Source Code Cross Referenced for ParseException.java in  » Workflow-Engines » jbpm-jpdl-3.2.2 » org » jbpm » jpdl » el » parser » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Workflow Engines » jbpm jpdl 3.2.2 » org.jbpm.jpdl.el.parser 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


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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