diff options
author | Sven Gothel <[email protected]> | 2000-11-18 06:43:49 +0000 |
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committer | Sven Gothel <[email protected]> | 2000-11-18 06:43:49 +0000 |
commit | 880653d31a8f1ff8384fdbc75b84934bceecfdb8 (patch) | |
tree | bdafb71416f176d2a4b73bf716c9dc3f13685a8b /C2J/TokenMgrError.java |
Initial revision
Diffstat (limited to 'C2J/TokenMgrError.java')
-rw-r--r-- | C2J/TokenMgrError.java | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/C2J/TokenMgrError.java b/C2J/TokenMgrError.java new file mode 100644 index 0000000..e967e4d --- /dev/null +++ b/C2J/TokenMgrError.java @@ -0,0 +1,131 @@ +/* Generated By:JavaCC: Do not edit this line. TokenMgrError.java Version 0.7pre2 */ +public class TokenMgrError extends Error +{ + /* + * Ordinals for various reasons why an Error of this type can be thrown. + */ + + /** + * Lexical error occured. + */ + static final int LEXICAL_ERROR = 0; + + /** + * An attempt wass made to create a second instance of a static token manager. + */ + static final int STATIC_LEXER_ERROR = 1; + + /** + * Tried to change to an invalid lexical state. + */ + static final int INVALID_LEXICAL_STATE = 2; + + /** + * Detected (and bailed out of) an infinite loop in the token manager. + */ + static final int LOOP_DETECTED = 3; + + /** + * Indicates the reason why the exception is thrown. It will have + * one of the above 4 values. + */ + int errorCode; + + /** + * Replaces unprintable characters by their espaced (or unicode escaped) + * equivalents in the given string + */ + protected static final String addEscapes(String str) { + StringBuffer retval = new StringBuffer(); + char ch; + for (int i = 0; i < str.length(); i++) { + switch (str.charAt(i)) + { + case 0 : + continue; + case '\b': + retval.append("\\b"); + continue; + case '\t': + retval.append("\\t"); + continue; + case '\n': + retval.append("\\n"); + continue; + case '\f': + retval.append("\\f"); + continue; + case '\r': + retval.append("\\r"); + continue; + case '\"': + retval.append("\\\""); + continue; + case '\'': + retval.append("\\\'"); + continue; + case '\\': + retval.append("\\\\"); + continue; + default: + if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) { + String s = "0000" + Integer.toString(ch, 16); + retval.append("\\u" + s.substring(s.length() - 4, s.length())); + } else { + retval.append(ch); + } + continue; + } + } + return retval.toString(); + } + + /** + * Returns a detailed message for the Error when it is thrown by the + * token manager to indicate a lexical error. + * Parameters : + * EOFSeen : indicates if EOF caused the lexicl error + * curLexState : lexical state in which this error occured + * errorLine : line number when the error occured + * errorColumn : column number when the error occured + * errorAfter : prefix that was seen before this error occured + * curchar : the offending character + * Note: You can customize the lexical error message by modifying this method. + */ + private static final String LexicalError(boolean EOFSeen, int lexState, int errorLine, int errorColumn, String errorAfter, char curChar) { + return("Lexical error at line " + + errorLine + ", column " + + errorColumn + ". Encountered: " + + (EOFSeen ? "<EOF> " : ("\"" + addEscapes(String.valueOf(curChar)) + "\"") + " (" + (int)curChar + "), ") + + "after : \"" + addEscapes(errorAfter) + "\""); + } + + /** + * You can also modify the body of this method to customize your error messages. + * For example, cases like LOOP_DETECTED and INVALID_LEXICAL_STATE are not + * of end-users concern, so you can return something like : + * + * "Internal Error : Please file a bug report .... " + * + * from this method for such cases in the release version of your parser. + */ + public String getMessage() { + return super.getMessage(); + } + + /* + * Constructors of various flavors follow. + */ + + public TokenMgrError() { + } + + public TokenMgrError(String message, int reason) { + super(message); + errorCode = reason; + } + + public TokenMgrError(boolean EOFSeen, int lexState, int errorLine, int errorColumn, String errorAfter, char curChar, int reason) { + this(LexicalError(EOFSeen, lexState, errorLine, errorColumn, errorAfter, curChar), reason); + } +} |