mtl-js-sdk/lib/common/builder.js

"use strict";

function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }

define(['./utils'], function (utils) {
  /**
   * 重载 obj[key] 的 getter 使其返回 value
   */
  function clobber(obj, key, value) {
    var needsProperty = false;

    try {
      obj[key] = value;
    } catch (e) {
      needsProperty = true;
    }

    if (needsProperty || obj[key] !== value) {
      utils.defineGetter(obj, key, function () {
        return value;
      });
    }
  }
  /**
   * 递归合并 src 的属性到 target 中，target 中已存在的属性会被覆盖。
   */


  function recursiveMerge(target, src) {
    for (var prop in src) {
      if (src.hasOwnProperty(prop)) {
        if (target.prototype && target.prototype.constructor === target) {
          clobber(target.prototype, prop, src[prop]);
        } else {
          if (_typeof(src[prop]) === 'object' && _typeof(target[prop]) === 'object') {
            recursiveMerge(target[prop], src[prop]);
          } else {
            clobber(target, prop, src[prop]);
          }
        }
      }
    }
  }

  var builder = {};
  builder.recursiveMerge = recursiveMerge;
  builder.assignGetter = clobber;
  return builder;
});