dotfiles/.vscode/extensions/saviorisdead.RustyCode-0.18.0/node_modules/from/index.js
Cyryl Płotnicki 2f946d6200 Add .vscode
2016-09-11 10:29:13 +02:00

68 lines
1.4 KiB
JavaScript

'use strict';
var Stream = require('stream')
// from
//
// a stream that reads from an source.
// source may be an array, or a function.
// from handles pause behaviour for you.
module.exports =
function from (source) {
if(Array.isArray(source)) {
source = source.slice()
return from (function (i) {
if(source.length)
this.emit('data', source.shift())
else
this.emit('end')
return true
})
}
var s = new Stream(), i = 0
s.ended = false
s.started = false
s.readable = true
s.writable = false
s.paused = false
s.ended = false
s.pause = function () {
s.started = true
s.paused = true
}
function next () {
s.started = true
if(s.ended) return
while(!s.ended && !s.paused && source.call(s, i++, function () {
if(!s.ended && !s.paused)
next()
}))
;
}
s.resume = function () {
s.started = true
s.paused = false
next()
}
s.on('end', function () {
s.ended = true
s.readable = false
process.nextTick(s.destroy)
})
s.destroy = function () {
s.ended = true
s.emit('close')
}
/*
by default, the stream will start emitting at nextTick
if you want, you can pause it, after pipeing.
you can also resume before next tick, and that will also
work.
*/
process.nextTick(function () {
if(!s.started) s.resume()
})
return s
}