73 lines
2.1 KiB
JavaScript
73 lines
2.1 KiB
JavaScript
//---------------------------------------------------------------------------
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// @syndicate-lang/driver-streams-node, Stream support for Syndicate/js
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// Copyright (C) 2016-2018 Tony Garnock-Jones <tonyg@leastfixedpoint.com>
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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//---------------------------------------------------------------------------
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// Just enough functionality to make a pair of Readable/Writable
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// streams appear to be a Duplex stream from the POV of the Syndicate
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// driver in this package.
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const util = require('util');
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const events = require('events');
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function Duplex(r, w) {
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this.r = r;
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this.w = w;
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}
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Duplex.prototype.on = function (evt, cb) {
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switch (evt) {
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case 'readable':
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case 'end':
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this.r.on(evt, cb);
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break;
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case 'drain':
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this.w.on(evt, cb);
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break;
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case 'close':
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case 'error':
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this.r.on(evt, cb);
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this.w.on(evt, cb);
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break;
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default: throw new Error("Duplex: unsupported event: " + evt);
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}
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return this;
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};
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function proxyProp(name, target) {
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Object.defineProperty(Duplex.prototype, name, {
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configurable: true,
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enumerable: true,
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get: function () { return this[target][name]; }
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});
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}
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proxyProp('readableLength', 'r');
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proxyProp('writableLength', 'w');
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proxyProp('writableHighWaterMark', 'w');
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Duplex.prototype.read = function (size) {
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return this.r.read(size);
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};
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Duplex.prototype.write = function (chunk, cb) {
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return this.w.write(chunk, cb);
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};
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util.inherits(Duplex, events.EventEmitter);
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module.exports = Duplex;
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