89 lines
2.4 KiB
JavaScript
89 lines
2.4 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.filter = filter;
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exports.skipRepeats = skipRepeats;
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exports.skipRepeatsWith = skipRepeatsWith;
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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 _Filter = require('../fusion/Filter');
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var _Filter2 = _interopRequireDefault(_Filter);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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/**
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* Retain only items matching a predicate
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* @param {function(x:*):boolean} p filtering predicate called for each item
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* @param {Stream} stream stream to filter
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* @returns {Stream} stream containing only items for which predicate returns truthy
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*/
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function filter(p, stream) {
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return new _Stream2.default(_Filter2.default.create(p, stream.source));
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}
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/**
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* Skip repeated events, using === to detect duplicates
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* @param {Stream} stream stream from which to omit repeated events
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* @returns {Stream} stream without repeated events
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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 skipRepeats(stream) {
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return skipRepeatsWith(same, stream);
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}
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/**
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* Skip repeated events using the provided equals function to detect duplicates
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* @param {function(a:*, b:*):boolean} equals optional function to compare items
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* @param {Stream} stream stream from which to omit repeated events
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* @returns {Stream} stream without repeated events
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*/
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function skipRepeatsWith(equals, stream) {
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return new _Stream2.default(new SkipRepeats(equals, stream.source));
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}
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function SkipRepeats(equals, source) {
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this.equals = equals;
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this.source = source;
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}
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SkipRepeats.prototype.run = function (sink, scheduler) {
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return this.source.run(new SkipRepeatsSink(this.equals, sink), scheduler);
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};
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function SkipRepeatsSink(equals, sink) {
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this.equals = equals;
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this.sink = sink;
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this.value = void 0;
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this.init = true;
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}
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SkipRepeatsSink.prototype.end = _Pipe2.default.prototype.end;
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SkipRepeatsSink.prototype.error = _Pipe2.default.prototype.error;
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SkipRepeatsSink.prototype.event = function (t, x) {
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if (this.init) {
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this.init = false;
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this.value = x;
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this.sink.event(t, x);
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} else if (!this.equals(this.value, x)) {
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this.value = x;
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this.sink.event(t, x);
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}
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};
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function same(a, b) {
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return a === b;
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} |