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// identifier gets more accurate source-map locations.
//
// - Prefix identifiers with `_ctx.` or `$xxx` (for known binding types) so that
// they are accessed from the right source
//
// - This transform is only applied in non-browser builds because it relies on
// an additional JavaScript parser. In the browser, there is no source-map
// support and the code is wrapped in `with (this) { ... }`.
import type { NodeTransform, TransformContext } from '../transform'
import {
type CompoundExpressionNode,
ConstantTypes,
type ExpressionNode,
NodeTypes,
type SimpleExpressionNode,
createCompoundExpression,
createSimpleExpression,
} from '../ast'
import {
isInDestructureAssignment,
isInNewExpression,
isStaticProperty,
isStaticPropertyKey,
walkIdentifiers,
} from '../babelUtils'
import { advancePositionWithClone, isSimpleIdentifier } from '../utils'
import {
genPropsAccessExp,
hasOwn,
isGloballyAllowed,
isString,
makeMap,
} from '@vue/shared'
import { ErrorCodes, createCompilerError } from '../errors'
import type {
AssignmentExpression,
Identifier,
Node,
UpdateExpression,
} from '@babel/types'
import { validateBrowserExpression } from '../validateExpression'
import { parseExpression } from '@babel/parser'
import { IS_REF, UNREF } from '../runtimeHelpers'
import { BindingTypes } from '../options'
const isLiteralWhitelisted = /*@__PURE__*/ makeMap('true,false,null,this')
export const transformExpression: NodeTransform = (node, context) => {
if (node.type === NodeTypes.INTERPOLATION) {
node.content = processExpression(
node.content as SimpleExpressionNode,
context,
)
} else if (node.type === NodeTypes.ELEMENT) {
// handle directives on element
for (let i = 0; i < node.props.length; i++) {
const dir = node.props[i]
// do not process for v-on & v-for since they are special handled
if (dir.type === NodeTypes.DIRECTIVE && dir.name !== 'for') {
const exp = dir.exp
const arg = dir.arg
// do not process exp if this is v-on:arg - we need special handling
// for wrapping inline statements.
if (
exp &&
exp.type === NodeTypes.SIMPLE_EXPRESSION &&
!(dir.name === 'on' && arg)
) {
dir.exp = processExpression(
exp,
context,
// slot args must be processed as function params
dir.name === 'slot',
)
}
if (arg && arg.type === NodeTypes.SIMPLE_EXPRESSION && !arg.isStatic) {
dir.arg = processExpression(arg, context)
}
}
}
}
}
interface PrefixMeta {
prefix?: string
isConstant: boolean
start: number
end: number
scopeIds?: Set<string>
}
// Important: since this function uses Node.js only dependencies, it should
// always be used with a leading !__BROWSER__ check so that it can be
// tree-shaken from the browser build.
export function processExpression(
node: SimpleExpressionNode,
context: TransformContext,
// some expressions like v-slot props & v-for aliases should be parsed as
// function params
asParams = false,
// v-on handler values may contain multiple statements
asRawStatements = false,
localVars: Record<string, number> = Object.create(context.identifiers),
): ExpressionNode {
if (__BROWSER__) {
if (__DEV__) {
// simple in-browser validation (same logic in 2.x)
validateBrowserExpression(node, context, asParams, asRawStatements)
}
return node
}
if (!context.prefixIdentifiers || !node.content.trim()) {
return node
}
const { inline, bindingMetadata } = context
const rewriteIdentifier = (
raw: string,
parent?: Node | null,
id?: Identifier,
) => {
const type = hasOwn(bindingMetadata, raw) && bindingMetadata[raw]
if (inline) {
// x = y
const isAssignmentLVal =
parent && parent.type === 'AssignmentExpression' && parent.left === id
// x++
const isUpdateArg =
parent && parent.type === 'UpdateExpression' && parent.argument === id
// ({ x } = y)
const isDestructureAssignment =
parent && isInDestructureAssignment(parent, parentStack)
const isNewExpression = parent && isInNewExpression(parentStack)
const wrapWithUnref = (raw: string) => {
const wrapped = `${context.helperString(UNREF)}(${raw})`
return isNewExpression ? `(${wrapped})` : wrapped
}
if (
isConst(type) ||
type === BindingTypes.SETUP_REACTIVE_CONST ||
localVars[raw]
) {
return raw
} else if (type === BindingTypes.SETUP_REF) {
return `${raw}.value`
} else if (type === BindingTypes.SETUP_MAYBE_REF) {
// const binding that may or may not be ref
// if it's not a ref, then assignments don't make sense -
// so we ignore the non-ref assignment case and generate code
// that assumes the value to be a ref for more efficiency
return isAssignmentLVal || isUpdateArg || isDestructureAssignment
? `${raw}.value`
: wrapWithUnref(raw)
} else if (type === BindingTypes.SETUP_LET) {
if (isAssignmentLVal) {
// let binding.
