128 lines
3.3 KiB
JavaScript
128 lines
3.3 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.switch = undefined;
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exports.switchLatest = switchLatest;
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var _Stream = require('../Stream');
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var _Stream2 = _interopRequireDefault(_Stream);
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var _dispose = require('../disposable/dispose');
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var dispose = _interopRequireWildcard(_dispose);
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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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* Given a stream of streams, return a new stream that adopts the behavior
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* of the most recent inner stream.
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* @param {Stream} stream of streams on which to switch
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* @returns {Stream} switching stream
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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 switchLatest(stream) {
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return new _Stream2.default(new Switch(stream.source));
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}
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exports.switch = switchLatest;
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function Switch(source) {
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this.source = source;
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}
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Switch.prototype.run = function (sink, scheduler) {
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var switchSink = new SwitchSink(sink, scheduler);
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return dispose.all([switchSink, this.source.run(switchSink, scheduler)]);
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};
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function SwitchSink(sink, scheduler) {
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this.sink = sink;
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this.scheduler = scheduler;
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this.current = null;
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this.ended = false;
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}
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SwitchSink.prototype.event = function (t, stream) {
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this._disposeCurrent(t); // TODO: capture the result of this dispose
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this.current = new Segment(t, Infinity, this, this.sink);
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this.current.disposable = stream.source.run(this.current, this.scheduler);
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};
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SwitchSink.prototype.end = function (t, x) {
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this.ended = true;
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this._checkEnd(t, x);
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};
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SwitchSink.prototype.error = function (t, e) {
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this.ended = true;
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this.sink.error(t, e);
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};
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SwitchSink.prototype.dispose = function () {
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return this._disposeCurrent(this.scheduler.now());
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};
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SwitchSink.prototype._disposeCurrent = function (t) {
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if (this.current !== null) {
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return this.current._dispose(t);
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}
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};
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SwitchSink.prototype._disposeInner = function (t, inner) {
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inner._dispose(t); // TODO: capture the result of this dispose
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if (inner === this.current) {
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this.current = null;
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}
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};
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SwitchSink.prototype._checkEnd = function (t, x) {
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if (this.ended && this.current === null) {
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this.sink.end(t, x);
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}
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};
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SwitchSink.prototype._endInner = function (t, x, inner) {
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this._disposeInner(t, inner);
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this._checkEnd(t, x);
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};
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SwitchSink.prototype._errorInner = function (t, e, inner) {
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this._disposeInner(t, inner);
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this.sink.error(t, e);
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};
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function Segment(min, max, outer, sink) {
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this.min = min;
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this.max = max;
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this.outer = outer;
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this.sink = sink;
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this.disposable = dispose.empty();
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}
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Segment.prototype.event = function (t, x) {
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if (t < this.max) {
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this.sink.event(Math.max(t, this.min), x);
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}
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};
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Segment.prototype.end = function (t, x) {
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this.outer._endInner(Math.max(t, this.min), x, this);
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};
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Segment.prototype.error = function (t, e) {
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this.outer._errorInner(Math.max(t, this.min), e, this);
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};
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Segment.prototype._dispose = function (t) {
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this.max = t;
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dispose.tryDispose(t, this.disposable, this.sink);
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}; |