001 /* Generated By:JavaCC: Do not edit this line. ParseException.java Version 2.1 */ 002 package org.activemq.selector; 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 * <p/> 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, 029 String[] tokenImageVal) { 030 super(""); 031 specialConstructor = true; 032 currentToken = currentTokenVal; 033 expectedTokenSequences = expectedTokenSequencesVal; 034 tokenImage = tokenImageVal; 035 } 036 037 /** 038 * The following constructors are for use by you for whatever 039 * purpose you can think of. Constructing the exception in this 040 * manner makes the exception behave in the normal way - i.e., as 041 * documented in the class "Throwable". The fields "errorToken", 042 * "expectedTokenSequences", and "tokenImage" do not contain 043 * relevant information. The JavaCC generated code does not use 044 * these constructors. 045 */ 046 047 public ParseException() { 048 super(); 049 specialConstructor = false; 050 } 051 052 public ParseException(String message) { 053 super(message); 054 specialConstructor = false; 055 } 056 057 /** 058 * This variable determines which constructor was used to create 059 * this object and thereby affects the semantics of the 060 * "getMessage" method (see below). 061 */ 062 protected boolean specialConstructor; 063 064 /** 065 * This is the last token that has been consumed successfully. If 066 * this object has been created due to a parse error, the token 067 * followng this token will (therefore) be the first error token. 068 */ 069 public Token currentToken; 070 071 /** 072 * Each entry in this array is an array of integers. Each array 073 * of integers represents a sequence of tokens (by their ordinal 074 * values) that is expected at this point of the parse. 075 */ 076 public int[][] expectedTokenSequences; 077 078 /** 079 * This is a reference to the "tokenImage" array of the generated 080 * parser within which the parse error occurred. This array is 081 * defined in the generated ...Constants interface. 082 */ 083 public String[] tokenImage; 084 085 /** 086 * This method has the standard behavior when this object has been 087 * created using the standard constructors. Otherwise, it uses 088 * "currentToken" and "expectedTokenSequences" to generate a parse 089 * error message and returns it. If this object has been created 090 * due to a parse error, and you do not catch it (it gets thrown 091 * from the parser), then this method is called during the printing 092 * of the final stack trace, and hence the correct error message 093 * gets displayed. 094 */ 095 public String getMessage() { 096 if (!specialConstructor) { 097 return super.getMessage(); 098 } 099 String expected = ""; 100 int maxSize = 0; 101 for (int i = 0; i < expectedTokenSequences.length; i++) { 102 if (maxSize < expectedTokenSequences[i].length) { 103 maxSize = expectedTokenSequences[i].length; 104 } 105 for (int j = 0; j < expectedTokenSequences[i].length; j++) { 106 expected += tokenImage[expectedTokenSequences[i][j]] + " "; 107 } 108 if (expectedTokenSequences[i][expectedTokenSequences[i].length - 1] != 0) { 109 expected += "..."; 110 } 111 expected += eol + " "; 112 } 113 String retval = "Encountered \""; 114 Token tok = currentToken.next; 115 for (int i = 0; i < maxSize; i++) { 116 if (i != 0) { 117 retval += " "; 118 } 119 if (tok.kind == 0) { 120 retval += tokenImage[0]; 121 break; 122 } 123 retval += add_escapes(tok.image); 124 tok = tok.next; 125 } 126 retval += "\" at line " + currentToken.next.beginLine + ", column " + currentToken.next.beginColumn; 127 retval += "." + eol; 128 if (expectedTokenSequences.length == 1) { 129 retval += "Was expecting:" + eol + " "; 130 } 131 else { 132 retval += "Was expecting one of:" + eol + " "; 133 } 134 retval += expected; 135 return retval; 136 } 137 138 /** 139 * The end of line string for this machine. 140 */ 141 protected String eol = System.getProperty("line.separator", "\n"); 142 143 /** 144 * Used to convert raw characters to their escaped version 145 * when these raw version cannot be used as part of an ASCII 146 * string literal. 147 */ 148 protected String add_escapes(String str) { 149 StringBuffer retval = new StringBuffer(); 150 char ch; 151 for (int i = 0; i < str.length(); i++) { 152 switch (str.charAt(i)) { 153 case 0: 154 continue; 155 case '\b': 156 retval.append("\\b"); 157 continue; 158 case '\t': 159 retval.append("\\t"); 160 continue; 161 case '\n': 162 retval.append("\\n"); 163 continue; 164 case '\f': 165 retval.append("\\f"); 166 continue; 167 case '\r': 168 retval.append("\\r"); 169 continue; 170 case '\"': 171 retval.append("\\\""); 172 continue; 173 case '\'': 174 retval.append("\\\'"); 175 continue; 176 case '\\': 177 retval.append("\\\\"); 178 continue; 179 default: 180 if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) { 181 String s = "0000" + Integer.toString(ch, 16); 182 retval.append("\\u" + s.substring(s.length() - 4, s.length())); 183 } 184 else { 185 retval.append(ch); 186 } 187 continue; 188 } 189 } 190 return retval.toString(); 191 } 192 193 }