83 lines
2.2 KiB
JavaScript
83 lines
2.2 KiB
JavaScript
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/*!
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* lunr.EventEmitter
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* Copyright (C) @YEAR Oliver Nightingale
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*/
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/**
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* lunr.EventEmitter is an event emitter for lunr. It manages adding and removing event handlers and triggering events and their handlers.
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*
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* @constructor
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*/
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lunr.EventEmitter = function () {
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this.events = {}
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}
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/**
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* Binds a handler function to a specific event(s).
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*
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* Can bind a single function to many different events in one call.
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*
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* @param {String} [eventName] The name(s) of events to bind this function to.
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* @param {Function} fn The function to call when an event is fired.
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* @memberOf EventEmitter
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*/
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lunr.EventEmitter.prototype.addListener = function () {
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var args = Array.prototype.slice.call(arguments),
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fn = args.pop(),
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names = args
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if (typeof fn !== "function") throw new TypeError ("last argument must be a function")
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names.forEach(function (name) {
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if (!this.hasHandler(name)) this.events[name] = []
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this.events[name].push(fn)
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}, this)
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}
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/**
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* Removes a handler function from a specific event.
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*
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* @param {String} eventName The name of the event to remove this function from.
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* @param {Function} fn The function to remove from an event.
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* @memberOf EventEmitter
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*/
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lunr.EventEmitter.prototype.removeListener = function (name, fn) {
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if (!this.hasHandler(name)) return
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var fnIndex = this.events[name].indexOf(fn)
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this.events[name].splice(fnIndex, 1)
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if (!this.events[name].length) delete this.events[name]
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}
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/**
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* Calls all functions bound to the given event.
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*
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* Additional data can be passed to the event handler as arguments to `emit`
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* after the event name.
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*
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* @param {String} eventName The name of the event to emit.
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* @memberOf EventEmitter
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*/
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lunr.EventEmitter.prototype.emit = function (name) {
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if (!this.hasHandler(name)) return
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var args = Array.prototype.slice.call(arguments, 1)
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this.events[name].forEach(function (fn) {
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fn.apply(undefined, args)
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})
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}
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/**
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* Checks whether a handler has ever been stored against an event.
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*
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* @param {String} eventName The name of the event to check.
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* @private
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* @memberOf EventEmitter
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*/
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lunr.EventEmitter.prototype.hasHandler = function (name) {
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return name in this.events
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}
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