初始化代码

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The MIT License (MIT)
Copyright (c) 2014 Arnout Kazemier
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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# EventEmitter3
[![Version npm](https://img.shields.io/npm/v/eventemitter3.svg?style=flat-square)](https://www.npmjs.com/package/eventemitter3)[![Build Status](https://img.shields.io/travis/primus/eventemitter3/master.svg?style=flat-square)](https://travis-ci.org/primus/eventemitter3)[![Dependencies](https://img.shields.io/david/primus/eventemitter3.svg?style=flat-square)](https://david-dm.org/primus/eventemitter3)[![Coverage Status](https://img.shields.io/coveralls/primus/eventemitter3/master.svg?style=flat-square)](https://coveralls.io/r/primus/eventemitter3?branch=master)[![IRC channel](https://img.shields.io/badge/IRC-irc.freenode.net%23primus-00a8ff.svg?style=flat-square)](https://webchat.freenode.net/?channels=primus)
[![Sauce Test Status](https://saucelabs.com/browser-matrix/eventemitter3.svg)](https://saucelabs.com/u/eventemitter3)
EventEmitter3 is a high performance EventEmitter. It has been micro-optimized
for various of code paths making this, one of, if not the fastest EventEmitter
available for Node.js and browsers. The module is API compatible with the
EventEmitter that ships by default with Node.js but there are some slight
differences:
- Domain support has been removed.
- We do not `throw` an error when you emit an `error` event and nobody is
listening.
- The `newListener` and `removeListener` events have been removed as they
are useful only in some uncommon use-cases.
- The `setMaxListeners`, `getMaxListeners`, `prependListener` and
`prependOnceListener` methods are not available.
- Support for custom context for events so there is no need to use `fn.bind`.
- The `removeListener` method removes all matching listeners, not only the
first.
It's a drop in replacement for existing EventEmitters, but just faster. Free
performance, who wouldn't want that? The EventEmitter is written in EcmaScript 3
so it will work in the oldest browsers and node versions that you need to
support.
## Installation
```bash
$ npm install --save eventemitter3
```
## CDN
Recommended CDN:
```text
https://unpkg.com/eventemitter3@latest/umd/eventemitter3.min.js
```
## Usage
After installation the only thing you need to do is require the module:
```js
var EventEmitter = require('eventemitter3');
```
And you're ready to create your own EventEmitter instances. For the API
documentation, please follow the official Node.js documentation:
http://nodejs.org/api/events.html
### Contextual emits
We've upgraded the API of the `EventEmitter.on`, `EventEmitter.once` and
`EventEmitter.removeListener` to accept an extra argument which is the `context`
or `this` value that should be set for the emitted events. This means you no
longer have the overhead of an event that required `fn.bind` in order to get a
custom `this` value.
```js
var EE = new EventEmitter()
, context = { foo: 'bar' };
function emitted() {
console.log(this === context); // true
}
EE.once('event-name', emitted, context);
EE.on('another-event', emitted, context);
EE.removeListener('another-event', emitted, context);
```
### Tests and benchmarks
This module is well tested. You can run:
- `npm test` to run the tests under Node.js.
- `npm run test-browser` to run the tests in real browsers via Sauce Labs.
We also have a set of benchmarks to compare EventEmitter3 with some available
alternatives. To run the benchmarks run `npm run benchmark`.
Tests and benchmarks are not included in the npm package. If you want to play
with them you have to clone the GitHub repository.
## License
[MIT](LICENSE)

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type EventNames<T extends string | symbol | { [K in string | symbol]: any[] }> = T extends string | symbol ? T : keyof T;
type EventArgs<T extends string | symbol | { [K in string | symbol]: any[] }, K extends EventNames<T>> = T extends string | symbol ? any[] : K extends keyof T ? T[K] : never;
/**
* Minimal `EventEmitter` interface that is molded against the Node.js
* `EventEmitter` interface.
*/
declare class EventEmitter<EventTypes extends string | symbol | { [K in keyof EventTypes]: any[] } = string | symbol> {
static prefixed: string | boolean;
/**
* Return an array listing the events for which the emitter has registered
* listeners.
*/
eventNames(): Array<EventNames<EventTypes>>;
/**
* Return the listeners registered for a given event.
*/
listeners<T extends EventNames<EventTypes>>(event: T): Array<EventEmitter.ListenerFn<EventArgs<EventTypes, T>>>;
/**
* Return the number of listeners listening to a given event.
*/
listenerCount(event: EventNames<EventTypes>): number;
/**
* Calls each of the listeners registered for a given event.
*/
emit<T extends EventNames<EventTypes>>(event: T, ...args: EventArgs<EventTypes, T>): boolean;
/**
* Add a listener for a given event.
*/
on<T extends EventNames<EventTypes>>(event: T, fn: EventEmitter.ListenerFn<EventArgs<EventTypes, T>>, context?: any): this;
addListener<T extends EventNames<EventTypes>>(event: T, fn: EventEmitter.ListenerFn<EventArgs<EventTypes, T>>, context?: any): this;
/**
* Add a one-time listener for a given event.
*/
once<T extends EventNames<EventTypes>>(event: T, fn: EventEmitter.ListenerFn<EventArgs<EventTypes, T>>, context?: any): this;
/**
* Remove the listeners of a given event.
*/
removeListener<T extends EventNames<EventTypes>>(event: T, fn?: EventEmitter.ListenerFn<EventArgs<EventTypes, T>>, context?: any, once?: boolean): this;
off<T extends EventNames<EventTypes>>(event: T, fn?: EventEmitter.ListenerFn<EventArgs<EventTypes, T>>, context?: any, once?: boolean): this;
/**
* Remove all listeners, or those of the specified event.
*/
removeAllListeners(event?: EventNames<EventTypes>): this;
}
declare namespace EventEmitter {
export interface ListenerFn<Args extends any[] = any[]> {
(...args: Args): void;
}
export interface EventEmitterStatic {
new<EventTypes extends string | symbol | { [K in keyof EventTypes]: any[] } = string | symbol>(): EventEmitter<EventTypes>;
}
export const EventEmitter: EventEmitterStatic;
}
export = EventEmitter;

