Lightnovel Syntax Highlighting

Enhancing reading experience by highlighing 「dialogues」, 〈keywords〉, etc
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// ==UserScript==
// @name         Lightnovel Syntax Highlighting
// @name:en      Lightnovel Syntax Highlighting
// @name:zh      轻小说语法高亮
// @namespace    http://tampermonkey.net/
// @version      1.2.0
// @description  Enhancing reading experience by highlighing 「dialogues」, 〈keywords〉, etc
// @description:en  Enhancing reading experience by highlighing 「dialogues」, 〈keywords〉, etc
// @description:zh  通过语法高亮「对白」、〈关键词〉等内容增强阅读体验
// @author       Boring3
// @match        *://*.lightnovel.app/read/*
// @match        *://*.masiro.me/admin/novelReading*
// @match        *://*.wenku8.net/modules/article/reader.php*
// @match        *://*.esjzone.cc/forum/*/*.html
// @match        *://*.lightnovel.fun/detail/*
// @match        *://*.syosetu.com/*/*
// @match        *://*.linovelib.com/novel/*/*.html*
// @icon         https://www.google.com/s2/favicons?domain=masiro.me
// @license      GPLv3
// @run-at       document-end
// @grant        none
// ==/UserScript==

(function () {
    'use strict';

    const SELECTOR = [
        ".read", // 轻书架
        ".nvl-content", // 真白萌
        "#contentmain>#content", // Wenku8
        ".forum-content", // ESJ
        "#article-main-contents", // 轻国
        ".p-novel__body", // syosetu
        "#TextContent", // 哔哩
    ].join(',');

    const RULES = [
        {
            name: 'hlTalk',
            color: '#ff4482',
            pairs: [['「', '」'], ['“', '”']]
        },
        {
            name: 'hlTalk2',
            color: '#d36d33',
            pairs: [['『', '』'], ['‘', '’']]
        },
        {
            name: 'hlEnclosed',
            color: '#33aa04',
            pairs: [['(', ')'], ['（', '）'], ['[', ']'], ['［', '］']]
        },
        {
            name: 'hlTitle',
            color: '#dddd82',
            pairs: [['《', '》'], ['〈', '〉']]
        },
        {
            name: 'hlBrace',
            color: '#cccc00',
            pairs: [['【', '】'], ['〖', '〗'], ['〔', '〕']]
        }
    ];

    const styleContent = [
        ...RULES.map(r => `.${r.name} { color: ${r.color}; }`),
        `hl-processed { display: none; }`,
    ].join('\n');

    const styleEl = document.createElement('style');
    styleEl.textContent = styleContent;
    document.head.appendChild(styleEl);

    function escapeRegExp(str) {
        return str.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
    }

    function hasProcessedMarker(el) {
        if (!el) return false;
        for (const child of el.children) {
            if ((child.tagName || '').toLowerCase() === 'hl-processed') return true;
        }
        return false;
    }

    function addProcessedMarker(el) {
        if (!el || hasProcessedMarker(el)) return;
        const marker = document.createElement('hl-processed');
        marker.setAttribute('aria-hidden', 'true');
        el.appendChild(marker);
    }

    function highlightContent(contentEl) {
        if (!contentEl || hasProcessedMarker(contentEl)) return;

        let html = contentEl.innerHTML;
        let hasReplacement = false;

        RULES.forEach(rule => {
            if (!rule.pairs || rule.pairs.length === 0) return;

            const patterns = rule.pairs.map(([s, e]) => {
                const start = escapeRegExp(s);
                const end = escapeRegExp(e);
                return `${start}(.*?)${end}`;
            }).join('|');

            const regex = new RegExp(patterns, "gi");

            html = html.replace(regex, (match) => {
                hasReplacement = true;
                return `<span class="${rule.name}">${match}</span>`;
            });
        });
        if (hasReplacement) {
            contentEl.innerHTML = html;
            addProcessedMarker(contentEl); // 通过子元素避免SPA局部更新问题
        }
        console.log("Lightnovel Highlighting: processed")
    }

    const observer = new MutationObserver(() => {
        const contentEl = document.querySelector(SELECTOR);
        if (contentEl && !hasProcessedMarker(contentEl)) {
            highlightContent(contentEl);
        }
    });

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

    highlightContent(document.querySelector(SELECTOR));
})();