/* Generated By:JavaCC: Do not edit this line. TokenMgrError.java Version 0.7pre2 */

/*
 * Cobertura - http://cobertura.sourceforge.net/
 *
 * This file was taken from JavaNCSS
 * http://www.kclee.com/clemens/java/javancss/
 * Copyright (C) 2000 Chr. Clemens Lee <clemens a.t kclee d.o.t com>
 *
 * Cobertura is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published
 * by the Free Software Foundation; either version 2 of the License,
 * or (at your option) any later version.
 *
 * Cobertura is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Cobertura; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
 */

package net.sourceforge.cobertura.javancss;

class TokenMgrError extends Error
{

	private static final long serialVersionUID = 0L;

	/*
	 * 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
	 */
	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 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.
	 */

	TokenMgrError()
	{
	}

	TokenMgrError(String message, int reason)
	{
		super(message);
		errorCode = reason;
	}

	TokenMgrError(boolean EOFSeen, int errorLine, int errorColumn, String errorAfter, char curChar,
			int reason)
	{
		this(LexicalError(EOFSeen, errorLine, errorColumn, errorAfter, curChar), reason);
	}
}