View Javadoc

    1   /* Generated By:JavaCC: Do not edit this line. ParseException.java Version 3.0 */
    2   /***
    3    * JSP Parser for PMD.
    4    * @author Pieter � Application Engineers NV/SA � http://www.ae.be
    5    */
    6
    7   package net.sourceforge.pmd.jsp.ast;
    8
    9   /***
    10   * This exception is thrown when parse errors are encountered.
    11   * You can explicitly create objects of this exception type by
    12   * calling the method generateParseException in the generated
    13   * parser.
    14   * <p/>
    15   * You can modify this class to customize your error reporting
    16   * mechanisms so long as you retain the public fields.
    17   */
    18  public class ParseException extends net.sourceforge.pmd.ast.ParseException {
    19
    20      /***
    21       * This constructor is used by the method "generateParseException"
    22       * in the generated parser.  Calling this constructor generates
    23       * a new object of this type with the fields "currentToken",
    24       * "expectedTokenSequences", and "tokenImage" set.  The boolean
    25       * flag "specialConstructor" is also set to true to indicate that
    26       * this constructor was used to create this object.
    27       * This constructor calls its super class with the empty string
    28       * to force the "toString" method of parent class "Throwable" to
    29       * print the error message in the form:
    30       * ParseException: <result of getMessage>
    31       */
    32      public ParseException(Token currentTokenVal,
    33                            int[][] expectedTokenSequencesVal,
    34                            String[] tokenImageVal) {
    35          super("");
    36          specialConstructor = true;
    37          currentToken = currentTokenVal;
    38          expectedTokenSequences = expectedTokenSequencesVal;
    39          tokenImage = tokenImageVal;
    40      }
    41
    42      /***
    43       * The following constructors are for use by you for whatever
    44       * purpose you can think of.  Constructing the exception in this
    45       * manner makes the exception behave in the normal way - i.e., as
    46       * documented in the class "Throwable".  The fields "errorToken",
    47       * "expectedTokenSequences", and "tokenImage" do not contain
    48       * relevant information.  The JavaCC generated code does not use
    49       * these constructors.
    50       */
    51
    52      public ParseException() {
    53          super();
    54          specialConstructor = false;
    55      }
    56
    57      public ParseException(String message) {
    58          super(message);
    59          specialConstructor = false;
    60      }
    61
    62      /***
    63       * This variable determines which constructor was used to create
    64       * this object and thereby affects the semantics of the
    65       * "getMessage" method (see below).
    66       */
    67      protected boolean specialConstructor;
    68
    69      /***
    70       * This is the last token that has been consumed successfully.  If
    71       * this object has been created due to a parse error, the token
    72       * followng this token will (therefore) be the first error token.
    73       */
    74      public Token currentToken;
    75
    76      /***
    77       * Each entry in this array is an array of integers.  Each array
    78       * of integers represents a sequence of tokens (by their ordinal
    79       * values) that is expected at this point of the parse.
    80       */
    81      public int[][] expectedTokenSequences;
    82
    83      /***
    84       * This is a reference to the "tokenImage" array of the generated
    85       * parser within which the parse error occurred.  This array is
    86       * defined in the generated ...Constants interface.
    87       */
    88      public String[] tokenImage;
    89
    90      /***
    91       * This method has the standard behavior when this object has been
    92       * created using the standard constructors.  Otherwise, it uses
    93       * "currentToken" and "expectedTokenSequences" to generate a parse
    94       * error message and returns it.  If this object has been created
    95       * due to a parse error, and you do not catch it (it gets thrown
    96       * from the parser), then this method is called during the printing
    97       * of the final stack trace, and hence the correct error message
    98       * gets displayed.
    99       */
    100     public String getMessage() {
    101         if (!specialConstructor) {
    102             return super.getMessage();
    103         }
    104         String expected = "";
    105         int maxSize = 0;
    106         for (int i = 0; i < expectedTokenSequences.length; i++) {
    107             if (maxSize < expectedTokenSequences[i].length) {
    108                 maxSize = expectedTokenSequences[i].length;
    109             }
    110             for (int j = 0; j < expectedTokenSequences[i].length; j++) {
    111                 expected += tokenImage[expectedTokenSequences[i][j]] + " ";
    112             }
    113             if (expectedTokenSequences[i][expectedTokenSequences[i].length - 1] != 0) {
    114                 expected += "...";
    115             }
    116             expected += eol + "    ";
    117         }
    118         String retval = "Encountered \"";
    119         Token tok = currentToken.next;
    120         for (int i = 0; i < maxSize; i++) {
    121             if (i != 0) retval += " ";
    122             if (tok.kind == 0) {
    123                 retval += tokenImage[0];
    124                 break;
    125             }
    126             retval += add_escapes(tok.image);
    127             tok = tok.next;
    128         }
    129         retval += "\" at line " + currentToken.next.beginLine + ", column " + currentToken.next.beginColumn;
    130         retval += "." + eol;
    131         if (expectedTokenSequences.length == 1) {
    132             retval += "Was expecting:" + eol + "    ";
    133         } else {
    134             retval += "Was expecting one of:" + eol + "    ";
    135         }
    136         retval += expected;
    137         return retval;
    138     }
    139
    140     /***
    141      * The end of line string for this machine.
    142      */
    143     protected String eol = System.getProperty("line.separator", "\n");
    144
    145     /***
    146      * Used to convert raw characters to their escaped version
    147      * when these raw version cannot be used as part of an ASCII
    148      * string literal.
    149      */
    150     protected String add_escapes(String str) {
    151         StringBuffer retval = new StringBuffer();
    152         char ch;
    153         for (int i = 0; i < str.length(); i++) {
    154             switch (str.charAt(i)) {
    155                 case 0:
    156                     continue;
    157                 case '\b':
    158                     retval.append("//b");
    159                     continue;
    160                 case '\t':
    161                     retval.append("//t");
    162                     continue;
    163                 case '\n':
    164                     retval.append("//n");
    165                     continue;
    166                 case '\f':
    167                     retval.append("//f");
    168                     continue;
    169                 case '\r':
    170                     retval.append("//r");
    171                     continue;
    172                 case '\"':
    173                     retval.append("//\"");
    174                     continue;
    175                 case '\'':
    176                     retval.append("//\'");
    177                     continue;
    178                 case '//':
    179                     retval.append("////");
    180                     continue;
    181                 default:
    182                     if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) {
    183                         String s = "0000" + Integer.toString(ch, 16);
    184                         retval.append("//u" + s.substring(s.length() - 4, s.length()));
    185                     } else {
    186                         retval.append(ch);
    187                     }
    188                     continue;
    189             }
    190         }
    191         return retval.toString();
    192     }
    193
    194 }