// this is a bit more tricky as we need to cover the case where
// let is a local non-ref value, and we need to replicate the
// right hand side value.
// x = y --> isRef(x) ? x.value = y : x = y
const { right: rVal, operator } = parent as AssignmentExpression
const rExp = rawExp.slice(rVal.start! - 1, rVal.end! - 1)
const rExpString = stringifyExpression(
processExpression(
createSimpleExpression(rExp, false),
context,
false,
false,
knownIds,
),
)
return `${context.helperString(IS_REF)}(${raw})${
context.isTS ? ` //@ts-ignore\n` : ``
} ? ${raw}.value ${operator} ${rExpString} : ${raw}`
} else if (isUpdateArg) {
// make id replace parent in the code range so the raw update operator
// is removed
id!.start = parent!.start
id!.end = parent!.end
const { prefix: isPrefix, operator } = parent as UpdateExpression
const prefix = isPrefix ? operator : ``
const postfix = isPrefix ? `` : operator
// let binding.
// x++ --> isRef(a) ? a.value++ : a++
return `${context.helperString(IS_REF)}(${raw})${
context.isTS ? ` //@ts-ignore\n` : ``
} ? ${prefix}${raw}.value${postfix} : ${prefix}${raw}${postfix}`
} else if (isDestructureAssignment) {
// TODO
// let binding in a destructure assignment - it's very tricky to
// handle both possible cases here without altering the original
// structure of the code, so we just assume it's not a ref here
// for now
return raw
} else {
return wrapWithUnref(raw)
}
} else if (type === BindingTypes.PROPS) {
// use __props which is generated by compileScript so in ts mode
// it gets correct type
return genPropsAccessExp(raw)
} else if (type === BindingTypes.PROPS_ALIASED) {
// prop with a different local alias (from defineProps() destructure)
return genPropsAccessExp(bindingMetadata.__propsAliases![raw])
}
} else {
if (
(type && type.startsWith('setup')) ||
type === BindingTypes.LITERAL_CONST
) {
// setup bindings in non-inline mode
return `$setup.${raw}`
} else if (type === BindingTypes.PROPS_ALIASED) {
return `$props['${bindingMetadata.__propsAliases![raw]}']`
} else if (type) {
return `$${type}.${raw}`
}
}
// fallback to ctx
return `_ctx.${raw}`
}
// fast path if expression is a simple identifier.
