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Java > Open Source Codes > org > codehaus > aspectwerkz > expression > ast > TokenMgrError


1 /* Generated By:JavaCC: Do not edit this line. TokenMgrError.java Version 3.0 */
2 /***********************************************************************************************************************
3  * Copyright (c) Jonas BonŽr, Alexandre Vasseur. All rights reserved. * http://aspectwerkz.codehaus.org *
4  * ---------------------------------------------------------------------------------- * The software in this package is
5  * published under the terms of the LGPL license * a copy of which has been included with this distribution in the
6  * license.txt file. *
7  **********************************************************************************************************************/
8 package org.codehaus.aspectwerkz.expression.ast;
9
10 public class TokenMgrError extends Error JavaDoc {
11     /*
12      * Ordinals for various reasons why an Error of this type can be thrown.
13      */
14
15     /**
16      * Lexical error occured.
17      */
18     static final int LEXICAL_ERROR = 0;
19
20     /**
21      * An attempt wass made to create a second instance of a static token manager.
22      */
23     static final int STATIC_LEXER_ERROR = 1;
24
25     /**
26      * Tried to change to an invalid lexical state.
27      */
28     static final int INVALID_LEXICAL_STATE = 2;
29
30     /**
31      * Detected (and bailed out of) an infinite loop in the token manager.
32      */
33     static final int LOOP_DETECTED = 3;
34
35     /**
36      * Indicates the reason why the exception is thrown. It will have one of the above 4 values.
37      */
38     int errorCode;
39
40     /**
41      * Replaces unprintable characters by their espaced (or unicode escaped) equivalents in the given string
42      */
43     protected static final String JavaDoc addEscapes(String JavaDoc str) {
44         StringBuffer JavaDoc retval = new StringBuffer JavaDoc();
45         char ch;
46         for (int i = 0; i < str.length(); i++) {
47             switch (str.charAt(i)) {
48                 case 0:
49                     continue;
50                 case '\b':
51                     retval.append("\\b");
52                     continue;
53                 case '\t':
54                     retval.append("\\t");
55                     continue;
56                 case '\n':
57                     retval.append("\\n");
58                     continue;
59                 case '\f':
60                     retval.append("\\f");
61                     continue;
62                 case '\r':
63                     retval.append("\\r");
64                     continue;
65                 case '\"':
66                     retval.append("\\\"");
67                     continue;
68                 case '\'':
69                     retval.append("\\\'");
70                     continue;
71                 case '\\':
72                     retval.append("\\\\");
73                     continue;
74                 default:
75                     if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) {
76                         String JavaDoc s = "0000" + Integer.toString(ch, 16);
77                         retval.append("\\u" + s.substring(s.length() - 4, s.length()));
78                     } else {
79                         retval.append(ch);
80                     }
81                     continue;
82             }
83         }
84         return retval.toString();
85     }
86
87     /**
88      * Returns a detailed message for the Error when it is thrown by the token manager to indicate a lexical error.
89      * Parameters : EOFSeen : indicates if EOF caused the lexicl error curLexState : lexical state in which this error
90      * occured errorLine : line number when the error occured errorColumn : column number when the error occured
91      * errorAfter : prefix that was seen before this error occured curchar : the offending character Note: You can
92      * customize the lexical error message by modifying this method.
93      */
94     protected static String JavaDoc LexicalError(boolean EOFSeen,
95                                          int lexState,
96                                          int errorLine,
97                                          int errorColumn,
98                                          String JavaDoc errorAfter,
99                                          char curChar) {
100         return ("Lexical error at line "
101                 + errorLine
102                 + ", column "
103                 + errorColumn
104                 + ". Encountered: "
105                 +
106                 (EOFSeen ?
107                  "<EOF> " : ("\"" + addEscapes(String.valueOf(curChar)) + "\"") + " (" + (int) curChar + "), ")
108                 + "after : \""
109                 + addEscapes(errorAfter) + "\"");
110     }
111
112     /**
113      * You can also modify the body of this method to customize your error messages. For example, cases like
114      * LOOP_DETECTED and INVALID_LEXICAL_STATE are not of end-users concern, so you can return something like :
115      * "Internal Error : Please file a bug report .... " from this method for such cases in the release version of your
116      * parser.
117      */
118     public String JavaDoc getMessage() {
119         return super.getMessage();
120     }
121
122     /*
123      * Constructors of various flavors follow.
124      */
125
126     public TokenMgrError() {
127     }
128
129     public TokenMgrError(String JavaDoc message, int reason) {
130         super(message);
131         errorCode = reason;
132     }
133
134     public TokenMgrError(boolean EOFSeen,
135                          int lexState,
136                          int errorLine,
137                          int errorColumn,
138                          String JavaDoc errorAfter,
139                          char curChar,
140                          int reason) {
141         this(LexicalError(EOFSeen, lexState, errorLine, errorColumn, errorAfter, curChar), reason);
142     }
143 }
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