diff options
Diffstat (limited to 'node_modules/event-target-shim/dist/event-target-shim.mjs')
| -rw-r--r-- | node_modules/event-target-shim/dist/event-target-shim.mjs | 862 |
1 files changed, 862 insertions, 0 deletions
diff --git a/node_modules/event-target-shim/dist/event-target-shim.mjs b/node_modules/event-target-shim/dist/event-target-shim.mjs new file mode 100644 index 000000000..114f3a171 --- /dev/null +++ b/node_modules/event-target-shim/dist/event-target-shim.mjs @@ -0,0 +1,862 @@ +/** + * @author Toru Nagashima <https://github.com/mysticatea> + * @copyright 2015 Toru Nagashima. All rights reserved. + * See LICENSE file in root directory for full license. + */ +/** + * @typedef {object} PrivateData + * @property {EventTarget} eventTarget The event target. + * @property {{type:string}} event The original event object. + * @property {number} eventPhase The current event phase. + * @property {EventTarget|null} currentTarget The current event target. + * @property {boolean} canceled The flag to prevent default. + * @property {boolean} stopped The flag to stop propagation. + * @property {boolean} immediateStopped The flag to stop propagation immediately. + * @property {Function|null} passiveListener The listener if the current listener is passive. Otherwise this is null. + * @property {number} timeStamp The unix time. + * @private + */ + +/** + * Private data for event wrappers. + * @type {WeakMap<Event, PrivateData>} + * @private + */ +const privateData = new WeakMap(); + +/** + * Cache for wrapper classes. + * @type {WeakMap<Object, Function>} + * @private + */ +const wrappers = new WeakMap(); + +/** + * Get private data. + * @param {Event} event The event object to get private data. + * @returns {PrivateData} The private data of the event. + * @private + */ +function pd(event) { + const retv = privateData.get(event); + console.assert( + retv != null, + "'this' is expected an Event object, but got", + event + ); + return retv +} + +/** + * https://dom.spec.whatwg.org/#set-the-canceled-flag + * @param data {PrivateData} private data. + */ +function setCancelFlag(data) { + if (data.passiveListener != null) { + if ( + typeof console !== "undefined" && + typeof console.error === "function" + ) { + console.error( + "Unable to preventDefault inside passive event listener invocation.", + data.passiveListener + ); + } + return + } + if (!data.event.cancelable) { + return + } + + data.canceled = true; + if (typeof data.event.preventDefault === "function") { + data.event.preventDefault(); + } +} + +/** + * @see https://dom.spec.whatwg.org/#interface-event + * @private + */ +/** + * The event wrapper. + * @constructor + * @param {EventTarget} eventTarget The event target of this dispatching. + * @param {Event|{type:string}} event The original event to wrap. + */ +function Event(eventTarget, event) { + privateData.set(this, { + eventTarget, + event, + eventPhase: 2, + currentTarget: eventTarget, + canceled: false, + stopped: false, + immediateStopped: false, + passiveListener: null, + timeStamp: event.timeStamp || Date.now(), + }); + + // https://heycam.github.io/webidl/#Unforgeable + Object.defineProperty(this, "isTrusted", { value: false, enumerable: true }); + + // Define accessors + const keys = Object.keys(event); + for (let i = 0; i < keys.length; ++i) { + const key = keys[i]; + if (!(key in this)) { + Object.defineProperty(this, key, defineRedirectDescriptor(key)); + } + } +} + +// Should be enumerable, but class methods are not enumerable. +Event.prototype = { + /** + * The type of this event. + * @type {string} + */ + get type() { + return pd(this).event.type + }, + + /** + * The target of this event. + * @type {EventTarget} + */ + get target() { + return pd(this).eventTarget + }, + + /** + * The target of this event. + * @type {EventTarget} + */ + get currentTarget() { + return pd(this).currentTarget + }, + + /** + * @returns {EventTarget[]} The composed path of this event. + */ + composedPath() { + const currentTarget = pd(this).currentTarget; + if (currentTarget == null) { + return [] + } + return [currentTarget] + }, + + /** + * Constant of NONE. + * @type {number} + */ + get NONE() { + return 0 + }, + + /** + * Constant of CAPTURING_PHASE. + * @type {number} + */ + get CAPTURING_PHASE() { + return 1 + }, + + /** + * Constant of AT_TARGET. + * @type {number} + */ + get AT_TARGET() { + return 2 + }, + + /** + * Constant of BUBBLING_PHASE. + * @type {number} + */ + get BUBBLING_PHASE() { + return 3 + }, + + /** + * The target of this event. + * @type {number} + */ + get eventPhase() { + return pd(this).eventPhase + }, + + /** + * Stop event bubbling. + * @returns {void} + */ + stopPropagation() { + const data = pd(this); + + data.stopped = true; + if (typeof data.event.stopPropagation === "function") { + data.event.stopPropagation(); + } + }, + + /** + * Stop event bubbling. + * @returns {void} + */ + stopImmediatePropagation() { + const data = pd(this); + + data.stopped = true; + data.immediateStopped = true; + if (typeof data.event.stopImmediatePropagation === "function") { + data.event.stopImmediatePropagation(); + } + }, + + /** + * The flag to be bubbling. + * @type {boolean} + */ + get bubbles() { + return Boolean(pd(this).event.bubbles) + }, + + /** + * The flag to be cancelable. + * @type {boolean} + */ + get cancelable() { + return Boolean(pd(this).event.cancelable) + }, + + /** + * Cancel this event. + * @returns {void} + */ + preventDefault() { + setCancelFlag(pd(this)); + }, + + /** + * The flag to indicate cancellation state. + * @type {boolean} + */ + get defaultPrevented() { + return pd(this).canceled + }, + + /** + * The flag to be composed. + * @type {boolean} + */ + get composed() { + return Boolean(pd(this).event.composed) + }, + + /** + * The unix time of this event. + * @type {number} + */ + get timeStamp() { + return pd(this).timeStamp + }, + + /** + * The target of this event. + * @type {EventTarget} + * @deprecated + */ + get srcElement() { + return pd(this).eventTarget + }, + + /** + * The flag to stop event bubbling. + * @type {boolean} + * @deprecated + */ + get cancelBubble() { + return pd(this).stopped + }, + set cancelBubble(value) { + if (!value) { + return + } + const data = pd(this); + + data.stopped = true; + if (typeof data.event.cancelBubble === "boolean") { + data.event.cancelBubble = true; + } + }, + + /** + * The flag to indicate cancellation state. + * @type {boolean} + * @deprecated + */ + get returnValue() { + return !pd(this).canceled + }, + set returnValue(value) { + if (!value) { + setCancelFlag(pd(this)); + } + }, + + /** + * Initialize this event object. But do nothing under event dispatching. + * @param {string} type The event type. + * @param {boolean} [bubbles=false] The flag to be possible to bubble up. + * @param {boolean} [cancelable=false] The flag to be possible to cancel. + * @deprecated + */ + initEvent() { + // Do nothing. + }, +}; + +// `constructor` is not enumerable. +Object.defineProperty(Event.prototype, "constructor", { + value: Event, + configurable: true, + writable: true, +}); + +// Ensure `event instanceof window.Event` is `true`. +if (typeof window !== "undefined" && typeof window.Event !== "undefined") { + Object.setPrototypeOf(Event.prototype, window.Event.prototype); + + // Make association for wrappers. + wrappers.set(window.Event.prototype, Event); +} + +/** + * Get the property descriptor to redirect a given property. + * @param {string} key Property name to define property descriptor. + * @returns {PropertyDescriptor} The property descriptor to redirect the property. + * @private + */ +function defineRedirectDescriptor(key) { + return { + get() { + return pd(this).event[key] + }, + set(value) { + pd(this).event[key] = value; + }, + configurable: true, + enumerable: true, + } +} + +/** + * Get the property descriptor to call a given method property. + * @param {string} key Property name to define property descriptor. + * @returns {PropertyDescriptor} The property descriptor to call the method property. + * @private + */ +function defineCallDescriptor(key) { + return { + value() { + const event = pd(this).event; + return event[key].apply(event, arguments) + }, + configurable: true, + enumerable: true, + } +} + +/** + * Define new wrapper class. + * @param {Function} BaseEvent The base wrapper class. + * @param {Object} proto The prototype of the original event. + * @returns {Function} The defined wrapper class. + * @private + */ +function defineWrapper(BaseEvent, proto) { + const keys = Object.keys(proto); + if (keys.length === 0) { + return BaseEvent + } + + /** CustomEvent */ + function CustomEvent(eventTarget, event) { + BaseEvent.call(this, eventTarget, event); + } + + CustomEvent.prototype = Object.create(BaseEvent.prototype, { + constructor: { value: CustomEvent, configurable: true, writable: true }, + }); + + // Define accessors. + for (let i = 0; i < keys.length; ++i) { + const key = keys[i]; + if (!(key in BaseEvent.prototype)) { + const descriptor = Object.getOwnPropertyDescriptor(proto, key); + const isFunc = typeof descriptor.value === "function"; + Object.defineProperty( + CustomEvent.prototype, + key, + isFunc + ? defineCallDescriptor(key) + : defineRedirectDescriptor(key) + ); + } + } + + return CustomEvent +} + +/** + * Get the wrapper class of a given prototype. + * @param {Object} proto The prototype of the original event to get its wrapper. + * @returns {Function} The wrapper class. + * @private + */ +function getWrapper(proto) { + if (proto == null || proto === Object.prototype) { + return Event + } + + let wrapper = wrappers.get(proto); + if (wrapper == null) { + wrapper = defineWrapper(getWrapper(Object.getPrototypeOf(proto)), proto); + wrappers.set(proto, wrapper); + } + return wrapper +} + +/** + * Wrap a given event to management a dispatching. + * @param {EventTarget} eventTarget The event target of this dispatching. + * @param {Object} event The event to wrap. + * @returns {Event} The wrapper instance. + * @private + */ +function wrapEvent(eventTarget, event) { + const Wrapper = getWrapper(Object.getPrototypeOf(event)); + return new Wrapper(eventTarget, event) +} + +/** + * Get the immediateStopped flag of a given event. + * @param {Event} event The event to get. + * @returns {boolean} The flag to stop propagation immediately. + * @private + */ +function isStopped(event) { + return pd(event).immediateStopped +} + +/** + * Set the current event phase of a given event. + * @param {Event} event The event to set current target. + * @param {number} eventPhase New event phase. + * @returns {void} + * @private + */ +function setEventPhase(event, eventPhase) { + pd(event).eventPhase = eventPhase; +} + +/** + * Set the current target of a given event. + * @param {Event} event The event to set current target. + * @param {EventTarget|null} currentTarget New current target. + * @returns {void} + * @private + */ +function setCurrentTarget(event, currentTarget) { + pd(event).currentTarget = currentTarget; +} + +/** + * Set a passive listener of a given event. + * @param {Event} event The event to set current target. + * @param {Function|null} passiveListener New passive listener. + * @returns {void} + * @private + */ +function setPassiveListener(event, passiveListener) { + pd(event).passiveListener = passiveListener; +} + +/** + * @typedef {object} ListenerNode + * @property {Function} listener + * @property {1|2|3} listenerType + * @property {boolean} passive + * @property {boolean} once + * @property {ListenerNode|null} next + * @private + */ + +/** + * @type {WeakMap<object, Map<string, ListenerNode>>} + * @private + */ +const listenersMap = new WeakMap(); + +// Listener types +const CAPTURE = 1; +const BUBBLE = 2; +const ATTRIBUTE = 3; + +/** + * Check whether a given value is an object or not. + * @param {any} x The value to check. + * @returns {boolean} `true` if the value is an object. + */ +function isObject(x) { + return x !