001: /* Generated By:JavaCC: Do not edit this line. ParseException.java Version 2.1 */
002: package org.jbpm.jpdl.el.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 Exception {
014:
015: private static final long serialVersionUID = 1L;
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(ELToken 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: /**
059: * This variable determines which constructor was used to create
060: * this object and thereby affects the semantics of the
061: * "getMessage" method (see below).
062: */
063: protected boolean specialConstructor;
064:
065: /**
066: * This is the last token that has been consumed successfully. If
067: * this object has been created due to a parse error, the token
068: * followng this token will (therefore) be the first error token.
069: */
070: public ELToken currentToken;
071:
072: /**
073: * Each entry in this array is an array of integers. Each array
074: * of integers represents a sequence of tokens (by their ordinal
075: * values) that is expected at this point of the parse.
076: */
077: public int[][] expectedTokenSequences;
078:
079: /**
080: * This is a reference to the "tokenImage" array of the generated
081: * parser within which the parse error occurred. This array is
082: * defined in the generated ...Constants interface.
083: */
084: public String[] tokenImage;
085:
086: /**
087: * This method has the standard behavior when this object has been
088: * created using the standard constructors. Otherwise, it uses
089: * "currentToken" and "expectedTokenSequences" to generate a parse
090: * error message and returns it. If this object has been created
091: * due to a parse error, and you do not catch it (it gets thrown
092: * from the parser), then this method is called during the printing
093: * of the final stack trace, and hence the correct error message
094: * gets displayed.
095: */
096: public String getMessage() {
097: if (!specialConstructor) {
098: return super .getMessage();
099: }
100: String expected = "";
101: int maxSize = 0;
102: for (int i = 0; i < expectedTokenSequences.length; i++) {
103: if (maxSize < expectedTokenSequences[i].length) {
104: maxSize = expectedTokenSequences[i].length;
105: }
106: for (int j = 0; j < expectedTokenSequences[i].length; j++) {
107: expected += tokenImage[expectedTokenSequences[i][j]]
108: + " ";
109: }
110: if (expectedTokenSequences[i][expectedTokenSequences[i].length - 1] != 0) {
111: expected += "...";
112: }
113: expected += eol + " ";
114: }
115: String retval = "Encountered \"";
116: ELToken tok = currentToken.next;
117: for (int i = 0; i < maxSize; i++) {
118: if (i != 0)
119: retval += " ";
120: if (tok.kind == 0) {
121: retval += tokenImage[0];
122: break;
123: }
124: retval += add_escapes(tok.image);
125: tok = tok.next;
126: }
127: retval += "\" at line " + currentToken.next.beginLine
128: + ", column " + currentToken.next.beginColumn;
129: retval += "." + eol;
130: if (expectedTokenSequences.length == 1) {
131: retval += "Was expecting:" + eol + " ";
132: } else {
133: retval += "Was expecting one of:" + eol + " ";
134: }
135: retval += expected;
136: return retval;
137: }
138:
139: /**
140: * The end of line string for this machine.
141: */
142: protected String eol = System.getProperty("line.separator", "\n");
143:
144: /**
145: * Used to convert raw characters to their escaped version
146: * when these raw version cannot be used as part of an ASCII
147: * string literal.
148: */
149: protected 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: case 0:
155: continue;
156: case '\b':
157: retval.append("\\b");
158: continue;
159: case '\t':
160: retval.append("\\t");
161: continue;
162: case '\n':
163: retval.append("\\n");
164: continue;
165: case '\f':
166: retval.append("\\f");
167: continue;
168: case '\r':
169: retval.append("\\r");
170: continue;
171: case '\"':
172: retval.append("\\\"");
173: continue;
174: case '\'':
175: retval.append("\\\'");
176: continue;
177: case '\\':
178: retval.append("\\\\");
179: continue;
180: default:
181: if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) {
182: String s = "0000" + Integer.toString(ch, 16);
183: retval.append("\\u"
184: + 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: }
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