sol2/sol/table.hpp

// The MIT License (MIT)

// Copyright (c) 2013 Danny Y., Rapptz

// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:

// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

#ifndef SOL_TABLE_HPP
#define SOL_TABLE_HPP

#include "stack.hpp"
#include "lua_function.hpp"
#include <unordered_map>
#include <memory>

namespace sol {
class table : virtual public reference {
private:
     std::unordered_map<std::string, std::shared_ptr<detail::lua_func>> funcs;
public:
    table() noexcept: reference{} {}
    table(lua_State* L, int index = -1): reference(L, index) {
        type_assert(L, index, type::table);
    }

    template<typename T, typename U>
    T get(U&& key) const {
        push();
        stack::push(state(), std::forward<U>(key));
        lua_gettable(state(), -2);
        type_assert(state(), -1, type_of<T>());
        auto result = stack::pop<T>(state());
        lua_pop(state(), 1);
        return result;
    }

    template<typename T, typename U>
    table& set(T&& key, U&& value) {
        push();
        stack::push(state(), std::forward<T>(key));
        stack::push(state(), std::forward<U>(value));
        lua_settable(state(), -3);
        lua_pop(state(), 1);
        return *this;
    }

    template<typename T, typename TFx>
    table& set_function( T&& key, TFx&& fx ) {
	    typedef typename std::remove_pointer<typename std::decay<TFx>::type>::type clean_fx;
	    const static bool isfunction = std::is_function<clean_fx>::value;
	    return set_function( std::integral_constant<bool, !isfunction>( ),
		    std::forward<T>( key ), std::forward<TFx>( fx ) );
    }

    template<typename T, typename TFx>
    table& set_function( std::true_type, T&& key, TFx&& fx ) {
	    typedef typename std::decay<TFx>::type clean_fx;
	    std::string fkey( key );
	    lua_CFunction freefunc = &detail::lua_cfun;
	    auto hint = funcs.find( fkey );
	    detail::lua_func* target = nullptr;
	    if ( hint == funcs.end( ) ) {
		    std::shared_ptr<detail::lua_func> sptr( new detail::lambda_lua_func<clean_fx>( std::forward<TFx>( fx ) ) );
		    hint = funcs.emplace_hint( hint, fkey, std::move( sptr ) );
	    }
	    target = hint->second.get( );
	    lua_pushlightuserdata( state( ), static_cast<void*>( target ) );
	    lua_pushcclosure( state( ), freefunc, 1 );
	    lua_setglobal( state( ), fkey.c_str( ) );
	    return *this;
    }

    template <typename T, typename TFx>
    table& set_function( std::false_type, T&& key, TFx&& fx ) {
	    typedef typename std::decay<TFx>::type clean_fx;
	    std::string fkey( key );
	    lua_CFunction freefunc = &detail::lua_cfun;
	    auto hint = funcs.find( fkey );
	    detail::lua_func* target = nullptr;
	    if ( hint == funcs.end( ) ) {
		    std::shared_ptr<detail::lua_func> sptr( new detail::explicit_lua_func<TFx>( std::forward<TFx>( fx ) ) );
		    hint = funcs.emplace_hint( hint, fkey, std::move( sptr ) );
	    }
	    target = hint->second.get( );
	    lua_pushlightuserdata( state( ), static_cast<void*>( target ) );
	    lua_pushcclosure( state( ), freefunc, 1 );
	    lua_setglobal( state( ), fkey.c_str( ) );
	    return *this;
    }

    size_t size() const {
        push();
        return lua_rawlen(state(), -1);
    }
	
};
} // sol

#endif // SOL_TABLE_HPP