xstream
Version:
An extremely intuitive, small, and fast functional reactive stream library for JavaScript
109 lines • 8.6 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var index_1 = require("../index");
var SeparatorIL = /** @class */ (function () {
function SeparatorIL(out, op) {
this.out = out;
this.op = op;
}
SeparatorIL.prototype._n = function (_t) {
this.op.flush();
};
SeparatorIL.prototype._e = function (err) {
this.out._e(err);
};
SeparatorIL.prototype._c = function () {
this.op.flush();
this.out._c();
};
return SeparatorIL;
}());
var BufferOperator = /** @class */ (function () {
function BufferOperator(s, ins) {
this.s = s;
this.ins = ins;
this.type = 'buffer';
this.out = null;
this.acc = [];
}
BufferOperator.prototype.flush = function () {
if (this.acc.length > 0) {
this.out._n(this.acc);
this.acc = [];
}
};
BufferOperator.prototype._start = function (out) {
this.out = out;
this.ins._add(this);
this.sil = new SeparatorIL(out, this);
this.s._add(this.sil);
};
BufferOperator.prototype._stop = function () {
this.flush();
this.ins._remove(this);
this.out = null;
this.s._remove(this.sil);
this.sil = index_1.NO_IL;
};
BufferOperator.prototype._n = function (t) {
this.acc.push(t);
};
BufferOperator.prototype._e = function (err) {
var u = this.out;
if (!u)
return;
u._e(err);
};
BufferOperator.prototype._c = function () {
var out = this.out;
if (!out)
return;
this.flush();
out._c();
};
return BufferOperator;
}());
/**
* Buffers a stream using a separator stream. Returns a stream that emits
* arrays.
*
* Marble diagram:
*
* ```text
* --1--2--3--4--5--6--7--8--9|
* buffer( -a---------b---------c| )
* ---------[1,2,3]---[4,5,6]---[7,8,9]|
* ```
*
* Example:
*
* ```js
* import buffer from 'xstream/extra/buffer'
*
* const source = xs.periodic(50).take(10);
* const separator = xs.periodic(170).take(3);
* const buffered = source.compose(buffer(separator));
*
* buffered.addListener({
* next: arr => console.log(arr),
* error: err => console.error(err)
* });
* ```
*
* ```text
* > [0, 1, 2]
* > [3, 4, 5]
* > [6, 7, 8]
* ```
*
* @param {Stream} separator Some other stream that is used to know when to
* split the output stream.
* @return {Stream}
*/
function buffer(s) {
return function bufferOperator(ins) {
return new index_1.Stream(new BufferOperator(s, ins));
};
}
exports.default = buffer;
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