http://nexus.sonatype.org/oss-repository-hosting.html/ST4: StringTemplate is a java template engine for generating source code, web pages, emails, or any other formatted text output. StringTemplate is particularly good at multi-targeted code generators, multiple site skins, and internationalization/localization. It evolved over years of effort developing jGuru.com. StringTemplate also powers the ANTLR 3 and 4 code generator. Its distinguishing characteristic is that unlike other engines, it strictly enforces model-view separation. Strict separation makes websites and code generators more flexible and maintainable; it also provides an excellent defense against malicious template authors. 
/*
 * [The "BSD license"]
 *  Copyright (c) 2011 Terence Parr
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *  3. The name of the author may not be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 *  IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 *  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.stringtemplate.v4.debug;

import org.stringtemplate.v4.InstanceScope;

public class EvalExprEvent extends InterpEvent {
	
Index of first char in template. 
/** Index of first char in template. */
	public final int exprStartChar;
	
Index of last char in template (inclusive). 
/** Index of last char in template (inclusive). */
	public final int exprStopChar;
	public final String expr;
	public EvalExprEvent(InstanceScope scope, int start, int stop,
						 int exprStartChar, int exprStopChar)
	{
		super(scope, start, stop);
		this.exprStartChar = exprStartChar;
		this.exprStopChar = exprStopChar;
		if ( exprStartChar >=0 && exprStopChar >=0 ) {
			expr = scope.st.impl.template.substring(exprStartChar, exprStopChar +1);
		}
		else {
			expr = "";
		}
	}

	@Override
	public String toString() {
		return getClass().getSimpleName()+"{" +
			   "self=" + scope.st +
			   ", expr='" + expr + '\'' +
			   ", exprStartChar=" + exprStartChar +
			   ", exprStopChar=" + exprStopChar +
			   ", start=" + outputStartChar +
			   ", stop=" + outputStopChar +
			   '}';
	}

}