/* * Copyright (C) 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 <http://www.gnu.org/licenses/>. */ /** * Utility class to help display hotkeys and convert to/from commands. */ class HotkeyUtil { /** * Creates a new instance. */ constructor(os=null) { this._os = os; this._inputSeparator = ' + '; this._modifierKeyNames = new Map(); this._mouseInputNamePattern = /^mouse(\d+)$/; this._modifierPriorities = new Map([ ['meta', -4], ['ctrl', -3], ['alt', -2], ['shift', -1] ]); this._stringComparer = new Intl.Collator('en-US'); // Invariant locale this._updateModifierKeyNames(); } /** * Gets the operating system for this instance. * The operating system is used to display system-localized modifier key names. */ get os() { return this._os; } /** * Sets the operating system for this instance. * @param value The value to assign. * Valid values are: win, mac, linux, openbsd, cros, android. */ set os(value) { if (this._os === value) { return; } this._os = value; this._updateModifierKeyNames(); } /** * Gets a display string for a key and a set of modifiers. * @param key The key code string, or `null` for no key. * @param modifiers An array of modifiers. * Valid values are: ctrl, alt, shift, meta, or mouseN, where N is an integer. * @returns A user-friendly string for the combination of key and modifiers. */ getInputDisplayValue(key, modifiers) { const separator = this._inputSeparator; let displayValue = ''; let first = true; for (const modifier of modifiers) { if (first) { first = false; } else { displayValue += separator; } displayValue += this.getModifierDisplayValue(modifier); } if (typeof key === 'string') { if (!first) { displayValue += separator; } displayValue += this.getKeyDisplayValue(key); } return displayValue; } /** * Gets a display string for a single modifier. * @param modifier A string representing a modifier. * Valid values are: ctrl, alt, shift, meta, or mouseN, where N is an integer. * @returns A user-friendly string for the modifier. */ getModifierDisplayValue(modifier) { const match = this._mouseInputNamePattern.exec(modifier); if (match !== null) { return `Mouse ${match[1]}`; } const name = this._modifierKeyNames.get(modifier); return (typeof name !== 'undefined' ? name : modifier); } /** * Gets a display string for a key. * @param key The key code string, or `null` for no key. * @returns A user-friendly string for the combination of key and modifiers, or `null` if key was already `null`. */ getKeyDisplayValue(key) { if (typeof key === 'string' && key.length === 4 && key.startsWith('Key')) { key = key.substring(3); } return key; } /** * Gets a display string for a single modifier. * @param modifier A string representing a modifier. * Valid values are: ctrl, alt, shift, meta, or mouseN, where N is an integer. * @returns `'mouse'` if the modifier represents a mouse button, `'key'` otherwise. */ getModifierType(modifier) { return (this._mouseInputNamePattern.test(modifier) ? 'mouse' : 'key'); } /** * Converts an extension command string into a standard input. * @param command An extension command string. * @returns An object `{key, modifiers}`, where key is a string (or `null`) representing the key, and modifiers is an array of modifier keys. */ convertCommandToInput(command) { let key = null; const modifiers = new Set(); if (typeof command === 'string' && command.length > 0) { const parts = command.split('+'); const ii = parts.length - 1; key = this._convertCommandKeyToInputKey(parts[ii]); for (let i = 0; i < ii; ++i) { modifiers.add(this._convertCommandModifierToInputModifier(parts[i])); } } return {key, modifiers: this.sortModifiers([...modifiers])}; } /** * Gets a command string for a specified input. * @param key The key code string, or `null` for no key. * @param modifiers An array of modifier keys. * Valid values are: ctrl, alt, shift, meta. * @returns An extension command string representing the input. */ convertInputToCommand(key, modifiers) { const separator = '+'; let command = ''; let first = true; for (const modifier of modifiers) { if (first) { first = false; } else { command += separator; } command += this._convertInputModifierToCommandModifier(modifier); } if (typeof key === 'string') { if (!first) { command += separator; } command += this._convertInputKeyToCommandKey(key); } return command; } /** * Sorts an array of modifiers. * @param modifiers An array of modifiers. * Valid values are: ctrl, alt, shift, meta. * @returns A sorted array of modifiers. The array instance is the same as the input array. */ sortModifiers(modifiers) { const pattern = this._mouseInputNamePattern; const keyPriorities = this._modifierPriorities; const stringComparer = this._stringComparer; const count = modifiers.length; const modifierInfos = []; for (let i = 0; i < count; ++i) { const modifier = modifiers[i]; const match = pattern.exec(modifier); let info; if (match !== null) { info = [modifier, 1, Number.parseInt(match[1], 10), i]; } else { let priority = keyPriorities.get(modifier); if (typeof priority === 'undefined') { priority = 0; } info = [modifier, 0, priority, i]; } modifierInfos.push(info); } modifierInfos.sort((a, b) => { let i = a[1] - b[1]; if (i !== 0) { return i; } i = a[2] - b[2]; if (i !== 0) { return i; } i = stringComparer.compare(a[0], b[0]); if (i !== 0) { return i; } i = a[3] - b[3]; return i; }); for (let i = 0; i < count; ++i) { modifiers[i] = modifierInfos[i][0]; } return modifiers; } // Private _getModifierKeyNames(os) { switch (os) { case 'win': return [ ['alt', 'Alt'], ['ctrl', 'Ctrl'], ['shift', 'Shift'], ['meta', 'Windows'] ]; case 'mac': return [ ['alt', 'Opt'], ['ctrl', 'Ctrl'], ['shift', 'Shift'], ['meta', 'Cmd'] ]; case 'linux': case 'openbsd': case 'cros': case 'android': return [ ['alt', 'Alt'], ['ctrl', 'Ctrl'], ['shift', 'Shift'], ['meta', 'Super'] ]; default: // 'unknown', etc return [ ['alt', 'Alt'], ['ctrl', 'Ctrl'], ['shift', 'Shift'], ['meta', 'Meta'] ]; } } _updateModifierKeyNames() { const map = this._modifierKeyNames; map.clear(); for (const [key, value] of this._getModifierKeyNames(this._os)) { map.set(key, value); } } _convertCommandKeyToInputKey(key) { if (key.length === 1) { key = `Key${key}`; } return key; } _convertCommandModifierToInputModifier(modifier) { switch (modifier) { case 'Ctrl': return (this._os === 'mac' ? 'meta' : 'ctrl'); case 'Alt': return 'alt'; case 'Shift': return 'shift'; case 'MacCtrl': return 'ctrl'; case 'Command': return 'meta'; default: return modifier; } } _convertInputKeyToCommandKey(key) { if (key.length === 4 && key.startsWith('Key')) { key = key.substring(3); } return key; } _convertInputModifierToCommandModifier(modifier) { switch (modifier) { case 'ctrl': return (this._os === 'mac' ? 'MacCtrl' : 'Ctrl'); case 'alt': return 'Alt'; case 'shift': return 'Shift'; case 'meta': return 'Command'; default: return modifier; } } }