/*!
 * Chai - transferFlags utility
 * Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
 * MIT Licensed
 */

/**
 * ### transferFlags(assertion, object, includeAll = true)
 *
 * Transfer all the flags for `assertion` to `object`. If
 * `includeAll` is set to `false`, then the base Chai
 * assertion flags (namely `object`, `ssfi`, and `message`)
 * will not be transferred.
 *
 *
 *     var newAssertion = new Assertion();
 *     utils.transferFlags(assertion, newAssertion);
 *
 *     var anotherAsseriton = new Assertion(myObj);
 *     utils.transferFlags(assertion, anotherAssertion, false);
 *
 * @param {Assertion} assertion the assertion to transfer the flags from
 * @param {Object} object the object to transfer the flags to; usually a new assertion
 * @param {Boolean} includeAll
 * @name transferFlags
 * @api private
 */

module.exports = function (assertion, object, includeAll) {
  var flags = assertion.__flags || (assertion.__flags = Object.create(null));

  if (!object.__flags) {
    object.__flags = Object.create(null);
  }

  includeAll = arguments.length === 3 ? includeAll : true;

  for (var flag in flags) {
    if (includeAll ||
        (flag !== 'object' && flag !== 'ssfi' && flag != 'message')) {
      object.__flags[flag] = flags[flag];
    }
  }
};
