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The copyright and license notice is already in the LICENSE file. There is no justifiable reason to also require that it be included in every file, since the individual files are not individually distributed except as part of the entire package.
109 lines
2.4 KiB
JavaScript
109 lines
2.4 KiB
JavaScript
'use strict';
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module.exports = Stream;
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var EE = require('events').EventEmitter;
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var util = require('util');
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util.inherits(Stream, EE);
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Stream.Readable = require('_stream_readable');
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Stream.Writable = require('_stream_writable');
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Stream.Duplex = require('_stream_duplex');
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Stream.Transform = require('_stream_transform');
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Stream.PassThrough = require('_stream_passthrough');
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// Backwards-compat with node 0.4.x
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Stream.Stream = Stream;
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// old-style streams. Note that the pipe method (the only relevant
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// part of this class) is overridden in the Readable class.
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function Stream() {
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EE.call(this);
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}
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Stream.prototype.pipe = function(dest, options) {
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var source = this;
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function ondata(chunk) {
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if (dest.writable) {
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if (false === dest.write(chunk) && source.pause) {
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source.pause();
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}
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}
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}
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source.on('data', ondata);
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function ondrain() {
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if (source.readable && source.resume) {
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source.resume();
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}
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}
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dest.on('drain', ondrain);
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// If the 'end' option is not supplied, dest.end() will be called when
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// source gets the 'end' or 'close' events. Only dest.end() once.
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if (!dest._isStdio && (!options || options.end !== false)) {
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source.on('end', onend);
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source.on('close', onclose);
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}
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var didOnEnd = false;
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function onend() {
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if (didOnEnd) return;
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didOnEnd = true;
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dest.end();
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}
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function onclose() {
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if (didOnEnd) return;
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didOnEnd = true;
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if (util.isFunction(dest.destroy)) dest.destroy();
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}
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// don't leave dangling pipes when there are errors.
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function onerror(er) {
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cleanup();
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if (EE.listenerCount(this, 'error') === 0) {
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throw er; // Unhandled stream error in pipe.
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}
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}
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source.on('error', onerror);
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dest.on('error', onerror);
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// remove all the event listeners that were added.
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function cleanup() {
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source.removeListener('data', ondata);
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dest.removeListener('drain', ondrain);
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source.removeListener('end', onend);
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source.removeListener('close', onclose);
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source.removeListener('error', onerror);
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dest.removeListener('error', onerror);
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source.removeListener('end', cleanup);
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source.removeListener('close', cleanup);
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dest.removeListener('close', cleanup);
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}
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source.on('end', cleanup);
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source.on('close', cleanup);
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dest.on('close', cleanup);
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dest.emit('pipe', source);
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// Allow for unix-like usage: A.pipe(B).pipe(C)
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return dest;
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};
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