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type CacheExpression,
type CallExpression,
type ComponentNode,
ConstantTypes,
ElementTypes,
type ExpressionNode,
type JSChildNode,
NodeTypes,
type ParentNode,
type PlainElementNode,
type RootNode,
type SimpleExpressionNode,
type SlotFunctionExpression,
type TemplateChildNode,
type TemplateNode,
type TextCallNode,
type VNodeCall,
createArrayExpression,
getVNodeBlockHelper,
getVNodeHelper,
} from '../ast'
import type { TransformContext } from '../transform'
import {
PatchFlagNames,
PatchFlags,
isArray,
isString,
isSymbol,
} from '@vue/shared'
import { findDir, isSlotOutlet } from '../utils'
import {
GUARD_REACTIVE_PROPS,
NORMALIZE_CLASS,
NORMALIZE_PROPS,
NORMALIZE_STYLE,
OPEN_BLOCK,
} from '../runtimeHelpers'
export function cacheStatic(root: RootNode, context: TransformContext): void {
walk(
root,
undefined,
context,
// Root node is unfortunately non-hoistable due to potential parent
// fallthrough attributes.
!!getSingleElementRoot(root),
)
}
export function getSingleElementRoot(
root: RootNode,
): PlainElementNode | ComponentNode | TemplateNode | null {
const children = root.children.filter(x => x.type !== NodeTypes.COMMENT)
return children.length === 1 &&
children[0].type === NodeTypes.ELEMENT &&
!isSlotOutlet(children[0])
? children[0]
: null
}
function walk(
node: ParentNode,
parent: ParentNode | undefined,
context: TransformContext,
doNotHoistNode: boolean = false,
inFor = false,
) {
const { children } = node
const toCache: (PlainElementNode | TextCallNode)[] = []
for (let i = 0; i < children.length; i++) {
const child = children[i]
// only plain elements & text calls are eligible for caching.
if (
child.type === NodeTypes.ELEMENT &&
child.tagType === ElementTypes.ELEMENT
) {
const constantType = doNotHoistNode
? ConstantTypes.NOT_CONSTANT
: getConstantType(child, context)
if (constantType > ConstantTypes.NOT_CONSTANT) {
if (constantType >= ConstantTypes.CAN_CACHE) {
;(child.codegenNode as VNodeCall).patchFlag = PatchFlags.CACHED
toCache.push(child)
continue
}
} else {
// node may contain dynamic children, but its props may be eligible for
// hoisting.
const codegenNode = child.codegenNode!
if (codegenNode.type === NodeTypes.VNODE_CALL) {
const flag = codegenNode.patchFlag
if (
(flag === undefined ||
flag === PatchFlags.NEED_PATCH ||
flag === PatchFlags.TEXT) &&
getGeneratedPropsConstantType(child, context) >=
ConstantTypes.CAN_CACHE
) {
const props = getNodeProps(child)
if (props) {
codegenNode.props = context.hoist(props)
}
}
if (codegenNode.dynamicProps) {
codegenNode.dynamicProps = context.hoist(codegenNode.dynamicProps)
}
}
}
} else if (child.type === NodeTypes.TEXT_CALL) {
const constantType = doNotHoistNode
? ConstantTypes.NOT_CONSTANT
: getConstantType(child, context)
if (constantType >= ConstantTypes.CAN_CACHE) {
if (
child.codegenNode.type === NodeTypes.JS_CALL_EXPRESSION &&
child.codegenNode.arguments.length > 0
) {
child.codegenNode.arguments.push(
PatchFlags.CACHED +
(__DEV__ ? ` /* ${PatchFlagNames[PatchFlags.CACHED]} */` : ``),
)
}
toCache.push(child)
continue
}
}
// walk further
if (child.type === NodeTypes.ELEMENT) {
const isComponent = child.tagType === ElementTypes.COMPONENT
if (isComponent) {
context.scopes.vSlot++
}
walk(child, node, context, false, inFor)
if (isComponent) {
context.scopes.vSlot--
}
} else if (child.type === NodeTypes.FOR) {
// Do not hoist v-for single child because it has to be a block
walk(child, node, context, child.children.length === 1, true)
} else if (child.type === NodeTypes.IF) {
for (let i = 0; i < child.branches.length; i++) {
// Do not hoist v-if single child because it has to be a block
walk(
child.branches[i],
node,
context,
child.branches[i].children.length === 1,
inFor,
)
}
}
}
let cachedAsArray = false
if (toCache.length === children.length && node.type === NodeTypes.ELEMENT) {
if (
node.tagType === ElementTypes.ELEMENT &&
node.codegenNode &&
node.codegenNode.type === NodeTypes.VNODE_CALL &&
isArray(node.codegenNode.children)
) {
// all children were hoisted - the entire children array is cacheable.
