| // Copyright Joyent, Inc. and other Node contributors. |
| // |
| // Permission is hereby granted, free of charge, to any person obtaining a |
| // copy of this software and associated documentation files (the |
| // "Software"), to deal in the Software without restriction, including |
| // without limitation the rights to use, copy, modify, merge, publish, |
| // distribute, sublicense, and/or sell copies of the Software, and to permit |
| // persons to whom the Software is furnished to do so, subject to the |
| // following conditions: |
| // |
| // The above copyright notice and this permission notice shall be included |
| // in all copies or substantial portions of the Software. |
| // |
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
| // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN |
| // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, |
| // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR |
| // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE |
| // USE OR OTHER DEALINGS IN THE SOFTWARE. |
| |
| module.exports = Stream; |
| |
| var EE = require('events').EventEmitter; |
| var inherits = require('inherits'); |
| |
| inherits(Stream, EE); |
| Stream.Readable = require('readable-stream/readable.js'); |
| Stream.Writable = require('readable-stream/writable.js'); |
| Stream.Duplex = require('readable-stream/duplex.js'); |
| Stream.Transform = require('readable-stream/transform.js'); |
| Stream.PassThrough = require('readable-stream/passthrough.js'); |
| |
| // Backwards-compat with node 0.4.x |
| Stream.Stream = Stream; |
| |
| |
| |
| // old-style streams. Note that the pipe method (the only relevant |
| // part of this class) is overridden in the Readable class. |
| |
| function Stream() { |
| EE.call(this); |
| } |
| |
| Stream.prototype.pipe = function(dest, options) { |
| var source = this; |
| |
| function ondata(chunk) { |
| if (dest.writable) { |
| if (false === dest.write(chunk) && source.pause) { |
| source.pause(); |
| } |
| } |
| } |
| |
| source.on('data', ondata); |
| |
| function ondrain() { |
| if (source.readable && source.resume) { |
| source.resume(); |
| } |
| } |
| |
| dest.on('drain', ondrain); |
| |
| // If the 'end' option is not supplied, dest.end() will be called when |
| // source gets the 'end' or 'close' events. Only dest.end() once. |
| if (!dest._isStdio && (!options || options.end !== false)) { |
| source.on('end', onend); |
| source.on('close', onclose); |
| } |
| |
| var didOnEnd = false; |
| function onend() { |
| if (didOnEnd) return; |
| didOnEnd = true; |
| |
| dest.end(); |
| } |
| |
| |
| function onclose() { |
| if (didOnEnd) return; |
| didOnEnd = true; |
| |
| if (typeof dest.destroy === 'function') dest.destroy(); |
| } |
| |
| // don't leave dangling pipes when there are errors. |
| function onerror(er) { |
| cleanup(); |
| if (EE.listenerCount(this, 'error') === 0) { |
| throw er; // Unhandled stream error in pipe. |
| } |
| } |
| |
| source.on('error', onerror); |
| dest.on('error', onerror); |
| |
| // remove all the event listeners that were added. |
| function cleanup() { |
| source.removeListener('data', ondata); |
| dest.removeListener('drain', ondrain); |
| |
| source.removeListener('end', onend); |
| source.removeListener('close', onclose); |
| |
| source.removeListener('error', onerror); |
| dest.removeListener('error', onerror); |
| |
| source.removeListener('end', cleanup); |
| source.removeListener('close', cleanup); |
| |
| dest.removeListener('close', cleanup); |
| } |
| |
| source.on('end', cleanup); |
| source.on('close', cleanup); |
| |
| dest.on('close', cleanup); |
| |
| dest.emit('pipe', source); |
| |
| // Allow for unix-like usage: A.pipe(B).pipe(C) |
| return dest; |
| }; |