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## 2.1.0
- fix: issue where `clear()` is still keeping references to the elements (#47)
- refactor: performance optimizations for growth and array copy (#43)
- refactor: performance optimizations for toArray and fromArray (#46)
- test: add additional benchmarks for queue growth and `toArray` (#45)
## 2.0.1
- fix(types): incorrect return type on `size()`
## 2.0.0
- fix!: `push` & `unshift` now accept `undefined` values to match behaviour of `Array` (fixes #25) (#35)
- This is only a **BREAKING** change if you are currently expecting `push(undefined)` and `unshift(undefined)` to do
nothing - the new behaviour now correctly adds undefined values to the queue.
- **Note**: behaviour of `push()` & `unshift()` (no arguments) remains unchanged (nothing gets added to the queue).
- **Note**: If you need to differentiate between `undefined` values in the queue and the return value of `pop()` then
check the queue `.length` before popping.
- fix: incorrect methods in types definition file
## 1.5.1
- perf: minor performance tweak when growing queue size (#29)
## 1.5.0
- feat: adds capacity option for circular buffers (#27)

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<p align="center">
<h1 align="center">Denque</h1>
</p>
<p align="center">
<a href="https://www.npmjs.com/package/denque"><img src="https://img.shields.io/npm/dm/denque.svg?style=flat-square" alt="NPM downloads"></a>
<a href="https://www.npmjs.com/package/denque"><img src="https://img.shields.io/npm/v/denque.svg?style=flat-square" alt="NPM version"></a>
<a href="https://github.com/invertase/denque/actions/workflows/testing.yam"><img src="https://github.com/invertase/denque/actions/workflows/testing.yaml/badge.svg" alt="Tests status"></a>
<a href="https://codecov.io/gh/invertase/denque"><img src="https://codecov.io/gh/invertase/denque/branch/master/graph/badge.svg?token=rn91iI4bSe" alt="Coverage"></a>
<a href="/LICENSE"><img src="https://img.shields.io/npm/l/denque.svg?style=flat-square" alt="License"></a>
<a href="https://twitter.com/invertaseio"><img src="https://img.shields.io/twitter/follow/invertaseio.svg?style=social&label=Follow" alt="Follow on Twitter"></a>
</p>
Denque is a well tested, extremely fast and lightweight [double-ended queue](http://en.wikipedia.org/wiki/Double-ended_queue)
implementation with zero dependencies and includes TypeScript types.
Double-ended queues can also be used as a:
- [Stack](http://en.wikipedia.org/wiki/Stack_\(abstract_data_type\))
- [Queue](http://en.wikipedia.org/wiki/Queue_\(data_structure\))
This implementation is currently the fastest available, even faster than `double-ended-queue`, see the [benchmarks](https://docs.page/invertase/denque/benchmarks).
Every queue operation is done at a constant `O(1)` - including random access from `.peekAt(index)`.
**Works on all node versions >= v0.10**
## Quick Start
Install the package:
```bash
npm install denque
```
Create and consume a queue:
```js
const Denque = require("denque");
const denque = new Denque([1,2,3,4]);
denque.shift(); // 1
denque.pop(); // 4
```
See the [API reference documentation](https://docs.page/invertase/denque/api) for more examples.
---
## Who's using it?
- [Kafka Node.js client](https://www.npmjs.com/package/kafka-node)
- [MariaDB Node.js client](https://www.npmjs.com/package/mariadb)
- [MongoDB Node.js client](https://www.npmjs.com/package/mongodb)
- [MySQL Node.js client](https://www.npmjs.com/package/mysql2)
- [Redis Node.js clients](https://www.npmjs.com/package/redis)
... and [many more](https://www.npmjs.com/browse/depended/denque).
---
## License
- See [LICENSE](/LICENSE)
---
<p align="center">
<a href="https://invertase.io/?utm_source=readme&utm_medium=footer&utm_campaign=denque">
<img width="75px" src="https://static.invertase.io/assets/invertase/invertase-rounded-avatar.png">
</a>
<p align="center">
Built and maintained by <a href="https://invertase.io/?utm_source=readme&utm_medium=footer&utm_campaign=denque">Invertase</a>.
</p>
</p>

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declare class Denque<T = any> {
length: number;
constructor();
constructor(array: T[]);
constructor(array: T[], options: IDenqueOptions);
push(item: T): number;
unshift(item: T): number;
pop(): T | undefined;
shift(): T | undefined;
peekBack(): T | undefined;
peekFront(): T | undefined;
peekAt(index: number): T | undefined;
get(index: number): T | undefined;
remove(index: number, count: number): T[];
removeOne(index: number): T | undefined;
splice(index: number, count: number, ...item: T[]): T[] | undefined;
isEmpty(): boolean;
clear(): void;
size(): number;
toString(): string;
toArray(): T[];
}
interface IDenqueOptions {
capacity?: number
}
export = Denque;

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'use strict';
/**
* Custom implementation of a double ended queue.
