/*

  This file is part of solidity.

  solidity 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.

  solidity 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 solidity.  If not, see <http://www.gnu.org/licenses/>.

*/

// SPDX-License-Identifier: GPL-3.0

#include <libyul/optimiser/ForLoopInitRewriter.h>

#include <libyul/AST.h>

#include <libsolutil/CommonData.h>

#include <functional>

using namespace solidity;

using namespace solidity::yul;

void ForLoopInitRewriter::operator()(Block& _block)

{

  util::iterateReplacing(

    _block.statements,

    [&](Statement& _stmt) -> std::optional<std::vector<Statement>>

    {

      if (std::holds_alternative<ForLoop>(_stmt))

      {

        auto& forLoop = std::get<ForLoop>(_stmt);

        (*this)(forLoop.pre);

        (*this)(forLoop.body);

        (*this)(forLoop.post);

        std::vector<Statement> rewrite;

        swap(rewrite, forLoop.pre.statements);

        rewrite.emplace_back(std::move(forLoop));

        return { std::move(rewrite) };

      }

      else

      {

        visit(_stmt);

        return {};

      }

    }

  );

}