rxjs-consecutive-operator/consecutive.js

RxJS operator for mapping multiple consecutively emitted values at once

"use strict";
var __extends = (this && this.__extends) || (function () {
    var extendStatics = Object.setPrototypeOf ||
        ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
        function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
    return function (d, b) {
        extendStatics(d, b);
        function __() { this.constructor = d; }
        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
    };
})();
exports.__esModule = true;
var rxjs_1 = require("rxjs");
function consecutive(observable, operator, numberOfConsecutiveValues) {
    var n = getNumberOfConsecutiveValuesToObserve(operator, numberOfConsecutiveValues);
    return observable.lift(new ConsecutiveOperator(operator, n));
}
exports.consecutive = consecutive;
function getNumberOfConsecutiveValuesToObserve(operator, numberOfConsecutiveValues) {
    var n;
    if (numberOfConsecutiveValues != null) {
        n = numberOfConsecutiveValues;
    }
    else {
        if (operator.length === 0) {
            throw new Error('consecutive: could not determine how many values provided operator accepts');
        }
        else {
            n = operator.length;
        }
    }
    return n;
}
var ConsecutiveOperator = (function () {
    function ConsecutiveOperator(operator, numberOfConsecutiveValues) {
        this.operator = operator;
        this.numberOfConsecutiveValues = numberOfConsecutiveValues;
    }
    ConsecutiveOperator.prototype.call = function (subscriber, source) {
        source.subscribe(new ConsecutiveSubscriber(subscriber, this.operator, this.numberOfConsecutiveValues));
    };
    return ConsecutiveOperator;
}());
var ConsecutiveSubscriber = (function (_super) {
    __extends(ConsecutiveSubscriber, _super);
    function ConsecutiveSubscriber(destination, operator, numberOfConsecutiveValues) {
        var _this = _super.call(this, destination) || this;
        _this.destination = destination;
        _this.operator = operator;
        _this.numberOfConsecutiveValues = numberOfConsecutiveValues;
        _this.valuesBuffer = [];
        return _this;
    }
    ConsecutiveSubscriber.prototype._next = function (value) {
        this.valuesBuffer.push(value);
        if (this.valuesBuffer.length === this.numberOfConsecutiveValues) {
            this.destination.next(this.operator.apply(this, this.valuesBuffer));
            this.valuesBuffer.shift();
        }
    };
    return ConsecutiveSubscriber;
}(rxjs_1.Subscriber));