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index.js
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index.js
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/*
* MIT License
*
* Copyright (c) 2016 Kyle E. Mitchell
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
* KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
* WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
module.exports = ArrayToStream
var Readable = require('readable-stream').Readable
var inherits = require('util').inherits
function ArrayToStream (array) {
if (!(this instanceof ArrayToStream)) {
return new ArrayToStream(array)
} else {
// Check for null in the array of objects.
var hasNull = array.some(function (element) {
return element === null
})
if (hasNull) {
throw new Error('Object streams cannot emit `null`')
}
// Create a shallow copy of the array with `null` at the end.
// This way:
// 1. `_read`'s calls to `.unshift()` don't mutate the argument.
// 2. `_read` will push `null`, the no-more-data value to end.
this._array = array.concat(null)
Readable.call(this, {objectMode: true})
}
}
inherits(ArrayToStream, Readable)
ArrayToStream.prototype._read = function () {
var array = this._array
while (array.length !== 0) {
if (!this.push(array.shift())) {
break
}
}
}