iwmlib/lib/3rdparty/systemjs/babel-helpers/asyncGeneratorDelegate.js
2019-04-05 10:09:27 +02:00

51 lines
922 B
JavaScript

export default (function (inner, awaitWrap) {
var iter = {},
waiting = false;
function pump(key, value) {
waiting = true;
value = new Promise(function (resolve) {
resolve(inner[key](value));
});
return {
done: false,
value: awaitWrap(value)
};
}
;
if (typeof Symbol === "function" && Symbol.iterator) {
iter[Symbol.iterator] = function () {
return this;
};
}
iter.next = function (value) {
if (waiting) {
waiting = false;
return value;
}
return pump("next", value);
};
if (typeof inner.throw === "function") {
iter.throw = function (value) {
if (waiting) {
waiting = false;
throw value;
}
return pump("throw", value);
};
}
if (typeof inner.return === "function") {
iter.return = function (value) {
return pump("return", value);
};
}
return iter;
});