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authorautocommitter <autocommitter@linux-forks.de>2024-04-22 14:56:46 +0200
committerautocommitter <autocommitter@linux-forks.de>2024-04-22 14:56:46 +0200
commit54c24cab74408480948af9a6ade4f4ab1aac51b1 (patch)
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/*
Minetest
Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

This program 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 this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#pragma once

#include "irrlichttypes_bloated.h"
#include "util/string.h"
#include <string>
#include <list>
#include <set>
#include <mutex>

class Settings;
struct NoiseParams;

// Global objects
extern Settings *g_settings;
extern std::string g_settings_path;

// Type for a settings changed callback function
typedef void (*SettingsChangedCallback)(const std::string &name, void *data);

typedef std::vector<
	std::pair<
		SettingsChangedCallback,
		void *
	>
> SettingsCallbackList;

typedef std::unordered_map<std::string, SettingsCallbackList> SettingsCallbackMap;

enum ValueType {
	VALUETYPE_STRING,
	VALUETYPE_FLAG // Doesn't take any arguments
};

enum SettingsParseEvent {
	SPE_NONE,
	SPE_INVALID,
	SPE_COMMENT,
	SPE_KVPAIR,
	SPE_END,
	SPE_GROUP,
	SPE_MULTILINE,
};

struct ValueSpec {
	ValueSpec(ValueType a_type, const char *a_help=NULL)
	{
		type = a_type;
		help = a_help;
	}

	ValueType type;
	const char *help;
};

struct SettingsEntry {
	SettingsEntry() = default;

	SettingsEntry(const std::string &value_) :
		value(value_)
	{}

	SettingsEntry(Settings *group_) :
		group(group_),
		is_group(true)
	{}

	std::string value = "";
	Settings *group = nullptr;
	bool is_group = false;
};

typedef std::unordered_map<std::string, SettingsEntry> SettingEntries;

class Settings {
public:
	Settings() = default;

	~Settings();

	Settings & operator += (const Settings &other);
	Settings & operator = (const Settings &other);

	/***********************
	 * Reading and writing *
	 ***********************/

	// Read configuration file.  Returns success.
	bool readConfigFile(const char *filename);
	//Updates configuration file.  Returns success.
	bool updateConfigFile(const char *filename);
	// NOTE: Types of allowed_options are ignored.  Returns success.
	bool parseCommandLine(int argc, char *argv[],
			std::map<std::string, ValueSpec> &allowed_options);
	bool parseConfigLines(std::istream &is, const std::string &end = "");
	void writeLines(std::ostream &os, u32 tab_depth=0) const;

	SettingsParseEvent parseConfigObject(const std::string &line,
		const std::string &end, std::string &name, std::string &value);
	bool updateConfigObject(std::istream &is, std::ostream &os,
		const std::string &end, u32 tab_depth=0);

	static bool checkNameValid(const std::string &name);
	static bool checkValueValid(const std::string &value);