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Diffstat (limited to 'node_modules/mocha/lib/browser/events.js')
-rw-r--r-- | node_modules/mocha/lib/browser/events.js | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/node_modules/mocha/lib/browser/events.js b/node_modules/mocha/lib/browser/events.js new file mode 100644 index 000000000..b4342f620 --- /dev/null +++ b/node_modules/mocha/lib/browser/events.js @@ -0,0 +1,193 @@ +/** + * Module exports. + */ + +exports.EventEmitter = EventEmitter; + +/** + * Object#toString reference. + */ +var objToString = Object.prototype.toString; + +/** + * Check if a value is an array. + * + * @api private + * @param {*} val The value to test. + * @return {boolean} true if the value is an array, otherwise false. + */ +function isArray(val) { + return objToString.call(val) === '[object Array]'; +} + +/** + * Event emitter constructor. + * + * @api public + */ +function EventEmitter() {} + +/** + * Add a listener. + * + * @api public + * @param {string} name Event name. + * @param {Function} fn Event handler. + * @return {EventEmitter} Emitter instance. + */ +EventEmitter.prototype.on = function(name, fn) { + if (!this.$events) { + this.$events = {}; + } + + if (!this.$events[name]) { + this.$events[name] = fn; + } else if (isArray(this.$events[name])) { + this.$events[name].push(fn); + } else { + this.$events[name] = [this.$events[name], fn]; + } + + return this; +}; + +EventEmitter.prototype.addListener = EventEmitter.prototype.on; + +/** + * Adds a volatile listener. + * + * @api public + * @param {string} name Event name. + * @param {Function} fn Event handler. + * @return {EventEmitter} Emitter instance. + */ +EventEmitter.prototype.once = function(name, fn) { + var self = this; + + function on() { + self.removeListener(name, on); + fn.apply(this, arguments); + } + + on.listener = fn; + this.on(name, on); + + return this; +}; + +/** + * Remove a listener. + * + * @api public + * @param {string} name Event name. + * @param {Function} fn Event handler. + * @return {EventEmitter} Emitter instance. + */ +EventEmitter.prototype.removeListener = function(name, fn) { + if (this.$events && this.$events[name]) { + var list = this.$events[name]; + + if (isArray(list)) { + var pos = -1; + + for (var i = 0, l = list.length; i < l; i++) { + if (list[i] === fn || (list[i].listener && list[i].listener === fn)) { + pos = i; + break; + } + } + + if (pos < 0) { + return this; + } + + list.splice(pos, 1); + + if (!list.length) { + delete this.$events[name]; + } + } else if (list === fn || (list.listener && list.listener === fn)) { + delete this.$events[name]; + } + } + + return this; +}; + +/** + * Remove all listeners for an event. + * + * @api public + * @param {string} name Event name. + * @return {EventEmitter} Emitter instance. + */ +EventEmitter.prototype.removeAllListeners = function(name) { + if (name === undefined) { + this.$events = {}; + return this; + } + + if (this.$events && this.$events[name]) { + this.$events[name] = null; + } + + return this; +}; + +/** + * Get all listeners for a given event. + * + * @api public + * @param {string} name Event name. + * @return {EventEmitter} Emitter instance. + */ +EventEmitter.prototype.listeners = function(name) { + if (!this.$events) { + this.$events = {}; + } + + if (!this.$events[name]) { + this.$events[name] = []; + } + + if (!isArray(this.$events[name])) { + this.$events[name] = [this.$events[name]]; + } + + return this.$events[name]; +}; + +/** + * Emit an event. + * + * @api public + * @param {string} name Event name. + * @return {boolean} true if at least one handler was invoked, else false. + */ +EventEmitter.prototype.emit = function(name) { + if (!this.$events) { + return false; + } + + var handler = this.$events[name]; + + if (!handler) { + return false; + } + + var args = Array.prototype.slice.call(arguments, 1); + + if (typeof handler === 'function') { + handler.apply(this, args); + } else if (isArray(handler)) { + var listeners = handler.slice(); + + for (var i = 0, l = listeners.length; i < l; i++) { + listeners[i].apply(this, args); + } + } else { + return false; + } + + return true; +}; |