001 /* Generated By:JavaCC: Do not edit this line. ParseException.java Version 3.0 */
002 /**
003 * Licensed to the Apache Software Foundation (ASF) under one
004 * or more contributor license agreements. See the NOTICE file
005 * distributed with this work for additional information
006 * regarding copyright ownership. The ASF licenses this file
007 * to you under the Apache License, Version 2.0 (the
008 * "License"); you may not use this file except in compliance
009 * with 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.apache.hadoop.record.compiler.generated;
021
022 import org.apache.hadoop.classification.InterfaceAudience;
023 import org.apache.hadoop.classification.InterfaceStability;
024
025 /**
026 * This exception is thrown when parse errors are encountered.
027 * You can explicitly create objects of this exception type by
028 * calling the method generateParseException in the generated
029 * parser.
030 *
031 * You can modify this class to customize your error reporting
032 * mechanisms so long as you retain the public fields.
033 *
034 * @deprecated Replaced by <a href="http://hadoop.apache.org/avro/">Avro</a>.
035 */
036 @Deprecated
037 @InterfaceAudience.Public
038 @InterfaceStability.Stable
039 public class ParseException extends Exception {
040
041 /**
042 * This constructor is used by the method "generateParseException"
043 * in the generated parser. Calling this constructor generates
044 * a new object of this type with the fields "currentToken",
045 * "expectedTokenSequences", and "tokenImage" set. The boolean
046 * flag "specialConstructor" is also set to true to indicate that
047 * this constructor was used to create this object.
048 * This constructor calls its super class with the empty string
049 * to force the "toString" method of parent class "Throwable" to
050 * print the error message in the form:
051 * ParseException: <result of getMessage>
052 */
053 public ParseException(Token currentTokenVal,
054 int[][] expectedTokenSequencesVal,
055 String[] tokenImageVal
056 )
057 {
058 super("");
059 specialConstructor = true;
060 currentToken = currentTokenVal;
061 expectedTokenSequences = expectedTokenSequencesVal;
062 tokenImage = tokenImageVal;
063 }
064
065 /**
066 * The following constructors are for use by you for whatever
067 * purpose you can think of. Constructing the exception in this
068 * manner makes the exception behave in the normal way - i.e., as
069 * documented in the class "Throwable". The fields "errorToken",
070 * "expectedTokenSequences", and "tokenImage" do not contain
071 * relevant information. The JavaCC generated code does not use
072 * these constructors.
073 */
074
075 public ParseException() {
076 super();
077 specialConstructor = false;
078 }
079
080 public ParseException(String message) {
081 super(message);
082 specialConstructor = false;
083 }
084
085 /**
086 * This variable determines which constructor was used to create
087 * this object and thereby affects the semantics of the
088 * "getMessage" method (see below).
089 */
090 protected boolean specialConstructor;
091
092 /**
093 * This is the last token that has been consumed successfully. If
094 * this object has been created due to a parse error, the token
095 * followng this token will (therefore) be the first error token.
096 */
097 public Token currentToken;
098
099 /**
100 * Each entry in this array is an array of integers. Each array
101 * of integers represents a sequence of tokens (by their ordinal
102 * values) that is expected at this point of the parse.
103 */
104 public int[][] expectedTokenSequences;
105
106 /**
107 * This is a reference to the "tokenImage" array of the generated
108 * parser within which the parse error occurred. This array is
109 * defined in the generated ...Constants interface.
110 */
111 public String[] tokenImage;
112
113 /**
114 * This method has the standard behavior when this object has been
115 * created using the standard constructors. Otherwise, it uses
116 * "currentToken" and "expectedTokenSequences" to generate a parse
117 * error message and returns it. If this object has been created
118 * due to a parse error, and you do not catch it (it gets thrown
119 * from the parser), then this method is called during the printing
120 * of the final stack trace, and hence the correct error message
121 * gets displayed.
122 */
123 public String getMessage() {
124 if (!specialConstructor) {
125 return super.getMessage();
126 }
127 StringBuffer expected = new StringBuffer();
128 int maxSize = 0;
129 for (int i = 0; i < expectedTokenSequences.length; i++) {
130 if (maxSize < expectedTokenSequences[i].length) {
131 maxSize = expectedTokenSequences[i].length;
132 }
133 for (int j = 0; j < expectedTokenSequences[i].length; j++) {
134 expected.append(tokenImage[expectedTokenSequences[i][j]]).append(" ");
135 }
136 if (expectedTokenSequences[i][expectedTokenSequences[i].length - 1] != 0) {
137 expected.append("...");
138 }
139 expected.append(eol).append(" ");
140 }
141 String retval = "Encountered \"";
142 Token tok = currentToken.next;
143 for (int i = 0; i < maxSize; i++) {
144 if (i != 0) retval += " ";
145 if (tok.kind == 0) {
146 retval += tokenImage[0];
147 break;
148 }
149 retval += add_escapes(tok.image);
150 tok = tok.next;
151 }
152 retval += "\" at line " + currentToken.next.beginLine + ", column " + currentToken.next.beginColumn;
153 retval += "." + eol;
154 if (expectedTokenSequences.length == 1) {
155 retval += "Was expecting:" + eol + " ";
156 } else {
157 retval += "Was expecting one of:" + eol + " ";
158 }
159 retval += expected.toString();
160 return retval;
161 }
162
163 /**
164 * The end of line string for this machine.
165 */
166 protected String eol = System.getProperty("line.separator", "\n");
167
168 /**
169 * Used to convert raw characters to their escaped version
170 * when these raw version cannot be used as part of an ASCII
171 * string literal.
172 */
173 protected String add_escapes(String str) {
174 StringBuffer retval = new StringBuffer();
175 char ch;
176 for (int i = 0; i < str.length(); i++) {
177 switch (str.charAt(i))
178 {
179 case 0 :
180 continue;
181 case '\b':
182 retval.append("\\b");
183 continue;
184 case '\t':
185 retval.append("\\t");
186 continue;
187 case '\n':
188 retval.append("\\n");
189 continue;
190 case '\f':
191 retval.append("\\f");
192 continue;
193 case '\r':
194 retval.append("\\r");
195 continue;
196 case '\"':
197 retval.append("\\\"");
198 continue;
199 case '\'':
200 retval.append("\\\'");
201 continue;
202 case '\\':
203 retval.append("\\\\");
204 continue;
205 default:
206 if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) {
207 String s = "0000" + Integer.toString(ch, 16);
208 retval.append("\\u" + s.substring(s.length() - 4, s.length()));
209 } else {
210 retval.append(ch);
211 }
212 continue;
213 }
214 }
215 return retval.toString();
216 }
217
218 }