*/
function Denque(array, options) {
var options = options || {};
this._capacity = options.capacity;
this._head = 0;
this._tail = 0;
if (Array.isArray(array)) {
this._fromArray(array);
} else {
this._capacityMask = 0x3;
this._list = new Array(4);
}
}
/**
* --------------
* PUBLIC API
* -------------
*/
/**
* Returns the item at the specified index from the list.
* 0 is the first element, 1 is the second, and so on...
* Elements at negative values are that many from the end: -1 is one before the end
* (the last element), -2 is two before the end (one before last), etc.
* @param index
* @returns {*}
*/
Denque.prototype.peekAt = function peekAt(index) {
var i = index;
// expect a number or return undefined
if ((i !== (i | 0))) {
return void 0;
}
var len = this.size();
if (i >= len || i < -len) return undefined;
if (i < 0) i += len;
i = (this._head + i) & this._capacityMask;
return this._list[i];
};
/**
* Alias for peekAt()
* @param i
* @returns {*}
*/
Denque.prototype.get = function get(i) {
return this.peekAt(i);
};
/**
* Returns the first item in the list without removing it.
* @returns {*}
*/
Denque.prototype.peek = function peek() {
if (this._head === this._tail) return undefined;
return this._list[this._head];
};
/**
* Alias for peek()
* @returns {*}
*/
Denque.prototype.peekFront = function peekFront() {
return this.peek();
};
/**
* Returns the item that is at the back of the queue without removing it.
* Uses peekAt(-1)
*/
Denque.prototype.peekBack = function peekBack() {
return this.peekAt(-1);
};
/**
* Returns the current length of the queue
* @return {Number}
*/
Object.defineProperty(Denque.prototype, 'length', {
get: function length() {
return this.size();
}
});
/**
* Return the number of items on the list, or 0 if empty.
* @returns {number}
*/
Denque.prototype.size = function size() {
if (this._head === this._tail) return 0;
if (this._head < this._tail) return this._tail - this._head;
else return this._capacityMask + 1 - (this._head - this._tail);
};
/**
* Add an item at the beginning of the list.
* @param item
*/
Denque.prototype.unshift = function unshift(item) {
if (arguments.length === 0) return this.size();
var len = this._list.length;
this._head = (this._head - 1 + len) & this._capacityMask;
this._list[this._head] = item;
if (this._tail === this._head) this._growArray();
if (this._capacity && this.size() > this._capacity) this.pop();
if (this._head < this._tail) return this._tail - this._head;
else return this._capacityMask + 1 - (this._head - this._tail);
};
/**
* Remove and return the first item on the list,
* Returns undefined if the list is empty.
* @returns {*}
*/
Denque.prototype.shift = function shift() {
var head = this._head;
if (head === this._tail) return undefined;
var item = this._list[head];
this._list[head] = undefined;
this._head = (head + 1) & this._capacityMask;
if (head < 2 && this._tail > 10000 && this._tail <= this._list.length >>> 2) this._shrinkArray();
return item;
};
/**
* Add an item to the bottom of the list.
* @param item
*/
Denque.prototype.push = function push(item) {
if (arguments.length === 0) return this.size();
var tail = this._tail;
this._list[tail] = item;
this._tail = (tail + 1) & this._capacityMask;
if (this._tail === this._head) {
this._growArray();
}
if (this._capacity && this.size() > this._capacity) {
this.shift();
}
if (this._head < this._tail) return this._tail - this._head;
else return this._capacityMask + 1 - (this._head - this._tail);
};
/**
* Remove and return the last item on the list.
* Returns undefined if the list is empty.
* @returns {*}
*/
Denque.prototype.pop = function pop() {
var tail = this._tail;
if (tail === this._head) return undefined;
var len = this._list.length;
this._tail = (tail - 1 + len) & this._capacityMask;
var item = this._list[this._tail];
this._list[this._tail] = undefined;
if (this._head < 2 && tail > 10000 && tail <= len >>> 2) this._shrinkArray();
return item;
};
/**
* Remove and return the item at the specified index from the list.
* Returns undefined if the list is empty.
