1
2
3 package jminusminus;
4
5
14 public class ParseException extends Exception {
15
16
21 private static final long serialVersionUID = 1L;
22
23
26 protected static String EOL = System.getProperty("line.separator", "\n");
27
28
34 public ParseException(Token currentTokenVal,
35 int[][] expectedTokenSequencesVal,
36 String[] tokenImageVal
37 )
38 {
39 super(initialise(currentTokenVal, expectedTokenSequencesVal, tokenImageVal));
40 currentToken = currentTokenVal;
41 expectedTokenSequences = expectedTokenSequencesVal;
42 tokenImage = tokenImageVal;
43 }
44
45
54
55 public ParseException() {
56 super();
57 }
58
59
60 public ParseException(String message) {
61 super(message);
62 }
63
64
65
70 public Token currentToken;
71
72
77 public int[][] expectedTokenSequences;
78
79
84 public String[] tokenImage;
85
86
93 private static String initialise(Token currentToken,
94 int[][] expectedTokenSequences,
95 String[] tokenImage) {
96
97 StringBuffer expected = new StringBuffer();
98 int maxSize = 0;
99 for (int i = 0; i < expectedTokenSequences.length; i++) {
100 if (maxSize < expectedTokenSequences[i].length) {
101 maxSize = expectedTokenSequences[i].length;
102 }
103 for (int j = 0; j < expectedTokenSequences[i].length; j++) {
104 expected.append(tokenImage[expectedTokenSequences[i][j]]).append(' ');
105 }
106 if (expectedTokenSequences[i][expectedTokenSequences[i].length - 1] != 0) {
107 expected.append("...");
108 }
109 expected.append(EOL).append(" ");
110 }
111 String retval = "Encountered \"";
112 Token tok = currentToken.next;
113 for (int i = 0; i < maxSize; i++) {
114 if (i != 0) retval += " ";
115 if (tok.kind == 0) {
116 retval += tokenImage[0];
117 break;
118 }
119 retval += " " + tokenImage[tok.kind];
120 retval += " \"";
121 retval += add_escapes(tok.image);
122 retval += " \"";
123 tok = tok.next;
124 }
125 retval += "\" at line " + currentToken.next.beginLine + ", column " + currentToken.next.beginColumn;
126 retval += "." + EOL;
127
128
129 if (expectedTokenSequences.length == 0) {
130 } else {
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 }
139
140 return retval;
141 }
142
143
144
149 static String add_escapes(String str) {
150 StringBuffer retval = new StringBuffer();
151 char ch;
152 for (int i = 0; i < str.length(); i++) {
153 switch (str.charAt(i))
154 {
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 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
194