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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 | 61x 61x 61x 1024x 65x 65x 16x 16x 16x 6x 16x 16x 6x 4x 1x 29x 29x 29x 29x | import {
NodeTransform,
NodeTypes,
ElementTypes,
ComponentNode,
IfBranchNode
} from '@vue/compiler-core'
import { TRANSITION } from '../runtimeHelpers'
import { createDOMCompilerError, DOMErrorCodes } from '../errors'
export const transformTransition: NodeTransform = (node, context) => {
if (
node.type === NodeTypes.ELEMENT &&
node.tagType === ElementTypes.COMPONENT
) {
const component = context.isBuiltInComponent(node.tag)
if (component === TRANSITION) {
return () => {
Iif (!node.children.length) {
return
}
// warn multiple transition children
if (hasMultipleChildren(node)) {
context.onError(
createDOMCompilerError(
DOMErrorCodes.X_TRANSITION_INVALID_CHILDREN,
{
start: node.children[0].loc.start,
end: node.children[node.children.length - 1].loc.end,
source: ''
}
)
)
}
// check if it's s single child w/ v-show
// if yes, inject "persisted: true" to the transition props
const child = node.children[0]
if (child.type === NodeTypes.ELEMENT) {
for (const p of child.props) {
if (p.type === NodeTypes.DIRECTIVE && p.name === 'show') {
node.props.push({
type: NodeTypes.ATTRIBUTE,
name: 'persisted',
value: undefined,
loc: node.loc
})
}
}
}
}
}
}
}
function hasMultipleChildren(node: ComponentNode | IfBranchNode): boolean {
// #1352 filter out potential comment nodes.
const children = (node.children = node.children.filter(
c =>
c.type !== NodeTypes.COMMENT &&
!(c.type === NodeTypes.TEXT && !c.content.trim())
))
const child = children[0]
return (
children.length !== 1 ||
child.type === NodeTypes.FOR ||
(child.type === NodeTypes.IF && child.branches.some(hasMultipleChildren))
)
}
|