SectionRegistry.hpp

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// SPDX-License-Identifier: Apache-2.0
//
// Copyright 2026 Caleb Buahin
//
// 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.

 
#ifndef OPENSWMM_ENGINE_SECTION_REGISTRY_HPP
#define OPENSWMM_ENGINE_SECTION_REGISTRY_HPP
 
#include <string>
#include <string_view>
#include <vector>
#include <functional>
#include <unordered_map>
 
namespace openswmm {
    struct SimulationContext;
}
 
namespace openswmm::input {

using SectionHandler = std::function<void(
    SimulationContext&,
    const std::vector<std::string>& /*lines*/
)>;

class SectionRegistry {
public:
    SectionRegistry() = default;
    ~SectionRegistry() = default;
 
    // -----------------------------------------------------------------------
    // Registration
    // -----------------------------------------------------------------------

    void register_builtin(std::string_view tag, SectionHandler handler);

    void register_custom(std::string_view tag, SectionHandler handler);
 
    // -----------------------------------------------------------------------
    // Query
    // -----------------------------------------------------------------------

    bool has(std::string_view tag) const;

    bool is_custom(std::string_view tag) const;
 
    // -----------------------------------------------------------------------
    // Dispatch
    // -----------------------------------------------------------------------

    void dispatch(
        std::string_view                  tag,
        SimulationContext&                ctx,
        const std::vector<std::string>&   lines
    ) const;
 
    // -----------------------------------------------------------------------
    // Enumeration
    // -----------------------------------------------------------------------

    std::vector<std::string> registered_tags() const;
 
private:
    std::unordered_map<std::string, SectionHandler> builtin_;
    std::unordered_map<std::string, SectionHandler> custom_;
 
    std::string normalize_tag(std::string_view tag) const;
};
 
} /* namespace openswmm::input */
 
#endif /* OPENSWMM_ENGINE_SECTION_REGISTRY_HPP */