content: /*
   * Copyright © 2018-2025 Commonwealth Scientific and Industrial Research
   * Organisation (CSIRO) ABN 41 687 119 230.
   *
   * 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 au.csiro.pathling.fhirpath.parser;
  
  import au.csiro.pathling.errors.InvalidUserInputError;
  import jakarta.annotation.Nullable;
  import org.antlr.v4.runtime.BaseErrorListener;
  import org.antlr.v4.runtime.RecognitionException;
  import org.antlr.v4.runtime.Recognizer;
  
  /**
   * This is a custom error listener for capturing parse errors and wrapping them in an invalid
   * request exception.
   *
   * @author John Grimes
   */
  public class ParserErrorListener extends BaseErrorListener {
  
    @Override
    public void syntaxError(@Nullable final Recognizer<?, ?> recognizer,
        @Nullable final Object offendingSymbol, final int line, final int charPositionInLine,
        @Nullable final String msg, @Nullable final RecognitionException e) {
      final StringBuilder sb = new StringBuilder();
      sb.append("Error parsing FHIRPath expression (line: ");
      sb.append(line);
      sb.append(", position: ");
      sb.append(charPositionInLine);
      sb.append(")");
      if (msg != null) {
        sb.append(": ");
        sb.append(msg);
      }
      throw new InvalidUserInputError(sb.toString());
    }
  
  }
  