001/* Generated By:JavaCC: Do not edit this line. ParseException.java Version 3.0 */
002/**
003 *
004 * Licensed to the Apache Software Foundation (ASF) under one or more
005 * contributor license agreements.  See the NOTICE file distributed with
006 * this work for additional information regarding copyright ownership.
007 * The ASF licenses this file to You under the Apache License, Version 2.0
008 * (the "License"); you may not use this file except in compliance with
009 * the License.  You may obtain a copy of the License at
010 *
011 * http://www.apache.org/licenses/LICENSE-2.0
012 *
013 * Unless required by applicable law or agreed to in writing, software
014 * distributed under the License is distributed on an "AS IS" BASIS,
015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016 * See the License for the specific language governing permissions and
017 * limitations under the License.
018 */
019
020package org.granite.gravity.selector;
021
022/**
023 * This exception is thrown when parse errors are encountered.
024 * You can explicitly create objects of this exception type by
025 * calling the method generateParseException in the generated
026 * parser.
027 *
028 * You can modify this class to customize your error reporting
029 * mechanisms so long as you retain the public fields.
030 */
031public class ParseException extends Exception {
032
033    private static final long serialVersionUID = 1L;
034
035/**
036   * This constructor is used by the method "generateParseException"
037   * in the generated parser.  Calling this constructor generates
038   * a new object of this type with the fields "currentToken",
039   * "expectedTokenSequences", and "tokenImage" set.  The boolean
040   * flag "specialConstructor" is also set to true to indicate that
041   * this constructor was used to create this object.
042   * This constructor calls its super class with the empty string
043   * to force the "toString" method of parent class "Throwable" to
044   * print the error message in the form:
045   *     ParseException: <result of getMessage>
046   */
047  public ParseException(Token currentTokenVal,
048                        int[][] expectedTokenSequencesVal,
049                        String[] tokenImageVal
050                       )
051  {
052    super("");
053    specialConstructor = true;
054    currentToken = currentTokenVal;
055    expectedTokenSequences = expectedTokenSequencesVal;
056    tokenImage = tokenImageVal;
057  }
058
059  /**
060   * The following constructors are for use by you for whatever
061   * purpose you can think of.  Constructing the exception in this
062   * manner makes the exception behave in the normal way - i.e., as
063   * documented in the class "Throwable".  The fields "errorToken",
064   * "expectedTokenSequences", and "tokenImage" do not contain
065   * relevant information.  The JavaCC generated code does not use
066   * these constructors.
067   */
068
069  public ParseException() {
070    super();
071    specialConstructor = false;
072  }
073
074  public ParseException(String message) {
075    super(message);
076    specialConstructor = false;
077  }
078
079  /**
080   * This variable determines which constructor was used to create
081   * this object and thereby affects the semantics of the
082   * "getMessage" method (see below).
083   */
084  protected boolean specialConstructor;
085
086  /**
087   * This is the last token that has been consumed successfully.  If
088   * this object has been created due to a parse error, the token
089   * followng this token will (therefore) be the first error token.
090   */
091  public Token currentToken;
092
093  /**
094   * Each entry in this array is an array of integers.  Each array
095   * of integers represents a sequence of tokens (by their ordinal
096   * values) that is expected at this point of the parse.
097   */
098  public int[][] expectedTokenSequences;
099
100  /**
101   * This is a reference to the "tokenImage" array of the generated
102   * parser within which the parse error occurred.  This array is
103   * defined in the generated ...Constants interface.
104   */
105  public String[] tokenImage;
106
107  /**
108   * This method has the standard behavior when this object has been
109   * created using the standard constructors.  Otherwise, it uses
110   * "currentToken" and "expectedTokenSequences" to generate a parse
111   * error message and returns it.  If this object has been created
112   * due to a parse error, and you do not catch it (it gets thrown
113   * from the parser), then this method is called during the printing
114   * of the final stack trace, and hence the correct error message
115   * gets displayed.
116   */
117  @Override
118  public String getMessage() {
119    if (!specialConstructor) {
120      return super.getMessage();
121    }
122    StringBuffer expected = new StringBuffer();
123    int maxSize = 0;
124    for (int i = 0; i < expectedTokenSequences.length; i++) {
125      if (maxSize < expectedTokenSequences[i].length) {
126        maxSize = expectedTokenSequences[i].length;
127      }
128      for (int j = 0; j < expectedTokenSequences[i].length; j++) {
129        expected.append(tokenImage[expectedTokenSequences[i][j]]).append(" ");
130      }
131      if (expectedTokenSequences[i][expectedTokenSequences[i].length - 1] != 0) {
132        expected.append("...");
133      }
134      expected.append(eol).append("    ");
135    }
136    String retval = "Encountered \"";
137    Token tok = currentToken.next;
138    for (int i = 0; i < maxSize; i++) {
139      if (i != 0) retval += " ";
140      if (tok.kind == 0) {
141        retval += tokenImage[0];
142        break;
143      }
144      retval += add_escapes(tok.image);
145      tok = tok.next;
146    }
147    retval += "\" at line " + currentToken.next.beginLine + ", column " + currentToken.next.beginColumn;
148    retval += "." + eol;
149    if (expectedTokenSequences.length == 1) {
150      retval += "Was expecting:" + eol + "    ";
151    } else {
152      retval += "Was expecting one of:" + eol + "    ";
153    }
154    retval += expected.toString();
155    return retval;
156  }
157
158  /**
159   * The end of line string for this machine.
160   */
161  protected String eol = System.getProperty("line.separator", "\n");
162
163  /**
164   * Used to convert raw characters to their escaped version
165   * when these raw version cannot be used as part of an ASCII
166   * string literal.
167   */
168  protected String add_escapes(String str) {
169      StringBuffer retval = new StringBuffer();
170      char ch;
171      for (int i = 0; i < str.length(); i++) {
172        switch (str.charAt(i))
173        {
174           case 0 :
175              continue;
176           case '\b':
177              retval.append("\\b");
178              continue;
179           case '\t':
180              retval.append("\\t");
181              continue;
182           case '\n':
183              retval.append("\\n");
184              continue;
185           case '\f':
186              retval.append("\\f");
187              continue;
188           case '\r':
189              retval.append("\\r");
190              continue;
191           case '\"':
192              retval.append("\\\"");
193              continue;
194           case '\'':
195              retval.append("\\\'");
196              continue;
197           case '\\':
198              retval.append("\\\\");
199              continue;
200           default:
201              if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) {
202                 String s = "0000" + Integer.toString(ch, 16);
203                 retval.append("\\u" + s.substring(s.length() - 4, s.length()));
204              } else {
205                 retval.append(ch);
206              }
207              continue;
208        }
209      }
210      return retval.toString();
211   }
212
213}