blue-iterate/dist/buffer.js

A collection of streams that work well with promises (through, map, reduce). Through2 with promise support

"use strict";
var __await = (this && this.__await) || function (v) { return this instanceof __await ? (this.v = v, this) : new __await(v); }
var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _arguments, generator) {
    if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
    var g = generator.apply(thisArg, _arguments || []), i, q = [];
    return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
    function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
    function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
    function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r);  }
    function fulfill(value) { resume("next", value); }
    function reject(value) { resume("throw", value); }
    function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
};
Object.defineProperty(exports, "__esModule", { value: true });
if (Symbol.asyncIterator === undefined) {
    (Symbol.asyncIterator) = Symbol.for('asyncIterator');
}
function _buffer(size, iterable) {
    return __asyncGenerator(this, arguments, function* _buffer_1() {
        const buff = [];
        for (let i = 0; i <= size; i++) {
            buff.push(iterable.next());
        }
        while (true) {
            const { value, end } = yield __await(buff.shift());
            if (!end) {
                yield value;
            }
            else {
                return;
            }
            buff.push(iterable.next());
        }
    });
}
function buffer(size, iterable) {
    if (iterable === undefined) {
        return curriedIterable => _buffer(size, curriedIterable);
    }
    return _buffer(size, iterable);
}
exports.buffer = buffer;