add node_modules to address #4364

1 files changed, 87 insertions, 0 deletions

diff --git a/node_modules/ordered-read-streams/index.js b/node_modules/ordered-read-streams/index.js
new file mode 100644
index 000000000..f58ccf1dd
--- /dev/null
+++ b/node_modules/ordered-read-streams/index.js
@@ -0,0 +1,87 @@
+var Readable = require('stream').Readable;
+var util = require('util');
+
+
+function addStream(streams, stream)
+{
+  if(!stream.readable) throw new Error('All input streams must be readable');
+
+  if(this._readableState.ended) throw new Error('Adding streams after ended');
+
+
+  var self = this;
+
+  stream._buffer = [];
+
+  stream.on('data', function(chunk)
+  {
+    if(this === streams[0])
+      self.push(chunk);
+
+    else
+      this._buffer.push(chunk);
+  });
+
+  stream.on('end', function()
+  {
+    for(var stream = streams[0];
+        stream && stream._readableState.ended;
+        stream = streams[0])
+    {
+      while(stream._buffer.length)
+        self.push(stream._buffer.shift());
+
+      streams.shift();
+    }
+
+    if(!streams.length) self.push(null);
+  });
+
+  stream.on('error', this.emit.bind(this, 'error'));
+
+
+  streams.push(stream);
+}
+
+
+function OrderedStreams(streams, options) {
+  if (!(this instanceof(OrderedStreams))) {
+    return new OrderedStreams(streams, options);
+  }
+
+  streams = streams || [];
+  options = options || {};
+
+  options.objectMode = true;
+
+  Readable.call(this, options);
+
+
+  if(!Array.isArray(streams)) streams = [streams];
+  if(!streams.length) return this.push(null);  // no streams, close
+
+
+  var addStream_bind = addStream.bind(this, []);
+
+
+  this.concat = function()
+  {
+    Array.prototype.forEach.call(arguments, function(item)
+    {
+      if(Array.isArray(item))
+        item.forEach(addStream_bind);
+
+      else
+        addStream_bind(item);
+    });
+  };
+
+
+  this.concat(streams);
+}
+util.inherits(OrderedStreams, Readable);
+
+OrderedStreams.prototype._read = function () {};
+
+
+module.exports = OrderedStreams;