Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 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 | 90x 90x 90x 90x 90x 1282x 612x 612x 597x 15x 15x 15x 15x 15x 12x 15x | import { NodeTransform } from '../transform'
import { findDir, makeBlock } from '../utils'
import {
createCallExpression,
createFunctionExpression,
ElementTypes,
MemoExpression,
NodeTypes,
PlainElementNode
} from '../ast'
import { WITH_MEMO } from '../runtimeHelpers'
const seen = new WeakSet()
export const transformMemo: NodeTransform = (node, context) => {
if (node.type === NodeTypes.ELEMENT) {
const dir = findDir(node, 'memo')
if (!dir || seen.has(node)) {
return
}
seen.add(node)
return () => {
const codegenNode =
node.codegenNode ||
(context.currentNode as PlainElementNode).codegenNode
if (codegenNode && codegenNode.type === NodeTypes.VNODE_CALL) {
// non-component sub tree should be turned into a block
if (node.tagType !== ElementTypes.COMPONENT) {
makeBlock(codegenNode, context)
}
node.codegenNode = createCallExpression(context.helper(WITH_MEMO), [
dir.exp!,
createFunctionExpression(undefined, codegenNode),
`_cache`,
String(context.cached++)
]) as MemoExpression
}
}
}
}
|