136 lines
3.6 KiB
JavaScript
136 lines
3.6 KiB
JavaScript
'use strict';
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.sample = sample;
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exports.sampleWith = sampleWith;
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exports.sampleArray = sampleArray;
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var _Stream = require('../Stream');
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var _Stream2 = _interopRequireDefault(_Stream);
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var _Pipe = require('../sink/Pipe');
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var _Pipe2 = _interopRequireDefault(_Pipe);
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var _dispose = require('../disposable/dispose');
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var dispose = _interopRequireWildcard(_dispose);
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var _prelude = require('@most/prelude');
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var base = _interopRequireWildcard(_prelude);
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var _invoke = require('../invoke');
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var _invoke2 = _interopRequireDefault(_invoke);
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function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { newObj[key] = obj[key]; } } } newObj.default = obj; return newObj; } }
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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/**
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* When an event arrives on sampler, emit the result of calling f with the latest
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* values of all streams being sampled
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* @param {function(...values):*} f function to apply to each set of sampled values
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* @param {Stream} sampler streams will be sampled whenever an event arrives
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* on sampler
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* @returns {Stream} stream of sampled and transformed values
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*/
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function sample(f, sampler /*, ...streams */) {
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return sampleArray(f, sampler, base.drop(2, arguments));
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}
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/**
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* When an event arrives on sampler, emit the latest event value from stream.
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* @param {Stream} sampler stream of events at whose arrival time
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* stream's latest value will be propagated
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* @param {Stream} stream stream of values
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* @returns {Stream} sampled stream of values
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*/
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/** @license MIT License (c) copyright 2010-2016 original author or authors */
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/** @author Brian Cavalier */
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/** @author John Hann */
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function sampleWith(sampler, stream) {
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return new _Stream2.default(new Sampler(base.id, sampler.source, [stream.source]));
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}
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function sampleArray(f, sampler, streams) {
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return new _Stream2.default(new Sampler(f, sampler.source, base.map(getSource, streams)));
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}
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function getSource(stream) {
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return stream.source;
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}
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function Sampler(f, sampler, sources) {
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this.f = f;
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this.sampler = sampler;
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this.sources = sources;
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}
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Sampler.prototype.run = function (sink, scheduler) {
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var this$1 = this;
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var l = this.sources.length;
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var disposables = new Array(l + 1);
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var sinks = new Array(l);
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var sampleSink = new SampleSink(this.f, sinks, sink);
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for (var hold, i = 0; i < l; ++i) {
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hold = sinks[i] = new Hold(sampleSink);
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disposables[i] = this$1.sources[i].run(hold, scheduler);
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}
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disposables[i] = this.sampler.run(sampleSink, scheduler);
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return dispose.all(disposables);
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};
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function Hold(sink) {
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this.sink = sink;
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this.hasValue = false;
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}
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Hold.prototype.event = function (t, x) {
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this.value = x;
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this.hasValue = true;
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this.sink._notify(this);
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};
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Hold.prototype.end = function () {};
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Hold.prototype.error = _Pipe2.default.prototype.error;
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function SampleSink(f, sinks, sink) {
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this.f = f;
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this.sinks = sinks;
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this.sink = sink;
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this.active = false;
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}
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SampleSink.prototype._notify = function () {
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if (!this.active) {
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this.active = this.sinks.every(hasValue);
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}
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};
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SampleSink.prototype.event = function (t) {
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if (this.active) {
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this.sink.event(t, (0, _invoke2.default)(this.f, base.map(getValue, this.sinks)));
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}
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};
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SampleSink.prototype.end = _Pipe2.default.prototype.end;
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SampleSink.prototype.error = _Pipe2.default.prototype.error;
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function hasValue(hold) {
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return hold.hasValue;
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}
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function getValue(hold) {
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return hold.value;
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} |