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   *  or more contributor license agreements.  See the NOTICE file
   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF licenses this file
   *  to you 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
   *
   *    https://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.apache.cayenne.template.parser;
  
  /**
   * Token Manager Error.
   */
  public class TokenMgrError extends Error {
  
      /**
       * The version identifier for this Serializable class.
       * Increment only if the <i>serialized</i> form of the
       * class changes.
       */
      private static final long serialVersionUID = 1L;
  
    /*
     * Ordinals for various reasons why an Error of this type can be thrown.
     */
  
      /**
       * Lexical error occurred.
       */
      static final int LEXICAL_ERROR = 0;
  
      /**
       * An attempt was made to create a second instance of a static token manager.
       */
      static final int STATIC_LEXER_ERROR = 1;
  
      /**
       * Tried to change to an invalid lexical state.
       */
      static final int INVALID_LEXICAL_STATE = 2;
  
      /**
       * Detected (and bailed out of) an infinite loop in the token manager.
       */
      static final int LOOP_DETECTED = 3;
  
      /**
       * Indicates the reason why the exception is thrown. It will have
       * one of the above 4 values.
       */
      int errorCode;
  
      /**
       * Replaces unprintable characters by their escaped (or unicode escaped)
       * equivalents in the given string
       */
      protected static String addEscapes(String str) {
          StringBuilder retval = new StringBuilder();
          char ch;
          for (int i = 0; i < str.length(); i++) {
              switch (str.charAt(i)) {
                  case 0:
                      continue;
                  case '\b':
                      retval.append("\\b");
                      continue;
                  case '\t':
                      retval.append("\\t");
                      continue;
                  case '\n':
                      retval.append("\\n");
                      continue;
                  case '\f':
                      retval.append("\\f");
                      continue;
                  case '\r':
                      retval.append("\\r");
                      continue;
                  case '\"':
                      retval.append("\\\"");
                      continue;
                  case '\'':
                      retval.append("\\\'");
                      continue;
                  case '\\':
                      retval.append("\\\\");
                      continue;
                  default:
                      if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) {
                          String s = "0000" + Integer.toString(ch, 16);
                          retval.append("\\u").append(s.substring(s.length() - 4, s.length()));
                      } else {
                          retval.append(ch);
                      }
              }
          }
          return retval.toString();
      }
  
      /**
       * Returns a detailed message for the Error when it is thrown by the
       * token manager to indicate a lexical error.
       * Parameters :
       * EOFSeen     : indicates if EOF caused the lexical error
       * curLexState : lexical state in which this error occurred
       * errorLine   : line number when the error occurred
       * errorColumn : column number when the error occurred
       * errorAfter  : prefix that was seen before this error occurred
       * curchar     : the offending character
       * Note: You can customize the lexical error message by modifying this method.
       */
      protected static String LexicalError(boolean EOFSeen, int lexState, int errorLine, int errorColumn, String errorAfter, char curChar) {
          return ("Lexical error at line " +
                  errorLine + ", column " +
                  errorColumn + ".  Encountered: " +
                  (EOFSeen ? "<EOF> " : ("\"" + addEscapes(String.valueOf(curChar)) + "\"") + " (" + (int) curChar + "), ") +
                  "after : \"" + addEscapes(errorAfter) + "\"");
      }
  
      /**
       * You can also modify the body of this method to customize your error messages.
       * For example, cases like LOOP_DETECTED and INVALID_LEXICAL_STATE are not
       * of end-users concern, so you can return something like :
       * <p>
       * "Internal Error : Please file a bug report .... "
       * <p>
       * from this method for such cases in the release version of your parser.
       */
      public String getMessage() {
          return super.getMessage();
      }
  
    /*
     * Constructors of various flavors follow.
     */
  
      /**
       * No arg constructor.
       */
      public TokenMgrError() {
      }
  
      /**
       * Constructor with message and reason.
       */
      public TokenMgrError(String message, int reason) {
          super(message);
          errorCode = reason;
      }
  
      /**
       * Full Constructor.
       */
      public TokenMgrError(boolean EOFSeen, int lexState, int errorLine, int errorColumn, String errorAfter, char curChar, int reason) {
          this(LexicalError(EOFSeen, lexState, errorLine, errorColumn, errorAfter, curChar), reason);
      }
  }
  