1 /* Generated By:JavaCC: Do not edit this line. ParseException.java Version 3.0 */
2 package com.quiotix.html.parser;
3
4 /**
5 * This exception is thrown when parse errors are encountered.
6 * You can explicitly create objects of this exception type by
7 * calling the method generateParseException in the generated
8 * parser.
9 *
10 * You can modify this class to customize your error reporting
11 * mechanisms so long as you retain the public fields.
12 */
13 public class ParseException extends Exception {
14
15 /**
16 * This constructor is used by the method "generateParseException"
17 * in the generated parser. Calling this constructor generates
18 * a new object of this type with the fields "currentToken",
19 * "expectedTokenSequences", and "tokenImage" set. The boolean
20 * flag "specialConstructor" is also set to true to indicate that
21 * this constructor was used to create this object.
22 * This constructor calls its super class with the empty string
23 * to force the "toString" method of parent class "Throwable" to
24 * print the error message in the form:
25 * ParseException: <result of getMessage>
26 */
27 public ParseException(Token currentTokenVal,
28 int[][] expectedTokenSequencesVal,
29 String[] tokenImageVal
30 )
31 {
32 super("");
33 specialConstructor = true;
34 currentToken = currentTokenVal;
35 expectedTokenSequences = expectedTokenSequencesVal;
36 tokenImage = tokenImageVal;
37 }
38
39 /**
40 * The following constructors are for use by you for whatever
41 * purpose you can think of. Constructing the exception in this
42 * manner makes the exception behave in the normal way - i.e., as
43 * documented in the class "Throwable". The fields "errorToken",
44 * "expectedTokenSequences", and "tokenImage" do not contain
45 * relevant information. The JavaCC generated code does not use
46 * these constructors.
47 */
48
49 public ParseException() {
50 super();
51 specialConstructor = false;
52 }
53
54 /** Constructor with message. */
55 public ParseException(String 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[] 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 getMessage() {
99 if (!specialConstructor) {
100 return super.getMessage();
101 }
102 StringBuffer expected = new StringBuffer();
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.append(tokenImage[expectedTokenSequences[i][j]]).append(' ');
110 }
111 if (expectedTokenSequences[i][expectedTokenSequences[i].length - 1] != 0) {
112 expected.append("...");
113 }
114 expected.append(eol).append(" ");
115 }
116 String 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 += " " + tokenImage[tok.kind];
125 retval += " \"";
126 retval += add_escapes(tok.image);
127 retval += " \"";
128 tok = tok.next;
129 }
130 retval += "\" at line " + currentToken.next.beginLine + ", column " + currentToken.next.beginColumn;
131 retval += "." + eol;
132 if (expectedTokenSequences.length == 1) {
133 retval += "Was expecting:" + eol + " ";
134 } else {
135 retval += "Was expecting one of:" + eol + " ";
136 }
137 retval += expected.toString();
138 return retval;
139 }
140
141 /**
142 * The end of line string for this machine.
143 */
144 protected String eol = System.getProperty("line.separator", "\n");
145
146 /**
147 * Used to convert raw characters to their escaped version
148 * when these raw version cannot be used as part of an ASCII
149 * string literal.
150 */
151 protected String add_escapes(String str) {
152 StringBuffer retval = new StringBuffer();
153 char ch;
154 for (int i = 0; i < str.length(); i++) {
155 switch (str.charAt(i))
156 {
157 case 0 :
158 continue;
159 case '\b':
160 retval.append("\\b");
161 continue;
162 case '\t':
163 retval.append("\\t");
164 continue;
165 case '\n':
166 retval.append("\\n");
167 continue;
168 case '\f':
169 retval.append("\\f");
170 continue;
171 case '\r':
172 retval.append("\\r");
173 continue;
174 case '\"':
175 retval.append("\\\"");
176 continue;
177 case '\'':
178 retval.append("\\\'");
179 continue;
180 case '\\':
181 retval.append("\\\\");
182 continue;
183 default:
184 if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) {
185 String s = "0000" + Integer.toString(ch, 16);
186 retval.append("\\u" + s.substring(s.length() - 4, s.length()));
187 } else {
188 retval.append(ch);
189 }
190 continue;
191 }
192 }
193 return retval.toString();
194 }
195
196 }