/***** BEGIN LICENSE BLOCK *****
 * Version: CPL 1.0/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Common Public
 * License Version 1.0 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.eclipse.org/legal/cpl-v10.html
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * Copyright (C) 2002 Jan Arne Petersen <jpetersen@uni-bonn.de>
 * Copyright (C) 2002-2004 Anders Bengtsson <ndrsbngtssn@yahoo.se>
 * Copyright (C) 2004 Stefan Matthias Aust <sma@3plus4.de>
 * 
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the CPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the CPL, the GPL or the LGPL.
 ***** END LICENSE BLOCK *****/
package org.jruby.util;

import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PushbackInputStream;


/**
 * 
 * @author jpetersen
 */
public class RubyInputStream extends PushbackInputStream {
    public RubyInputStream(InputStream in) {
        super(new BufferedInputStream(in));
    }

    public String gets(String separatorString) throws IOException {
        if (separatorString == null) {
            return getsEntireStream();
        }
        final char[] separator = separatorString.toCharArray();

        int c = read();
        if (c == -1) {
            return null;
        }

        StringBuffer buffer = new StringBuffer();

        LineLoop : while (true) {
            while (c != separator[0] && c != -1) {
                buffer.append((char) c);
                c = read();
            }
            for (int i = 0; i < separator.length; i++) {
                if (c == -1) {
                    break LineLoop;
                } else if (c != separator[i]) {
                    continue LineLoop;
                }
                buffer.append((char) c);
                if (i < separator.length - 1) {
                    c = read();
                }
            }
            break;
        }
        return buffer.toString();
    }

    private String getsEntireStream() throws IOException {
        StringBuffer result = new StringBuffer();
        int c;
        while ((c = read()) != -1) {
            result.append((char) c);
        }
        return result.toString();
    }
}