1 files changed, 87 insertions, 0 deletions
diff --git a/node_modules/vue/src/platforms/web/runtime/modules/events.js b/node_modules/vue/src/platforms/web/runtime/modules/events.js
new file mode 100644
index 00000000..1e71b667
--- /dev/null
+++ b/node_modules/vue/src/platforms/web/runtime/modules/events.js
@@ -0,0 +1,87 @@
+/* @flow */
+
+import { isDef, isUndef } from 'shared/util'
+import { updateListeners } from 'core/vdom/helpers/index'
+import { withMacroTask, isIE, supportsPassive } from 'core/util/index'
+import { RANGE_TOKEN, CHECKBOX_RADIO_TOKEN } from 'web/compiler/directives/model'
+
+// normalize v-model event tokens that can only be determined at runtime.
+// it's important to place the event as the first in the array because
+// the whole point is ensuring the v-model callback gets called before
+// user-attached handlers.
+function normalizeEvents (on) {
+  /* istanbul ignore if */
+  if (isDef(on[RANGE_TOKEN])) {
+    // IE input[type=range] only supports `change` event
+    const event = isIE ? 'change' : 'input'
+    on[event] = [].concat(on[RANGE_TOKEN], on[event] || [])
+    delete on[RANGE_TOKEN]
+  }
+  // This was originally intended to fix #4521 but no longer necessary
+  // after 2.5. Keeping it for backwards compat with generated code from < 2.4
+  /* istanbul ignore if */
+  if (isDef(on[CHECKBOX_RADIO_TOKEN])) {
+    on.change = [].concat(on[CHECKBOX_RADIO_TOKEN], on.change || [])
+    delete on[CHECKBOX_RADIO_TOKEN]
+  }
+}
+
+let target: any
+
+function createOnceHandler (handler, event, capture) {
+  const _target = target // save current target element in closure
+  return function onceHandler () {
+    const res = handler.apply(null, arguments)
+    if (res !== null) {
+      remove(event, onceHandler, capture, _target)
+    }
+  }
+}
+
+function add (
+  event: string,
+  handler: Function,
+  once: boolean,
+  capture: boolean,
+  passive: boolean
+) {
+  handler = withMacroTask(handler)
+  if (once) handler = createOnceHandler(handler, event, capture)
+  target.addEventListener(
+    event,
+    handler,
+    supportsPassive
+      ? { capture, passive }
+      : capture
+  )
+}
+
+function remove (
+  event: string,
+  handler: Function,
+  capture: boolean,
+  _target?: HTMLElement
+) {
+  (_target || target).removeEventListener(
+    event,
+    handler._withTask || handler,
+    capture
+  )
+}
+
+function updateDOMListeners (oldVnode: VNodeWithData, vnode: VNodeWithData) {
+  if (isUndef(oldVnode.data.on) && isUndef(vnode.data.on)) {
+    return
+  }
+  const on = vnode.data.on || {}
+  const oldOn = oldVnode.data.on || {}
+  target = vnode.elm
+  normalizeEvents(on)
+  updateListeners(on, oldOn, add, remove, vnode.context)
+  target = undefined
+}
+
+export default {
+  create: updateDOMListeners,
+  update: updateDOMListeners
+}