import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.StringTokenizer;
/**
 * Write a description of class Parser here.
 *
 * @author Fiodhy Ardito Narawangsa
 * @version November 2020
 */
public class Parser
{
    private CommandWords commands;
    
    public Parser()
    {
        commands = new CommandWords();
    }
    
    public Command getCommand()
    {
        String inputLine = "";
        String word1;
        String word2;
        
        System.out.print("> ");
        
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        try
        {
            inputLine = reader.readLine();
        }
        catch(java.io.IOException exc)
        {
            System.out.println("There was an error during reading: " + exc.getMessage());
        }
        
        StringTokenizer tokenizer = new StringTokenizer(inputLine);
        
        if(tokenizer.hasMoreTokens())
            word1 = tokenizer.nextToken();
        else
            word1 = null;
            
        if(tokenizer.hasMoreTokens())
            word2 = tokenizer.nextToken();
        else
            word2 = null;
            
        if(commands.isCommand(word1))
            return new Command(word1,word2);
        else
            return new Command(null,word2);
    }
}