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type CallExpression,
type ConditionalExpression,
type DirectiveNode,
type ElementNode,
ElementTypes,
type ExpressionNode,
type FunctionExpression,
NodeTypes,
type ObjectExpression,
type Property,
type SlotsExpression,
type SourceLocation,
type TemplateChildNode,
createArrayExpression,
createCallExpression,
createConditionalExpression,
createFunctionExpression,
createObjectExpression,
createObjectProperty,
createSimpleExpression,
} from '../ast'
import type { NodeTransform, TransformContext } from '../transform'
import { ErrorCodes, createCompilerError } from '../errors'
import {
assert,
findDir,
hasScopeRef,
isCommentOrWhitespace,
isStaticExp,
isTemplateNode,
isVSlot,
isWhitespaceText,
} from '../utils'
import { CREATE_SLOTS, RENDER_LIST, WITH_CTX } from '../runtimeHelpers'
import { createForLoopParams, finalizeForParseResult } from './vFor'
import { SlotFlags, slotFlagsText } from '@vue/shared'
const defaultFallback = createSimpleExpression(`undefined`, false)
// A NodeTransform that:
// 1. Tracks scope identifiers for scoped slots so that they don't get prefixed
// by transformExpression. This is only applied in non-browser builds with
// { prefixIdentifiers: true }.
// 2. Track v-slot depths so that we know a slot is inside another slot.
// Note the exit callback is executed before buildSlots() on the same node,
// so only nested slots see positive numbers.
export const trackSlotScopes: NodeTransform = (node, context) => {
if (
node.type === NodeTypes.ELEMENT &&
(node.tagType === ElementTypes.COMPONENT ||
node.tagType === ElementTypes.TEMPLATE)
) {
// We are only checking non-empty v-slot here
// since we only care about slots that introduce scope variables.
const vSlot = findDir(node, 'slot')
if (vSlot) {
const slotProps = vSlot.exp
if (!__BROWSER__ && context.prefixIdentifiers) {
slotProps && context.addIdentifiers(slotProps)
}
context.scopes.vSlot++
return () => {
if (!__BROWSER__ && context.prefixIdentifiers) {
slotProps && context.removeIdentifiers(slotProps)
}
context.scopes.vSlot--
}
}
}
}
// A NodeTransform that tracks scope identifiers for scoped slots with v-for.
// This transform is only applied in non-browser builds with { prefixIdentifiers: true }
export const trackVForSlotScopes: NodeTransform = (node, context) => {
let vFor
if (
isTemplateNode(node) &&
node.props.some(isVSlot) &&
(vFor = findDir(node, 'for'))
) {
const result = vFor.forParseResult
if (result) {
finalizeForParseResult(result, context)
const { value, key, index } = result
const { addIdentifiers, removeIdentifiers } = context
value && addIdentifiers(value)
key && addIdentifiers(key)
index && addIdentifiers(index)
return () => {
value && removeIdentifiers(value)
key && removeIdentifiers(key)
index && removeIdentifiers(index)
}
}
}
}
export type SlotFnBuilder = (
slotProps: ExpressionNode | undefined,
vFor: DirectiveNode | undefined,
slotChildren: TemplateChildNode[],
loc: SourceLocation,
) => FunctionExpression
const buildClientSlotFn: SlotFnBuilder = (props, _vForExp, children, loc) =>
createFunctionExpression(
props,
children,
false /* newline */,
true /* isSlot */,
children.length ? children[0].loc : loc,
)
// Instead of being a DirectiveTransform, v-slot processing is called during
// transformElement to build the slots object for a component.
export function buildSlots(
node: ElementNode,
context: TransformContext,
buildSlotFn: SlotFnBuilder = buildClientSlotFn,
): {
slots: SlotsExpression
hasDynamicSlots: boolean
} {
context.helper(WITH_CTX)
const { children, loc } = node
const slotsProperties: Property[] = []
const dynamicSlots: (ConditionalExpression | CallExpression)[] = []
// If the slot is inside a v-for or another v-slot, force it to be dynamic
// since it likely uses a scope variable.
let hasDynamicSlots = context.scopes.vSlot > 0 || context.scopes.vFor > 0
// with `prefixIdentifiers: true`, this can be further optimized to make
// it dynamic when
// 1. the slot arg or exp uses the scope variables.
