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import {
type ArrayExpression,
type CallExpression,
type ComponentNode,
ConstantTypes,
type DirectiveArguments,
type DirectiveNode,
type ElementNode,
ElementTypes,
type ExpressionNode,
type JSChildNode,
NodeTypes,
type ObjectExpression,
type Property,
type TemplateTextChildNode,
type VNodeCall,
createArrayExpression,
createCallExpression,
createObjectExpression,
createObjectProperty,
createSimpleExpression,
createVNodeCall,
} from '../ast'
import {
PatchFlags,
camelize,
capitalize,
isBuiltInDirective,
isObject,
isOn,
isReservedProp,
isSymbol,
} from '@vue/shared'
import { ErrorCodes, createCompilerError } from '../errors'
import {
GUARD_REACTIVE_PROPS,
KEEP_ALIVE,
MERGE_PROPS,
NORMALIZE_CLASS,
NORMALIZE_PROPS,
NORMALIZE_STYLE,
RESOLVE_COMPONENT,
RESOLVE_DIRECTIVE,
RESOLVE_DYNAMIC_COMPONENT,
SUSPENSE,
TELEPORT,
TO_HANDLERS,
UNREF,
} from '../runtimeHelpers'
import {
findProp,
isCoreComponent,
isStaticArgOf,
isStaticExp,
toValidAssetId,
} from '../utils'
import { buildSlots } from './vSlot'
import { getConstantType } from './cacheStatic'
import { BindingTypes } from '../options'
import {
CompilerDeprecationTypes,
checkCompatEnabled,
isCompatEnabled,
} from '../compat/compatConfig'
import { processExpression } from './transformExpression'
// some directive transforms (e.g. v-model) may return a symbol for runtime
// import, which should be used instead of a resolveDirective call.
const directiveImportMap = new WeakMap<DirectiveNode, symbol>()
// generate a JavaScript AST for this element's codegen
export const transformElement: NodeTransform = (node, context) => {
// perform the work on exit, after all child expressions have been
// processed and merged.
return function postTransformElement() {
node = context.currentNode!
if (
!(
node.type === NodeTypes.ELEMENT &&
(node.tagType === ElementTypes.ELEMENT ||
node.tagType === ElementTypes.COMPONENT)
)
) {
return
}
const { tag, props } = node
const isComponent = node.tagType === ElementTypes.COMPONENT
// The goal of the transform is to create a codegenNode implementing the
// VNodeCall interface.
let vnodeTag = isComponent
? resolveComponentType(node as ComponentNode, context)
: `"${tag}"`
const isDynamicComponent =
isObject(vnodeTag) && vnodeTag.callee === RESOLVE_DYNAMIC_COMPONENT
let vnodeProps: VNodeCall['props']
let vnodeChildren: VNodeCall['children']
let patchFlag: VNodeCall['patchFlag'] | 0 = 0
let vnodeDynamicProps: VNodeCall['dynamicProps']
let dynamicPropNames: string[] | undefined
let vnodeDirectives: VNodeCall['directives']
let shouldUseBlock =
// dynamic component may resolve to plain elements
isDynamicComponent ||
vnodeTag === TELEPORT ||
vnodeTag === SUSPENSE ||
(!isComponent &&
// <svg> and <foreignObject> must be forced into blocks so that block
// updates inside get proper isSVG flag at runtime. (#639, #643)
// This is technically web-specific, but splitting the logic out of core
// leads to too much unnecessary complexity.
(tag === 'svg' || tag === 'foreignObject' || tag === 'math'))
// props
if (props.length > 0) {
const propsBuildResult = buildProps(
node,
context,
undefined,
isComponent,
isDynamicComponent,
)
vnodeProps = propsBuildResult.props
patchFlag = propsBuildResult.patchFlag
dynamicPropNames = propsBuildResult.dynamicPropNames
const directives = propsBuildResult.directives
vnodeDirectives =
directives && directives.length
? (createArrayExpression(
directives.map(dir => buildDirectiveArgs(dir, context)),
) as DirectiveArguments)
: undefined
if (propsBuildResult.shouldUseBlock) {
shouldUseBlock = true
}
}
// children
if (node.children.length > 0) {
if (vnodeTag === KEEP_ALIVE) {
// Although a built-in component, we compile KeepAlive with raw children
// instead of slot functions so that it can be used inside Transition
// or other Transition-wrapping HOCs.
