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RandInt-Getter

get a stochastic integer in range

Version vom 26.07.2022. Aktuellste Version

Dieses Skript sollte nicht direkt installiert werden. Es handelt sich hier um eine Bibliothek für andere Skripte, welche über folgenden Befehl in den Metadaten eines Skriptes eingebunden wird // @require https://update.greasyfork.org/scripts/430439/1074311/RandInt-Getter.js 

// ==UserScript==
// @name         RandInt-Getter
// @namespace    http://greasyfork.org/
// @version      0.1
// @description  get a stochastic integer in range
// @author       Cosil.C
// @grant        unsafeWindow
// @license      GPLv3
// ==/UserScript==

/**
 * @description get a stochastic integer in range
 * @param exp pattern: [|(  -*  \d+  ,  -*  \d+  )|]
 * @returns a stochastic integer with type number in range
 */
unsafeWindow.getRandInt = (exp) => {
    if ('string' != typeof exp) {
        throw 'Expression param error: the param inputed must be a string';
    }
    if (!/[\[\(]\s*-{0,1}\s*\d+\s*,\s*-{0,1}\s*\d+\s*[\]\)]/.test(exp)) {
        throw 'Expression syntax error';
    }
    let res;
    exp.replace(/([\[\(])\s*(-{0,1}\s*\d+)\s*,\s*(-{0,1}\s*\d+)\s*([\]\)])/g, (rs, $1, $2, $3, $4) => {
        let left = $1.charCodeAt(),
            min = parseInt($2.replace(/\s+/, '')),
            max = parseInt($3.replace(/\s+/, '')),
            right = $4.charCodeAt();
        if (min > max) {
            throw `Expression param error: cause ${min} > ${max}`;
        } else if (right - left == 1 && max <= min + 1) {
            throw `Expression param error: cause range is '(' and ')' but can't found any integer between ${min} and ${max}`;
        } else {
            res = min + Math.floor(Math.random() * (max - min + (right == left + 2 ? 1 : right == left + 1 ? -1 : 0))) + (left == 40 ? 1 : 0);
        }
    })
    return res;
}