Press n or j to go to the next uncovered block, b, p or k for the previous block.
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type NodeTransform,
type TransformContext,
createStructuralDirectiveTransform,
} from '../transform'
import {
type BlockCodegenNode,
ConstantTypes,
type DirectiveNode,
type ElementNode,
type ExpressionNode,
type ForCodegenNode,
type ForIteratorExpression,
type ForNode,
type ForParseResult,
type ForRenderListExpression,
NodeTypes,
type PlainElementNode,
type RenderSlotCall,
type SimpleExpressionNode,
type SlotOutletNode,
type VNodeCall,
createBlockStatement,
createCallExpression,
createCompoundExpression,
createFunctionExpression,
createObjectExpression,
createObjectProperty,
createSimpleExpression,
createVNodeCall,
getVNodeBlockHelper,
getVNodeHelper,
} from '../ast'
import { ErrorCodes, createCompilerError } from '../errors'
import {
findDir,
findProp,
injectProp,
isSlotOutlet,
isTemplateNode,
} from '../utils'
import {
FRAGMENT,
IS_MEMO_SAME,
OPEN_BLOCK,
RENDER_LIST,
} from '../runtimeHelpers'
import { processExpression } from './transformExpression'
import { validateBrowserExpression } from '../validateExpression'
import { PatchFlags } from '@vue/shared'
export const transformFor: NodeTransform = createStructuralDirectiveTransform(
'for',
(node, dir, context) => {
const { helper, removeHelper } = context
return processFor(node, dir, context, forNode => {
// create the loop render function expression now, and add the
// iterator on exit after all children have been traversed
const renderExp = createCallExpression(helper(RENDER_LIST), [
forNode.source,
]) as ForRenderListExpression
const isTemplate = isTemplateNode(node)
const memo = findDir(node, 'memo')
const keyProp = findProp(node, `key`, false, true)
const isDirKey = keyProp && keyProp.type === NodeTypes.DIRECTIVE
let keyExp =
keyProp &&
(keyProp.type === NodeTypes.ATTRIBUTE
? keyProp.value
? createSimpleExpression(keyProp.value.content, true)
: undefined
: keyProp.exp)
const keyProperty = keyExp ? createObjectProperty(`key`, keyExp) : null
Eif (!__BROWSER__) {
// #2085 / #5288 process :key and v-memo expressions need to be
// processed on `<template v-for>`. In this case the node is discarded
// and never traversed so its binding expressions won't be processed
// by the normal transforms.
if (isTemplate && memo) {
memo.exp = processExpression(
memo.exp! as SimpleExpressionNode,
context,
)
}
if ((isTemplate || memo) && keyProperty && isDirKey) {
keyExp =
keyProp.exp =
keyProperty.value =
processExpression(
keyProperty.value as SimpleExpressionNode,
context,
)
if (memo) {
context.vForMemoKeyedNodes.add(node)
}
}
}
const isStableFragment =
forNode.source.type === NodeTypes.SIMPLE_EXPRESSION &&
forNode.source.constType > ConstantTypes.NOT_CONSTANT
const fragmentFlag = isStableFragment
? PatchFlags.STABLE_FRAGMENT
: keyProp
? PatchFlags.KEYED_FRAGMENT
: PatchFlags.UNKEYED_FRAGMENT
forNode.codegenNode = createVNodeCall(
context,
helper(FRAGMENT),
undefined,
renderExp,
fragmentFlag,
undefined,
undefined,
true /* isBlock */,
!isStableFragment /* disableTracking */,
false /* isComponent */,
node.loc,
) as ForCodegenNode
return () => {
// finish the codegen now that all children have been traversed
let childBlock: BlockCodegenNode
const { children } = forNode
// check <template v-for> key placement
if ((__DEV__ || !__BROWSER__) && isTemplate) {
node.children.some(c => {
if (c.type === NodeTypes.ELEMENT) {
const key = findProp(c, 'key')
if (key) {
context.onError(
createCompilerError(
ErrorCodes.X_V_FOR_TEMPLATE_KEY_PLACEMENT,
key.loc,
),
)
return true
}
}
})
}
const needFragmentWrapper =
children.length !== 1 || children[0].type !== NodeTypes.ELEMENT
const slotOutlet = isSlotOutlet(node)
? node
: isTemplate &&
node.children.length === 1 &&
isSlotOutlet(node.children[0])
? (node.children[0] as SlotOutletNode) // api-extractor somehow fails to infer this
: null
if (slotOutlet) {
// <slot v-for="..."> or <template v-for="..."><slot/></template>
childBlock = slotOutlet.codegenNode as RenderSlotCall
if (isTemplate && keyProperty) {
// <template v-for="..." :key="..."><slot/></template>
// we need to inject the key to the renderSlot() call.