// To ensure correct updates with block optimizations, we need to:
// 1. Force keep-alive into a block. This avoids its children being
// collected by a parent block.
shouldUseBlock = true
// 2. Force keep-alive to always be updated, since it uses raw children.
patchFlag |= PatchFlags.DYNAMIC_SLOTS
if (__DEV__ && node.children.length > 1) {
context.onError(
createCompilerError(ErrorCodes.X_KEEP_ALIVE_INVALID_CHILDREN, {
start: node.children[0].loc.start,
end: node.children[node.children.length - 1].loc.end,
source: '',
}),
)
}
}
const shouldBuildAsSlots =
isComponent &&
// Teleport is not a real component and has dedicated runtime handling
vnodeTag !== TELEPORT &&
// explained above.
vnodeTag !== KEEP_ALIVE
if (shouldBuildAsSlots) {
const { slots, hasDynamicSlots } = buildSlots(node, context)
vnodeChildren = slots
if (hasDynamicSlots) {
patchFlag |= PatchFlags.DYNAMIC_SLOTS
}
} else if (node.children.length === 1 && vnodeTag !== TELEPORT) {
const child = node.children[0]
const type = child.type
// check for dynamic text children
const hasDynamicTextChild =
type === NodeTypes.INTERPOLATION ||
type === NodeTypes.COMPOUND_EXPRESSION
if (
hasDynamicTextChild &&
getConstantType(child, context) === ConstantTypes.NOT_CONSTANT
) {
patchFlag |= PatchFlags.TEXT
}
// pass directly if the only child is a text node
// (plain / interpolation / expression)
if (hasDynamicTextChild || type === NodeTypes.TEXT) {
vnodeChildren = child as TemplateTextChildNode
} else {
vnodeChildren = node.children
}
} else {
vnodeChildren = node.children
}
}
// patchFlag & dynamicPropNames
if (dynamicPropNames && dynamicPropNames.length) {
vnodeDynamicProps = stringifyDynamicPropNames(dynamicPropNames)
}
node.codegenNode = createVNodeCall(
context,
vnodeTag,
vnodeProps,
vnodeChildren,
patchFlag === 0 ? undefined : patchFlag,
vnodeDynamicProps,
vnodeDirectives,
!!shouldUseBlock,
false /* disableTracking */,
isComponent,
node.loc,
)
}
}
export function resolveComponentType(
node: ComponentNode,
context: TransformContext,
ssr = false,
): string | symbol | CallExpression {
let { tag } = node
// 1. dynamic component
const isExplicitDynamic = isComponentTag(tag)
const isProp = findProp(node, 'is', false, true /* allow empty */)
if (isProp) {
if (
isExplicitDynamic ||
(__COMPAT__ &&
isCompatEnabled(
CompilerDeprecationTypes.COMPILER_IS_ON_ELEMENT,
context,
))
) {
let exp: ExpressionNode | undefined
if (isProp.type === NodeTypes.ATTRIBUTE) {
exp = isProp.value && createSimpleExpression(isProp.value.content, true)
} else {
exp = isProp.exp
if (!exp) {
// #10469 handle :is shorthand
exp = createSimpleExpression(`is`, false, isProp.arg!.loc)
if (!__BROWSER__) {
exp = isProp.exp = processExpression(exp, context)
}
}
}
if (exp) {
return createCallExpression(context.helper(RESOLVE_DYNAMIC_COMPONENT), [
exp,
])
}
} else if (
isProp.type === NodeTypes.ATTRIBUTE &&
isProp.value!.content.startsWith('vue:')
) {
// <button is="vue:xxx">
// if not <component>, only is value that starts with "vue:" will be
// treated as component by the parse phase and reach here, unless it's
// compat mode where all is values are considered components
tag = isProp.value!.content.slice(4)
}
}
// 2. built-in components (Teleport, Transition, KeepAlive, Suspense...)
const builtIn = isCoreComponent(tag) || context.isBuiltInComponent(tag)
if (builtIn) {
// built-ins are simply fallthroughs / have special handling during ssr
// so we don't need to import their runtime equivalents
if (!ssr) context.helper(builtIn)
return builtIn
}
// 3. user component (from setup bindings)
// this is skipped in browser build since browser builds do not perform
// binding analysis.
if (!__BROWSER__) {
const fromSetup = resolveSetupReference(tag, context)
if (fromSetup) {
return fromSetup
}
const dotIndex = tag.indexOf('.')
