create-element.ts
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import config from '../config'
import VNode, { createEmptyVNode } from './vnode'
import { createComponent } from './create-component'
import { traverse } from '../observer/traverse'
import {
warn,
isDef,
isUndef,
isArray,
isTrue,
isObject,
isPrimitive,
resolveAsset,
isFunction
} from '../util/index'
import { normalizeChildren, simpleNormalizeChildren } from './helpers/index'
import type { Component } from 'types/component'
import type { VNodeData } from 'types/vnode'
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 | Array<VNode> {
if (isArray(data) || isPrimitive(data)) {
normalizationType = children
children = data
data = undefined
}
if (isTrue(alwaysNormalize)) {
normalizationType = ALWAYS_NORMALIZE
}
return _createElement(context, tag, data, children, normalizationType)
}
export function _createElement(
context: Component,
tag?: string | Component | Function | Object,
data?: VNodeData,
children?: any,
normalizationType?: number
): VNode | Array<VNode> {
if (isDef(data) && isDef((data as any).__ob__)) {
__DEV__ &&
warn(
`Avoid using observed data object as vnode data: ${JSON.stringify(
data
)}\n` + 'Always create fresh vnode data objects in each render!',
context
)
return createEmptyVNode()
}
// object syntax in v-bind
if (isDef(data) && isDef(data.is)) {
tag = data.is
}
if (!tag) {
// in case of component :is set to falsy value
return createEmptyVNode()
}
// warn against non-primitive key
if (__DEV__ && isDef(data) && isDef(data.key) && !isPrimitive(data.key)) {
warn(
'Avoid using non-primitive value as key, ' +
'use string/number value instead.',
context
)
}
// support single function children as default scoped slot
if (isArray(children) && isFunction(children[0])) {
data = data || {}
data.scopedSlots = { default: children[0] }
children.length = 0
}
if (normalizationType === ALWAYS_NORMALIZE) {
children = normalizeChildren(children)
} else if (normalizationType === SIMPLE_NORMALIZE) {
children = simpleNormalizeChildren(children)
}
let vnode, ns
if (typeof tag === 'string') {
let Ctor
ns = (context.$vnode && context.$vnode.ns) || config.getTagNamespace(tag)
if (config.isReservedTag(tag)) {
// platform built-in elements
if (
__DEV__ &&
isDef(data) &&
isDef(data.nativeOn) &&
data.tag !== 'component'
) {
warn(
`The .native modifier for v-on is only valid on components but it was used on <${tag}>.`,
context
)
}
vnode = new VNode(
config.parsePlatformTagName(tag),
data,
children,
undefined,
undefined,
context
)
} else if (
(!data || !data.pre) &&
isDef((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 as any, data, context, children)
}
if (isArray(vnode)) {
return vnode
} else if (isDef(vnode)) {
if (isDef(ns)) applyNS(vnode, ns)
if (isDef(data)) registerDeepBindings(data)
return vnode
} else {
return createEmptyVNode()
}
}
function applyNS(vnode, ns, force?: boolean) {
vnode.ns = ns
if (vnode.tag === 'foreignObject') {
// use default namespace inside foreignObject
ns = undefined
force = true
}
if (isDef(vnode.children)) {
for (let i = 0, l = vnode.children.length; i < l; i++) {
const child = vnode.children[i]
if (
isDef(child.tag) &&
(isUndef(child.ns) || (isTrue(force) && child.tag !== 'svg'))
) {
applyNS(child, ns, force)
}
}
}
}
// ref #5318
// necessary to ensure parent re-render when deep bindings like :style and
// :class are used on slot nodes
function registerDeepBindings(data) {
if (isObject(data.style)) {
traverse(data.style)
}
if (isObject(data.class)) {
traverse(data.class)
}
}