Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 | 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 151x 151x 139x 139x 139x 139x 139x 139x 139x 4x 4x 139x 139x 23x 2x 2x 21x 139x 139x 139x 23x 1x 1x 1x 1x 1x 23x 10x 10x 10x 10x 10x 23x 139x 139x 137x 139x 3x 136x 23x 113x 139x 139x 139x 139x 139x 139x 139x 139x 139x 139x 139x 139x 139x 139x 139x 139x 139x 23x 25x 14x 14x 2x 2x 2x 2x 2x 2x 2x 2x 14x 23x 23x 139x 139x 139x 3x 136x 23x 17x 2x 134x 139x 5x 5x 139x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 13x 134x 121x 121x 121x 6x 6x 121x 105x 105x 105x 105x 105x 105x 105x 121x 121x 118x 118x 121x 3x 3x 121x 139x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 137x 135x 135x 135x 135x 135x 135x 135x 135x 139x 151x 151x 2x 2x 170x 170x 170x 170x 170x 170x 2x 2x 2x 2x 2x 168x 170x 10x 10x 10x 10x 10x 158x 158x 158x 158x 158x 158x 158x 158x 158x 158x 158x 170x 170x 170x 170x 170x 59x 59x 59x 59x 158x 170x 158x 158x 59x 59x 59x 59x 158x 158x 170x 2x 166x 166x 166x 166x 166x 63x 63x 63x 63x 63x 8x 8x 8x 8x 8x 8x 63x 2x 2x 2x 2x 2x 2x 63x 63x 63x 63x 63x 63x 63x 63x 166x 162x 162x 2x 162x 162x 162x 162x 162x 162x 162x 162x 162x 162x 415x 415x 162x 162x 162x 162x | import {
type NodeTransform,
type TransformContext,
createStructuralDirectiveTransform,
} from '../transform'
import {
type BlockCodegenNode,
ConstantTypes,
type DirectiveNode,
type ElementNode,
type ExpressionNode,
type ForCodegenNode,
type ForIteratorExpression,
type ForNode,
type ForParseResult,
type ForRenderListExpression,
NodeTypes,
type PlainElementNode,
type RenderSlotCall,
type SimpleExpressionNode,
type SlotOutletNode,
type VNodeCall,
createBlockStatement,
createCallExpression,
createCompoundExpression,
createFunctionExpression,
createObjectExpression,
createObjectProperty,
createSimpleExpression,
createVNodeCall,
getVNodeBlockHelper,
getVNodeHelper,
} from '../ast'
import { ErrorCodes, createCompilerError } from '../errors'
import {
findDir,
findProp,
injectProp,
isSlotOutlet,
isTemplateNode,
} from '../utils'
import {
FRAGMENT,
IS_MEMO_SAME,
OPEN_BLOCK,
RENDER_LIST,
} from '../runtimeHelpers'
import { processExpression } from './transformExpression'
import { validateBrowserExpression } from '../validateExpression'
import { PatchFlags } from '@vue/shared'
import { transformBindShorthand } from './vBind'
export const transformFor: NodeTransform = createStructuralDirectiveTransform(
'for',
(node, dir, context) => {
const { helper, removeHelper } = context
return processFor(node, dir, context, forNode => {
// create the loop render function expression now, and add the
// iterator on exit after all children have been traversed
const renderExp = createCallExpression(helper(RENDER_LIST), [
forNode.source,
]) as ForRenderListExpression
const isTemplate = isTemplateNode(node)
const memo = findDir(node, 'memo')
const keyProp = findProp(node, `key`, false, true)
if (keyProp && keyProp.type === NodeTypes.DIRECTIVE && !keyProp.exp) {
// resolve :key shorthand #10882
transformBindShorthand(keyProp, context)
}
const keyExp =
keyProp &&
(keyProp.type === NodeTypes.ATTRIBUTE
? keyProp.value
? createSimpleExpression(keyProp.value.content, true)
: undefined
: keyProp.exp)
const keyProperty =
keyProp && keyExp ? createObjectProperty(`key`, keyExp) : null
if (!__BROWSER__ && isTemplate) {
// #2085 / #5288 process :key and v-memo expressions need to be
// processed on `<template v-for>`. In this case the node is discarded
// and never traversed so its binding expressions won't be processed
// by the normal transforms.