// 2. the slot children use the scope variables.
if (!__BROWSER__ && !context.ssr && context.prefixIdentifiers) {
hasDynamicSlots =
node.props.some(
prop =>
isVSlot(prop) &&
(hasScopeRef(prop.arg, context.identifiers) ||
hasScopeRef(prop.exp, context.identifiers)),
) || children.some(child => hasScopeRef(child, context.identifiers))
}
// 1. Check for slot with slotProps on component itself.
// <Comp v-slot="{ prop }"/>
const onComponentSlot = findDir(node, 'slot', true)
if (onComponentSlot) {
const { arg, exp } = onComponentSlot
if (arg && !isStaticExp(arg)) {
hasDynamicSlots = true
}
slotsProperties.push(
createObjectProperty(
arg || createSimpleExpression('default', true),
buildSlotFn(exp, undefined, children, loc),
),
)
}
// 2. Iterate through children and check for template slots
// <template v-slot:foo="{ prop }">
let hasTemplateSlots = false
let hasNamedDefaultSlot = false
const implicitDefaultChildren: TemplateChildNode[] = []
const seenSlotNames = new Set<string>()
let conditionalBranchIndex = 0
for (let i = 0; i < children.length; i++) {
const slotElement = children[i]
let slotDir
if (
!isTemplateNode(slotElement) ||
!(slotDir = findDir(slotElement, 'slot', true))
) {
// not a <template v-slot>, skip.
if (slotElement.type !== NodeTypes.COMMENT) {
implicitDefaultChildren.push(slotElement)
}
continue
}
if (onComponentSlot) {
// already has on-component slot - this is incorrect usage.
context.onError(
createCompilerError(ErrorCodes.X_V_SLOT_MIXED_SLOT_USAGE, slotDir.loc),
)
break
}
hasTemplateSlots = true
const { children: slotChildren, loc: slotLoc } = slotElement
const {
arg: slotName = createSimpleExpression(`default`, true),
exp: slotProps,
loc: dirLoc,
} = slotDir
// check if name is dynamic.
let staticSlotName: string | undefined
if (isStaticExp(slotName)) {
staticSlotName = slotName ? slotName.content : `default`
} else {
hasDynamicSlots = true
}
const vFor = findDir(slotElement, 'for')
const slotFunction = buildSlotFn(slotProps, vFor, slotChildren, slotLoc)
// check if this slot is conditional (v-if/v-for)
let vIf: DirectiveNode | undefined
let vElse: DirectiveNode | undefined
if ((vIf = findDir(slotElement, 'if'))) {
hasDynamicSlots = true
dynamicSlots.push(
createConditionalExpression(
vIf.exp!,
buildDynamicSlot(slotName, slotFunction, conditionalBranchIndex++),
defaultFallback,
),
)
} else if (
(vElse = findDir(slotElement, /^else(?:-if)?$/, true /* allowEmpty */))
) {
// find adjacent v-if
let j = i
let prev
while (j--) {
prev = children[j]
if (!isCommentOrWhitespace(prev)) {
break
}
}
if (prev && isTemplateNode(prev) && findDir(prev, /^(?:else-)?if$/)) {
__TEST__ && assert(dynamicSlots.length > 0)
// attach this slot to previous conditional
let conditional = dynamicSlots[
dynamicSlots.length - 1
] as ConditionalExpression
while (
conditional.alternate.type === NodeTypes.JS_CONDITIONAL_EXPRESSION
) {
conditional = conditional.alternate
}
conditional.alternate = vElse.exp
? createConditionalExpression(
vElse.exp,
buildDynamicSlot(
slotName,
slotFunction,
conditionalBranchIndex++,
),
defaultFallback,
)
: buildDynamicSlot(slotName, slotFunction, conditionalBranchIndex++)
} else {
context.onError(
createCompilerError(ErrorCodes.X_V_ELSE_NO_ADJACENT_IF, vElse.loc),
)
}
} else if (vFor) {
hasDynamicSlots = true
const parseResult = vFor.forParseResult
if (parseResult) {
finalizeForParseResult(parseResult, context)
// Render the dynamic slots as an array and add it to the createSlot()
// args. The runtime knows how to handle it appropriately.
