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diff --git a/ext/mixed/js/object-property-accessor.js b/ext/mixed/js/object-property-accessor.js
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-/*
- * Copyright (C) 2016-2021 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/>.
- */
-
-/**
- * Class used to get and mutate generic properties of an object by using path strings.
- */
-class ObjectPropertyAccessor {
- /**
- * Create a new accessor for a specific object.
- * @param target The object which the getter and mutation methods are applied to.
- * @returns A new ObjectPropertyAccessor instance.
- */
- constructor(target) {
- this._target = target;
- }
-
- /**
- * Gets the value at the specified path.
- * @param pathArray The path to the property on the target object.
- * @param pathLength How many parts of the pathArray to use.
- * This parameter is optional and defaults to the length of pathArray.
- * @returns The value found at the path.
- * @throws An error is thrown if pathArray is not valid for the target object.
- */
- get(pathArray, pathLength) {
- let target = this._target;
- const ii = typeof pathLength === 'number' ? Math.min(pathArray.length, pathLength) : pathArray.length;
- for (let i = 0; i < ii; ++i) {
- const key = pathArray[i];
- if (!ObjectPropertyAccessor.hasProperty(target, key)) {
- throw new Error(`Invalid path: ${ObjectPropertyAccessor.getPathString(pathArray.slice(0, i + 1))}`);
- }
- target = target[key];
- }
- return target;
- }
-
- /**
- * Sets the value at the specified path.
- * @param pathArray The path to the property on the target object.
- * @param value The value to assign to the property.
- * @throws An error is thrown if pathArray is not valid for the target object.
- */
- set(pathArray, value) {
- const ii = pathArray.length - 1;
- if (ii < 0) { throw new Error('Invalid path'); }
-
- const target = this.get(pathArray, ii);
- const key = pathArray[ii];
- if (!ObjectPropertyAccessor.isValidPropertyType(target, key)) {
- throw new Error(`Invalid path: ${ObjectPropertyAccessor.getPathString(pathArray)}`);
- }
-
- target[key] = value;
- }
-
- /**
- * Deletes the property of the target object at the specified path.
- * @param pathArray The path to the property on the target object.
- * @throws An error is thrown if pathArray is not valid for the target object.
- */
- delete(pathArray) {
- const ii = pathArray.length - 1;
- if (ii < 0) { throw new Error('Invalid path'); }
-
- const target = this.get(pathArray, ii);
- const key = pathArray[ii];
- if (!ObjectPropertyAccessor.isValidPropertyType(target, key)) {
- throw new Error(`Invalid path: ${ObjectPropertyAccessor.getPathString(pathArray)}`);
- }
-
- if (Array.isArray(target)) {
- throw new Error('Invalid type');
- }
-
- delete target[key];
- }
-
- /**
- * Swaps two properties of an object or array.
- * @param pathArray1 The path to the first property on the target object.
- * @param pathArray2 The path to the second property on the target object.
- * @throws An error is thrown if pathArray1 or pathArray2 is not valid for the target object,
- * or if the swap cannot be performed.
- */
- swap(pathArray1, pathArray2) {
- const ii1 = pathArray1.length - 1;
- if (ii1 < 0) { throw new Error('Invalid path 1'); }
- const target1 = this.get(pathArray1, ii1);
- const key1 = pathArray1[ii1];
- if (!ObjectPropertyAccessor.isValidPropertyType(target1, key1)) { throw new Error(`Invalid path 1: ${ObjectPropertyAccessor.getPathString(pathArray1)}`); }
-
- const ii2 = pathArray2.length - 1;
- if (ii2 < 0) { throw new Error('Invalid path 2'); }
- const target2 = this.get(pathArray2, ii2);
- const key2 = pathArray2[ii2];
- if (!ObjectPropertyAccessor.isValidPropertyType(target2, key2)) { throw new Error(`Invalid path 2: ${ObjectPropertyAccessor.getPathString(pathArray2)}`); }
-
- const value1 = target1[key1];
- const value2 = target2[key2];
-
- target1[key1] = value2;
- try {
- target2[key2] = value1;
- } catch (e) {
- // Revert
- try {
- target1[key1] = value1;
- } catch (e2) {
- // NOP
- }
- throw e;
- }
- }
-
- /**
- * Converts a path string to a path array.
- * @param pathArray The path array to convert.
- * @returns A string representation of pathArray.
- */
- static getPathString(pathArray) {
- const regexShort = /^[a-zA-Z_][a-zA-Z0-9_]*$/;
- let pathString = '';
- let first = true;
- for (let part of pathArray) {
- switch (typeof part) {
- case 'number':
- if (Math.floor(part) !== part || part < 0) {
- throw new Error('Invalid index');
- }
- part = `[${part}]`;
- break;
- case 'string':
- if (!regexShort.test(part)) {
- const escapedPart = part.replace(/["\\]/g, '\\$&');
- part = `["${escapedPart}"]`;
- } else {
- if (!first) {
- part = `.${part}`;
- }
- }
- break;
- default:
- throw new Error(`Invalid type: ${typeof part}`);
- }
- pathString += part;
- first = false;
- }
- return pathString;
- }
-
- /**
- * Converts a path array to a path string. For the most part, the format of this string
- * matches Javascript's notation for property access.
