42 lines
896 B
JavaScript
42 lines
896 B
JavaScript
|
'use strict'
|
||
|
|
const stream = require('stream')
|
||
|
|
|
||
|
|
const numbers = new Array(1000).join(',').split(',').map((v, k) => k)
|
||
|
|
let acc = ''
|
||
|
|
const strings = numbers.map(n => acc += n)
|
||
|
|
const bufs = strings.map(s => new Buffer(s))
|
||
|
|
const objs = strings.map(s => ({ str: s }))
|
||
|
|
|
||
|
|
module.exports = class Numbers {
|
||
|
|
constructor (opt) {
|
||
|
|
this.objectMode = opt.objectMode
|
||
|
|
this.encoding = opt.encoding
|
||
|
|
this.ii = 0
|
||
|
|
this.done = false
|
||
|
|
}
|
||
|
|
pipe (dest) {
|
||
|
|
this.dest = dest
|
||
|
|
this.go()
|
||
|
|
return dest
|
||
|
|
}
|
||
|
|
|
||
|
|
go () {
|
||
|
|
let flowing = true
|
||
|
|
while (flowing) {
|
||
|
|
if (this.ii >= 1000) {
|
||
|
|
this.dest.end()
|
||
|
|
this.done = true
|
||
|
|
flowing = false
|
||
|
|
} else {
|
||
|
|
flowing = this.dest.write(
|
||
|
|
(this.objectMode ? objs
|
||
|
|
: this.encoding ? strings
|
||
|
|
: bufs)[this.ii++])
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!this.done)
|
||
|
|
this.dest.once('drain', _ => this.go())
|
||
|
|
}
|
||
|
|
}
|