TokenMgrError.java

/* Generated By:JavaCC: Do not edit this line. TokenMgrError.java Version 3.0 */
/***********************************************************************************************************************
 * Copyright (c) Jonas Bon�r, Alexandre Vasseur. All rights reserved. * http://aspectwerkz.codehaus.org *
 * ---------------------------------------------------------------------------------- * The software in this package is
 * published under the terms of the LGPL license * a copy of which has been included with this distribution in the
 * license.txt file. *
 **********************************************************************************************************************/
package org.codehaus.aspectwerkz.expression.ast;

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);
    }
}