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feat(compiler): support v-for on named slots

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This commit is contained in:
Evan You
2019-10-02 23:10:41 -04:00
parent f401ac6b88
commit fc47029ed3
18 changed files with 645 additions and 277 deletions
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203
packages/compiler-core/src/transforms/vSlot.ts
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@@ -15,23 +15,23 @@ import {
createConditionalExpression,
ConditionalExpression,
JSChildNode,
SimpleExpressionNode
SimpleExpressionNode,
FunctionExpression,
CallExpression,
createCallExpression,
createArrayExpression
} from '../ast'
import { TransformContext, NodeTransform } from '../transform'
import { createCompilerError, ErrorCodes } from '../errors'
import { mergeExpressions, findDir } from '../utils'
export const isVSlot = (p: ElementNode['props'][0]): p is DirectiveNode =>
p.type === NodeTypes.DIRECTIVE && p.name === 'slot'
import { findDir, isTemplateNode, assert, isVSlot } from '../utils'
import { CREATE_SLOTS, RENDER_LIST } from '../runtimeConstants'
import { parseForExpression, createForLoopParams } from './vFor'
const isStaticExp = (p: JSChildNode): p is SimpleExpressionNode =>
p.type === NodeTypes.SIMPLE_EXPRESSION && p.isStatic
const defaultFallback = createSimpleExpression(`undefined`, false)
const hasSameName = (slot: Property, name: string): boolean =>
isStaticExp(slot.key) && slot.key.content === name
// A NodeTransform that tracks scope identifiers for scoped slots so that they
// don't get prefixed by transformExpression. This transform is only applied
// in non-browser builds with { prefixIdentifiers: true }
@@ -41,11 +41,42 @@ export const trackSlotScopes: NodeTransform = (node, context) => {
(node.tagType === ElementTypes.COMPONENT ||
node.tagType === ElementTypes.TEMPLATE)
) {
const vSlot = node.props.find(isVSlot)
if (vSlot && vSlot.exp) {
context.addIdentifiers(vSlot.exp)
const vSlot = findDir(node, 'slot')
if (vSlot) {
const { addIdentifiers, removeIdentifiers } = context
const slotProps = vSlot.exp
slotProps && addIdentifiers(slotProps)
return () => {
context.removeIdentifiers(vSlot.exp!)
slotProps && removeIdentifiers(slotProps)
}
}
}
}
// 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)
}
}
}
@@ -54,18 +85,20 @@ export const trackSlotScopes: NodeTransform = (node, context) => {
// Instead of being a DirectiveTransform, v-slot processing is called during
// transformElement to build the slots object for a component.
export function buildSlots(
{ props, children, loc }: ElementNode,
node: ElementNode,
context: TransformContext
): {
slots: ObjectExpression
slots: ObjectExpression | CallExpression
hasDynamicSlots: boolean
} {
const slots: Property[] = []
const { children, loc } = node
const slotsProperties: Property[] = []
const dynamicSlots: (ConditionalExpression | CallExpression)[] = []
let hasDynamicSlots = false
// 1. Check for default slot with slotProps on component itself.
// <Comp v-slot="{ prop }"/>
const explicitDefaultSlot = props.find(isVSlot)
const explicitDefaultSlot = findDir(node, 'slot', true)
if (explicitDefaultSlot) {
const { arg, exp, loc } = explicitDefaultSlot
if (arg) {
@@ -73,7 +106,7 @@ export function buildSlots(
createCompilerError(ErrorCodes.X_NAMED_SLOT_ON_COMPONENT, loc)
)
}
slots.push(buildDefaultSlot(exp, children, loc))
slotsProperties.push(buildDefaultSlot(exp, children, loc))
}
// 2. Iterate through children and check for template slots
@@ -86,12 +119,13 @@ export function buildSlots(
let slotDir
if (
slotElement.type !== NodeTypes.ELEMENT ||
slotElement.tagType !== ElementTypes.TEMPLATE ||
!(slotDir = slotElement.props.find(isVSlot))
!isTemplateNode(slotElement) ||
!(slotDir = findDir(slotElement, 'slot', true))
) {
// not a <template v-slot>, skip.
