/*
 * Redberry: symbolic tensor computations.
 *
 * Copyright (c) 2010-2015:
 *   Stanislav Poslavsky   
 *   Bolotin Dmitriy       
 *
 * 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 .
 */
package cc.redberry.core.parser;

import cc.redberry.core.number.Complex;
import cc.redberry.core.number.parser.NumberParser;

/**
 * Parser for numbers.
 *
 * @author Dmitry Bolotin
 * @author Stanislav Poslavsky
 * @since 1.0
 */
public class ParserNumber implements TokenParser {
    /**
     * Singleton instance.
     */
    public static final ParserNumber INSTANCE = new ParserNumber();

    private ParserNumber() {
    }

    @Override
    public ParseToken parseToken(String expression, cc.redberry.core.parser.Parser parser) {
        Complex value;
        try {
            value = NumberParser.COMPLEX_PARSER.parse(expression);
        } catch (NumberFormatException e) {
            return null;
        }
        return new ParseTokenNumber(value);
    }

    @Override
    public int priority() {
        return 9999;
    }
}