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/* @flow */
import { extend } from 'shared/util'
function updateAttrs (oldVnode: VNodeWithData, vnode: VNodeWithData) {
if (!oldVnode.data.attrs && !vnode.data.attrs) {
return
}
let key, cur, old
const elm = vnode.elm
const oldAttrs = oldVnode.data.attrs || {}
let attrs = vnode.data.attrs || {}
// clone observed objects, as the user probably wants to mutate it
if (attrs.__ob__) {
attrs = vnode.data.attrs = extend({}, attrs)
}
const supportBatchUpdate = typeof elm.setAttrs === 'function'
const batchedAttrs = {}
for (key in attrs) {
cur = attrs[key]
old = oldAttrs[key]
if (old !== cur) {
supportBatchUpdate
? (batchedAttrs[key] = cur)
: elm.setAttr(key, cur)
}
}
for (key in oldAttrs) {
if (attrs[key] == null) {
supportBatchUpdate
? (batchedAttrs[key] = undefined)
: elm.setAttr(key)
}
}
if (supportBatchUpdate) {
elm.setAttrs(batchedAttrs)
}
}
export default {
create: updateAttrs,
update: updateAttrs
}