xstream/extra/sampleCombine.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var index_1 = require("../index");
var NO = {};
var SampleCombineListener = /** @class */ (function () {
    function SampleCombineListener(i, p) {
        this.i = i;
        this.p = p;
        p.ils[i] = this;
    }
    SampleCombineListener.prototype._n = function (t) {
        var p = this.p;
        if (p.out === NO)
            return;
        p.up(t, this.i);
    };
    SampleCombineListener.prototype._e = function (err) {
        this.p._e(err);
    };
    SampleCombineListener.prototype._c = function () {
        this.p.down(this.i, this);
    };
    return SampleCombineListener;
}());
exports.SampleCombineListener = SampleCombineListener;
var SampleCombineOperator = /** @class */ (function () {
    function SampleCombineOperator(ins, streams) {
        this.type = 'sampleCombine';
        this.ins = ins;
        this.others = streams;
        this.out = NO;
        this.ils = [];
        this.Nn = 0;
        this.vals = [];
    }
    SampleCombineOperator.prototype._start = function (out) {
        this.out = out;
        var s = this.others;
        var n = this.Nn = s.length;
        var vals = this.vals = new Array(n);
        for (var i = 0; i < n; i++) {
            vals[i] = NO;
            s[i]._add(new SampleCombineListener(i, this));
        }
        this.ins._add(this);
    };
    SampleCombineOperator.prototype._stop = function () {
        var s = this.others;
        var n = s.length;
        var ils = this.ils;
        this.ins._remove(this);
        for (var i = 0; i < n; i++) {
            s[i]._remove(ils[i]);
        }
        this.out = NO;
        this.vals = [];
        this.ils = [];
    };
    SampleCombineOperator.prototype._n = function (t) {
        var out = this.out;
        if (out === NO)
            return;
        if (this.Nn > 0)
            return;
        out._n([t].concat(this.vals));
    };
    SampleCombineOperator.prototype._e = function (err) {
        var out = this.out;
        if (out === NO)
            return;
        out._e(err);
    };
    SampleCombineOperator.prototype._c = function () {
        var out = this.out;
        if (out === NO)
            return;
        out._c();
    };
    SampleCombineOperator.prototype.up = function (t, i) {
        var v = this.vals[i];
        if (this.Nn > 0 && v === NO) {
            this.Nn--;
        }
        this.vals[i] = t;
    };
    SampleCombineOperator.prototype.down = function (i, l) {
        this.others[i]._remove(l);
    };
    return SampleCombineOperator;
}());
exports.SampleCombineOperator = SampleCombineOperator;
var sampleCombine;
/**
 *
 * Combines a source stream with multiple other streams. The result stream
 * will emit the latest events from all input streams, but only when the
 * source stream emits.
 *
 * If the source, or any input stream, throws an error, the result stream
 * will propagate the error. If any input streams end, their final emitted
 * value will remain in the array of any subsequent events from the result
 * stream.
 *
 * The result stream will only complete upon completion of the source stream.
 *
 * Marble diagram:
 *
 * ```text
 * --1----2-----3--------4--- (source)
 * ----a-----b-----c--d------ (other)
 *      sampleCombine
 * -------2a----3b-------4d--
 * ```
 *
 * Examples:
 *
 * ```js
 * import sampleCombine from 'xstream/extra/sampleCombine'
 * import xs from 'xstream'
 *
 * const sampler = xs.periodic(1000).take(3)
 * const other = xs.periodic(100)
 *
 * const stream = sampler.compose(sampleCombine(other))
 *
 * stream.addListener({
 *   next: i => console.log(i),
 *   error: err => console.error(err),
 *   complete: () => console.log('completed')
 * })
 * ```
 *
 * ```text
 * > [0, 8]
 * > [1, 18]
 * > [2, 28]
 * ```
 *
 * ```js
 * import sampleCombine from 'xstream/extra/sampleCombine'
 * import xs from 'xstream'
 *
 * const sampler = xs.periodic(1000).take(3)
 * const other = xs.periodic(100).take(2)
 *
 * const stream = sampler.compose(sampleCombine(other))
 *
 * stream.addListener({
 *   next: i => console.log(i),
 *   error: err => console.error(err),
 *   complete: () => console.log('completed')
 * })
 * ```
 *
 * ```text
 * > [0, 1]
 * > [1, 1]
 * > [2, 1]
 * ```
 *
 * @param {...Stream} streams One or more streams to combine with the sampler
 * stream.
