/**
 *"World of Zuul"
 *
 * @author (Nadia Tiara Febriana)
 * @version (16-11-20)
 */
import java.io.BufferedReader;
import java.io.InputStreamReader; 
import java.util.StringTokenizer;
import java.lang.String;
public class Parser
{
    private CommandWords commands;  // holds all valid command words
 
    public Parser()
    {
        commands = new CommandWords();
    }
 
    public Command getCommand()
    {
        String inputLine = "";   // will hold the full input line
        String word1;
        String word2;
           
        System.out.print("> ");     // print prompt
        
        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();      // get first word
        else
            word1=null;
        if(tokenizer.hasMoreTokens()) 
            word2 = tokenizer.nextToken();      // get second word
        else
            word2=null;
            // note: we just ignore the rest of the input line.
            
        // Now check whether this word is known. If so, create a command
        // with it. If not, create a "null" command (for unknown command).
        if(commands.isCommand(word1))
            return new Command(word1, word2);
        else
            return new Command(null, word2);
    }
}