if (dotIndex > 0) {
const ns = resolveSetupReference(tag.slice(0, dotIndex), context)
if (ns) {
return ns + tag.slice(dotIndex)
}
}
}
// 4. Self referencing component (inferred from filename)
if (
!__BROWSER__ &&
context.selfName &&
capitalize(camelize(tag)) === context.selfName
) {
context.helper(RESOLVE_COMPONENT)
// codegen.ts has special check for __self postfix when generating
// component imports, which will pass additional `maybeSelfReference` flag
// to `resolveComponent`.
context.components.add(tag + `__self`)
return toValidAssetId(tag, `component`)
}
// 5. user component (resolve)
context.helper(RESOLVE_COMPONENT)
context.components.add(tag)
return toValidAssetId(tag, `component`)
}
function resolveSetupReference(name: string, context: TransformContext) {
const bindings = context.bindingMetadata
if (!bindings || bindings.__isScriptSetup === false) {
return
}
const camelName = camelize(name)
const PascalName = capitalize(camelName)
const checkType = (type: BindingTypes) => {
if (bindings[name] === type) {
return name
}
if (bindings[camelName] === type) {
return camelName
}
if (bindings[PascalName] === type) {
return PascalName
}
}
const fromConst =
checkType(BindingTypes.SETUP_CONST) ||
checkType(BindingTypes.SETUP_REACTIVE_CONST) ||
checkType(BindingTypes.LITERAL_CONST)
if (fromConst) {
return context.inline
? // in inline mode, const setup bindings (e.g. imports) can be used as-is
fromConst
: `$setup[${JSON.stringify(fromConst)}]`
}
const fromMaybeRef =
checkType(BindingTypes.SETUP_LET) ||
checkType(BindingTypes.SETUP_REF) ||
checkType(BindingTypes.SETUP_MAYBE_REF)
if (fromMaybeRef) {
return context.inline
? // setup scope bindings that may be refs need to be unrefed
`${context.helperString(UNREF)}(${fromMaybeRef})`
: `$setup[${JSON.stringify(fromMaybeRef)}]`
}
const fromProps = checkType(BindingTypes.PROPS)
if (fromProps) {
return `${context.helperString(UNREF)}(${
context.inline ? '__props' : '$props'
}[${JSON.stringify(fromProps)}])`
}
}
export type PropsExpression = ObjectExpression | CallExpression | ExpressionNode
export function buildProps(
node: ElementNode,
context: TransformContext,
props: ElementNode['props'] | undefined = node.props,
isComponent: boolean,
isDynamicComponent: boolean,
ssr = false,
): {
props: PropsExpression | undefined
directives: DirectiveNode[]
patchFlag: number
dynamicPropNames: string[]
shouldUseBlock: boolean
} {
const { tag, loc: elementLoc, children } = node
let properties: ObjectExpression['properties'] = []
const mergeArgs: PropsExpression[] = []
const runtimeDirectives: DirectiveNode[] = []
const hasChildren = children.length > 0
let shouldUseBlock = false
// patchFlag analysis
let patchFlag = 0
let hasRef = false
let hasClassBinding = false
let hasStyleBinding = false
let hasHydrationEventBinding = false
let hasDynamicKeys = false
let hasVnodeHook = false
const dynamicPropNames: string[] = []
const pushMergeArg = (arg?: PropsExpression) => {
if (properties.length) {
mergeArgs.push(
createObjectExpression(dedupeProperties(properties), elementLoc),
)
properties = []
}
if (arg) mergeArgs.push(arg)
}
// mark template ref on v-for
const pushRefVForMarker = () => {
if (context.scopes.vFor > 0) {
properties.push(
createObjectProperty(
createSimpleExpression('ref_for', true),
createSimpleExpression('true'),
),
)
}
}
const analyzePatchFlag = ({ key, value }: Property) => {
if (isStaticExp(key)) {
const name = key.content
const isEventHandler = isOn(name)
if (
isEventHandler &&
(!isComponent || isDynamicComponent) &&
// omit the flag for click handlers because hydration gives click
// dedicated fast path.
