| 1 | /** |
| 2 | * Copyright (c) Meta Platforms, Inc. and affiliates. |
| 3 | * |
| 4 | * This source code is licensed under the MIT license found in the |
| 5 | * LICENSE file in the root directory of this source tree. |
| 6 | */ |
| 7 | |
| 8 | import { |
| 9 | HIRFunction, |
| 10 | InstructionId, |
| 11 | Place, |
| 12 | PrunedReactiveScopeBlock, |
| 13 | ReactiveBlock, |
| 14 | ReactiveFunction, |
| 15 | ReactiveInstruction, |
| 16 | ReactiveScopeBlock, |
| 17 | ReactiveStatement, |
| 18 | ReactiveTerminal, |
| 19 | ReactiveTerminalStatement, |
| 20 | ReactiveValue, |
| 21 | } from '../HIR/HIR'; |
| 22 | import { |
| 23 | eachInstructionLValue, |
| 24 | eachInstructionValueOperand, |
| 25 | eachTerminalOperand, |
| 26 | } from '../HIR/visitors'; |
| 27 | import {assertExhaustive} from '../Utils/utils'; |
| 28 | |
| 29 | export function visitReactiveFunction<TState>( |
| 30 | fn: ReactiveFunction, |
| 31 | visitor: ReactiveFunctionVisitor<TState>, |
| 32 | state: TState, |
| 33 | ): void { |
| 34 | visitor.visitBlock(fn.body, state); |
| 35 | } |
| 36 | |
| 37 | export class ReactiveFunctionVisitor<TState = void> { |
| 38 | visitID(_id: InstructionId, _state: TState): void {} |
| 39 | visitParam(_place: Place, _state: TState): void {} |
| 40 | visitLValue(_id: InstructionId, _lvalue: Place, _state: TState): void {} |
| 41 | visitPlace(_id: InstructionId, _place: Place, _state: TState): void {} |
| 42 | visitReactiveFunctionValue( |
| 43 | _id: InstructionId, |
| 44 | _dependencies: Array<Place>, |
| 45 | _fn: ReactiveFunction, |
| 46 | _state: TState, |
| 47 | ): void {} |
| 48 | |
| 49 | visitValue(id: InstructionId, value: ReactiveValue, state: TState): void { |
| 50 | this.traverseValue(id, value, state); |
| 51 | } |
| 52 | traverseValue(id: InstructionId, value: ReactiveValue, state: TState): void { |
| 53 | switch (value.kind) { |
| 54 | case 'OptionalExpression': { |
| 55 | this.visitValue(id, value.value, state); |
| 56 | break; |
| 57 | } |
| 58 | case 'LogicalExpression': { |
| 59 | this.visitValue(id, value.left, state); |
| 60 | this.visitValue(id, value.right, state); |
| 61 | break; |
| 62 | } |
| 63 | case 'ConditionalExpression': { |
| 64 | this.visitValue(id, value.test, state); |
| 65 | this.visitValue(id, value.consequent, state); |
| 66 | this.visitValue(id, value.alternate, state); |
| 67 | break; |
| 68 | } |
| 69 | case 'SequenceExpression': { |
| 70 | for (const instr of value.instructions) { |
| 71 | this.visitInstruction(instr, state); |
| 72 | } |
| 73 | this.visitValue(value.id, value.value, state); |
| 74 | break; |
| 75 | } |
| 76 | default: { |
| 77 | for (const place of eachInstructionValueOperand(value)) { |
| 78 | this.visitPlace(id, place, state); |
| 79 | } |
| 80 | } |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | visitInstruction(instruction: ReactiveInstruction, state: TState): void { |
| 85 | this.traverseInstruction(instruction, state); |
| 86 | } |
| 87 | traverseInstruction(instruction: ReactiveInstruction, state: TState): void { |
| 88 | this.visitID(instruction.id, state); |
| 89 | for (const operand of eachInstructionLValue(instruction)) { |
| 90 | this.visitLValue(instruction.id, operand, state); |
| 91 | } |
| 92 | this.visitValue(instruction.id, instruction.value, state); |
| 93 | } |
| 94 | |
| 95 | visitTerminal(stmt: ReactiveTerminalStatement, state: TState): void { |
| 96 | this.traverseTerminal(stmt, state); |
| 97 | } |
| 98 | traverseTerminal(stmt: ReactiveTerminalStatement, state: TState): void { |
| 99 | const {terminal} = stmt; |
