547 lines
15 KiB
JavaScript
547 lines
15 KiB
JavaScript
/*
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* Copyright (C) 2019-2021 Yomichan Authors
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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/*
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* Error handling
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*/
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function errorToJson(error) {
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try {
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if (isObject(error)) {
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return {
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name: error.name,
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message: error.message,
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stack: error.stack,
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data: error.data
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};
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}
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} catch (e) {
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// NOP
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}
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return {
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value: error,
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hasValue: true
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};
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}
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function jsonToError(jsonError) {
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if (jsonError.hasValue) {
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return jsonError.value;
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}
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const error = new Error(jsonError.message);
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error.name = jsonError.name;
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error.stack = jsonError.stack;
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error.data = jsonError.data;
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return error;
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}
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/*
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* Common helpers
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*/
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function isObject(value) {
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return typeof value === 'object' && value !== null && !Array.isArray(value);
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}
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function hasOwn(object, property) {
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return Object.prototype.hasOwnProperty.call(object, property);
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}
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// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions
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function escapeRegExp(string) {
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return string.replace(/[.*+\-?^${}()|[\]\\]/g, '\\$&');
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}
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function stringReverse(string) {
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return string.split('').reverse().join('').replace(/([\uDC00-\uDFFF])([\uD800-\uDBFF])/g, '$2$1');
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}
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function parseUrl(url) {
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const parsedUrl = new URL(url);
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const baseUrl = `${parsedUrl.origin}${parsedUrl.pathname}`;
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const queryParams = Array.from(parsedUrl.searchParams.entries())
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.reduce((a, [k, v]) => Object.assign({}, a, {[k]: v}), {});
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return {baseUrl, queryParams};
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}
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function areSetsEqual(set1, set2) {
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if (set1.size !== set2.size) {
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return false;
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}
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for (const value of set1) {
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if (!set2.has(value)) {
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return false;
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}
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}
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return true;
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}
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function getSetIntersection(set1, set2) {
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const result = [];
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for (const value of set1) {
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if (set2.has(value)) {
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result.push(value);
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}
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}
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return result;
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}
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function getSetDifference(set1, set2) {
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return new Set(
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[...set1].filter((value) => !set2.has(value))
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);
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}
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const clone = (() => {
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// eslint-disable-next-line no-shadow
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function clone(value) {
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if (value === null) { return null; }
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switch (typeof value) {
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case 'boolean':
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case 'number':
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case 'string':
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case 'bigint':
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case 'symbol':
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case 'undefined':
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return value;
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default:
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return cloneInternal(value, new Set());
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}
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}
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function cloneInternal(value, visited) {
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if (value === null) { return null; }
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switch (typeof value) {
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case 'boolean':
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case 'number':
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case 'string':
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case 'bigint':
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case 'symbol':
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case 'undefined':
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return value;
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case 'function':
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return cloneObject(value, visited);
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case 'object':
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return Array.isArray(value) ? cloneArray(value, visited) : cloneObject(value, visited);
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}
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}
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function cloneArray(value, visited) {
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if (visited.has(value)) { throw new Error('Circular'); }
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try {
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visited.add(value);
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const result = [];
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for (const item of value) {
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result.push(cloneInternal(item, visited));
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}
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return result;
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} finally {
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visited.delete(value);
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}
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}
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function cloneObject(value, visited) {
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if (visited.has(value)) { throw new Error('Circular'); }
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try {
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visited.add(value);
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const result = {};
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for (const key in value) {
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if (Object.prototype.hasOwnProperty.call(value, key)) {
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result[key] = cloneInternal(value[key], visited);
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}
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}
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return result;
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} finally {
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visited.delete(value);
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}
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}
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return clone;
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})();
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const deepEqual = (() => {
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// eslint-disable-next-line no-shadow
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function deepEqual(value1, value2) {
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if (value1 === value2) { return true; }
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const type = typeof value1;
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if (typeof value2 !== type) { return false; }
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switch (type) {
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case 'object':
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case 'function':
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return deepEqualInternal(value1, value2, new Set());
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default:
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return false;
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}
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}
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function deepEqualInternal(value1, value2, visited1) {
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if (value1 === value2) { return true; }
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const type = typeof value1;