// the props for renderSlot is passed as the 3rd argument.
injectProp(childBlock, keyProperty, context)
}
} else if (needFragmentWrapper) {
// <template v-for="..."> with text or multi-elements
// should generate a fragment block for each loop
childBlock = createVNodeCall(
context,
helper(FRAGMENT),
keyProperty ? createObjectExpression([keyProperty]) : undefined,
node.children,
PatchFlags.STABLE_FRAGMENT,
undefined,
undefined,
true,
undefined,
false /* isComponent */,
)
} else {
// Normal element v-for. Directly use the child's codegenNode
// but mark it as a block.
childBlock = (children[0] as PlainElementNode)
.codegenNode as VNodeCall
if (isTemplate && keyProperty) {
injectProp(childBlock, keyProperty, context)
}
const shouldUseBlock =
!isStableFragment || childBlock.isBlockRequired === true
if (childBlock.isBlock !== shouldUseBlock) {
if (childBlock.isBlock) {
// switch from block to vnode
removeHelper(OPEN_BLOCK)
removeHelper(
getVNodeBlockHelper(context.inSSR, childBlock.isComponent),
)
} else {
// switch from vnode to block
removeHelper(
getVNodeHelper(context.inSSR, childBlock.isComponent),
)
}
}
childBlock.isBlock = shouldUseBlock
if (childBlock.isBlock) {
helper(OPEN_BLOCK)
helper(getVNodeBlockHelper(context.inSSR, childBlock.isComponent))
} else {
helper(getVNodeHelper(context.inSSR, childBlock.isComponent))
if (childBlock.needsPatch) {
childBlock.patchFlag = ((childBlock.patchFlag ?? 0) |
PatchFlags.NEED_PATCH) as PatchFlags
}
}
}
if (memo) {
const loop = createFunctionExpression(
createForLoopParams(forNode.parseResult, [
createSimpleExpression(`_cached`),
]),
)
loop.body = createBlockStatement([
createCompoundExpression([`const _memo = (`, memo.exp!, `)`]),
createCompoundExpression([
`if (_cached && _cached.el`,
...(keyExp ? [` && _cached.key === `, keyExp] : []),
` && ${context.helperString(
IS_MEMO_SAME,
)}(_cached, _memo)) return _cached`,
]),
createCompoundExpression([`const _item = `, childBlock as any]),
createSimpleExpression(`_item.memo = _memo`),
createSimpleExpression(`return _item`),
])
renderExp.arguments.push(
loop as ForIteratorExpression,
createSimpleExpression(`_cache`),
createSimpleExpression(String(context.cached.length)),
)
// increment cache count
context.cached.push(null)
} else {
renderExp.arguments.push(
createFunctionExpression(
createForLoopParams(forNode.parseResult),
childBlock,
true /* force newline */,
) as ForIteratorExpression,
)
}
}
})
},
)
// target-agnostic transform used for both Client and SSR
export function processFor(
node: ElementNode,
dir: DirectiveNode,
context: TransformContext,
processCodegen?: (forNode: ForNode) => (() => void) | undefined,
): (() => void) | undefined {
if (!dir.exp) {
context.onError(
createCompilerError(ErrorCodes.X_V_FOR_NO_EXPRESSION, dir.loc),
)
return
}
const parseResult = dir.forParseResult
if (!parseResult) {
context.onError(
createCompilerError(ErrorCodes.X_V_FOR_MALFORMED_EXPRESSION, dir.loc),
)
return
}
finalizeForParseResult(parseResult, context)
const { addIdentifiers, removeIdentifiers, scopes } = context
const { source, value, key, index } = parseResult
const forNode: ForNode = {
type: NodeTypes.FOR,
loc: dir.loc,
source,
valueAlias: value,
keyAlias: key,
objectIndexAlias: index,
parseResult,
children: isTemplateNode(node) ? node.children : [node],
}
context.replaceNode(forNode)
// bookkeeping
scopes.vFor++
if (!__BROWSER__ && context.prefixIdentifiers) {
// scope management
// inject identifiers to context
value && addIdentifiers(value)
key && addIdentifiers(key)
index && addIdentifiers(index)
}
const onExit = processCodegen && processCodegen(forNode)
return (): void => {
scopes.vFor--
if (!__BROWSER__ && context.prefixIdentifiers) {
value && removeIdentifiers(value)
key && removeIdentifiers(key)
index && removeIdentifiers(index)
}
if (onExit) onExit()
}
}
export function finalizeForParseResult(
result: ForParseResult,
context: TransformContext,
): void {
if (result.finalized) return
if (!__BROWSER__ && context.prefixIdentifiers) {
result.source = processExpression(
result.source as SimpleExpressionNode,
context,
)
if (result.key) {
result.key = processExpression(
result.key as SimpleExpressionNode,
context,
true,
)
}
if (result.index) {
result.index = processExpression(
result.index as SimpleExpressionNode,
context,
true,
)
}
Eif (result.value) {
result.value = processExpression(
result.value as SimpleExpressionNode,
context,
true,
)
}
}
Iif (__DEV__ && __BROWSER__) {
validateBrowserExpression(result.source as SimpleExpressionNode, context)
if (result.key) {
validateBrowserExpression(
result.key as SimpleExpressionNode,
context,
true,
)
}
if (result.index) {
validateBrowserExpression(
result.index as SimpleExpressionNode,
context,
true,
)
}
if (result.value) {
validateBrowserExpression(
result.value as SimpleExpressionNode,
context,
true,
)
}
}
result.finalized = true
}
export function createForLoopParams(
{ value, key, index }: ForParseResult,
memoArgs: ExpressionNode[] = [],
): ExpressionNode[] {
return createParamsList([value, key, index, ...memoArgs])
}
function createParamsList(
args: (ExpressionNode | undefined)[],
): ExpressionNode[] {
let i = args.length
while (i--) {
if (args[i]) break
}
return args
.slice(0, i + 1)
.map((arg, i) => arg || createSimpleExpression(`_`.repeat(i + 1), false))
}
|