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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 | 83x 83x 83x 83x 83x 83x 83x 83x 83x 83x 1519x 150x 1369x 729x 500x 500x 330x 330x 330x 223x 330x 21x 83x 590x 590x 18x 572x 572x 384x 384x 64x 64x 64x 64x 11x 53x 14x 39x 9x 30x 11x 5x 5x 5x 5x 6x 2x 2x 2x 2x 2x 2x 4x 1x 3x 19x 4x 15x 1x 320x 1x 319x 319x 3x 330x 572x 572x 572x 388x 388x 388x 388x 249x 3x 249x 139x 79x 23x 56x 388x 184x 184x 184x 2x 2x 182x 182x 182x 182x 292x 62x 230x 230x 230x 135x 9x 135x 135x 95x 2x 95x 182x 182x 182x 230x 230x 230x 230x 230x 174x 230x 230x 230x 90x 182x 124x 58x 58x 182x 182x 205x 1x 204x 204x 5x 5x 5x | // - Parse expressions in templates into compound expressions so that each
// 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 { NodeTransform, TransformContext } from '../transform'
import {
NodeTypes,
createSimpleExpression,
ExpressionNode,
SimpleExpressionNode,
CompoundExpressionNode,
createCompoundExpression,
ConstantTypes
} from '../ast'
import {
isInDestructureAssignment,
isStaticProperty,
isStaticPropertyKey,
walkIdentifiers
} from '../babelUtils'
import { advancePositionWithClone, isSimpleIdentifier } from '../utils'
import { isGloballyWhitelisted, makeMap, hasOwn, isString } from '@vue/shared'
import { createCompilerError, ErrorCodes } from '../errors'
import {
Node,
Identifier,
AssignmentExpression,
UpdateExpression
} from '@babel/types'
import { validateBrowserExpression } from '../validateExpression'
import { parse } 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 {
Iif (__BROWSER__) {
Iif (__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, 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)
if (type === BindingTypes.SETUP_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
? `${raw}.value`
: `${context.helperString(UNREF)}(${raw})`
} else if (type === BindingTypes.SETUP_LET) {
if (isAssignmentLVal) {
// let binding.
// this is a bit more tricky as we need to cover the case where
// let is a local non-ref value, and we need to replicate the
// right hand side value.
// x = y --> isRef(x) ? x.value = y : x = y
const { right: rVal, operator } = parent as AssignmentExpression
const rExp = rawExp.slice(rVal.start! - 1, rVal.end! - 1)
const rExpString = stringifyExpression(
processExpression(
createSimpleExpression(rExp, false),
context,
false,
false,
knownIds
)
)
return `${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}${postfix}`
} else if (isDestructureAssignment) {
// TODO
// let binding in a destructure assignment - it's very tricky to
// handle both possible cases here without altering the original
// structure of the code, so we just assume it's not a ref here
// for now
return raw
} else {
return `${context.helperString(UNREF)}(${raw})`
}
} else if (type === BindingTypes.PROPS) {
// use __props which is generated by compileScript so in ts mode
// it gets correct type
return `__props.${raw}`
} else if (type === BindingTypes.PROPS_ALIASED) {
// prop with a different local alias (from defineProps() destructure)
return `__props.${bindingMetadata.__propsAliases![raw]}`
}
} else {
if (type && type.startsWith('setup')) {
// setup bindings in non-inline mode
return `$setup.${raw}`
} else Iif (type === BindingTypes.PROPS_ALIASED) {
return `$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
// bail constant on parens (function invocation) and dot (member access)
const bailConstant = rawExp.indexOf(`(`) > -1 || rawExp.indexOf('.') > 0
if (isSimpleIdentifier(rawExp)) {
const isScopeVarReference = context.identifiers[rawExp]
const isAllowedGlobal = isGloballyWhitelisted(rawExp)
const isLiteral = isLiteralWhitelisted(rawExp)
if (!asParams && !isScopeVarReference && !isAllowedGlobal && !isLiteral) {
// const bindings exposed from setup can be skipped for patching but
// cannot be hoisted to module scope
if (bindingMetadata[node.content] === BindingTypes.SETUP_CONST) {
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_HOIST
}
}
return node
}
let ast: any
// 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})${asParams ? `=>{}` : ``}`
try {
ast = parse(source, {
plugins: context.expressionPlugins
}).program
} catch (e: any) {
context.onError(
createCompilerError(
ErrorCodes.X_INVALID_EXPRESSION,
node.loc,
undefined,
e.message
)
)
return node
}
type QualifiedId = Identifier & PrefixMeta
const ids: QualifiedId[] = []
const parentStack: Node[] = []
const knownIds: Record<string, number> = Object.create(context.identifiers)
walkIdentifiers(
ast,
(node, parent, _, isReferenced, isLocal) => {
if (isStaticPropertyKey(node, parent!)) {
return
}
// v2 wrapped filter call
Iif (__COMPAT__ && node.name.startsWith('_filter_')) {
return
}
const needPrefix = isReferenced && canPrefix(node)
if (needPrefix && !isLocal) {
if (isStaticProperty(parent!) && parent.shorthand) {
// property shorthand like { foo }, we need to add the key since
// we rewrite the value
;(node as QualifiedId).prefix = `${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) && !bailConstant) {
;(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,
{
source,
start: advancePositionWithClone(node.loc.start, source, start),
end: advancePositionWithClone(node.loc.start, source, end)
},
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)
} else {
ret = node
ret.constType = bailConstant
? ConstantTypes.NOT_CONSTANT
: ConstantTypes.CAN_STRINGIFY
}
ret.identifiers = Object.keys(knownIds)
return ret
}
function canPrefix(id: Identifier) {
// skip whitelisted globals
if (isGloballyWhitelisted(id.name)) {
return false
}
// special case for webpack compilation
Iif (id.name === 'require') {
return false
}
return true
}
function stringifyExpression(exp: ExpressionNode | string): string {
Iif (isString(exp)) {
return exp
} else if (exp.type === NodeTypes.SIMPLE_EXPRESSION) {
return exp.content
} else E{
return (exp.children as (ExpressionNode | string)[])
.map(stringifyExpression)
.join('')
}
}
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