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content.js
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content.js
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// Constant identifiers and URLs for microphone button states and images.
const MIC_BUTTON_ID = 'mic-button';
const MIC_ACTIVE_CLASS = 'active';
const MIC_IMG_URL = './assets/mic.png';
const MIC_ACTIVE_IMG_URL = '/assets/mic-active.png';
// Defines a manager class for handling speech-to-text functionality.
class SpeechToTextManager {
constructor() {
// Initialize properties to manage state and DOM elements.
this.previousSpeechResult = '';
this.lastMicStopTime = 0;
this.isMicRunning = false;
this.previousInputs = [];
this.inputIndex = -1;
this.micButton = null;
this.textArea = null;
this.speechToTextInput = null;
this.unsavedSpeech = '';
this.initMutationObserver = this.initMutationObserver.bind(this);
// Retrieve stored message history from local Chrome storage.
chrome.storage.local.get(["messageHistory"], (result) => {
if (result.messageHistory) {
this.previousInputs = result.messageHistory;
}
});
}
// Sets up a mutation observer to re-add mic button if UI changes.
initMutationObserver() {
const observer = new MutationObserver((mutations) => {
mutations.forEach((mutation) => {
if (mutation.type === 'childList' && mutation.addedNodes.length > 0 && !document.querySelector(`#${MIC_BUTTON_ID}`) && !this.isMicRunning) {
this.initializeMic();
}
});
});
observer.observe(document.body, { childList: true, subtree: true });
}
// Initializes the microphone button and sets up speech-to-text.
async initializeMic() {
this.isMicRunning = true;
this.textArea = document.getElementById('prompt-textarea');
if (!this.textArea) return;
this.micButton = this.createMicButton(this.textArea);
this.speechToTextInput = this.initializeSpeechToText(this.micButton, this.textArea);
await this.loadMicButtonStyles();
this.addMicButtonToTextArea();
this.attachKeyboardShortcuts();
// Bind form submission to handleFormSubmit for processing speech input.
let form = document.getElementsByTagName('form')[0];
if (form) {
form.addEventListener('submit', (e) => this.handleFormSubmit(e));
}
this.textArea.addEventListener('input', (event) => {
this.unsavedSpeech = this.textArea.value;
});
this.isMicRunning = false;
}
// Cycles through previously entered inputs using keyboard shortcuts.
cycleThroughPreviousInputs(event) {
const shortcutPressed = navigator.platform.startsWith('Mac') ? event.metaKey : event.ctrlKey;
if (shortcutPressed && event.key === "ArrowDown") {
if (this.inputIndex < this.previousInputs.length - 1) {
this.inputIndex++;
this.textArea.value = this.previousInputs[this.inputIndex];
}
} else if (shortcutPressed && event.key === "ArrowUp") {
if (this.inputIndex > 0) {
this.inputIndex--;
this.textArea.value = this.previousInputs[this.inputIndex];
}
}
}
// Creates a button element for activating the microphone.
createMicButton() {
const micButton = document.createElement('button');
micButton.id = MIC_BUTTON_ID;
const imageUrl = chrome.runtime.getURL(MIC_IMG_URL);
micButton.style.backgroundImage = `url('${imageUrl}')`;
micButton.onclick = (event) => this.handleMicButtonClick(event);
return micButton;
}
// Starts the speech recognition service.
startSpeechToText() {
this.speechToTextInput.start();
}
// Event handler for mic button click, toggling the speech-to-text functionality.
handleMicButtonClick(event) {
event.preventDefault();
if (this.micButton.classList.contains(MIC_ACTIVE_CLASS)) {
this.stopSpeechToText();
} else {
this.startSpeechToText();
}
}
// Initializes the speech recognition API.
initializeSpeechToText() {
const recognition = new webkitSpeechRecognition();
recognition.lang = 'en-US';
recognition.interimResults = true;
recognition.continuous = true;
recognition.onstart = () => this.handleSpeechStart();
recognition.onresult = (event) => this.handleSpeechResult(event);
recognition.onerror = (error) => console.error('Speech recognition error:', error);
return recognition;
}
// Updates UI and internal state on speech start.
handleSpeechStart() {
let newImageUrl = chrome.runtime.getURL(MIC_ACTIVE_IMG_URL);
this.micButton.style.backgroundImage = `url('${newImageUrl}')`;
this.micButton.classList.add(MIC_ACTIVE_CLASS);
this.previousSpeechResult = this.textArea.value + ' ';
}
// Processes and displays the speech-to-text results.
