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| /*
* @Author: Dalegac
* @Date: 2021-09-30 14:28:05
* @LastEditTime: 2021-10-04 10:11:43
* @LastEditors: Dalegac
* @Description: Just say something
*/
// 可继续遍历的数据类型
const mapTag = "[object Map]";
const setTag = "[object Set]";
const arrayTag = "[object Array]";
const objectTag = "[object Object]";
const argsTag = "[object Arguments]";
// 不可继续遍历的数据类型
const boolTag = "[object Boolean]";
const dateTag = "[object Date]";
const numberTag = "[object Number]";
const stringTag = "[object String]";
const symbolTag = "[object Symbol]";
const bigintTag = "[object BigInt]";
const errorTag = "[object Error]";
const regexpTag = "[object RegExp]";
const funcTag = "[object Function]";
const deepTag = [mapTag, setTag, arrayTag, objectTag, argsTag];
/**
* @description: 工具函数 - 通用while循环
* @param {Array}array 待遍历数组
* @param {Function}iteratee 执行函数
* @return {Array}
*/
function forEach(array, iteratee) {
let index = -1;
const length = array.length;
while (++index < length) {
iteratee(array[index], index);
}
return array;
}
/**
* @description: 工具函数 - 判断是否为引用类型
* @param {Any} target
* @return {Boolean} 是否是引用类型
*/
function isObject(target) {
const type = typeof target;
return target !== null && (type === "object" || type === "function");
}
/**
* @description: 工具函数 - 获取实际类型
* @param {Any} target
* @return {String} 格式化类型
*/
function getType(target) {
return Object.prototype.toString.call(target);
}
/**
* @description:工具函数 - 初始化被克隆函数
* @param {Any} target
* @return {*}
*/
function getInit(target) {
const Ctor = target.constructor;
return new Ctor();
}
/**
* @description: 工具函数 - 克隆Symbol
* @param {Symbol}
* @return {*}
*/
function cloneSymbol(target) {
return Object(Symbol.prototype.valueOf.call(target));
}
/**
* @description: 工具函数 - 克隆正则
* @param {Regexp} target
* @return {*}
*/
function cloneReg(target) {
const { source, flags, lastIndex } = target;
const result = new RegExp(source, flags);
result.lastIndex = lastIndex;
return result;
}
/**
* @description: 工具函数 - 克隆函数
* @param {Function} target
* @return {*}
*/
function cloneFunction(target) {
const bodyReg = /(?<={).+(?=})/ms;
const paramReg = /(?<=\().+(?=\)\s+{)/;
const funcString = target.toString();
if (target.prototype) {
const param = paramReg.exec(funcString);
const body = bodyReg.exec(funcString);
if (body) {
if (param) {
const paramArr = param[0].split(",");
return new Function(...paramArr, body[0]);
} else {
return new Function(body[0]);
}
} else {
return null;
}
} else {
return eval(funcString);
}
}
/**
* @description: 工具函数 - 克隆不可遍历类型
* @param {Any} target 被克隆对象
* @param {String} type 对象类型
* @return {*}
*/
function cloneOtherType(target, type) {
const Ctor = target.constructor;
switch (type) {
case boolTag:
case numberTag:
case stringTag:
case bigintTag:
case errorTag:
case dateTag:
return new Ctor(target);
case regexpTag:
return cloneReg(target);
case symbolTag:
return cloneSymbol(target);
case funcTag:
return cloneFunction(target);
default:
return null;
}
}
/**
* @description: 克隆函数
* @param {Any} target 被克隆对象
* @param {WeakMap} map 引用对象缓存池
* @return {*}
*/
function clone(target, map = new WeakMap()) {
// 克隆原始类型
if (!isObject(target)) {
return target;
}
// 初始化
const type = getType(target);
let cloneTarget;
if (deepTag.includes(type)) {
cloneTarget = getInit(target);
} else {
return cloneOtherType(target, type);
}
// 防止循环引用
if (map.get(target)) {
return map.get(target);
}
map.set(target, cloneTarget);
// 克隆set
if (type === setTag) {
target.forEach((value) => {
cloneTarget.add(clone(value, map));
});
return cloneTarget;
}
// 克隆map
if (type === mapTag) {
target.forEach((value, key) => {
cloneTarget.set(key, clone(value, map));
});
return cloneTarget;
}
// 克隆对象和数组
const keys = type === arrayTag ? undefined : Object.keys(target);
forEach(keys || target, (value, key) => {
if (keys) {
key = value;
}
cloneTarget[key] = clone(target[key], map);
});
return cloneTarget;
}
module.exports = { clone };
|