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'use strict';
var has = Object.prototype.hasOwnProperty,
prefix = '~';
/**
* Constructor to create a storage for our `EE` objects.
* An `Events` instance is a plain object whose properties are event names.
*
* @constructor
* @private
*/
function Events() {} //
// We try to not inherit from `Object.prototype`. In some engines creating an
// instance in this way is faster than calling `Object.create(null)` directly.
// If `Object.create(null)` is not supported we prefix the event names with a
// character to make sure that the built-in object properties are not
// overridden or used as an attack vector.
//
if (Object.create) {
Events.prototype = Object.create(null); //
// This hack is needed because the `__proto__` property is still inherited in
// some old browsers like Android 4, iPhone 5.1, Opera 11 and Safari 5.
//
if (!new Events().__proto__) prefix = false;
}
/**
* Representation of a single event listener.
*
* @param {Function} fn The listener function.
* @param {*} context The context to invoke the listener with.
* @param {Boolean} [once=false] Specify if the listener is a one-time listener.
* @constructor
* @private
*/
function EE(fn, context, once) {
this.fn = fn;
this.context = context;
this.once = once || false;
}
/**
* Add a listener for a given event.
*
* @param {EventEmitter} emitter Reference to the `EventEmitter` instance.
* @param {(String|Symbol)} event The event name.
* @param {Function} fn The listener function.
* @param {*} context The context to invoke the listener with.
* @param {Boolean} once Specify if the listener is a one-time listener.
* @returns {EventEmitter}
* @private
*/
function addListener(emitter, event, fn, context, once) {
if (typeof fn !== 'function') {
throw new TypeError('The listener must be a function');
}
var listener = new EE(fn, context || emitter, once),
evt = prefix ? prefix + event : event;
if (!emitter._events[evt]) emitter._events[evt] = listener, emitter._eventsCount++;else if (!emitter._events[evt].fn) emitter._events[evt].push(listener);else emitter._events[evt] = [emitter._events[evt], listener];
return emitter;
}
/**
* Clear event by name.
*
* @param {EventEmitter} emitter Reference to the `EventEmitter` instance.
* @param {(String|Symbol)} evt The Event name.
* @private
*/
function clearEvent(emitter, evt) {
if (--emitter._eventsCount === 0) emitter._events = new Events();else delete emitter._events[evt];
}
/**
* Minimal `EventEmitter` interface that is molded against the Node.js
* `EventEmitter` interface.
*
* @constructor
* @public
*/
function EventEmitter() {
this._events = new Events();
this._eventsCount = 0;
}
/**
* Return an array listing the events for which the emitter has registered
* listeners.
*
* @returns {Array}
* @public
*/
EventEmitter.prototype.eventNames = function eventNames() {
var names = [],
events,
name;
if (this._eventsCount === 0) return names;
for (name in events = this._events) {
if (has.call(events, name)) names.push(prefix ? name.slice(1) : name);
}
if (Object.getOwnPropertySymbols) {
return names.concat(Object.getOwnPropertySymbols(events));
}
return names;
};
/**
* Return the listeners registered for a given event.
*
* @param {(String|Symbol)} event The event name.
* @returns {Array} The registered listeners.
* @public
*/
EventEmitter.prototype.listeners = function listeners(event) {
var evt = prefix ? prefix + event : event,
handlers = this._events[evt];
if (!handlers) return [];
if (handlers.fn) return [handlers.fn];
for (var i = 0, l = handlers.length, ee = new Array(l); i < l; i++) {
ee[i] = handlers[i].fn;
}
return ee;
};
/**
* Return the number of listeners listening to a given event.
*
* @param {(String|Symbol)} event The event name.
* @returns {Number} The number of listeners.
* @public
*/
EventEmitter.prototype.listenerCount = function listenerCount(event) {
var evt = prefix ? prefix + event : event,
listeners = this._events[evt];
if (!listeners) return 0;
if (listeners.fn) return 1;
return listeners.length;
};
/**
* Calls each of the listeners registered for a given event.
*
* @param {(String|Symbol)} event The event name.
* @returns {Boolean} `true` if the event had listeners, else `false`.
* @public
*/
EventEmitter.prototype.emit = function emit(event, a1, a2, a3, a4, a5) {
var evt = prefix ? prefix + event : event;
if (!this._events[evt]) return false;
var listeners = this._events[evt],
len = arguments.length,
args,
i;
if (listeners.fn) {
if (listeners.once) this.removeListener(event, listeners.fn, undefined, true);
switch (len) {
case 1:
return listeners.fn.call(listeners.context), true;
case 2:
return listeners.fn.call(listeners.context, a1), true;
case 3:
return listeners.fn.call(listeners.context, a1, a2), true;
case 4:
return listeners.fn.call(listeners.context, a1, a2, a3), true;
case 5:
return listeners.fn.call(listeners.context, a1, a2, a3, a4), true;
case 6:
return listeners.fn.call(listeners.context, a1, a2, a3, a4, a5), true;
}
for (i = 1, args = new Array(len - 1); i < len; i++) {
args[i - 1] = arguments[i];
}
listeners.fn.apply(listeners.context, args);
} else {
var length = listeners.length,
j;
for (i = 0; i < length; i++) {
if (listeners[i].once) this.removeListener(event, listeners[i].fn, undefined, true);
switch (len) {
case 1:
listeners[i].fn.call(listeners[i].context);
break;
case 2:
listeners[i].fn.call(listeners[i].context, a1);
break;
case 3:
listeners[i].fn.call(listeners[i].context, a1, a2);
break;
case 4:
listeners[i].fn.call(listeners[i].context, a1, a2, a3);
break;
default:
if (!args) for (j = 1, args = new Array(len - 1); j < len; j++) {
args[j - 1] = arguments[j];
}
listeners[i].fn.apply(listeners[i].context, args);
}
}
}
return true;
};
/**
* Add a listener for a given event.
*
* @param {(String|Symbol)} event The event name.
* @param {Function} fn The listener function.
* @param {*} [context=this] The context to invoke the listener with.
* @returns {EventEmitter} `this`.
* @public
*/
EventEmitter.prototype.on = function on(event, fn, context) {
return addListener(this, event, fn, context, false);
};
/**
* Add a one-time listener for a given event.
*
* @param {(String|Symbol)} event The event name.
* @param {Function} fn The listener function.
* @param {*} [context=this] The context to invoke the listener with.
* @returns {EventEmitter} `this`.
* @public
*/
EventEmitter.prototype.once = function once(event, fn, context) {
return addListener(this, event, fn, context, true);
};
/**
* Remove the listeners of a given event.
*
* @param {(String|Symbol)} event The event name.
* @param {Function} fn Only remove the listeners that match this function.
* @param {*} context Only remove the listeners that have this context.
* @param {Boolean} once Only remove one-time listeners.
* @returns {EventEmitter} `this`.
* @public
*/
EventEmitter.prototype.removeListener = function removeListener(event, fn, context, once) {
var evt = prefix ? prefix + event : event;
if (!this._events[evt]) return this;
if (!fn) {
clearEvent(this, evt);
return this;
}
var listeners = this._events[evt];
if (listeners.fn) {
if (listeners.fn === fn && (!once || listeners.once) && (!context || listeners.context === context)) {
clearEvent(this, evt);
}
} else {
for (var i = 0, events = [], length = listeners.length; i < length; i++) {
if (listeners[i].fn !== fn || once && !listeners[i].once || context && listeners[i].context !== context) {
events.push(listeners[i]);
}
} //
// Reset the array, or remove it completely if we have no more listeners.
//
if (events.length) this._events[evt] = events.length === 1 ? events[0] : events;else clearEvent(this, evt);
}
return this;
};
/**
* Remove all listeners, or those of the specified event.
*
* @param {(String|Symbol)} [event] The event name.
* @returns {EventEmitter} `this`.
* @public
*/
EventEmitter.prototype.removeAllListeners = function removeAllListeners(event) {
var evt;
if (event) {
evt = prefix ? prefix + event : event;
if (this._events[evt]) clearEvent(this, evt);
} else {
this._events = new Events();
this._eventsCount = 0;
}
return this;
}; //
// Alias methods names because people roll like that.
//
EventEmitter.prototype.off = EventEmitter.prototype.removeListener;
EventEmitter.prototype.addListener = EventEmitter.prototype.on; //
// Expose the prefix.
//
EventEmitter.prefixed = prefix; //
// Allow `EventEmitter` to be imported as module namespace.
//
EventEmitter.EventEmitter = EventEmitter; //
// Expose the module.
//
if ('undefined' !== typeof module) {
module.exports = EventEmitter;
}

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{
"_from": "eventemitter3@^4.0.0",
"_id": "eventemitter3@4.0.0",
"_inBundle": false,
"_integrity": "sha512-qerSRB0p+UDEssxTtm6EDKcE7W4OaoisfIMl4CngyEhjpYglocpNg6UEqCvemdGhosAsg4sO2dXJOdyBifPGCg==",
"_location": "/eventemitter3",
"_phantomChildren": {},
"_requested": {
"type": "range",
"registry": true,
"raw": "eventemitter3@^4.0.0",
"name": "eventemitter3",
"escapedName": "eventemitter3",
"rawSpec": "^4.0.0",
"saveSpec": null,
"fetchSpec": "^4.0.0"
},
"_requiredBy": [
"/widget-ui"
],
"_resolved": "https://registry.npmjs.org/eventemitter3/-/eventemitter3-4.0.0.tgz",
"_shasum": "d65176163887ee59f386d64c82610b696a4a74eb",
"_spec": "eventemitter3@^4.0.0",
"_where": "C:\\Users\\sanfordsun\\WeChatProjects\\minicode-177\\node_modules\\widget-ui",
"author": {
"name": "Arnout Kazemier"
},
"bugs": {
"url": "https://github.com/primus/eventemitter3/issues"
},
"bundleDependencies": false,
"deprecated": false,
"description": "EventEmitter3 focuses on performance while maintaining a Node.js AND browser compatible interface.",
"devDependencies": {
"assume": "~2.2.0",
"browserify": "~16.2.0",
"mocha": "~6.1.0",
"nyc": "~14.1.0",
"pre-commit": "~1.2.0",
"sauce-browsers": "~2.0.0",
"sauce-test": "~1.3.3",
"uglify-js": "~3.6.0"
},
"files": [
"index.js",
"index.d.ts",
"umd"
],
"homepage": "https://github.com/primus/eventemitter3#readme",
"keywords": [
"EventEmitter",
"EventEmitter2",
"EventEmitter3",
"Events",
"addEventListener",
"addListener",
"emit",
"emits",
"emitter",
"event",
"once",
"pub/sub",
"publish",
"reactor",
"subscribe"
],
"license": "MIT",
"main": "index.js",
"name": "eventemitter3",
"repository": {
"type": "git",
"url": "git://github.com/primus/eventemitter3.git"
},
"scripts": {
"benchmark": "find benchmarks/run -name '*.js' -exec benchmarks/start.sh {} \\;",
"browserify": "rm -rf umd && mkdir umd && browserify index.js -s EventEmitter3 -o umd/eventemitter3.js",
"minify": "uglifyjs umd/eventemitter3.js --source-map -cm -o umd/eventemitter3.min.js",
"prepublishOnly": "npm run browserify && npm run minify",
"test": "nyc --reporter=html --reporter=text mocha test/test.js",
"test-browser": "node test/browser.js"
},
"typings": "index.d.ts",
"version": "4.0.0"
}

