expression_parser.h

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/*
 * Copyright 2026 MusicScience37 (Kenta Kabashima)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#pragma once
 
#include <memory>
#include <string>
 
#include "func_sketch/expressions/expression_ptr.h"
 
namespace func_sketch::parser {

class ExpressionParser {
public:
    ExpressionParser();
 
    ExpressionParser(const ExpressionParser&) = delete;
    ExpressionParser& operator=(const ExpressionParser&) = delete;

    ExpressionParser(ExpressionParser&& /*other*/) noexcept;

    ExpressionParser& operator=(ExpressionParser&& /*other*/) noexcept;

    ~ExpressionParser();

    [[nodiscard]] expressions::ExpressionPtr operator()(
        const std::string& expression_str) const;
 
private:
    // Separate implementation to avoid including Boost.Spirit headers in this
    // header file for faster compilation.

    struct Impl;

    std::unique_ptr<Impl> pimpl_;
};
 
}  // namespace func_sketch::parser