aaac7fed
 liuqimichale
add
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var Readable = require('readable-stream').Readable
var inherits = require('inherits')
module.exports = from2
from2.ctor = ctor
from2.obj = obj
var Proto = ctor()
function toFunction(list) {
list = list.slice()
return function (_, cb) {
var err = null
var item = list.length ? list.shift() : null
if (item instanceof Error) {
err = item
item = null
}
cb(err, item)
}
}
function from2(opts, read) {
if (typeof opts !== 'object' || Array.isArray(opts)) {
read = opts
opts = {}
}
var rs = new Proto(opts)
rs._from = Array.isArray(read) ? toFunction(read) : (read || noop)
return rs
}
function ctor(opts, read) {
if (typeof opts === 'function') {
read = opts
opts = {}
}
opts = defaults(opts)
inherits(Class, Readable)
function Class(override) {
if (!(this instanceof Class)) return new Class(override)
this._reading = false
this._callback = check
this.destroyed = false
Readable.call(this, override || opts)
var self = this
var hwm = this._readableState.highWaterMark
function check(err, data) {
if (self.destroyed) return
if (err) return self.destroy(err)
if (data === null) return self.push(null)
self._reading = false
if (self.push(data)) self._read(hwm)
}
}
Class.prototype._from = read || noop
Class.prototype._read = function(size) {
if (this._reading || this.destroyed) return
this._reading = true
this._from(size, this._callback)
}
Class.prototype.destroy = function(err) {
if (this.destroyed) return
this.destroyed = true
var self = this
process.nextTick(function() {
if (err) self.emit('error', err)
self.emit('close')
})
}
return Class
}
function obj(opts, read) {
if (typeof opts === 'function' || Array.isArray(opts)) {
read = opts
opts = {}
}
opts = defaults(opts)
opts.objectMode = true
opts.highWaterMark = 16
return from2(opts, read)
}
function noop () {}
function defaults(opts) {
opts = opts || {}
return opts
}
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