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codeql-action/node_modules/combined-stream/lib/combined_stream.js
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var util = require('util'); | |
var Stream = require('stream').Stream; | |
var DelayedStream = require('delayed-stream'); | |
module.exports = CombinedStream; | |
function CombinedStream() { | |
this.writable = false; | |
this.readable = true; | |
this.dataSize = 0; | |
this.maxDataSize = 2 * 1024 * 1024; | |
this.pauseStreams = true; | |
this._released = false; | |
this._streams = []; | |
this._currentStream = null; | |
this._insideLoop = false; | |
this._pendingNext = false; | |
} | |
util.inherits(CombinedStream, Stream); | |
CombinedStream.create = function(options) { | |
var combinedStream = new this(); | |
options = options || {}; | |
for (var option in options) { | |
combinedStream[option] = options[option]; | |
} | |
return combinedStream; | |
}; | |
CombinedStream.isStreamLike = function(stream) { | |
return (typeof stream !== 'function') | |
&& (typeof stream !== 'string') | |
&& (typeof stream !== 'boolean') | |
&& (typeof stream !== 'number') | |
&& (!Buffer.isBuffer(stream)); | |
}; | |
CombinedStream.prototype.append = function(stream) { | |
var isStreamLike = CombinedStream.isStreamLike(stream); | |
if (isStreamLike) { | |
if (!(stream instanceof DelayedStream)) { | |
var newStream = DelayedStream.create(stream, { | |
maxDataSize: Infinity, | |
pauseStream: this.pauseStreams, | |
}); | |
stream.on('data', this._checkDataSize.bind(this)); | |
stream = newStream; | |
} | |
this._handleErrors(stream); | |
if (this.pauseStreams) { | |
stream.pause(); | |
} | |
} | |
this._streams.push(stream); | |
return this; | |
}; | |
CombinedStream.prototype.pipe = function(dest, options) { | |
Stream.prototype.pipe.call(this, dest, options); | |
this.resume(); | |
return dest; | |
}; | |
CombinedStream.prototype._getNext = function() { | |
this._currentStream = null; | |
if (this._insideLoop) { | |
this._pendingNext = true; | |
return; // defer call | |
} | |
this._insideLoop = true; | |
try { | |
do { | |
this._pendingNext = false; | |
this._realGetNext(); | |
} while (this._pendingNext); | |
} finally { | |
this._insideLoop = false; | |
} | |
}; | |
CombinedStream.prototype._realGetNext = function() { | |
var stream = this._streams.shift(); | |
if (typeof stream == 'undefined') { | |
this.end(); | |
return; | |
} | |
if (typeof stream !== 'function') { | |
this._pipeNext(stream); | |
return; | |
} | |
var getStream = stream; | |
getStream(function(stream) { | |
var isStreamLike = CombinedStream.isStreamLike(stream); | |
if (isStreamLike) { | |
stream.on('data', this._checkDataSize.bind(this)); | |
this._handleErrors(stream); | |
} | |
this._pipeNext(stream); | |
}.bind(this)); | |
}; | |
CombinedStream.prototype._pipeNext = function(stream) { | |
this._currentStream = stream; | |
var isStreamLike = CombinedStream.isStreamLike(stream); | |
if (isStreamLike) { | |
stream.on('end', this._getNext.bind(this)); | |
stream.pipe(this, {end: false}); | |
return; | |
} | |
var value = stream; | |
this.write(value); | |
this._getNext(); | |
}; | |
CombinedStream.prototype._handleErrors = function(stream) { | |
var self = this; | |
stream.on('error', function(err) { | |
self._emitError(err); | |
}); | |
}; | |
CombinedStream.prototype.write = function(data) { | |
this.emit('data', data); | |
}; | |
CombinedStream.prototype.pause = function() { | |
if (!this.pauseStreams) { | |
return; | |
} | |
if(this.pauseStreams && this._currentStream && typeof(this._currentStream.pause) == 'function') this._currentStream.pause(); | |
this.emit('pause'); | |
}; | |
CombinedStream.prototype.resume = function() { | |
if (!this._released) { | |
this._released = true; | |
this.writable = true; | |
this._getNext(); | |
} | |
if(this.pauseStreams && this._currentStream && typeof(this._currentStream.resume) == 'function') this._currentStream.resume(); | |
this.emit('resume'); | |
}; | |
CombinedStream.prototype.end = function() { | |
this._reset(); | |
this.emit('end'); | |
}; | |
CombinedStream.prototype.destroy = function() { | |
this._reset(); | |
this.emit('close'); | |
}; | |
CombinedStream.prototype._reset = function() { | |
this.writable = false; | |
this._streams = []; | |
this._currentStream = null; | |
}; | |
CombinedStream.prototype._checkDataSize = function() { | |
this._updateDataSize(); | |
if (this.dataSize <= this.maxDataSize) { | |
return; | |
} | |
var message = | |
'DelayedStream#maxDataSize of ' + this.maxDataSize + ' bytes exceeded.'; | |
this._emitError(new Error(message)); | |
}; | |
CombinedStream.prototype._updateDataSize = function() { | |
this.dataSize = 0; | |
var self = this; | |
this._streams.forEach(function(stream) { | |
if (!stream.dataSize) { | |
return; | |
} | |
self.dataSize += stream.dataSize; | |
}); | |
if (this._currentStream && this._currentStream.dataSize) { | |
this.dataSize += this._currentStream.dataSize; | |
} | |
}; | |
CombinedStream.prototype._emitError = function(err) { | |
this._reset(); | |
this.emit('error', err); | |
}; |