/*
* PreVariableParser.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 19-Dec-2003
*
* Current Ver: $Revision$
*
*
*
*/
package plugin.pretokens.parser;
import pcgen.base.text.ParsingSeparator;
import pcgen.core.prereq.Prerequisite;
import pcgen.core.prereq.PrerequisiteException;
import pcgen.persistence.PersistenceLayerException;
import pcgen.persistence.lst.prereq.AbstractPrerequisiteParser;
import pcgen.persistence.lst.prereq.PrerequisiteParserInterface;
/**
* A prerequisite parser class that handles the parsing of pre variable tokens.
*
*/
public class PreVariableParser extends AbstractPrerequisiteParser 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[]{"VAR", "VAREQ", "VARLTEQ", "VARLT", "VARNEQ",
"VARGT", "VARGTEQ"};
}
/**
* 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);
prereq.setKind("var");
// Get the comparator type SIZEGTEQ, BSIZE, SIZENEQ etc.
String compType = kind.substring(3);
if (compType.isEmpty())
{
compType = "gteq";
}
ParsingSeparator ps = new ParsingSeparator(formula, ',');
ps.addGroupingPair('[', ']');
ps.addGroupingPair('(', ')');
try
{
int count = 0;
while (ps.hasNext())
{
String first = ps.next();
if (!ps.hasNext())
{
throw new PersistenceLayerException(
"Unable to parse prerequisite 'PRE" + kind + ":" + formula
+ "'. Incorrect parameter count (must be even)");
}
String second = ps.next();
Prerequisite subreq;
if (!ps.hasNext() && count == 0)
{
subreq = prereq;
}
else
{
prereq.setKind(null); // PREMULT
subreq = new Prerequisite();
subreq.setKind("var");
prereq.addPrerequisite(subreq);
count++;
}
subreq.setOperator(compType.intern());
subreq.setKey(first.intern());
subreq.setOperand(second.intern());
}
if (count > 0)
{
prereq.setOperand(Integer.toString(count));
}
}
catch (PrerequisiteException pe)
{
throw new PersistenceLayerException(
"Unable to parse prerequisite 'PRE" + kind + ":" + formula
+ "'. " + pe.getLocalizedMessage());
}
if (invertResult)
{
prereq.setOperator(prereq.getOperator().invert());
}
prereq.setOverrideQualify(overrideQualify);
return prereq;
}
}