TermUtilities.java

/**
 * pcgen.util.TermUtilities.java
 * Copyright (c) 2008 Andrew Wilson <nuance@users.sourceforge.net>.
 *
 * 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 13 August 2008
 *
 * Current Ver: $Revision:$
 *
 */

package pcgen.util;

import java.util.regex.Pattern;

import pcgen.core.term.TermEvaulatorException;

public class TermUtilities {
	public static final String dString = "(?:NOT|ADD|IS)";
	public static final Pattern dPat = Pattern.compile(dString);
	public static final String sString = "(?:EQUIPPED|NOTEQUIPPED)";
	public static final Pattern sPat = Pattern.compile(sString);

	public static void checkEqTypeTypesArray(
			String originalText,
			String[] types, 
			int first) throws TermEvaulatorException
	{
		int cur = first + 1;

		while (cur < types.length)
		{
			// "(?:NOT|ADD|IS)"
			if (dPat.matcher(types[cur]).matches())
			{
				cur++;
				if (cur >= types.length)
				{
					StringBuilder sB = new StringBuilder();
					sB.append(types[cur-1]);
					sB.append(" must be followed by a type in ");
					sB.append(originalText);
					throw new TermEvaulatorException(sB.toString());
				}
				cur++;
			}
			// "(?:EQUIPPED|NOTEQUIPPED)"
			else if (sPat.matcher(types[cur]).matches() || 
					 "".equalsIgnoreCase(types[cur]))
			{
				cur++;
			}
			else
			{
				StringBuilder sB = new StringBuilder();
				sB.append("Spurious type \"");
				sB.append(types[cur]);
				sB.append("\" in ");
				sB.append(originalText);
				throw new TermEvaulatorException(sB.toString());
			}
		}
	}

	public static void checkEquipmentTypesArray(
			String originalText,
			String[] types, 
			int first) throws TermEvaulatorException
	{
		int cur = first;

		while (cur < types.length)
		{
			// "(?:NOT|ADD|IS)"			
			if (dPat.matcher(types[cur]).matches())
			{
				cur++;
				if (cur >= types.length)
				{
					StringBuilder sB = new StringBuilder();
					sB.append(types[cur-1]);
					sB.append(" must be followed by a type in ");
					sB.append(originalText);
					throw new TermEvaulatorException(sB.toString());
				}
				cur++;
			}
			else if ("".equalsIgnoreCase(types[cur]))
			{
				cur++;
			}
			else
			{
				StringBuilder sB = new StringBuilder();
				sB.append("Spurious type \"");
				sB.append(types[cur]);
				sB.append("\" in ");
				sB.append(originalText);
				throw new TermEvaulatorException(sB.toString());
			}
		}
	}

	public static String extractContentsOfBrackets(
			String expressionString,
			String src,
			int fixed) throws TermEvaulatorException
	{
		int expEnd = expressionString.lastIndexOf("]");

		if (expEnd != expressionString.length() - 1)
		{
			StringBuilder sB = new StringBuilder();
			sB.append("Badly formed formula ");
			sB.append(expressionString);
			if (!"".equals(src)) {
				sB.append(" in ");
				sB.append(src);
			}
			sB.append(" following \"");
			sB.append(expressionString.substring(0, fixed));
			throw new TermEvaulatorException(sB.toString());
		}

		// The string inside the brackets
		return expressionString.substring(fixed, expEnd);
	}

	public static int[] splitAndConvertIntegers(
			String expressionString,
			final String clause,
			int numOfFields) throws TermEvaulatorException
	{
		final String[] sA = clause.split("\\.", numOfFields);
		if (sA.length < numOfFields)
		{
			StringBuilder sB = new StringBuilder();
			sB.append("Invalid string ");
			sB.append(clause);
			sB.append(" following ");
			sB.append(expressionString);
			sB.append(" should be ");
			sB.append(numOfFields);
			sB.append(" integers separated by dots");
			throw new TermEvaulatorException(sB.toString());
		}

		int[] fields = new int[numOfFields];

		int index = 0;
		for (String field : clause.split("\\.", numOfFields))
		{
			fields[index++] = Integer.parseInt(field);
		}

		return fields;
	}

	public static int[] convertToIntegers(
			String expressionString,
			String intString,
			int fixed,
			int numToExtract) throws TermEvaulatorException
	{
		int[] nums;
		try
		{
			nums = splitAndConvertIntegers(
					expressionString,
					intString,
					numToExtract);
		}
		catch (NumberFormatException n)
		{
			StringBuilder sB = new StringBuilder();
			sB.append("Invalid string following ");
			sB.append(expressionString.substring(0, fixed));
			sB.append(" in ");
			sB.append(expressionString);
			throw new TermEvaulatorException(sB.toString());
		}
		return nums;
	}
}