• 设为首页
  • 点击收藏
  • 手机版
    手机扫一扫访问
    迪恩网络手机版
  • 关注官方公众号
    微信扫一扫关注
    公众号

TypeScript utils.lookupDescriptor函数代码示例

原作者: [db:作者] 来自: [db:来源] 收藏 邀请

本文整理汇总了TypeScript中@ember/-internals/utils.lookupDescriptor函数的典型用法代码示例。如果您正苦于以下问题:TypeScript lookupDescriptor函数的具体用法?TypeScript lookupDescriptor怎么用?TypeScript lookupDescriptor使用的例子?那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。



在下文中一共展示了lookupDescriptor函数的4个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于我们的系统推荐出更棒的TypeScript代码示例。

示例1: handleMandatorySetter

  handleMandatorySetter = function handleMandatorySetter(m, obj, keyName): void {
    let descriptor = lookupDescriptor(obj, keyName);
    let hasDescriptor = descriptor !== null;
    let possibleDesc = hasDescriptor && descriptor!.value;
    if (isComputedDecorator(possibleDesc)) {
      return;
    }
    let configurable = hasDescriptor ? descriptor!.configurable : true;
    let isWritable = hasDescriptor ? descriptor!.writable : true;
    let hasValue = hasDescriptor ? 'value' in descriptor! : true;

    // this x in Y deopts, so keeping it in this function is better;
    if (configurable && isWritable && hasValue && keyName in obj) {
      let desc = {
        configurable: true,
        set: MANDATORY_SETTER_FUNCTION(keyName),
        enumerable: propertyIsEnumerable(obj, keyName),
        get: (undefined as any) as (() => any | undefined | null),
      };

      if (hasOwnProperty(obj, keyName)) {
        m.writeValues(keyName, obj[keyName]);
        desc.get = DEFAULT_GETTER_FUNCTION(keyName);
      } else {
        desc.get = INHERITING_GETTER_FUNCTION(keyName);
      }

      Object.defineProperty(obj, keyName, desc);
    }
  };
开发者ID:habdelra,项目名称:ember.js,代码行数:30,代码来源:watch_key.ts


示例2: function

  Meta.prototype.writeValue = function(obj: object, key: string, value: any) {
    let descriptor = lookupDescriptor(obj, key);
    let isMandatorySetter =
      descriptor !== null && descriptor.set && (descriptor.set as any).isMandatorySetter;

    if (isMandatorySetter) {
      this.writeValues(key, value);
    } else {
      obj[key] = value;
    }
  };
开发者ID:luxferresum,项目名称:ember.js,代码行数:11,代码来源:meta.ts


示例3: lookupDescriptor

  makeEnumerable = (obj: object, key: string) => {
    let desc = lookupDescriptor(obj, key);

    if (
      desc !== null &&
      desc.set !== undefined &&
      (desc.set as MandatorySetterFunction).isMandatorySetter
    ) {
      desc.enumerable = true;
      Object.defineProperty(obj, key, desc);
    }
  };
开发者ID:emberjs,项目名称:ember.js,代码行数:12,代码来源:property_set.ts


示例4: unwatchKey

export function unwatchKey(obj: object, keyName: string, _meta?: Meta): void {
  let meta = _meta === undefined ? peekMeta(obj) : _meta;

  // do nothing of this object has already been destroyed
  if (meta === null || meta.isSourceDestroyed()) {
    return;
  }

  let count = meta.peekWatching(keyName);
  if (count === 1) {
    meta.writeWatching(keyName, 0);

    let possibleDesc = descriptorForProperty(obj, keyName, meta);
    let isDescriptor = possibleDesc !== undefined;

    if (isDescriptor && possibleDesc.didUnwatch !== undefined) {
      possibleDesc.didUnwatch(obj, keyName, meta);
    }

    if (typeof (obj as MaybeHasDidUnwatchProperty).didUnwatchProperty === 'function') {
      (obj as MaybeHasDidUnwatchProperty).didUnwatchProperty!(keyName);
    }

    if (DEBUG) {
      // It is true, the following code looks quite WAT. But have no fear, It
      // exists purely to improve development ergonomics and is removed from
      // ember.min.js and ember.prod.js builds.
      //
      // Some further context: Once a property is watched by ember, bypassing `set`
      // for mutation, will bypass observation. This code exists to assert when
      // that occurs, and attempt to provide more helpful feedback. The alternative
      // is tricky to debug partially observable properties.
      if (!isDescriptor && keyName in obj) {
        let maybeMandatoryDescriptor = lookupDescriptor(obj, keyName);

        if (
          maybeMandatoryDescriptor &&
          maybeMandatoryDescriptor.set &&
          (maybeMandatoryDescriptor.set as MandatorySetterFunction).isMandatorySetter
        ) {
          if (
            maybeMandatoryDescriptor.get &&
            (maybeMandatoryDescriptor.get as InheritingGetterFunction).isInheritingGetter
          ) {
            let possibleValue = meta.readInheritedValue('values', keyName);
            if (possibleValue === UNDEFINED) {
              delete obj[keyName];
              return;
            }
          }

          Object.defineProperty(obj, keyName, {
            configurable: true,
            enumerable: Object.prototype.propertyIsEnumerable.call(obj, keyName),
            writable: true,
            value: meta.peekValues(keyName),
          });
          meta.deleteFromValues(keyName);
        }
      }
    }
  } else if (count > 1) {
    meta.writeWatching(keyName, count - 1);
  }
}
开发者ID:habdelra,项目名称:ember.js,代码行数:65,代码来源:watch_key.ts



注:本文中的@ember/-internals/utils.lookupDescriptor函数示例由纯净天空整理自Github/MSDocs等源码及文档管理平台,相关代码片段筛选自各路编程大神贡献的开源项目,源码版权归原作者所有,传播和使用请参考对应项目的License;未经允许,请勿转载。


鲜花

握手

雷人

路过

鸡蛋
该文章已有0人参与评论

请发表评论

全部评论

专题导读
上一篇:
TypeScript utils.setName函数代码示例发布时间:2022-05-28
下一篇:
TypeScript utils.isProxy函数代码示例发布时间:2022-05-28
热门推荐
热门话题
阅读排行榜

扫描微信二维码

查看手机版网站

随时了解更新最新资讯

139-2527-9053

在线客服(服务时间 9:00~18:00)

在线QQ客服
地址:深圳市南山区西丽大学城创智工业园
电邮:jeky_zhao#qq.com
移动电话:139-2527-9053

Powered by 互联科技 X3.4© 2001-2213 极客世界.|Sitemap