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node_modules/vue-router/src/history/html5.js

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+/* @flow */
+
+import type Router from '../index'
+import { History } from './base'
+import { cleanPath } from '../util/path'
+import { START } from '../util/route'
+import { setupScroll, handleScroll } from '../util/scroll'
+import { pushState, replaceState, supportsPushState } from '../util/push-state'
+
+export class HTML5History extends History {
+  _startLocation: string
+
+  constructor (router: Router, base: ?string) {
+    super(router, base)
+
+    this._startLocation = getLocation(this.base)
+  }
+
+  setupListeners () {
+    if (this.listeners.length > 0) {
+      return
+    }
+
+    const router = this.router
+    const expectScroll = router.options.scrollBehavior
+    const supportsScroll = supportsPushState && expectScroll
+
+    if (supportsScroll) {
+      this.listeners.push(setupScroll())
+    }
+
+    const handleRoutingEvent = () => {
+      const current = this.current
+
+      // Avoiding first `popstate` event dispatched in some browsers but first
+      // history route not updated since async guard at the same time.
+      const location = getLocation(this.base)
+      if (this.current === START && location === this._startLocation) {
+        return
+      }
+
+      this.transitionTo(location, route => {
+        if (supportsScroll) {
+          handleScroll(router, route, current, true)
+        }
+      })
+    }
+    window.addEventListener('popstate', handleRoutingEvent)
+    this.listeners.push(() => {
+      window.removeEventListener('popstate', handleRoutingEvent)
+    })
+  }
+
+  go (n: number) {
+    window.history.go(n)
+  }
+
+  push (location: RawLocation, onComplete?: Function, onAbort?: Function) {
+    const { current: fromRoute } = this
+    this.transitionTo(location, route => {
+      pushState(cleanPath(this.base + route.fullPath))
+      handleScroll(this.router, route, fromRoute, false)
+      onComplete && onComplete(route)
+    }, onAbort)
+  }
+
+  replace (location: RawLocation, onComplete?: Function, onAbort?: Function) {
+    const { current: fromRoute } = this
+    this.transitionTo(location, route => {
+      replaceState(cleanPath(this.base + route.fullPath))
+      handleScroll(this.router, route, fromRoute, false)
+      onComplete && onComplete(route)
+    }, onAbort)
+  }
+
+  ensureURL (push?: boolean) {
+    if (getLocation(this.base) !== this.current.fullPath) {
+      const current = cleanPath(this.base + this.current.fullPath)
+      push ? pushState(current) : replaceState(current)
+    }
+  }
+
+  getCurrentLocation (): string {
+    return getLocation(this.base)
+  }
+}
+
+export function getLocation (base: string): string {
+  let path = window.location.pathname
+  const pathLowerCase = path.toLowerCase()
+  const baseLowerCase = base.toLowerCase()
+  // base="/a" shouldn't turn path="/app" into "/a/pp"
+  // https://github.com/vuejs/vue-router/issues/3555
+  // so we ensure the trailing slash in the base
+  if (base && ((pathLowerCase === baseLowerCase) ||
+    (pathLowerCase.indexOf(cleanPath(baseLowerCase + '/')) === 0))) {
+    path = path.slice(base.length)
+  }
+  return (path || '/') + window.location.search + window.location.hash
+}