Source Code Cross Referenced for ParseException.java in  » Testing » Marathon » org » python » parser » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Testing » Marathon » org.python.parser 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* Generated By:JavaCC: Do not edit this line. ParseException.java Version 0.7pre6 */
002:        package org.python.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:            /**
016:             * This constructor is used by the method "generateParseException"
017:             * in the generated parser.  Calling this constructor generates
018:             * a new object of this type with the fields "currentToken",
019:             * "expectedTokenSequences", and "tokenImage" set.  The boolean
020:             * flag "specialConstructor" is also set to true to indicate that
021:             * this constructor was used to create this object.
022:             * This constructor calls its super class with the empty string
023:             * to force the "toString" method of parent class "Throwable" to
024:             * print the error message in the form:
025:             *     ParseException: <result of getMessage>
026:             */
027:            public ParseException(Token currentTokenVal,
028:                    int[][] expectedTokenSequencesVal, String[] tokenImageVal) {
029:                super ("");
030:                specialConstructor = true;
031:                currentToken = currentTokenVal;
032:                expectedTokenSequences = expectedTokenSequencesVal;
033:                tokenImage = tokenImageVal;
034:            }
035:
036:            /**
037:             * The following constructors are for use by you for whatever
038:             * purpose you can think of.  Constructing the exception in this
039:             * manner makes the exception behave in the normal way - i.e., as
040:             * documented in the class "Throwable".  The fields "errorToken",
041:             * "expectedTokenSequences", and "tokenImage" do not contain
042:             * relevant information.  The JavaCC generated code does not use
043:             * these constructors.
044:             */
045:
046:            public ParseException() {
047:                super ();
048:                specialConstructor = false;
049:            }
050:
051:            public ParseException(String message) {
052:                super (message);
053:                specialConstructor = false;
054:            }
055:
056:            public ParseException(String message, SimpleNode node) {
057:                super (message);
058:                // If a node is passed in, provide just enough info to get current line/column out
059:                Token t = new Token();
060:                t.beginLine = node.beginLine;
061:                t.beginColumn = node.beginColumn;
062:
063:                currentToken = new Token();
064:                currentToken.next = t;
065:                t = currentToken;
066:                t.beginLine = node.beginLine;
067:                t.beginColumn = node.beginColumn;
068:
069:                specialConstructor = false;
070:            }
071:
072:            /**
073:             * This variable determines which constructor was used to create
074:             * this object and thereby affects the semantics of the
075:             * "getMessage" method (see below).
076:             */
077:            protected boolean specialConstructor;
078:
079:            /**
080:             * This is the last token that has been consumed successfully.  If
081:             * this object has been created due to a parse error, the token
082:             * followng this token will (therefore) be the first error token.
083:             */
084:            public Token currentToken;
085:
086:            /**
087:             * Each entry in this array is an array of integers.  Each array
088:             * of integers represents a sequence of tokens (by their ordinal
089:             * values) that is expected at this point of the parse.
090:             */
091:            public int[][] expectedTokenSequences;
092:
093:            /**
094:             * This is a reference to the "tokenImage" array of the generated
095:             * parser within which the parse error occurred.  This array is
096:             * defined in the generated ...Constants interface.
097:             */
098:            public String[] tokenImage;
099:
100:            /**
101:             * This method has the standard behavior when this object has been
102:             * created using the standard constructors.  Otherwise, it uses
103:             * "currentToken" and "expectedTokenSequences" to generate a parse
104:             * error message and returns it.  If this object has been created
105:             * due to a parse error, and you do not catch it (it gets thrown
106:             * from the parser), then this method is called during the printing
107:             * of the final stack trace, and hence the correct error message
108:             * gets displayed.
109:             */
110:            public static boolean verboseExceptions = false;
111:
112:            public String getMessage() {
113:                if (!specialConstructor) {
114:                    return super .getMessage();
115:                }
116:                if (verboseExceptions) {
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:                            + 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:                } else {
155:                    return "invalid syntax";
156:                }
157:            }
158:
159:            /**
160:             * The end of line string for this machine.
161:             */
162:            protected String eol = System.getProperty("line.separator", "\n");
163:
164:            /**
165:             * Used to convert raw characters to their escaped version
166:             * when these raw version cannot be used as part of an ASCII
167:             * string literal.
168:             */
169:            protected String add_escapes(String str) {
170:                StringBuffer retval = new StringBuffer();
171:                char ch;
172:                for (int i = 0; i < str.length(); i++) {
173:                    switch (str.charAt(i)) {
174:                    case 0:
175:                        continue;
176:                    case '\b':
177:                        retval.append("\\b");
178:                        continue;
179:                    case '\t':
180:                        retval.append("\\t");
181:                        continue;
182:                    case '\n':
183:                        retval.append("\\n");
184:                        continue;
185:                    case '\f':
186:                        retval.append("\\f");
187:                        continue;
188:                    case '\r':
189:                        retval.append("\\r");
190:                        continue;
191:                    case '\"':
192:                        retval.append("\\\"");
193:                        continue;
194:                    case '\'':
195:                        retval.append("\\\'");
196:                        continue;
197:                    case '\\':
198:                        retval.append("\\\\");
199:                        continue;
200:                    default:
201:                        if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) {
202:                            String s = "0000" + Integer.toString(ch, 16);
203:                            retval.append("\\u"
204:                                    + s.substring(s.length() - 4, s.length()));
205:                        } else {
206:                            retval.append(ch);
207:                        }
208:                        continue;
209:                    }
210:                }
211:                return retval.toString();
212:            }
213:
214:        }
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