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(function (f) {
if (typeof exports === "object" && typeof module !== "undefined") {
module.exports = f();
} else if (typeof define === "function" && define.amd) {
define([], f);
} else {
var g;
if (typeof window !== "undefined") {
g = window;
} else if (typeof global !== "undefined") {
g = global;
} else if (typeof self !== "undefined") {
g = self;
} else {
g = this;
}
g.EventEmitter3 = f();
}
})(function () {
var define, module, exports;
return function () {
function r(e, n, t) {
function o(i, f) {
if (!n[i]) {
if (!e[i]) {
var c = "function" == typeof require && require;
if (!f && c) return c(i, !0);
if (u) return u(i, !0);
var a = new Error("Cannot find module '" + i + "'");
throw a.code = "MODULE_NOT_FOUND", a;
}
var p = n[i] = {
exports: {}
};
e[i][0].call(p.exports, function (r) {
var n = e[i][1][r];
return o(n || r);
}, p, p.exports, r, e, n, t);
}
return n[i].exports;
}
for (var u = "function" == typeof require && require, i = 0; i < t.length; i++) o(t[i]);
return o;
}
return r;
}()({
1: [function (require, module, exports) {
'use strict';
var has = Object.prototype.hasOwnProperty,
prefix = '~';
/**
* Constructor to create a storage for our `EE` objects.
* An `Events` instance is a plain object whose properties are event names.
*
* @constructor
* @private
*/
function Events() {} //
// We try to not inherit from `Object.prototype`. In some engines creating an
// instance in this way is faster than calling `Object.create(null)` directly.
// If `Object.create(null)` is not supported we prefix the event names with a
// character to make sure that the built-in object properties are not
// overridden or used as an attack vector.
//
if (Object.create) {
Events.prototype = Object.create(null); //
// This hack is needed because the `__proto__` property is still inherited in
// some old browsers like Android 4, iPhone 5.1, Opera 11 and Safari 5.
//
if (!new Events().__proto__) prefix = false;
}
/**
* Representation of a single event listener.
*
* @param {Function} fn The listener function.
* @param {*} context The context to invoke the listener with.
* @param {Boolean} [once=false] Specify if the listener is a one-time listener.
* @constructor
* @private
*/
function EE(fn, context, once) {
this.fn = fn;
this.context = context;
this.once = once || false;
}
/**
* Add a listener for a given event.
*
* @param {EventEmitter} emitter Reference to the `EventEmitter` instance.
* @param {(String|Symbol)} event The event name.
* @param {Function} fn The listener function.
* @param {*} context The context to invoke the listener with.
* @param {Boolean} once Specify if the listener is a one-time listener.
* @returns {EventEmitter}
* @private
*/
function addListener(emitter, event, fn, context, once) {
if (typeof fn !== 'function') {
throw new TypeError('The listener must be a function');
}
var listener = new EE(fn, context || emitter, once),
evt = prefix ? prefix + event : event;
if (!emitter._events[evt]) emitter._events[evt] = listener, emitter._eventsCount++;else if (!emitter._events[evt].fn) emitter._events[evt].push(listener);else emitter._events[evt] = [emitter._events[evt], listener];
return emitter;
}
/**
* Clear event by name.
*
* @param {EventEmitter} emitter Reference to the `EventEmitter` instance.
* @param {(String|Symbol)} evt The Event name.
* @private
*/
function clearEvent(emitter, evt) {
if (--emitter._eventsCount === 0) emitter._events = new Events();else delete emitter._events[evt];
}
/**
* Minimal `EventEmitter` interface that is molded against the Node.js
* `EventEmitter` interface.
*
* @constructor
* @public
*/
function EventEmitter() {
this._events = new Events();
this._eventsCount = 0;
}
/**
* Return an array listing the events for which the emitter has registered
* listeners.
*
* @returns {Array}
* @public
*/
EventEmitter.prototype.eventNames = function eventNames() {
var names = [],
events,
name;
if (this._eventsCount === 0) return names;
for (name in events = this._events) {
if (has.call(events, name)) names.push(prefix ? name.slice(1) : name);
}
if (Object.getOwnPropertySymbols) {
return names.concat(Object.getOwnPropertySymbols(events));
}
return names;
};
/**
* Return the listeners registered for a given event.
*
* @param {(String|Symbol)} event The event name.
* @returns {Array} The registered listeners.
* @public
*/
EventEmitter.prototype.listeners = function listeners(event) {
var evt = prefix ? prefix + event : event,
handlers = this._events[evt];
if (!handlers) return [];
if (handlers.fn) return [handlers.fn];
for (var i = 0, l = handlers.length, ee = new Array(l); i < l; i++) {
ee[i] = handlers[i].fn;
}
return ee;
};
/**
* Return the number of listeners listening to a given event.
*
* @param {(String|Symbol)} event The event name.
* @returns {Number} The number of listeners.
* @public
*/
EventEmitter.prototype.listenerCount = function listenerCount(event) {
var evt = prefix ? prefix + event : event,
listeners = this._events[evt];
if (!listeners) return 0;
if (listeners.fn) return 1;
return listeners.length;
};
/**
* Calls each of the listeners registered for a given event.
*
* @param {(String|Symbol)} event The event name.
* @returns {Boolean} `true` if the event had listeners, else `false`.
* @public
*/
EventEmitter.prototype.emit = function emit(event, a1, a2, a3, a4, a5) {
var evt = prefix ? prefix + event : event;
if (!this._events[evt]) return false;
var listeners = this._events[evt],
len = arguments.length,
args,
i;
if (listeners.fn) {
if (listeners.once) this.removeListener(event, listeners.fn, undefined, true);
switch (len) {
case 1:
return listeners.fn.call(listeners.context), true;
case 2:
return listeners.fn.call(listeners.context, a1), true;
case 3:
return listeners.fn.call(listeners.context, a1, a2), true;
case 4:
return listeners.fn.call(listeners.context, a1, a2, a3), true;
case 5:
return listeners.fn.call(listeners.context, a1, a2, a3, a4), true;
case 6:
return listeners.fn.call(listeners.context, a1, a2, a3, a4, a5), true;
}
for (i = 1, args = new Array(len - 1); i < len; i++) {
args[i - 1] = arguments[i];
}
listeners.fn.apply(listeners.context, args);
} else {
var length = listeners.length,
j;
for (i = 0; i < length; i++) {
if (listeners[i].once) this.removeListener(event, listeners[i].fn, undefined, true);
switch (len) {
case 1:
listeners[i].fn.call(listeners[i].context);
break;
case 2:
listeners[i].fn.call(listeners[i].context, a1);
break;
case 3:
listeners[i].fn.call(listeners[i].context, a1, a2);
break;
case 4:
listeners[i].fn.call(listeners[i].context, a1, a2, a3);
break;
default:
if (!args) for (j = 1, args = new Array(len - 1); j < len; j++) {
args[j - 1] = arguments[j];
}
listeners[i].fn.apply(listeners[i].context, args);
}
}
}
return true;
};
/**
* Add a listener for a given event.
*
* @param {(String|Symbol)} event The event name.
* @param {Function} fn The listener function.
* @param {*} [context=this] The context to invoke the listener with.
* @returns {EventEmitter} `this`.
* @public
*/
EventEmitter.prototype.on = function on(event, fn, context) {
return addListener(this, event, fn, context, false);
};
/**
* Add a one-time listener for a given event.
*
* @param {(String|Symbol)} event The event name.
* @param {Function} fn The listener function.
* @param {*} [context=this] The context to invoke the listener with.
* @returns {EventEmitter} `this`.
* @public
*/
EventEmitter.prototype.once = function once(event, fn, context) {
return addListener(this, event, fn, context, true);
};
/**
* Remove the listeners of a given event.
*
* @param {(String|Symbol)} event The event name.
* @param {Function} fn Only remove the listeners that match this function.
* @param {*} context Only remove the listeners that have this context.
* @param {Boolean} once Only remove one-time listeners.
* @returns {EventEmitter} `this`.
* @public
*/
EventEmitter.prototype.removeListener = function removeListener(event, fn, context, once) {
var evt = prefix ? prefix + event : event;
if (!this._events[evt]) return this;
if (!fn) {
clearEvent(this, evt);
return this;
}
var listeners = this._events[evt];
if (listeners.fn) {
if (listeners.fn === fn && (!once || listeners.once) && (!context || listeners.context === context)) {
clearEvent(this, evt);
}
} else {
for (var i = 0, events = [], length = listeners.length; i < length; i++) {
if (listeners[i].fn !== fn || once && !listeners[i].once || context && listeners[i].context !== context) {
events.push(listeners[i]);
}
} //
// Reset the array, or remove it completely if we have no more listeners.
//
if (events.length) this._events[evt] = events.length === 1 ? events[0] : events;else clearEvent(this, evt);
}
return this;
};
/**
* Remove all listeners, or those of the specified event.
*
* @param {(String|Symbol)} [event] The event name.
* @returns {EventEmitter} `this`.
* @public
*/
EventEmitter.prototype.removeAllListeners = function removeAllListeners(event) {
var evt;
if (event) {
evt = prefix ? prefix + event : event;
if (this._events[evt]) clearEvent(this, evt);
} else {
this._events = new Events();
this._eventsCount = 0;
}
return this;
}; //
// Alias methods names because people roll like that.
//
EventEmitter.prototype.off = EventEmitter.prototype.removeListener;
EventEmitter.prototype.addListener = EventEmitter.prototype.on; //
// Expose the prefix.
//
EventEmitter.prefixed = prefix; //
// Allow `EventEmitter` to be imported as module namespace.
//
EventEmitter.EventEmitter = EventEmitter; //
// Expose the module.
//
if ('undefined' !== typeof module) {
module.exports = EventEmitter;
}
}, {}]
}, {}, [1])(1);
});

