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AspectJ tools most notably contains the AspectJ compiler (AJC). AJC applies aspects to Java classes during compilation, fully replacing Javac for plain Java classes and also compiling native AspectJ or annotation-based @AspectJ syntax. Furthermore, AJC can weave aspects into existing class files in a post-compile binary weaving step. This library is a superset of AspectJ weaver and hence also of AspectJ runtime.

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/*******************************************************************************
 * Copyright (c) 2000, 2008 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jface.text;


/**
 * Standard implementation of {@link org.eclipse.jface.text.ILineTracker}.
 * 
 * The line tracker considers the three common line delimiters which are '\n',
 * '\r', '\r\n'.
 * 

 * This class is not intended to be subclassed.
 * 
 * @noextend This class is not intended to be subclassed by clients.
 */
public class DefaultLineTracker extends AbstractLineTracker {

	/** The predefined delimiters of this tracker */
	public final static String[] DELIMITERS= { "\r", "\n", "\r\n" }; //$NON-NLS-3$ //$NON-NLS-1$ //$NON-NLS-2$
	/** A predefined delimiter information which is always reused as return value */
	private DelimiterInfo fDelimiterInfo= new DelimiterInfo();


	/**
	 * Creates a standard line tracker.
	 */
	public DefaultLineTracker() {
	}

	@Override
	public String[] getLegalLineDelimiters() {
		return TextUtilities.copy(DELIMITERS);
	}

	@Override
	protected DelimiterInfo nextDelimiterInfo(String text, int offset) {

		char ch;
		int length= text.length();
		for (int i= offset; i < length; i++) {

			ch= text.charAt(i);
			if (ch == '\r') {

				if (i + 1 < length) {
					if (text.charAt(i + 1) == '\n') {
						fDelimiterInfo.delimiter= DELIMITERS[2];
						fDelimiterInfo.delimiterIndex= i;
						fDelimiterInfo.delimiterLength= 2;
						return fDelimiterInfo;
					}
				}

				fDelimiterInfo.delimiter= DELIMITERS[0];
				fDelimiterInfo.delimiterIndex= i;
				fDelimiterInfo.delimiterLength= 1;
				return fDelimiterInfo;

			} else if (ch == '\n') {

				fDelimiterInfo.delimiter= DELIMITERS[1];
				fDelimiterInfo.delimiterIndex= i;
				fDelimiterInfo.delimiterLength= 1;
				return fDelimiterInfo;
			}
		}

		return null;
	}
}