001    /* Generated By:JavaCC: Do not edit this line. TokenMgrError.java Version 3.0 */
002    package net.hydromatic.clapham.parser.bnf;
003    
004    public 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; i < str.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       protected static 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    }