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author | Florian Dold <florian.dold@gmail.com> | 2017-08-14 05:01:11 +0200 |
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committer | Florian Dold <florian.dold@gmail.com> | 2017-08-14 05:02:09 +0200 |
commit | 363723fc84f7b8477592e0105aeb331ec9a017af (patch) | |
tree | 29f92724f34131bac64d6a318dd7e30612e631c7 /node_modules/class-utils/index.js | |
parent | 5634e77ad96bfe1818f6b6ee70b7379652e5487f (diff) | |
download | wallet-core-363723fc84f7b8477592e0105aeb331ec9a017af.tar.xz |
node_modules
Diffstat (limited to 'node_modules/class-utils/index.js')
-rw-r--r-- | node_modules/class-utils/index.js | 365 |
1 files changed, 365 insertions, 0 deletions
diff --git a/node_modules/class-utils/index.js b/node_modules/class-utils/index.js new file mode 100644 index 000000000..f14ea0496 --- /dev/null +++ b/node_modules/class-utils/index.js @@ -0,0 +1,365 @@ +'use strict'; + +var util = require('util'); +var utils = require('./utils'); + +/** + * Expose class utils + */ + +var cu = module.exports; + +/** + * Expose class utils: `cu` + */ + +cu.isObject = function isObject(val) { + return utils.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 []; + return Object.getOwnPropertyNames(val); +}; + +/** + * 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)) { + utils.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 utils.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 = utils.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); + }; +}; |