Persian Font Fix (Vazir)

Apply Vazir font to Persian/RTL content across selected websites
当前为 2025-06-18 提交的版本，查看最新版本。
换行
// ==UserScript==
// @name         Persian Font Fix (Vazir)
// @namespace    https://gf.qytechs.cn/en/scripts/538095-persian-font-fix-vazir
// @version      1.6
// @description  Apply Vazir font to Persian/RTL content across selected websites
// @author       TheSina
// @match       *://*.telegram.org/*
// @match       *://*.x.com/*
// @match       *://*.twitter.com/*
// @match       *://*.instagram.com/*
// @match       *://*.facebook.com/*
// @match       *://*.whatsapp.com/*
// @match       *://*.github.com/*
// @match       *://*.youtube.com/*
// @match       *://*.soundcloud.com/*
// @match       *://www.google.com/*
// @match       *://gemini.google.com/*
// @match       *://translate.google.com/*
// @match       *://*.chatgpt.com/*
// @match       *://*.openai.com/*
// @match       *://fa.wikipedia.org/*
// @match       *://app.slack.com/*
// @match       *://*.goodreads.com/*
// @grant        GM_addStyle
// @run-at       document-start
// @license      MIT
// ==/UserScript==


(function () {
    'use strict';

    // --- Style Injection ---
    GM_addStyle(`
        @font-face {
            font-family: 'VazirmatnCustom';
            src: local('Vazirmatn');
            unicode-range: U+0600-06FF, U+0750-077F, U+08A0-08FF, U+FB50-FDFF, U+FE70-FEFF;
        }

        html, body, p, span, div, h1, h2, h3, h4, h5, h6, a, li, ul, ol, td, th, input, textarea {
            font-family: 'VazirmatnCustom', 'Noto Sans', 'Noto Color Emoji', sans-serif !important;
        }
    `);

    // --- Efficient Character Replacement ---
    const characterReplacements = {
        '\u064A': '\u06CC', // Arabic Yeh -> Persian Yeh
        '\u0643': '\u06A9'  // Arabic Kaf -> Persian Kaf
    };

    const persianRegex = /[\u0600-\u06FF\u0750-\u077F\u08A0-\u08FF\uFB50-\uFDFF\uFE70-\uFEFF]/;

    const fixText = (text) => text.replace(/[\u064A\u0643]/g, char => characterReplacements[char]);

    // --- High-Performance DOM Traversal ---
    const fixPersianCharsInNode = (rootNode) => {
        const treeWalker = document.createTreeWalker(rootNode, NodeFilter.SHOW_TEXT);
        let currentNode;

        while ((currentNode = treeWalker.nextNode())) {
            const parentTag = currentNode.parentElement?.tagName;
            if (parentTag === 'SCRIPT' || parentTag === 'STYLE') continue;

            const originalValue = currentNode.nodeValue;
            if (!persianRegex.test(originalValue)) continue;  // Skip non-Persian text

            const fixedValue = fixText(originalValue);
            if (originalValue !== fixedValue) {
                currentNode.nodeValue = fixedValue;
            }
        }
    };

    // --- Input and Textarea Handling ---
    const processInputElement = (el) => {
        if (el.dataset.__persianFixAttached) return;
        el.dataset.__persianFixAttached = "true";

        if (el.value && persianRegex.test(el.value)) {
            el.value = fixText(el.value);
        }

        el.addEventListener('input', () => {
            const originalValue = el.value;
            if (!persianRegex.test(originalValue)) return;

            const fixedValue = fixText(originalValue);
            if (originalValue !== fixedValue) {
                const start = el.selectionStart;
                const end = el.selectionEnd;
                el.value = fixedValue;
                el.setSelectionRange(start, end);
            }
        });
    };

    const processAllInputs = (root = document) => {
        const elements = root.querySelectorAll('input[type="text"], textarea');
        for (const el of elements) {
            processInputElement(el);
        }
    };

    // --- Throttled Mutation Observer for Dynamic Content ---
    let observerScheduled = false;
    const pendingMutations = [];

    const observer = new MutationObserver((mutations) => {
        pendingMutations.push(...mutations);

        if (!observerScheduled) {
            observerScheduled = true;
            setTimeout(() => {
                for (const mutation of pendingMutations.splice(0)) {
                    for (const node of mutation.addedNodes) {
                        if (node.nodeType === Node.ELEMENT_NODE || node.nodeType === Node.DOCUMENT_FRAGMENT_NODE) {
                            fixPersianCharsInNode(node);
                            processAllInputs(node);
                        }
                    }
                }
                observerScheduled = false;
            }, 100); // Throttle to every 100 ms
        }
    });

    // --- Script Initialization ---
    const start = () => {
        fixPersianCharsInNode(document.body);
        processAllInputs(document);

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

    const waitForBody = () => {
        if (document.body) {
            start();
        } else {
            requestAnimationFrame(waitForBody);
        }
    };

    waitForBody();

})();
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