if (memo) {
memo.exp = processExpression(
memo.exp! as SimpleExpressionNode,
context,
)
}
if (keyProperty && keyProp!.type !== NodeTypes.ATTRIBUTE) {
keyProperty.value = processExpression(
keyProperty.value as SimpleExpressionNode,
context,
)
}
}
const isStableFragment =
forNode.source.type === NodeTypes.SIMPLE_EXPRESSION &&
forNode.source.constType > ConstantTypes.NOT_CONSTANT
const fragmentFlag = isStableFragment
? PatchFlags.STABLE_FRAGMENT
: keyProp
? PatchFlags.KEYED_FRAGMENT
: PatchFlags.UNKEYED_FRAGMENT
forNode.codegenNode = createVNodeCall(
context,
helper(FRAGMENT),
undefined,
renderExp,
fragmentFlag,
undefined,
undefined,
true /* isBlock */,
!isStableFragment /* disableTracking */,
false /* isComponent */,
node.loc,
) as ForCodegenNode
return () => {
// finish the codegen now that all children have been traversed
let childBlock: BlockCodegenNode
const { children } = forNode
// check <template v-for> key placement
if ((__DEV__ || !__BROWSER__) && isTemplate) {
node.children.some(c => {
if (c.type === NodeTypes.ELEMENT) {
const key = findProp(c, 'key')
if (key) {
context.onError(
createCompilerError(
ErrorCodes.X_V_FOR_TEMPLATE_KEY_PLACEMENT,
key.loc,
),
)
return true
}
}
})
}
const needFragmentWrapper =
children.length !== 1 || children[0].type !== NodeTypes.ELEMENT
const slotOutlet = isSlotOutlet(node)
? node
: isTemplate &&
node.children.length === 1 &&
isSlotOutlet(node.children[0])
? (node.children[0] as SlotOutletNode) // api-extractor somehow fails to infer this
: null
if (slotOutlet) {
// <slot v-for="..."> or <template v-for="..."><slot/></template>
childBlock = slotOutlet.codegenNode as RenderSlotCall
if (isTemplate && keyProperty) {
// <template v-for="..." :key="..."><slot/></template>
// we need to inject the key to the renderSlot() call.
// the props for renderSlot is passed as the 3rd argument.
injectProp(childBlock, keyProperty, context)
}
} else if (needFragmentWrapper) {
// <template v-for="..."> with text or multi-elements
// should generate a fragment block for each loop
childBlock = createVNodeCall(
context,
helper(FRAGMENT),
keyProperty ? createObjectExpression([keyProperty]) : undefined,
node.children,
PatchFlags.STABLE_FRAGMENT,
undefined,
undefined,
true,
undefined,
false /* isComponent */,
)
} else {
// Normal element v-for. Directly use the child's codegenNode
// but mark it as a block.
