Config.cpp

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/*
 * Copyright (C) 2019-2021 Tobias Flaig.
 *
 * This file is part of nawa.
 *
 * nawa is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License,
 * version 3, as published by the Free Software Foundation.
 *
 * nawa 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with nawa.  If not, see <https://www.gnu.org/licenses/>.
 */
 
#include <boost/functional/hash.hpp>
#include <inih/ini.h>
#include <nawa/Exception.h>
#include <nawa/config/Config.h>
#include <unordered_map>
 
using namespace nawa;
using namespace std;
 
// implementation
struct Config::Data {
    std::unordered_map<std::pair<std::string, std::string>, std::string, boost::hash<std::pair<std::string, std::string>>> values;
};
 
NAWA_DEFAULT_DESTRUCTOR_IMPL(Config)
 
NAWA_COPY_CONSTRUCTOR_IMPL(Config)
 
NAWA_COPY_ASSIGNMENT_OPERATOR_IMPL(Config)
 
NAWA_MOVE_CONSTRUCTOR_IMPL(Config)
 
NAWA_MOVE_ASSIGNMENT_OPERATOR_IMPL(Config)
 
NAWA_DEFAULT_CONSTRUCTOR_IMPL(Config)
 
Config::Config(initializer_list<pair<pair<string, string>, string>> init) : Config() {
    data->values.insert(init.begin(), init.end());
}
 
Config::Config(string const& iniFile) : Config() {
    read(iniFile);
}
 
void Config::read(string const& iniFile) {
    auto valueHandler = [](void* obj, char const* section, char const* name, char const* value) -> int {
        auto _this = (Config*) obj;
        pair<string, string> keyToInsert(section, name);
        pair<pair<string, string>, string> pairToInsert(keyToInsert, value);
        _this->data->values.insert(pairToInsert);
        return 1;
    };
    if (ini_parse(iniFile.c_str(), valueHandler, this) < 0) {
        throw Exception(__PRETTY_FUNCTION__, 1, "Could not read config file.");
    }
}
 
void Config::insert(std::initializer_list<std::pair<std::pair<std::string, std::string>, std::string>> init) {
    data->values.insert(init.begin(), init.end());
}
 
void Config::override(std::vector<std::pair<std::pair<std::string, std::string>, std::string>> const& overrides) {
    for (auto& [k, v] : overrides) {
        data->values[k] = v;
    }
}
 
bool Config::isSet(pair<string, string> const& key) const {
    return (data->values.count(key) == 1);
}
 
string Config::operator[](pair<string, string> const& key) const {
    if (data->values.count(key) == 1) {
        return data->values.at(key);
    } else {
        return {};
    }
}
 
// doxygen bug requires std:: here
void Config::set(std::pair<string, string> key, std::string value) {
    data->values[move(key)] = move(value);
}
 
void Config::set(string section, string key, string value) {
    set(pair<string, string>(move(section), move(key)), move(value));
}