001/** 002 * ========================================= 003 * LibLayout : a free Java layouting library 004 * ========================================= 005 * 006 * Project Info: http://www.jfree.org/liblayout/ 007 * Project Lead: Thomas Morgner; 008 * 009 * (C) Copyright 2006, by Pentaho Corperation and Contributors. 010 * 011 * This library is free software; you can redistribute it and/or modify it under the terms 012 * of the GNU Lesser General Public License as published by the Free Software Foundation; 013 * either version 2.1 of the License, or (at your option) any later version. 014 * 015 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 016 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 017 * See the GNU Lesser General Public License for more details. 018 * 019 * You should have received a copy of the GNU Lesser General Public License along with this 020 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, 021 * Boston, MA 02111-1307, USA. 022 * 023 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 024 * in the United States and other countries.] 025 * 026 * ------------ 027 * ParseException.java 028 * ------------ 029 * (C) Copyright 2006, by Pentaho Corperation. 030 * 031 * Original Author: Thomas Morgner; 032 * Contributor(s): -; 033 * 034 * $Id: ParseException.java,v 1.1.1.1 2006/04/23 14:51:51 taqua Exp $ 035 * 036 * Changes 037 * ------- 038 * 039 * 040 */ 041 042/* Generated By:JavaCC: Do not edit this line. ParseException.java Version 3.0 */ 043package org.w3c.flute.parser; 044 045import org.w3c.css.sac.CSSException; 046 047/** 048 * This exception is thrown when parse errors are encountered. 049 * You can explicitly create objects of this exception type by 050 * calling the method generateParseException in the generated 051 * parser. 052 * 053 * You can modify this class to customize your error reporting 054 * mechanisms so long as you retain the public fields. 055 */ 056public class ParseException extends CSSException { 057 058 /** 059 * This constructor is used by the method "generateParseException" 060 * in the generated parser. Calling this constructor generates 061 * a new object of this type with the fields "currentToken", 062 * "expectedTokenSequences", and "tokenImage" set. The boolean 063 * flag "specialConstructor" is also set to true to indicate that 064 * this constructor was used to create this object. 065 * This constructor calls its super class with the empty string 066 * to force the "toString" method of parent class "Throwable" to 067 * print the error message in the form: 068 * ParseException: <result of getMessage> 069 */ 070 public ParseException(Token currentTokenVal, 071 int[][] expectedTokenSequencesVal, 072 String[] tokenImageVal 073 ) 074 { 075 super(""); 076 specialConstructor = true; 077 currentToken = currentTokenVal; 078 expectedTokenSequences = expectedTokenSequencesVal; 079 tokenImage = tokenImageVal; 080 } 081 082 /** 083 * The following constructors are for use by you for whatever 084 * purpose you can think of. Constructing the exception in this 085 * manner makes the exception behave in the normal way - i.e., as 086 * documented in the class "Throwable". The fields "errorToken", 087 * "expectedTokenSequences", and "tokenImage" do not contain 088 * relevant information. The JavaCC generated code does not use 089 * these constructors. 090 */ 091 092 public ParseException() { 093 super(); 094 specialConstructor = false; 095 } 096 097 public ParseException(String message) { 098 super(message); 099 specialConstructor = false; 100 } 101 102 /** 103 * This variable determines which constructor was used to create 104 * this object and thereby affects the semantics of the 105 * "getMessage" method (see below). 106 */ 107 protected boolean specialConstructor; 108 109 /** 110 * This is the last token that has been consumed successfully. If 111 * this object has been created due to a parse error, the token 112 * followng this token will (therefore) be the first error token. 113 */ 114 public Token currentToken; 115 116 /** 117 * Each entry in this array is an array of integers. Each array 118 * of integers represents a sequence of tokens (by their ordinal 119 * values) that is expected at this point of the parse. 120 */ 121 public int[][] expectedTokenSequences; 122 123 /** 124 * This is a reference to the "tokenImage" array of the generated 125 * parser within which the parse error occurred. This array is 126 * defined in the generated ...Constants interface. 127 */ 128 public String[] tokenImage; 129 130 /** 131 * This method has the standard behavior when this object has been 132 * created using the standard constructors. Otherwise, it uses 133 * "currentToken" and "expectedTokenSequences" to generate a parse 134 * error message and returns it. If this object has been created 135 * due to a parse error, and you do not catch it (it gets thrown 136 * from the parser), then this method is called during the printing 137 * of the final stack trace, and hence the correct error message 138 * gets displayed. 139 */ 140 public String getMessage() { 141 if (!specialConstructor) { 142 return super.getMessage(); 143 } 144 String expected = ""; 145 int maxSize = 0; 146 for (int i = 0; i < expectedTokenSequences.length; i++) { 147 if (maxSize < expectedTokenSequences[i].length) { 148 maxSize = expectedTokenSequences[i].length; 149 } 150 for (int j = 0; j < expectedTokenSequences[i].length; j++) { 151 expected += tokenImage[expectedTokenSequences[i][j]] + " "; 152 } 153 if (expectedTokenSequences[i][expectedTokenSequences[i].length - 1] != 0) { 154 expected += "..."; 155 } 156 expected += eol + " "; 157 } 158 String retval = "Encountered \""; 159 Token tok = currentToken.next; 160 for (int i = 0; i < maxSize; i++) { 161 if (i != 0) retval += " "; 162 if (tok.kind == 0) { 163 retval += tokenImage[0]; 164 break; 165 } 166 retval += add_escapes(tok.image); 167 tok = tok.next; 168 } 169 retval += "\" at line " + currentToken.next.beginLine + ", column " + currentToken.next.beginColumn; 170 retval += "." + eol; 171 if (expectedTokenSequences.length == 1) { 172 retval += "Was expecting:" + eol + " "; 173 } else { 174 retval += "Was expecting one of:" + eol + " "; 175 } 176 retval += expected; 177 return retval; 178 } 179 180 /** 181 * The end of line string for this machine. 182 */ 183 protected String eol = System.getProperty("line.separator", "\n"); 184 185 /** 186 * Used to convert raw characters to their escaped version 187 * when these raw version cannot be used as part of an ASCII 188 * string literal. 189 */ 190 protected String add_escapes(String str) { 191 StringBuffer retval = new StringBuffer(); 192 char ch; 193 for (int i = 0; i < str.length(); i++) { 194 switch (str.charAt(i)) 195 { 196 case 0 : 197 continue; 198 case '\b': 199 retval.append("\\b"); 200 continue; 201 case '\t': 202 retval.append("\\t"); 203 continue; 204 case '\n': 205 retval.append("\\n"); 206 continue; 207 case '\f': 208 retval.append("\\f"); 209 continue; 210 case '\r': 211 retval.append("\\r"); 212 continue; 213 case '\"': 214 retval.append("\\\""); 215 continue; 216 case '\'': 217 retval.append("\\\'"); 218 continue; 219 case '\\': 220 retval.append("\\\\"); 221 continue; 222 default: 223 if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) { 224 String s = "0000" + Integer.toString(ch, 16); 225 retval.append("\\u" + s.substring(s.length() - 4, s.length())); 226 } else { 227 retval.append(ch); 228 } 229 continue; 230 } 231 } 232 return retval.toString(); 233 } 234 235}