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