FastReader for Hindi and English

Enhance fast reading by highlighting specific syllables in Hindi script and letters in English script for Hindi and English web pages respectively. Works on all websites. Press Alt + R to toggle FastReader.
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// ==UserScript==
// @name         FastReader for Hindi and English
// @version      1.8
// @description  Enhance fast reading by highlighting specific syllables in Hindi script and letters in English script for Hindi and English web pages respectively. Works on all websites. Press Alt + R to toggle FastReader.
// @license      MIT
// @match        *://*/*
// @grant        none
// @author       iamnobody
// @namespace http://tampermonkey.net/
// ==/UserScript==

(function() {
    'use strict';

    // Create and style the toggle button
    var toggleButton = document.createElement('button');
    toggleButton.id = 'fast-reader-toggle-button';
    toggleButton.style.position = 'fixed';
    toggleButton.style.bottom = '10px'; // Reduced from 20px
    toggleButton.style.left = '10px'; // Reduced from 20px
    toggleButton.style.width = '30px'; // Reduced from 50px
    toggleButton.style.height = '30px'; // Reduced from 50px
    toggleButton.style.borderRadius = '50%';
    toggleButton.style.backgroundColor = 'red';
    toggleButton.style.color = 'white';
    toggleButton.style.fontSize = '16px'; // Reduced from 24px
    toggleButton.style.border = 'none';
    toggleButton.innerText = 'R';
    toggleButton.setAttribute('aria-label', 'Toggle Fast Reading (Alt + R)');
    document.body.appendChild(toggleButton);

    // Set default state of fast reading feature
    var isFastReadingOn = false;

    // Add event listener to toggle button
    toggleButton.addEventListener('click', toggleFastReading);

    // Add event listener for Alt + R keyboard shortcut
    document.addEventListener('keydown', function(event) {
        if (event.altKey && event.key === 'r') {
            toggleFastReading();
        }
    });

    // Function to toggle fast reading feature
    function toggleFastReading() {
        // Toggle fast reading feature and button color
        isFastReadingOn = !isFastReadingOn;
        toggleButton.style.backgroundColor = isFastReadingOn ? 'green' : 'red';

        // Activate/deactivate fast reading feature based on button state
        if (isFastReadingOn) {
            activateFastReading();
        } else {
            deactivateFastReading();
        }
    }

    // Function to activate fast reading feature
    function activateFastReading() {
        // Apply bold styling to text content in the document
        applyBoldStyling(document.body);
    }

    // Function to deactivate fast reading feature
    function deactivateFastReading() {
        // Remove bold styling from all elements
        var boldElements = document.querySelectorAll('b.fast-reader-bold');
        boldElements.forEach(function(element) {
            element.classList.remove('fast-reader-bold');
        });
    }

    // Function to apply bold styling to specified number of syllables in each word in the text content
    function applyBoldStyling(element) {
        // Check if the element is a text node
        if (element.nodeType === Node.TEXT_NODE) {
            var text = element.textContent.trim();
            var words = text.split(/\s+/); // Split text into words

            var newNode = document.createElement('span');
            words.forEach(function(word) {
                var highlightedWord = highlightWord(word);
                newNode.innerHTML += highlightedWord + ' ';
            });

            // Replace text content with styled HTML
            element.parentNode.replaceChild(newNode, element);
        } else {
            // Traverse child nodes recursively
            var children = element.childNodes;
            children.forEach(function(child) {
                applyBoldStyling(child);
            });
        }
    }

    // Function to highlight the specific syllables in Hindi script and letters in English script
    function highlightWord(word) {
        if (isHindiWord(word)) {
            // Highlight the specific syllables in Hindi words
            var highlightedWord = '';
            var i = 0;
            while (i < word.length) {
                var currentChar = word.charAt(i);
                var nextChar = word.charAt(i + 1);
                var combinedChar = currentChar + nextChar;
                if (isSpecialHindiCharacter(combinedChar)) {
                    highlightedWord += '<b class="fast-reader-bold">' + combinedChar + '</b>';
                    i += 2; // Skip the combined character
                } else {
                    highlightedWord += '<b class="fast-reader-bold">' + currentChar + '</b>';
                    i++;
                }
            }
            return highlightedWord;
        } else {
            // Highlight the first 4-5 letters in English words
            return '<b class="fast-reader-bold">' + word.substring(0, 5) + '</b>' + word.substring(5);
        }
    }

    // Function to detect if a word is in Hindi script
    function isHindiWord(word) {
        // Check if any character in the word falls within the Hindi Unicode range
        for (var i = 0; i < word.length; i++) {
            var charCode = word.charCodeAt(i);
            if (charCode >= 0x0900 && charCode <= 0x097F) {
                return true;
            }
        }
        return false;
    }

    // Function to check if a character is a special Hindi character
    function isSpecialHindiCharacter(character) {
        var charCode = character.charCodeAt(0);
        // Check if the character falls within the specified Unicode range
        if ((charCode >= 0x0901 && charCode <= 0x0903) || (charCode >= 0x093A && charCode <= 0x0957)) {
            return true;
        }
        return false;
    }
})();