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/* @flow */ import VNode, { createTextVNode } from 'core/vdom/vnode' import { isFalse, isTrue, isDef, isUndef, isPrimitive } from 'shared/util' // The template compiler attempts to minimize the need for normalization by // statically analyzing the template at compile time. // // For plain HTML markup, normalization can be completely skipped because the // generated render function is guaranteed to return Array<VNode>. There are // two cases where extra normalization is needed: // 1. When the children contains components - because a functional component // may return an Array instead of a single root. In this case, just a simple // normalization is needed - if any child is an Array, we flatten the whole // thing with Array.prototype.concat. It is guaranteed to be only 1-level deep // because functional components already normalize their own children. export function simpleNormalizeChildren (children: any) { for (let i = 0; i < children.length; i++) { if (Array.isArray(children[i])) { return Array.prototype.concat.apply([], children) } } return children } // 2. When the children contains constructs that always generated nested Arrays, // e.g. <template>, <slot>, v-for, or when the children is provided by user // with hand-written render functions / JSX. In such cases a full normalization // is needed to cater to all possible types of children values. export function normalizeChildren (children: any): ?Array<VNode> { return isPrimitive(children) ? [createTextVNode(children)] : Array.isArray(children) ? normalizeArrayChildren(children) : undefined } function isTextNode (node): boolean { return isDef(node) && isDef(node.text) && isFalse(node.isComment) } function normalizeArrayChildren (children: any, nestedIndex?: string): Array<VNode> { const res = [] let i, c, lastIndex, last for (i = 0; i < children.length; i++) { c = children[i] if (isUndef(c) || typeof c === 'boolean') continue lastIndex = res.length - 1 last = res[lastIndex] // nested if (Array.isArray(c)) { if (c.length > 0) { c = normalizeArrayChildren(c, `${nestedIndex || ''}_${i}`) // merge adjacent text nodes if (isTextNode(c[0]) && isTextNode(last)) { res[lastIndex] = createTextVNode(last.text + (c[0]: any).text) c.shift() } res.push.apply(res, c) } } else if (isPrimitive(c)) { if (isTextNode(last)) { // merge adjacent text nodes // this is necessary for SSR hydration because text nodes are // essentially merged when rendered to HTML strings res[lastIndex] = createTextVNode(last.text + c) } else if (c !== '') { // convert primitive to vnode res.push(createTextVNode(c)) } } else { if (isTextNode(c) && isTextNode(last)) { // merge adjacent text nodes res[lastIndex] = createTextVNode(last.text + c.text) } else { // default key for nested array children (likely generated by v-for) if (isTrue(children._isVList) && isDef(c.tag) && isUndef(c.key) && isDef(nestedIndex)) { c.key = `__vlist${nestedIndex}_${i}__` } res.push(c) } } } return res }