Unf**k Torn

Replace censored profanity in Torn forums with original words (case-preserving)
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// ==UserScript==
// @name         Unf**k Torn
// @namespace    https://torn.com/
// @version      1.1.1
// @description  Replace censored profanity in Torn forums with original words (case-preserving)
// @match        https://www.torn.com/forums.php*
// @grant        none
// @license      none
// ==/UserScript==

(function () {
    'use strict';

    function matchCase(original, replacement) {
        if (original === original.toUpperCase()) {
            return replacement.toUpperCase();
        }
        if (original === original.toLowerCase()) {
            return replacement.toLowerCase();
        }
        if (
            original[0] === original[0].toUpperCase() &&
            original.slice(1) === original.slice(1).toLowerCase()
        ) {
            return replacement.charAt(0).toUpperCase() + replacement.slice(1).toLowerCase();
        }
        return replacement;
    }

    // "Not part of a larger word" boundaries
    const replacements = [
        // ---- FUCK variants: longest first ----
        {
            regex: /(?<![A-Za-z0-9_])f\*+king(?![A-Za-z0-9_])/gi,
            replace: (m) => matchCase(m, 'fucking')
        },
        {
            regex: /(?<![A-Za-z0-9_])f\*+ing(?![A-Za-z0-9_])/gi,
            replace: (m) => matchCase(m, 'fucking')
        },
        {
            regex: /(?<![A-Za-z0-9_])f\*cking(?![A-Za-z0-9_])/gi,
            replace: (m) => matchCase(m, 'fucking')
        },
        {
            regex: /(?<![A-Za-z0-9_])f\*ck(?![A-Za-z0-9_])/gi,
            replace: (m) => matchCase(m, 'fuck')
        },
        {
            regex: /(?<![A-Za-z0-9_])f\*{2,}k(?![A-Za-z0-9_])/gi,
            replace: (m) => matchCase(m, 'fuck')
        },
        {
            regex: /(?<![A-Za-z0-9_])f\*{3,}(?![A-Za-z0-9_])/gi,
            replace: (m) => matchCase(m, 'fuck')
        },
        {
            regex: /(?<![A-Za-z0-9_])unf\*+k(?![A-Za-z0-9_])/gi,
            replace: (m) => matchCase(m, 'unfuck')
        },

        // ---- CUNT variants ----
        {
            regex: /(?<![A-Za-z0-9_])c\*nt(?![A-Za-z0-9_])/gi,
            replace: (m) => matchCase(m, 'cunt')
        },
        {
            regex: /(?<![A-Za-z0-9_])c\*{2,}t(?![A-Za-z0-9_])/gi,
            replace: (m) => matchCase(m, 'cunt')
        },
        {
            regex: /(?<![A-Za-z0-9_])c\*{3,}(?![A-Za-z0-9_])/gi,
            replace: (m) => matchCase(m, 'cunt')
        }
    ];

    function processTextNode(node) {
        const text = node.nodeValue;
        let updated = text;

        for (const rule of replacements) {
            updated = updated.replace(rule.regex, rule.replace);
        }

        if (updated !== text) {
            node.nodeValue = updated;
        }
    }

    function walk(node) {
        if (node.nodeType === Node.TEXT_NODE) {
            processTextNode(node);
        } else if (node.nodeType === Node.ELEMENT_NODE) {
            if (['SCRIPT', 'STYLE', 'TEXTAREA'].includes(node.tagName)) return;
            for (const child of node.childNodes) {
                walk(child);
            }
        }
    }

    function run() {
        if (document.body) walk(document.body);
    }

    run();

    const observer = new MutationObserver((mutations) => {
        for (const m of mutations) {
            for (const node of m.addedNodes) {
                walk(node);
            }
        }
    });

    if (document.body) {
        observer.observe(document.body, {
            childList: true,
            subtree: true
        });
    }
})();