371 lines
8 KiB
JavaScript
Executable file
371 lines
8 KiB
JavaScript
Executable file
'use strict';
|
|
|
|
var util = require('util');
|
|
var union = require('arr-union');
|
|
var define = require('define-property');
|
|
var staticExtend = require('static-extend');
|
|
var isObj = require('isobject');
|
|
|
|
/**
|
|
* Expose class utils
|
|
*/
|
|
|
|
var cu = module.exports;
|
|
|
|
/**
|
|
* Expose class utils: `cu`
|
|
*/
|
|
|
|
cu.isObject = function isObject(val) {
|
|
return isObj(val) || typeof val === 'function';
|
|
};
|
|
|
|
/**
|
|
* Returns true if an array has any of the given elements, or an
|
|
* object has any of the give keys.
|
|
*
|
|
* ```js
|
|
* cu.has(['a', 'b', 'c'], 'c');
|
|
* //=> true
|
|
*
|
|
* cu.has(['a', 'b', 'c'], ['c', 'z']);
|
|
* //=> true
|
|
*
|
|
* cu.has({a: 'b', c: 'd'}, ['c', 'z']);
|
|
* //=> true
|
|
* ```
|
|
* @param {Object} `obj`
|
|
* @param {String|Array} `val`
|
|
* @return {Boolean}
|
|
* @api public
|
|
*/
|
|
|
|
cu.has = function has(obj, val) {
|
|
val = cu.arrayify(val);
|
|
var len = val.length;
|
|
|
|
if (cu.isObject(obj)) {
|
|
for (var key in obj) {
|
|
if (val.indexOf(key) > -1) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
var keys = cu.nativeKeys(obj);
|
|
return cu.has(keys, val);
|
|
}
|
|
|
|
if (Array.isArray(obj)) {
|
|
var arr = obj;
|
|
while (len--) {
|
|
if (arr.indexOf(val[len]) > -1) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
throw new TypeError('expected an array or object.');
|
|
};
|
|
|
|
/**
|
|
* Returns true if an array or object has all of the given values.
|
|
*
|
|
* ```js
|
|
* cu.hasAll(['a', 'b', 'c'], 'c');
|
|
* //=> true
|
|
*
|
|
* cu.hasAll(['a', 'b', 'c'], ['c', 'z']);
|
|
* //=> false
|
|
*
|
|
* cu.hasAll({a: 'b', c: 'd'}, ['c', 'z']);
|
|
* //=> false
|
|
* ```
|
|
* @param {Object|Array} `val`
|
|
* @param {String|Array} `values`
|
|
* @return {Boolean}
|
|
* @api public
|
|
*/
|
|
|
|
cu.hasAll = function hasAll(val, values) {
|
|
values = cu.arrayify(values);
|
|
var len = values.length;
|
|
while (len--) {
|
|
if (!cu.has(val, values[len])) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
};
|
|
|
|
/**
|
|
* Cast the given value to an array.
|
|
*
|
|
* ```js
|
|
* cu.arrayify('foo');
|
|
* //=> ['foo']
|
|
*
|
|
* cu.arrayify(['foo']);
|
|
* //=> ['foo']
|
|
* ```
|
|
*
|
|
* @param {String|Array} `val`
|
|
* @return {Array}
|
|
* @api public
|
|
*/
|
|
|
|
cu.arrayify = function arrayify(val) {
|
|
return val ? (Array.isArray(val) ? val : [val]) : [];
|
|
};
|
|
|
|
/**
|
|
* Noop
|
|
*/
|
|
|
|
cu.noop = function noop() {
|
|
return;
|
|
};
|
|
|
|
/**
|
|
* Returns the first argument passed to the function.
