import java.util.Scanner;
/**
 * Class Parser here.
 *
 */
public class Parser
{
    private CommandWords commands;
    private Scanner reader;

    /**
     * Membuat sebuah parser untuk membaca dari terminal window.
     */
    public Parser()
    {
        commands = new CommandWords();
        reader = new Scanner(System.in);
    }

    /**
     * @return Perintah selanjutnya dari user.
     */
    public Command getCommand()
    {
        String inputLine;
        String word1 = null;
        String word2 = null;

        System.out.print("-> ");

        inputLine = reader.nextLine();

        Scanner tokenizer = new Scanner(inputLine);
        if(tokenizer.hasNext())
        {
           word1 = tokenizer.next();
           if(tokenizer.hasNext())
           {
               word2 = tokenizer.next();
           }
        }

        if(commands.isCommand(word1))
        {
            return new Command(word1, word2);
        }
        else
        {
            return new Command(null, word2);
        }
    }
}