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!function (e) {
if ("object" == typeof exports && "undefined" != typeof module) module.exports = e();else if ("function" == typeof define && define.amd) define([], e);else {
("undefined" != typeof window ? window : "undefined" != typeof global ? global : "undefined" != typeof self ? self : this).EventEmitter3 = e();
}
}(function () {
return function i(s, f, c) {
function u(t, e) {
if (!f[t]) {
if (!s[t]) {
var n = "function" == typeof require && require;
if (!e && n) return n(t, !0);
if (a) return a(t, !0);
var r = new Error("Cannot find module '" + t + "'");
throw r.code = "MODULE_NOT_FOUND", r;
}
var o = f[t] = {
exports: {}
};
s[t][0].call(o.exports, function (e) {
return u(s[t][1][e] || e);
}, o, o.exports, i, s, f, c);
}
return f[t].exports;
}
for (var a = "function" == typeof require && require, e = 0; e < c.length; e++) u(c[e]);
return u;
}({
1: [function (e, t, n) {
"use strict";
var r = Object.prototype.hasOwnProperty,
v = "~";
function o() {}
function f(e, t, n) {
this.fn = e, this.context = t, this.once = n || !1;
}
function i(e, t, n, r, o) {
if ("function" != typeof n) throw new TypeError("The listener must be a function");
var i = new f(n, r || e, o),
s = v ? v + t : t;
return e._events[s] ? e._events[s].fn ? e._events[s] = [e._events[s], i] : e._events[s].push(i) : (e._events[s] = i, e._eventsCount++), e;
}
function u(e, t) {
0 == --e._eventsCount ? e._events = new o() : delete e._events[t];
}
function s() {
this._events = new o(), this._eventsCount = 0;
}
Object.create && (o.prototype = Object.create(null), new o().__proto__ || (v = !1)), s.prototype.eventNames = function () {
var e,
t,
n = [];
if (0 === this._eventsCount) return n;
for (t in e = this._events) r.call(e, t) && n.push(v ? t.slice(1) : t);
return Object.getOwnPropertySymbols ? n.concat(Object.getOwnPropertySymbols(e)) : n;
}, s.prototype.listeners = function (e) {
var t = v ? v + e : e,
n = this._events[t];
if (!n) return [];
if (n.fn) return [n.fn];
for (var r = 0, o = n.length, i = new Array(o); r < o; r++) i[r] = n[r].fn;
return i;
}, s.prototype.listenerCount = function (e) {
var t = v ? v + e : e,
n = this._events[t];
return n ? n.fn ? 1 : n.length : 0;
}, s.prototype.emit = function (e, t, n, r, o, i) {
var s = v ? v + e : e;
if (!this._events[s]) return !1;
var f,
c,
u = this._events[s],
a = arguments.length;
if (u.fn) {
switch (u.once && this.removeListener(e, u.fn, void 0, !0), a) {
case 1:
return u.fn.call(u.context), !0;
case 2:
return u.fn.call(u.context, t), !0;
case 3:
return u.fn.call(u.context, t, n), !0;
case 4:
return u.fn.call(u.context, t, n, r), !0;
case 5:
return u.fn.call(u.context, t, n, r, o), !0;
case 6:
return u.fn.call(u.context, t, n, r, o, i), !0;
}
for (c = 1, f = new Array(a - 1); c < a; c++) f[c - 1] = arguments[c];
u.fn.apply(u.context, f);
} else {
var l,
p = u.length;
for (c = 0; c < p; c++) switch (u[c].once && this.removeListener(e, u[c].fn, void 0, !0), a) {
case 1:
u[c].fn.call(u[c].context);
break;
case 2:
u[c].fn.call(u[c].context, t);
break;
case 3:
u[c].fn.call(u[c].context, t, n);
break;
case 4:
u[c].fn.call(u[c].context, t, n, r);
break;
default:
if (!f) for (l = 1, f = new Array(a - 1); l < a; l++) f[l - 1] = arguments[l];
u[c].fn.apply(u[c].context, f);
}
}
return !0;
}, s.prototype.on = function (e, t, n) {
return i(this, e, t, n, !1);
}, s.prototype.once = function (e, t, n) {
return i(this, e, t, n, !0);
}, s.prototype.removeListener = function (e, t, n, r) {
var o = v ? v + e : e;
if (!this._events[o]) return this;
if (!t) return u(this, o), this;
var i = this._events[o];
if (i.fn) i.fn !== t || r && !i.once || n && i.context !== n || u(this, o);else {
for (var s = 0, f = [], c = i.length; s < c; s++) (i[s].fn !== t || r && !i[s].once || n && i[s].context !== n) && f.push(i[s]);
f.length ? this._events[o] = 1 === f.length ? f[0] : f : u(this, o);
}
return this;
}, s.prototype.removeAllListeners = function (e) {
var t;
return e ? (t = v ? v + e : e, this._events[t] && u(this, t)) : (this._events = new o(), this._eventsCount = 0), this;
}, s.prototype.off = s.prototype.removeListener, s.prototype.addListener = s.prototype.on, s.prefixed = v, s.EventEmitter = s, void 0 !== t && (t.exports = s);
}, {}]
}, {}, [1])(1);
});

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import computeLayout from "./css-layout";
import { getDefaultStyle, scalableStyles, layoutAffectedStyles } from "./style";
type LayoutData = {
left: number,
top: number,
width: number,
height: number
};
type LayoutNode = {
id: number,
style: Object,
children: LayoutNode[],
layout?: LayoutData
};
let uuid = 0;
class Element {
public static uuid(): number {
return uuid++;
}
public parent: Element | null = null;
public id: number = Element.uuid();
public style: { [key: string]: any } = {};
public computedStyle: { [key: string]: any } = {};
public lastComputedStyle: { [key: string]: any } = {};
public children: { [key: string]: Element } = {};
public layoutBox: LayoutData = { left: 0, top: 0, width: 0, height: 0 };
constructor(style: { [key: string]: any } = {}) {
// 拷贝一份,防止被外部逻辑修改
style = Object.assign(getDefaultStyle(), style);
this.computedStyle = Object.assign(getDefaultStyle(), style);
this.lastComputedStyle = Object.assign(getDefaultStyle(), style);
Object.keys(style).forEach(key => {
Object.defineProperty(this.style, key, {
configurable: true,
enumerable: true,
get: () => style[key],
set: (value: any) => {
if (value === style[key] || value === undefined) {
return;
}
this.lastComputedStyle = this.computedStyle[key]
style[key] = value
this.computedStyle[key] = value
// 如果设置的是一个可缩放的属性, 计算自己
if (scalableStyles.includes(key) && this.style.scale) {
this.computedStyle[key] = value * this.style.scale
}
// 如果设置的是 scale, 则把所有可缩放的属性计算
if (key === "scale") {
scalableStyles.forEach(prop => {
if (style[prop]) {
this.computedStyle[prop] = style[prop] * value
}
})
}
if (key === "hidden") {
if (value) {
layoutAffectedStyles.forEach((key: string) => {
this.computedStyle[key] = 0;
});
} else {
layoutAffectedStyles.forEach((key: string) => {
this.computedStyle[key] = this.lastComputedStyle[key];
});
}
}
}
})
})
if (this.style.scale) {
scalableStyles.forEach((key: string) => {
if (this.style[key]) {
const computedValue = this.style[key] * this.style.scale;
this.computedStyle[key] = computedValue;
}
});
}
if (style.hidden) {
layoutAffectedStyles.forEach((key: string) => {
this.computedStyle[key] = 0;
});
}
}
getAbsolutePosition(element: Element) {
if (!element) {
return this.getAbsolutePosition(this)
}
if (!element.parent) {
return {
left: 0,
top: 0
}
}
const {left, top} = this.getAbsolutePosition(element.parent)
return {
left: left + element.layoutBox.left,
top: top + element.layoutBox.top
}
}
public add(element: Element) {
element.parent = this;
this.children[element.id] = element;
}
public remove(element?: Element) {
// 删除自己
if (!element) {
Object.keys(this.children).forEach(id => {
const child = this.children[id]
child.remove()
delete this.children[id]
})
} else if (this.children[element.id]) {
// 是自己的子节点才删除
element.remove()
delete this.children[element.id];
}
}
public getNodeTree(): LayoutNode {
return {
id: this.id,
style: this.computedStyle,
children: Object.keys(this.children).map((id: string) => {
const child = this.children[id];
return child.getNodeTree();
})
}
}
public applyLayout(layoutNode: LayoutNode) {
["left", "top", "width", "height"].forEach((key: string) => {
if (layoutNode.layout && typeof layoutNode.layout[key] === "number") {
this.layoutBox[key] = layoutNode.layout[key];
if (this.parent && (key === "left" || key === "top")) {
this.layoutBox[key] += this.parent.layoutBox[key];
}
}
});
layoutNode.children.forEach((child: LayoutNode) => {
this.children[child.id].applyLayout(child);
});
}
layout() {
const nodeTree = this.getNodeTree();
computeLayout(nodeTree);
this.applyLayout(nodeTree);
}
}
export default Element;

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@@ -0,0 +1,15 @@
import _EventEmitter from "eventemitter3";
const emitter = new _EventEmitter();
export default class EventEmitter {
public emit(event: string, data?: any) {
emitter.emit(event, data);
}
public on(event: string, callback) {
emitter.on(event, callback);
}
public off(event: string, callback) {
emitter.off(event, callback);
}
}

