☰

RandInt-Getter

get a stochastic integer in range

Verzia zo dňa 07.08.2021. Pozri najnovšiu verziu.

Tento skript by nemal byť nainštalovaný priamo. Je to knižnica pre ďalšie skripty, ktorú by mali používať cez meta príkaz // @require https://update.greasyfork.org/scripts/430439/957975/RandInt-Getter.js 

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


document.defaultView.getRandInt = getRandInt;


/**
 * @description get a stochastic integer in range
 * @param exp pattern: [|(  -*  \d+  ,  -*  \d+  )|]
 * @returns a stochastic integer with type number in range
 */
function 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;
}