/*
* Redberry: symbolic tensor computations.
*
* Copyright (c) 2010-2012:
* 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.parser;
import cc.redberry.core.tensor.Expression;
import cc.redberry.core.tensor.Tensor;
public class ParserExpression implements TensorParser {
public static final ParserExpression INSTANCE = new ParserExpression();
private ParserExpression() {
}
@Override
public Tensor parse(String expression, Parser parser) {
if (!expression.contains("="))
return null;
if (expression.indexOf('=') != expression.lastIndexOf('='))
throw new ParserException("Several '=' symbols.");
String[] parts = expression.split("=");
Tensor t0 = parser.parse(parts[0]);
Tensor t1 = parser.parse(parts[1]);
return new Expression(t0, t1);
}
@Override
public int getPriority() {
return 10100;
}
}