You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
162 lines
2.9 KiB
162 lines
2.9 KiB
/*!
|
|
* 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;
|
|
}
|