* @param index
* @returns {*}
*/
Denque.prototype.removeOne = function removeOne(index) {
var i = index;
// expect a number or return undefined
if ((i !== (i | 0))) {
return void 0;
}
if (this._head === this._tail) return void 0;
var size = this.size();
var len = this._list.length;
if (i >= size || i < -size) return void 0;
if (i < 0) i += size;
i = (this._head + i) & this._capacityMask;
var item = this._list[i];
var k;
if (index < size / 2) {
for (k = index; k > 0; k--) {
this._list[i] = this._list[i = (i - 1 + len) & this._capacityMask];
}
this._list[i] = void 0;
this._head = (this._head + 1 + len) & this._capacityMask;
} else {
for (k = size - 1 - index; k > 0; k--) {
this._list[i] = this._list[i = (i + 1 + len) & this._capacityMask];
}
this._list[i] = void 0;
this._tail = (this._tail - 1 + len) & this._capacityMask;
}
return item;
};
/**
* Remove number of items from the specified index from the list.
* Returns array of removed items.
* Returns undefined if the list is empty.
* @param index
* @param count
* @returns {array}
*/
Denque.prototype.remove = function remove(index, count) {
var i = index;
var removed;
var del_count = count;
// expect a number or return undefined
if ((i !== (i | 0))) {
return void 0;
}
if (this._head === this._tail) return void 0;
var size = this.size();
var len = this._list.length;
if (i >= size || i < -size || count < 1) return void 0;
if (i < 0) i += size;
if (count === 1 || !count) {
removed = new Array(1);
removed[0] = this.removeOne(i);
return removed;
}
if (i === 0 && i + count >= size) {
removed = this.toArray();
this.clear();
return removed;
}
if (i + count > size) count = size - i;
var k;
removed = new Array(count);
for (k = 0; k < count; k++) {
removed[k] = this._list[(this._head + i + k) & this._capacityMask];
}
i = (this._head + i) & this._capacityMask;
if (index + count === size) {
this._tail = (this._tail - count + len) & this._capacityMask;
for (k = count; k > 0; k--) {
this._list[i = (i + 1 + len) & this._capacityMask] = void 0;
}
return removed;
}
if (index === 0) {
this._head = (this._head + count + len) & this._capacityMask;
for (k = count - 1; k > 0; k--) {
this._list[i = (i + 1 + len) & this._capacityMask] = void 0;
}
return removed;
}
if (i < size / 2) {
this._head = (this._head + index + count + len) & this._capacityMask;
for (k = index; k > 0; k--) {
this.unshift(this._list[i = (i - 1 + len) & this._capacityMask]);
}
i = (this._head - 1 + len) & this._capacityMask;
while (del_count > 0) {
this._list[i = (i - 1 + len) & this._capacityMask] = void 0;
del_count--;
}
if (index < 0) this._tail = i;
} else {
this._tail = i;
i = (i + count + len) & this._capacityMask;
for (k = size - (count + index); k > 0; k--) {
this.push(this._list[i++]);
}
i = this._tail;
while (del_count > 0) {
this._list[i = (i + 1 + len) & this._capacityMask] = void 0;
del_count--;
}
}
if (this._head < 2 && this._tail > 10000 && this._tail <= len >>> 2) this._shrinkArray();
return removed;
};
/**
* Native splice implementation.
* Remove number of items from the specified index from the list and/or add new elements.
* Returns array of removed items or empty array if count == 0.
* Returns undefined if the list is empty.
*
* @param index
* @param count
* @param {...*} [elements]
* @returns {array}
*/
Denque.prototype.splice = function splice(index, count) {
var i = index;
// expect a number or return undefined
if ((i !== (i | 0))) {
return void 0;
}
var size = this.size();
if (i < 0) i += size;
if (i > size) return void 0;
if (arguments.length > 2) {
var k;
var temp;
var removed;
var arg_len = arguments.length;
var len = this._list.length;
var arguments_index = 2;
if (!size || i < size / 2) {
temp = new Array(i);
for (k = 0; k < i; k++) {
temp[k] = this._list[(this._head + k) & this._capacityMask];
}
if (count === 0) {
removed = [];
if (i > 0) {
this._head = (this._head + i + len) & this._capacityMask;
}
} else {
removed = this.remove(i, count);
this._head = (this._head + i + len) & this._capacityMask;
}
while (arg_len > arguments_index) {
this.unshift(arguments[--arg_len]);
}
for (k = i; k > 0; k--) {
this.unshift(temp[k - 1]);
}
} else {
temp = new Array(size - (i + count));
var leng = temp.length;
for (k = 0; k < leng; k++) {
temp[k] = this._list[(this._head + i + count + k) & this._capacityMask];
}
if (count === 0) {
removed = [];
if (i != size) {
this._tail = (this._head + i + len) & this._capacityMask;
}
} else {
removed = this.remove(i, count);
this._tail = (this._tail - leng + len) & this._capacityMask;
}
while (arguments_index < arg_len) {
this.push(arguments[arguments_index++]);
}
for (k = 0; k < leng; k++) {
this.push(temp[k]);
}
}
return removed;
} else {
return this.remove(i, count);
}
};
/**
* Soft clear - does not reset capacity.
