got '{0}'.",
              expression);
    }
    if (!match[6] && isObjectCollection) {
      throw uiSelectMinErr('iexp', "Expected expression in form of '_item_ as (_key_, _item_) in _ObjCollection_ [ track by _id_]' but got '{0}'.",
              expression);
    }

    return {
      itemName: match[4] || match[2], // (lhs) Left-hand side,
      keyName: match[3], //for (key, value) syntax
      source: $parse(!match[3] ? match[5] : match[6]),
      sourceName: match[6],
      filters: match[7],
      trackByExp: match[8],
      modelMapper: $parse(match[1] || match[4] || match[2]),
      repeatExpression: function (grouped) {
        var expression = this.itemName + ' in ' + (grouped ? '$group.items' : '$select.items');
        if (this.trackByExp) {
          expression += ' track by ' + this.trackByExp;
        }
        return expression;
      } 
    };

  };

  self.getGroupNgRepeatExpression = function() {
    return '$group in $select.groups';
  };

}]);