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/bundles/plugins-trunk/XML/sidekick/css/parser/ParseException.java

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Java | 192 lines | 111 code | 12 blank | 69 comment | 16 complexity | 60a37611ffca0c4f9ea29239b899029e MD5 | raw file
  1/* Generated By:JavaCC: Do not edit this line. ParseException.java Version 3.0 */
  2package sidekick.css.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 */
 13public 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}