60 lines
1.0 KiB
JavaScript
60 lines
1.0 KiB
JavaScript
|
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
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|