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Redberry is an open source computer algebra system designed for tensor manipulation. It implements basic computer algebra system routines as well as complex tools for real computations in physics. This module contains the implementation of special routines needed in real physical problems. It contains tools for such problems like Feynman graphs and one-loop counterterms calculation etc.

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/*
 * 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.physics.feyncalc;

import cc.redberry.core.context.OutputFormat;
import cc.redberry.core.tensor.Product;
import cc.redberry.core.tensor.SimpleTensor;
import cc.redberry.core.tensor.Tensor;
import cc.redberry.core.transformations.options.Creator;
import cc.redberry.core.transformations.options.Options;
import cc.redberry.core.transformations.substitutions.SubstitutionIterator;

/**
 * @author Dmitry Bolotin
 * @author Stanislav Poslavsky
 */
public final class DiracSimplifyTransformation extends AbstractTransformationWithGammas {
    private final SimplifyGamma5Transformation simplify5;
    private final DiracSimplify0 ds0;
    private final DiracSimplify1 ds1;

    @Creator
    public DiracSimplifyTransformation(@Options DiracOptions options) {
        super(options);
        this.simplify5 = new SimplifyGamma5Transformation(options);
        this.ds0 = new DiracSimplify0(options);
        this.ds1 = new DiracSimplify1(options);
    }

    @Override
    public Tensor transform(Tensor tensor) {
        SubstitutionIterator iterator = new SubstitutionIterator(tensor);
        Tensor original;
        out:
        while ((original = iterator.next()) != null) {
            if (!(original instanceof Product))
                continue;
            if (original.getIndices().size(matrixType) == 0)
                continue;
            if (!containsGammaOr5Matrices(original))
                continue;

            original = simplify5.transform(original);
            original = ds0.transform(original);
            original = ds1.transform(original);
            iterator.safeSet(original);
        }
        return iterator.result();
    }

    @Override
    public String toString(OutputFormat outputFormat) {
        return "DiracSimplify";
    }
}