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