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/*
* Copyright (C) 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/>.
*/
class Environment {
constructor() {
this._cachedEnvironmentInfo = null;
}
async prepare() {
this._cachedEnvironmentInfo = await this._loadEnvironmentInfo();
}
getInfo() {
if (this._cachedEnvironmentInfo === null) { throw new Error('Not prepared'); }
return this._cachedEnvironmentInfo;
}
async _loadEnvironmentInfo() {
const browser = await this._getBrowser();
const platform = await new Promise((resolve) => chrome.runtime.getPlatformInfo(resolve));
const modifierInfo = this._getModifierInfo(browser, platform.os);
return {
browser,
platform: {
os: platform.os
},
modifiers: modifierInfo
};
}
async _getBrowser() {
if (EXTENSION_IS_BROWSER_EDGE) {
return 'edge';
}
if (typeof browser !== 'undefined') {
try {
const info = await browser.runtime.getBrowserInfo();
if (info.name === 'Fennec') {
return 'firefox-mobile';
}
} catch (e) {
// NOP
}
return 'firefox';
} else {
return 'chrome';
}
}
_getModifierInfo(browser, os) {
let osKeys;
let separator;
switch (os) {
case 'win':
separator = ' + ';
osKeys = [
['alt', 'Alt'],
['ctrl', 'Ctrl'],
['shift', 'Shift'],
['meta', 'Windows']
];
break;
case 'mac':
separator = '';
osKeys = [
['alt', '⌥'],
['ctrl', '⌃'],
['shift', '⇧'],
['meta', '⌘']
];
break;
case 'linux':
case 'openbsd':
case 'cros':
case 'android':
separator = ' + ';
osKeys = [
['alt', 'Alt'],
['ctrl', 'Ctrl'],
['shift', 'Shift'],
['meta', 'Super']
];
break;
default:
throw new Error(`Invalid OS: ${os}`);
}
const isFirefox = (browser === 'firefox' || browser === 'firefox-mobile');
const keys = [];
for (const [value, name] of osKeys) {
// Firefox doesn't support event.metaKey on platforms other than macOS
if (value === 'meta' && isFirefox && os !== 'mac') { continue; }
keys.push({value, name});
}
return {keys, separator};
}
}
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