aboutsummaryrefslogtreecommitdiff
path: root/ext/mixed/js/core.js
blob: 813308938249a80630937841990201613d44961b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
/*
 * Copyright (C) 2019-2020  Yomichan Authors
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

/*
 * Error handling
 */

function errorToJson(error) {
    try {
        if (isObject(error)) {
            return {
                name: error.name,
                message: error.message,
                stack: error.stack,
                data: error.data
            };
        }
    } catch (e) {
        // NOP
    }
    return {
        value: error,
        hasValue: true
    };
}

function jsonToError(jsonError) {
    if (jsonError.hasValue) {
        return jsonError.value;
    }
    const error = new Error(jsonError.message);
    error.name = jsonError.name;
    error.stack = jsonError.stack;
    error.data = jsonError.data;
    return error;
}


/*
 * Common helpers
 */

function isObject(value) {
    return typeof value === 'object' && value !== null && !Array.isArray(value);
}

function hasOwn(object, property) {
    return Object.prototype.hasOwnProperty.call(object, property);
}

// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions
function escapeRegExp(string) {
    return string.replace(/[.*+\-?^${}()|[\]\\]/g, '\\$&');
}

function stringReverse(string) {
    return string.split('').reverse().join('').replace(/([\uDC00-\uDFFF])([\uD800-\uDBFF])/g, '$2$1');
}

function parseUrl(url) {
    const parsedUrl = new URL(url);
    const baseUrl = `${parsedUrl.origin}${parsedUrl.pathname}`;
    const queryParams = Array.from(parsedUrl.searchParams.entries())
        .reduce((a, [k, v]) => Object.assign({}, a, {[k]: v}), {});
    return {baseUrl, queryParams};
}

function areSetsEqual(set1, set2) {
    if (set1.size !== set2.size) {
        return false;
    }

    for (const value of set1) {
        if (!set2.has(value)) {
            return false;
        }
    }

    return true;
}

function getSetIntersection(set1, set2) {
    const result = [];
    for (const value of set1) {
        if (set2.has(value)) {
            result.push(value);
        }
    }
    return result;
}

function getSetDifference(set1, set2) {
    return new Set(
        [...set1].filter((value) => !set2.has(value))
    );
}

const clone = (() => {
    // eslint-disable-next-line no-shadow
    function clone(value) {
        if (value === null) { return null; }
        switch (typeof value) {
            case 'boolean':
            case 'number':
            case 'string':
            case 'bigint':
            case 'symbol':
            case 'undefined':
                return value;
            default:
                return cloneInternal(value, new Set());
        }
    }

    function cloneInternal(value, visited) {
        if (value === null) { return null; }
        switch (typeof value) {
            case 'boolean':
            case 'number':
            case 'string':
            case 'bigint':
            case 'symbol':
            case 'undefined':
                return value;
            case 'function':
                return cloneObject(value, visited);
            case 'object':
                return Array.isArray(value) ? cloneArray(value, visited) : cloneObject(value, visited);
        }
    }

    function cloneArray(value, visited) {
        if (visited.has(value)) { throw new Error('Circular'); }
        try {
            visited.add(value);
            const result = [];
            for (const item of value) {
                result.push(cloneInternal(item, visited));
            }
            return result;
        } finally {
            visited.delete(value);
        }
    }

    function cloneObject(value, visited) {
        if (visited.has(value)) { throw new Error('Circular'); }
        try {
            visited.add(value);
            const result = {};
            for (const key in value) {
                if (Object.prototype.hasOwnProperty.call(value, key)) {
                    result[key] = cloneInternal(value[key], visited);
                }
            }
            return result;
        } finally {
            visited.delete(value);
        }
    }

    return clone;
})();

function generateId(length) {
    const array = new Uint8Array(length);
    crypto.getRandomValues(array);
    let id = '';
    for (const value of array) {
        id += value.toString(16).padStart(2, '0');
    }
    return id;
}


/*
 * Async utilities
 */

function deferPromise() {
    let resolve;
    let reject;
    const promise = new Promise((resolve2, reject2) => {
        resolve = resolve2;
        reject = reject2;
    });
    return {promise, resolve, reject};
}

function promiseTimeout(delay, resolveValue) {
    if (delay <= 0) {
        const promise = Promise.resolve(resolveValue);
        promise.resolve = () => {}; // NOP
        promise.reject = () => {}; // NOP
        return promise;
    }

    let timer = null;
    let {promise, resolve, reject} = deferPromise();

    const complete = (callback, value) => {
        if (callback === null) { return; }
        if (timer !== null) {
            clearTimeout(timer);
            timer = null;
        }
        resolve = null;
        reject = null;
        callback(value);
    };

    const resolveWrapper = (value) => complete(resolve, value);
    const rejectWrapper = (value) => complete(reject, value);

    timer = setTimeout(() => {
        timer = null;
        resolveWrapper(resolveValue);
    }, delay);

    promise.resolve = resolveWrapper;
    promise.reject = rejectWrapper;

    return promise;
}

function promiseAnimationFrame(timeout=null) {
    return new Promise((resolve) => {
        let timer = null;
        let frameRequest = null;
        const onFrame = (time) => {
            frameRequest = null;
            if (timer !== null) {
                clearTimeout(timer);
                timer = null;
            }
            resolve({time, timeout: false});
        };
        const onTimeout = () => {
            timer = null;
            if (frameRequest !== null) {
                cancelAnimationFrame(frameRequest);
                frameRequest = null;
            }
            resolve({time: timeout, timeout: true});
        };

        frameRequest = requestAnimationFrame(onFrame);
        if (typeof timeout === 'number') {
            timer = setTimeout(onTimeout, timeout);
        }
    });
}