View File

@@ -0,0 +1,746 @@
module.exports = function () {
var __MODS__ = {};
var __DEFINE__ = function (modId, func, req) {
var m = {
exports: {}
};
__MODS__[modId] = {
status: 0,
func: func,
req: req,
m: m
};
};
var __REQUIRE__ = function (modId, source) {
if (!__MODS__[modId]) return require(source);
if (!__MODS__[modId].status) {
var m = {
exports: {}
};
__MODS__[modId].status = 1;
__MODS__[modId].func(__MODS__[modId].req, m, m.exports);
if (typeof m.exports === "object") {
__MODS__[modId].m.exports.__proto__ = m.exports.__proto__;
Object.keys(m.exports).forEach(function (k) {
__MODS__[modId].m.exports[k] = m.exports[k];
var desp = Object.getOwnPropertyDescriptor(m.exports, k);
if (desp && desp.configurable) Object.defineProperty(m.exports, k, {
set: function (val) {
__MODS__[modId].m.exports[k] = val;
},
get: function () {
return __MODS__[modId].m.exports[k];
}
});
});
if (m.exports.__esModule) Object.defineProperty(__MODS__[modId].m.exports, "__esModule", {
value: true
});
} else {
__MODS__[modId].m.exports = m.exports;
}
}
return __MODS__[modId].m.exports;
};
var __REQUIRE_WILDCARD__ = function (obj) {
if (obj && obj.__esModule) {
return obj;
} else {
var newObj = {};
if (obj != null) {
for (var k in obj) {
if (Object.prototype.hasOwnProperty.call(obj, k)) newObj[k] = obj[k];
}
}
newObj.default = obj;
return newObj;
}
};
var __REQUIRE_DEFAULT__ = function (obj) {
return obj && obj.__esModule ? obj.default : obj;
};
__DEFINE__(1572960819414, function (require, module, exports) {
!function (t, e) {
if ("object" == typeof exports && "object" == typeof module) module.exports = e();else if ("function" == typeof define && define.amd) define([], e);else {
var o = e();
for (var r in o) ("object" == typeof exports ? exports : t)[r] = o[r];
}
}(this, function () {
return function (t) {
var e = {};
function o(r) {
if (e[r]) return e[r].exports;
var i = e[r] = {
i: r,
l: !1,
exports: {}
};
return t[r].call(i.exports, i, i.exports, o), i.l = !0, i.exports;
}
return o.m = t, o.c = e, o.d = function (t, e, r) {
o.o(t, e) || Object.defineProperty(t, e, {
enumerable: !0,
get: r
});
}, o.r = function (t) {
"undefined" != typeof Symbol && Symbol.toStringTag && Object.defineProperty(t, Symbol.toStringTag, {
value: "Module"
}), Object.defineProperty(t, "__esModule", {
value: !0
});
}, o.t = function (t, e) {
if (1 & e && (t = o(t)), 8 & e) return t;
if (4 & e && "object" == typeof t && t && t.__esModule) return t;
var r = Object.create(null);
if (o.r(r), Object.defineProperty(r, "default", {
enumerable: !0,
value: t
}), 2 & e && "string" != typeof t) for (var i in t) o.d(r, i, function (e) {
return t[e];
}.bind(null, i));
return r;
}, o.n = function (t) {
var e = t && t.__esModule ? function () {
return t.default;
} : function () {
return t;
};
return o.d(e, "a", e), e;
}, o.o = function (t, e) {
return Object.prototype.hasOwnProperty.call(t, e);
}, o.p = "", o(o.s = 0);
}([function (t, e, o) {
var r = this && this.__importDefault || function (t) {
return t && t.__esModule ? t : {
default: t
};
};
Object.defineProperty(e, "__esModule", {
value: !0
});
var i = r(o(1)),
l = o(2),
n = 0,
a = function () {
function t(e) {
var o = this;
void 0 === e && (e = {}), this.parent = null, this.id = t.uuid(), this.style = {}, this.computedStyle = {}, this.lastComputedStyle = {}, this.children = {}, this.layoutBox = {
left: 0,
top: 0,
width: 0,
height: 0
}, e = Object.assign(l.getDefaultStyle(), e), this.computedStyle = Object.assign(l.getDefaultStyle(), e), this.lastComputedStyle = Object.assign(l.getDefaultStyle(), e), Object.keys(e).forEach(function (t) {
Object.defineProperty(o.style, t, {
configurable: !0,
enumerable: !0,
get: function () {
return e[t];
},
set: function (r) {
r !== e[t] && void 0 !== r && (o.lastComputedStyle = o.computedStyle[t], e[t] = r, o.computedStyle[t] = r, l.scalableStyles.includes(t) && o.style.scale && (o.computedStyle[t] = r * o.style.scale), "scale" === t && l.scalableStyles.forEach(function (t) {
e[t] && (o.computedStyle[t] = e[t] * r);
}), "hidden" === t && (r ? l.layoutAffectedStyles.forEach(function (t) {
o.computedStyle[t] = 0;
}) : l.layoutAffectedStyles.forEach(function (t) {
o.computedStyle[t] = o.lastComputedStyle[t];
})));
}
});
}), this.style.scale && l.scalableStyles.forEach(function (t) {
if (o.style[t]) {
var e = o.style[t] * o.style.scale;
o.computedStyle[t] = e;
}
}), e.hidden && l.layoutAffectedStyles.forEach(function (t) {
o.computedStyle[t] = 0;
});
}
return t.uuid = function () {
return n++;
}, t.prototype.getAbsolutePosition = function (t) {
if (!t) return this.getAbsolutePosition(this);
if (!t.parent) return {
left: 0,
top: 0
};
var e = this.getAbsolutePosition(t.parent),
o = e.left,
r = e.top;
return {
left: o + t.layoutBox.left,
top: r + t.layoutBox.top
};
}, t.prototype.add = function (t) {
t.parent = this, this.children[t.id] = t;
}, t.prototype.remove = function (t) {
var e = this;
t ? this.children[t.id] && (t.remove(), delete this.children[t.id]) : Object.keys(this.children).forEach(function (t) {
e.children[t].remove(), delete e.children[t];
});
}, t.prototype.getNodeTree = function () {
var t = this;
return {
id: this.id,
style: this.computedStyle,
children: Object.keys(this.children).map(function (e) {
return t.children[e].getNodeTree();
})
};
}, t.prototype.applyLayout = function (t) {
var e = this;
["left", "top", "width", "height"].forEach(function (o) {
t.layout && "number" == typeof t.layout[o] && (e.layoutBox[o] = t.layout[o], !e.parent || "left" !== o && "top" !== o || (e.layoutBox[o] += e.parent.layoutBox[o]));
}), t.children.forEach(function (t) {
e.children[t.id].applyLayout(t);
});
}, t.prototype.layout = function () {
var t = this.getNodeTree();
i.default(t), this.applyLayout(t);
}, t;
}();
e.default = a;
}, function (t, e, o) {
o.r(e);
var r = function () {
var t,
e = "inherit",
o = "ltr",
r = "rtl",
i = "row",
l = "row-reverse",
n = "column",
a = "column-reverse",
u = "flex-start",
d = "center",
s = "flex-end",
y = "space-between",
c = "space-around",
f = "flex-start",
h = "center",
p = "flex-end",
g = "stretch",
v = "relative",
m = "absolute",
b = {
row: "left",
"row-reverse": "right",
column: "top",
"column-reverse": "bottom"
},
x = {
row: "right",
"row-reverse": "left",
column: "bottom",
"column-reverse": "top"
},
w = {
row: "left",
"row-reverse": "right",
column: "top",
"column-reverse": "bottom"
},
S = {
row: "width",
"row-reverse": "width",
column: "height",
"column-reverse": "height"
};
function W(t) {
return void 0 === t;
}
function L(t) {
return t === i || t === l;
}
function k(t, e) {
if (void 0 !== t.style.marginStart && L(e)) return t.style.marginStart;
var o = null;
switch (e) {
case "row":
o = t.style.marginLeft;
break;
case "row-reverse":
o = t.style.marginRight;
break;
case "column":
o = t.style.marginTop;
break;
case "column-reverse":
o = t.style.marginBottom;
}
return void 0 !== o ? o : void 0 !== t.style.margin ? t.style.margin : 0;
}
function j(t, e) {
if (void 0 !== t.style.marginEnd && L(e)) return t.style.marginEnd;
var o = null;
switch (e) {
case "row":
o = t.style.marginRight;
break;
case "row-reverse":
o = t.style.marginLeft;
break;
case "column":
o = t.style.marginBottom;
break;
case "column-reverse":
o = t.style.marginTop;
}
return null != o ? o : void 0 !== t.style.margin ? t.style.margin : 0;
}
function B(t, e) {
if (void 0 !== t.style.borderStartWidth && t.style.borderStartWidth >= 0 && L(e)) return t.style.borderStartWidth;
var o = null;
switch (e) {
case "row":
o = t.style.borderLeftWidth;
break;
case "row-reverse":
o = t.style.borderRightWidth;
break;
case "column":
o = t.style.borderTopWidth;
break;
case "column-reverse":
o = t.style.borderBottomWidth;
}
return null != o && o >= 0 ? o : void 0 !== t.style.borderWidth && t.style.borderWidth >= 0 ? t.style.borderWidth : 0;
}
function E(t, e) {
if (void 0 !== t.style.borderEndWidth && t.style.borderEndWidth >= 0 && L(e)) return t.style.borderEndWidth;
var o = null;
switch (e) {
case "row":
o = t.style.borderRightWidth;
break;
case "row-reverse":
o = t.style.borderLeftWidth;
break;
case "column":
o = t.style.borderBottomWidth;
break;
case "column-reverse":
o = t.style.borderTopWidth;
}
return null != o && o >= 0 ? o : void 0 !== t.style.borderWidth && t.style.borderWidth >= 0 ? t.style.borderWidth : 0;
}
function C(t, e) {
return function (t, e) {
if (void 0 !== t.style.paddingStart && t.style.paddingStart >= 0 && L(e)) return t.style.paddingStart;
var o = null;
switch (e) {
case "row":
o = t.style.paddingLeft;
break;
case "row-reverse":
o = t.style.paddingRight;
break;
case "column":
o = t.style.paddingTop;
break;
case "column-reverse":
o = t.style.paddingBottom;
}
return null != o && o >= 0 ? o : void 0 !== t.style.padding && t.style.padding >= 0 ? t.style.padding : 0;
}(t, e) + B(t, e);
}
function T(t, e) {
return function (t, e) {
if (void 0 !== t.style.paddingEnd && t.style.paddingEnd >= 0 && L(e)) return t.style.paddingEnd;
var o = null;
switch (e) {
case "row":
o = t.style.paddingRight;
break;
case "row-reverse":
o = t.style.paddingLeft;
break;
case "column":
o = t.style.paddingBottom;
break;
case "column-reverse":
o = t.style.paddingTop;
}
return null != o && o >= 0 ? o : void 0 !== t.style.padding && t.style.padding >= 0 ? t.style.padding : 0;
}(t, e) + E(t, e);
}
function O(t, e) {
return B(t, e) + E(t, e);
}
function _(t, e) {
return k(t, e) + j(t, e);
}
function R(t, e) {
return C(t, e) + T(t, e);
}
function A(t, e) {
return e.style.alignSelf ? e.style.alignSelf : t.style.alignItems ? t.style.alignItems : "stretch";
}
function P(t, e) {
if (e === r) {
if (t === i) return l;
if (t === l) return i;
}
return t;
}
function D(t, e) {
return function (t) {
