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