Мелкобукву нахуй

// ==UserScript==
// @name         Мелкобуква нахуй с двачей
// @namespace    2ch-lowercase-filter
// @match        *://2ch.su/*
// @grant        none
// ==/UserScript==

(function () {
    'use strict';

    const badPostIds = new Set();

    function getPostId(post) {
        return post.id ? post.id.replace(/\D/g, '') : null;
    }

    function getRealLines(node) {
        const walker = document.createTreeWalker(
            node,
            NodeFilter.SHOW_TEXT,
            null
        );

        const lines = [];
        let n;

        while ((n = walker.nextNode())) {
            const parts = n.nodeValue.split('\n');
            for (let p of parts) {
                const t = p.trim();
                if (t) lines.push(t);
            }
        }

        return lines;
    }

    function collapseHide(post) {
        post.style.height = "0px";
        post.style.overflow = "hidden";
        post.style.opacity = "0";
        post.style.margin = "0";
        post.style.padding = "0";
        post.style.border = "0";
    }

    function processPosts() {

        // ===== PASS 1 — классификация =====

        document.querySelectorAll('.post').forEach(post => {
            if (post.dataset.lowercaseChecked) return;

            const msg = post.querySelector('.post__message');
            if (!msg) return;

            const fullText = msg.textContent || '';

            // ---- OP override ----
            const opMatches = fullText.match(/>>\d+\s*\(OP\)/g);
            if (opMatches && opMatches.length >= 2) {
                post.style.outline = '3px solid #00cc66';
                post.style.background = 'rgba(0,255,120,0.10)';
                msg.style.color = '#33dd88';

                post.dataset.filterState = "good";
                post.dataset.lowercaseChecked = "1";
                return;
            }

            const lines = getRealLines(msg);
            const filtered = lines.filter(l =>
                !l.startsWith('>') && !l.startsWith('>>')
            );

            if (filtered.length) {
                const firstChar = filtered[0].charAt(0);

                if (/[а-яё]/.test(firstChar)) {
                    const id = getPostId(post);
                    if (id) badPostIds.add(id);

                    collapseHide(post);
                    post.dataset.filterState = "bad";
                }
            }

            post.dataset.lowercaseChecked = "1";
        });

        // ===== PASS 2 — красим ссылки =====

        document.querySelectorAll('a').forEach(a => {
            const m = a.textContent.match(/^>>(\d+)$/);
            if (!m) return;

            if (badPostIds.has(m[1])) {
                a.style.color = "#ff4444";
            }
        });

        // ===== PASS 3 — чистим reply =====

        document.querySelectorAll('.post').forEach(post => {
            const boxes = post.querySelectorAll(
                '.post__replies, .reflinks, .post__refmap, .post__replymap'
            );

            boxes.forEach(box => {
                box.querySelectorAll('a').forEach(a => {
                    const m = a.textContent.match(/>>(\d+)/);
                    if (m && badPostIds.has(m[1])) {
                        a.remove();
                    }
                });
            });
        });
    }

    processPosts();

    const observer = new MutationObserver(processPosts);
    observer.observe(document.body, { childList: true, subtree: true });

})();