150 lines
4.0 KiB
JavaScript
150 lines
4.0 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.combine = combine;
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exports.combineArray = combineArray;
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var _Stream = require('../Stream');
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var _Stream2 = _interopRequireDefault(_Stream);
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var _transform = require('./transform');
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var transform = _interopRequireWildcard(_transform);
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var _core = require('../source/core');
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var core = _interopRequireWildcard(_core);
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var _Pipe = require('../sink/Pipe');
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var _Pipe2 = _interopRequireDefault(_Pipe);
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var _IndexSink = require('../sink/IndexSink');
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var _IndexSink2 = _interopRequireDefault(_IndexSink);
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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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/** @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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var map = base.map;
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var tail = base.tail;
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/**
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* Combine latest events from all input streams
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* @param {function(...events):*} f function to combine most recent events
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* @returns {Stream} stream containing the result of applying f to the most recent
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* event of each input stream, whenever a new event arrives on any stream.
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*/
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function combine(f /*, ...streams */) {
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return combineArray(f, tail(arguments));
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}
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/**
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* Combine latest events from all input streams
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* @param {function(...events):*} f function to combine most recent events
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* @param {[Stream]} streams most recent events
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* @returns {Stream} stream containing the result of applying f to the most recent
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* event of each input stream, whenever a new event arrives on any stream.
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*/
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function combineArray(f, streams) {
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var l = streams.length;
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return l === 0 ? core.empty() : l === 1 ? transform.map(f, streams[0]) : new _Stream2.default(combineSources(f, streams));
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}
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function combineSources(f, streams) {
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return new Combine(f, 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 Combine(f, sources) {
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this.f = f;
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this.sources = sources;
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}
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Combine.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);
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var sinks = new Array(l);
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var mergeSink = new CombineSink(disposables, sinks, sink, this.f);
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for (var indexSink, i = 0; i < l; ++i) {
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indexSink = sinks[i] = new _IndexSink2.default(i, mergeSink);
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disposables[i] = this$1.sources[i].run(indexSink, scheduler);
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}
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return dispose.all(disposables);
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};
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function CombineSink(disposables, sinks, sink, f) {
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var this$1 = this;
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this.sink = sink;
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this.disposables = disposables;
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this.sinks = sinks;
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this.f = f;
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var l = sinks.length;
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this.awaiting = l;
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this.values = new Array(l);
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this.hasValue = new Array(l);
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for (var i = 0; i < l; ++i) {
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this$1.hasValue[i] = false;
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}
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this.activeCount = sinks.length;
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}
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CombineSink.prototype.error = _Pipe2.default.prototype.error;
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CombineSink.prototype.event = function (t, indexedValue) {
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var i = indexedValue.index;
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var awaiting = this._updateReady(i);
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this.values[i] = indexedValue.value;
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if (awaiting === 0) {
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this.sink.event(t, (0, _invoke2.default)(this.f, this.values));
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}
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};
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CombineSink.prototype._updateReady = function (index) {
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if (this.awaiting > 0) {
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if (!this.hasValue[index]) {
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this.hasValue[index] = true;
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this.awaiting -= 1;
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}
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}
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return this.awaiting;
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};
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CombineSink.prototype.end = function (t, indexedValue) {
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dispose.tryDispose(t, this.disposables[indexedValue.index], this.sink);
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if (--this.activeCount === 0) {
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this.sink.end(t, indexedValue.value);
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}
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}; |