chrome-devtools-frontend/front_end/host/Platform.js

Chrome DevTools UI

/*
 * Copyright (C) 2014 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

import {InspectorFrontendHostInstance} from './InspectorFrontendHost.js';

/** @type {string} */
let _platform;

/**
 * @return {string}
 */
export function platform() {
  if (!_platform) {
    _platform = InspectorFrontendHostInstance.platform();
  }
  return _platform;
}

/** @type {boolean} */
let _isMac;

/**
 * @return {boolean}
 */
export function isMac() {
  if (typeof _isMac === 'undefined') {
    _isMac = platform() === 'mac';
  }

  return _isMac;
}

/** @type {boolean} */
let _isWin;

/**
 * @return {boolean}
 */
export function isWin() {
  if (typeof _isWin === 'undefined') {
    _isWin = platform() === 'windows';
  }

  return _isWin;
}

/** @type {boolean} */
let _isCustomDevtoolsFrontend;

/**
 * @return {boolean}
 */
export function isCustomDevtoolsFrontend() {
  if (typeof _isCustomDevtoolsFrontend === 'undefined') {
    _isCustomDevtoolsFrontend = window.location.toString().startsWith('devtools://devtools/custom/');
  }
  return _isCustomDevtoolsFrontend;
}

/** @type {string} */
let _fontFamily;

/**
 * @return {string}
 */
export function fontFamily() {
  if (_fontFamily) {
    return _fontFamily;
  }
  switch (platform()) {
    case 'linux':
      _fontFamily = 'Roboto, Ubuntu, Arial, sans-serif';
      break;
    case 'mac':
      _fontFamily = '\'Lucida Grande\', sans-serif';
      break;
    case 'windows':
      _fontFamily = '\'Segoe UI\', Tahoma, sans-serif';
      break;
  }
  return _fontFamily;
}