ParseException


1   /* Generated By:JavaCC: Do not edit this line. ParseException.java Version 3.0 */
2   /** 
3    * JSP Parser for PMD.
4    * @author Pieter � Application Engineers NV/SA � http://www.ae.be
5    */
6   
7   package net.sourceforge.pmd.jsp.ast;
8   
9   /**
10   * This exception is thrown when parse errors are encountered.
11   * You can explicitly create objects of this exception type by
12   * calling the method generateParseException in the generated
13   * parser.
14   * <p/>
15   * You can modify this class to customize your error reporting
16   * mechanisms so long as you retain the public fields.
17   */
18  public class ParseException extends net.sourceforge.pmd.ast.ParseException {
19  
20      /**
21       * This constructor is used by the method "generateParseException"
22       * in the generated parser.  Calling this constructor generates
23       * a new object of this type with the fields "currentToken",
24       * "expectedTokenSequences", and "tokenImage" set.  The boolean
25       * flag "specialConstructor" is also set to true to indicate that
26       * this constructor was used to create this object.
27       * This constructor calls its super class with the empty string
28       * to force the "toString" method of parent class "Throwable" to
29       * print the error message in the form:
30       * ParseException: <result of getMessage>
31       */
32      public ParseException(Token currentTokenVal,
33                            int[][] expectedTokenSequencesVal,
34                            String  [] tokenImageVal) {
35          super("");
36          specialConstructor = true;
37          currentToken = currentTokenVal;
38          expectedTokenSequences = expectedTokenSequencesVal;
39          tokenImage = tokenImageVal;
40      }
41  
42      /**
43       * The following constructors are for use by you for whatever
44       * purpose you can think of.  Constructing the exception in this
45       * manner makes the exception behave in the normal way - i.e., as
46       * documented in the class "Throwable".  The fields "errorToken",
47       * "expectedTokenSequences", and "tokenImage" do not contain
48       * relevant information.  The JavaCC generated code does not use
49       * these constructors.
50       */
51  
52      public ParseException() {
53          super();
54          specialConstructor = false;
55      }
56  
57      public ParseException(String   message) {
58          super(message);
59          specialConstructor = false;
60      }
61  
62      /**
63       * This variable determines which constructor was used to create
64       * this object and thereby affects the semantics of the
65       * "getMessage" method (see below).
66       */
67      protected boolean specialConstructor;
68  
69      /**
70       * This is the last token that has been consumed successfully.  If
71       * this object has been created due to a parse error, the token
72       * followng this token will (therefore) be the first error token.
73       */
74      public Token currentToken;
75  
76      /**
77       * Each entry in this array is an array of integers.  Each array
78       * of integers represents a sequence of tokens (by their ordinal
79       * values) that is expected at this point of the parse.
80       */
81      public int[][] expectedTokenSequences;
82  
83      /**
84       * This is a reference to the "tokenImage" array of the generated
85       * parser within which the parse error occurred.  This array is
86       * defined in the generated ...Constants interface.
87       */
88      public String  [] tokenImage;
89  
90      /**
91       * This method has the standard behavior when this object has been
92       * created using the standard constructors.  Otherwise, it uses
93       * "currentToken" and "expectedTokenSequences" to generate a parse
94       * error message and returns it.  If this object has been created
95       * due to a parse error, and you do not catch it (it gets thrown
96       * from the parser), then this method is called during the printing
97       * of the final stack trace, and hence the correct error message
98       * gets displayed.
99       */
100     public String   getMessage() {
101         if (!specialConstructor) {
102             return super.getMessage();
103         }
104         String   expected = "";
105         int maxSize = 0;
106         for (int i = 0; i < expectedTokenSequences.length; i++) {
107             if (maxSize < expectedTokenSequences[i].length) {
108                 maxSize = expectedTokenSequences[i].length;
109             }
110             for (int j = 0; j < expectedTokenSequences[i].length; j++) {
111                 expected += tokenImage[expectedTokenSequences[i][j]] + " ";
112             }
113             if (expectedTokenSequences[i][expectedTokenSequences[i].length - 1] != 0) {
114                 expected += "...";
115             }
116             expected += eol + "    ";
117         }
118         String   retval = "Encountered \"";
119         Token tok = currentToken.next;
120         for (int i = 0; i < maxSize; i++) {
121             if (i != 0) retval += " ";
122             if (tok.kind == 0) {
123                 retval += tokenImage[0];
124                 break;
125             }
126             retval += add_escapes(tok.image);
127             tok = tok.next;
128         }
129         retval += "\" at line " + currentToken.next.beginLine + ", column " + currentToken.next.beginColumn;
130         retval += "." + eol;
131         if (expectedTokenSequences.length == 1) {
132             retval += "Was expecting:" + eol + "    ";
133         } else {
134             retval += "Was expecting one of:" + eol + "    ";
135         }
136         retval += expected;
137         return retval;
138     }
139 
140     /**
141      * The end of line string for this machine.
142      */
143     protected String   eol = System.getProperty("line.separator", "\n");
144 
145     /**
146      * Used to convert raw characters to their escaped version
147      * when these raw version cannot be used as part of an ASCII
148      * string literal.
149      */
150     protected String   add_escapes(String   str) {
151         StringBuffer   retval = new StringBuffer  ();
152         char ch;
153         for (int i = 0; i < str.length(); i++) {
154             switch (str.charAt(i)) {
155                 case 0:
156                     continue;
157                 case '\b':
158                     retval.append("\\b");
159                     continue;
160                 case '\t':
161                     retval.append("\\t");
162                     continue;
163                 case '\n':
164                     retval.append("\\n");
165                     continue;
166                 case '\f':
167                     retval.append("\\f");
168                     continue;
169                 case '\r':
170                     retval.append("\\r");
171                     continue;
172                 case '\"':
173                     retval.append("\\\"");
174                     continue;
175                 case '\'':
176                     retval.append("\\\'");
177                     continue;
178                 case '\\':
179                     retval.append("\\\\");
180                     continue;
181                 default:
182                     if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) {
183                         String   s = "0000" + Integer.toString(ch, 16);
184                         retval.append("\\u" + s.substring(s.length() - 4, s.length()));
185                     } else {
186                         retval.append(ch);
187                     }
188                     continue;
189             }
190         }
191         return retval.toString();
192     }
193 
194 }
195
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