extraneousChild = extraneousChild || slotElement
if (slotElement.type !== NodeTypes.COMMENT && !extraneousChild) {
extraneousChild = slotElement
}
continue
}
@@ -126,76 +160,78 @@ export function buildSlots(
slotChildren.length ? slotChildren[0].loc : slotLoc
)
// check if this slot is conditional (v-if/else/else-if)
// 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
slots.push(
createObjectProperty(
slotName,
createConditionalExpression(vIf.exp!, slotFunction, defaultFallback)
dynamicSlots.push(
createConditionalExpression(
vIf.exp!,
buildDynamicSlot(slotName, slotFunction),
defaultFallback
)
)
} else if (
(vElse = findDir(slotElement, /^else(-if)?$/, true /* allow empty */))
(vElse = findDir(slotElement, /^else(-if)?$/, true /* allowEmpty */))
) {
hasDynamicSlots = true
// find adjacent v-if slot
let baseIfSlot: Property | undefined
let baseIfSlotWithSameName: Property | undefined
let i = slots.length
while (i--) {
if (slots[i].value.type === NodeTypes.JS_CONDITIONAL_EXPRESSION) {
baseIfSlot = slots[i]
if (staticSlotName && hasSameName(baseIfSlot, staticSlotName)) {
baseIfSlotWithSameName = baseIfSlot
break
}
// find adjacent v-if
let j = i
let prev
while (j--) {
prev = children[j]
if (prev.type !== NodeTypes.COMMENT) {
break
}
}
if (!baseIfSlot) {
context.onError(
createCompilerError(ErrorCodes.X_ELSE_NO_ADJACENT_IF, vElse.loc)
)
continue
}
if (baseIfSlotWithSameName) {
// v-else branch has same slot name with base v-if branch
let conditional = baseIfSlotWithSameName.value as ConditionalExpression
// locate the deepest conditional in case we have nested ones
if (prev && isTemplateNode(prev) && findDir(prev, 'if')) {
// remove node
children.splice(i, 1)
i--
__DEV__ && 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
}
// attach the v-else branch to the base v-if's conditional expression
conditional.alternate = vElse.exp
? createConditionalExpression(
vElse.exp,
slotFunction,
buildDynamicSlot(slotName, slotFunction),
defaultFallback
)
: slotFunction
: buildDynamicSlot(slotName, slotFunction)
} else {
// not the same slot name. generate a separate property.
slots.push(
createObjectProperty(
slotName,
createConditionalExpression(
// negate base branch condition
mergeExpressions(
`!(`,
(baseIfSlot.value as ConditionalExpression).test,
`)`,
...(vElse.exp ? [` && (`, vElse.exp, `)`] : [])
),
slotFunction,
defaultFallback
context.onError(
createCompilerError(ErrorCodes.X_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
)
)
])
)
} else {
context.onError(
createCompilerError(ErrorCodes.X_FOR_MALFORMED_EXPRESSION, vFor.loc)
)
}
} else {
@@ -209,7 +245,7 @@ export function buildSlots(
}
seenSlotNames.add(staticSlotName)
}
slots.push(createObjectProperty(slotName, slotFunction))
slotsProperties.push(createObjectProperty(slotName, slotFunction))
}
}
@@ -224,11 +260,22 @@ export function buildSlots(
if (!explicitDefaultSlot && !hasTemplateSlots) {
// implicit default slot.
slots.push(buildDefaultSlot(undefined, children, loc))
slotsProperties.push(buildDefaultSlot(undefined, children, loc))
}
let slots: ObjectExpression | CallExpression = createObjectExpression(
slotsProperties,
loc
)
if (dynamicSlots.length) {
slots = createCallExpression(context.helper(CREATE_SLOTS), [
slots,
createArrayExpression(dynamicSlots)
])
}
return {
slots: createObjectExpression(slots, loc),
slots,
hasDynamicSlots
}
}
@@ -239,7 +286,7 @@ function buildDefaultSlot(
loc: SourceLocation
): Property {
return createObjectProperty(
createSimpleExpression(`default`, true),
`default`,
createFunctionExpression(
slotProps,
children,
@@ -248,3 +295,13 @@ function buildDefaultSlot(
)
)
}
function buildDynamicSlot(
name: ExpressionNode,
fn: FunctionExpression
): ObjectExpression {
return createObjectExpression([
createObjectProperty(`name`, name),
createObjectProperty(`fn`, fn)
])
}