expression_parser.cpp

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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.
 */
#include "func_sketch/parser/expression_parser.h"
 
#include <memory>
 
#include <boost/variant.hpp>
 
#include "func_sketch/math/generate_math_function_list.h"
#include "func_sketch/math/math_function_list.h"
#include "func_sketch/parser/convert_expression.h"
#include "func_sketch/parser/expression_grammar.h"
 
namespace func_sketch::parser {

struct ExpressionParser::Impl {
    ExpressionGrammar grammar;

    math::MathFunctionList math_function_list{
        math::generate_math_function_list()};

    math::ConstantList constant_list{math::generate_constant_list()};
};
 
ExpressionParser::ExpressionParser() : pimpl_(std::make_unique<Impl>()) {}
 
ExpressionParser::ExpressionParser(
    ExpressionParser&& /*other*/) noexcept = default;
 
ExpressionParser& ExpressionParser::operator=(
    ExpressionParser&& /*other*/) noexcept = default;
 
ExpressionParser::~ExpressionParser() = default;
 
expressions::ExpressionPtr ExpressionParser::operator()(
    const std::string& expression_str) const {
    const auto parsed_expression = pimpl_->grammar.parse(expression_str);
    return convert_expression(
        parsed_expression, pimpl_->math_function_list, pimpl_->constant_list);
}
 
}  // namespace func_sketch::parser