Parser

/**
 * Write a description of class Parser here.
 *
 * @author Daffa Tristan Firdaus
 * @version 18 November 2020
 */

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 the first word
        else
            word1=null;
        if(tokenizer.hasMoreTokens())
            word2 = tokenizer.nextToken();      // get the second word
        else
            word2=null;

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