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