/* @flow */
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import { extend, cached, camelize } from 'shared/util'
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const normalize = cached(camelize)
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function createStyle (oldVnode: VNodeWithData, vnode: VNodeWithData) {
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if (!vnode.data.staticStyle) {
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updateStyle(oldVnode, vnode)
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return
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}
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const elm = vnode.elm
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const staticStyle = vnode.data.staticStyle
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const supportBatchUpdate = typeof elm.setStyles === 'function'
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const batchedStyles = {}
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for (const name in staticStyle) {
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if (staticStyle[name]) {
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supportBatchUpdate
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? (batchedStyles[normalize(name)] = staticStyle[name])
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: elm.setStyle(normalize(name), staticStyle[name])
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}
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}
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if (supportBatchUpdate) {
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elm.setStyles(batchedStyles)
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}
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updateStyle(oldVnode, vnode)
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}
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function updateStyle (oldVnode: VNodeWithData, vnode: VNodeWithData) {
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if (!oldVnode.data.style && !vnode.data.style) {
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return
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}
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let cur, name
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const elm = vnode.elm
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const oldStyle: any = oldVnode.data.style || {}
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let style: any = vnode.data.style || {}
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const needClone = style.__ob__
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// handle array syntax
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if (Array.isArray(style)) {
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style = vnode.data.style = toObject(style)
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}
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// clone the style for future updates,
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// in case the user mutates the style object in-place.
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if (needClone) {
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style = vnode.data.style = extend({}, style)
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}
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const supportBatchUpdate = typeof elm.setStyles === 'function'
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const batchedStyles = {}
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for (name in oldStyle) {
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if (!style[name]) {
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supportBatchUpdate
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? (batchedStyles[normalize(name)] = '')
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: elm.setStyle(normalize(name), '')
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}
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}
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for (name in style) {
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cur = style[name]
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supportBatchUpdate
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? (batchedStyles[normalize(name)] = cur)
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: elm.setStyle(normalize(name), cur)
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}
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if (supportBatchUpdate) {
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elm.setStyles(batchedStyles)
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}
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}
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function toObject (arr) {
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const res = {}
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for (let i = 0; i < arr.length; i++) {
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if (arr[i]) {
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extend(res, arr[i])
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}
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}
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return res
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}
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export default {
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create: createStyle,
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update: updateStyle
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}
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