001 /* Generated By:JavaCC: Do not edit this line. ParseException.java Version 0.7pre6 */
002
003 /*
004 * Cobertura - http://cobertura.sourceforge.net/
005 *
006 * This file was taken from JavaNCSS
007 * http://www.kclee.com/clemens/java/javancss/
008 * Copyright (C) 2000 Chr. Clemens Lee <clemens a.t kclee d.o.t com>
009 *
010 * Cobertura is free software; you can redistribute it and/or modify
011 * it under the terms of the GNU General Public License as published
012 * by the Free Software Foundation; either version 2 of the License,
013 * or (at your option) any later version.
014 *
015 * Cobertura is distributed in the hope that it will be useful, but
016 * WITHOUT ANY WARRANTY; without even the implied warranty of
017 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
018 * General Public License for more details.
019 *
020 * You should have received a copy of the GNU General Public License
021 * along with Cobertura; if not, write to the Free Software
022 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
023 * USA
024 */
025
026 package net.sourceforge.cobertura.javancss;
027
028 /**
029 * This exception is thrown when parse errors are encountered.
030 * You can explicitly create objects of this exception type by
031 * calling the method generateParseException in the generated
032 * parser.
033 *
034 * You can modify this class to customize your error reporting
035 * mechanisms so long as you retain the public fields.
036 */
037 class ParseException extends Exception
038 {
039
040 private static final long serialVersionUID = 0L;
041
042 /**
043 * This constructor is used by the method "generateParseException"
044 * in the generated parser. Calling this constructor generates
045 * a new object of this type with the fields "currentToken",
046 * "expectedTokenSequences", and "tokenImage" set. The boolean
047 * flag "specialConstructor" is also set to true to indicate that
048 * this constructor was used to create this object.
049 * This constructor calls its super class with the empty string
050 * to force the "toString" method of parent class "Throwable" to
051 * print the error message in the form:
052 * ParseException: <result of getMessage>
053 */
054 public ParseException(Token currentTokenVal, int[][] expectedTokenSequencesVal,
055 String[] tokenImageVal)
056 {
057 super("");
058 specialConstructor = true;
059 currentToken = currentTokenVal;
060 expectedTokenSequences = expectedTokenSequencesVal;
061 tokenImage = tokenImageVal;
062 }
063
064 /**
065 * The following constructors are for use by you for whatever
066 * purpose you can think of. Constructing the exception in this
067 * manner makes the exception behave in the normal way - i.e., as
068 * documented in the class "Throwable". The fields "errorToken",
069 * "expectedTokenSequences", and "tokenImage" do not contain
070 * relevant information. The JavaCC generated code does not use
071 * these constructors.
072 */
073
074 public ParseException()
075 {
076 super();
077 specialConstructor = false;
078 }
079
080 public ParseException(String message)
081 {
082 super(message);
083 specialConstructor = false;
084 }
085
086 /**
087 * This variable determines which constructor was used to create
088 * this object and thereby affects the semantics of the
089 * "getMessage" method (see below).
090 */
091 protected boolean specialConstructor;
092
093 /**
094 * This is the last token that has been consumed successfully. If
095 * this object has been created due to a parse error, the token
096 * followng this token will (therefore) be the first error token.
097 */
098 public Token currentToken;
099
100 /**
101 * Each entry in this array is an array of integers. Each array
102 * of integers represents a sequence of tokens (by their ordinal
103 * values) that is expected at this point of the parse.
104 */
105 public int[][] expectedTokenSequences;
106
107 /**
108 * This is a reference to the "tokenImage" array of the generated
109 * parser within which the parse error occurred. This array is
110 * defined in the generated ...Constants interface.
111 */
112 public String[] tokenImage;
113
114 /**
115 * This method has the standard behavior when this object has been
116 * created using the standard constructors. Otherwise, it uses
117 * "currentToken" and "expectedTokenSequences" to generate a parse
118 * error message and returns it. If this object has been created
119 * due to a parse error, and you do not catch it (it gets thrown
120 * from the parser), then this method is called during the printing
121 * of the final stack trace, and hence the correct error message
122 * gets displayed.
123 */
124 public String getMessage()
125 {
126 if (!specialConstructor)
127 {
128 return super.getMessage();
129 }
130 String expected = "";
131 int maxSize = 0;
132 for (int i = 0; i < expectedTokenSequences.length; i++)
133 {
134 if (maxSize < expectedTokenSequences[i].length)
135 {
136 maxSize = expectedTokenSequences[i].length;
137 }
138 for (int j = 0; j < expectedTokenSequences[i].length; j++)
139 {
140 expected += tokenImage[expectedTokenSequences[i][j]] + " ";
141 }
142 if (expectedTokenSequences[i][expectedTokenSequences[i].length - 1] != 0)
143 {
144 expected += "...";
145 }
146 expected += eol + " ";
147 }
148 String retval = "Encountered \"";
149 Token tok = currentToken.next;
150 for (int i = 0; i < maxSize; i++)
151 {
152 if (i != 0)
153 retval += " ";
154 if (tok.kind == 0)
155 {
156 retval += tokenImage[0];
157 break;
158 }
159 retval += add_escapes(tok.image);
160 tok = tok.next;
161 }
162 retval += "\" at line " + currentToken.next.beginLine + ", column "
163 + currentToken.next.beginColumn + "." + eol;
164 if (expectedTokenSequences.length == 1)
165 {
166 retval += "Was expecting:" + eol + " ";
167 }
168 else
169 {
170 retval += "Was expecting one of:" + eol + " ";
171 }
172 retval += expected;
173 return retval;
174 }
175
176 /**
177 * The end of line string for this machine.
178 */
179 protected String eol = System.getProperty("line.separator", "\n");
180
181 /**
182 * Used to convert raw characters to their escaped version
183 * when these raw version cannot be used as part of an ASCII
184 * string literal.
185 */
186 protected String add_escapes(String str)
187 {
188 StringBuffer retval = new StringBuffer();
189 char ch;
190 for (int i = 0; i < str.length(); i++)
191 {
192 switch (str.charAt(i))
193 {
194 case 0:
195 continue;
196 case '\b':
197 retval.append("\\b");
198 continue;
199 case '\t':
200 retval.append("\\t");
201 continue;
202 case '\n':
203 retval.append("\\n");
204 continue;
205 case '\f':
206 retval.append("\\f");
207 continue;
208 case '\r':
209 retval.append("\\r");
210 continue;
211 case '\"':
212 retval.append("\\\"");
213 continue;
214 case '\'':
215 retval.append("\\\'");
216 continue;
217 case '\\':
218 retval.append("\\\\");
219 continue;
220 default:
221 if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e)
222 {
223 String s = "0000" + Integer.toString(ch, 16);
224 retval.append("\\u" + s.substring(s.length() - 4, s.length()));
225 }
226 else
227 {
228 retval.append(ch);
229 }
230 continue;
231 }
232 }
233 return retval.toString();
234 }
235
236 }