| 100 | if (terminal.id !== null) { |
| 101 | this.visitID(terminal.id, state); |
| 102 | } |
| 103 | switch (terminal.kind) { |
| 104 | case 'break': |
| 105 | case 'continue': { |
| 106 | break; |
| 107 | } |
| 108 | case 'return': { |
| 109 | this.visitPlace(terminal.id, terminal.value, state); |
| 110 | break; |
| 111 | } |
| 112 | case 'throw': { |
| 113 | this.visitPlace(terminal.id, terminal.value, state); |
| 114 | break; |
| 115 | } |
| 116 | case 'for': { |
| 117 | this.visitValue(terminal.id, terminal.init, state); |
| 118 | this.visitValue(terminal.id, terminal.test, state); |
| 119 | this.visitBlock(terminal.loop, state); |
| 120 | if (terminal.update !== null) { |
| 121 | this.visitValue(terminal.id, terminal.update, state); |
| 122 | } |
| 123 | break; |
| 124 | } |
| 125 | case 'for-of': { |
| 126 | this.visitValue(terminal.id, terminal.init, state); |
| 127 | this.visitValue(terminal.id, terminal.test, state); |
| 128 | this.visitBlock(terminal.loop, state); |
| 129 | break; |
| 130 | } |
| 131 | case 'for-in': { |
| 132 | this.visitValue(terminal.id, terminal.init, state); |
| 133 | this.visitBlock(terminal.loop, state); |
| 134 | break; |
| 135 | } |
| 136 | case 'do-while': { |
| 137 | this.visitBlock(terminal.loop, state); |
| 138 | this.visitValue(terminal.id, terminal.test, state); |
| 139 | break; |
| 140 | } |
| 141 | case 'while': { |
| 142 | this.visitValue(terminal.id, terminal.test, state); |
| 143 | this.visitBlock(terminal.loop, state); |
| 144 | break; |
| 145 | } |
| 146 | case 'if': { |
| 147 | this.visitPlace(terminal.id, terminal.test, state); |
| 148 | this.visitBlock(terminal.consequent, state); |
| 149 | if (terminal.alternate !== null) { |
| 150 | this.visitBlock(terminal.alternate, state); |
| 151 | } |
| 152 | break; |
| 153 | } |
| 154 | case 'switch': { |
| 155 | this.visitPlace(terminal.id, terminal.test, state); |
| 156 | for (const case_ of terminal.cases) { |
| 157 | if (case_.test !== null) { |
| 158 | this.visitPlace(terminal.id, case_.test, state); |
| 159 | } |
| 160 | if (case_.block !== undefined) { |
| 161 | this.visitBlock(case_.block, state); |
| 162 | } |
| 163 | } |
| 164 | break; |
| 165 | } |
| 166 | case 'label': { |
| 167 | this.visitBlock(terminal.block, state); |
| 168 | break; |
| 169 | } |
| 170 | case 'try': { |
| 171 | this.visitBlock(terminal.block, state); |
| 172 | this.visitBlock(terminal.handler, state); |
| 173 | break; |
| 174 | } |
| 175 | default: { |
| 176 | assertExhaustive( |
| 177 | terminal, |
| 178 | `Unexpected terminal kind \`${(terminal as any).kind}\``, |
| 179 | ); |
| 180 | } |
| 181 | } |
| 182 | } |
| 183 | |
| 184 | visitScope(scope: ReactiveScopeBlock, state: TState): void { |
| 185 | this.traverseScope(scope, state); |
| 186 | } |
| 187 | traverseScope(scope: ReactiveScopeBlock, state: TState): void { |
| 188 | this.visitBlock(scope.instructions, state); |
| 189 | } |
| 190 | |
| 191 | visitPrunedScope(scopeBlock: PrunedReactiveScopeBlock, state: TState): void { |
| 192 | this.traversePrunedScope(scopeBlock, state); |
| 193 | } |
| 194 | traversePrunedScope( |
| 195 | scopeBlock: PrunedReactiveScopeBlock, |
| 196 | state: TState, |
| 197 | ): void { |
| 198 | this.visitBlock(scopeBlock.instructions, state); |
| 199 | } |
| 200 | |
| 201 | visitBlock(block: ReactiveBlock, state: TState): void { |
| 202 | this.traverseBlock(block, state); |
| 203 | } |
| 204 | traverseBlock(block: ReactiveBlock, state: TState): void { |
| 205 | for (const instr of block) { |
| 206 | switch (instr.kind) { |
| 207 | case 'instruction': { |
