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