create-element.js
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/* @flow */
import VNode, { createEmptyVNode } from './vnode'
import config from '../config'
import { createComponent } from './create-component'
import { normalizeChildren, simpleNormalizeChildren } from './helpers/index'
import { warn, resolveAsset, isPrimitive } from '../util/index'
const SIMPLE_NORMALIZE = 1
const ALWAYS_NORMALIZE = 2
// wrapper function for providing a more flexible interface
// without getting yelled at by flow
export function createElement (
context: Component,
tag: any,
data: any,
children: any,
normalizationType: any,
alwaysNormalize: boolean
): VNode {
if (Array.isArray(data) || isPrimitive(data)) {
normalizationType = children
children = data
data = undefined
}
if (alwaysNormalize) normalizationType = ALWAYS_NORMALIZE
return _createElement(context, tag, data, children, normalizationType)
}
export function _createElement (
context: Component,
tag?: string | Class<Component> | Function | Object,
data?: VNodeData,
children?: any,
normalizationType?: number
): VNode {
if (data && data.__ob__) {
process.env.NODE_ENV !== 'production' && warn(
`Avoid using observed data object as vnode data: ${JSON.stringify(data)}\n` +
'Always create fresh vnode data objects in each render!',
context
)
return createEmptyVNode()
}
if (!tag) {
// in case of component :is set to falsy value
return createEmptyVNode()
}
// support single function children as default scoped slot
if (Array.isArray(children) &&
typeof children[0] === 'function') {
data = data || {}
data.scopedSlots = { default: children[0] }
children.length = 0
}
if (normalizationType === ALWAYS_NORMALIZE) {
children = normalizeChildren(children)
} else if (normalizationType === SIMPLE_NORMALIZE) {
children = simpleNormalizeChildren(children)
}
let vnode, ns
if (typeof tag === 'string') {
let Ctor
ns = config.getTagNamespace(tag)
if (config.isReservedTag(tag)) {
// platform built-in elements
vnode = new VNode(
config.parsePlatformTagName(tag), data, children,
undefined, undefined, context
)
} else if ((Ctor = resolveAsset(context.$options, 'components', tag))) {
// component
vnode = createComponent(Ctor, data, context, children, tag)
} else {
// unknown or unlisted namespaced elements
// check at runtime because it may get assigned a namespace when its
// parent normalizes children
vnode = new VNode(
tag, data, children,
undefined, undefined, context
)
}
} else {
// direct component options / constructor
vnode = createComponent(tag, data, context, children)
}
if (vnode) {
if (ns) applyNS(vnode, ns)
return vnode
} else {
return createEmptyVNode()
}
}
function applyNS (vnode, ns) {
vnode.ns = ns
if (vnode.tag === 'foreignObject') {
// use default namespace inside foreignObject
return
}
if (vnode.children) {
for (let i = 0, l = vnode.children.length; i < l; i++) {
const child = vnode.children[i]
if (child.tag && !child.ns) {
applyNS(child, ns)
}
}
}
}