childBlock = (children[0] as PlainElementNode)
.codegenNode as VNodeCall
if (isTemplate && keyProperty) {
injectProp(childBlock, keyProperty, context)
}
if (childBlock.isBlock !== !isStableFragment) {
if (childBlock.isBlock) {
// switch from block to vnode
removeHelper(OPEN_BLOCK)
removeHelper(
getVNodeBlockHelper(context.inSSR, childBlock.isComponent),
)
} else {
// switch from vnode to block
removeHelper(
getVNodeHelper(context.inSSR, childBlock.isComponent),
)
}
}
childBlock.isBlock = !isStableFragment
if (childBlock.isBlock) {
helper(OPEN_BLOCK)
helper(getVNodeBlockHelper(context.inSSR, childBlock.isComponent))
} else {
helper(getVNodeHelper(context.inSSR, childBlock.isComponent))
}
}
if (memo) {
const loop = createFunctionExpression(
createForLoopParams(forNode.parseResult, [
createSimpleExpression(`_cached`),
]),
)
loop.body = createBlockStatement([
createCompoundExpression([`const _memo = (`, memo.exp!, `)`]),
createCompoundExpression([
`if (_cached`,
...(keyExp ? [` && _cached.key === `, keyExp] : []),
` && ${context.helperString(
IS_MEMO_SAME,
)}(_cached, _memo)) return _cached`,
]),
createCompoundExpression([`const _item = `, childBlock as any]),
createSimpleExpression(`_item.memo = _memo`),
createSimpleExpression(`return _item`),
])
renderExp.arguments.push(
loop as ForIteratorExpression,
createSimpleExpression(`_cache`),
createSimpleExpression(String(context.cached.length)),
)
// increment cache count
context.cached.push(null)
} else {
renderExp.arguments.push(
createFunctionExpression(
createForLoopParams(forNode.parseResult),
childBlock,
true /* force newline */,
) as ForIteratorExpression,
)
}
}
})
},
)
// target-agnostic transform used for both Client and SSR
export function processFor(
node: ElementNode,
dir: DirectiveNode,
context: TransformContext,
processCodegen?: (forNode: ForNode) => (() => void) | undefined,
) {
if (!dir.exp) {
context.onError(
createCompilerError(ErrorCodes.X_V_FOR_NO_EXPRESSION, dir.loc),
)
return
}
const parseResult = dir.forParseResult
if (!parseResult) {
context.onError(
createCompilerError(ErrorCodes.X_V_FOR_MALFORMED_EXPRESSION, dir.loc),
)
return
}
finalizeForParseResult(parseResult, context)
const { addIdentifiers, removeIdentifiers, scopes } = context
const { source, value, key, index } = parseResult
const forNode: ForNode = {
type: NodeTypes.FOR,
loc: dir.loc,
source,
valueAlias: value,
keyAlias: key,
objectIndexAlias: index,
parseResult,
children: isTemplateNode(node) ? node.children : [node],
}
context.replaceNode(forNode)
// bookkeeping
scopes.vFor++
if (!__BROWSER__ && context.prefixIdentifiers) {
// scope management
// inject identifiers to context
value && addIdentifiers(value)
key && addIdentifiers(key)
index && addIdentifiers(index)
}
const onExit = processCodegen && processCodegen(forNode)
return (): void => {
scopes.vFor--
if (!__BROWSER__ && context.prefixIdentifiers) {
value && removeIdentifiers(value)
key && removeIdentifiers(key)
index && removeIdentifiers(index)
}
if (onExit) onExit()
}
}
export function finalizeForParseResult(
result: ForParseResult,
context: TransformContext,
): void {
if (result.finalized) return
if (!__BROWSER__ && context.prefixIdentifiers) {
result.source = processExpression(
result.source as SimpleExpressionNode,
context,
)
if (result.key) {
result.key = processExpression(
result.key as SimpleExpressionNode,
context,
true,
)
}
if (result.index) {
result.index = processExpression(
result.index as SimpleExpressionNode,
context,
true,
)
}
if (result.value) {
result.value = processExpression(
result.value as SimpleExpressionNode,
context,
true,
)
}
}
if (__DEV__ && __BROWSER__) {
validateBrowserExpression(result.source as SimpleExpressionNode, context)
if (result.key) {
validateBrowserExpression(
result.key as SimpleExpressionNode,
context,
true,
)
}
if (result.index) {
validateBrowserExpression(
result.index as SimpleExpressionNode,
context,
true,
)
}
if (result.value) {
validateBrowserExpression(
result.value as SimpleExpressionNode,
context,
true,
)
}
}
result.finalized = true
}
export function createForLoopParams(
{ value, key, index }: ForParseResult,
memoArgs: ExpressionNode[] = [],
): ExpressionNode[] {
return createParamsList([value, key, index, ...memoArgs])
}
function createParamsList(
args: (ExpressionNode | undefined)[],
): ExpressionNode[] {
let i = args.length
while (i--) {
if (args[i]) break
}
return args
.slice(0, i + 1)
.map((arg, i) => arg || createSimpleExpression(`_`.repeat(i + 1), false))
}
|