name.toLowerCase() !== 'onclick' &&
// omit v-model handlers
name !== 'onUpdate:modelValue' &&
// omit onVnodeXXX hooks
!isReservedProp(name)
) {
hasHydrationEventBinding = true
}
if (isEventHandler && isReservedProp(name)) {
hasVnodeHook = true
}
if (isEventHandler && value.type === NodeTypes.JS_CALL_EXPRESSION) {
// handler wrapped with internal helper e.g. withModifiers(fn)
// extract the actual expression
value = value.arguments[0] as JSChildNode
}
if (
value.type === NodeTypes.JS_CACHE_EXPRESSION ||
((value.type === NodeTypes.SIMPLE_EXPRESSION ||
value.type === NodeTypes.COMPOUND_EXPRESSION) &&
getConstantType(value, context) > 0)
) {
// skip if the prop is a cached handler or has constant value
return
}
if (name === 'ref') {
hasRef = true
} else if (name === 'class') {
hasClassBinding = true
} else if (name === 'style') {
hasStyleBinding = true
} else if (name !== 'key' && !dynamicPropNames.includes(name)) {
dynamicPropNames.push(name)
}
// treat the dynamic class and style binding of the component as dynamic props
if (
isComponent &&
(name === 'class' || name === 'style') &&
!dynamicPropNames.includes(name)
) {
dynamicPropNames.push(name)
}
} else {
hasDynamicKeys = true
}
}
for (let i = 0; i < props.length; i++) {
// static attribute
const prop = props[i]
if (prop.type === NodeTypes.ATTRIBUTE) {
const { loc, name, nameLoc, value } = prop
let isStatic = true
if (name === 'ref') {
hasRef = true
pushRefVForMarker()
// in inline mode there is no setupState object, so we can't use string
// keys to set the ref. Instead, we need to transform it to pass the
// actual ref instead.
if (!__BROWSER__ && value && context.inline) {
const binding = context.bindingMetadata[value.content]
if (
binding === BindingTypes.SETUP_LET ||
binding === BindingTypes.SETUP_REF ||
binding === BindingTypes.SETUP_MAYBE_REF
) {
isStatic = false
properties.push(
createObjectProperty(
createSimpleExpression('ref_key', true),
createSimpleExpression(value.content, true, value.loc),
),
)
}
}
}
// skip is on <component>, or is="vue:xxx"
if (
name === 'is' &&
(isComponentTag(tag) ||
(value && value.content.startsWith('vue:')) ||
(__COMPAT__ &&
isCompatEnabled(
CompilerDeprecationTypes.COMPILER_IS_ON_ELEMENT,
context,
)))
) {
continue
}
properties.push(
createObjectProperty(
createSimpleExpression(name, true, nameLoc),
createSimpleExpression(
value ? value.content : '',
isStatic,
value ? value.loc : loc,
),
),
)
} else {
// directives
const { name, arg, exp, loc, modifiers } = prop
const isVBind = name === 'bind'
const isVOn = name === 'on'
// skip v-slot - it is handled by its dedicated transform.
if (name === 'slot') {
if (!isComponent) {
context.onError(
createCompilerError(ErrorCodes.X_V_SLOT_MISPLACED, loc),
)
}
continue
}
// skip v-once/v-memo - they are handled by dedicated transforms.
if (name === 'once' || name === 'memo') {
continue
}
// skip v-is and :is on <component>
if (
name === 'is' ||
(isVBind &&
isStaticArgOf(arg, 'is') &&
(isComponentTag(tag) ||
(__COMPAT__ &&
isCompatEnabled(
CompilerDeprecationTypes.COMPILER_IS_ON_ELEMENT,
context,
))))
) {
continue
}
// skip v-on in SSR compilation
if (isVOn && ssr) {
continue
}
if (
// #938: elements with dynamic keys should be forced into blocks
(isVBind && isStaticArgOf(arg, 'key')) ||
// inline before-update hooks need to force block so that it is invoked
// before children
(isVOn && hasChildren && isStaticArgOf(arg, 'vue:before-update'))
) {
shouldUseBlock = true
}
if (isVBind && isStaticArgOf(arg, 'ref')) {
pushRefVForMarker()
}
// special case for v-bind and v-on with no argument
if (!arg && (isVBind || isVOn)) {
hasDynamicKeys = true
if (exp) {
if (isVBind) {
if (__COMPAT__) {
// have to merge early for compat build check
pushMergeArg()
// 2.x v-bind object order compat
if (__DEV__) {
const hasOverridableKeys = mergeArgs.some(arg => {
if (arg.type === NodeTypes.JS_OBJECT_EXPRESSION) {
return arg.properties.some(({ key }) => {
if (
key.type !== NodeTypes.SIMPLE_EXPRESSION ||
!key.isStatic
) {
return true
}
return (
key.content !== 'class' &&
key.content !== 'style' &&
!isOn(key.content)
)
})
} else {
// dynamic expression
return true
}
})
if (hasOverridableKeys) {
checkCompatEnabled(
CompilerDeprecationTypes.COMPILER_V_BIND_OBJECT_ORDER,
context,
loc,
)
}
}
if (
isCompatEnabled(
CompilerDeprecationTypes.COMPILER_V_BIND_OBJECT_ORDER,
context,
)
) {
mergeArgs.unshift(exp)
continue
}
}
// #10696 in case a v-bind object contains ref
pushRefVForMarker()
pushMergeArg()
mergeArgs.push(exp)
} else {
// v-on="obj" -> toHandlers(obj)
pushMergeArg({
type: NodeTypes.JS_CALL_EXPRESSION,
loc,
callee: context.helper(TO_HANDLERS),
arguments: isComponent ? [exp] : [exp, `true`],
})
}
} else {
context.onError(
createCompilerError(
isVBind
? ErrorCodes.X_V_BIND_NO_EXPRESSION
: ErrorCodes.X_V_ON_NO_EXPRESSION,
loc,
),
)
}
continue
}
// force hydration for v-bind with .prop modifier
if (isVBind && modifiers.some(mod => mod.content === 'prop')) {
patchFlag |= PatchFlags.NEED_HYDRATION
}
const directiveTransform = context.directiveTransforms[name]
if (directiveTransform) {
// has built-in directive transform.
