146 lines
3.7 KiB
JavaScript
Executable File
146 lines
3.7 KiB
JavaScript
Executable File
/**
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* @license
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* Copyright The Closure Library Authors.
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @fileoverview Closure user agent detection.
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* @see http://en.wikipedia.org/wiki/User_agent
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* For more information on browser brand, platform, or device see the other
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* sub-namespaces in goog.labs.userAgent (browser, platform, and device).
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*/
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goog.module('goog.labs.userAgent.engine');
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goog.module.declareLegacyNamespace();
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const googArray = goog.require('goog.array');
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const googString = goog.require('goog.string.internal');
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const util = goog.require('goog.labs.userAgent.util');
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/**
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* @return {boolean} Whether the rendering engine is Presto.
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*/
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function isPresto() {
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return util.matchUserAgent('Presto');
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}
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/**
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* @return {boolean} Whether the rendering engine is Trident.
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*/
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function isTrident() {
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// IE only started including the Trident token in IE8.
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return util.matchUserAgent('Trident') || util.matchUserAgent('MSIE');
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}
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/**
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* @return {boolean} Whether the rendering engine is EdgeHTML.
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*/
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function isEdge() {
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return util.matchUserAgent('Edge');
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}
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/**
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* @return {boolean} Whether the rendering engine is WebKit. This will return
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* true for Chrome, Blink-based Opera (15+), Edge Chromium and Safari.
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*/
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function isWebKit() {
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return util.matchUserAgentIgnoreCase('WebKit') && !isEdge();
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}
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/**
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* @return {boolean} Whether the rendering engine is Gecko.
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*/
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function isGecko() {
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return util.matchUserAgent('Gecko') && !isWebKit() && !isTrident() &&
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!isEdge();
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}
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/**
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* @return {string} The rendering engine's version or empty string if version
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* can't be determined.
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*/
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function getVersion() {
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const userAgentString = util.getUserAgent();
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if (userAgentString) {
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const tuples = util.extractVersionTuples(userAgentString);
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const engineTuple = getEngineTuple(tuples);
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if (engineTuple) {
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// In Gecko, the version string is either in the browser info or the
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// Firefox version. See Gecko user agent string reference:
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// http://goo.gl/mULqa
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if (engineTuple[0] == 'Gecko') {
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return getVersionForKey(tuples, 'Firefox');
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}
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return engineTuple[1];
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}
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// MSIE has only one version identifier, and the Trident version is
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// specified in the parenthetical. IE Edge is covered in the engine tuple
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// detection.
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const browserTuple = tuples[0];
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let info;
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if (browserTuple && (info = browserTuple[2])) {
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const match = /Trident\/([^\s;]+)/.exec(info);
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if (match) {
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return match[1];
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}
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}
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}
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return '';
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}
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/**
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* @param {!Array<!Array<string>>} tuples Extracted version tuples.
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* @return {!Array<string>|undefined} The engine tuple or undefined if not
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* found.
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*/
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function getEngineTuple(tuples) {
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if (!isEdge()) {
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return tuples[1];
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}
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for (let i = 0; i < tuples.length; i++) {
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const tuple = tuples[i];
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if (tuple[0] == 'Edge') {
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return tuple;
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}
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}
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}
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/**
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* @param {string|number} version The version to check.
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* @return {boolean} Whether the rendering engine version is higher or the same
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* as the given version.
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*/
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function isVersionOrHigher(version) {
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return googString.compareVersions(getVersion(), version) >= 0;
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}
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/**
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* @param {!Array<!Array<string>>} tuples Version tuples.
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* @param {string} key The key to look for.
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* @return {string} The version string of the given key, if present.
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* Otherwise, the empty string.
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*/
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function getVersionForKey(tuples, key) {
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// TODO(nnaze): Move to util if useful elsewhere.
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const pair = googArray.find(tuples, function(pair) {
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return key == pair[0];
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});
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return pair && pair[1] || '';
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}
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exports = {
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getVersion,
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isEdge,
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isGecko,
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isPresto,
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isTrident,
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isVersionOrHigher,
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isWebKit,
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};
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