001 /* Generated By:JavaCC: Do not edit this line. TokenMgrError.java Version 3.0 */
002 /**
003 * Licensed to the Apache Software Foundation (ASF) under one or more
004 * contributor license agreements. See the NOTICE file distributed with
005 * this work for additional information regarding copyright ownership.
006 * The ASF licenses this file to You under the Apache License, Version 2.0
007 * (the "License"); you may not use this file except in compliance with
008 * the License. You may obtain a copy of the License at
009 *
010 * http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018 package org.fusesource.hawtbuf.proto.compiler.parser;
019
020 public class TokenMgrError extends Error
021 {
022 /*
023 * Ordinals for various reasons why an Error of this type can be thrown.
024 */
025
026 /**
027 * Lexical error occured.
028 */
029 static final int LEXICAL_ERROR = 0;
030
031 /**
032 * An attempt wass made to create a second instance of a static token manager.
033 */
034 static final int STATIC_LEXER_ERROR = 1;
035
036 /**
037 * Tried to change to an invalid lexical state.
038 */
039 static final int INVALID_LEXICAL_STATE = 2;
040
041 /**
042 * Detected (and bailed out of) an infinite loop in the token manager.
043 */
044 static final int LOOP_DETECTED = 3;
045
046 /**
047 * Indicates the reason why the exception is thrown. It will have
048 * one of the above 4 values.
049 */
050 int errorCode;
051
052 /**
053 * Replaces unprintable characters by their espaced (or unicode escaped)
054 * equivalents in the given string
055 */
056 protected static final String addEscapes(String str) {
057 StringBuffer retval = new StringBuffer();
058 char ch;
059 for (int i = 0; i < str.length(); i++) {
060 switch (str.charAt(i))
061 {
062 case 0 :
063 continue;
064 case '\b':
065 retval.append("\\b");
066 continue;
067 case '\t':
068 retval.append("\\t");
069 continue;
070 case '\n':
071 retval.append("\\n");
072 continue;
073 case '\f':
074 retval.append("\\f");
075 continue;
076 case '\r':
077 retval.append("\\r");
078 continue;
079 case '\"':
080 retval.append("\\\"");
081 continue;
082 case '\'':
083 retval.append("\\\'");
084 continue;
085 case '\\':
086 retval.append("\\\\");
087 continue;
088 default:
089 if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) {
090 String s = "0000" + Integer.toString(ch, 16);
091 retval.append("\\u" + s.substring(s.length() - 4, s.length()));
092 } else {
093 retval.append(ch);
094 }
095 continue;
096 }
097 }
098 return retval.toString();
099 }
100
101 /**
102 * Returns a detailed message for the Error when it is thrown by the
103 * token manager to indicate a lexical error.
104 * Parameters :
105 * EOFSeen : indicates if EOF caused the lexicl error
106 * curLexState : lexical state in which this error occured
107 * errorLine : line number when the error occured
108 * errorColumn : column number when the error occured
109 * errorAfter : prefix that was seen before this error occured
110 * curchar : the offending character
111 * Note: You can customize the lexical error message by modifying this method.
112 */
113 protected static String LexicalError(boolean EOFSeen, int lexState, int errorLine, int errorColumn, String errorAfter, char curChar) {
114 return("Lexical error at line " +
115 errorLine + ", column " +
116 errorColumn + ". Encountered: " +
117 (EOFSeen ? "<EOF> " : ("\"" + addEscapes(String.valueOf(curChar)) + "\"") + " (" + (int)curChar + "), ") +
118 "after : \"" + addEscapes(errorAfter) + "\"");
119 }
120
121 /**
122 * You can also modify the body of this method to customize your error messages.
123 * For example, cases like LOOP_DETECTED and INVALID_LEXICAL_STATE are not
124 * of end-users concern, so you can return something like :
125 *
126 * "Internal Error : Please file a bug report .... "
127 *
128 * from this method for such cases in the release version of your parser.
129 */
130 public String getMessage() {
131 return super.getMessage();
132 }
133
134 /*
135 * Constructors of various flavors follow.
136 */
137
138 public TokenMgrError() {
139 }
140
141 public TokenMgrError(String message, int reason) {
142 super(message);
143 errorCode = reason;
144 }
145
146 public TokenMgrError(boolean EOFSeen, int lexState, int errorLine, int errorColumn, String errorAfter, char curChar, int reason) {
147 this(LexicalError(EOFSeen, lexState, errorLine, errorColumn, errorAfter, curChar), reason);
148 }
149 }