aaac7fed
 liuqimichale
add
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var eos = require('end-of-stream')
var shift = require('stream-shift')
module.exports = each
function each (stream, fn, cb) {
var want = true
var error = null
var ended = false
var running = false
var calling = false
stream.on('readable', onreadable)
onreadable()
if (cb) eos(stream, {readable: true, writable: false}, done)
return stream
function done (err) {
if (!error) error = err
ended = true
if (!running) cb(error)
}
function onreadable () {
if (want) read()
}
function afterRead (err) {
running = false
if (err) {
error = err
if (ended) return cb(error)
stream.destroy(err)
return
}
if (ended) return cb(error)
if (!calling) read()
}
function read () {
while (!running && !ended) {
want = false
var data = shift(stream)
if (ended) return
if (data === null) {
want = true
return
}
running = true
calling = true
fn(data, afterRead)
calling = false
}
}
}
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