Function AsyncGenerator

docs/app/js/sanddance-app.js:54353–54413

(gen)

var _awaitValueJs = require("./AwaitValue.js");
var _awaitValueJsDefault = parcelHelpers.interopDefault(_awaitValueJs);
function AsyncGenerator(gen) {
    var front, back;
    function send(key, arg) {
        return new Promise(function(resolve, reject) {
            var request = {
                key: key,
                arg: arg,
                resolve: resolve,
                reject: reject,
                next: null
            };
            if (back) back = back.next = request;
            else {
                front = back = request;
                resume(key, arg);
            }
        });
    }
    function resume(key, arg1) {
        try {
            var result = gen[key](arg1);
            var value = result.value;
            var wrappedAwait = value instanceof (0, _awaitValueJsDefault.default);
            Promise.resolve(wrappedAwait ? value.wrapped : value).then(function(arg) {
                if (wrappedAwait) {
                    resume(key === "return" ? "return" : "next", arg);
                    return;
                }
                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: true
                });
                break;
            case "throw":
                front.reject(value);
                break;
            default:
                front.resolve({
                    value: value,
                    done: false
                });
                break;
        }
        front = front.next;
        if (front) resume(front.key, front.arg);
        else back = null;
    }