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RandInt-Getter

get a stochastic integer in range

此腳本不應該直接安裝，它是一個供其他腳本使用的函式庫。欲使用本函式庫，請在腳本 metadata 寫上： // @require https://update.cn-greasyfork.org/scripts/430439/1074311/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. // @grant        unsafeWindow
  8. // @license      GPLv3
  9. // ==/UserScript==
  10.  
  11. /**
  12.  * @description get a stochastic integer in range
  13.  * @param exp pattern: [|(  -*  \d+  ,  -*  \d+  )|]
  14.  * @returns a stochastic integer with type number in range
  15.  */
  16. unsafeWindow.getRandInt = (exp) => {
  17.     if ('string' != typeof exp) {
  18.         throw 'Expression param error: the param inputed must be a string';
  19.     }
  20.     if (!/[\[\(]\s*-{0,1}\s*\d+\s*,\s*-{0,1}\s*\d+\s*[\]\)]/.test(exp)) {
  21.         throw 'Expression syntax error';
  22.     }
  23.     let res;
  24.     exp.replace(/([\[\(])\s*(-{0,1}\s*\d+)\s*,\s*(-{0,1}\s*\d+)\s*([\]\)])/g, (rs, $1, $2, $3, $4) => {
  25.         let left = $1.charCodeAt(),
  26.             min = parseInt($2.replace(/\s+/, '')),
  27.             max = parseInt($3.replace(/\s+/, '')),
  28.             right = $4.charCodeAt();
  29.         if (min > max) {
  30.             throw `Expression param error: cause ${min} > ${max}`;
  31.         } else if (right - left == 1 && max <= min + 1) {
  32.             throw `Expression param error: cause range is '(' and ')' but can't found any integer between ${min} and ${max}`;
  33.         } else {
  34.             res = min + Math.floor(Math.random() * (max - min + (right == left + 2 ? 1 : right == left + 1 ? -1 : 0))) + (left == 40 ? 1 : 0);
  35.         }
  36.     })
  37.     return res;
  38. }