| /******************************************************************************* |
| * Copyright (c) 2007 University of Illinois at Urbana-Champaign and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * UIUC - Initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.photran.internal.core.lexer; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| /** |
| * Wraps another <code>InputStream</code>, and, if the wrapped stream does not end |
| * with an end-of-line character, appends the OS-dependent end-of-line sequence to |
| * the end of the stream. |
| * |
| * @author Jeff Overbey |
| */ |
| public final class LineAppendingInputStream extends InputStream |
| { |
| private InputStream originalInputStream; |
| private InputStream eolInputStream; |
| private InputStream currentInputStream; |
| |
| private int lastChar = -1; |
| |
| public LineAppendingInputStream(InputStream streamToWrap) |
| { |
| this.originalInputStream = streamToWrap; |
| this.eolInputStream = new EOLInputStream(); |
| |
| this.currentInputStream = originalInputStream; |
| } |
| |
| @Override |
| public int read() throws IOException |
| { |
| int result = currentInputStream.read(); |
| |
| if (result == -1 && currentInputStream == originalInputStream && !isEOL(lastChar)) |
| { |
| currentInputStream = eolInputStream; |
| result = currentInputStream.read(); |
| } |
| else |
| { |
| lastChar = result; |
| } |
| |
| return result; |
| } |
| |
| private boolean isEOL(int c) |
| { |
| return c =='\n' || c == '\r'; |
| } |
| |
| private static class EOLInputStream extends InputStream |
| { |
| private static final byte[] EOL = System.getProperty("line.separator").getBytes(); |
| private int eolByte = 0; |
| |
| @Override |
| public int read() throws IOException |
| { |
| return eolByte < EOL.length ? EOL[eolByte++] : -1; |
| } |
| |
| } |
| } |