1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 */ 18 /* Generated By:JavaCC: Do not edit this line. ParseException.java Version 0.7pre6 */ 19 package Mini; 20 21 /** 22 * This exception is thrown when parse errors are encountered. 23 * You can explicitly create objects of this exception type by 24 * calling the method generateParseException in the generated 25 * parser. 26 * 27 * You can modify this class to customize your error reporting 28 * mechanisms so long as you retain the public fields. 29 */ 30 public class ParseException extends Exception { 31 32 /** 33 * This constructor is used by the method "generateParseException" 34 * in the generated parser. Calling this constructor generates 35 * a new object of this type with the fields "currentToken", 36 * "expectedTokenSequences", and "tokenImage" set. The boolean 37 * flag "specialConstructor" is also set to true to indicate that 38 * this constructor was used to create this object. 39 * This constructor calls its super class with the empty string 40 * to force the "toString" method of parent class "Throwable" to 41 * print the error message in the form: 42 * ParseException: <result of getMessage> 43 */ ParseException(Token currentTokenVal, int[][] expectedTokenSequencesVal, String[] tokenImageVal )44 public ParseException(Token currentTokenVal, 45 int[][] expectedTokenSequencesVal, 46 String[] tokenImageVal 47 ) 48 { 49 super(""); 50 specialConstructor = true; 51 currentToken = currentTokenVal; 52 expectedTokenSequences = expectedTokenSequencesVal; 53 tokenImage = tokenImageVal; 54 } 55 56 /** 57 * The following constructors are for use by you for whatever 58 * purpose you can think of. Constructing the exception in this 59 * manner makes the exception behave in the normal way - i.e., as 60 * documented in the class "Throwable". The fields "errorToken", 61 * "expectedTokenSequences", and "tokenImage" do not contain 62 * relevant information. The JavaCC generated code does not use 63 * these constructors. 64 */ 65 ParseException()66 public ParseException() { 67 super(); 68 specialConstructor = false; 69 } 70 ParseException(String message)71 public ParseException(String message) { 72 super(message); 73 specialConstructor = false; 74 } 75 76 /** 77 * This variable determines which constructor was used to create 78 * this object and thereby affects the semantics of the 79 * "getMessage" method (see below). 80 */ 81 protected boolean specialConstructor; 82 83 /** 84 * This is the last token that has been consumed successfully. If 85 * this object has been created due to a parse error, the token 86 * followng this token will (therefore) be the first error token. 87 */ 88 public Token currentToken; 89 90 /** 91 * Each entry in this array is an array of integers. Each array 92 * of integers represents a sequence of tokens (by their ordinal 93 * values) that is expected at this point of the parse. 94 */ 95 public int[][] expectedTokenSequences; 96 97 /** 98 * This is a reference to the "tokenImage" array of the generated 99 * parser within which the parse error occurred. This array is 100 * defined in the generated ...Constants interface. 101 */ 102 public String[] tokenImage; 103 104 /** 105 * This method has the standard behavior when this object has been 106 * created using the standard constructors. Otherwise, it uses 107 * "currentToken" and "expectedTokenSequences" to generate a parse 108 * error message and returns it. If this object has been created 109 * due to a parse error, and you do not catch it (it gets thrown 110 * from the parser), then this method is called during the printing 111 * of the final stack trace, and hence the correct error message 112 * gets displayed. 113 */ 114 @Override getMessage()115 public String getMessage() { 116 if (!specialConstructor) { 117 return super.getMessage(); 118 } 119 String expected = ""; 120 int maxSize = 0; 121 for (int i = 0; i < expectedTokenSequences.length; i++) { 122 if (maxSize < expectedTokenSequences[i].length) { 123 maxSize = expectedTokenSequences[i].length; 124 } 125 for (int j = 0; j < expectedTokenSequences[i].length; j++) { 126 expected += tokenImage[expectedTokenSequences[i][j]] + " "; 127 } 128 if (expectedTokenSequences[i][expectedTokenSequences[i].length - 1] != 0) { 129 expected += "..."; 130 } 131 expected += eol + " "; 132 } 133 String retval = "Encountered \""; 134 Token tok = currentToken.next; 135 for (int i = 0; i < maxSize; i++) { 136 if (i != 0) { 137 retval += " "; 138 } 139 if (tok.kind == 0) { 140 retval += tokenImage[0]; 141 break; 142 } 143 retval += add_escapes(tok.image); 144 tok = tok.next; 145 } 146 retval += "\" at line " + currentToken.next.beginLine + ", column " + currentToken.next.beginColumn + "." + 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 */ add_escapes(String str)166 protected String add_escapes(String str) { 167 StringBuffer retval = new StringBuffer(); 168 char ch; 169 for (int i = 0; i < str.length(); i++) { 170 switch (str.charAt(i)) 171 { 172 case 0 : 173 continue; 174 case '\b': 175 retval.append("\\b"); 176 continue; 177 case '\t': 178 retval.append("\\t"); 179 continue; 180 case '\n': 181 retval.append("\\n"); 182 continue; 183 case '\f': 184 retval.append("\\f"); 185 continue; 186 case '\r': 187 retval.append("\\r"); 188 continue; 189 case '\"': 190 retval.append("\\\""); 191 continue; 192 case '\'': 193 retval.append("\\\'"); 194 continue; 195 case '\\': 196 retval.append("\\\\"); 197 continue; 198 default: 199 if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) { 200 String s = "0000" + Integer.toString(ch, 16); 201 retval.append("\\u" + 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 } 212