node.codegenNode.children = getCacheExpression(
createArrayExpression(node.codegenNode.children),
)
cachedAsArray = true
} else if (
node.tagType === ElementTypes.COMPONENT &&
node.codegenNode &&
node.codegenNode.type === NodeTypes.VNODE_CALL &&
node.codegenNode.children &&
!isArray(node.codegenNode.children) &&
node.codegenNode.children.type === NodeTypes.JS_OBJECT_EXPRESSION
) {
// default slot
const slot = getSlotNode(node.codegenNode, 'default')
if (slot) {
slot.returns = getCacheExpression(
createArrayExpression(slot.returns as TemplateChildNode[]),
)
cachedAsArray = true
}
} else if (
node.tagType === ElementTypes.TEMPLATE &&
parent &&
parent.type === NodeTypes.ELEMENT &&
parent.tagType === ElementTypes.COMPONENT &&
parent.codegenNode &&
parent.codegenNode.type === NodeTypes.VNODE_CALL &&
parent.codegenNode.children &&
!isArray(parent.codegenNode.children) &&
parent.codegenNode.children.type === NodeTypes.JS_OBJECT_EXPRESSION
) {
// named <template> slot
const slotName = findDir(node, 'slot', true)
const slot =
slotName &&
slotName.arg &&
getSlotNode(parent.codegenNode, slotName.arg)
if (slot) {
slot.returns = getCacheExpression(
createArrayExpression(slot.returns as TemplateChildNode[]),
)
cachedAsArray = true
}
}
}
if (!cachedAsArray) {
for (const child of toCache) {
child.codegenNode = context.cache(child.codegenNode!)
}
}
function getCacheExpression(value: JSChildNode): CacheExpression {
const exp = context.cache(value)
// #6978, #7138, #7114
// a cached children array inside v-for can caused HMR errors since
// it might be mutated when mounting the first item
// #13221
// fix memory leak in cached array:
// cached vnodes get replaced by cloned ones during mountChildren,
// which bind DOM elements. These DOM references persist after unmount,
// preventing garbage collection. Array spread avoids mutating cached
// array, preventing memory leaks.
exp.needArraySpread = true
return exp
}
function getSlotNode(
node: VNodeCall,
name: string | ExpressionNode,
): SlotFunctionExpression | undefined {
if (
node.children &&
!isArray(node.children) &&
node.children.type === NodeTypes.JS_OBJECT_EXPRESSION
) {
const slot = node.children.properties.find(
p => p.key === name || (p.key as SimpleExpressionNode).content === name,
)
return slot && slot.value
}
}
if (toCache.length && context.transformHoist) {
context.transformHoist(children, context, node)
}
}
export function getConstantType(
node: TemplateChildNode | SimpleExpressionNode | CacheExpression,
context: TransformContext,
): ConstantTypes {
const { constantCache } = context
switch (node.type) {
case NodeTypes.ELEMENT:
if (node.tagType !== ElementTypes.ELEMENT) {
return ConstantTypes.NOT_CONSTANT
}
const cached = constantCache.get(node)
if (cached !== undefined) {
return cached
}
const codegenNode = node.codegenNode!
if (codegenNode.type !== NodeTypes.VNODE_CALL) {
return ConstantTypes.NOT_CONSTANT
}
if (
codegenNode.isBlock &&
node.tag !== 'svg' &&
node.tag !== 'foreignObject' &&
node.tag !== 'math'
) {
return ConstantTypes.NOT_CONSTANT
}
if (codegenNode.patchFlag === undefined) {
let returnType = ConstantTypes.CAN_STRINGIFY
// Element itself has no patch flag. However we still need to check:
// 1. Even for a node with no patch flag, it is possible for it to contain
// non-hoistable expressions that refers to scope variables, e.g. compiler
// injected keys or cached event handlers. Therefore we need to always
// check the codegenNode's props to be sure.
const generatedPropsType = getGeneratedPropsConstantType(node, context)
if (generatedPropsType === ConstantTypes.NOT_CONSTANT) {
constantCache.set(node, ConstantTypes.NOT_CONSTANT)
return ConstantTypes.NOT_CONSTANT
}
if (generatedPropsType < returnType) {
returnType = generatedPropsType
}
// 2. its children.
for (let i = 0; i < node.children.length; i++) {
const childType = getConstantType(node.children[i], context)
if (childType === ConstantTypes.NOT_CONSTANT) {
constantCache.set(node, ConstantTypes.NOT_CONSTANT)
return ConstantTypes.NOT_CONSTANT
}
if (childType < returnType) {
returnType = childType
}
}
// 3. if the type is not already CAN_SKIP_PATCH which is the lowest non-0
// type, check if any of the props can cause the type to be lowered
// we can skip can_patch because it's guaranteed by the absence of a
// patchFlag.
