/**
 * Derived class that represents the quit statement in the SILLY language.
 *   @author Dave Reed
 *   @version 2/8/12
 */
public class Quit extends Statement {
    /**
     * Reads in a quit statement from the specified input stream
     *   @param input the stream to be read from
     */
	public Quit(TokenStream input) throws Exception {
	    Token keyword = input.next();
	    
	    if (!keyword.toString().equals("quit")) {
	        throw new Exception("SYNTAX ERROR: Malformed quit statement");
	    }
	}
	
    /**
	 * Executes the current quit statement.
	 *   @param bindings the current variable bindings
	 */
	public void execute(Bindings bindings) throws Exception {
	    System.out.println("BYE");   
	}
		
	/**
	 * Accesses the type of the current statement.
	 *   @return this statement's type, i.e., Statement.Type.QUIT
	 */
	public Statement.Type getType() {
	    return Statement.Type.QUIT;
	}
	
	/**
	 * Converts the current quit statement into a String.
	 *   @return the String representation of this statement
	 */
	public String toString() {
	    return "quit";    
	}
}