001/* Generated By:JavaCC: Do not edit this line. TokenMgrError.java Version 2.1 */
002package org.apache.commons.el.parser;
003
004public class TokenMgrError extends Error
005{
006   /*
007    * Ordinals for various reasons why an Error of this type can be thrown.
008    */
009
010   /**
011    * Lexical error occured.
012    */
013   static final int LEXICAL_ERROR = 0;
014
015   /**
016    * An attempt wass made to create a second instance of a static token manager.
017    */
018   static final int STATIC_LEXER_ERROR = 1;
019
020   /**
021    * Tried to change to an invalid lexical state.
022    */
023   static final int INVALID_LEXICAL_STATE = 2;
024
025   /**
026    * Detected (and bailed out of) an infinite loop in the token manager.
027    */
028   static final int LOOP_DETECTED = 3;
029
030   /**
031    * Indicates the reason why the exception is thrown. It will have
032    * one of the above 4 values.
033    */
034   int errorCode;
035
036   /**
037    * Replaces unprintable characters by their espaced (or unicode escaped)
038    * equivalents in the given string
039    */
040   protected static final String addEscapes(String str) {
041      StringBuffer retval = new StringBuffer();
042      char ch;
043      for (int i = 0, length = str.length(); i < length; i++) {
044        switch (str.charAt(i))
045        {
046           case 0 :
047              continue;
048           case '\b':
049              retval.append("\\b");
050              continue;
051           case '\t':
052              retval.append("\\t");
053              continue;
054           case '\n':
055              retval.append("\\n");
056              continue;
057           case '\f':
058              retval.append("\\f");
059              continue;
060           case '\r':
061              retval.append("\\r");
062              continue;
063           case '\"':
064              retval.append("\\\"");
065              continue;
066           case '\'':
067              retval.append("\\\'");
068              continue;
069           case '\\':
070              retval.append("\\\\");
071              continue;
072           default:
073              if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) {
074                 String s = "0000" + Integer.toString(ch, 16);
075                 retval.append("\\u" + s.substring(s.length() - 4, s.length()));
076              } else {
077                 retval.append(ch);
078              }
079              continue;
080        }
081      }
082      return retval.toString();
083   }
084
085   /**
086    * Returns a detailed message for the Error when it is thrown by the
087    * token manager to indicate a lexical error.
088    * Parameters : 
089    *    EOFSeen     : indicates if EOF caused the lexicl error
090    *    curLexState : lexical state in which this error occured
091    *    errorLine   : line number when the error occured
092    *    errorColumn : column number when the error occured
093    *    errorAfter  : prefix that was seen before this error occured
094    *    curchar     : the offending character
095    * Note: You can customize the lexical error message by modifying this method.
096    */
097   private static final String LexicalError(boolean EOFSeen, int lexState, int errorLine, int errorColumn, String errorAfter, char curChar) {
098      return("Lexical error at line " +
099           errorLine + ", column " +
100           errorColumn + ".  Encountered: " +
101           (EOFSeen ? "<EOF> " : ("\"" + addEscapes(String.valueOf(curChar)) + "\"") + " (" + (int)curChar + "), ") +
102           "after : \"" + addEscapes(errorAfter) + "\"");
103   }
104
105   /**
106    * You can also modify the body of this method to customize your error messages.
107    * For example, cases like LOOP_DETECTED and INVALID_LEXICAL_STATE are not
108    * of end-users concern, so you can return something like : 
109    *
110    *     "Internal Error : Please file a bug report .... "
111    *
112    * from this method for such cases in the release version of your parser.
113    */
114   public String getMessage() {
115      return super.getMessage();
116   }
117
118   /*
119    * Constructors of various flavors follow.
120    */
121
122   public TokenMgrError() {
123   }
124
125   public TokenMgrError(String message, int reason) {
126      super(message);
127      errorCode = reason;
128   }
129
130   public TokenMgrError(boolean EOFSeen, int lexState, int errorLine, int errorColumn, String errorAfter, char curChar, int reason) {
131      this(LexicalError(EOFSeen, lexState, errorLine, errorColumn, errorAfter, curChar), reason);
132   }
133}