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node_modules/vue-router/src/util/push-state.js

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+/* @flow */
+
+import { inBrowser } from './dom'
+import { saveScrollPosition } from './scroll'
+import { genStateKey, setStateKey, getStateKey } from './state-key'
+import { extend } from './misc'
+
+export const supportsPushState =
+  inBrowser &&
+  (function () {
+    const ua = window.navigator.userAgent
+
+    if (
+      (ua.indexOf('Android 2.') !== -1 || ua.indexOf('Android 4.0') !== -1) &&
+      ua.indexOf('Mobile Safari') !== -1 &&
+      ua.indexOf('Chrome') === -1 &&
+      ua.indexOf('Windows Phone') === -1
+    ) {
+      return false
+    }
+
+    return window.history && typeof window.history.pushState === 'function'
+  })()
+
+export function pushState (url?: string, replace?: boolean) {
+  saveScrollPosition()
+  // try...catch the pushState call to get around Safari
+  // DOM Exception 18 where it limits to 100 pushState calls
+  const history = window.history
+  try {
+    if (replace) {
+      // preserve existing history state as it could be overriden by the user
+      const stateCopy = extend({}, history.state)
+      stateCopy.key = getStateKey()
+      history.replaceState(stateCopy, '', url)
+    } else {
+      history.pushState({ key: setStateKey(genStateKey()) }, '', url)
+    }
+  } catch (e) {
+    window.location[replace ? 'replace' : 'assign'](url)
+  }
+}
+
+export function replaceState (url?: string) {
+  pushState(url, true)
+}