import java.util.Scanner;



/**
 * Class Parser ini akan membaca inputan dari user dan menerjemahkannya sebagai
 * "Adventure" command.
 *

 * @author  M. Rayhan Raffi P.

 * @version 16-11-2020

 */

public class Parser

{

    private CommandWords commands;  // holds all valid command words

    private Scanner reader;         // source of command input



    /**

     * Create a parser to read from the terminal window.

     */

    public Parser()

    {

        commands = new CommandWords();

        reader = new Scanner(System.in);

    }



    /**

     * @return The next command from the user.

     */

    public Command getCommand()

    {

        String inputLine;   // will hold the full input line

        String word1 = null;

        String word2 = null;



        System.out.print("> ");     // print prompt



        inputLine = reader.nextLine();



        // Find up to two words on the line.

        Scanner tokenizer = new Scanner(inputLine);

        if(tokenizer.hasNext()) {

            word1 = tokenizer.next();      // get first word

            if(tokenizer.hasNext()) {

                word2 = tokenizer.next();      // get second word

                // 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);

        }

    }

}