|
|
*/
|
|
|
|
cu.identity = function identity(val) {
|
|
return val;
|
|
};
|
|
|
|
/**
|
|
* Returns true if a value has a `contructor`
|
|
*
|
|
* ```js
|
|
* cu.hasConstructor({});
|
|
* //=> true
|
|
*
|
|
* cu.hasConstructor(Object.create(null));
|
|
* //=> false
|
|
* ```
|
|
* @param {Object} `value`
|
|
* @return {Boolean}
|
|
* @api public
|
|
*/
|
|
|
|
cu.hasConstructor = function hasConstructor(val) {
|
|
return cu.isObject(val) && typeof val.constructor !== 'undefined';
|
|
};
|
|
|
|
/**
|
|
* Get the native `ownPropertyNames` from the constructor of the
|
|
* given `object`. An empty array is returned if the object does
|
|
* not have a constructor.
|
|
*
|
|
* ```js
|
|
* cu.nativeKeys({a: 'b', b: 'c', c: 'd'})
|
|
* //=> ['a', 'b', 'c']
|
|
*
|
|
* cu.nativeKeys(function(){})
|
|
* //=> ['length', 'caller']
|
|
* ```
|
|
*
|
|
* @param {Object} `obj` Object that has a `constructor`.
|
|
* @return {Array} Array of keys.
|
|
* @api public
|
|
*/
|
|
|
|
cu.nativeKeys = function nativeKeys(val) {
|
|
if (!cu.hasConstructor(val)) return [];
|
|
var keys = Object.getOwnPropertyNames(val);
|
|
if ('caller' in val) keys.push('caller');
|
|
return keys;
|
|
};
|
|
|
|
/**
|
|
* Returns property descriptor `key` if it's an "own" property
|
|
* of the given object.
|
|
*
|
|
* ```js
|
|
* function App() {}
|
|
* Object.defineProperty(App.prototype, 'count', {
|
|
* get: function() {
|
|
* return Object.keys(this).length;
|
|
* }
|
|
* });
|
|
* cu.getDescriptor(App.prototype, 'count');
|
|
* // returns:
|
|
* // {
|
|
* // get: [Function],
|
|
* // set: undefined,
|
|
* // enumerable: false,
|
|
* // configurable: false
|
|
* // }
|
|
* ```
|
|
*
|
|
* @param {Object} `obj`
|
|
* @param {String} `key`
|
|
* @return {Object} Returns descriptor `key`
|
|
* @api public
|
|
*/
|
|
|
|
cu.getDescriptor = function getDescriptor(obj, key) {
|
|
if (!cu.isObject(obj)) {
|
|
throw new TypeError('expected an object.');
|
|
}
|
|
if (typeof key !== 'string') {
|
|
throw new TypeError('expected key to be a string.');
|
|
}
|
|
return Object.getOwnPropertyDescriptor(obj, key);
|
|
};
|
|
|
|
/**
|
|
* Copy a descriptor from one object to another.
|
|
*
|
|
* ```js
|
|
* function App() {}
|
|
* Object.defineProperty(App.prototype, 'count', {
|
|
* get: function() {
|
|
* return Object.keys(this).length;
|
|
* }
|
|
* });
|
|
* var obj = {};
|
|
* cu.copyDescriptor(obj, App.prototype, 'count');
|
|
* ```
|
|
* @param {Object} `receiver`
|
|
* @param {Object} `provider`
|
|
* @param {String} `name`
|
|
* @return {Object}
|
|
* @api public
|
|
*/
|
|
|
|
cu.copyDescriptor = function copyDescriptor(receiver, provider, name) {
|
|
if (!cu.isObject(receiver)) {
|
|
throw new TypeError('expected receiving object to be an object.');
|
|
}
|
|
if (!cu.isObject(provider)) {
|
|
throw new TypeError('expected providing object to be an object.');
|
|
}
|
|
if (typeof name !== 'string') {
|
|
throw new TypeError('expected name to be a string.');
|
|
}
|
|
|
|
var val = cu.getDescriptor(provider, name);
|
|
if (val) Object.defineProperty(receiver, name, val);
|
|
};
|
|
|
|
/**
|
|
* Copy static properties, prototype properties, and descriptors
|
|
* from one object to another.
