001: /* Generated By:JavaCC: Do not edit this line. ParseException.java Version 3.0 */
002: package jaxx.parser;
003:
004: /**
005: * This exception is thrown when parse errors are encountered.
006: * You can explicitly create objects of this exception type by
007: * calling the method generateParseException in the generated
008: * parser.
009: *
010: * You can modify this class to customize your error reporting
011: * mechanisms so long as you retain the public fields.
012: */
013: public class ParseException extends jaxx.CompilerException {
014: int line;
015: int column;
016:
017: /**
018: * This constructor is used by the method "generateParseException"
019: * in the generated parser. Calling this constructor generates
020: * a new object of this type with the fields "currentToken",
021: * "expectedTokenSequences", and "tokenImage" set. The boolean
022: * flag "specialConstructor" is also set to true to indicate that
023: * this constructor was used to create this object.
024: * This constructor calls its super class with the empty string
025: * to force the "toString" method of parent class "Throwable" to
026: * print the error message in the form:
027: * ParseException: <result of getMessage>
028: */
029: public ParseException(Token currentTokenVal,
030: int[][] expectedTokenSequencesVal, String[] tokenImageVal) {
031: super ("");
032: specialConstructor = true;
033: currentToken = currentTokenVal;
034: expectedTokenSequences = expectedTokenSequencesVal;
035: tokenImage = tokenImageVal;
036: }
037:
038: /**
039: * The following constructors are for use by you for whatever
040: * purpose you can think of. Constructing the exception in this
041: * manner makes the exception behave in the normal way - i.e., as
042: * documented in the class "Throwable". The fields "errorToken",
043: * "expectedTokenSequences", and "tokenImage" do not contain
044: * relevant information. The JavaCC generated code does not use
045: * these constructors.
046: */
047:
048: public ParseException() {
049: super ();
050: specialConstructor = false;
051: }
052:
053: public ParseException(String message) {
054: super (message);
055: specialConstructor = false;
056: }
057:
058: public ParseException(String message, int line, int column) {
059: super (message);
060: specialConstructor = false;
061: this .line = line;
062: this .column = column;
063: }
064:
065: /**
066: * This variable determines which constructor was used to create
067: * this object and thereby affects the semantics of the
068: * "getMessage" method (see below).
069: */
070: protected boolean specialConstructor;
071:
072: /**
073: * This is the last token that has been consumed successfully. If
074: * this object has been created due to a parse error, the token
075: * followng this token will (therefore) be the first error token.
076: */
077: public Token currentToken;
078:
079: /**
080: * Each entry in this array is an array of integers. Each array
081: * of integers represents a sequence of tokens (by their ordinal
082: * values) that is expected at this point of the parse.
083: */
084: public int[][] expectedTokenSequences;
085:
086: /**
087: * This is a reference to the "tokenImage" array of the generated
088: * parser within which the parse error occurred. This array is
089: * defined in the generated ...Constants interface.
090: */
091: public String[] tokenImage;
092:
093: /**
094: * This method has the standard behavior when this object has been
095: * created using the standard constructors. Otherwise, it uses
096: * "currentToken" and "expectedTokenSequences" to generate a parse
097: * error message and returns it. If this object has been created
098: * due to a parse error, and you do not catch it (it gets thrown
099: * from the parser), then this method is called during the printing
100: * of the final stack trace, and hence the correct error message
101: * gets displayed.
102: */
103: public String getMessage() {
104: if (!specialConstructor) {
105: return super .getMessage();
106: }
107: StringBuffer expected = new StringBuffer();
108: int maxSize = 0;
109: for (int i = 0; i < expectedTokenSequences.length; i++) {
110: if (maxSize < expectedTokenSequences[i].length) {
111: maxSize = expectedTokenSequences[i].length;
112: }
113: for (int j = 0; j < expectedTokenSequences[i].length; j++) {
114: expected.append(
115: tokenImage[expectedTokenSequences[i][j]])
116: .append(" ");
117: }
118: if (expectedTokenSequences[i][expectedTokenSequences[i].length - 1] != 0) {
119: expected.append("...");
120: }
121: expected.append(eol).append(" ");
122: }
123: String retval = "Encountered \"";
124: Token tok = currentToken.next;
125: for (int i = 0; i < maxSize; i++) {
126: if (i != 0)
127: retval += " ";
128: if (tok.kind == 0) {
129: retval += tokenImage[0];
130: break;
131: }
132: retval += add_escapes(tok.image);
133: tok = tok.next;
134: }
135: retval += "\" at line " + currentToken.next.beginLine
136: + ", column " + currentToken.next.beginColumn;
137: retval += "." + eol;
138: if (expectedTokenSequences.length == 1) {
139: retval += "Was expecting:" + eol + " ";
140: } else {
141: retval += "Was expecting one of:" + eol + " ";
142: }
143: retval += expected.toString();
144: return retval;
145: }
146:
147: public int getLine() {
148: return line;
149: }
150:
151: public int getColumn() {
152: return column;
153: }
154:
155: /**
156: * The end of line string for this machine.
157: */
158: protected String eol = System.getProperty("line.separator", "\n");
159:
160: /**
161: * Used to convert raw characters to their escaped version
162: * when these raw version cannot be used as part of an ASCII
163: * string literal.
164: */
165: protected String add_escapes(String str) {
166: StringBuffer retval = new StringBuffer();
167: char ch;
168: for (int i = 0; i < str.length(); i++) {
169: switch (str.charAt(i)) {
170: case 0:
171: continue;
172: case '\b':
173: retval.append("\\b");
174: continue;
175: case '\t':
176: retval.append("\\t");
177: continue;
178: case '\n':
179: retval.append("\\n");
180: continue;
181: case '\f':
182: retval.append("\\f");
183: continue;
184: case '\r':
185: retval.append("\\r");
186: continue;
187: case '\"':
188: retval.append("\\\"");
189: continue;
190: case '\'':
191: retval.append("\\\'");
192: continue;
193: case '\\':
194: retval.append("\\\\");
195: continue;
196: default:
197: if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) {
198: String s = "0000" + Integer.toString(ch, 16);
199: retval.append("\\u"
200: + s.substring(s.length() - 4, s.length()));
201: } else {
202: retval.append(ch);
203: }
204: continue;
205: }
206: }
207: return retval.toString();
208: }
209:
210: }
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