001 /**
002 * =========================================
003 * LibLayout : a free Java layouting library
004 * =========================================
005 *
006 * Project Info: http://www.jfree.org/liblayout/
007 * Project Lead: Thomas Morgner;
008 *
009 * (C) Copyright 2006, by Pentaho Corperation and Contributors.
010 *
011 * This library is free software; you can redistribute it and/or modify it under the terms
012 * of the GNU Lesser General Public License as published by the Free Software Foundation;
013 * either version 2.1 of the License, or (at your option) any later version.
014 *
015 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
016 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
017 * See the GNU Lesser General Public License for more details.
018 *
019 * You should have received a copy of the GNU Lesser General Public License along with this
020 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
021 * Boston, MA 02111-1307, USA.
022 *
023 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
024 * in the United States and other countries.]
025 *
026 * ------------
027 * ParseException.java
028 * ------------
029 * (C) Copyright 2006, by Pentaho Corperation.
030 *
031 * Original Author: Thomas Morgner;
032 * Contributor(s): -;
033 *
034 * $Id: ParseException.java,v 1.1.1.1 2006/04/23 14:51:51 taqua Exp $
035 *
036 * Changes
037 * -------
038 *
039 *
040 */
041
042 /* Generated By:JavaCC: Do not edit this line. ParseException.java Version 3.0 */
043 package org.w3c.flute.parser;
044
045 import org.w3c.css.sac.CSSException;
046
047 /**
048 * This exception is thrown when parse errors are encountered.
049 * You can explicitly create objects of this exception type by
050 * calling the method generateParseException in the generated
051 * parser.
052 *
053 * You can modify this class to customize your error reporting
054 * mechanisms so long as you retain the public fields.
055 */
056 public class ParseException extends CSSException {
057
058 /**
059 * This constructor is used by the method "generateParseException"
060 * in the generated parser. Calling this constructor generates
061 * a new object of this type with the fields "currentToken",
062 * "expectedTokenSequences", and "tokenImage" set. The boolean
063 * flag "specialConstructor" is also set to true to indicate that
064 * this constructor was used to create this object.
065 * This constructor calls its super class with the empty string
066 * to force the "toString" method of parent class "Throwable" to
067 * print the error message in the form:
068 * ParseException: <result of getMessage>
069 */
070 public ParseException(Token currentTokenVal,
071 int[][] expectedTokenSequencesVal,
072 String[] tokenImageVal
073 )
074 {
075 super("");
076 specialConstructor = true;
077 currentToken = currentTokenVal;
078 expectedTokenSequences = expectedTokenSequencesVal;
079 tokenImage = tokenImageVal;
080 }
081
082 /**
083 * The following constructors are for use by you for whatever
084 * purpose you can think of. Constructing the exception in this
085 * manner makes the exception behave in the normal way - i.e., as
086 * documented in the class "Throwable". The fields "errorToken",
087 * "expectedTokenSequences", and "tokenImage" do not contain
088 * relevant information. The JavaCC generated code does not use
089 * these constructors.
090 */
091
092 public ParseException() {
093 super();
094 specialConstructor = false;
095 }
096
097 public ParseException(String message) {
098 super(message);
099 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 }