dynamicSlots.push(
createCallExpression(context.helper(RENDER_LIST), [
parseResult.source,
createFunctionExpression(
createForLoopParams(parseResult),
buildDynamicSlot(slotName, slotFunction),
true /* force newline */,
),
]),
)
} else {
context.onError(
createCompilerError(
ErrorCodes.X_V_FOR_MALFORMED_EXPRESSION,
vFor.loc,
),
)
}
} else {
// check duplicate static names
if (staticSlotName) {
if (seenSlotNames.has(staticSlotName)) {
context.onError(
createCompilerError(
ErrorCodes.X_V_SLOT_DUPLICATE_SLOT_NAMES,
dirLoc,
),
)
continue
}
seenSlotNames.add(staticSlotName)
if (staticSlotName === 'default') {
hasNamedDefaultSlot = true
}
}
slotsProperties.push(createObjectProperty(slotName, slotFunction))
}
}
if (!onComponentSlot) {
const buildDefaultSlotProperty = (
props: ExpressionNode | undefined,
children: TemplateChildNode[],
) => {
const fn = buildSlotFn(props, undefined, children, loc)
if (__COMPAT__ && context.compatConfig) {
fn.isNonScopedSlot = true
}
return createObjectProperty(`default`, fn)
}
if (!hasTemplateSlots) {
// implicit default slot (on component)
slotsProperties.push(buildDefaultSlotProperty(undefined, children))
} else if (
implicitDefaultChildren.length &&
// #3766
// with whitespace: 'preserve', whitespaces between slots will end up in
// implicitDefaultChildren. Ignore if all implicit children are whitespaces.
!implicitDefaultChildren.every(isWhitespaceText)
) {
// implicit default slot (mixed with named slots)
if (hasNamedDefaultSlot) {
context.onError(
createCompilerError(
ErrorCodes.X_V_SLOT_EXTRANEOUS_DEFAULT_SLOT_CHILDREN,
implicitDefaultChildren[0].loc,
),
)
} else {
slotsProperties.push(
buildDefaultSlotProperty(undefined, implicitDefaultChildren),
)
}
}
}
const slotFlag = hasDynamicSlots
? SlotFlags.DYNAMIC
: hasForwardedSlots(node.children)
? SlotFlags.FORWARDED
: SlotFlags.STABLE
let slots = createObjectExpression(
slotsProperties.concat(
createObjectProperty(
`_`,
// 2 = compiled but dynamic = can skip normalization, but must run diff
// 1 = compiled and static = can skip normalization AND diff as optimized
createSimpleExpression(
slotFlag + (__DEV__ ? ` /* ${slotFlagsText[slotFlag]} */` : ``),
false,
),
),
),
loc,
) as SlotsExpression
if (dynamicSlots.length) {
slots = createCallExpression(context.helper(CREATE_SLOTS), [
slots,
createArrayExpression(dynamicSlots),
]) as SlotsExpression
}
return {
slots,
hasDynamicSlots,
}
}
function buildDynamicSlot(
name: ExpressionNode,
fn: FunctionExpression,
index?: number,
): ObjectExpression {
const props = [
createObjectProperty(`name`, name),
createObjectProperty(`fn`, fn),
]
if (index != null) {
props.push(
createObjectProperty(`key`, createSimpleExpression(String(index), true)),
)
}
return createObjectExpression(props)
}
function hasForwardedSlots(children: TemplateChildNode[]): boolean {
for (let i = 0; i < children.length; i++) {
const child = children[i]
switch (child.type) {
case NodeTypes.ELEMENT:
if (
child.tagType === ElementTypes.SLOT ||
hasForwardedSlots(child.children)
) {
return true
}
break
case NodeTypes.IF:
if (hasForwardedSlots(child.branches)) return true
break
case NodeTypes.IF_BRANCH:
case NodeTypes.FOR:
if (hasForwardedSlots(child.children)) return true
break
default:
break
}
}
return false
}
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