141 lines
4.1 KiB
JavaScript
141 lines
4.1 KiB
JavaScript
// Copyright 2017-2020 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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/* eslint-disable */
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// This file was taken from Backbone and then modified. It does not conform to this
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// project's standards.
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(function () {
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'use strict';
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// Note: this is all the code required to customize Backbone's trigger() method to make
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// it resilient to exceptions thrown by event handlers. Indentation and code styles
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// were kept inline with the Backbone implementation for easier diffs.
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// The changes are:
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// 1. added 'name' parameter to triggerEvents to give it access to the
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// current event name
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// 2. added try/catch handlers to triggerEvents with error logging inside
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// every while loop
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// And of course, we update the protoypes of Backbone.Model/Backbone.View as well as
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// Backbone.Events itself
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const arr = [];
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const slice = arr.slice;
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// Regular expression used to split event strings.
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const eventSplitter = /\s+/;
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// Implement fancy features of the Events API such as multiple event
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// names `"change blur"` and jQuery-style event maps `{change: action}`
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// in terms of the existing API.
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const eventsApi = function (obj, action, name, rest) {
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if (!name) return true;
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// Handle event maps.
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if (typeof name === 'object') {
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for (const key in name) {
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obj[action](...[key, name[key]].concat(rest));
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}
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return false;
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}
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// Handle space separated event names.
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if (eventSplitter.test(name)) {
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const names = name.split(eventSplitter);
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for (let i = 0, l = names.length; i < l; i++) {
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obj[action](...[names[i]].concat(rest));
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}
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return false;
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}
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return true;
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};
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// A difficult-to-believe, but optimized internal dispatch function for
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// triggering events. Tries to keep the usual cases speedy (most internal
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// Backbone events have 3 arguments).
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const triggerEvents = function (events, name, args) {
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let ev,
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i = -1,
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l = events.length,
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a1 = args[0],
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a2 = args[1],
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a3 = args[2];
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const logError = function (error) {
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window.log.error(
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'Model caught error triggering',
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name,
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'event:',
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error && error.stack ? error.stack : error
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);
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};
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switch (args.length) {
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case 0:
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while (++i < l) {
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try {
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(ev = events[i]).callback.call(ev.ctx);
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} catch (error) {
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logError(error);
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}
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}
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return;
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case 1:
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while (++i < l) {
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try {
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(ev = events[i]).callback.call(ev.ctx, a1);
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} catch (error) {
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logError(error);
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}
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}
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return;
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case 2:
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while (++i < l) {
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try {
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(ev = events[i]).callback.call(ev.ctx, a1, a2);
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} catch (error) {
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logError(error);
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}
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}
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return;
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case 3:
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while (++i < l) {
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try {
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(ev = events[i]).callback.call(ev.ctx, a1, a2, a3);
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} catch (error) {
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logError(error);
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}
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}
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return;
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default:
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while (++i < l) {
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try {
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(ev = events[i]).callback.apply(ev.ctx, args);
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} catch (error) {
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logError(error);
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}
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}
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}
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};
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// Trigger one or many events, firing all bound callbacks. Callbacks are
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// passed the same arguments as `trigger` is, apart from the event name
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// (unless you're listening on `"all"`, which will cause your callback to
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// receive the true name of the event as the first argument).
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function trigger(name) {
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if (!this._events) return this;
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const args = slice.call(arguments, 1);
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if (!eventsApi(this, 'trigger', name, args)) return this;
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const events = this._events[name];
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const allEvents = this._events.all;
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if (events) triggerEvents(events, name, args);
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if (allEvents) triggerEvents(allEvents, name, arguments);
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return this;
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}
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Backbone.Model.prototype.trigger = Backbone.View.prototype.trigger = Backbone.Collection.prototype.trigger = Backbone.Events.trigger = trigger;
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})();
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