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Functions for converting strings from and to various formats, such as roman numbers, alpha indices, Java identifiers, and format strings.

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package org.cthul.strings.format.pattern;

import java.math.BigInteger;
import java.util.Locale;
import java.util.regex.Matcher;
import org.cthul.strings.format.PatternAPI;

/**
 *
 * @author Arian Treffer
 */
public class DecimalValue extends PatternAlignmentBase {

    @Override
    protected boolean matchExactWidth(String flags, int width) {
        return width < 6;
    }
    
    @Override
    protected int toRegex(PatternAPI pattern, Locale locale, String flags, char padding, int precision, String formatString, int position) {
        pattern.addedCapturingGroup();
        pattern.append("([-+]?[0-9]+)");
        return 0;
    }

    @Override
    protected int toRegex(PatternAPI pattern, Locale locale, String flags, char padding, int width, int precision, String formatString, int position) {
        if (width < 0) {
            return toRegex(pattern, locale, flags, padding, width, precision, formatString, position);
        }
        pattern.addedCapturingGroup();
        pattern.append("([0-9]{"+width+"}|[-+][0-9]{"+(width-1)+"})");
        return 0;
    }

    @Override
    protected Object parse(Matcher matcher, int capturingBase, int width, Object memento, Object lastArgValue) {
        BigInteger bi = new BigInteger(matcher.group(capturingBase));
        int len = bi.bitLength();
        if (len <= 32) {
            return bi.intValue();
        }
        if (len <= 64) {
            return bi.longValue();
        }
        return bi;
    }
    
}