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content_scripts/replacer.js

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+// Default dictionary as fallback
+const defaultWordsToReplace = {
+    "oldWord1": "newWord1",
+    "oldWord2": "newWord2",
+    "oldWord3": "newWord3"
+};
+
+// Variable to store words to replace
+let wordsToReplace = {};
+
+// Function to traverse text nodes and replace words
+function processNode(node) {
+    // Check if it's a text node
+    if (node.nodeType === Node.TEXT_NODE) {
+        let content = node.textContent;
+        let modified = false;
+        
+        // Perform replacements
+        for (const [oldWord, newWord] of Object.entries(wordsToReplace)) {
+            const regex = new RegExp(`\\b${oldWord}\\b`, 'gi'); // 'gi' for case insensitive
+            if (regex.test(content)) {
+                content = content.replace(regex, newWord);
+                modified = true;
+            }
+        }
+        
+        // Update text node only if necessary
+        if (modified) {
+            node.textContent = content;
+        }
+    } 
+    // Recursively process child nodes (if they are not script or style tags)
+    else if (node.nodeType === Node.ELEMENT_NODE && 
+             node.nodeName !== 'SCRIPT' && 
+             node.nodeName !== 'STYLE' && 
+             node.nodeName !== 'TEXTAREA') {
+        Array.from(node.childNodes).forEach(child => processNode(child));
+    }
+}
+
+// Main function to replace words
+function replaceWords() {
+    processNode(document.body);
+    
+    // Observe DOM changes to handle dynamically loaded content
+    const observer = new MutationObserver(mutations => {
+        mutations.forEach(mutation => {
+            mutation.addedNodes.forEach(node => {
+                processNode(node);
+            });
+        });
+    });
+    
+    observer.observe(document.body, {
+        childList: true,
+        subtree: true
+    });
+}
+
+// Function to load words from storage and start the process
+function loadReplacementsAndStart() {
+    // Request replacements from background script
+    chrome.runtime.sendMessage({action: 'getReplacements'}, function(response) {
+        // If we have a response, use it, otherwise use the default dictionary
+        wordsToReplace = response || defaultWordsToReplace;
+        console.log("Word replacements loaded:", wordsToReplace);
+        
+        // Start the replacement process
+        replaceWords();
+    });
+}
+
+// Listen for replacement updates while the page is open
+chrome.storage.onChanged.addListener(function(changes, namespace) {
+    if (namespace === 'local' && changes.wordReplacements) {
+        wordsToReplace = changes.wordReplacements.newValue;
+        console.log("Word replacements updated:", wordsToReplace);
+        // Restart the replacement process with new words
+        replaceWords();
+    }
+});
+
+// Listen for messages from popup/options.js
+chrome.runtime.onMessage.addListener(function(message, sender, sendResponse) {
+    if (message.action === 'replacementsUpdated') {
+        // Reload replacements and reapply
+        loadReplacementsAndStart();
+    }
+});
+
+// Start loading and replacement when DOM is ready
+if (document.readyState === 'loading') {
+    document.addEventListener('DOMContentLoaded', loadReplacementsAndStart);
+} else {
+    loadReplacementsAndStart();
+}