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ElementNode,
ObjectExpression,
createObjectExpression,
NodeTypes,
createObjectProperty,
createSimpleExpression,
createFunctionExpression,
DirectiveNode,
ElementTypes,
ExpressionNode,
Property,
TemplateChildNode,
SourceLocation,
createConditionalExpression,
ConditionalExpression,
SimpleExpressionNode,
FunctionExpression,
CallExpression,
createCallExpression,
createArrayExpression,
SlotsExpression
} from '../ast'
import { TransformContext, NodeTransform } from '../transform'
import { createCompilerError, ErrorCodes } from '../errors'
import {
findDir,
isTemplateNode,
assert,
isVSlot,
hasScopeRef,
isStaticExp
} from '../utils'
import { CREATE_SLOTS, RENDER_LIST, WITH_CTX } from '../runtimeHelpers'
import { parseForExpression, createForLoopParams } 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.parseResult = parseForExpression(
vFor.exp as SimpleExpressionNode,
context
))
if (result) {
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,
slotChildren: TemplateChildNode[],
loc: SourceLocation
) => FunctionExpression
const buildClientSlotFn: SlotFnBuilder = (props, 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 only when the slot actually uses the scope variables.
if (!__BROWSER__ && !context.ssr && context.prefixIdentifiers) {
hasDynamicSlots = hasScopeRef(node, 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, 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>()
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 slotFunction = buildSlotFn(slotProps, slotChildren, slotLoc)
// check if this slot is conditional (v-if/v-for)
let vIf: DirectiveNode | undefined
let vElse: DirectiveNode | undefined
let vFor: DirectiveNode | undefined
if ((vIf = findDir(slotElement, 'if'))) {
hasDynamicSlots = true
dynamicSlots.push(
createConditionalExpression(
vIf.exp!,
buildDynamicSlot(slotName, slotFunction),
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 (prev.type !== NodeTypes.COMMENT) {
break
}
}
if (prev && isTemplateNode(prev) && findDir(prev, 'if')) {
// remove node
children.splice(i, 1)
i--
__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),
defaultFallback
)
: buildDynamicSlot(slotName, slotFunction)
} else E{
context.onError(
createCompilerError(ErrorCodes.X_V_ELSE_NO_ADJACENT_IF, vElse.loc)
)
}
} else if ((vFor = findDir(slotElement, 'for'))) {
hasDynamicSlots = true
const parseResult =
vFor.parseResult ||
parseForExpression(vFor.exp as SimpleExpressionNode, context)
if (parseResult) {
// 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 E{
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, 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.some(node => isNonWhitespaceContent(node))
) {
// 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
): ObjectExpression {
return createObjectExpression([
createObjectProperty(`name`, name),
createObjectProperty(`fn`, fn)
])
}
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
}
function isNonWhitespaceContent(node: TemplateChildNode): boolean {
if (node.type !== NodeTypes.TEXT && node.type !== NodeTypes.TEXT_CALL)
return true
return node.type === NodeTypes.TEXT
? !!node.content.trim()
: isNonWhitespaceContent(node.content)
}
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