return t === n || t === a;
}(t) ? P(i, e) : n;
}
function H(t) {
return t.style.position ? t.style.position : "relative";
}
function M(t) {
return H(t) === v && t.style.flex > 0;
}
function I(t, e) {
return t.layout[S[e]] + _(t, e);
}
function N(t, e) {
return void 0 !== t.style[S[e]] && t.style[S[e]] >= 0;
}
function F(t, e) {
return void 0 !== t.style[e];
}
function q(t, e) {
return void 0 !== t.style[e] ? t.style[e] : 0;
}
function z(t, e, o) {
var r = {
row: t.style.minWidth,
"row-reverse": t.style.minWidth,
column: t.style.minHeight,
"column-reverse": t.style.minHeight
}[e],
i = {
row: t.style.maxWidth,
"row-reverse": t.style.maxWidth,
column: t.style.maxHeight,
"column-reverse": t.style.maxHeight
}[e],
l = o;
return void 0 !== i && i >= 0 && l > i && (l = i), void 0 !== r && r >= 0 && l < r && (l = r), l;
}
function U(t, e) {
return t > e ? t : e;
}
function G(t, e) {
void 0 === t.layout[S[e]] && N(t, e) && (t.layout[S[e]] = U(z(t, e, t.style[S[e]]), R(t, e)));
}
function J(t, e, o) {
e.layout[x[o]] = t.layout[S[o]] - e.layout[S[o]] - e.layout[w[o]];
}
function K(t, e) {
return void 0 !== t.style[b[e]] ? q(t, b[e]) : -q(t, x[e]);
}
function Q(r, E, Q) {
var X = function (t, r) {
var i;
return (i = t.style.direction ? t.style.direction : e) === e && (i = void 0 === r ? o : r), i;
}(r, Q),
Y = P(function (t) {
return t.style.flexDirection ? t.style.flexDirection : n;
}(r), X),
Z = D(Y, X),
$ = P(i, X);
G(r, Y), G(r, Z), r.layout.direction = X, r.layout[b[Y]] += k(r, Y) + K(r, Y), r.layout[x[Y]] += j(r, Y) + K(r, Y), r.layout[b[Z]] += k(r, Z) + K(r, Z), r.layout[x[Z]] += j(r, Z) + K(r, Z);
var tt = r.children.length,
et = R(r, $);
if (function (t) {
return void 0 !== t.style.measure;
}(r)) {
var ot = !W(r.layout[S[$]]),
rt = t;
rt = N(r, $) ? r.style.width : ot ? r.layout[S[$]] : E - _(r, $), rt -= et;
var it = !N(r, $) && !ot,
lt = !N(r, n) && W(r.layout[S[n]]);
if (it || lt) {
var nt = r.style.measure(rt);
it && (r.layout.width = nt.width + et), lt && (r.layout.height = nt.height + R(r, n));
}
if (0 === tt) return;
}
var at,
ut,
dt,
st,
yt = function (t) {
return "wrap" === t.style.flexWrap;
}(r),
ct = function (t) {
return t.style.justifyContent ? t.style.justifyContent : "flex-start";
}(r),
ft = C(r, Y),
ht = C(r, Z),
pt = R(r, Y),
gt = R(r, Z),
vt = !W(r.layout[S[Y]]),
mt = !W(r.layout[S[Z]]),
bt = L(Y),
xt = null,
wt = null,
St = t;
vt && (St = r.layout[S[Y]] - pt);
for (var Wt = 0, Lt = 0, kt = 0, jt = 0, Bt = 0, Et = 0; Lt < tt;) {
var Ct,
Tt = 0,
Ot = 0,
_t = 0,
Rt = 0,
At = vt && ct === u || !vt && ct !== d,
Pt = At ? tt : Wt,
Dt = !0,
Ht = tt,
Mt = null,
It = null,
Nt = ft,
Ft = 0;
for (at = Wt; at < tt; ++at) {
if ((dt = r.children[at]).lineIndex = Et, dt.nextAbsoluteChild = null, dt.nextFlexChild = null, (Xt = A(r, dt)) === g && H(dt) === v && mt && !N(dt, Z)) dt.layout[S[Z]] = U(z(dt, Z, r.layout[S[Z]] - gt - _(dt, Z)), R(dt, Z));else if (H(dt) === m) for (null === xt && (xt = dt), null !== wt && (wt.nextAbsoluteChild = dt), wt = dt, ut = 0; ut < 2; ut++) st = 0 !== ut ? i : n, !W(r.layout[S[st]]) && !N(dt, st) && F(dt, b[st]) && F(dt, x[st]) && (dt.layout[S[st]] = U(z(dt, st, r.layout[S[st]] - R(r, st) - _(dt, st) - q(dt, b[st]) - q(dt, x[st])), R(dt, st)));
var qt = 0;
if (vt && M(dt) ? (Ot++, _t += dt.style.flex, null === Mt && (Mt = dt), null !== It && (It.nextFlexChild = dt), It = dt, qt = R(dt, Y) + _(dt, Y)) : (Ct = t, bt || (Ct = N(r, $) ? r.layout[S[$]] - et : E - _(r, $) - et), 0 === kt && V(dt, Ct, X), H(dt) === v && (Rt++, qt = I(dt, Y))), yt && vt && Tt + qt > St && at !== Wt) {
Rt--, kt = 1;
break;
}
At && (H(dt) !== v || M(dt)) && (At = !1, Pt = at), Dt && (H(dt) !== v || Xt !== g && Xt !== f || W(dt.layout[S[Z]])) && (Dt = !1, Ht = at), At && (dt.layout[w[Y]] += Nt, vt && J(r, dt, Y), Nt += I(dt, Y), Ft = U(Ft, z(dt, Z, I(dt, Z)))), Dt && (dt.layout[w[Z]] += jt + ht, mt && J(r, dt, Z)), kt = 0, Tt += qt, Lt = at + 1;
}
var zt = 0,
Ut = 0,
Gt = 0;
if (Gt = vt ? St - Tt : U(Tt, 0) - Tt, 0 !== Ot) {
var Jt,
Kt,
Qt = Gt / _t;
for (It = Mt; null !== It;) (Jt = Qt * It.style.flex + R(It, Y)) !== (Kt = z(It, Y, Jt)) && (Gt -= Kt, _t -= It.style.flex), It = It.nextFlexChild;
for ((Qt = Gt / _t) < 0 && (Qt = 0), It = Mt; null !== It;) It.layout[S[Y]] = z(It, Y, Qt * It.style.flex + R(It, Y)), Ct = t, N(r, $) ? Ct = r.layout[S[$]] - et : bt || (Ct = E - _(r, $) - et), V(It, Ct, X), dt = It, It = It.nextFlexChild, dt.nextFlexChild = null;
} else ct !== u && (ct === d ? zt = Gt / 2 : ct === s ? zt = Gt : ct === y ? (Gt = U(Gt, 0), Ut = Ot + Rt - 1 != 0 ? Gt / (Ot + Rt - 1) : 0) : ct === c && (zt = (Ut = Gt / (Ot + Rt)) / 2));
for (Nt += zt, at = Pt; at < Lt; ++at) H(dt = r.children[at]) === m && F(dt, b[Y]) ? dt.layout[w[Y]] = q(dt, b[Y]) + B(r, Y) + k(dt, Y) : (dt.layout[w[Y]] += Nt, vt && J(r, dt, Y), H(dt) === v && (Nt += Ut + I(dt, Y), Ft = U(Ft, z(dt, Z, I(dt, Z)))));
var Vt = r.layout[S[Z]];
for (mt || (Vt = U(z(r, Z, Ft + gt), gt)), at = Ht; at < Lt; ++at) if (H(dt = r.children[at]) === m && F(dt, b[Z])) dt.layout[w[Z]] = q(dt, b[Z]) + B(r, Z) + k(dt, Z);else {
var Xt,
Yt = ht;
if (H(dt) === v) if ((Xt = A(r, dt)) === g) W(dt.layout[S[Z]]) && (dt.layout[S[Z]] = U(z(dt, Z, Vt - gt - _(dt, Z)), R(dt, Z)));else if (Xt !== f) {
var Zt = Vt - gt - I(dt, Z);
Yt += Xt === h ? Zt / 2 : Zt;
}
dt.layout[w[Z]] += jt + Yt, mt && J(r, dt, Z);
}
jt += Ft, Bt = U(Bt, Nt), Et += 1, Wt = Lt;
}
if (Et > 1 && mt) {
var $t = r.layout[S[Z]] - gt,
te = $t - jt,
ee = 0,
oe = ht,
re = function (t) {
return t.style.alignContent ? t.style.alignContent : "flex-start";
}(r);
re === p ? oe += te : re === h ? oe += te / 2 : re === g && $t > jt && (ee = te / Et);
var ie = 0;
for (at = 0; at < Et; ++at) {
var le = ie,
ne = 0;
for (ut = le; ut < tt; ++ut) if (H(dt = r.children[ut]) === v) {
if (dt.lineIndex !== at) break;
W(dt.layout[S[Z]]) || (ne = U(ne, dt.layout[S[Z]] + _(dt, Z)));
}
for (ie = ut, ne += ee, ut = le; ut < ie; ++ut) if (H(dt = r.children[ut]) === v) {
var ae = A(r, dt);
if (ae === f) dt.layout[w[Z]] = oe + k(dt, Z);else if (ae === p) dt.layout[w[Z]] = oe + ne - j(dt, Z) - dt.layout[S[Z]];else if (ae === h) {
var ue = dt.layout[S[Z]];
dt.layout[w[Z]] = oe + (ne - ue) / 2;
} else ae === g && (dt.layout[w[Z]] = oe + k(dt, Z));
}
oe += ne;
}
}
var de = !1,
se = !1;
if (vt || (r.layout[S[Y]] = U(z(r, Y, Bt + T(r, Y)), pt), Y !== l && Y !== a || (de = !0)), mt || (r.layout[S[Z]] = U(z(r, Z, jt + gt), gt), Z !== l && Z !== a || (se = !0)), de || se) for (at = 0; at < tt; ++at) dt = r.children[at], de && J(r, dt, Y), se && J(r, dt, Z);
for (wt = xt; null !== wt;) {
for (ut = 0; ut < 2; ut++) st = 0 !== ut ? i : n, !W(r.layout[S[st]]) && !N(wt, st) && F(wt, b[st]) && F(wt, x[st]) && (wt.layout[S[st]] = U(z(wt, st, r.layout[S[st]] - O(r, st) - _(wt, st) - q(wt, b[st]) - q(wt, x[st])), R(wt, st))), F(wt, x[st]) && !F(wt, b[st]) && (wt.layout[b[st]] = r.layout[S[st]] - wt.layout[S[st]] - q(wt, x[st]));
dt = wt, wt = wt.nextAbsoluteChild, dt.nextAbsoluteChild = null;
}
}
function V(t, e, r) {
t.shouldUpdate = !0;
var i = t.style.direction || o;
!t.isDirty && t.lastLayout && t.lastLayout.requestedHeight === t.layout.height && t.lastLayout.requestedWidth === t.layout.width && t.lastLayout.parentMaxWidth === e && t.lastLayout.direction === i ? (t.layout.width = t.lastLayout.width, t.layout.height = t.lastLayout.height, t.layout.top = t.lastLayout.top, t.layout.left = t.lastLayout.left) : (t.lastLayout || (t.lastLayout = {}), t.lastLayout.requestedWidth = t.layout.width, t.lastLayout.requestedHeight = t.layout.height, t.lastLayout.parentMaxWidth = e, t.lastLayout.direction = i, t.children.forEach(function (t) {
t.layout.width = void 0, t.layout.height = void 0, t.layout.top = 0, t.layout.left = 0;
}), Q(t, e, r), t.lastLayout.width = t.layout.width, t.lastLayout.height = t.layout.height, t.lastLayout.top = t.layout.top, t.lastLayout.left = t.layout.left);
}
return {
layoutNodeImpl: Q,
computeLayout: V,
fillNodes: function t(e) {
return e.layout && !e.isDirty || (e.layout = {
width: void 0,
height: void 0,
top: 0,
left: 0,
right: 0,
bottom: 0
}), e.style || (e.style = {}), e.children || (e.children = []), e.children.forEach(t), e;
}
};
}();
e.default = function (t) {
r.fillNodes(t), r.computeLayout(t);
};
}, function (t, e, o) {
Object.defineProperty(e, "__esModule", {
value: !0
});
e.textStyles = ["color", "fontSize", "textAlign", "fontWeight", "lineHeight", "lineBreak"];
e.scalableStyles = ["left", "top", "right", "bottom", "width", "height", "margin", "marginLeft", "marginRight", "marginTop", "marginBottom", "padding", "paddingLeft", "paddingRight", "paddingTop", "paddingBottom", "borderWidth", "borderLeftWidth", "borderRightWidth", "borderTopWidth", "borderBottomWidth"];
e.layoutAffectedStyles = ["margin", "marginTop", "marginBottom", "marginLeft", "marginRight", "padding", "paddingTop", "paddingBottom", "paddingLeft", "paddingRight", "width", "height"];
e.getDefaultStyle = function () {
return {
left: void 0,
top: void 0,
right: void 0,
bottom: void 0,
width: void 0,
height: void 0,
maxWidth: void 0,
maxHeight: void 0,
minWidth: void 0,
minHeight: void 0,
margin: void 0,
marginLeft: void 0,
marginRight: void 0,
marginTop: void 0,
marginBottom: void 0,
padding: void 0,
paddingLeft: void 0,
paddingRight: void 0,
paddingTop: void 0,
paddingBottom: void 0,
borderWidth: void 0,
flexDirection: void 0,
justifyContent: void 0,
alignItems: void 0,
alignSelf: void 0,
flex: void 0,
flexWrap: void 0,
position: void 0,
hidden: !1,
scale: 1
};
};
}]).default;
});
}, function (modId) {
var map = {};
return __REQUIRE__(map[modId], modId);
});
return __REQUIRE__(1572960819414);
}(); //# sourceMappingURL=index.js.map