const rawExp = node.content
let ast = node.ast
if (ast === false) {
// ast being false means it has caused an error already during parse phase
return node
}
if (ast === null || (!ast && isSimpleIdentifier(rawExp))) {
const isScopeVarReference = context.identifiers[rawExp]
const isAllowedGlobal = isGloballyAllowed(rawExp)
const isLiteral = isLiteralWhitelisted(rawExp)
if (
!asParams &&
!isScopeVarReference &&
!isLiteral &&
(!isAllowedGlobal || bindingMetadata[rawExp])
) {
// const bindings exposed from setup can be skipped for patching but
// cannot be hoisted to module scope
if (isConst(bindingMetadata[rawExp])) {
node.constType = ConstantTypes.CAN_SKIP_PATCH
}
node.content = rewriteIdentifier(rawExp)
} else if (!isScopeVarReference) {
if (isLiteral) {
node.constType = ConstantTypes.CAN_STRINGIFY
} else {
node.constType = ConstantTypes.CAN_CACHE
}
}
return node
}
if (!ast) {
// exp needs to be parsed differently:
// 1. Multiple inline statements (v-on, with presence of `;`): parse as raw
// exp, but make sure to pad with spaces for consistent ranges
// 2. Expressions: wrap with parens (for e.g. object expressions)
// 3. Function arguments (v-for, v-slot): place in a function argument position
const source = asRawStatements
? ` ${rawExp} `
: `(${rawExp})${asParams ? `=>{}` : ``}`
try {
ast = parseExpression(source, {
sourceType: 'module',
plugins: context.expressionPlugins,
})
} catch (e: any) {
context.onError(
createCompilerError(
ErrorCodes.X_INVALID_EXPRESSION,
node.loc,
undefined,
e.message,
),
)
return node
}
}
type QualifiedId = Identifier & PrefixMeta
const ids: QualifiedId[] = []
const parentStack: Node[] = []
const knownIds: Record<string, number> = Object.create(context.identifiers)
walkIdentifiers(
ast,
(node, parent, _, isReferenced, isLocal) => {
if (isStaticPropertyKey(node, parent!)) {
return
}
// v2 wrapped filter call
if (__COMPAT__ && node.name.startsWith('_filter_')) {
return
}
const needPrefix = isReferenced && canPrefix(node)
if (needPrefix && !isLocal) {
if (isStaticProperty(parent!) && parent.shorthand) {
// property shorthand like { foo }, we need to add the key since
// we rewrite the value
;(node as QualifiedId).prefix = `${node.name}: `
}
node.name = rewriteIdentifier(node.name, parent, node)
ids.push(node as QualifiedId)
} else {
// The identifier is considered constant unless it's pointing to a
// local scope variable (a v-for alias, or a v-slot prop)
if (
!(needPrefix && isLocal) &&
(!parent ||
(parent.type !== 'CallExpression' &&
parent.type !== 'NewExpression' &&
parent.type !== 'MemberExpression'))
) {
;(node as QualifiedId).isConstant = true
}
// also generate sub-expressions for other identifiers for better
// source map support. (except for property keys which are static)
ids.push(node as QualifiedId)
}
},
true, // invoke on ALL identifiers
parentStack,
knownIds,
)
// We break up the compound expression into an array of strings and sub
// expressions (for identifiers that have been prefixed). In codegen, if
// an ExpressionNode has the `.children` property, it will be used instead of
// `.content`.
const children: CompoundExpressionNode['children'] = []
ids.sort((a, b) => a.start - b.start)
ids.forEach((id, i) => {
// range is offset by -1 due to the wrapping parens when parsed
const start = id.start - 1
const end = id.end - 1
const last = ids[i - 1]
const leadingText = rawExp.slice(last ? last.end - 1 : 0, start)
if (leadingText.length || id.prefix) {
children.push(leadingText + (id.prefix || ``))
}
const source = rawExp.slice(start, end)
children.push(
createSimpleExpression(
id.name,
false,
{
start: advancePositionWithClone(node.loc.start, source, start),
end: advancePositionWithClone(node.loc.start, source, end),
source,
},
id.isConstant
? ConstantTypes.CAN_STRINGIFY
: ConstantTypes.NOT_CONSTANT,
),
)
if (i === ids.length - 1 && end < rawExp.length) {
children.push(rawExp.slice(end))
}
})
let ret
if (children.length) {
ret = createCompoundExpression(children, node.loc)
ret.ast = ast
} else {
ret = node
ret.constType = ConstantTypes.CAN_STRINGIFY
}
ret.identifiers = Object.keys(knownIds)
return ret
}
function canPrefix(id: Identifier) {
// skip whitelisted globals
if (isGloballyAllowed(id.name)) {
return false
}
// special case for webpack compilation
if (id.name === 'require') {
return false
}
return true
}
export function stringifyExpression(exp: ExpressionNode | string): string {
if (isString(exp)) {
return exp
} else if (exp.type === NodeTypes.SIMPLE_EXPRESSION) {
return exp.content
} else {
return (exp.children as (ExpressionNode | string)[])
.map(stringifyExpression)
.join('')
}
}
function isConst(type: unknown) {
return (
type === BindingTypes.SETUP_CONST || type === BindingTypes.LITERAL_CONST
)
}
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