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var OverloadYield = require("./OverloadYield.js");
function AsyncGenerator(gen) {
var front, back;
function resume(key, arg) {
try {
var result = gen[key](arg),
value = result.value,
overloaded = value instanceof OverloadYield;
Promise.resolve(overloaded ? value.v : value).then(function (arg) {
if (overloaded) {
var nextKey = "return" === key ? "return" : "next";
if (!value.k || arg.done) return resume(nextKey, arg);
arg = gen[nextKey](arg).value;
}
settle(result.done ? "return" : "normal", arg);
}, function (err) {
resume("throw", err);
});
} catch (err) {
settle("throw", err);
}
}
function settle(type, value) {
switch (type) {
case "return":
front.resolve({
value: value,
done: !0
});
break;
case "throw":
front.reject(value);
break;
default:
front.resolve({
value: value,
done: !1
});
}
(front = front.next) ? resume(front.key, front.arg) : back = null;
}
this._invoke = function (key, arg) {
return new Promise(function (resolve, reject) {
var request = {
key: key,
arg: arg,
resolve: resolve,
reject: reject,
next: null
};
back ? back = back.next = request : (front = back = request, resume(key, arg));
});
}, "function" != typeof gen["return"] && (this["return"] = void 0);
}
AsyncGenerator.prototype["function" == typeof Symbol && Symbol.asyncIterator || "@@asyncIterator"] = function () {
return this;
}, AsyncGenerator.prototype.next = function (arg) {
return this._invoke("next", arg);
}, AsyncGenerator.prototype["throw"] = function (arg) {
return this._invoke("throw", arg);
}, AsyncGenerator.prototype["return"] = function (arg) {
return this._invoke("return", arg);
};
module.exports = AsyncGenerator, module.exports.__esModule = true, module.exports["default"] = module.exports;