Package cc.redberry.core.number.parser

Source Code of cc.redberry.core.number.parser.RealToken

/*
* 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.Numeric;
import cc.redberry.core.number.Rational;
import cc.redberry.core.number.Real;

import java.math.BigInteger;

/**
* @author Stanislav Poslavsky
*/
public class RealToken implements TokenParser<Real> {

    public static final RealToken INSTANCE = new RealToken();

    private RealToken() {
    }

    @Override
    public Real parse(String expression, NumberParser<Real> parser) {
        try {
            return new Rational(new BigInteger(expression));
        } catch (NumberFormatException exception) {
        }
        try {
            return new Numeric(Double.parseDouble(expression));
        } catch (NumberFormatException exception) {
            return null;
        }
    }
}
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