Refine browser detection

Try to follow the principle outlined by Mozilla when detecting browsers
and engines.

core/util/browser.js

@@ -77,6 +77,8 @@ export const hasScrollbarGutter = _hasScrollbarGutter;
  * It's better to use feature detection than platform detection.
  */
 
+/* OS */
+
 export function isMac() {
     return !!(/mac/i).exec(navigator.platform);
 }
@@ -91,12 +93,50 @@ export function isIOS() {
             !!(/ipod/i).exec(navigator.platform));
 }
 
+/* Browser */
+
 export function isSafari() {
-    return (navigator.userAgent.indexOf('Safari') !== -1 &&
+    return !!navigator.userAgent.match('Safari/...') &&
-            navigator.userAgent.indexOf('Chrome') === -1);
+           !navigator.userAgent.match('Chrome/...') &&
+           !navigator.userAgent.match('Chromium/...') &&
+           !navigator.userAgent.match('Epiphany/...');
 }
 
 export function isFirefox() {
-    return !!(/firefox/i).exec(navigator.userAgent);
+    return !!navigator.userAgent.match('Firefox/...') &&
+           !navigator.userAgent.match('Seamonkey/...');
 }
 
+export function isChrome() {
+    return !!navigator.userAgent.match('Chrome/...') &&
+           !navigator.userAgent.match('Chromium/...') &&
+           !navigator.userAgent.match('Edg/...') &&
+           !navigator.userAgent.match('OPR/...');
+}
+
+export function isChromium() {
+    return !!navigator.userAgent.match('Chromium/...');
+}
+
+export function isOpera() {
+    return !!navigator.userAgent.match('OPR/...');
+}
+
+export function isEdge() {
+    return !!navigator.userAgent.match('Edg/...');
+}
+
+/* Engine */
+
+export function isGecko() {
+    return !!navigator.userAgent.match('Gecko/...');
+}
+
+export function isWebKit() {
+    return !!navigator.userAgent.match('AppleWebKit/...') &&
+           !navigator.userAgent.match('Chrome/...');
+}
+
+export function isBlink() {
+    return !!navigator.userAgent.match('Chrome/...');
+}

tests/test.browser.js

@@ -1,7 +1,8 @@
 /* eslint-disable no-console */
 const expect = chai.expect;
 
-import { isSafari, isFirefox } from '../core/util/browser.js';
+import { isSafari, isFirefox, isChrome, isChromium, isOpera, isEdge,
+         isGecko, isWebKit, isBlink } from '../core/util/browser.js';
 
 describe('Browser detection', function () {
     let origNavigator;
@@ -23,6 +24,14 @@ describe('Browser detection', function () {
 
         expect(isSafari()).to.be.false;
         expect(isFirefox()).to.be.false;
+        expect(isChrome()).to.be.true;
+        expect(isChromium()).to.be.false;
+        expect(isOpera()).to.be.false;
+        expect(isEdge()).to.be.false;
+
+        expect(isGecko()).to.be.false;
+        expect(isWebKit()).to.be.false;
+        expect(isBlink()).to.be.true;
     });
 
     it('should handle Chromium', function () {
@@ -30,6 +39,14 @@ describe('Browser detection', function () {
 
         expect(isSafari()).to.be.false;
         expect(isFirefox()).to.be.false;
+        expect(isChrome()).to.be.false;
+        expect(isChromium()).to.be.true;
+        expect(isOpera()).to.be.false;
+        expect(isEdge()).to.be.false;
+
+        expect(isGecko()).to.be.false;
+        expect(isWebKit()).to.be.false;
+        expect(isBlink()).to.be.true;
     });
 
     it('should handle Firefox', function () {
@@ -37,6 +54,44 @@ describe('Browser detection', function () {
 
         expect(isSafari()).to.be.false;
         expect(isFirefox()).to.be.true;
+        expect(isChrome()).to.be.false;
+        expect(isChromium()).to.be.false;
+        expect(isOpera()).to.be.false;
+        expect(isEdge()).to.be.false;
+
+        expect(isGecko()).to.be.true;
+        expect(isWebKit()).to.be.false;
+        expect(isBlink()).to.be.false;
+    });
+
+    it('should handle Seamonkey', function () {
+        navigator.userAgent = "Mozilla/5.0 (Windows NT 6.1; rv:36.0) Gecko/20100101 Firefox/36.0 Seamonkey/2.33.1";
+
+        expect(isSafari()).to.be.false;
+        expect(isFirefox()).to.be.false;
+        expect(isChrome()).to.be.false;
+        expect(isChromium()).to.be.false;
+        expect(isOpera()).to.be.false;
+        expect(isEdge()).to.be.false;
+
+        expect(isGecko()).to.be.true;
+        expect(isWebKit()).to.be.false;
+        expect(isBlink()).to.be.false;
+    });
+
+    it('should handle Safari', function () {
+        navigator.userAgent = "Mozilla/5.0 (Macintosh; Intel Mac OS X 12_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.6 Safari/605.1.15";
+
+        expect(isSafari()).to.be.true;
+        expect(isFirefox()).to.be.false;
+        expect(isChrome()).to.be.false;
+        expect(isChromium()).to.be.false;
+        expect(isOpera()).to.be.false;
+        expect(isEdge()).to.be.false;
+
+        expect(isGecko()).to.be.false;
+        expect(isWebKit()).to.be.true;
+        expect(isBlink()).to.be.false;
     });
 
     it('should handle Edge', function () {
@@ -44,6 +99,14 @@ describe('Browser detection', function () {
 
         expect(isSafari()).to.be.false;
         expect(isFirefox()).to.be.false;
+        expect(isChrome()).to.be.false;
+        expect(isChromium()).to.be.false;
+        expect(isOpera()).to.be.false;
+        expect(isEdge()).to.be.true;
+
+        expect(isGecko()).to.be.false;
+        expect(isWebKit()).to.be.false;
+        expect(isBlink()).to.be.true;
     });
 
     it('should handle Opera', function () {
@@ -51,5 +114,28 @@ describe('Browser detection', function () {
 
         expect(isSafari()).to.be.false;
         expect(isFirefox()).to.be.false;
+        expect(isChrome()).to.be.false;
+        expect(isChromium()).to.be.false;
+        expect(isOpera()).to.be.true;
+        expect(isEdge()).to.be.false;
+
+        expect(isGecko()).to.be.false;
+        expect(isWebKit()).to.be.false;
+        expect(isBlink()).to.be.true;
+    });
+
+    it('should handle Epiphany', function () {
+        navigator.userAgent = "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/11.0 Safari/605.1.15 Epiphany/605.1.15";
+
+        expect(isSafari()).to.be.false;
+        expect(isFirefox()).to.be.false;
+        expect(isChrome()).to.be.false;
+        expect(isChromium()).to.be.false;
+        expect(isOpera()).to.be.false;
+        expect(isEdge()).to.be.false;
+
+        expect(isGecko()).to.be.false;
+        expect(isWebKit()).to.be.true;
+        expect(isBlink()).to.be.false;
     });
 });