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if (typeof value2 !== type) { return false; }
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switch (type) {
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case 'object':
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case 'function':
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{
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if (value1 === null || value2 === null) { return false; }
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const array = Array.isArray(value1);
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if (array !== Array.isArray(value2)) { return false; }
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if (visited1.has(value1)) { return false; }
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visited1.add(value1);
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return array ? areArraysEqual(value1, value2, visited1) : areObjectsEqual(value1, value2, visited1);
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}
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default:
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return false;
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}
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}
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function areObjectsEqual(value1, value2, visited1) {
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const keys1 = Object.keys(value1);
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const keys2 = Object.keys(value2);
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if (keys1.length !== keys2.length) { return false; }
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const keys1Set = new Set(keys1);
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for (const key of keys2) {
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if (!keys1Set.has(key) || !deepEqualInternal(value1[key], value2[key], visited1)) { return false; }
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}
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return true;
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}
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function areArraysEqual(value1, value2, visited1) {
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const length = value1.length;
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if (length !== value2.length) { return false; }
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for (let i = 0; i < length; ++i) {
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if (!deepEqualInternal(value1[i], value2[i], visited1)) { return false; }
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}
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return true;
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}
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return deepEqual;
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})();
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function generateId(length) {
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const array = new Uint8Array(length);
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crypto.getRandomValues(array);
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let id = '';
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for (const value of array) {
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id += value.toString(16).padStart(2, '0');
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}
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return id;
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}
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/*
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* Async utilities
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*/
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function deferPromise() {
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let resolve;
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let reject;
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const promise = new Promise((resolve2, reject2) => {
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resolve = resolve2;
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reject = reject2;
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});
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return {promise, resolve, reject};
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}
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function promiseTimeout(delay, resolveValue) {
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if (delay <= 0) {
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const promise = Promise.resolve(resolveValue);
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promise.resolve = () => {}; // NOP
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promise.reject = () => {}; // NOP
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return promise;
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}
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let timer = null;
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let {promise, resolve, reject} = deferPromise();
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const complete = (callback, value) => {
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if (callback === null) { return; }
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if (timer !== null) {
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clearTimeout(timer);
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timer = null;
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}
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resolve = null;
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reject = null;
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callback(value);
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};
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const resolveWrapper = (value) => complete(resolve, value);
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const rejectWrapper = (value) => complete(reject, value);
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timer = setTimeout(() => {
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timer = null;
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resolveWrapper(resolveValue);
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}, delay);
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promise.resolve = resolveWrapper;
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promise.reject = rejectWrapper;
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return promise;
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}
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function promiseAnimationFrame(timeout=null) {
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return new Promise((resolve, reject) => {
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if (typeof cancelAnimationFrame !== 'function' || typeof requestAnimationFrame !== 'function') {
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reject(new Error('Animation not supported in this context'));
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return;
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}
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let timer = null;
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let frameRequest = null;
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const onFrame = (time) => {
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frameRequest = null;
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if (timer !== null) {
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clearTimeout(timer);
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timer = null;
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}
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resolve({time, timeout: false});
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};
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const onTimeout = () => {
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timer = null;
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if (frameRequest !== null) {
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// eslint-disable-next-line no-undef
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cancelAnimationFrame(frameRequest);
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frameRequest = null;
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}
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resolve({time: timeout, timeout: true});
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};
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// eslint-disable-next-line no-undef
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frameRequest = requestAnimationFrame(onFrame);
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if (typeof timeout === 'number') {
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timer = setTimeout(onTimeout, timeout);
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}
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});
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}
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/*
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* Common classes
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*/
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class EventDispatcher {
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constructor() {
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this._eventMap = new Map();
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}
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trigger(eventName, details) {
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const callbacks = this._eventMap.get(eventName);
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if (typeof callbacks === 'undefined') { return false; }
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for (const callback of callbacks) {
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callback(details);
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}
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}
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on(eventName, callback) {
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let callbacks = this._eventMap.get(eventName);
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if (typeof callbacks === 'undefined') {
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callbacks = [];
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this._eventMap.set(eventName, callbacks);
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}
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callbacks.push(callback);
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}
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off(eventName, callback) {
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const callbacks = this._eventMap.get(eventName);
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if (typeof callbacks === 'undefined') { return true; }
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const ii = callbacks.length;
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for (let i = 0; i < ii; ++i) {
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if (callbacks[i] === callback) {
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callbacks.splice(i, 1);
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if (callbacks.length === 0) {
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this._eventMap.delete(eventName);
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}
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return true;
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}
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}
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return false;
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}
