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Java > Open Source Codes > org > objectweb > speedo > query > parser > ParseException


1 /* Generated By:JavaCC: Do not edit this line. ParseException.java Version 2.1 */
2 package org.objectweb.speedo.query.parser;
3
4 import org.objectweb.speedo.query.parser.Token;
5
6 /**
7  * This exception is thrown when parse errors are encountered.
8  * You can explicitly create objects of this exception type by
9  * calling the method generateParseException in the generated
10  * parser.
11  *
12  * You can modify this class to customize your error reporting
13  * mechanisms so long as you retain the public fields.
14  */
15 public class ParseException extends Exception JavaDoc {
16
17     /**
18      * This constructor is used by the method "generateParseException"
19      * in the generated parser. Calling this constructor generates
20      * a new object of this type with the fields "currentToken",
21      * "expectedTokenSequences", and "tokenImage" set. The boolean
22      * flag "specialConstructor" is also set to true to indicate that
23      * this constructor was used to create this object.
24      * This constructor calls its super class with the empty string
25      * to force the "toString" method of parent class "Throwable" to
26      * print the error message in the form:
27      * ParseException: <result of getMessage>
28      */
29     public ParseException(Token currentTokenVal,
30                           int[][] expectedTokenSequencesVal,
31                           String JavaDoc[] tokenImageVal
32                           ) {
33         super("");
34         specialConstructor = true;
35         currentToken = currentTokenVal;
36         expectedTokenSequences = expectedTokenSequencesVal;
37         tokenImage = tokenImageVal;
38     }
39
40     /**
41      * The following constructors are for use by you for whatever
42      * purpose you can think of. Constructing the exception in this
43      * manner makes the exception behave in the normal way - i.e., as
44      * documented in the class "Throwable". The fields "errorToken",
45      * "expectedTokenSequences", and "tokenImage" do not contain
46      * relevant information. The JavaCC generated code does not use
47      * these constructors.
48      */
49
50     public ParseException() {
51         super();
52         specialConstructor = false;
53     }
54
55     public ParseException(String JavaDoc message) {
56         super(message);
57         specialConstructor = false;
58     }
59
60     /**
61      * This variable determines which constructor was used to create
62      * this object and thereby affects the semantics of the
63      * "getMessage" method (see below).
64      */
65     protected boolean specialConstructor;
66
67     /**
68      * This is the last token that has been consumed successfully. If
69      * this object has been created due to a parse error, the token
70      * followng this token will (therefore) be the first error token.
71      */
72     public Token currentToken;
73
74     /**
75      * Each entry in this array is an array of integers. Each array
76      * of integers represents a sequence of tokens (by their ordinal
77      * values) that is expected at this point of the parse.
78      */
79     public int[][] expectedTokenSequences;
80
81     /**
82      * This is a reference to the "tokenImage" array of the generated
83      * parser within which the parse error occurred. This array is
84      * defined in the generated ...Constants interface.
85      */
86     public String JavaDoc[] tokenImage;
87
88     /**
89      * This method has the standard behavior when this object has been
90      * created using the standard constructors. Otherwise, it uses
91      * "currentToken" and "expectedTokenSequences" to generate a parse
92      * error message and returns it. If this object has been created
93      * due to a parse error, and you do not catch it (it gets thrown
94      * from the parser), then this method is called during the printing
95      * of the final stack trace, and hence the correct error message
96      * gets displayed.
97      */
98     public String JavaDoc getMessage() {
99         if (!specialConstructor) {
100             return super.getMessage();
101         }
102         String JavaDoc expected = "";
103         int maxSize = 0;
104         for (int i = 0; i < expectedTokenSequences.length; i++) {
105             if (maxSize < expectedTokenSequences[i].length) {
106                 maxSize = expectedTokenSequences[i].length;
107             }
108             for (int j = 0; j < expectedTokenSequences[i].length; j++) {
109                 expected += tokenImage[expectedTokenSequences[i][j]] + " ";
110             }
111             if (expectedTokenSequences[i][expectedTokenSequences[i].length - 1] != 0) {
112                 expected += "...";
113             }
114             expected += eol + " ";
115         }
116         String JavaDoc retval = "Encountered \"";
117         Token tok = currentToken.next;
118         for (int i = 0; i < maxSize; i++) {
119             if (i != 0) retval += " ";
120             if (tok.kind == 0) {
121                 retval += tokenImage[0];
122                 break;
123             }
124             retval += add_escapes(tok.image);
125             tok = tok.next;
126         }
127         retval += "\" at line " + currentToken.next.beginLine + ", column " + currentToken.next.beginColumn;
128         retval += "." + eol;
129         if (expectedTokenSequences.length == 1) {
130             retval += "Was expecting:" + eol + " ";
131         } else {
132             retval += "Was expecting one of:" + eol + " ";
133         }
134         retval += expected;
135         return retval;
136     }
137
138     /**
139      * The end of line string for this machine.
140      */
141     protected String JavaDoc eol = System.getProperty("line.separator", "\n");
142
143     /**
144      * Used to convert raw characters to their escaped version
145      * when these raw version cannot be used as part of an ASCII
146      * string literal.
147      */
148     protected String JavaDoc add_escapes(String JavaDoc str) {
149         StringBuffer JavaDoc retval = new StringBuffer JavaDoc();
150         char ch;
151         for (int i = 0; i < str.length(); i++) {
152             switch (str.charAt(i)) {
153             case 0:
154                 continue;
155             case '\b':
156                 retval.append("\\b");
157                 continue;
158             case '\t':
159                 retval.append("\\t");
160                 continue;
161             case '\n':
162                 retval.append("\\n");
163                 continue;
164             case '\f':
165                 retval.append("\\f");
166                 continue;
167             case '\r':
168                 retval.append("\\r");
169                 continue;
170             case '\"':
171                 retval.append("\\\"");
172                 continue;
173             case '\'':
174                 retval.append("\\\'");
175                 continue;
176             case '\\':
177                 retval.append("\\\\");
178                 continue;
179             default:
180                 if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) {
181                     String JavaDoc s = "0000" + Integer.toString(ch, 16);
182                     retval.append("\\u" + s.substring(s.length() - 4, s.length()));
183                 } else {
184                     retval.append(ch);
185                 }
186                 continue;
187             }
188         }
189         return retval.toString();
190     }
191
192 }
193
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