Minecraft-protocol-1.20.4-chat-parser/main/emit.js

const lang = require("./en_us.json"); // translate message

function inject(bot) {
bot.on('systemChat', (packet) => {
  //console.log(packet);
  msg = parseMinecraftMessage(packet.formattedMessage)
  if (msg !== undefined) bot.emit('custom_systemChat', msg);
});

bot.on('playerChat', (packet) => {
  //console.log(packet)
  const SenderName = packet.senderName ? parseMinecraftMessage(packet.senderName) : undefined;
  const TargetName = packet.targetName ? parseMinecraftMessage(packet.targetName) : undefined;
  const plainMessage = packet.plainMessage ? packet.plainMessage : undefined;
  const formattedMessage = packet.formattedMessage ? parseMinecraftMessage(packet.formattedMessage) : undefined;
  const unsignedContent = packet.unsignedContent ? parseMinecraftMessage(packet.unsignedContent) : undefined;
  switch (packet.type) {
	case 1: // /me text
	  msg = `* ${SenderName} ${formattedMessage}`;
	  break;
    case 2: // someone tell you text
      msg = `${SenderName} whispers to you: ${formattedMessage}`;
      break;
	case 3: // you tell someone text
	  msg = `You whisper to ${TargetName}: ${formattedMessage}`;
	  break;
    case 4: // player chat
	  // /sudo and vanish send formattedMessage message
	  // normal unsignedContent
	  vmsg = formattedMessage;
	  msg = unsignedContent;
      break;
    case 5: // /say text
      msg = `[${SenderName}] ${plainMessage ? plainMessage : formattedMessage}`;
      break;
    case 6: // /minecraft:teammsg text
      msg = `${TargetName} <${SenderName}> ${plainMessage}`;
      break;
    default:
      console.log(`Unknown player_chat packet. Type: ${packet.type}`);
	  console.log(packet)
      break;
  }
  if (msg !== undefined) bot.emit('custom_playerChat', msg);
  if (vmsg !== undefined) bot.emit('custom_systemChat', vmsg);
});

const ansiCodes = { // color code
  '§0': '\x1B[30m', '§1': '\x1B[34m', '§2': '\x1B[32m', '§3': '\x1B[36m', 
  '§4': '\x1B[31m', '§5': '\x1B[35m', '§6': '\x1B[33m', '§7': '\x1B[37m', 
  '§8': '\x1B[90m', '§9': '\x1B[94m', '§a': '\x1B[92m', '§b': '\x1B[96m', 
  '§c': '\x1B[91m', '§d': '\x1B[95m', '§e': '\x1B[93m', '§f': '\x1B[97m', 
  '§l': '\x1B[1m',  '§o': '\x1B[3m',  '§n': '\x1B[4m',  '§m': '\x1B[9m',  
  '§k': '\x1B[5m',  '§r': '\x1B[0m',
  'black': '\x1B[30m', 'dark_blue': '\x1B[34m', 'dark_green': '\x1B[32m', 
  'dark_aqua': '\x1B[36m', 'dark_red': '\x1B[31m', 'dark_purple': '\x1B[35m', 
  'gold': '\x1B[33m', 'gray': '\x1B[37m', 'dark_gray': '\x1B[90m', 'blue': '\x1B[94m', 
  'green': '\x1B[92m', 'aqua': '\x1B[96m', 'red': '\x1B[91m', 'light_purple': '\x1B[95m', 
  'yellow': '\x1B[93m', 'white': '\x1B[97m', 'bold': '\x1B[1m', 'italic': '\x1B[3m', 
  'underlined': '\x1B[4m', 'strikethrough': '\x1B[9m', 'obfuscated': '\x1B[5m', 'reset': '\x1B[0m',  // Color
  'undefined': '\x1B[0m'
};

function parseMinecraftMessage(component) {
  let jsonComponent;
  try {
	jsonComponent = JSON.parse(component);
  } catch (e) {
	console.error("Invalid JSON format:", component);
  }

  function extractText(comp) {
    let text = '';
	
	if (comp.text) {
      text += comp.text;
    }  
    if (comp[""]) {
      text += extractText(comp[""]);
    }
	if (typeof comp === 'string' || typeof comp === 'number') {
      text += comp;
    }
    if (comp.extra) {
      comp.extra.forEach(subComp => {
        text += extractText(subComp);
      });
    }
	if (comp.translate) {
	  let translateString = lang[comp.translate] || comp.translate;
	  if (comp.with) {
		const withArgs = comp.with.map(arg => extractText(arg));
		withArgs.forEach((arg, index) => {
		  if (arg.length > 10000) return translateString = ''; // anti tellraw translate crash
		  translateString = translateString.replace('%s', arg);
		  const placeholder = new RegExp(`%${index + 1}\\$s`, 'g');
		  translateString = translateString.replace(placeholder, arg);

		});
	  }
	  text += translateString;
	}

	if (comp.color && ansiCodes[comp.color] && !comp.color.startsWith('#')) {
		text = ansiCodes[comp.color] + text + ansiCodes['reset'];
	} else if (comp.color && comp.color.startsWith('#')) {
		const hexRegex = /#?([a-fA-F\d]{2})([a-fA-F\d]{2})([a-fA-F\d]{2})/;
		const hexCodes = hexRegex.exec(comp.color);
		if (hexCodes) {
			const red = parseInt(hexCodes[1], 16);
			const green = parseInt(hexCodes[2], 16);
			const blue = parseInt(hexCodes[3], 16);
			const ansiColor = `\u001b[38;2;${red};${green};${blue}m`;
			text = ansiColor + text + ansiCodes['reset'];
		}
	}

    if (comp.bold) {
      text = ansiCodes['§l'] + text;
    }
    if (comp.italic) {
      text = ansiCodes['§o'] + text;
    }
    if (comp.underlined) {
      text = ansiCodes['§n'] + text;
    }
    if (comp.strikethrough) {
      text = ansiCodes['§m'] + text;
    }
    if (comp.obfuscated) {
      text = ansiCodes['§k'] + text;
    }

    return text;
  }

  return extractText(jsonComponent) + ansiCodes['reset'];
}

}

module.exports = inject;