/*
 * Common classes
 */

class EventDispatcher {
    constructor() {
        this._eventMap = new Map();
    }

    trigger(eventName, details) {
        const callbacks = this._eventMap.get(eventName);
        if (typeof callbacks === 'undefined') { return false; }

        for (const callback of callbacks) {
            callback(details);
        }
    }

    on(eventName, callback) {
        let callbacks = this._eventMap.get(eventName);
        if (typeof callbacks === 'undefined') {
            callbacks = [];
            this._eventMap.set(eventName, callbacks);
        }
        callbacks.push(callback);
    }

    off(eventName, callback) {
        const callbacks = this._eventMap.get(eventName);
        if (typeof callbacks === 'undefined') { return true; }

        const ii = callbacks.length;
        for (let i = 0; i < ii; ++i) {
            if (callbacks[i] === callback) {
                callbacks.splice(i, 1);
                if (callbacks.length === 0) {
                    this._eventMap.delete(eventName);
                }
                return true;
            }
        }
        return false;
    }

    hasListeners(eventName) {
        const callbacks = this._eventMap.get(eventName);
        return (typeof callbacks !== 'undefined' && callbacks.length > 0);
    }
}

class EventListenerCollection {
    constructor() {
        this._eventListeners = [];
    }

    get size() {
        return this._eventListeners.length;
    }

    addGeneric(type, object, ...args) {
        switch (type) {
            case 'addEventListener': return this.addEventListener(object, ...args);
            case 'addListener': return this.addListener(object, ...args);
            case 'on': return this.on(object, ...args);
        }
    }

    addEventListener(object, ...args) {
        object.addEventListener(...args);
        this._eventListeners.push(['removeEventListener', object, ...args]);
    }

    addListener(object, ...args) {
        object.addListener(...args);
        this._eventListeners.push(['removeListener', object, ...args]);
    }

    on(object, ...args) {
        object.on(...args);
        this._eventListeners.push(['off', object, ...args]);
    }

    removeAllEventListeners() {
        if (this._eventListeners.length === 0) { return; }
        for (const [removeFunctionName, object, ...args] of this._eventListeners) {
            switch (removeFunctionName) {
                case 'removeEventListener':
                    object.removeEventListener(...args);
                    break;
                case 'removeListener':
                    object.removeListener(...args);
                    break;
                case 'off':
                    object.off(...args);
                    break;
                default:
                    throw new Error(`Unknown remove function: ${removeFunctionName}`);
            }
        }
        this._eventListeners = [];
    }
}

/**
 * Class representing a generic value with an override stack.
 * Changes can be observed by listening to the 'change' event.
 */
class DynamicProperty extends EventDispatcher {
    /**
     * Creates a new instance with the specified value.
     * @param value The value to assign.
     */
    constructor(value) {
        super();
        this._value = value;
        this._defaultValue = value;
        this._overrides = [];
    }

    /**
     * Gets the default value for the property, which is assigned to the
     * public value property when no overrides are present.
     */
    get defaultValue() {
        return this._defaultValue;
    }

    /**
     * Assigns the default value for the property. If no overrides are present
     * and if the value is different than the current default value,
     * the 'change' event will be triggered.
     * @param value The value to assign.
     */
    set defaultValue(value) {
        this._defaultValue = value;
        if (this._overrides.length === 0) { this._updateValue(); }
    }

    /**
     * Gets the current value for the property, taking any overrides into account.
     */
    get value() {
        return this._value;
    }

    /**
     * Gets the number of overrides added to the property.
     */
    get overrideCount() {
        return this._overrides.length;
    }

    /**
     * Adds an override value with the specified priority to the override stack.
     * Values with higher priority will take precedence over those with lower.
     * For tie breaks, the override value added first will take precedence.
     * If the newly added override has the highest priority of all overrides
     * and if the override value is different from the current value,
     * the 'change' event will be fired.
     * @param value The override value to assign.
     * @param priority The priority value to use, as a number.
     * @returns A string token which can be passed to the clearOverride function
     *  to remove the override.
     */
    setOverride(value, priority=0) {
        const overridesCount = this._overrides.length;
        let i = 0;
        for (; i < overridesCount; ++i) {
            if (priority > this._overrides[i].priority) { break; }
        }
        const token = generateId(16);
        this._overrides.splice(i, 0, {value, priority, token});
        if (i === 0) { this._updateValue(); }
        return token;
    }

    /**
     * Removes a specific override value. If the removed override
     * had the highest priority, and the new value is different from
     * the previous value, the 'change' event will be fired.
     * @param token The token for the corresponding override which is to be removed.
     * @returns true if an override was returned, false otherwise.
     */
    clearOverride(token) {
        for (let i = 0, ii = this._overrides.length; i < ii; ++i) {
            if (this._overrides[i].token === token) {
                this._overrides.splice(i, 1);
                if (i === 0) { this._updateValue(); }
                return true;
            }
        }
        return false;
    }

    /**
     * Updates the current value using the current overrides and default value.
     * If the new value differs from the previous value, the 'change' event will be fired.
     */
    _updateValue() {
        const value = this._overrides.length > 0 ? this._overrides[0].value : this._defaultValue;
        if (this._value === value) { return; }
        this._value = value;
        this.trigger('change', {value});
    }
}