jscl.text.UnsignedFactor Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of jscl Show documentation

There is a newer version: 1.0.11

package jscl.text;

import jscl.math.Generic;
import jscl.math.GenericVariable;
import jscl.math.JsclInteger;
import jscl.math.NotIntegerException;
import jscl.math.function.Pow;

import javax.annotation.Nonnull;
import java.util.ArrayList;
import java.util.List;
import java.util.ListIterator;

/**
 * User: serso
 * Date: 10/27/11
 * Time: 2:45 PM
 */
class UnsignedFactor implements Parser {
	public static final Parser parser = new UnsignedFactor();

	private UnsignedFactor() {
	}

	public Object parse(@Nonnull Parameters p, Generic previousSumElement) throws ParseException {
		final List list = new ArrayList();

		Generic generic = UnsignedExponent.parser.parse(p, previousSumElement);

		list.add(generic);

		while (true) {
			try {
				list.add(PowerExponentParser.parser.parse(p, null));
			} catch (ParseException e) {
				break;
			}
		}

		final ListIterator it = list.listIterator(list.size());
		generic = it.previous();
		while (it.hasPrevious()) {
			Generic b = it.previous();
			try {
				int c = generic.integerValue().intValue();
				if (c < 0) {
					generic = new Pow(GenericVariable.content(b, true), JsclInteger.valueOf(c)).expressionValue();
				} else {
					generic = b.pow(c);
				}
			} catch (NotIntegerException e) {
				generic = new Pow(GenericVariable.content(b, true), GenericVariable.content(generic, true)).expressionValue();
			}
		}

		return generic;
	}
}