fix(#75): got rid of ANTLR

pom.xml

@@ -96,11 +96,6 @@ OF THE POSSIBILITY OF SUCH DAMAGE.
       <artifactId>lombok</artifactId>
       <version>1.18.30</version>
     </dependency>
-    <dependency>
-      <groupId>org.antlr</groupId>
-      <artifactId>antlr4-runtime</artifactId>
-      <version>4.13.1</version>
-    </dependency>
     <dependency>
       <groupId>org.mockito</groupId>
       <artifactId>mockito-core</artifactId>

src/main/java/org/xembly/Callback.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2013-2023, xembly.org
+ * 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) Neither the name of the xembly.org nor
+ * the names of its contributors may be used to endorse or promote
+ * products derived from this software without specific prior written
+ * permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "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 COPYRIGHT HOLDER OR CONTRIBUTORS 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.xembly;
+
+/**
+ * A task that returns a result and may throw an {@link XmlContentException}.
+ * @param <V> Type of computed result
+ * @since 0.31.0
+ */
+public interface Callback<V> {
+    /**
+     * Computes a result.
+     * @return The computed result
+     * @throws XmlContentException If unable to compute a result
+     */
+    V call() throws XmlContentException;
+}

src/main/java/org/xembly/ParsingException.java

@@ -34,7 +34,7 @@
  *
  * @since 0.6
  */
-final class ParsingException extends RuntimeException {
+final class ParsingException extends Exception {
 
     /**
      * Serialization marker.
@@ -45,8 +45,7 @@ final class ParsingException extends RuntimeException {
      * Public ctor.
      * @param cause Cause of it
      */
-    ParsingException(final Throwable cause) {
+    ParsingException(final String cause) {
         super(cause);
     }
-
 }