| 208 | this.visitInstruction(instr.instruction, state); |
| 209 | break; |
| 210 | } |
| 211 | case 'scope': { |
| 212 | this.visitScope(instr, state); |
| 213 | break; |
| 214 | } |
| 215 | case 'pruned-scope': { |
| 216 | this.visitPrunedScope(instr, state); |
| 217 | break; |
| 218 | } |
| 219 | case 'terminal': { |
| 220 | this.visitTerminal(instr, state); |
| 221 | break; |
| 222 | } |
| 223 | default: { |
| 224 | assertExhaustive( |
| 225 | instr, |
| 226 | `Unexpected instruction kind \`${(instr as any).kind}\``, |
| 227 | ); |
| 228 | } |
| 229 | } |
| 230 | } |
| 231 | } |
| 232 | |
| 233 | visitHirFunction(fn: HIRFunction, state: TState): void { |
| 234 | for (const param of fn.params) { |
| 235 | const place = param.kind === 'Identifier' ? param : param.place; |
| 236 | this.visitParam(place, state); |
| 237 | } |
| 238 | for (const [, block] of fn.body.blocks) { |
| 239 | for (const instr of block.instructions) { |
| 240 | this.visitInstruction(instr, state); |
| 241 | if ( |
| 242 | instr.value.kind === 'FunctionExpression' || |
| 243 | instr.value.kind === 'ObjectMethod' |
| 244 | ) { |
| 245 | this.visitHirFunction(instr.value.loweredFunc.func, state); |
| 246 | } |
| 247 | } |
| 248 | for (const operand of eachTerminalOperand(block.terminal)) { |
| 249 | this.visitPlace(block.terminal.id, operand, state); |
| 250 | } |
| 251 | } |
| 252 | } |
| 253 | } |
| 254 | |
| 255 | export type TransformedValue = |
| 256 | | {kind: 'keep'} |
| 257 | | {kind: 'replace'; value: ReactiveValue}; |
| 258 | |
| 259 | export type Transformed<T> = |
| 260 | | {kind: 'remove'} |
| 261 | | {kind: 'keep'} |
| 262 | | {kind: 'replace'; value: T} |
| 263 | | {kind: 'replace-many'; value: Array<T>}; |
| 264 | |
| 265 | export class ReactiveFunctionTransform< |
| 266 | TState = void, |
| 267 | > extends ReactiveFunctionVisitor<TState> { |
| 268 | override traverseBlock(block: ReactiveBlock, state: TState): void { |
| 269 | let nextBlock: ReactiveBlock | null = null; |
| 270 | for (let i = 0; i < block.length; i++) { |
| 271 | const instr = block[i]!; |
| 272 | let transformed: Transformed<ReactiveStatement>; |
| 273 | switch (instr.kind) { |
| 274 | case 'instruction': { |
| 275 | transformed = this.transformInstruction(instr.instruction, state); |
| 276 | break; |
| 277 | } |
| 278 | case 'scope': { |
| 279 | transformed = this.transformScope(instr, state); |
| 280 | break; |
| 281 | } |
| 282 | case 'pruned-scope': { |
| 283 | transformed = this.transformPrunedScope(instr, state); |
| 284 | break; |
| 285 | } |
| 286 | case 'terminal': { |
| 287 | transformed = this.transformTerminal(instr, state); |
| 288 | break; |
| 289 | } |
| 290 | default: { |
| 291 | assertExhaustive( |
| 292 | instr, |
| 293 | `Unexpected instruction kind \`${(instr as any).kind}\``, |
| 294 | ); |
| 295 | } |
| 296 | } |
| 297 | switch (transformed.kind) { |
| 298 | case 'keep': { |
| 299 | if (nextBlock !== null) { |
| 300 | nextBlock.push(instr); |
| 301 | } |
| 302 | break; |
| 303 | } |
| 304 | case 'remove': { |
| 305 | if (nextBlock === null) { |
| 306 | nextBlock = block.slice(0, i); |
| 307 | } |
| 308 | break; |
| 309 | } |
| 310 | case 'replace': { |
| 311 | nextBlock ??= block.slice(0, i); |
| 312 | nextBlock.push(transformed.value); |
| 313 | break; |
| 314 | } |
| 315 | case 'replace-many': { |
| 316 | nextBlock ??= block.slice(0, i); |
| 317 | nextBlock.push(...transformed.value); |
| 318 | break; |
| 319 | } |
| 320 | } |
| 321 | } |
| 322 | if (nextBlock !== null) { |
| 323 | block.length = 0; |
| 324 | block.push(...nextBlock); |
| 325 | } |
