| 1 | |
| 2 | export default class CircularArray<T> extends Array<T> { |
| 3 | public size: number; |
| 4 | private readonly defaultCircularArraySize = 2000; |
| 5 | |
| 6 | constructor(size?: number) { |
| 7 | super(); |
| 8 | this.size = size ?? this.defaultCircularArraySize; |
| 9 | } |
| 10 | |
| 11 | public push(...items: T[]): number { |
| 12 | if (this.length + items.length > this.size) { |
| 13 | super.splice(0, (this.length + items.length) - this.size); |
| 14 | } |
| 15 | return super.push(...items); |
| 16 | } |
| 17 | |
| 18 | public unshift(...items: T[]): number { |
| 19 | if (this.length + items.length > this.size) { |
| 20 | super.splice(this.size - items.length, (this.length + items.length) - this.size); |
| 21 | } |
| 22 | return super.unshift(...items); |
| 23 | } |
| 24 | |
| 25 | public concat(...items: (T | ConcatArray<T>)[]): T[] { |
| 26 | if (this.length + items.length > this.size) { |
| 27 | super.splice(0, (this.length + items.length) - this.size); |
| 28 | } |
| 29 | return super.concat(items as T[]); |
| 30 | } |
| 31 | |
| 32 | public splice(start: number, deleteCount?: number, ...items: T[]): T[] { |
| 33 | this.push(...items); |
| 34 | return super.splice(start, deleteCount); |
| 35 | } |
| 36 | |
| 37 | public resize(size: number): void { |
| 38 | if (size < 0) { |
| 39 | throw new RangeError( |
| 40 | 'circular array size does not allow negative values.' |
| 41 | ); |
| 42 | } |
| 43 | if (size === 0) { |
| 44 | this.length = 0; |
| 45 | } else if (size !== this.size) { |
| 46 | this.slice(-size); |
| 47 | } |
| 48 | this.size = size; |
| 49 | } |
| 50 | |
| 51 | public empty(): boolean { |
| 52 | return this.length === 0; |
| 53 | } |
| 54 | |
| 55 | public full(): boolean { |
| 56 | return this.length === this.size; |
| 57 | } |
| 58 | } |