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hasListeners(eventName) {
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const callbacks = this._eventMap.get(eventName);
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return (typeof callbacks !== 'undefined' && callbacks.length > 0);
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}
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}
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class EventListenerCollection {
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constructor() {
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this._eventListeners = [];
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}
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get size() {
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return this._eventListeners.length;
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}
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addGeneric(type, object, ...args) {
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switch (type) {
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case 'addEventListener': return this.addEventListener(object, ...args);
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case 'addListener': return this.addListener(object, ...args);
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case 'on': return this.on(object, ...args);
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}
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}
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addEventListener(object, ...args) {
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object.addEventListener(...args);
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this._eventListeners.push(['removeEventListener', object, ...args]);
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}
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addListener(object, ...args) {
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object.addListener(...args);
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this._eventListeners.push(['removeListener', object, ...args]);
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}
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on(object, ...args) {
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object.on(...args);
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this._eventListeners.push(['off', object, ...args]);
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}
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removeAllEventListeners() {
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if (this._eventListeners.length === 0) { return; }
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for (const [removeFunctionName, object, ...args] of this._eventListeners) {
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switch (removeFunctionName) {
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case 'removeEventListener':
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object.removeEventListener(...args);
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break;
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case 'removeListener':
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object.removeListener(...args);
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break;
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case 'off':
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object.off(...args);
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break;
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default:
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throw new Error(`Unknown remove function: ${removeFunctionName}`);
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}
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}
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this._eventListeners = [];
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}
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}
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/**
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* Class representing a generic value with an override stack.
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* Changes can be observed by listening to the 'change' event.
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*/
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class DynamicProperty extends EventDispatcher {
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/**
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* Creates a new instance with the specified value.
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* @param value The value to assign.
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*/
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constructor(value) {
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super();
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this._value = value;
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this._defaultValue = value;
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this._overrides = [];
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}
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/**
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* Gets the default value for the property, which is assigned to the
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* public value property when no overrides are present.
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*/
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get defaultValue() {
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return this._defaultValue;
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}
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/**
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* Assigns the default value for the property. If no overrides are present
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* and if the value is different than the current default value,
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* the 'change' event will be triggered.
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* @param value The value to assign.
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*/
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set defaultValue(value) {
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this._defaultValue = value;
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if (this._overrides.length === 0) { this._updateValue(); }
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}
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/**
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* Gets the current value for the property, taking any overrides into account.
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*/
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get value() {
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return this._value;
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}
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/**
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* Gets the number of overrides added to the property.
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*/
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get overrideCount() {
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return this._overrides.length;
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}
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/**
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* Adds an override value with the specified priority to the override stack.
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* Values with higher priority will take precedence over those with lower.
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* For tie breaks, the override value added first will take precedence.
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* If the newly added override has the highest priority of all overrides
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* and if the override value is different from the current value,
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* the 'change' event will be fired.
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* @param value The override value to assign.
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* @param priority The priority value to use, as a number.
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* @returns A string token which can be passed to the clearOverride function
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* to remove the override.
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*/
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setOverride(value, priority=0) {
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const overridesCount = this._overrides.length;
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let i = 0;
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for (; i < overridesCount; ++i) {
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if (priority > this._overrides[i].priority) { break; }
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}
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const token = generateId(16);
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this._overrides.splice(i, 0, {value, priority, token});
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if (i === 0) { this._updateValue(); }
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return token;
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}
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/**
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* Removes a specific override value. If the removed override
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* had the highest priority, and the new value is different from
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* the previous value, the 'change' event will be fired.
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* @param token The token for the corresponding override which is to be removed.
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* @returns true if an override was returned, false otherwise.
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*/
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clearOverride(token) {
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for (let i = 0, ii = this._overrides.length; i < ii; ++i) {
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if (this._overrides[i].token === token) {
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this._overrides.splice(i, 1);
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if (i === 0) { this._updateValue(); }
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return true;
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}
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}
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return false;
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}
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/**
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* Updates the current value using the current overrides and default value.
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* If the new value differs from the previous value, the 'change' event will be fired.
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*/
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_updateValue() {
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const value = this._overrides.length > 0 ? this._overrides[0].value : this._defaultValue;
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if (this._value === value) { return; }
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this._value = value;
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this.trigger('change', {value});
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}
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}
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