/* @flow */
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/**
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* Runtime helper for rendering static trees.
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*/
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export function renderStatic (
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index: number,
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isInFor: boolean
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): VNode | Array<VNode> {
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const cached = this._staticTrees || (this._staticTrees = [])
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let tree = cached[index]
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// if has already-rendered static tree and not inside v-for,
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// we can reuse the same tree.
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if (tree && !isInFor) {
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return tree
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}
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// otherwise, render a fresh tree.
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tree = cached[index] = this.$options.staticRenderFns[index].call(
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this._renderProxy,
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null,
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this // for render fns generated for functional component templates
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)
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markStatic(tree, `__static__${index}`, false)
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return tree
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}
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/**
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* Runtime helper for v-once.
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* Effectively it means marking the node as static with a unique key.
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*/
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export function markOnce (
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tree: VNode | Array<VNode>,
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index: number,
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key: string
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) {
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markStatic(tree, `__once__${index}${key ? `_${key}` : ``}`, true)
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return tree
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}
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function markStatic (
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tree: VNode | Array<VNode>,
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key: string,
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isOnce: boolean
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) {
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if (Array.isArray(tree)) {
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for (let i = 0; i < tree.length; i++) {
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if (tree[i] && typeof tree[i] !== 'string') {
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markStaticNode(tree[i], `${key}_${i}`, isOnce)
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}
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}
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} else {
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markStaticNode(tree, key, isOnce)
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}
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}
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function markStaticNode (node, key, isOnce) {
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node.isStatic = true
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node.key = key
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node.isOnce = isOnce
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}
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