Source for org.jfree.formula.parser.ParseException

   1: /* Generated By:JavaCC: Do not edit this line. ParseException.java Version 3.0 */
   2: package org.jfree.formula.parser;
   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:     StringBuffer expected = new StringBuffer();
 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.append(tokenImage[expectedTokenSequences[i][j]]).append(' ');
 109:       }
 110:       if (expectedTokenSequences[i][expectedTokenSequences[i].length - 1] != 0) {
 111:         expected.append("...");
 112:       }
 113:       expected.append(eol).append("    ");
 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;
 127:     retval += "." + eol;
 128:     if (expectedTokenSequences.length == 1) {
 129:       retval += "Was expecting:" + eol + "    ";
 130:     } else {
 131:       retval += "Was expecting one of:" + eol + "    ";
 132:     }
 133:     retval += expected.toString();
 134:     return retval;
 135:   }
 136: 
 137:   /**
 138:    * The end of line string for this machine.
 139:    */
 140:   protected String eol = System.getProperty("line.separator", "\n");
 141:  
 142:   /**
 143:    * Used to convert raw characters to their escaped version
 144:    * when these raw version cannot be used as part of an ASCII
 145:    * string literal.
 146:    */
 147:   protected String add_escapes(String str) {
 148:       StringBuffer retval = new StringBuffer();
 149:       char ch;
 150:       for (int i = 0; i < str.length(); i++) {
 151:         switch (str.charAt(i))
 152:         {
 153:            case 0 :
 154:               continue;
 155:            case '\b':
 156:               retval.append("\\b");
 157:               continue;
 158:            case '\t':
 159:               retval.append("\\t");
 160:               continue;
 161:            case '\n':
 162:               retval.append("\\n");
 163:               continue;
 164:            case '\f':
 165:               retval.append("\\f");
 166:               continue;
 167:            case '\r':
 168:               retval.append("\\r");
 169:               continue;
 170:            case '\"':
 171:               retval.append("\\\"");
 172:               continue;
 173:            case '\'':
 174:               retval.append("\\\'");
 175:               continue;
 176:            case '\\':
 177:               retval.append("\\\\");
 178:               continue;
 179:            default:
 180:               if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) {
 181:                  String s = "0000" + Integer.toString(ch, 16);
 182:                  retval.append("\\u" + s.substring(s.length() - 4, s.length()));
 183:               } else {
 184:                  retval.append(ch);
 185:               }
 186:               continue;
 187:         }
 188:       }
 189:       return retval.toString();
 190:    }
 191: 
 192: }