GeneratorResumeAbrupt.js 1.8 KB

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  1. 'use strict';
  2. var $TypeError = require('es-errors/type');
  3. var CompletionRecord = require('./CompletionRecord');
  4. var CreateIteratorResultObject = require('./CreateIteratorResultObject');
  5. var GeneratorValidate = require('./GeneratorValidate');
  6. var NormalCompletion = require('./NormalCompletion');
  7. var SLOT = require('internal-slot');
  8. // https://262.ecma-international.org/16.0/#sec-generatorresumeabrupt
  9. module.exports = function GeneratorResumeAbrupt(generator, abruptCompletion, generatorBrand) {
  10. if (
  11. !(abruptCompletion instanceof CompletionRecord)
  12. || (abruptCompletion.type() !== 'return' && abruptCompletion.type() !== 'throw')
  13. ) {
  14. throw new $TypeError('Assertion failed: abruptCompletion must be a `return` or `throw` Completion Record');
  15. }
  16. var state = GeneratorValidate(generator, generatorBrand); // step 1
  17. if (state === 'SUSPENDED-START') { // step 2
  18. SLOT.set(generator, '[[GeneratorState]]', 'COMPLETED'); // step 3.a
  19. SLOT.set(generator, '[[GeneratorContext]]', null); // step 3.b
  20. state = 'COMPLETED'; // step 3.c
  21. }
  22. var value = abruptCompletion.value();
  23. if (state === 'COMPLETED') { // step 3
  24. return CreateIteratorResultObject(value, true); // steps 3.a-b
  25. }
  26. if (state !== 'SUSPENDED-YIELD') {
  27. throw new $TypeError('Assertion failed: generator state is unexpected: ' + state); // step 4
  28. }
  29. if (abruptCompletion.type() === 'return') {
  30. // due to representing `GeneratorContext` as a function, we can't safely re-invoke it, so we can't support sending it a return completion
  31. return CreateIteratorResultObject(SLOT.get(generator, '[[CloseIfAbrupt]]')(NormalCompletion(abruptCompletion.value())), true);
  32. }
  33. var genContext = SLOT.get(generator, '[[GeneratorContext]]'); // step 5
  34. SLOT.set(generator, '[[GeneratorState]]', 'EXECUTING'); // step 8
  35. var result = genContext(value); // steps 6-7, 8-11
  36. return result; // step 12
  37. };