| 326 | } |
| 327 | |
| 328 | transformInstruction( |
| 329 | instruction: ReactiveInstruction, |
| 330 | state: TState, |
| 331 | ): Transformed<ReactiveStatement> { |
| 332 | this.visitInstruction(instruction, state); |
| 333 | return {kind: 'keep'}; |
| 334 | } |
| 335 | |
| 336 | transformTerminal( |
| 337 | stmt: ReactiveTerminalStatement, |
| 338 | state: TState, |
| 339 | ): Transformed<ReactiveStatement> { |
| 340 | this.visitTerminal(stmt, state); |
| 341 | return {kind: 'keep'}; |
| 342 | } |
| 343 | |
| 344 | transformScope( |
| 345 | scope: ReactiveScopeBlock, |
| 346 | state: TState, |
| 347 | ): Transformed<ReactiveStatement> { |
| 348 | this.visitScope(scope, state); |
| 349 | return {kind: 'keep'}; |
| 350 | } |
| 351 | |
| 352 | transformPrunedScope( |
| 353 | scope: PrunedReactiveScopeBlock, |
| 354 | state: TState, |
| 355 | ): Transformed<ReactiveStatement> { |
| 356 | this.visitPrunedScope(scope, state); |
| 357 | return {kind: 'keep'}; |
| 358 | } |
| 359 | |
| 360 | transformValue( |
| 361 | id: InstructionId, |
| 362 | value: ReactiveValue, |
| 363 | state: TState, |
| 364 | ): TransformedValue { |
| 365 | this.visitValue(id, value, state); |
| 366 | return {kind: 'keep'}; |
| 367 | } |
| 368 | |
| 369 | transformReactiveFunctionValue( |
| 370 | id: InstructionId, |
| 371 | dependencies: Array<Place>, |
| 372 | fn: ReactiveFunction, |
| 373 | state: TState, |
| 374 | ): {kind: 'keep'} | {kind: 'replace'; value: ReactiveFunction} { |
| 375 | this.visitReactiveFunctionValue(id, dependencies, fn, state); |
| 376 | return {kind: 'keep'}; |
| 377 | } |
| 378 | |
| 379 | override traverseValue( |
| 380 | id: InstructionId, |
| 381 | value: ReactiveValue, |
| 382 | state: TState, |
| 383 | ): void { |
| 384 | switch (value.kind) { |
| 385 | case 'OptionalExpression': { |
| 386 | const nextValue = this.transformValue(id, value.value, state); |
| 387 | if (nextValue.kind === 'replace') { |
| 388 | value.value = nextValue.value; |
| 389 | } |
| 390 | break; |
| 391 | } |
| 392 | case 'LogicalExpression': { |
| 393 | const left = this.transformValue(id, value.left, state); |
| 394 | if (left.kind === 'replace') { |
| 395 | value.left = left.value; |
| 396 | } |
| 397 | const right = this.transformValue(id, value.right, state); |
| 398 | if (right.kind === 'replace') { |
| 399 | value.right = right.value; |
| 400 | } |
| 401 | break; |
| 402 | } |
| 403 | case 'ConditionalExpression': { |
| 404 | const test = this.transformValue(id, value.test, state); |
| 405 | if (test.kind === 'replace') { |
| 406 | value.test = test.value; |
| 407 | } |
| 408 | const consequent = this.transformValue(id, value.consequent, state); |
| 409 | if (consequent.kind === 'replace') { |
| 410 | value.consequent = consequent.value; |
| 411 | } |
| 412 | const alternate = this.transformValue(id, value.alternate, state); |
| 413 | if (alternate.kind === 'replace') { |
| 414 | value.alternate = alternate.value; |
| 415 | } |
| 416 | break; |
| 417 | } |
| 418 | case 'SequenceExpression': { |
| 419 | for (const instr of value.instructions) { |
| 420 | this.visitInstruction(instr, state); |
| 421 | } |
| 422 | const nextValue = this.transformValue(value.id, value.value, state); |
| 423 | if (nextValue.kind === 'replace') { |
| 424 | value.value = nextValue.value; |
| 425 | } |
| 426 | break; |
| 427 | } |
| 428 | default: { |
| 429 | for (const place of eachInstructionValueOperand(value)) { |
| 430 | this.visitPlace(id, place, state); |
| 431 | } |
| 432 | } |
| 433 | } |
| 434 | } |
| 435 | |
| 436 | override traverseInstruction( |
