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createStructuralDirectiveTransform,
TransformContext
} from '../transform'
import {
NodeTypes,
ExpressionNode,
createSimpleExpression,
SourceLocation,
SimpleExpressionNode,
createCallExpression,
createFunctionExpression,
createObjectExpression,
createObjectProperty,
ForCodegenNode,
RenderSlotCall,
SlotOutletNode,
ElementNode,
DirectiveNode,
ForNode,
PlainElementNode,
createVNodeCall,
VNodeCall,
ForRenderListExpression,
BlockCodegenNode,
ForIteratorExpression,
ConstantTypes,
createBlockStatement,
createCompoundExpression
} from '../ast'
import { createCompilerError, ErrorCodes } from '../errors'
import {
getInnerRange,
findProp,
isTemplateNode,
isSlotOutlet,
injectProp,
getVNodeBlockHelper,
getVNodeHelper,
findDir
} from '../utils'
import {
RENDER_LIST,
OPEN_BLOCK,
FRAGMENT,
IS_MEMO_SAME
} from '../runtimeHelpers'
import { processExpression } from './transformExpression'
import { validateBrowserExpression } from '../validateExpression'
import { PatchFlags, PatchFlagNames } from '@vue/shared'
export const transformFor = 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`)
const keyExp =
keyProp &&
(keyProp.type === NodeTypes.ATTRIBUTE
? createSimpleExpression(keyProp.value!.content, true)
: keyProp.exp!)
const keyProperty = keyProp ? createObjectProperty(`key`, keyExp!) : null
if (!__BROWSER__ && isTemplate) {
// #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 (memo) {
memo.exp = processExpression(
memo.exp! as SimpleExpressionNode,
context
)
}
if (keyProperty && keyProp!.type !== NodeTypes.ATTRIBUTE) {
keyProperty.value = processExpression(
keyProperty.value as SimpleExpressionNode,
context
)
}
}
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 +
(__DEV__ ? ` /* ${PatchFlagNames[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
Iif (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 +
(__DEV__
? ` /* ${PatchFlagNames[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)
}
if (childBlock.isBlock !== !isStableFragment) {
Iif (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 = !isStableFragment
if (childBlock.isBlock) {
helper(OPEN_BLOCK)
helper(getVNodeBlockHelper(context.inSSR, childBlock.isComponent))
} else {
helper(getVNodeHelper(context.inSSR, childBlock.isComponent))
}
}
if (memo) {
const loop = createFunctionExpression(
createForLoopParams(forNode.parseResult, [
createSimpleExpression(`_cached`)
])
)
loop.body = createBlockStatement([
createCompoundExpression([`const _memo = (`, memo.exp!, `)`]),
createCompoundExpression([
`if (_cached`,
...(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++))
)
} 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
) {
if (!dir.exp) {
context.onError(
createCompilerError(ErrorCodes.X_V_FOR_NO_EXPRESSION, dir.loc)
)
return
}
const parseResult = parseForExpression(
// can only be simple expression because vFor transform is applied
// before expression transform.
dir.exp as SimpleExpressionNode,
context
)
if (!parseResult) {
context.onError(
createCompilerError(ErrorCodes.X_V_FOR_MALFORMED_EXPRESSION, dir.loc)
)
return
}
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 () => {
scopes.vFor--
if (!__BROWSER__ && context.prefixIdentifiers) {
value && removeIdentifiers(value)
key && removeIdentifiers(key)
index && removeIdentifiers(index)
}
if (onExit) onExit()
}
}
const forAliasRE = /([\s\S]*?)\s+(?:in|of)\s+([\s\S]*)/
// This regex doesn't cover the case if key or index aliases have destructuring,
// but those do not make sense in the first place, so this works in practice.
const forIteratorRE = /,([^,\}\]]*)(?:,([^,\}\]]*))?$/
const stripParensRE = /^\(|\)$/g
export interface ForParseResult {
source: ExpressionNode
value: ExpressionNode | undefined
key: ExpressionNode | undefined
index: ExpressionNode | undefined
}
export function parseForExpression(
input: SimpleExpressionNode,
context: TransformContext
): ForParseResult | undefined {
const loc = input.loc
const exp = input.content
const inMatch = exp.match(forAliasRE)
if (!inMatch) return
const [, LHS, RHS] = inMatch
const result: ForParseResult = {
source: createAliasExpression(
loc,
RHS.trim(),
exp.indexOf(RHS, LHS.length)
),
value: undefined,
key: undefined,
index: undefined
}
if (!__BROWSER__ && context.prefixIdentifiers) {
result.source = processExpression(
result.source as SimpleExpressionNode,
context
)
}
Iif (__DEV__ && __BROWSER__) {
validateBrowserExpression(result.source as SimpleExpressionNode, context)
}
let valueContent = LHS.trim().replace(stripParensRE, '').trim()
const trimmedOffset = LHS.indexOf(valueContent)
const iteratorMatch = valueContent.match(forIteratorRE)
if (iteratorMatch) {
valueContent = valueContent.replace(forIteratorRE, '').trim()
const keyContent = iteratorMatch[1].trim()
let keyOffset: number | undefined
if (keyContent) {
keyOffset = exp.indexOf(keyContent, trimmedOffset + valueContent.length)
result.key = createAliasExpression(loc, keyContent, keyOffset)
if (!__BROWSER__ && context.prefixIdentifiers) {
result.key = processExpression(result.key, context, true)
}
Iif (__DEV__ && __BROWSER__) {
validateBrowserExpression(
result.key as SimpleExpressionNode,
context,
true
)
}
}
if (iteratorMatch[2]) {
const indexContent = iteratorMatch[2].trim()
if (indexContent) {
result.index = createAliasExpression(
loc,
indexContent,
exp.indexOf(
indexContent,
result.key
? keyOffset! + keyContent.length
: trimmedOffset + valueContent.length
)
)
if (!__BROWSER__ && context.prefixIdentifiers) {
result.index = processExpression(result.index, context, true)
}
Iif (__DEV__ && __BROWSER__) {
validateBrowserExpression(
result.index as SimpleExpressionNode,
context,
true
)
}
}
}
}
if (valueContent) {
result.value = createAliasExpression(loc, valueContent, trimmedOffset)
if (!__BROWSER__ && context.prefixIdentifiers) {
result.value = processExpression(result.value, context, true)
}
Iif (__DEV__ && __BROWSER__) {
validateBrowserExpression(
result.value as SimpleExpressionNode,
context,
true
)
}
}
return result
}
function createAliasExpression(
range: SourceLocation,
content: string,
offset: number
): SimpleExpressionNode {
return createSimpleExpression(
content,
false,
getInnerRange(range, offset, content.length)
)
}
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))
}
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