001: /*
002: * Copyright 2002-2006 The Apache Software Foundation.
003: *
004: * Licensed under the Apache License, Version 2.0 (the "License");
005: * you may not use this file except in compliance with the License.
006: * You may obtain a copy of the License at
007: *
008: * http://www.apache.org/licenses/LICENSE-2.0
009: *
010: * Unless required by applicable law or agreed to in writing, software
011: * distributed under the License is distributed on an "AS IS" BASIS,
012: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013: * See the License for the specific language governing permissions and
014: * limitations under the License.
015: */
016: /* Generated By:JavaCC: Do not edit this line. ParseException.java Version 2.1 */
017: package org.apache.commons.jexl.parser;
018:
019: /**
020: * This exception is thrown when parse errors are encountered. You can
021: * explicitly create objects of this exception type by calling the method
022: * generateParseException in the generated parser.
023: *
024: * You can modify this class to customize your error reporting mechanisms so
025: * long as you retain the public fields.
026: */
027: public class ParseException extends Exception {
028:
029: /** serialization version id jdk13 generated. */
030: static final long serialVersionUID = 654626477565941968L;
031:
032: /**
033: * This constructor is used by the method "generateParseException" in the
034: * generated parser. Calling this constructor generates a new object of this
035: * type with the fields "currentToken", "expectedTokenSequences", and
036: * "tokenImage" set. The boolean flag "specialConstructor" is also set to
037: * true to indicate that this constructor was used to create this object.
038: * This constructor calls its super class with the empty string to force the
039: * "toString" method of parent class "Throwable" to print the error message
040: * in the form: ParseException: (result of getMessage)
041: */
042: public ParseException(Token currentTokenVal,
043: int[][] expectedTokenSequencesVal, String[] tokenImageVal) {
044: super ("");
045: specialConstructor = true;
046: currentToken = currentTokenVal;
047: expectedTokenSequences = expectedTokenSequencesVal;
048: tokenImage = tokenImageVal;
049: }
050:
051: /**
052: * The following constructors are for use by you for whatever purpose you
053: * can think of. Constructing the exception in this manner makes the
054: * exception behave in the normal way - i.e., as documented in the class
055: * "Throwable". The fields "errorToken", "expectedTokenSequences", and
056: * "tokenImage" do not contain relevant information. The JavaCC generated
057: * code does not use these constructors.
058: */
059:
060: public ParseException() {
061: super ();
062: specialConstructor = false;
063: }
064:
065: public ParseException(String message) {
066: super (message);
067: specialConstructor = false;
068: }
069:
070: /**
071: * This variable determines which constructor was used to create this object
072: * and thereby affects the semantics of the "getMessage" method (see below).
073: */
074: protected boolean specialConstructor;
075:
076: /**
077: * This is the last token that has been consumed successfully. If this
078: * object has been created due to a parse error, the token followng this
079: * token will (therefore) be the first error token.
080: */
081: public Token currentToken;
082:
083: /**
084: * Each entry in this array is an array of integers. Each array of integers
085: * represents a sequence of tokens (by their ordinal values) that is
086: * expected at this point of the parse.
087: */
088: public int[][] expectedTokenSequences;
089:
090: /**
091: * This is a reference to the "tokenImage" array of the generated parser
092: * within which the parse error occurred. This array is defined in the
093: * generated ...Constants interface.
094: */
095: public String[] tokenImage;
096:
097: /**
098: * This method has the standard behavior when this object has been created
099: * using the standard constructors. Otherwise, it uses "currentToken" and
100: * "expectedTokenSequences" to generate a parse error message and returns
101: * it. If this object has been created due to a parse error, and you do not
102: * catch it (it gets thrown from the parser), then this method is called
103: * during the printing of the final stack trace, and hence the correct error
104: * message gets displayed.
105: */
106: public String getMessage() {
107: if (!specialConstructor) {
108: return super .getMessage();
109: }
110: String expected = "";
111: int maxSize = 0;
112: for (int i = 0; i < expectedTokenSequences.length; i++) {
113: if (maxSize < expectedTokenSequences[i].length) {
114: maxSize = expectedTokenSequences[i].length;
115: }
116: for (int j = 0; j < expectedTokenSequences[i].length; j++) {
117: expected += tokenImage[expectedTokenSequences[i][j]]
118: + " ";
119: }
120: if (expectedTokenSequences[i][expectedTokenSequences[i].length - 1] != 0) {
121: expected += "...";
122: }
123: expected += eol + " ";
124: }
125: String retval = "Encountered \"";
126: Token tok = currentToken.next;
127: for (int i = 0; i < maxSize; i++) {
128: if (i != 0)
129: retval += " ";
130: if (tok.kind == 0) {
131: retval += tokenImage[0];
132: break;
133: }
134: retval += add_escapes(tok.image);
135: tok = tok.next;
136: }
137: retval += "\" at line " + currentToken.next.beginLine
138: + ", column " + currentToken.next.beginColumn;
139: retval += "." + eol;
140: if (expectedTokenSequences.length == 1) {
141: retval += "Was expecting:" + eol + " ";
142: } else {
143: retval += "Was expecting one of:" + eol + " ";
144: }
145: retval += expected;
146: return retval;
147: }
148:
149: /**
150: * The end of line string for this machine.
151: */
152: protected String eol = System.getProperty("line.separator", "\n");
153:
154: /**
155: * Used to convert raw characters to their escaped version when these raw
156: * version cannot be used as part of an ASCII string literal.
157: */
158: protected String add_escapes(String str) {
159: StringBuffer retval = new StringBuffer();
160: char ch;
161: for (int i = 0; i < str.length(); i++) {
162: switch (str.charAt(i)) {
163: case 0:
164: continue;
165: case '\b':
166: retval.append("\\b");
167: continue;
168: case '\t':
169: retval.append("\\t");
170: continue;
171: case '\n':
172: retval.append("\\n");
173: continue;
174: case '\f':
175: retval.append("\\f");
176: continue;
177: case '\r':
178: retval.append("\\r");
179: continue;
180: case '\"':
181: retval.append("\\\"");
182: continue;
183: case '\'':
184: retval.append("\\\'");
185: continue;
186: case '\\':
187: retval.append("\\\\");
188: continue;
189: default:
190: if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) {
191: String s = "0000" + Integer.toString(ch, 16);
192: retval.append("\\u").append(
193: s.substring(s.length() - 4, s.length()));
194: } else {
195: retval.append(ch);
196: }
197: continue;
198: }
199: }
200: return retval.toString();
201: }
202:
203: }
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