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
020 package 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 */
031 public 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 }