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1 files changed, 105 insertions, 0 deletions

diff --git a/node_modules/parallel-transform/index.js b/node_modules/parallel-transform/index.js
new file mode 100644
index 00000000..77329e4c
--- /dev/null
+++ b/node_modules/parallel-transform/index.js
@@ -0,0 +1,105 @@
+var Transform = require('readable-stream').Transform;
+var inherits = require('inherits');
+var cyclist = require('cyclist');
+var util = require('util');
+
+var ParallelTransform = function(maxParallel, opts, ontransform) {
+	if (!(this instanceof ParallelTransform)) return new ParallelTransform(maxParallel, opts, ontransform);
+
+	if (typeof maxParallel === 'function') {
+		ontransform = maxParallel;
+		opts = null;
+		maxParallel = 1;
+	}
+	if (typeof opts === 'function') {
+		ontransform = opts;
+		opts = null;
+	}
+
+	if (!opts) opts = {};
+	if (!opts.highWaterMark) opts.highWaterMark = Math.max(maxParallel, 16);
+	if (opts.objectMode !== false) opts.objectMode = true;
+
+	Transform.call(this, opts);
+
+	this._maxParallel = maxParallel;
+	this._ontransform = ontransform;
+	this._destroyed = false;
+	this._flushed = false;
+	this._ordered = opts.ordered !== false;
+	this._buffer = this._ordered ? cyclist(maxParallel) : [];
+	this._top = 0;
+	this._bottom = 0;
+	this._ondrain = null;
+};
+
+inherits(ParallelTransform, Transform);
+
+ParallelTransform.prototype.destroy = function() {
+	if (this._destroyed) return;
+	this._destroyed = true;
+	this.emit('close');
+};
+
+ParallelTransform.prototype._transform = function(chunk, enc, callback) {
+	var self = this;
+	var pos = this._top++;
+
+	this._ontransform(chunk, function(err, data) {
+		if (self._destroyed) return;
+		if (err) {
+			self.emit('error', err);
+			self.push(null);
+			self.destroy();
+			return;
+		}
+		if (self._ordered) {
+			self._buffer.put(pos, (data === undefined || data === null) ? null : data);
+		}
+		else {
+			self._buffer.push(data);
+		}
+		self._drain();
+	});
+
+	if (this._top - this._bottom < this._maxParallel) return callback();
+	this._ondrain = callback;
+};
+
+ParallelTransform.prototype._flush = function(callback) {
+	this._flushed = true;
+	this._ondrain = callback;
+	this._drain();
+};
+
+ParallelTransform.prototype._drain = function() {
+	if (this._ordered) {
+		while (this._buffer.get(this._bottom) !== undefined) {
+			var data = this._buffer.del(this._bottom++);
+			if (data === null) continue;
+			this.push(data);
+		}
+	}
+	else {
+		while (this._buffer.length > 0) {
+			var data =  this._buffer.pop();
+			this._bottom++;
+			if (data === null) continue;
+			this.push(data);
+		}
+	}
+
+
+	if (!this._drained() || !this._ondrain) return;
+
+	var ondrain = this._ondrain;
+	this._ondrain = null;
+	ondrain();
+};
+
+ParallelTransform.prototype._drained = function() {
+	var diff = this._top - this._bottom;
+	return this._flushed ? !diff : diff < this._maxParallel;
+};
+
+module.exports = ParallelTransform;