001 /* Generated By:JavaCC: Do not edit this line. TokenMgrError.java Version 3.0 */
002 package net.hydromatic.clapham.parser.wirth;
003
004 public class TokenMgrError extends Error
005 {
006 /*
007 * Ordinals for various reasons why an Error of this type can be thrown.
008 */
009
010 /**
011 * Lexical error occured.
012 */
013 static final int LEXICAL_ERROR = 0;
014
015 /**
016 * An attempt wass made to create a second instance of a static token manager.
017 */
018 static final int STATIC_LEXER_ERROR = 1;
019
020 /**
021 * Tried to change to an invalid lexical state.
022 */
023 static final int INVALID_LEXICAL_STATE = 2;
024
025 /**
026 * Detected (and bailed out of) an infinite loop in the token manager.
027 */
028 static final int LOOP_DETECTED = 3;
029
030 /**
031 * Indicates the reason why the exception is thrown. It will have
032 * one of the above 4 values.
033 */
034 int errorCode;
035
036 /**
037 * Replaces unprintable characters by their espaced (or unicode escaped)
038 * equivalents in the given string
039 */
040 protected static final String addEscapes(String str) {
041 StringBuffer retval = new StringBuffer();
042 char ch;
043 for (int i = 0; i < str.length(); i++) {
044 switch (str.charAt(i))
045 {
046 case 0 :
047 continue;
048 case '\b':
049 retval.append("\\b");
050 continue;
051 case '\t':
052 retval.append("\\t");
053 continue;
054 case '\n':
055 retval.append("\\n");
056 continue;
057 case '\f':
058 retval.append("\\f");
059 continue;
060 case '\r':
061 retval.append("\\r");
062 continue;
063 case '\"':
064 retval.append("\\\"");
065 continue;
066 case '\'':
067 retval.append("\\\'");
068 continue;
069 case '\\':
070 retval.append("\\\\");
071 continue;
072 default:
073 if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) {
074 String s = "0000" + Integer.toString(ch, 16);
075 retval.append("\\u" + s.substring(s.length() - 4, s.length()));
076 } else {
077 retval.append(ch);
078 }
079 continue;
080 }
081 }
082 return retval.toString();
083 }
084
085 /**
086 * Returns a detailed message for the Error when it is thrown by the
087 * token manager to indicate a lexical error.
088 * Parameters :
089 * EOFSeen : indicates if EOF caused the lexicl error
090 * curLexState : lexical state in which this error occured
091 * errorLine : line number when the error occured
092 * errorColumn : column number when the error occured
093 * errorAfter : prefix that was seen before this error occured
094 * curchar : the offending character
095 * Note: You can customize the lexical error message by modifying this method.
096 */
097 protected static String LexicalError(boolean EOFSeen, int lexState, int errorLine, int errorColumn, String errorAfter, char curChar) {
098 return("Lexical error at line " +
099 errorLine + ", column " +
100 errorColumn + ". Encountered: " +
101 (EOFSeen ? "<EOF> " : ("\"" + addEscapes(String.valueOf(curChar)) + "\"") + " (" + (int)curChar + "), ") +
102 "after : \"" + addEscapes(errorAfter) + "\"");
103 }
104
105 /**
106 * You can also modify the body of this method to customize your error messages.
107 * For example, cases like LOOP_DETECTED and INVALID_LEXICAL_STATE are not
108 * of end-users concern, so you can return something like :
109 *
110 * "Internal Error : Please file a bug report .... "
111 *
112 * from this method for such cases in the release version of your parser.
113 */
114 public String getMessage() {
115 return super.getMessage();
116 }
117
118 /*
119 * Constructors of various flavors follow.
120 */
121
122 public TokenMgrError() {
123 }
124
125 public TokenMgrError(String message, int reason) {
126 super(message);
127 errorCode = reason;
128 }
129
130 public TokenMgrError(boolean EOFSeen, int lexState, int errorLine, int errorColumn, String errorAfter, char curChar, int reason) {
131 this(LexicalError(EOFSeen, lexState, errorLine, errorColumn, errorAfter, curChar), reason);
132 }
133 }