TokenMgrError.java example

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/* Generated By:JavaCC: Do not edit this line. TokenMgrError.java Version 3.0 */
/*
 Copyright (c) 1998-2005 The Regents of the University of California.
 All rights reserved.
 Permission is hereby granted, without written agreement and without
 license or royalty fees, to use, copy, modify, and distribute this
 software and its documentation for any purpose, provided that the above
 copyright notice and the following two paragraphs appear in all copies
 of this software.

 IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
 FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
 ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
 THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF
 SUCH DAMAGE.

 THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE
 PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF
 CALIFORNIA HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
 ENHANCEMENTS, OR MODIFICATIONS.

 PT_COPYRIGHT_VERSION_2
 COPYRIGHTENDKEY

 @ProposedRating Yellow (nsmyth)
 @AcceptedRating Yellow (yuhong)

 Created : May 1998

 */
package ptolemy.data.expr;

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.
     */
    protected static 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);
    }
}