parseexception.java

java覆盖率测试工具

/* Generated By:JavaCC: Do not edit this line. ParseException.java Version 0.7pre6 */

/*
 * 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;

/**
 * This exception is thrown when parse errors are encountered.
 * You can explicitly create objects of this exception type by
 * calling the method generateParseException in the generated
 * parser.
 *
 * You can modify this class to customize your error reporting
 * mechanisms so long as you retain the public fields.
 */
class ParseException extends Exception
{

	private static final long serialVersionUID = 0L;

	/**
	 * This constructor is used by the method "generateParseException"
	 * in the generated parser.  Calling this constructor generates
	 * a new object of this type with the fields "currentToken",
	 * "expectedTokenSequences", and "tokenImage" set.  The boolean
	 * flag "specialConstructor" is also set to true to indicate that
	 * this constructor was used to create this object.
	 * This constructor calls its super class with the empty string
	 * to force the "toString" method of parent class "Throwable" to
	 * print the error message in the form:
	 *     ParseException: <result of getMessage>
	 */
	public ParseException(Token currentTokenVal, int[][] expectedTokenSequencesVal,
			String[] tokenImageVal)
	{
		super("");
		specialConstructor = true;
		currentToken = currentTokenVal;
		expectedTokenSequences = expectedTokenSequencesVal;
		tokenImage = tokenImageVal;
	}

	/**
	 * The following constructors are for use by you for whatever
	 * purpose you can think of.  Constructing the exception in this
	 * manner makes the exception behave in the normal way - i.e., as
	 * documented in the class "Throwable".  The fields "errorToken",
	 * "expectedTokenSequences", and "tokenImage" do not contain
	 * relevant information.  The JavaCC generated code does not use
	 * these constructors.
	 */

	public ParseException()
	{
		super();
		specialConstructor = false;
	}

	public ParseException(String message)
	{
		super(message);
		specialConstructor = false;
	}

	/**
	 * This variable determines which constructor was used to create
	 * this object and thereby affects the semantics of the
	 * "getMessage" method (see below).
	 */
	protected boolean specialConstructor;

	/**
	 * This is the last token that has been consumed successfully.  If
	 * this object has been created due to a parse error, the token
	 * followng this token will (therefore) be the first error token.
	 */
	public Token currentToken;

	/**
	 * Each entry in this array is an array of integers.  Each array
	 * of integers represents a sequence of tokens (by their ordinal
	 * values) that is expected at this point of the parse.
	 */
	public int[][] expectedTokenSequences;

	/**
	 * This is a reference to the "tokenImage" array of the generated
	 * parser within which the parse error occurred.  This array is
	 * defined in the generated ...Constants interface.
	 */
	public String[] tokenImage;

	/**
	 * This method has the standard behavior when this object has been
	 * created using the standard constructors.  Otherwise, it uses
	 * "currentToken" and "expectedTokenSequences" to generate a parse
	 * error message and returns it.  If this object has been created
	 * due to a parse error, and you do not catch it (it gets thrown
	 * from the parser), then this method is called during the printing
	 * of the final stack trace, and hence the correct error message
	 * gets displayed.
	 */
	public String getMessage()
	{
		if (!specialConstructor)
		{
			return super.getMessage();
		}
		String expected = "";
		int maxSize = 0;
		for (int i = 0; i < expectedTokenSequences.length; i++)
		{
			if (maxSize < expectedTokenSequences[i].length)
			{
				maxSize = expectedTokenSequences[i].length;
			}
			for (int j = 0; j < expectedTokenSequences[i].length; j++)
			{
				expected += tokenImage[expectedTokenSequences[i][j]] + " ";
			}
			if (expectedTokenSequences[i][expectedTokenSequences[i].length - 1] != 0)
			{
				expected += "...";
			}
			expected += eol + "    ";
		}
		String retval = "Encountered \"";
		Token tok = currentToken.next;
		for (int i = 0; i < maxSize; i++)
		{
			if (i != 0)
				retval += " ";
			if (tok.kind == 0)
			{
				retval += tokenImage[0];
				break;
			}
			retval += add_escapes(tok.image);
			tok = tok.next;
		}
		retval += "\" at line " + currentToken.next.beginLine + ", column "
				+ currentToken.next.beginColumn + "." + eol;
		if (expectedTokenSequences.length == 1)
		{
			retval += "Was expecting:" + eol + "    ";
		}
		else
		{
			retval += "Was expecting one of:" + eol + "    ";
		}
		retval += expected;
		return retval;
	}

	/**
	 * The end of line string for this machine.
	 */
	protected String eol = System.getProperty("line.separator", "\n");

	/**
	 * Used to convert raw characters to their escaped version
	 * when these raw version cannot be used as part of an ASCII
	 * string literal.
	 */
	protected String add_escapes(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();
	}

}