/*
 * I provide a simple wrapper around a char reader, which
 * allow me to examine the current char without moving on
 * to the next.
 */
package dk.itu.kasper.Macros;

import java.io.Reader;
import java.io.IOException;

public class ReadIterator {
	private Reader in;
	private int current;
	/* current is -1 if the reader is empty.
	 * current is the next char to be returned by next;
	 */

	public ReadIterator(Reader r){
		in = r;
		try{
			current = in.read();
		}catch(IOException e){
			try{
				in.close();
			}catch(IOException ee){};
			current = -1;
		}
	}
	/* pre: none;
	 * post: true if there is a current char;
	 */
	public boolean hasMore(){
		return current != -1;
	}

	/* pre: hasMore()
	 * post: returns the current char
	 */
	public char current(){
		return (char)current;
	}
	/* pre: hasMore()
	 * post: returns current. then moves to next char if any
	 */
	public char next(){
		char ret = current();
		try{
			current = in.read();
		}catch(IOException e){
			try{
				in.close();
			}catch(IOException ee){};
			current = -1;
		}
		return ret;
	}
}