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1
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module.exports = shift
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2
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|
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3
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function shift (stream) {
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|
4
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var rs = stream._readableState
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|
5
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if (!rs) return null
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|
6
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return (rs.objectMode || typeof stream._duplexState === 'number') ? stream.read() : stream.read(getStateLength(rs))
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|
7
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}
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|
8
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|
|
9
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function getStateLength (state) {
|
|
10
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if (state.buffer.length) {
|
|
11
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// Since node 6.3.0 state.buffer is a BufferList not an array
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|
12
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if (state.buffer.head) {
|
|
13
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return state.buffer.head.data.length
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|
14
|
}
|
|
15
|
|
|
16
|
return state.buffer[0].length
|
|
17
|
}
|
|
18
|
|
|
19
|
return state.length
|
|
20
|
}
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