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    }