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    1   /* Generated By:JavaCC: Do not edit this line. ParseException.java Version 0.7pre6 */
    2   package net.bonzoun.cocodonkey;
    3   
    4   /**
    5    * This exception is thrown when parse errors are encountered.
    6    * You can explicitly create objects of this exception type by
    7    * calling the method generateParseException in the generated
    8    * parser.
    9    *
   10    * You can modify this class to customize your error reporting
   11    * mechanisms so long as you retain the public fields.
   12    */
   13   public class ParseException extends Exception {
   14   
   15     /**
   16      * This constructor is used by the method "generateParseException"
   17      * in the generated parser.  Calling this constructor generates
   18      * a new object of this type with the fields "currentToken",
   19      * "expectedTokenSequences", and "tokenImage" set.  The boolean
   20      * flag "specialConstructor" is also set to true to indicate that
   21      * this constructor was used to create this object.
   22      * This constructor calls its super class with the empty string
   23      * to force the "toString" method of parent class "Throwable" to
   24      * print the error message in the form:
   25      *     ParseException: <result of getMessage>
   26      */
   27     public ParseException(Token currentTokenVal,
   28                           int[][] expectedTokenSequencesVal,
   29                           String[] tokenImageVal
   30                          )
   31     {
   32       super("");
   33       specialConstructor = true;
   34       currentToken = currentTokenVal;
   35       expectedTokenSequences = expectedTokenSequencesVal;
   36       tokenImage = tokenImageVal;
   37     }
   38   
   39     /**
   40      * The following constructors are for use by you for whatever
   41      * purpose you can think of.  Constructing the exception in this
   42      * manner makes the exception behave in the normal way - i.e., as
   43      * documented in the class "Throwable".  The fields "errorToken",
   44      * "expectedTokenSequences", and "tokenImage" do not contain
   45      * relevant information.  The JavaCC generated code does not use
   46      * these constructors.
   47      */
   48   
   49     public ParseException() {
   50       super();
   51       specialConstructor = false;
   52     }
   53   
   54     public ParseException(String message) {
   55       super(message);
   56       specialConstructor = false;
   57     }
   58   
   59     /**
   60      * This variable determines which constructor was used to create
   61      * this object and thereby affects the semantics of the
   62      * "getMessage" method (see below).
   63      */
   64     protected boolean specialConstructor;
   65   
   66     /**
   67      * This is the last token that has been consumed successfully.  If
   68      * this object has been created due to a parse error, the token
   69      * followng this token will (therefore) be the first error token.
   70      */
   71     public Token currentToken;
   72   
   73     /**
   74      * Each entry in this array is an array of integers.  Each array
   75      * of integers represents a sequence of tokens (by their ordinal
   76      * values) that is expected at this point of the parse.
   77      */
   78     public int[][] expectedTokenSequences;
   79   
   80     /**
   81      * This is a reference to the "tokenImage" array of the generated
   82      * parser within which the parse error occurred.  This array is
   83      * defined in the generated ...Constants interface.
   84      */
   85     public String[] tokenImage;
   86   
   87     /**
   88      * This method has the standard behavior when this object has been
   89      * created using the standard constructors.  Otherwise, it uses
   90      * "currentToken" and "expectedTokenSequences" to generate a parse
   91      * error message and returns it.  If this object has been created
   92      * due to a parse error, and you do not catch it (it gets thrown
   93      * from the parser), then this method is called during the printing
   94      * of the final stack trace, and hence the correct error message
   95      * gets displayed.
   96      */
   97     public String getMessage() {
   98       if (!specialConstructor) {
   99         return super.getMessage();
  100       }
  101       String expected = "";
  102       int maxSize = 0;
  103       for (int i = 0; i < expectedTokenSequences.length; i++) {
  104         if (maxSize < expectedTokenSequences[i].length) {
  105           maxSize = expectedTokenSequences[i].length;
  106         }
  107         for (int j = 0; j < expectedTokenSequences[i].length; j++) {
  108           expected += tokenImage[expectedTokenSequences[i][j]] + " ";
  109         }
  110         if (expectedTokenSequences[i][expectedTokenSequences[i].length - 1] != 0) {
  111           expected += "...";
  112         }
  113         expected += eol + "    ";
  114       }
  115       String retval = "Encountered \"";
  116       Token tok = currentToken.next;
  117       for (int i = 0; i < maxSize; i++) {
  118         if (i != 0) retval += " ";
  119         if (tok.kind == 0) {
  120           retval += tokenImage[0];
  121           break;
  122         }
  123         retval += add_escapes(tok.image);
  124         tok = tok.next; 
  125       }
  126       retval += "\" at line " + currentToken.next.beginLine + ", column " + currentToken.next.beginColumn + "." + eol;
  127       if (expectedTokenSequences.length == 1) {
  128         retval += "Was expecting:" + eol + "    ";
  129       } else {
  130         retval += "Was expecting one of:" + eol + "    ";
  131       }
  132       retval += expected;
  133       return retval;
  134     }
  135   
  136     /**
  137      * The end of line string for this machine.
  138      */
  139     protected String eol = System.getProperty("line.separator", "\n");
  140    
  141     /**
  142      * Used to convert raw characters to their escaped version
  143      * when these raw version cannot be used as part of an ASCII
  144      * string literal.
  145      */
  146     protected String add_escapes(String str) {
  147         StringBuffer retval = new StringBuffer();
  148         char ch;
  149         for (int i = 0; i < str.length(); i++) {
  150           switch (str.charAt(i))
  151           {
  152              case 0 :
  153                 continue;
  154              case '\b':
  155                 retval.append("\\b");
  156                 continue;
  157              case '\t':
  158                 retval.append("\\t");
  159                 continue;
  160              case '\n':
  161                 retval.append("\\n");
  162                 continue;
  163              case '\f':
  164                 retval.append("\\f");
  165                 continue;
  166              case '\r':
  167                 retval.append("\\r");
  168                 continue;
  169              case '\"':
  170                 retval.append("\\\"");
  171                 continue;
  172              case '\'':
  173                 retval.append("\\\'");
  174                 continue;
  175              case '\\':
  176                 retval.append("\\\\");
  177                 continue;
  178              default:
  179                 if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) {
  180                    String s = "0000" + Integer.toString(ch, 16);
  181                    retval.append("\\u" + s.substring(s.length() - 4, s.length()));
  182                 } else {
  183                    retval.append(ch);
  184                 }
  185                 continue;
  186           }
  187         }
  188         return retval.toString();
  189      }
  190   
  191   }

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