| 437 | instruction: ReactiveInstruction, |
| 438 | state: TState, |
| 439 | ): void { |
| 440 | this.visitID(instruction.id, state); |
| 441 | for (const operand of eachInstructionLValue(instruction)) { |
| 442 | this.visitLValue(instruction.id, operand, state); |
| 443 | } |
| 444 | const nextValue = this.transformValue( |
| 445 | instruction.id, |
| 446 | instruction.value, |
| 447 | state, |
| 448 | ); |
| 449 | if (nextValue.kind === 'replace') { |
| 450 | instruction.value = nextValue.value; |
| 451 | } |
| 452 | } |
| 453 | |
| 454 | override traverseTerminal( |
| 455 | stmt: ReactiveTerminalStatement, |
| 456 | state: TState, |
| 457 | ): void { |
| 458 | const {terminal} = stmt; |
| 459 | if (terminal.id !== null) { |
| 460 | this.visitID(terminal.id, state); |
| 461 | } |
| 462 | switch (terminal.kind) { |
| 463 | case 'break': |
| 464 | case 'continue': { |
| 465 | break; |
| 466 | } |
| 467 | case 'return': { |
| 468 | this.visitPlace(terminal.id, terminal.value, state); |
| 469 | break; |
| 470 | } |
| 471 | case 'throw': { |
| 472 | this.visitPlace(terminal.id, terminal.value, state); |
| 473 | break; |
| 474 | } |
| 475 | case 'for': { |
| 476 | const init = this.transformValue(terminal.id, terminal.init, state); |
| 477 | if (init.kind === 'replace') { |
| 478 | terminal.init = init.value; |
| 479 | } |
| 480 | const test = this.transformValue(terminal.id, terminal.test, state); |
| 481 | if (test.kind === 'replace') { |
| 482 | terminal.test = test.value; |
| 483 | } |
| 484 | if (terminal.update !== null) { |
| 485 | const update = this.transformValue( |
| 486 | terminal.id, |
| 487 | terminal.update, |
| 488 | state, |
| 489 | ); |
| 490 | if (update.kind === 'replace') { |
| 491 | terminal.update = update.value; |
| 492 | } |
| 493 | } |
| 494 | this.visitBlock(terminal.loop, state); |
| 495 | break; |
| 496 | } |
| 497 | case 'for-of': { |
| 498 | const init = this.transformValue(terminal.id, terminal.init, state); |
| 499 | if (init.kind === 'replace') { |
| 500 | terminal.init = init.value; |
| 501 | } |
| 502 | const test = this.transformValue(terminal.id, terminal.test, state); |
| 503 | if (test.kind === 'replace') { |
| 504 | terminal.test = test.value; |
| 505 | } |
| 506 | this.visitBlock(terminal.loop, state); |
| 507 | break; |
| 508 | } |
| 509 | case 'for-in': { |
| 510 | const init = this.transformValue(terminal.id, terminal.init, state); |
| 511 | if (init.kind === 'replace') { |
| 512 | terminal.init = init.value; |
| 513 | } |
| 514 | this.visitBlock(terminal.loop, state); |
| 515 | break; |
| 516 | } |
| 517 | case 'do-while': { |
| 518 | this.visitBlock(terminal.loop, state); |
| 519 | const test = this.transformValue(terminal.id, terminal.test, state); |
| 520 | if (test.kind === 'replace') { |
| 521 | terminal.test = test.value; |
| 522 | } |
| 523 | break; |
| 524 | } |
| 525 | case 'while': { |
| 526 | const test = this.transformValue(terminal.id, terminal.test, state); |
| 527 | if (test.kind === 'replace') { |
| 528 | terminal.test = test.value; |
| 529 | } |
| 530 | this.visitBlock(terminal.loop, state); |
| 531 | break; |
| 532 | } |
| 533 | case 'if': { |
| 534 | this.visitPlace(terminal.id, terminal.test, state); |
| 535 | this.visitBlock(terminal.consequent, state); |
| 536 | if (terminal.alternate !== null) { |
| 537 | this.visitBlock(terminal.alternate, state); |
| 538 | } |
| 539 | break; |
| 540 | } |
| 541 | case 'switch': { |
| 542 | this.visitPlace(terminal.id, terminal.test, state); |
| 543 | for (const case_ of terminal.cases) { |