if (returnType > ConstantTypes.CAN_SKIP_PATCH) {
for (let i = 0; i < node.props.length; i++) {
const p = node.props[i]
if (p.type === NodeTypes.DIRECTIVE && p.name === 'bind' && p.exp) {
const expType = getConstantType(p.exp, context)
if (expType === ConstantTypes.NOT_CONSTANT) {
constantCache.set(node, ConstantTypes.NOT_CONSTANT)
return ConstantTypes.NOT_CONSTANT
}
if (expType < returnType) {
returnType = expType
}
}
}
}
// only svg/foreignObject could be block here, however if they are
// static then they don't need to be blocks since there will be no
// nested updates.
if (codegenNode.isBlock) {
// except set custom directives.
for (let i = 0; i < node.props.length; i++) {
const p = node.props[i]
if (p.type === NodeTypes.DIRECTIVE) {
constantCache.set(node, ConstantTypes.NOT_CONSTANT)
return ConstantTypes.NOT_CONSTANT
}
}
context.removeHelper(OPEN_BLOCK)
context.removeHelper(
getVNodeBlockHelper(context.inSSR, codegenNode.isComponent),
)
codegenNode.isBlock = false
context.helper(getVNodeHelper(context.inSSR, codegenNode.isComponent))
}
constantCache.set(node, returnType)
return returnType
} else {
constantCache.set(node, ConstantTypes.NOT_CONSTANT)
return ConstantTypes.NOT_CONSTANT
}
case NodeTypes.TEXT:
case NodeTypes.COMMENT:
return ConstantTypes.CAN_STRINGIFY
case NodeTypes.IF:
case NodeTypes.FOR:
case NodeTypes.IF_BRANCH:
return ConstantTypes.NOT_CONSTANT
case NodeTypes.INTERPOLATION:
case NodeTypes.TEXT_CALL:
return getConstantType(node.content, context)
case NodeTypes.SIMPLE_EXPRESSION:
return node.constType
case NodeTypes.COMPOUND_EXPRESSION:
let returnType = ConstantTypes.CAN_STRINGIFY
for (let i = 0; i < node.children.length; i++) {
const child = node.children[i]
if (isString(child) || isSymbol(child)) {
continue
}
const childType = getConstantType(child, context)
if (childType === ConstantTypes.NOT_CONSTANT) {
return ConstantTypes.NOT_CONSTANT
} else if (childType < returnType) {
returnType = childType
}
}
return returnType
case NodeTypes.JS_CACHE_EXPRESSION:
return ConstantTypes.CAN_CACHE
default:
if (__DEV__) {
const exhaustiveCheck: never = node
exhaustiveCheck
}
return ConstantTypes.NOT_CONSTANT
}
}
const allowHoistedHelperSet = new Set([
NORMALIZE_CLASS,
NORMALIZE_STYLE,
NORMALIZE_PROPS,
GUARD_REACTIVE_PROPS,
])
function getConstantTypeOfHelperCall(
value: CallExpression,
context: TransformContext,
): ConstantTypes {
if (
value.type === NodeTypes.JS_CALL_EXPRESSION &&
!isString(value.callee) &&
allowHoistedHelperSet.has(value.callee)
) {
const arg = value.arguments[0] as JSChildNode
if (arg.type === NodeTypes.SIMPLE_EXPRESSION) {
return getConstantType(arg, context)
} else if (arg.type === NodeTypes.JS_CALL_EXPRESSION) {
// in the case of nested helper call, e.g. `normalizeProps(guardReactiveProps(exp))`
return getConstantTypeOfHelperCall(arg, context)
}
}
return ConstantTypes.NOT_CONSTANT
}
function getGeneratedPropsConstantType(
node: PlainElementNode,
context: TransformContext,
): ConstantTypes {
let returnType = ConstantTypes.CAN_STRINGIFY
const props = getNodeProps(node)
if (props && props.type === NodeTypes.JS_OBJECT_EXPRESSION) {
const { properties } = props
for (let i = 0; i < properties.length; i++) {
const { key, value } = properties[i]
const keyType = getConstantType(key, context)
if (keyType === ConstantTypes.NOT_CONSTANT) {
return keyType
}
if (keyType < returnType) {
returnType = keyType
}
let valueType: ConstantTypes
if (value.type === NodeTypes.SIMPLE_EXPRESSION) {
valueType = getConstantType(value, context)
} else if (value.type === NodeTypes.JS_CALL_EXPRESSION) {
// some helper calls can be hoisted,
// such as the `normalizeProps` generated by the compiler for pre-normalize class,
// in this case we need to respect the ConstantType of the helper's arguments
valueType = getConstantTypeOfHelperCall(value, context)
} else {
valueType = ConstantTypes.NOT_CONSTANT
}
if (valueType === ConstantTypes.NOT_CONSTANT) {
return valueType
}
if (valueType < returnType) {
returnType = valueType
}
}
}
return returnType
}
function getNodeProps(node: PlainElementNode) {
const codegenNode = node.codegenNode!
if (codegenNode.type === NodeTypes.VNODE_CALL) {
return codegenNode.props
}
}
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