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* feat!: replace `rand-seed` with a built-in PRNG * docs: remove mention of Prando in `PRNG` TSDocs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,88 @@ | ||
| /** | ||
| * The following code is a modified version of Prando from `zeh/prando` on | ||
| * GitHub. | ||
| * | ||
| * Source: | ||
| * https://github.com/zeh/prando/blob/acc2a3c09df12a41b5c82fbf44e49e070e6f60ac/src/Prando.ts | ||
| * | ||
| * The MIT License (MIT) | ||
| * | ||
| * Copyright (c) 2016 Zeh Fernando | ||
| * | ||
| * 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. | ||
| */ | ||
|
|
||
| const MIN = -2147483648; // Int32 min | ||
| const MAX = 2147483647; // Int32 max | ||
|
|
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| const xorshift = (value: number): number => { | ||
| // Xorshift*32 | ||
| // Based on George Marsaglia's work: http://www.jstatsoft.org/v08/i14/paper | ||
| value ^= value << 13; | ||
| value ^= value >> 17; | ||
| value ^= value << 5; | ||
|
|
||
| return value; | ||
| }; | ||
|
|
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| /** | ||
| * Pseudorandom number generator. | ||
| */ | ||
| export class PRNG { | ||
| private _value: number; | ||
|
|
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| /** | ||
| * Generate a new pseudo-random number generator. | ||
| * | ||
| * @param seed - A number or string seed that determines which pseudo-random | ||
| * number sequence will be created. | ||
| */ | ||
| constructor(seed: number | string) { | ||
| if (typeof seed === "string") { | ||
| let hash = 0; | ||
| if (seed) { | ||
| const l = seed.length; | ||
| for (let i = 0; i < l; i++) { | ||
| hash = (hash << 5) - hash + seed.charCodeAt(i); | ||
| hash |= 0; | ||
| hash = xorshift(hash); | ||
| } | ||
| } | ||
|
|
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| this._value = hash; | ||
| } else { | ||
| this._value = seed; | ||
| } | ||
|
|
||
| if (this._value === 0) { | ||
| this._value = 1; | ||
| } | ||
| } | ||
|
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| /** | ||
| * Generates a pseudo-random number. | ||
| * | ||
| * @returns The generated pseudo-random number. | ||
| */ | ||
| public next(): number { | ||
| this._value = xorshift(this._value); | ||
|
|
||
| return (this._value - MIN) / (MAX - MIN); | ||
| } | ||
| } |
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