| 544 | if (case_.test !== null) { |
| 545 | this.visitPlace(terminal.id, case_.test, state); |
| 546 | } |
| 547 | if (case_.block !== undefined) { |
| 548 | this.visitBlock(case_.block, state); |
| 549 | } |
| 550 | } |
| 551 | break; |
| 552 | } |
| 553 | case 'label': { |
| 554 | this.visitBlock(terminal.block, state); |
| 555 | break; |
| 556 | } |
| 557 | case 'try': { |
| 558 | this.visitBlock(terminal.block, state); |
| 559 | if (terminal.handlerBinding !== null) { |
| 560 | this.visitPlace(terminal.id, terminal.handlerBinding, state); |
| 561 | } |
| 562 | this.visitBlock(terminal.handler, state); |
| 563 | break; |
| 564 | } |
| 565 | default: { |
| 566 | assertExhaustive( |
| 567 | terminal, |
| 568 | `Unexpected terminal kind \`${(terminal as any).kind}\``, |
| 569 | ); |
| 570 | } |
| 571 | } |
| 572 | } |
| 573 | } |
| 574 | |
| 575 | export function* eachReactiveValueOperand( |
| 576 | instrValue: ReactiveValue, |
| 577 | ): Iterable<Place> { |
| 578 | switch (instrValue.kind) { |
| 579 | case 'OptionalExpression': { |
| 580 | yield* eachReactiveValueOperand(instrValue.value); |
| 581 | break; |
| 582 | } |
| 583 | case 'LogicalExpression': { |
| 584 | yield* eachReactiveValueOperand(instrValue.left); |
| 585 | yield* eachReactiveValueOperand(instrValue.right); |
| 586 | break; |
| 587 | } |
| 588 | case 'SequenceExpression': { |
| 589 | for (const instr of instrValue.instructions) { |
| 590 | yield* eachReactiveValueOperand(instr.value); |
| 591 | } |
| 592 | yield* eachReactiveValueOperand(instrValue.value); |
| 593 | break; |
| 594 | } |
| 595 | case 'ConditionalExpression': { |
| 596 | yield* eachReactiveValueOperand(instrValue.test); |
| 597 | yield* eachReactiveValueOperand(instrValue.consequent); |
| 598 | yield* eachReactiveValueOperand(instrValue.alternate); |
| 599 | break; |
| 600 | } |
| 601 | default: { |
| 602 | yield* eachInstructionValueOperand(instrValue); |
| 603 | } |
| 604 | } |
| 605 | } |
| 606 | |
| 607 | export function mapTerminalBlocks( |
| 608 | terminal: ReactiveTerminal, |
| 609 | fn: (block: ReactiveBlock) => ReactiveBlock, |
| 610 | ): void { |
| 611 | switch (terminal.kind) { |
| 612 | case 'break': |
| 613 | case 'continue': |
| 614 | case 'return': |
| 615 | case 'throw': { |
| 616 | break; |
| 617 | } |
| 618 | case 'for': { |
| 619 | terminal.loop = fn(terminal.loop); |
| 620 | break; |
| 621 | } |
| 622 | case 'for-of': { |
| 623 | terminal.loop = fn(terminal.loop); |
| 624 | break; |
| 625 | } |
| 626 | case 'for-in': { |
| 627 | terminal.loop = fn(terminal.loop); |
| 628 | break; |
| 629 | } |
| 630 | case 'do-while': |
| 631 | case 'while': { |
| 632 | terminal.loop = fn(terminal.loop); |
| 633 | break; |
| 634 | } |
| 635 | case 'if': { |
| 636 | terminal.consequent = fn(terminal.consequent); |
| 637 | if (terminal.alternate !== null) { |
| 638 | terminal.alternate = fn(terminal.alternate); |
| 639 | } |
| 640 | break; |
| 641 | } |
| 642 | case 'switch': { |
| 643 | for (const case_ of terminal.cases) { |
| 644 | if (case_.block !== undefined) { |
| 645 | case_.block = fn(case_.block); |
| 646 | } |
| 647 | } |
| 648 | break; |
| 649 | } |
| 650 | case 'label': { |
| 651 | terminal.block = fn(terminal.block); |
| 652 | break; |
| 653 | } |
| 654 | case 'try': { |
| 655 | terminal.block = fn(terminal.block); |
| 656 | terminal.handler = fn(terminal.handler); |
| 657 | break; |
| 658 | } |
| 659 | default: { |
| 660 | assertExhaustive( |
| 661 | terminal, |
| 662 | `Unexpected terminal kind \`${(terminal as any).kind}\``, |
| 663 | ); |
| 664 | } |
| 665 | } |
| 666 | } |