const { props, needRuntime } = directiveTransform(prop, node, context)
!ssr && props.forEach(analyzePatchFlag)
if (isVOn && arg && !isStaticExp(arg)) {
pushMergeArg(createObjectExpression(props, elementLoc))
} else {
properties.push(...props)
}
if (needRuntime) {
runtimeDirectives.push(prop)
if (isSymbol(needRuntime)) {
directiveImportMap.set(prop, needRuntime)
}
}
} else if (!isBuiltInDirective(name)) {
// no built-in transform, this is a user custom directive.
runtimeDirectives.push(prop)
// custom dirs may use beforeUpdate so they need to force blocks
// to ensure before-update gets called before children update
if (hasChildren) {
shouldUseBlock = true
}
}
}
}
let propsExpression: PropsExpression | undefined = undefined
// has v-bind="object" or v-on="object", wrap with mergeProps
if (mergeArgs.length) {
// close up any not-yet-merged props
pushMergeArg()
if (mergeArgs.length > 1) {
propsExpression = createCallExpression(
context.helper(MERGE_PROPS),
mergeArgs,
elementLoc,
)
} else {
// single v-bind with nothing else - no need for a mergeProps call
propsExpression = mergeArgs[0]
}
} else if (properties.length) {
propsExpression = createObjectExpression(
dedupeProperties(properties),
elementLoc,
)
}
// patchFlag analysis
if (hasDynamicKeys) {
patchFlag |= PatchFlags.FULL_PROPS
} else {
if (hasClassBinding && !isComponent) {
patchFlag |= PatchFlags.CLASS
}
if (hasStyleBinding && !isComponent) {
patchFlag |= PatchFlags.STYLE
}
if (dynamicPropNames.length) {
patchFlag |= PatchFlags.PROPS
}
if (hasHydrationEventBinding) {
patchFlag |= PatchFlags.NEED_HYDRATION
}
}
if (
!shouldUseBlock &&
(patchFlag === 0 || patchFlag === PatchFlags.NEED_HYDRATION) &&
(hasRef || hasVnodeHook || runtimeDirectives.length > 0)
) {
patchFlag |= PatchFlags.NEED_PATCH
}
// pre-normalize props, SSR is skipped for now
if (!context.inSSR && propsExpression) {
switch (propsExpression.type) {
case NodeTypes.JS_OBJECT_EXPRESSION:
// means that there is no v-bind,
// but still need to deal with dynamic key binding
let classKeyIndex = -1
let styleKeyIndex = -1
let hasDynamicKey = false
for (let i = 0; i < propsExpression.properties.length; i++) {
const key = propsExpression.properties[i].key
if (isStaticExp(key)) {
if (key.content === 'class') {
classKeyIndex = i
} else if (key.content === 'style') {
styleKeyIndex = i
}
} else if (!key.isHandlerKey) {
hasDynamicKey = true
}
}
const classProp = propsExpression.properties[classKeyIndex]
const styleProp = propsExpression.properties[styleKeyIndex]
// no dynamic key
if (!hasDynamicKey) {
if (classProp && !isStaticExp(classProp.value)) {
classProp.value = createCallExpression(
context.helper(NORMALIZE_CLASS),
[classProp.value],
)
}
if (
styleProp &&
// the static style is compiled into an object,
// so use `hasStyleBinding` to ensure that it is a dynamic style binding
(hasStyleBinding ||
(styleProp.value.type === NodeTypes.SIMPLE_EXPRESSION &&
styleProp.value.content.trim()[0] === `[`) ||
// v-bind:style and style both exist,
// v-bind:style with static literal object
styleProp.value.type === NodeTypes.JS_ARRAY_EXPRESSION)
) {
styleProp.value = createCallExpression(
context.helper(NORMALIZE_STYLE),
[styleProp.value],
)
}
} else {
// dynamic key binding, wrap with `normalizeProps`
propsExpression = createCallExpression(
context.helper(NORMALIZE_PROPS),
[propsExpression],
)
}
break
case NodeTypes.JS_CALL_EXPRESSION:
// mergeProps call, do nothing
break
default:
// single v-bind
propsExpression = createCallExpression(
context.helper(NORMALIZE_PROPS),
[
createCallExpression(context.helper(GUARD_REACTIVE_PROPS), [
propsExpression,
]),
],
)
break
}
}
return {
props: propsExpression,
directives: runtimeDirectives,
patchFlag,
dynamicPropNames,
shouldUseBlock,
}
}
// Dedupe props in an object literal.
