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// license:BSD-3-Clause
// copyright-holders:Miodrag Milanovic
/***************************************************************************

    luaengine.ipp

    Controls execution of the core MAME system.

***************************************************************************/
#ifndef MAME_FRONTEND_MAME_LUAENGINE_IPP
#define MAME_FRONTEND_MAME_LUAENGINE_IPP

#include "luaengine.h"

#include "options.h"

#include <lua.hpp>


namespace sol {

class buffer
{
public:
	// sol does lua_settop(0), save userdata buffer in registry if necessary
	buffer(int size, lua_State *L)
	{
		ptr = luaL_buffinitsize(L, &buff, size);
		len = size;
		if(buff.b != buff.initb)
		{
			lua_pushvalue(L, -1);
			lua_setfield(L, LUA_REGISTRYINDEX, "sol::buffer_temp");
		}
	}
	~buffer()
	{
		lua_State *L = buff.L;
		if(lua_getfield(L, LUA_REGISTRYINDEX, "sol::buffer_temp") != LUA_TNIL)
		{
			lua_pushnil(L);
			lua_setfield(L, LUA_REGISTRYINDEX, "sol::buffer_temp");
		}
		else
			lua_pop(L, -1);

		luaL_pushresultsize(&buff, len);
	}

	void set_len(int size) { len = size; }
	int get_len() { return len; }
	char *get_ptr() { return ptr; }

private:
	luaL_Buffer buff;
	int len;
	char *ptr;
};


// don't convert core_optons to a table directly
template <> struct is_container<core_options> : std::false_type { };

// buffer customisation
sol::buffer *sol_lua_get(sol::types<buffer *>, lua_State *L, int index, sol::stack::record &tracking);
int sol_lua_push(sol::types<buffer *>, lua_State *L, buffer *value);

// lua_engine::devenum  customisation
template <typename T> struct is_container<lua_engine::devenum<T> > : std::true_type { };
template <typename T> struct usertype_container<lua_engine::devenum<T> >;

} // namespace sol


// osd_file::error customisation
int sol_lua_push(sol::types<osd_file::error>, lua_State *L, osd_file::error &&value);
template <typename Handler>
bool sol_lua_check(sol::types<osd_file::error>, lua_State *L, int index, Handler &&handler, sol::stack::record &tracking);

// map_handler_type customisation
int sol_lua_push(sol::types<map_handler_type>, lua_State *L, map_handler_type &&value);


template <typename T, typename C, typename I>
struct lua_engine::immutable_container_helper
{
protected:
	using iterator = I;

	static T &get_self(lua_State *L)
	{
		auto p(sol::stack::unqualified_check_get<T *>(L, 1));
		if (!p)
			luaL_error(L, "sol: 'self' is not of type '%s' (pass 'self' as first argument with ':' or call on proper type)", sol::detail::demangle<T>().c_str());
		if (!*p)
			luaL_error(L, "sol: 'self' argument is nil (pass 'self' as first argument with ':' or call on a '%s' type", sol::detail::demangle<T>().c_str());
		return **p;
	}

	struct indexed_iterator
	{
		indexed_iterator(C &s, iterator i) : src(s), it(i), ix(0U) { }

		C &src;
		iterator it;
		std::size_t ix;

		indexed_iterator &operator++()
		{
			++it;
			++ix;
			return *this;
		}
	};

public:
	static int set(lua_State *L)
	{
		return luaL_error(L, "sol: cannot call 'set(key, value)' on type '%s': container is not modifiable", sol::detail::demangle<T>().c_str());
	}

	static int index_set(lua_State *L)
	{
		return luaL_error(L, "sol: cannot call 'container[key] = value' on type '%s': container is not modifiable", sol::detail::demangle<T>().c_str());
	}

	static int add(lua_State *L)
	{
		return luaL_error(L, "sol: cannot call 'add' on type '%s': container is not modifiable", sol::detail::demangle<T>().c_str());
	}

	static int insert(lua_State *L)
	{
		return luaL_error(L, "sol: cannot call 'insert' on type '%s': container is not modifiable", sol::detail::demangle<T>().c_str());
	}

	static int find(lua_State *L)
	{
		return luaL_error(L, "sol: cannot call 'find' on type '%s': no supported comparison operator for the value type", sol::detail::demangle<T>().c_str());
	}

	static int clear(lua_State *L)
	{
		return luaL_error(L, "sol: cannot call 'clear' on type '%s': container is not modifiable", sol::detail::demangle<T>().c_str());
	}

	static int erase(lua_State *L)
	{
		return luaL_error(L, "sol: cannot call 'erase' on type '%s': container is not modifiable", sol::detail::demangle<T>().c_str());
	}
};


struct lua_engine::addr_space
{
	addr_space(address_space &s, device_memory_interface &d) : space(s), dev(d) { }

	template <typename T> T mem_read(offs_t address);
	template <typename T> void mem_write(offs_t address, T val);
	template <typename T> T log_mem_read(offs_t address);
	template <typename T> void log_mem_write(offs_t address, T val);
	template <typename T> T direct_mem_read(offs_t address);
	template <typename T> void direct_mem_write(offs_t address, T val);

	address_space &space;
	device_memory_interface &dev;
};


template <typename T, size_t SIZE>
class lua_engine::enum_parser
{
public:
	constexpr enum_parser(std::initializer_list<std::pair<const char *, T>> values)
	{
		if (values.size() != SIZE)
			throw false && "size template argument incorrectly specified";
		std::copy(values.begin(), values.end(), m_map.begin());
	}

	T operator()(const char *text) const
	{
		auto iter = std::find_if(
			m_map.begin() + 1,
			m_map.end(),
			[text](const auto &x) { return !strcmp(text, x.first); });
		if (iter == m_map.end())
			iter = m_map.begin();
		return iter->second;
	}

	T operator()(const std::string &text) const
	{
		return (*this)(text.c_str());
	}

private:
	std::array<std::pair<const char *, T>, SIZE> m_map;
};


//-------------------------------------------------
//  invoke - invokes a function, wrapping profiler
//-------------------------------------------------

template <typename TFunc, typename... TArgs>
inline sol::protected_function_result lua_engine::invoke(TFunc &&func, TArgs &&... args)
{
	g_profiler.start(PROFILER_LUA);
	sol::protected_function_result result = func(std::forward<TArgs>(args)...);
	g_profiler.stop();
	return result;
}

#endif // MAME_FRONTEND_MAME_LUAENGINE_IPP