*/
Denque.prototype.clear = function clear() {
this._list = new Array(this._list.length);
this._head = 0;
this._tail = 0;
};
/**
* Returns true or false whether the list is empty.
* @returns {boolean}
*/
Denque.prototype.isEmpty = function isEmpty() {
return this._head === this._tail;
};
/**
* Returns an array of all queue items.
* @returns {Array}
*/
Denque.prototype.toArray = function toArray() {
return this._copyArray(false);
};
/**
* -------------
* INTERNALS
* -------------
*/
/**
* Fills the queue with items from an array
* For use in the constructor
* @param array
* @private
*/
Denque.prototype._fromArray = function _fromArray(array) {
var length = array.length;
var capacity = this._nextPowerOf2(length);
this._list = new Array(capacity);
this._capacityMask = capacity - 1;
this._tail = length;
for (var i = 0; i < length; i++) this._list[i] = array[i];
};
/**
*
* @param fullCopy
* @param size Initialize the array with a specific size. Will default to the current list size
* @returns {Array}
* @private
*/
Denque.prototype._copyArray = function _copyArray(fullCopy, size) {
var src = this._list;
var capacity = src.length;
var length = this.length;
size = size | length;
// No prealloc requested and the buffer is contiguous
if (size == length && this._head < this._tail) {
// Simply do a fast slice copy
return this._list.slice(this._head, this._tail);
}
var dest = new Array(size);
var k = 0;
var i;
if (fullCopy || this._head > this._tail) {
for (i = this._head; i < capacity; i++) dest[k++] = src[i];
for (i = 0; i < this._tail; i++) dest[k++] = src[i];
} else {
for (i = this._head; i < this._tail; i++) dest[k++] = src[i];
}
return dest;
}
/**
* Grows the internal list array.
* @private
*/
Denque.prototype._growArray = function _growArray() {
if (this._head != 0) {
// double array size and copy existing data, head to end, then beginning to tail.
var newList = this._copyArray(true, this._list.length << 1);
this._tail = this._list.length;
this._head = 0;
this._list = newList;
} else {
this._tail = this._list.length;
this._list.length <<= 1;
}
this._capacityMask = (this._capacityMask << 1) | 1;
};
/**
* Shrinks the internal list array.
* @private
*/
Denque.prototype._shrinkArray = function _shrinkArray() {
this._list.length >>>= 1;
this._capacityMask >>>= 1;
};
/**
* Find the next power of 2, at least 4
* @private
* @param {number} num
* @returns {number}
*/
Denque.prototype._nextPowerOf2 = function _nextPowerOf2(num) {
var log2 = Math.log(num) / Math.log(2);
var nextPow2 = 1 << (log2 + 1);
return Math.max(nextPow2, 4);
}
module.exports = Denque;

58
panel-mgmt_backend/node_modules/denque/package.json generated vendored Normal file
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@@ -0,0 +1,58 @@
{
"name": "denque",
"version": "2.1.0",
"description": "The fastest javascript implementation of a double-ended queue. Used by the official Redis, MongoDB, MariaDB & MySQL libraries for Node.js and many other libraries. Maintains compatability with deque.",
"main": "index.js",
"engines": {
"node": ">=0.10"
},
"keywords": [
"data-structure",
"data-structures",
"queue",
"double",
"end",
"ended",
"deque",
"denque",
"double-ended-queue"
],
"scripts": {
"test": "istanbul cover --report lcov _mocha && npm run typescript",
"coveralls": "cat ./coverage/lcov.info | coveralls",
"typescript": "tsc --project ./test/type/tsconfig.json",
"benchmark_thousand": "node benchmark/thousand",
"benchmark_2mil": "node benchmark/two_million",
"benchmark_splice": "node benchmark/splice",
"benchmark_remove": "node benchmark/remove",
"benchmark_removeOne": "node benchmark/removeOne",
"benchmark_growth": "node benchmark/growth",
"benchmark_toArray": "node benchmark/toArray",
"benchmark_fromArray": "node benchmark/fromArray"
},
"repository": {
"type": "git",
"url": "git+https://github.com/invertase/denque.git"
},
"license": "Apache-2.0",
"author": {
"name": "Invertase",
"email": "oss@invertase.io",
"url": "http://github.com/invertase/"
},
"contributors": [
"Mike Diarmid (Salakar) <mike@invertase.io>"
],
"bugs": {
"url": "https://github.com/invertase/denque/issues"
},
"homepage": "https://docs.page/invertase/denque",
"devDependencies": {
"benchmark": "^2.1.4",
"codecov": "^3.8.3",
"double-ended-queue": "^2.1.0-0",
"istanbul": "^0.4.5",
"mocha": "^3.5.3",
"typescript": "^3.4.1"
}
}