// Literal duplicated attributes would have been warned during the parse phase,
// however, it's possible to encounter duplicated `onXXX` handlers with different
// modifiers. We also need to merge static and dynamic class / style attributes.
// - onXXX handlers / style: merge into array
// - class: merge into single expression with concatenation
function dedupeProperties(properties: Property[]): Property[] {
const knownProps: Map<string, Property> = new Map()
const deduped: Property[] = []
for (let i = 0; i < properties.length; i++) {
const prop = properties[i]
// dynamic keys are always allowed
if (prop.key.type === NodeTypes.COMPOUND_EXPRESSION || !prop.key.isStatic) {
deduped.push(prop)
continue
}
const name = prop.key.content
const existing = knownProps.get(name)
if (existing) {
if (name === 'style' || name === 'class' || isOn(name)) {
mergeAsArray(existing, prop)
}
// unexpected duplicate, should have emitted error during parse
} else {
knownProps.set(name, prop)
deduped.push(prop)
}
}
return deduped
}
function mergeAsArray(existing: Property, incoming: Property) {
if (existing.value.type === NodeTypes.JS_ARRAY_EXPRESSION) {
existing.value.elements.push(incoming.value)
} else {
existing.value = createArrayExpression(
[existing.value, incoming.value],
existing.loc,
)
}
}
export function buildDirectiveArgs(
dir: DirectiveNode,
context: TransformContext,
): ArrayExpression {
const dirArgs: ArrayExpression['elements'] = []
const runtime = directiveImportMap.get(dir)
if (runtime) {
// built-in directive with runtime
dirArgs.push(context.helperString(runtime))
} else {
// user directive.
// see if we have directives exposed via <script setup>
const fromSetup =
!__BROWSER__ && resolveSetupReference('v-' + dir.name, context)
if (fromSetup) {
dirArgs.push(fromSetup)
} else {
// inject statement for resolving directive
context.helper(RESOLVE_DIRECTIVE)
context.directives.add(dir.name)
dirArgs.push(toValidAssetId(dir.name, `directive`))
}
}
const { loc } = dir
if (dir.exp) dirArgs.push(dir.exp)
if (dir.arg) {
if (!dir.exp) {
dirArgs.push(`void 0`)
}
dirArgs.push(dir.arg)
}
if (Object.keys(dir.modifiers).length) {
if (!dir.arg) {
if (!dir.exp) {
dirArgs.push(`void 0`)
}
dirArgs.push(`void 0`)
}
const trueExpression = createSimpleExpression(`true`, false, loc)
dirArgs.push(
createObjectExpression(
dir.modifiers.map(modifier =>
createObjectProperty(modifier, trueExpression),
),
loc,
),
)
}
return createArrayExpression(dirArgs, dir.loc)
}
function stringifyDynamicPropNames(props: string[]): string {
let propsNamesString = `[`
for (let i = 0, l = props.length; i < l; i++) {
propsNamesString += JSON.stringify(props[i])
if (i < l - 1) propsNamesString += ', '
}
return propsNamesString + `]`
}
function isComponentTag(tag: string) {
return tag === 'component' || tag === 'Component'
}
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