Source Code Cross Referenced for ParseException.java in  » Library » Apache-beehive-1.0.2-src » org » apache » beehive » netui » script » el » parser » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » Apache beehive 1.0.2 src » org.apache.beehive.netui.script.el.parser 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Licensed to the Apache Software Foundation (ASF) under one or more
003:         * contributor license agreements.  See the NOTICE file distributed with
004:         * this work for additional information regarding copyright ownership.
005:         * The ASF licenses this file to You under the Apache License, Version 2.0
006:         * (the "License"); you may not use this file except in compliance with
007:         * the License.  You may obtain a copy of the License at
008:         * 
009:         *     http://www.apache.org/licenses/LICENSE-2.0
010:         * 
011:         * Unless required by applicable law or agreed to in writing, software
012:         * distributed under the License is distributed on an "AS IS" BASIS,
013:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         * See the License for the specific language governing permissions and
015:         * limitations under the License.
016:         *
017:         * $Header:$
018:         */
019:        package org.apache.beehive.netui.script.el.parser;
020:
021:        import org.apache.beehive.netui.util.internal.InternalStringBuilder;
022:
023:        /**
024:         * This exception is thrown when parse errors are encountered.
025:         * You can explicitly create objects of this exception type by
026:         * calling the method generateParseException in the generated
027:         * parser.
028:         * <p/>
029:         * You can modify this class to customize your error reporting
030:         * mechanisms so long as you retain the public fields.
031:         */
032:        public class ParseException extends Exception {
033:
034:            /**
035:             * This constructor is used by the method "generateParseException"
036:             * in the generated parser.  Calling this constructor generates
037:             * a new object of this type with the fields "currentToken",
038:             * "expectedTokenSequences", and "tokenImage" set.  The boolean
039:             * flag "specialConstructor" is also set to true to indicate that
040:             * this constructor was used to create this object.
041:             * This constructor calls its super class with the empty string
042:             * to force the "toString" method of parent class "Throwable" to
043:             * print the error message in the form:
044:             * ParseException: <result of getMessage>
045:             */
046:            public ParseException(Token currentTokenVal,
047:                    int[][] expectedTokenSequencesVal, String[] tokenImageVal) {
048:                super ("");
049:                specialConstructor = true;
050:                currentToken = currentTokenVal;
051:                expectedTokenSequences = expectedTokenSequencesVal;
052:                tokenImage = tokenImageVal;
053:            }
054:
055:            /**
056:             * The following constructors are for use by you for whatever
057:             * purpose you can think of.  Constructing the exception in this
058:             * manner makes the exception behave in the normal way - i.e., as
059:             * documented in the class "Throwable".  The fields "errorToken",
060:             * "expectedTokenSequences", and "tokenImage" do not contain
061:             * relevant information.  The JavaCC generated code does not use
062:             * these constructors.
063:             */
064:
065:            public ParseException() {
066:                super ();
067:                specialConstructor = false;
068:            }
069:
070:            public ParseException(String message) {
071:                super (message);
072:                specialConstructor = false;
073:            }
074:
075:            /**
076:             * This variable determines which constructor was used to create
077:             * this object and thereby affects the semantics of the
078:             * "getMessage" method (see below).
079:             */
080:            protected boolean specialConstructor;
081:
082:            /**
083:             * This is the last token that has been consumed successfully.  If
084:             * this object has been created due to a parse error, the token
085:             * followng this token will (therefore) be the first error token.
086:             */
087:            public Token currentToken;
088:
089:            /**
090:             * Each entry in this array is an array of integers.  Each array
091:             * of integers represents a sequence of tokens (by their ordinal
092:             * values) that is expected at this point of the parse.
093:             */
094:            public int[][] expectedTokenSequences;
095:
096:            /**
097:             * This is a reference to the "tokenImage" array of the generated
098:             * parser within which the parse error occurred.  This array is
099:             * defined in the generated ...Constants interface.
100:             */
101:            public String[] tokenImage;
102:
103:            /**
104:             * This method has the standard behavior when this object has been
105:             * created using the standard constructors.  Otherwise, it uses
106:             * "currentToken" and "expectedTokenSequences" to generate a parse
107:             * error message and returns it.  If this object has been created
108:             * due to a parse error, and you do not catch it (it gets thrown
109:             * from the parser), then this method is called during the printing
110:             * of the final stack trace, and hence the correct error message
111:             * gets displayed.
112:             */
113:            public String getMessage() {
114:                if (!specialConstructor) {
115:                    return super .getMessage();
116:                }
117:                String expected = "";
118:                int maxSize = 0;
119:                for (int i = 0; i < expectedTokenSequences.length; i++) {
120:                    if (maxSize < expectedTokenSequences[i].length) {
121:                        maxSize = expectedTokenSequences[i].length;
122:                    }
123:                    for (int j = 0; j < expectedTokenSequences[i].length; j++) {
124:                        expected += tokenImage[expectedTokenSequences[i][j]]
125:                                + " ";
126:                    }
127:                    if (expectedTokenSequences[i][expectedTokenSequences[i].length - 1] != 0) {
128:                        expected += "...";
129:                    }
130:                    expected += eol + "    ";
131:                }
132:                String retval = "Encountered \"";
133:                Token tok = currentToken.next;
134:                for (int i = 0; i < maxSize; i++) {
135:                    if (i != 0)
136:                        retval += " ";
137:                    if (tok.kind == 0) {
138:                        retval += tokenImage[0];
139:                        break;
140:                    }
141:                    retval += add_escapes(tok.image);
142:                    tok = tok.next;
143:                }
144:                retval += "\" at line " + currentToken.next.beginLine
145:                        + ", column " + currentToken.next.beginColumn;
146:                retval += "." + eol;
147:                if (expectedTokenSequences.length == 1) {
148:                    retval += "Was expecting:" + eol + "    ";
149:                } else {
150:                    retval += "Was expecting one of:" + eol + "    ";
151:                }
152:                retval += expected;
153:                return retval;
154:            }
155:
156:            /**
157:             * The end of line string for this machine.
158:             */
159:            protected String eol = System.getProperty("line.separator", "\n");
160:
161:            /**
162:             * Used to convert raw characters to their escaped version
163:             * when these raw version cannot be used as part of an ASCII
164:             * string literal.
165:             */
166:            protected String add_escapes(String str) {
167:                InternalStringBuilder retval = new InternalStringBuilder();
168:                char ch;
169:                for (int i = 0; i < str.length(); i++) {
170:                    switch (str.charAt(i)) {
171:                    case 0:
172:                        continue;
173:                    case '\b':
174:                        retval.append("\\b");
175:                        continue;
176:                    case '\t':
177:                        retval.append("\\t");
178:                        continue;
179:                    case '\n':
180:                        retval.append("\\n");
181:                        continue;
182:                    case '\f':
183:                        retval.append("\\f");
184:                        continue;
185:                    case '\r':
186:                        retval.append("\\r");
187:                        continue;
188:                    case '\"':
189:                        retval.append("\\\"");
190:                        continue;
191:                    case '\'':
192:                        retval.append("\\\'");
193:                        continue;
194:                    case '\\':
195:                        retval.append("\\\\");
196:                        continue;
197:                    default:
198:                        if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) {
199:                            String s = "0000" + Integer.toString(ch, 16);
200:                            retval.append("\\u"
201:                                    + s.substring(s.length() - 4, s.length()));
202:                        } else {
203:                            retval.append(ch);
204:                        }
205:                        continue;
206:                    }
207:                }
208:                return retval.toString();
209:            }
210:
211:        }
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