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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.
*/

#ifndef SETTINGS_HEADER
#define SETTINGS_HEADER

#include "irrlichttypes_bloated.h"
#include "util/string.h"
#include "jthread/jmutex.h"
#include <string>
#include <map>
#include <list>
#include <set>

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

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


class Settings
{
public:
	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) const;


	/***********
	 * Getters *
	 ***********/

	std::string get(const std::string &name) const;
	bool getBool(const std::string &name) const;
	u16 getU16(const std::string &name) const;
	s16 getS16(const std::string &name) const;
	s32 getS32(const std::string &name) const;
	u64 getU64(const std::string &name) const;
	float getFloat(const std::string &name) const;
	v2f getV2F(const std::string &name) const;
	v3f getV3F(const std::string &name) const;
	u32 getFlagStr(const std::string &name, const FlagDesc *flagdesc,
			u32 *flagmask) const;
	// N.B. if getStruct() is used to read a non-POD aggregate type,
	// the behavior is undefined.
	bool getStruct(const std::string &name, const std::string &format,
			void *out, size_t olen) const;

	// return all keys used
	std::vector<std::string> getNames() const;
	bool exists(const std::string &name) const;


	/***************************************
	 * Getters that don't throw exceptions *