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const textStyles: string[] = ["color", "fontSize", "textAlign", "fontWeight", "lineHeight", "lineBreak"];
const scalableStyles: string[] = ["left", "top", "right", "bottom", "width", "height",
"margin", "marginLeft", "marginRight", "marginTop", "marginBottom",
"padding", "paddingLeft", "paddingRight", "paddingTop", "paddingBottom",
"borderWidth", "borderLeftWidth", "borderRightWidth", "borderTopWidth", "borderBottomWidth"];
const layoutAffectedStyles: string[] = [
"margin", "marginTop", "marginBottom", "marginLeft", "marginRight",
"padding", "paddingTop", "paddingBottom", "paddingLeft", "paddingRight",
"width", "height"];
type Style = {
left: number,
top: number,
right: number,
bottom: number,
width: number,
height: number,
maxWidth: number,
maxHeight: number,
minWidth: number,
minHeight: number,
margin: number,
marginLeft: number,
marginRight: number,
marginTop: number,
marginBottom: number,
padding: number,
paddingLeft: number,
paddingRight: number,
paddingTop: number,
paddingBottom: number,
borderWidth: number,
borderLeftWidth: number,
borderRightWidth: number,
borderTopWidth: number,
borderBottomWidth: number,
flexDirection: "column" | "row",
justifyContent: "flex-start" | "center" | "flex-end" | "space-between" | "space-around",
alignItems: "flex-start" | "center" | "flex-end" | "stretch",
alignSelf: "flex-start" | "center" | "flex-end" | "stretch",
flex: number,
flexWrap: "wrap" | "nowrap",
position: "relative" | "absolute",
hidden: boolean,
scale: number
}
const getDefaultStyle = () => ({
left: undefined,
top: undefined,
right: undefined,
bottom: undefined,
width: undefined,
height: undefined,
maxWidth: undefined,
maxHeight: undefined,
minWidth: undefined,
minHeight: undefined,
margin: undefined,
marginLeft: undefined,
marginRight: undefined,
marginTop: undefined,
marginBottom: undefined,
padding: undefined,
paddingLeft: undefined,
paddingRight: undefined,
paddingTop: undefined,
paddingBottom: undefined,
borderWidth: undefined,
flexDirection: undefined,
justifyContent: undefined,
alignItems: undefined,
alignSelf: undefined,
flex: undefined,
flexWrap: undefined,
position: undefined,
hidden: false,
scale: 1
})
export {
getDefaultStyle, scalableStyles, textStyles, layoutAffectedStyles
}

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class Draw {
constructor(canvas, context) {
this.canvas = canvas;
this.ctx = context;
}
roundRect(x, y, w, h, r, fill = true, stroke = false) {
if (r < 0) return;
const ctx = this.ctx;
ctx.beginPath();
ctx.arc(x + r, y + r, r, Math.PI, Math.PI * 3 / 2);
ctx.arc(x + w - r, y + r, r, Math.PI * 3 / 2, 0);
ctx.arc(x + w - r, y + h - r, r, 0, Math.PI / 2);
ctx.arc(x + r, y + h - r, r, Math.PI / 2, Math.PI);
ctx.lineTo(x, y + r);
if (stroke) ctx.stroke();
if (fill) ctx.fill();
}
drawView(box, style) {
const ctx = this.ctx;
const {
left: x,
top: y,
width: w,
height: h
} = box;
const {
borderRadius = 0,
borderWidth = 0,
borderColor,
color = '#000',
backgroundColor = 'transparent'
} = style;
ctx.save(); // 外环
if (borderWidth > 0) {
ctx.fillStyle = borderColor || color;
this.roundRect(x, y, w, h, borderRadius);
} // 内环
ctx.fillStyle = backgroundColor;
const innerWidth = w - 2 * borderWidth;
const innerHeight = h - 2 * borderWidth;
const innerRadius = borderRadius - borderWidth >= 0 ? borderRadius - borderWidth : 0;
this.roundRect(x + borderWidth, y + borderWidth, innerWidth, innerHeight, innerRadius);
ctx.restore();
}
async drawImage(img, box, style) {
await new Promise((resolve, reject) => {
const ctx = this.ctx;
const canvas = this.canvas;
const {
borderRadius = 0
} = style;
const {
left: x,
top: y,
width: w,
height: h
} = box;
ctx.save();
this.roundRect(x, y, w, h, borderRadius, false, false);
ctx.clip();
const Image = canvas.createImage();
Image.onload = () => {
ctx.drawImage(Image, x, y, w, h);
ctx.restore();
resolve();
};
Image.onerror = () => {
reject();
};
Image.src = img;
});
} // eslint-disable-next-line complexity
drawText(text, box, style) {
const ctx = this.ctx;
let {
left: x,
top: y,
width: w,
height: h
} = box;
let {
color = '#000',
lineHeight = '1.4em',
fontSize = 14,
textAlign = 'left',
verticalAlign = 'top',
backgroundColor = 'transparent'
} = style;
if (!text || lineHeight > h) return;
ctx.save();
if (lineHeight) {
// 2em
lineHeight = Math.ceil(parseFloat(lineHeight.replace('em')) * fontSize);
}
ctx.textBaseline = 'top';
ctx.font = `${fontSize}px sans-serif`;
ctx.textAlign = textAlign; // 背景色
ctx.fillStyle = backgroundColor;
this.roundRect(x, y, w, h, 0); // 文字颜色
ctx.fillStyle = color; // 水平布局
switch (textAlign) {
case 'left':
break;
case 'center':
x += 0.5 * w;
break;
case 'right':
x += w;
break;
default:
break;
}
const textWidth = ctx.measureText(text).width;
const actualHeight = Math.ceil(textWidth / w) * lineHeight;
let paddingTop = Math.ceil((h - actualHeight) / 2);
if (paddingTop < 0) paddingTop = 0; // 垂直布局
switch (verticalAlign) {
case 'top':
break;
case 'middle':
y += paddingTop;
break;
case 'bottom':
y += 2 * paddingTop;
break;
default:
break;
}
const inlinePaddingTop = Math.ceil((lineHeight - fontSize) / 2); // 不超过一行
if (textWidth <= w) {
ctx.fillText(text, x, y + inlinePaddingTop);
return;
} // 多行文本
const chars = text.split('');
const _y = y; // 逐行绘制
let line = '';
for (const ch of chars) {
const testLine = line + ch;
const testWidth = ctx.measureText(testLine).width;
if (testWidth > w) {
ctx.fillText(line, x, y + inlinePaddingTop);
y += lineHeight;
line = ch;
if (y + lineHeight > _y + h) break;
} else {
line = testLine;
}
} // 避免溢出
if (y + lineHeight <= _y + h) {
ctx.fillText(line, x, y + inlinePaddingTop);
}
ctx.restore();
}
async drawNode(element) {
const {
layoutBox,
computedStyle,
name
} = element;
const {
src,
text
} = element.attributes;
if (name === 'view') {
this.drawView(layoutBox, computedStyle);
} else if (name === 'image') {
await this.drawImage(src, layoutBox, computedStyle);
} else if (name === 'text') {
this.drawText(text, layoutBox, computedStyle);
}
const childs = Object.values(element.children);
for (const child of childs) {
await this.drawNode(child);
}
}
}
module.exports = {
Draw
};