 * @return {Stream}
 */
sampleCombine = function sampleCombine() {
    var streams = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        streams[_i] = arguments[_i];
    }
    return function sampleCombineOperator(sampler) {
        return new index_1.Stream(new SampleCombineOperator(sampler, streams));
    };
};
exports.default = sampleCombine;
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{InternalListener, Operator, Stream} from '../index';\n\nexport interface SampleCombineSignature {\n  (): <T>(s: Stream<T>) => Stream<[T]>;\n  <T1>(s1: Stream<T1>): <T>(s: Stream<T>) => Stream<[T, T1]>;\n  <T1, T2>(\n    s1: Stream<T1>,\n    s2: Stream<T2>): <T>(s: Stream<T>) => Stream<[T, T1, T2]>;\n  <T1, T2, T3>(\n    s1: Stream<T1>,\n    s2: Stream<T2>,\n    s3: Stream<T3>): <T>(s: Stream<T>) => Stream<[T, T1, T2, T3]>;\n  <T1, T2, T3, T4>(\n    s1: Stream<T1>,\n    s2: Stream<T2>,\n    s3: Stream<T3>,\n    s4: Stream<T4>): <T>(s: Stream<T>) => Stream<[T, T1, T2, T3, T4]>;\n  <T1, T2, T3, T4, T5>(\n    s1: Stream<T1>,\n    s2: Stream<T2>,\n    s3: Stream<T3>,\n    s4: Stream<T4>,\n    s5: Stream<T5>): <T>(s: Stream<T>) => Stream<[T, T1, T2, T3, T4, T5]>;\n  <T1, T2, T3, T4, T5, T6>(\n    s1: Stream<T1>,\n    s2: Stream<T2>,\n    s3: Stream<T3>,\n    s4: Stream<T4>,\n    s5: Stream<T5>,\n    s6: Stream<T6>): <T>(s: Stream<T>) => Stream<[T, T1, T2, T3, T4, T5, T6]>;\n  <T1, T2, T3, T4, T5, T6, T7>(\n    s1: Stream<T1>,\n    s2: Stream<T2>,\n    s3: Stream<T3>,\n    s4: Stream<T4>,\n    s5: Stream<T5>,\n    s6: Stream<T6>,\n    s7: Stream<T7>): <T>(s: Stream<T>) => Stream<[T, T1, T2, T3, T4, T5, T6, T7]>;\n  <T1, T2, T3, T4, T5, T6, T7, T8>(\n    s1: Stream<T1>,\n    s2: Stream<T2>,\n    s3: Stream<T3>,\n    s4: Stream<T4>,\n    s5: Stream<T5>,\n    s6: Stream<T6>,\n    s7: Stream<T7>,\n    s8: Stream<T8>): <T>(s: Stream<T>) => Stream<[T, T1, T2, T3, T4, T5, T6, T7, T8]>;\n  (...streams: Array<Stream<any>>): (s: Stream<any>) => Stream<Array<any>>;\n}\n\nconst NO = {};\n\nexport class SampleCombineListener<T> implements InternalListener<T> {\n  constructor(private i: number, private p: SampleCombineOperator<any>) {\n    p.ils[i] = this;\n  }\n\n  _n(t: T): void {\n    const p = this.p;\n    if (p.out === NO) return;\n    p.up(t, this.i);\n  }\n\n  _e(err: any): void {\n    this.p._e(err);\n  }\n\n  _c(): void {\n    this.p.down(this.i, this);\n  }\n}\n\nexport class SampleCombineOperator<T> implements Operator<T, Array<any>> {\n  public type = 'sampleCombine';\n  public ins: Stream<T>;\n  public others: Array<Stream<any>>;\n  public out: Stream<Array<any>>;\n  public ils: Array<SampleCombineListener<any>>;\n  public Nn: number; // *N*umber of streams still to send *n*ext\n  public vals: Array<any>;\n\n  constructor(ins: Stream<T>, streams: Array<Stream<any>>) {\n    this.ins = ins;\n    this.others = streams;\n    this.out = NO as Stream<Array<any>>;\n    this.ils = [];\n    this.Nn = 0;\n    this.vals = [];\n  }\n\n  _start(out: Stream<Array<any>>): void {\n    this.out = out;\n    const s = this.others;\n    const n = this.Nn = s.length;\n    const vals = this.vals = new Array(n);\n    for (let i = 0; i < n; i++) {\n      vals[i] = NO;\n      s[i]._add(new SampleCombineListener<any>(i, this));\n    }\n    this.ins._add(this);\n  }\n\n  _stop(): void {\n    const s = this.others;\n    const n = s.length;\n    const ils = this.ils;\n    this.ins._remove(this);\n    for (let i = 0; i < n; i++) {\n      s[i]._remove(ils[i]);\n    }\n    this.out = NO as Stream<Array<any>>;\n    this.vals = [];\n    this.ils = [];\n  }\n\n  _n(t: T): void {\n    const out = this.out;\n    if (out === NO) return;\n    if (this.Nn > 0) return;\n    out._n([t, ...this.vals]);\n  }\n\n  _e(err: any): void {\n    const out = this.out;\n    if (out === NO) return;\n    out._e(err);\n  }\n\n  _c(): void {\n    const out = this.out;\n    if (out === NO) return;\n    out._c();\n  }\n\n  up(t: any, i: number): void {\n    const v = this.vals[i];\n    if (this.Nn > 0 && v === NO) {\n      this.Nn--;\n    }\n    this.vals[i] = t;\n  }\n\n  down(i: number, l: SampleCombineListener<any>): void {\n    this.others[i]._remove(l);\n  }\n}\n\nlet sampleCombine: SampleCombineSignature;\n\n/**\n *\n * Combines a source stream with multiple other streams. The result stream\n * will emit the latest events from all input streams, but only when the\n * source stream emits.\n *\n * If the source, or any input stream, throws an error, the result stream\n * will propagate the error. If any input streams end, their final emitted\n * value will remain in the array of any subsequent events from the result\n * stream.\n *\n * The result stream will only complete upon completion of the source stream.\n *\n * Marble diagram:\n *\n * ```text\n * --1----2-----3--------4--- (source)\n * ----a-----b-----c--d------ (other)\n *      sampleCombine\n * -------2a----3b-------4d--\n * ```\n *\n * Examples:\n *\n * ```js\n * import sampleCombine from 'xstream/extra/sampleCombine'\n * import xs from 'xstream'\n *\n * const sampler = xs.periodic(1000).take(3)\n * const other = xs.periodic(100)\n *\n * const stream = sampler.compose(sampleCombine(other))\n *\n * stream.addListener({\n *   next: i => console.log(i),\n *   error: err => console.error(err),\n *   complete: () => console.log('completed')\n * })\n * ```\n *\n * ```text\n * > [0, 8]\n * > [1, 18]\n * > [2, 28]\n * ```\n *\n * ```js\n * import sampleCombine from 'xstream/extra/sampleCombine'\n * import xs from 'xstream'\n *\n * const sampler = xs.periodic(1000).take(3)\n * const other = xs.periodic(100).take(2)\n *\n * const stream = sampler.compose(sampleCombine(other))\n *\n * stream.addListener({\n *   next: i => console.log(i),\n *   error: err => console.error(err),\n *   complete: () => console.log('completed')\n * })\n * ```\n *\n * ```text\n * > [0, 1]\n * > [1, 1]\n * > [2, 1]\n * ```\n *\n * @param {...Stream} streams One or more streams to combine with the sampler\n * stream.\n * @return {Stream}\n */\nsampleCombine = function sampleCombine(...streams: Array<Stream<any>>) {\n  return function sampleCombineOperator(sampler: Stream<any>): Stream<Array<any>> {\n    return new Stream<Array<any>>(new SampleCombineOperator(sampler, streams));\n  };\n} as SampleCombineSignature;\n\nexport default sampleCombine;"]}