blob: f58ccf1dd61b13694cb10d858f032ccdd6024609 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
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;
|