- * @param pathString The path string to convert.
- * @returns An array representation of pathString.
- */
- static getPathArray(pathString) {
- const pathArray = [];
- let state = 'empty';
- let quote = 0;
- let value = '';
- let escaped = false;
- for (const c of pathString) {
- const v = c.codePointAt(0);
- switch (state) {
- case 'empty': // Empty
- case 'id-start': // Expecting identifier start
- if (v === 0x5b) { // '['
- if (state === 'id-start') {
- throw new Error(`Unexpected character: ${c}`);
- }
- state = 'open-bracket';
- } else if (
- (v >= 0x41 && v <= 0x5a) || // ['A', 'Z']
- (v >= 0x61 && v <= 0x7a) || // ['a', 'z']
- v === 0x5f // '_'
- ) {
- state = 'id';
- value += c;
- } else {
- throw new Error(`Unexpected character: ${c}`);
- }
- break;
- case 'id': // Identifier
- if (
- (v >= 0x41 && v <= 0x5a) || // ['A', 'Z']
- (v >= 0x61 && v <= 0x7a) || // ['a', 'z']
- (v >= 0x30 && v <= 0x39) || // ['0', '9']
- v === 0x5f // '_'
- ) {
- value += c;
- } else if (v === 0x5b) { // '['
- pathArray.push(value);
- value = '';
- state = 'open-bracket';
- } else if (v === 0x2e) { // '.'
- pathArray.push(value);
- value = '';
- state = 'id-start';
- } else {
- throw new Error(`Unexpected character: ${c}`);
- }
- break;
- case 'open-bracket': // Open bracket
- if (v === 0x22 || v === 0x27) { // '"' or '\''
- quote = v;
- state = 'string';
- } else if (v >= 0x30 && v <= 0x39) { // ['0', '9']
- state = 'number';
- value += c;
- } else {
- throw new Error(`Unexpected character: ${c}`);
- }
- break;
- case 'string': // Quoted string
- if (escaped) {
- value += c;
- escaped = false;
- } else if (v === 0x5c) { // '\\'
- escaped = true;
- } else if (v !== quote) {
- value += c;
- } else {
- state = 'close-bracket';
- }
- break;
- case 'number': // Number
- if (v >= 0x30 && v <= 0x39) { // ['0', '9']
- value += c;
- } else if (v === 0x5d) { // ']'
- pathArray.push(Number.parseInt(value, 10));
- value = '';
- state = 'next';
- } else {
- throw new Error(`Unexpected character: ${c}`);
- }
- break;
- case 'close-bracket': // Expecting closing bracket after quoted string
- if (v === 0x5d) { // ']'
- pathArray.push(value);
- value = '';
- state = 'next';
- } else {
- throw new Error(`Unexpected character: ${c}`);
- }
- break;
- case 'next': // Expecting . or [
- if (v === 0x5b) { // '['
- state = 'open-bracket';
- } else if (v === 0x2e) { // '.'
- state = 'id-start';
- } else {
- throw new Error(`Unexpected character: ${c}`);
- }
- break;
- }
- }
- switch (state) {
- case 'empty':
- case 'next':
- break;
- case 'id':
- pathArray.push(value);
- value = '';
- break;
- default:
- throw new Error('Path not terminated correctly');
- }
- return pathArray;
- }
-
- /**
- * Checks whether an object or array has the specified property.
- * @param object The object to test.
- * @param property The property to check for existence.
- * This value should be a string if the object is a non-array object.
- * For arrays, it should be an integer.
- * @returns true if the property exists, otherwise false.
- */
- static hasProperty(object, property) {
- switch (typeof property) {
- case 'string':
- return (
- typeof object === 'object' &&
- object !== null &&
- !Array.isArray(object) &&
- Object.prototype.hasOwnProperty.call(object, property)
- );
- case 'number':
- return (
- Array.isArray(object) &&
- property >= 0 &&
- property < object.length &&
- property === Math.floor(property)
- );
- default:
- return false;
- }
- }
-
- /**
- * Checks whether a property is valid for the given object
- * @param object The object to test.
- * @param property The property to check for existence.
- * @returns true if the property is correct for the given object type, otherwise false.
- * For arrays, this means that the property should be a positive integer.
- * For non-array objects, the property should be a string.
- */
- static isValidPropertyType(object, property) {
- switch (typeof property) {
- case 'string':
- return (
- typeof object === 'object' &&
- object !== null &&
- !Array.isArray(object)
- );
- case 'number':
- return (
- Array.isArray(object) &&
- property >= 0 &&
- property === Math.floor(property)
- );
- default:
- return false;
- }
- }
-}