1
|
var eos = require('end-of-stream')
|
2
|
var shift = require('stream-shift')
|
3
|
|
4
|
module.exports = each
|
5
|
|
6
|
function each (stream, fn, cb) {
|
7
|
var want = true
|
8
|
var error = null
|
9
|
var ended = false
|
10
|
var running = false
|
11
|
var calling = false
|
12
|
|
13
|
stream.on('readable', onreadable)
|
14
|
onreadable()
|
15
|
|
16
|
if (cb) eos(stream, {readable: true, writable: false}, done)
|
17
|
return stream
|
18
|
|
19
|
function done (err) {
|
20
|
if (!error) error = err
|
21
|
ended = true
|
22
|
if (!running) cb(error)
|
23
|
}
|
24
|
|
25
|
function onreadable () {
|
26
|
if (want) read()
|
27
|
}
|
28
|
|
29
|
function afterRead (err) {
|
30
|
running = false
|
31
|
|
32
|
if (err) {
|
33
|
error = err
|
34
|
if (ended) return cb(error)
|
35
|
stream.destroy(err)
|
36
|
return
|
37
|
}
|
38
|
if (ended) return cb(error)
|
39
|
if (!calling) read()
|
40
|
}
|
41
|
|
42
|
function read () {
|
43
|
while (!running && !ended) {
|
44
|
want = false
|
45
|
|
46
|
var data = shift(stream)
|
47
|
if (ended) return
|
48
|
if (data === null) {
|
49
|
want = true
|
50
|
return
|
51
|
}
|
52
|
|
53
|
running = true
|
54
|
calling = true
|
55
|
fn(data, afterRead)
|
56
|
calling = false
|
57
|
}
|
58
|
}
|
59
|
}
|