== null && typeof x === "object" //eslint-disable-line no-restricted-syntax +} + +/** + * Get listeners. + * @param {EventTarget} eventTarget The event target to get. + * @returns {Map<string, ListenerNode>} The listeners. + * @private + */ +function getListeners(eventTarget) { + const listeners = listenersMap.get(eventTarget); + if (listeners == null) { + throw new TypeError( + "'this' is expected an EventTarget object, but got another value." + ) + } + return listeners +} + +/** + * Get the property descriptor for the event attribute of a given event. + * @param {string} eventName The event name to get property descriptor. + * @returns {PropertyDescriptor} The property descriptor. + * @private + */ +function defineEventAttributeDescriptor(eventName) { + return { + get() { + const listeners = getListeners(this); + let node = listeners.get(eventName); + while (node != null) { + if (node.listenerType === ATTRIBUTE) { + return node.listener + } + node = node.next; + } + return null + }, + + set(listener) { + if (typeof listener !== "function" && !isObject(listener)) { + listener = null; // eslint-disable-line no-param-reassign + } + const listeners = getListeners(this); + + // Traverse to the tail while removing old value. + let prev = null; + let node = listeners.get(eventName); + while (node != null) { + if (node.listenerType === ATTRIBUTE) { + // Remove old value. + if (prev !== null) { + prev.next = node.next; + } else if (node.next !== null) { + listeners.set(eventName, node.next); + } else { + listeners.delete(eventName); + } + } else { + prev = node; + } + + node = node.next; + } + + // Add new value. + if (listener !== null) { + const newNode = { + listener, + listenerType: ATTRIBUTE, + passive: false, + once: false, + next: null, + }; + if (prev === null) { + listeners.set(eventName, newNode); + } else { + prev.next = newNode; + } + } + }, + configurable: true, + enumerable: true, + } +} + +/** + * Define an event attribute (e.g. `eventTarget.onclick`). + * @param {Object} eventTargetPrototype The event target prototype to define an event attrbite. + * @param {string} eventName The event name to define. + * @returns {void} + */ +function defineEventAttribute(eventTargetPrototype, eventName) { + Object.defineProperty( + eventTargetPrototype, + `on${eventName}`, + defineEventAttributeDescriptor(eventName) + ); +} + +/** + * Define a custom EventTarget with event attributes. + * @param {string[]} eventNames Event names for event attributes. + * @returns {EventTarget} The custom EventTarget. + * @private + */ +function defineCustomEventTarget(eventNames) { + /** CustomEventTarget */ + function CustomEventTarget() { + EventTarget.call(this); + } + + CustomEventTarget.prototype = Object.create(EventTarget.prototype, { + constructor: { + value: CustomEventTarget, + configurable: true, + writable: true, + }, + }); + + for (let i = 0; i < eventNames.length; ++i) { + defineEventAttribute(CustomEventTarget.prototype, eventNames[i]); + } + + return CustomEventTarget +} + +/** + * EventTarget. + * + * - This is constructor if no arguments. + * - This is a function which returns a CustomEventTarget constructor if there are arguments. + * + * For example: + * + * class A extends EventTarget {} + * class B extends EventTarget("message") {} + * class C extends EventTarget("message", "error") {} + * class D extends EventTarget(["message", "error"]) {} + */ +function EventTarget() { + /*eslint-disable consistent-return */ + if (this instanceof EventTarget) { + listenersMap.set(this, new Map()); + return + } + if (arguments.length === 1 && Array.isArray(arguments[0])) { + return defineCustomEventTarget(arguments[0]) + } + if (arguments.length > 0) { + const types = new Array(arguments.length); + for (let i = 0; i < arguments.length; ++i) { + types[i] = arguments[i]; + } + return defineCustomEventTarget(types) + } + throw new TypeError("Cannot call a class as a function") + /*eslint-enable consistent-return */ +} + +// Should be enumerable, but class methods are not enumerable. +EventTarget.prototype = { + /** + * Add a given listener to this event target. + * @param {string} eventName The event name to add. + * @param {Function} listener The listener to add. + * @param {boolean|{capture?:boolean,passive?:boolean,once?:boolean}} [options] The options for this listener. + * @returns {void} + */ + addEventListener(eventName, listener, options) { + if (listener == null) { + return + } + if (typeof listener !