| 1 | var Promise = require("./_").Promise;
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| 2 |
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| 3 | var tryErr = {};
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| 4 |
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| 5 | function tryCatch (step, key) {
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| 6 | try {
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| 7 | return step(key);
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| 8 | } catch (err) {
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| 9 | tryErr.err = err;
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| 10 | return tryErr;
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| 11 | }
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| 12 | }
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| 13 |
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| 14 | module.exports = function (generator) {
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| 15 | return function () {
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| 16 | var gen = generator.apply(this, arguments);
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| 17 |
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| 18 | function genNext (val) {
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| 19 | return step("next", val);
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| 20 | }
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| 21 |
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| 22 | function genThrow (val) {
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| 23 | return step("throw", val);
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| 24 | }
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| 25 |
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| 26 | function step (key, val) {
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| 27 | var info = gen[key](val);
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| 28 |
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| 29 | if (info.done) {
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| 30 | return Promise.resolve(info.value);
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| 31 | } else {
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| 32 | return Promise.resolve(info.value).then(genNext, genThrow);
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| 33 | }
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| 34 | }
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| 35 |
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| 36 | var ret = tryCatch(step, "next");
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| 37 |
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| 38 | if (ret === tryErr)
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| 39 | return Promise.reject(ret.err);
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| 40 | else
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| 41 | return ret;
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| 42 | };
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| 43 | };
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