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RandInt-Getter

get a stochastic integer in range

当前为 2021-08-07 提交的版本，查看 最新版本。

此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.cn-greasyfork.org/scripts/430439/957975/RandInt-Getter.js 

  1. // ==UserScript==
  2. // @name         RandInt-Getter
  3. // @namespace    http://greasyfork.org/
  4. // @version      0.1
  5. // @description  get a stochastic integer in range
  6. // @author       Cosil.C
  7. // @license      GPL
  8. // ==/UserScript==
  9.  
  10.  
  11. document.defaultView.getRandInt = getRandInt;
  12.  
  13.  
  14. /**
  15.  * @description get a stochastic integer in range
  16.  * @param exp pattern: [|(  -*  \d+  ,  -*  \d+  )|]
  17.  * @returns a stochastic integer with type number in range
  18.  */
  19. function getRandInt(exp) {
  20.     if ('string' != typeof exp) {
  21.         throw 'Expression param error: the param inputed must be a string';
  22.     }
  23.     if (!/[\[\(]\s*-{0,1}\s*\d+\s*,\s*-{0,1}\s*\d+\s*[\]\)]/.test(exp)) {
  24.         throw 'Expression syntax error';
  25.     }
  26.     let res;
  27.     exp.replace(/([\[\(])\s*(-{0,1}\s*\d+)\s*,\s*(-{0,1}\s*\d+)\s*([\]\)])/g, (rs, $1, $2, $3, $4) => {
  28.         let left = $1.charCodeAt(),
  29.             min = parseInt($2.replace(/\s+/, '')),
  30.             max = parseInt($3.replace(/\s+/, '')),
  31.             right = $4.charCodeAt();
  32.         if (min > max) {
  33.             throw `Expression param error: cause ${min} > ${max}`;
  34.         } else if (right - left == 1 && max <= min + 1) {
  35.             throw `Expression param error: cause range is '(' and ')' but can't found any integer between ${min} and ${max}`;
  36.         } else {
  37.             res = min + Math.floor(Math.random() * (max - min + (right == left + 2 ? 1 : right == left + 1 ? -1 : 0))) + (left == 40 ? 1 : 0);
  38.         }
  39.     })
  40.     return res;
  41. }