axax/esnext/spanAll.js

A library of async iterator extensions for JavaScript including ```map```, ```reduce```, ```filter```, ```flatMap```, ```pipe``` and [more](https://github.com/jamiemccrindle/axax/blob/master/docs/API.md#functions).

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const subject_1 = require("./subject");
const toCallbacks_1 = require("./toCallbacks");
function spanAll(predicate) {
    return function inner(source) {
        let done = false;
        const spanSubject = new subject_1.Subject();
        spanSubject.finally(() => {
            done = true;
        });
        let currentSubject = new subject_1.Subject();
        spanSubject.onNext(currentSubject.iterator);
        toCallbacks_1.toCallbacks(result => {
            if (done) {
                throw new toCallbacks_1.StopError();
            }
            if (result.done) {
                currentSubject.onCompleted();
                spanSubject.onCompleted();
                return Promise.resolve();
            }
            if (predicate(result.value)) {
                currentSubject.onCompleted();
                currentSubject = new subject_1.Subject();
                spanSubject.onNext(currentSubject.iterator);
            }
            else {
                currentSubject.onNext(result.value);
            }
            // not handling back pressure at the moment
            return Promise.resolve();
        })(source);
        return spanSubject.iterator;
    };
}
exports.spanAll = spanAll;