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161 lines
2.9 KiB
161 lines
2.9 KiB
/*!
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* copy-to - index.js
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* Copyright(c) 2014 dead_horse <dead_horse@qq.com>
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* MIT Licensed
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*/
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'use strict';
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/**
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* slice() reference.
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*/
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var slice = Array.prototype.slice;
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/**
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* Expose copy
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*
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* ```
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* copy({foo: 'nar', hello: 'copy'}).to({hello: 'world'});
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* copy({foo: 'nar', hello: 'copy'}).toCover({hello: 'world'});
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* ```
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*
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* @param {Object} src
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* @return {Copy}
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*/
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module.exports = Copy;
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/**
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* Copy
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* @param {Object} src
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* @param {Boolean} withAccess
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*/
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function Copy(src, withAccess) {
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if (!(this instanceof Copy)) return new Copy(src, withAccess);
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this.src = src;
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this._withAccess = withAccess;
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}
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/**
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* copy properties include getter and setter
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* @param {[type]} val [description]
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* @return {[type]} [description]
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*/
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Copy.prototype.withAccess = function (w) {
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this._withAccess = w !== false;
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return this;
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};
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/**
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* pick keys in src
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*
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* @api: public
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*/
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Copy.prototype.pick = function(keys) {
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if (!Array.isArray(keys)) {
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keys = slice.call(arguments);
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}
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if (keys.length) {
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this.keys = keys;
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}
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return this;
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};
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/**
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* copy src to target,
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* do not cover any property target has
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* @param {Object} to
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*
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* @api: public
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*/
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Copy.prototype.to = function(to) {
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to = to || {};
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if (!this.src) return to;
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var keys = this.keys || Object.keys(this.src);
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if (!this._withAccess) {
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for (var i = 0; i < keys.length; i++) {
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key = keys[i];
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if (to[key] !== undefined) continue;
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to[key] = this.src[key];
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}
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return to;
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}
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for (var i = 0; i < keys.length; i++) {
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var key = keys[i];
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if (!notDefined(to, key)) continue;
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var getter = this.src.__lookupGetter__(key);
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var setter = this.src.__lookupSetter__(key);
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if (getter) to.__defineGetter__(key, getter);
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if (setter) to.__defineSetter__(key, setter);
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if (!getter && !setter) {
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to[key] = this.src[key];
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}
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}
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return to;
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};
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/**
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* copy src to target,
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* override any property target has
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* @param {Object} to
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*
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* @api: public
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*/
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Copy.prototype.toCover = function(to) {
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var keys = this.keys || Object.keys(this.src);
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for (var i = 0; i < keys.length; i++) {
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var key = keys[i];
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delete to[key];
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var getter = this.src.__lookupGetter__(key);
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var setter = this.src.__lookupSetter__(key);
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if (getter) to.__defineGetter__(key, getter);
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if (setter) to.__defineSetter__(key, setter);
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if (!getter && !setter) {
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to[key] = this.src[key];
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}
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}
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};
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Copy.prototype.override = Copy.prototype.toCover;
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/**
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* append another object to src
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* @param {Obj} obj
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* @return {Copy}
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*/
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Copy.prototype.and = function (obj) {
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var src = {};
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this.to(src);
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this.src = obj;
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this.to(src);
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this.src = src;
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return this;
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};
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/**
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* check obj[key] if not defiend
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* @param {Object} obj
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* @param {String} key
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* @return {Boolean}
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*/
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function notDefined(obj, key) {
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return obj[key] === undefined
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&& obj.__lookupGetter__(key) === undefined
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&& obj.__lookupSetter__(key) === undefined;
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}
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