PreClassLevelMaxParser.java

/*
 * PreClassLevelMaxParser.java
 *
 * Copyright 2003 (C) Chris Ward <frugal@purplewombat.co.uk>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * Created on 18-Dec-2003
 *
 * Current Ver: $Revision$
 *
 *
 *
 */
package plugin.pretokens.parser;

import pcgen.core.prereq.Prerequisite;
import pcgen.core.prereq.PrerequisiteOperator;
import pcgen.persistence.PersistenceLayerException;
import pcgen.persistence.lst.prereq.AbstractPrerequisiteListParser;
import pcgen.persistence.lst.prereq.PrerequisiteParserInterface;

/**
 * A prerequisite parser class that handles the parsing of pre class level max tokens.
 *
 */
public class PreClassLevelMaxParser extends AbstractPrerequisiteListParser
		implements PrerequisiteParserInterface
{
	/**
	 * Get the type of prerequisite handled by this token.
	 * @return the type of prerequisite handled by this token.
	 */
    @Override
	public String[] kindsHandled()
	{
		return new String[]{"CLASSLEVELMAX"};
	}

	/**
	 * Parse the pre req list
	 *
	 * @param kind The kind of the prerequisite (less the "PRE" prefix)
	 * @param formula The body of the prerequisite.
	 * @param invertResult Whether the prerequisite should invert the result.
	 * @param overrideQualify
	 *           if set true, this prerequisite will be enforced in spite
	 *           of any "QUALIFY" tag that may be present.
	 * @return PreReq
	 * @throws PersistenceLayerException
	 */
	@Override
	public Prerequisite parse(String kind,
	                          String formula,
	                          boolean invertResult,
	                          boolean overrideQualify) throws PersistenceLayerException
	{
		Prerequisite prereq = super.parse(kind, formula, invertResult, overrideQualify);

	// ClassLevelMax is basically the inverse of class
	//
	// PRECLASSLEVELMAX:Barbarian=1			!PRECLASS:Barbarian=2
	// !PRECLASSLEVELMAX:Barbarian=1		PRECLASS:Barbarian=2
	// PRECLASSLEVELMAX:Fighter=1,SPELLCASTER=2	PREMULT:2,[!PRECLASS:Fighter=2],[!PRECLASS:SPELLCASTER=3]
	// PRECLASSLEVELMAX:Fighter,SPELLCASTER=2	PREMULT:2,[!PRECLASS:Fighter=3],[!PRECLASS:SPELLCASTER=3]
	//

		changeFromLevelMax(prereq);
		if (invertResult)
		{
			prereq.setOperator(prereq.getOperator().invert());
		}

		return prereq;
	}

	//
	// Change all occurrences of PRECLASSLEVELMAX to PRECLASS
	//
	private static void changeFromLevelMax(Prerequisite p)
	{
		for (Prerequisite subreq : p.getPrerequisites())
		{
			changeFromLevelMax(subreq);
		}

		if (p.getKind() == null) // PREMULT
		{
			// Nothing to do. This is a PREMULT and we don't care about them.
		}
		else if ("classlevelmax".equals(p.getKind()))
		{
			p.setKind("class");
			//
			// PRECLASS is GTEQ, so need to change operator to LT and then add 1 to the operand
			// which results in the of negation of the PRECLASS
			// 'class_levels >= 4'   --> 'class_levels < 5'
			//

			//
			// If the entry after the '=' is non-numeric AbstractPrerequisiteListParser#parse will
			// have placed the entire entry into the key. We need to separate the key from the
			// operand.
			//
			String oper = p.getKey();
			int idxEquals = oper.indexOf('=');
			if (idxEquals >= 0)
			{
				p.setKey(oper.substring(0, idxEquals));
				oper = oper.substring(idxEquals + 1);
			}
			else
			{
				oper = p.getOperand();
			}

			try
			{
				oper = Integer.toString(Integer.parseInt(oper) + 1);
			}
			catch (NumberFormatException nfe)
			{
				oper = "(" + oper + ")+1";
			}
			p.setOperand(oper);
			p.setOperator(PrerequisiteOperator.LT);
			p.setCountMultiples(false);
		}
	}

}