AsyncGenerator.js 2.2 KB

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  1. var _Promise = require("@babel/runtime-corejs3/core-js/promise");
  2. var _Symbol = require("@babel/runtime-corejs3/core-js/symbol");
  3. var _Symbol$asyncIterator = require("@babel/runtime-corejs3/core-js/symbol/async-iterator");
  4. var OverloadYield = require("./OverloadYield.js");
  5. function AsyncGenerator(gen) {
  6. var front, back;
  7. function resume(key, arg) {
  8. try {
  9. var result = gen[key](arg),
  10. value = result.value,
  11. overloaded = value instanceof OverloadYield;
  12. _Promise.resolve(overloaded ? value.v : value).then(function (arg) {
  13. if (overloaded) {
  14. var nextKey = "return" === key ? "return" : "next";
  15. if (!value.k || arg.done) return resume(nextKey, arg);
  16. arg = gen[nextKey](arg).value;
  17. }
  18. settle(result.done ? "return" : "normal", arg);
  19. }, function (err) {
  20. resume("throw", err);
  21. });
  22. } catch (err) {
  23. settle("throw", err);
  24. }
  25. }
  26. function settle(type, value) {
  27. switch (type) {
  28. case "return":
  29. front.resolve({
  30. value: value,
  31. done: !0
  32. });
  33. break;
  34. case "throw":
  35. front.reject(value);
  36. break;
  37. default:
  38. front.resolve({
  39. value: value,
  40. done: !1
  41. });
  42. }
  43. (front = front.next) ? resume(front.key, front.arg) : back = null;
  44. }
  45. this._invoke = function (key, arg) {
  46. return new _Promise(function (resolve, reject) {
  47. var request = {
  48. key: key,
  49. arg: arg,
  50. resolve: resolve,
  51. reject: reject,
  52. next: null
  53. };
  54. back ? back = back.next = request : (front = back = request, resume(key, arg));
  55. });
  56. }, "function" != typeof gen["return"] && (this["return"] = void 0);
  57. }
  58. AsyncGenerator.prototype["function" == typeof _Symbol && _Symbol$asyncIterator || "@@asyncIterator"] = function () {
  59. return this;
  60. }, AsyncGenerator.prototype.next = function (arg) {
  61. return this._invoke("next", arg);
  62. }, AsyncGenerator.prototype["throw"] = function (arg) {
  63. return this._invoke("throw", arg);
  64. }, AsyncGenerator.prototype["return"] = function (arg) {
  65. return this._invoke("return", arg);
  66. };
  67. module.exports = AsyncGenerator, module.exports.__esModule = true, module.exports["default"] = module.exports;