ParseException


1   /*
2    * @(#)ParseException.java  4.11 04/07/26
3    * 
4    * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
5    * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
6    */
7   
8   /* Generated By:JavaCC: Do not edit this line. ParseException.java Version 0.7pre6 */
9   package com.sun.jmx.snmp.IPAcl;
10  
11  /**
12   * This exception is thrown when parse errors are encountered.
13   * You can explicitly create objects of this exception type by
14   * calling the method generateParseException in the generated
15   * parser.
16   *
17   * You can modify this class to customize your error reporting
18   * mechanisms so long as you retain the public fields.
19   */
20  class ParseException extends Exception   {
21  
22    /**
23     * This constructor is used by the method "generateParseException"
24     * in the generated parser.  Calling this constructor generates
25     * a new object of this type with the fields "currentToken",
26     * "expectedTokenSequences", and "tokenImage" set.  The boolean
27     * flag "specialConstructor" is also set to true to indicate that
28     * this constructor was used to create this object.
29     * This constructor calls its super class with the empty string
30     * to force the "toString" method of parent class "Throwable" to
31     * print the error message in the form:
32     *     ParseException: <result of getMessage>
33     */
34    public ParseException(Token currentTokenVal,
35                          int[][] expectedTokenSequencesVal,
36                          String  [] tokenImageVal
37                         )
38    {
39      super("");
40      specialConstructor = true;
41      currentToken = currentTokenVal;
42      expectedTokenSequences = expectedTokenSequencesVal;
43      tokenImage = tokenImageVal;
44    }
45  
46    /**
47     * The following constructors are for use by you for whatever
48     * purpose you can think of.  Constructing the exception in this
49     * manner makes the exception behave in the normal way - i.e., as
50     * documented in the class "Throwable".  The fields "errorToken",
51     * "expectedTokenSequences", and "tokenImage" do not contain
52     * relevant information.  The JavaCC generated code does not use
53     * these constructors.
54     */
55  
56    public ParseException() {
57      super();
58      specialConstructor = false;
59    }
60  
61    public ParseException(String   message) {
62      super(message);
63      specialConstructor = false;
64    }
65  
66    /**
67     * This variable determines which constructor was used to create
68     * this object and thereby affects the semantics of the
69     * "getMessage" method (see below).
70     */
71    protected boolean specialConstructor;
72  
73    /**
74     * This is the last token that has been consumed successfully.  If
75     * this object has been created due to a parse error, the token
76     * followng this token will (therefore) be the first error token.
77     */
78    public Token currentToken;
79  
80    /**
81     * Each entry in this array is an array of integers.  Each array
82     * of integers represents a sequence of tokens (by their ordinal
83     * values) that is expected at this point of the parse.
84     */
85    public int[][] expectedTokenSequences;
86  
87    /**
88     * This is a reference to the "tokenImage" array of the generated
89     * parser within which the parse error occurred.  This array is
90     * defined in the generated ...Constants interface.
91     */
92    public String  [] tokenImage;
93  
94    /**
95     * This method has the standard behavior when this object has been
96     * created using the standard constructors.  Otherwise, it uses
97     * "currentToken" and "expectedTokenSequences" to generate a parse
98     * error message and returns it.  If this object has been created
99     * due to a parse error, and you do not catch it (it gets thrown
100    * from the parser), then this method is called during the printing
101    * of the final stack trace, and hence the correct error message
102    * gets displayed.
103    */
104   public String   getMessage() {
105     if (!specialConstructor) {
106       return super.getMessage();
107     }
108     String   expected = "";
109     int maxSize = 0;
110     for (int i = 0; i < expectedTokenSequences.length; i++) {
111       if (maxSize < expectedTokenSequences[i].length) {
112         maxSize = expectedTokenSequences[i].length;
113       }
114       for (int j = 0; j < expectedTokenSequences[i].length; j++) {
115         expected += tokenImage[expectedTokenSequences[i][j]] + " ";
116       }
117       if (expectedTokenSequences[i][expectedTokenSequences[i].length - 1] != 0) {
118         expected += "...";
119       }
120       expected += eol + "    ";
121     }
122     String   retval = "Encountered \"";
123     Token tok = currentToken.next;
124     for (int i = 0; i < maxSize; i++) {
125       if (i != 0) retval += " ";
126       if (tok.kind == 0) {
127         retval += tokenImage[0];
128         break;
129       }
130       retval += add_escapes(tok.image);
131       tok = tok.next; 
132     }
133     retval += "\" at line " + currentToken.next.beginLine + ", column " + currentToken.next.beginColumn + "." + eol;
134     if (expectedTokenSequences.length == 1) {
135       retval += "Was expecting:" + eol + "    ";
136     } else {
137       retval += "Was expecting one of:" + eol + "    ";
138     }
139     retval += expected;
140     return retval;
141   }
142 
143   /**
144    * The end of line string for this machine.
145    */
146   protected String   eol = System.getProperty("line.separator", "\n");
147  
148   /**
149    * Used to convert raw characters to their escaped version
150    * when these raw version cannot be used as part of an ASCII
151    * string literal.
152    */
153   protected String   add_escapes(String   str) {
154       StringBuffer   retval = new StringBuffer  ();
155       char ch;
156       for (int i = 0; i < str.length(); i++) {
157         switch (str.charAt(i))
158         {
159            case 0 :
160               continue;
161            case '\b':
162               retval.append("\\b");
163               continue;
164            case '\t':
165               retval.append("\\t");
166               continue;
167            case '\n':
168               retval.append("\\n");
169               continue;
170            case '\f':
171               retval.append("\\f");
172               continue;
173            case '\r':
174               retval.append("\\r");
175               continue;
176            case '\"':
177               retval.append("\\\"");
178               continue;
179            case '\'':
180               retval.append("\\\'");
181               continue;
182            case '\\':
183               retval.append("\\\\");
184               continue;
185            default:
186               if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) {
187                  String   s = "0000" + Integer.toString(ch, 16);
188                  retval.append("\\u" + s.substring(s.length() - 4, s.length()));
189               } else {
190                  retval.append(ch);
191               }
192               continue;
193         }
194       }
195       return retval.toString();
196    }
197 
198 }
199
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