2a09d1a4
 liuqimichale
添加宜春 天水 宣化
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var stream = require('readable-stream')
var inherits = require('inherits')
var SIGNAL_FLUSH =(Buffer.from && Buffer.from !== Uint8Array.from)
? Buffer.from([0])
: new Buffer([0])
module.exports = WriteStream
function WriteStream (opts, write, flush) {
if (!(this instanceof WriteStream)) return new WriteStream(opts, write, flush)
if (typeof opts === 'function') {
flush = write
write = opts
opts = {}
}
stream.Writable.call(this, opts)
this.destroyed = false
this._worker = write || null
this._flush = flush || null
}
inherits(WriteStream, stream.Writable)
WriteStream.obj = function (opts, worker, flush) {
if (typeof opts === 'function') return WriteStream.obj(null, opts, worker)
if (!opts) opts = {}
opts.objectMode = true
return new WriteStream(opts, worker, flush)
}
WriteStream.prototype._write = function (data, enc, cb) {
if (SIGNAL_FLUSH === data) this._flush(cb)
else this._worker(data, enc, cb)
}
WriteStream.prototype.end = function (data, enc, cb) {
if (!this._flush) return stream.Writable.prototype.end.apply(this, arguments)
if (typeof data === 'function') return this.end(null, null, data)
if (typeof enc === 'function') return this.end(data, null, enc)
if (data) this.write(data)
if (!this._writableState.ending) this.write(SIGNAL_FLUSH)
return stream.Writable.prototype.end.call(this, cb)
}
WriteStream.prototype.destroy = function (err) {
if (this.destroyed) return
this.destroyed = true
if (err) this.emit('error', err)
this.emit('close')
}
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