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
|
'use strict';
const common = require('../common');
const assert = require('assert');
const Readable = require('stream').Readable;
const readable = new Readable({
read(size) {}
});
const state = readable._readableState;
// Starting off with false initially.
assert.strictEqual(state.reading, false);
assert.strictEqual(state.readingMore, false);
readable.on('data', common.mustCall((data) => {
// while in a flowing state, should try to read more.
if (readable.readableFlowing)
assert.strictEqual(state.readingMore, true);
// reading as long as we've not ended
assert.strictEqual(state.reading, !state.ended);
}, 2));
function onStreamEnd() {
// End of stream; state.reading is false
// And so should be readingMore.
assert.strictEqual(state.readingMore, false);
assert.strictEqual(state.reading, false);
}
readable.on('readable', common.mustCall(() => {
// 'readable' always gets called before 'end'
// since 'end' hasn't been emitted, more data could be incoming
assert.strictEqual(state.readingMore, true);
// if the stream has ended, we shouldn't be reading
assert.strictEqual(state.ended, !state.reading);
const data = readable.read();
if (data === null) // reached end of stream
process.nextTick(common.mustCall(onStreamEnd, 1));
}, 2));
readable.on('end', common.mustCall(onStreamEnd));
readable.push('pushed');
// stop emitting 'data' events
readable.pause();
// read() should only be called while operating in paused mode
readable.read(6);
// reading
assert.strictEqual(state.reading, true);
assert.strictEqual(state.readingMore, true);
// resume emitting 'data' events
readable.resume();
// add chunk to front
readable.unshift('unshifted');
// end
readable.push(null);
|
