001 /* Generated By:JavaCC: Do not edit this line. TokenMgrError.java Version 5.0 */
002 /* JavaCCOptions: */
003 package org.descripter.js.parse;
004 
005 /** Token Manager Error. */
006 public class TokenMgrError extends Error
007 {
008 
009   /**
010    * The version identifier for this Serializable class.
011    * Increment only if the <i>serialized</i> form of the
012    * class changes.
013    */
014   private static final long serialVersionUID = 1L;
015 
016   /*
017    * Ordinals for various reasons why an Error of this type can be thrown.
018    */
019 
020   /**
021    * Lexical error occurred.
022    */
023   static final int LEXICAL_ERROR = 0;
024 
025   /**
026    * An attempt was made to create a second instance of a static token manager.
027    */
028   static final int STATIC_LEXER_ERROR = 1;
029 
030   /**
031    * Tried to change to an invalid lexical state.
032    */
033   static final int INVALID_LEXICAL_STATE = 2;
034 
035   /**
036    * Detected (and bailed out of) an infinite loop in the token manager.
037    */
038   static final int LOOP_DETECTED = 3;
039 
040   /**
041    * Indicates the reason why the exception is thrown. It will have
042    * one of the above 4 values.
043    */
044   int errorCode;
045 
046   /**
047    * Replaces unprintable characters by their escaped (or unicode escaped)
048    * equivalents in the given string
049    */
050   protected static final String addEscapes(String str) {
051     StringBuffer retval = new StringBuffer();
052     char ch;
053     for (int i = 0; i < str.length(); i++) {
054       switch (str.charAt(i))
055       {
056         case 0 :
057           continue;
058         case '\b':
059           retval.append("\\b");
060           continue;
061         case '\t':
062           retval.append("\\t");
063           continue;
064         case '\n':
065           retval.append("\\n");
066           continue;
067         case '\f':
068           retval.append("\\f");
069           continue;
070         case '\r':
071           retval.append("\\r");
072           continue;
073         case '\"':
074           retval.append("\\\"");
075           continue;
076         case '\'':
077           retval.append("\\\'");
078           continue;
079         case '\\':
080           retval.append("\\\\");
081           continue;
082         default:
083           if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) {
084             String s = "0000" + Integer.toString(ch, 16);
085             retval.append("\\u" + s.substring(s.length() - 4, s.length()));
086           } else {
087             retval.append(ch);
088           }
089           continue;
090       }
091     }
092     return retval.toString();
093   }
094 
095   /**
096    * Returns a detailed message for the Error when it is thrown by the
097    * token manager to indicate a lexical error.
098    * Parameters :
099    *    EOFSeen     : indicates if EOF caused the lexical error
100    *    curLexState : lexical state in which this error occurred
101    *    errorLine   : line number when the error occurred
102    *    errorColumn : column number when the error occurred
103    *    errorAfter  : prefix that was seen before this error occurred
104    *    curchar     : the offending character
105    * Note: You can customize the lexical error message by modifying this method.
106    */
107   protected static String LexicalError(boolean EOFSeen, int lexState, int errorLine, int errorColumn, String errorAfter, char curChar) {
108     return("Lexical error at line " +
109           errorLine + ", column " +
110           errorColumn + ".  Encountered: " +
111           (EOFSeen ? "<EOF> " : ("\"" + addEscapes(String.valueOf(curChar)) + "\"") + " (" + (int)curChar + "), ") +
112           "after : \"" + addEscapes(errorAfter) + "\"");
113   }
114 
115   /**
116    * You can also modify the body of this method to customize your error messages.
117    * For example, cases like LOOP_DETECTED and INVALID_LEXICAL_STATE are not
118    * of end-users concern, so you can return something like :
119    *
120    *     "Internal Error : Please file a bug report .... "
121    *
122    * from this method for such cases in the release version of your parser.
123    */
124   public String getMessage() {
125     return super.getMessage();
126   }
127 
128   /*
129    * Constructors of various flavors follow.
130    */
131 
132   /** No arg constructor. */
133   public TokenMgrError() {
134   }
135 
136   /** Constructor with message and reason. */
137   public TokenMgrError(String message, int reason) {
138     super(message);
139     errorCode = reason;
140   }
141 
142   /** Full Constructor. */
143   public TokenMgrError(boolean EOFSeen, int lexState, int errorLine, int errorColumn, String errorAfter, char curChar, int reason) {
144     this(LexicalError(EOFSeen, lexState, errorLine, errorColumn, errorAfter, curChar), reason);
145   }
146 }