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@@ -0,0 +1,34 @@
const $filterNullChildren = children => {
children = deepFlatten(children);
return children.filter(child => child != null);
};
const deepFlatten = arr => {
let flatten = arr => [].concat(...arr);
return flatten(arr.map(x => Array.isArray(x) ? deepFlatten(x) : x));
};
export default ((data, opt) => {
const {
View,
Text,
Image
} = opt;
Object.assign(data, {});
return new View({
style: {},
attr: {
"needRoot": true
},
children: $filterNullChildren([new Canvas({
style: {},
attr: {
"id": "canvas",
"type": "2d",
"style": "width: " + data.width + "px; height: " + data.height + "px;"
},
children: $filterNullChildren([])
})])
});
});

View File

@@ -0,0 +1,109 @@
<template>
<view>
<canvas id="canvas" type="2d" :style="'width: ' + width + 'px; height: ' + height + 'px;'"></canvas>
</view>
</template>
<script>
const xmlParse = require("./xml-parser");
const {
Widget
} = require("./widget");
const {
Draw
} = require("./draw");
export default {
data() {
return {};
},
components: {},
props: {
width: {
type: Number,
default: 400
},
height: {
type: Number,
default: 300
}
},
beforeMount() {
const dpr = wx.getSystemInfoSync().pixelRatio;
const query = this.createSelectorQuery();
this.dpr = dpr;
query.select('#canvas').fields({
node: true,
size: true
}).exec(res => {
console.log(res, "==res");
const canvas = res[0].node;
const ctx = canvas.getContext('2d');
canvas.width = res[0].width * dpr;
canvas.height = res[0].height * dpr;
ctx.scale(dpr, dpr);
this.ctx = ctx;
this.canvas = canvas;
});
},
methods: {
async renderToCanvas(args) {
const {
wxml,
style
} = args; // 清空画布
const ctx = this.ctx;
const canvas = this.canvas;
if (!ctx || !canvas) {
return Promise.reject(new Error('renderToCanvas: fail canvas has not been created'));
}
ctx.clearRect(0, 0, this.width, this.height);
const {
root: xom
} = xmlParse(wxml);
const widget = new Widget(xom, style);
const container = widget.init();
this.boundary = {
top: container.layoutBox.top,
left: container.layoutBox.left,
width: container.computedStyle.width,
height: container.computedStyle.height
};
const draw = new Draw(canvas, ctx);
await draw.drawNode(container);
return Promise.resolve(container);
},
canvasToTempFilePath(args = {}) {
return new Promise((resolve, reject) => {
const {
top,
left,
width,
height
} = this.boundary;
wx.canvasToTempFilePath({
x: left,
y: top,
width,
height,
destWidth: width * this.dpr,
destHeight: height * this.dpr,
canvas: this.canvas,
fileType: args.fileType || 'png',
quality: args.quality || 1,
success: resolve,
fail: reject
});
});
}
}
};
</script>

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const hex = color => {
let result = null;
if (/^#/.test(color) && (color.length === 7 || color.length === 9)) {
return color; // eslint-disable-next-line no-cond-assign
} else if ((result = /^(rgb|rgba)\((.+)\)/.exec(color)) !== null) {
return '#' + result[2].split(',').map((part, index) => {
part = part.trim();
part = index === 3 ? Math.floor(parseFloat(part) * 255) : parseInt(part, 10);
part = part.toString(16);
if (part.length === 1) {
part = '0' + part;
}
return part;
}).join('');
} else {
return '#00000000';
}
};
const splitLineToCamelCase = str => str.split('-').map((part, index) => {
if (index === 0) {
return part;
}
return part[0].toUpperCase() + part.slice(1);
}).join('');
module.exports = {
hex,
splitLineToCamelCase
};

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const Block = require("@/components/miniprogram_npm/widget-ui/index.js");
const {
splitLineToCamelCase
} = require("./utils.js");
class Element extends Block {
constructor(prop) {
super(prop.style);
this.name = prop.name;
this.attributes = prop.attributes;
}
}
class Widget {
constructor(xom, style) {
this.xom = xom;
this.style = style;
this.inheritProps = ['fontSize', 'lineHeight', 'textAlign', 'verticalAlign', 'color'];
}
init() {
this.container = this.create(this.xom);
this.container.layout();
this.inheritStyle(this.container);
return this.container;
} // 继承父节点的样式
inheritStyle(node) {
const parent = node.parent || null;
const children = node.children || {};
const computedStyle = node.computedStyle;
if (parent) {
this.inheritProps.forEach(prop => {
computedStyle[prop] = computedStyle[prop] || parent.computedStyle[prop];
});
}
Object.values(children).forEach(child => {
this.inheritStyle(child);
});
}
create(node) {
let classNames = (node.attributes.class || '').split(' ');
classNames = classNames.map(item => splitLineToCamelCase(item.trim()));
const style = {};
classNames.forEach(item => {
Object.assign(style, this.style[item] || {});
});
const args = {
name: node.name,
style
};
const attrs = Object.keys(node.attributes);
const attributes = {};
for (const attr of attrs) {
const value = node.attributes[attr];
const CamelAttr = splitLineToCamelCase(attr);
if (value === '' || value === 'true') {
attributes[CamelAttr] = true;
} else if (value === 'false') {
attributes[CamelAttr] = false;
} else {
attributes[CamelAttr] = value;
}
}
attributes.text = node.content;
args.attributes = attributes;
const element = new Element(args);
node.children.forEach(childNode => {
const childElement = this.create(childNode);
element.add(childElement);
});
return element;
}
}
module.exports = {
Widget
};

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/**
* Module dependencies.
*/
/**
* Expose `parse`.
*/
/**
* Parse the given string of `xml`.
*
* @param {String} xml
* @return {Object}
* @api public
*/
function parse(xml) {
xml = xml.trim(); // strip comments
xml = xml.replace(/<!--[\s\S]*?-->/g, '');
return document();
/**
* XML document.
*/
function document() {
return {
declaration: declaration(),
root: tag()
};
}
/**
* Declaration.
*/
function declaration() {
const m = match(/^<\?xml\s*/);
if (!m) return; // tag
const node = {
attributes: {}
}; // attributes
while (!(eos() || is('?>'))) {
const attr = attribute();
if (!attr) return node;
node.attributes[attr.name] = attr.value;
}
match(/\?>\s*/);
return node;
}
/**
* Tag.
*/
function tag() {
const m = match(/^<([\w-:.]+)\s*/);
if (!m) return; // name
const node = {
name: m[1],
attributes: {},
children: []
}; // attributes
while (!(eos() || is('>') || is('?>') || is('/>'))) {
const attr = attribute();
if (!attr) return node;
node.attributes[attr.name] = attr.value;
} // self closing tag
if (match(/^\s*\/>\s*/)) {
return node;
}
match(/\??>\s*/); // content
node.content = content(); // children
let child;
while (child = tag()) {
node.children.push(child);
} // closing
match(/^<\/[\w-:.]+>\s*/);
return node;
}
/**
* Text content.
*/
function content() {
const m = match(/^([^<]*)/);
if (m) return m[1];
return '';
}
/**
* Attribute.
*/
function attribute() {
const m = match(/([\w:-]+)\s*=\s*("[^"]*"|'[^']*'|\w+)\s*/);
if (!m) return;
return {
name: m[1],
value: strip(m[2])
};
}
/**
* Strip quotes from `val`.
*/
function strip(val) {
return val.replace(/^['"]|['"]$/g, '');
}
/**
* Match `re` and advance the string.
*/
function match(re) {
const m = xml.match(re);
if (!m) return;
xml = xml.slice(m[0].length);
return m;
}
/**
* End-of-source.
*/
function eos() {
return xml.length == 0;
}
/**
* Check for `prefix`.
*/
function is(prefix) {
return xml.indexOf(prefix) == 0;
}
}
module.exports = parse;