ParseException


1   /**
2    * =========================================
3    * LibLayout : a free Java layouting library
4    * =========================================
5    *
6    * Project Info:  http://www.jfree.org/liblayout/
7    * Project Lead:  Thomas Morgner;
8    *
9    * (C) Copyright 2006, by Pentaho Corperation and Contributors.
10   *
11   * This library is free software; you can redistribute it and/or modify it under the terms
12   * of the GNU Lesser General Public License as published by the Free Software Foundation;
13   * either version 2.1 of the License, or (at your option) any later version.
14   *
15   * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
16   * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
17   * See the GNU Lesser General Public License for more details.
18   *
19   * You should have received a copy of the GNU Lesser General Public License along with this
20   * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
21   * Boston, MA 02111-1307, USA.
22   *
23   * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
24   * in the United States and other countries.]
25   *
26   * ------------
27   * ParseException.java
28   * ------------
29   * (C) Copyright 2006, by Pentaho Corperation.
30   *
31   * Original Author:  Thomas Morgner;
32   * Contributor(s):   -;
33   *
34   * $Id: ParseException.java,v 1.1.1.1 2006/04/23 14:51:51 taqua Exp $
35   *
36   * Changes
37   * -------
38   *
39   *
40   */
41  
42  /* Generated By:JavaCC: Do not edit this line. ParseException.java Version 3.0 */
43  package org.w3c.flute.parser;
44  
45  import org.w3c.css.sac.CSSException;
46  
47  /**
48   * This exception is thrown when parse errors are encountered.
49   * You can explicitly create objects of this exception type by
50   * calling the method generateParseException in the generated
51   * parser.
52   *
53   * You can modify this class to customize your error reporting
54   * mechanisms so long as you retain the public fields.
55   */
56  public class ParseException extends CSSException {
57  
58    /**
59     * This constructor is used by the method "generateParseException"
60     * in the generated parser.  Calling this constructor generates
61     * a new object of this type with the fields "currentToken",
62     * "expectedTokenSequences", and "tokenImage" set.  The boolean
63     * flag "specialConstructor" is also set to true to indicate that
64     * this constructor was used to create this object.
65     * This constructor calls its super class with the empty string
66     * to force the "toString" method of parent class "Throwable" to
67     * print the error message in the form:
68     *     ParseException: <result of getMessage>
69     */
70    public ParseException(Token currentTokenVal,
71                          int[][] expectedTokenSequencesVal,
72                          String  [] tokenImageVal
73                         )
74    {
75      super("");
76      specialConstructor = true;
77      currentToken = currentTokenVal;
78      expectedTokenSequences = expectedTokenSequencesVal;
79      tokenImage = tokenImageVal;
80    }
81  
82    /**
83     * The following constructors are for use by you for whatever
84     * purpose you can think of.  Constructing the exception in this
85     * manner makes the exception behave in the normal way - i.e., as
86     * documented in the class "Throwable".  The fields "errorToken",
87     * "expectedTokenSequences", and "tokenImage" do not contain
88     * relevant information.  The JavaCC generated code does not use
89     * these constructors.
90     */
91  
92    public ParseException() {
93      super();
94      specialConstructor = false;
95    }
96  
97    public ParseException(String   message) {
98      super(message);
99      specialConstructor = false;
100   }
101 
102   /**
103    * This variable determines which constructor was used to create
104    * this object and thereby affects the semantics of the
105    * "getMessage" method (see below).
106    */
107   protected boolean specialConstructor;
108 
109   /**
110    * This is the last token that has been consumed successfully.  If
111    * this object has been created due to a parse error, the token
112    * followng this token will (therefore) be the first error token.
113    */
114   public Token currentToken;
115 
116   /**
117    * Each entry in this array is an array of integers.  Each array
118    * of integers represents a sequence of tokens (by their ordinal
119    * values) that is expected at this point of the parse.
120    */
121   public int[][] expectedTokenSequences;
122 
123   /**
124    * This is a reference to the "tokenImage" array of the generated
125    * parser within which the parse error occurred.  This array is
126    * defined in the generated ...Constants interface.
127    */
128   public String  [] tokenImage;
129 
130   /**
131    * This method has the standard behavior when this object has been
132    * created using the standard constructors.  Otherwise, it uses
133    * "currentToken" and "expectedTokenSequences" to generate a parse
134    * error message and returns it.  If this object has been created
135    * due to a parse error, and you do not catch it (it gets thrown
136    * from the parser), then this method is called during the printing
137    * of the final stack trace, and hence the correct error message
138    * gets displayed.
139    */
140   public String   getMessage() {
141     if (!specialConstructor) {
142       return super.getMessage();
143     }
144     String   expected = "";
145     int maxSize = 0;
146     for (int i = 0; i < expectedTokenSequences.length; i++) {
147       if (maxSize < expectedTokenSequences[i].length) {
148         maxSize = expectedTokenSequences[i].length;
149       }
150       for (int j = 0; j < expectedTokenSequences[i].length; j++) {
151         expected += tokenImage[expectedTokenSequences[i][j]] + " ";
152       }
153       if (expectedTokenSequences[i][expectedTokenSequences[i].length - 1] != 0) {
154         expected += "...";
155       }
156       expected += eol + "    ";
157     }
158     String   retval = "Encountered \"";
159     Token tok = currentToken.next;
160     for (int i = 0; i < maxSize; i++) {
161       if (i != 0) retval += " ";
162       if (tok.kind == 0) {
163         retval += tokenImage[0];
164         break;
165       }
166       retval += add_escapes(tok.image);
167       tok = tok.next;
168     }
169     retval += "\" at line " + currentToken.next.beginLine + ", column " + currentToken.next.beginColumn;
170     retval += "." + eol;
171     if (expectedTokenSequences.length == 1) {
172       retval += "Was expecting:" + eol + "    ";
173     } else {
174       retval += "Was expecting one of:" + eol + "    ";
175     }
176     retval += expected;
177     return retval;
178   }
179 
180   /**
181    * The end of line string for this machine.
182    */
183   protected String   eol = System.getProperty("line.separator", "\n");
184 
185   /**
186    * Used to convert raw characters to their escaped version
187    * when these raw version cannot be used as part of an ASCII
188    * string literal.
189    */
190   protected String   add_escapes(String   str) {
191       StringBuffer   retval = new StringBuffer  ();
192       char ch;
193       for (int i = 0; i < str.length(); i++) {
194         switch (str.charAt(i))
195         {
196            case 0 :
197               continue;
198            case '\b':
199               retval.append("\\b");
200               continue;
201            case '\t':
202               retval.append("\\t");
203               continue;
204            case '\n':
205               retval.append("\\n");
206               continue;
207            case '\f':
208               retval.append("\\f");
209               continue;
210            case '\r':
211               retval.append("\\r");
212               continue;
213            case '\"':
214               retval.append("\\\"");
215               continue;
216            case '\'':
217               retval.append("\\\'");
218               continue;
219            case '\\':
220               retval.append("\\\\");
221               continue;
222            default:
223               if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) {
224                  String   s = "0000" + Integer.toString(ch, 16);
225                  retval.append("\\u" + s.substring(s.length() - 4, s.length()));
226               } else {
227                  retval.append(ch);
228               }
229               continue;
230         }
231       }
232       return retval.toString();
233    }
234 
235 }
236
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