handleSpeechResult(event) {
if (Date.now() - this.lastMicStopTime < 300) return;
let currentSpeech = '';
for (let i = 0; i < event.results.length; i++) {
for (let j = 0; j < event.results[i].length; j++) {
currentSpeech += event.results[i][j].transcript;
}
}
this.textArea.value = this.previousSpeechResult + currentSpeech;
this.textArea.dispatchEvent(new Event('input', { bubbles: true }));
}
// Stops the speech recognition service.
stopSpeechToText() {
this.speechToTextInput.stop();
this.lastMicStopTime = Date.now();
this.micButton.classList.remove(MIC_ACTIVE_CLASS);
const newImageUrl = chrome.runtime.getURL(MIC_IMG_URL);
this.micButton.style.backgroundImage = `url('${newImageUrl}')`;
this.textArea.focus();
}
// Loads and applies CSS styles from a local file.
async loadMicButtonStyles() {
try {
const response = await fetch(chrome.runtime.getURL('./assets/styles.css'));
if (!response.ok) throw new Error(`HTTP error! status: ${response.status}`);
const data = await response.text();
let style = document.createElement('style');
style.innerHTML = data;
document.head.appendChild(style);
} catch (error) {
console.error('Error fetching CSS file:', error);
}
}
// Wraps the textarea and microphone button in a div, adjusting layout.
addMicButtonToTextArea() {
const parentElement = this.textArea.parentElement;
const wrapperDiv = document.createElement('div');
wrapperDiv.classList.add('wrapper-div');
parentElement.removeChild(this.textArea);
parentElement.appendChild(this.micButton);
wrapperDiv.appendChild(this.micButton);
wrapperDiv.appendChild(this.textArea);
parentElement.appendChild(wrapperDiv);
this.textArea.focus();
// Ensure textarea uses the full available width
this.textArea.style.width = '100%';
this.textArea.style.boxSizing = 'border-box';
}
// Attaches event listeners for keyboard shortcuts.
attachKeyboardShortcuts() {
document.addEventListener('keydown', (event) => this.handleKeyboardEvent(event));
}
// General handler for keyboard events throughout the application.
handleKeyboardEvent(event) {
if (event.key === 'Enter' && !event.shiftKey) {
event.preventDefault();
// add the unsaved speech to storage
if (this.unsavedSpeech) {
this.previousInputs.unshift(this.unsavedSpeech);
chrome.storage.local.set({ messageHistory: this.previousInputs }, function () {
});
this.inputIndex = -1;
this.unsavedSpeech = '';
}
this.handleFormSubmit(event);
if (this.isMicButtonActive()) {
this.micButton.click();
}
if (this.isMicButtonActive()) {
setTimeout(() => {
this.micButton.click();
}, 800)
}
}
if (!event.ctrlKey) return;
const key = event.key.toLowerCase();
this.handleKeyboardShortcut(key, event);
}
// Submits the form and optionally stops speech recognition.
handleFormSubmit(e) {
e.preventDefault();
if (this.isMicButtonActive()) {
this.stopSpeechToText();
}
if (this.textArea.value) {
this.previousInputs.unshift(this.textArea.value);
chrome.storage.local.set({ messageHistory: this.previousInputs }, function () {
});
this.inputIndex = -1;
}
// reset currentSpeech after textarea is cleared
}
// Handles specific keyboard shortcuts.
handleKeyboardShortcut(key, event) {
let micOn = this.isMicButtonActive();
switch (key) {
// Toggles the mic
case 's':
event.preventDefault();
this.micButton.click();
break;
// Clears the text
case 'u':
event.preventDefault();
if (micOn) this.micButton.click();
this.previousSpeechResult = '';
this.textArea.value = '';
if (micOn) {
setTimeout(() => {
this.micButton.click();
}, 300)
}
break;
// Deletes the word before the cursor
// Mic is paused while deleting & readded after
case 'w':
event.preventDefault();
if (micOn) this.micButton.click();
// Updated regex to match a word at the end or the only word in the textarea
let newText = this.textArea.value.replace(/(?:\s|^)(\S+)$/, '');
this.textArea.value = newText;
if (micOn) {
setTimeout(() => {
this.micButton.click();
}, 300);
}
break;
default:
break;
}
}
// Checks if the mic button is active.
isMicButtonActive() {
return this.micButton && this.micButton.classList.contains(MIC_ACTIVE_CLASS);
}
// Initialize the microphone if it isn't already active.
addMic() {
if (document.getElementById(MIC_BUTTON_ID)) {
return;
}
if (!this.isMicButtonActive()) {
this.initializeMic();
}
}
}
// Instantiate the manager and setup event listeners.
let manager = new SpeechToTextManager();
window.addEventListener('resize', () => manager.addMic());
manager.addMic();
manager.initMutationObserver();