111 lines
3.2 KiB
JavaScript
111 lines
3.2 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.scan = scan;
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exports.reduce = reduce;
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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 _runSource = require('../runSource');
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var _dispose = require('../disposable/dispose');
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var dispose = _interopRequireWildcard(_dispose);
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var _PropagateTask = require('../scheduler/PropagateTask');
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var _PropagateTask2 = _interopRequireDefault(_PropagateTask);
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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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* Create a stream containing successive reduce results of applying f to
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* the previous reduce result and the current stream item.
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* @param {function(result:*, x:*):*} f reducer function
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* @param {*} initial initial value
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* @param {Stream} stream stream to scan
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* @returns {Stream} new stream containing successive reduce results
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*/
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function scan(f, initial, stream) {
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return new _Stream2.default(new Scan(f, initial, stream.source));
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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 Scan(f, z, source) {
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this.source = source;
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this.f = f;
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this.value = z;
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}
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Scan.prototype.run = function (sink, scheduler) {
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var d1 = scheduler.asap(_PropagateTask2.default.event(this.value, sink));
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var d2 = this.source.run(new ScanSink(this.f, this.value, sink), scheduler);
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return dispose.all([d1, d2]);
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};
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function ScanSink(f, z, sink) {
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this.f = f;
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this.value = z;
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this.sink = sink;
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}
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ScanSink.prototype.event = function (t, x) {
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var f = this.f;
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this.value = f(this.value, x);
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this.sink.event(t, this.value);
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};
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ScanSink.prototype.error = _Pipe2.default.prototype.error;
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ScanSink.prototype.end = _Pipe2.default.prototype.end;
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/**
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* Reduce a stream to produce a single result. Note that reducing an infinite
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* stream will return a Promise that never fulfills, but that may reject if an error
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* occurs.
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* @param {function(result:*, x:*):*} f reducer function
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* @param {*} initial initial value
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* @param {Stream} stream to reduce
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* @returns {Promise} promise for the file result of the reduce
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*/
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function reduce(f, initial, stream) {
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return (0, _runSource.withDefaultScheduler)(new Reduce(f, initial, stream.source));
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}
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function Reduce(f, z, source) {
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this.source = source;
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this.f = f;
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this.value = z;
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}
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Reduce.prototype.run = function (sink, scheduler) {
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return this.source.run(new ReduceSink(this.f, this.value, sink), scheduler);
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};
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function ReduceSink(f, z, sink) {
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this.f = f;
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this.value = z;
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this.sink = sink;
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}
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ReduceSink.prototype.event = function (t, x) {
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var f = this.f;
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this.value = f(this.value, x);
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this.sink.event(t, this.value);
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};
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ReduceSink.prototype.error = _Pipe2.default.prototype.error;
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ReduceSink.prototype.end = function (t) {
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this.sink.end(t, this.value);
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}; |