== "function" && !isObject(listener)) { + throw new TypeError("'listener' should be a function or an object.") + } + + const listeners = getListeners(this); + const optionsIsObj = isObject(options); + const capture = optionsIsObj + ? Boolean(options.capture) + : Boolean(options); + const listenerType = capture ? CAPTURE : BUBBLE; + const newNode = { + listener, + listenerType, + passive: optionsIsObj && Boolean(options.passive), + once: optionsIsObj && Boolean(options.once), + next: null, + }; + + // Set it as the first node if the first node is null. + let node = listeners.get(eventName); + if (node === undefined) { + listeners.set(eventName, newNode); + return + } + + // Traverse to the tail while checking duplication.. + let prev = null; + while (node != null) { + if ( + node.listener === listener && + node.listenerType === listenerType + ) { + // Should ignore duplication. + return + } + prev = node; + node = node.next; + } + + // Add it. + prev.next = newNode; + }, + + /** + * Remove a given listener from this event target. + * @param {string} eventName The event name to remove. + * @param {Function} listener The listener to remove. + * @param {boolean|{capture?:boolean,passive?:boolean,once?:boolean}} [options] The options for this listener. + * @returns {void} + */ + removeEventListener(eventName, listener, options) { + if (listener == null) { + return + } + + const listeners = getListeners(this); + const capture = isObject(options) + ? Boolean(options.capture) + : Boolean(options); + const listenerType = capture ? CAPTURE : BUBBLE; + + let prev = null; + let node = listeners.get(eventName); + while (node != null) { + if ( + node.listener === listener && + node.listenerType === listenerType + ) { + if (prev !== null) { + prev.next = node.next; + } else if (node.next !== null) { + listeners.set(eventName, node.next); + } else { + listeners.delete(eventName); + } + return + } + + prev = node; + node = node.next; + } + }, + + /** + * Dispatch a given event. + * @param {Event|{type:string}} event The event to dispatch. + * @returns {boolean} `false` if canceled. + */ + dispatchEvent(event) { + if (event == null || typeof event.type !== "string") { + throw new TypeError('"event.type" should be a string.') + } + + // If listeners aren't registered, terminate. + const listeners = getListeners(this); + const eventName = event.type; + let node = listeners.get(eventName); + if (node == null) { + return true + } + + // Since we cannot rewrite several properties, so wrap object. + const wrappedEvent = wrapEvent(this, event); + + // This doesn't process capturing phase and bubbling phase. + // This isn't participating in a tree. + let prev = null; + while (node != null) { + // Remove this listener if it's once + if (node.once) { + if (prev !== null) { + prev.next = node.next; + } else if (node.next !== null) { + listeners.set(eventName, node.next); + } else { + listeners.delete(eventName); + } + } else { + prev = node; + } + + // Call this listener + setPassiveListener( + wrappedEvent, + node.passive ? node.listener : null + ); + if (typeof node.listener === "function") { + try { + node.listener.call(this, wrappedEvent); + } catch (err) { + if ( + typeof console !== "undefined" && + typeof console.error === "function" + ) { + console.error(err); + } + } + } else if ( + node.listenerType !== ATTRIBUTE && + typeof node.listener.handleEvent === "function" + ) { + node.listener.handleEvent(wrappedEvent); + } + + // Break if `event.stopImmediatePropagation` was called. + if (isStopped(wrappedEvent)) { + break + } + + node = node.next; + } + setPassiveListener(wrappedEvent, null); + setEventPhase(wrappedEvent, 0); + setCurrentTarget(wrappedEvent, null); + + return !wrappedEvent.defaultPrevented + }, +}; + +// `constructor` is not enumerable. +Object.defineProperty(EventTarget.prototype, "constructor", { + value: EventTarget, + configurable: true, + writable: true, +}); + +// Ensure `eventTarget instanceof window.EventTarget` is `true`. +if ( + typeof window !== "undefined" && + typeof window.EventTarget !== "undefined" +) { + Object.setPrototypeOf(EventTarget.prototype, window.EventTarget.prototype); +} + +export default EventTarget; +export { defineEventAttribute, EventTarget }; +//# sourceMappingURL=event-target-shim.mjs.map |