/*
* Redberry: symbolic tensor computations.
*
* Copyright (c) 2010-2013:
* Stanislav Poslavsky <stvlpos@mail.ru>
* Bolotin Dmitriy <bolotin.dmitriy@gmail.com>
*
* This file is part of Redberry.
*
* Redberry is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Redberry 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Redberry. If not, see <http://www.gnu.org/licenses/>.
*/
package cc.redberry.core.number.parser;
import cc.redberry.core.number.Complex;
import java.math.BigInteger;
/**
* @author Stanislav Poslavsky
*/
public class ComplexToken implements TokenParser<Complex> {
public static final ComplexToken INSTANCE = new ComplexToken();
private ComplexToken() {
}
@Override
public Complex parse(String expression, NumberParser<Complex> parser) {
if (expression.equals("I"))
return Complex.IMAGE_ONE;
try {
return new Complex(new BigInteger(expression));
} catch (NumberFormatException ignored) {
}
try {
return new Complex(Double.parseDouble(expression));
} catch (NumberFormatException exception) {
return null;
}
}
}