|
|
*
|
|
* @param {Object} `receiver`
|
|
* @param {Object} `provider`
|
|
* @param {String|Array} `omit` One or more properties to omit
|
|
* @return {Object}
|
|
* @api public
|
|
*/
|
|
|
|
cu.copy = function copy(receiver, provider, omit) {
|
|
if (!cu.isObject(receiver)) {
|
|
throw new TypeError('expected receiving object to be an object.');
|
|
}
|
|
if (!cu.isObject(provider)) {
|
|
throw new TypeError('expected providing object to be an object.');
|
|
}
|
|
var props = Object.getOwnPropertyNames(provider);
|
|
var keys = Object.keys(provider);
|
|
var len = props.length,
|
|
key;
|
|
omit = cu.arrayify(omit);
|
|
|
|
while (len--) {
|
|
key = props[len];
|
|
|
|
if (cu.has(keys, key)) {
|
|
define(receiver, key, provider[key]);
|
|
} else if (!(key in receiver) && !cu.has(omit, key)) {
|
|
cu.copyDescriptor(receiver, provider, key);
|
|
}
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Inherit the static properties, prototype properties, and descriptors
|
|
* from of an object.
|
|
*
|
|
* @param {Object} `receiver`
|
|
* @param {Object} `provider`
|
|
* @param {String|Array} `omit` One or more properties to omit
|
|
* @return {Object}
|
|
* @api public
|
|
*/
|
|
|
|
cu.inherit = function inherit(receiver, provider, omit) {
|
|
if (!cu.isObject(receiver)) {
|
|
throw new TypeError('expected receiving object to be an object.');
|
|
}
|
|
if (!cu.isObject(provider)) {
|
|
throw new TypeError('expected providing object to be an object.');
|
|
}
|
|
|
|
var keys = [];
|
|
for (var key in provider) {
|
|
keys.push(key);
|
|
receiver[key] = provider[key];
|
|
}
|
|
|
|
keys = keys.concat(cu.arrayify(omit));
|
|
|
|
var a = provider.prototype || provider;
|
|
var b = receiver.prototype || receiver;
|
|
cu.copy(b, a, keys);
|
|
};
|
|
|
|
/**
|
|
* Returns a function for extending the static properties,
|
|
* prototype properties, and descriptors from the `Parent`
|
|
* constructor onto `Child` constructors.
|
|
*
|
|
* ```js
|
|
* var extend = cu.extend(Parent);
|
|
* Parent.extend(Child);
|
|
*
|
|
* // optional methods
|
|
* Parent.extend(Child, {
|
|
* foo: function() {},
|
|
* bar: function() {}
|
|
* });
|
|
* ```
|
|
* @param {Function} `Parent` Parent ctor
|
|
* @param {Function} `extend` Optional extend function to handle custom extensions. Useful when updating methods that require a specific prototype.
|
|
* @param {Function} `Child` Child ctor
|
|
* @param {Object} `proto` Optionally pass additional prototype properties to inherit.
|
|
* @return {Object}
|
|
* @api public
|
|
*/
|
|
|
|
cu.extend = function() {
|
|
// keep it lazy, instead of assigning to `cu.extend`
|
|
return staticExtend.apply(null, arguments);
|
|
};
|
|
|
|
/**
|
|
* Bubble up events emitted from static methods on the Parent ctor.
|
|
*
|
|
* @param {Object} `Parent`
|
|
* @param {Array} `events` Event names to bubble up
|
|
* @api public
|
|
*/
|
|
|
|
cu.bubble = function(Parent, events) {
|
|
events = events || [];
|
|
Parent.bubble = function(Child, arr) {
|
|
if (Array.isArray(arr)) {
|
|
events = union([], events, arr);
|
|
}
|
|
var len = events.length;
|
|
var idx = -1;
|
|
while (++idx < len) {
|
|
var name = events[idx];
|
|
Parent.on(name, Child.emit.bind(Child, name));
|
|
}
|
|
cu.bubble(Child, events);
|
|
};
|
|
};
|