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With inspiration from other libraries

There is a newer version: 2.12.15

/**
 * MVEL 2.0
 * Copyright (C) 2007 The Codehaus
 * Mike Brock, Dhanji Prasanna, John Graham, Mark Proctor
 *
 * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.mvel2.templates.res;

import org.mvel2.MVEL;
import org.mvel2.integration.VariableResolverFactory;
import org.mvel2.templates.TemplateRuntime;
import org.mvel2.templates.util.TemplateOutputStream;

public class CodeNode extends Node {
  public CodeNode() {
  }

  private int start;
  private int offset;

  public CodeNode(int begin, String name, char[] template, int start, int end) {
    this.begin = begin;
    this.name = name;
    this.contents = template;
    this.start = start;
    this.offset = end - start - 1;

    //  this.contents = subset(template, this.cStart = start, (this.end = this.cEnd = end) - start - 1);
  }

  public CodeNode(int begin, String name, char[] template, int start, int end, Node next) {
    this.name = name;
    this.begin = begin;
    //     this.contents = subset(template, this.cStart = start, (this.end = this.cEnd = end) - start - 1);
    this.next = next;
    this.start = start;
    this.offset = end - start - 1;
  }

  public Object eval(TemplateRuntime runtime, TemplateOutputStream appender, Object ctx, VariableResolverFactory factory) {
    MVEL.eval(contents, start, offset, ctx, factory);
    return next != null ? next.eval(runtime, appender, ctx, factory) : null;
  }

  public boolean demarcate(Node terminatingNode, char[] template) {
    return false;
  }

  public String toString() {
    return "CodeNode:" + name + "{" + (contents == null ? "" : new String(contents)) + "} (start=" + begin + ";end=" + end + ")";
  }
}