mirror of
https://github.com/ThePhD/sol2.git
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169 lines
6.6 KiB
C++
169 lines
6.6 KiB
C++
// sol3
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// The MIT License (MIT)
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// Copyright (c) 2013-2019 Rapptz, ThePhD and contributors
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// Permission is hereby granted, free of charge, to any person obtaining a copy of
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// this software and associated documentation files (the "Software"), to deal in
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// the Software without restriction, including without limitation the rights to
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// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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// the Software, and to permit persons to whom the Software is furnished to do so,
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// subject to the following conditions:
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#ifndef SOL_METATABLE_HPP
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#define SOL_METATABLE_HPP
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#include "table_core.hpp"
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#include "usertype.hpp"
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namespace sol {
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template <typename base_type>
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class basic_metatable : public basic_table<base_type> {
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typedef basic_table<base_type> base_t;
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friend class state;
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friend class state_view;
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protected:
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basic_metatable(detail::no_safety_tag, lua_nil_t n) : base_t(n) {
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}
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basic_metatable(detail::no_safety_tag, lua_State* L, int index) : base_t(L, index) {
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}
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basic_metatable(detail::no_safety_tag, lua_State* L, ref_index index) : base_t(L, index) {
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}
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template <typename T,
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meta::enable<meta::neg<meta::any_same<meta::unqualified_t<T>, basic_metatable>>, meta::neg<std::is_same<base_type, stack_reference>>,
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meta::neg<std::is_same<lua_nil_t, meta::unqualified_t<T>>>, is_lua_reference<meta::unqualified_t<T>>> = meta::enabler>
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basic_metatable(detail::no_safety_tag, T&& r) noexcept : base_t(std::forward<T>(r)) {
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}
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template <typename T, meta::enable<is_lua_reference<meta::unqualified_t<T>>> = meta::enabler>
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basic_metatable(detail::no_safety_tag, lua_State* L, T&& r) noexcept : base_t(L, std::forward<T>(r)) {
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}
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public:
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using base_t::lua_state;
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basic_metatable() noexcept = default;
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basic_metatable(const basic_metatable&) = default;
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basic_metatable(basic_metatable&&) = default;
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basic_metatable& operator=(const basic_metatable&) = default;
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basic_metatable& operator=(basic_metatable&&) = default;
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basic_metatable(const stack_reference& r) : basic_metatable(r.lua_state(), r.stack_index()) {
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}
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basic_metatable(stack_reference&& r) : basic_metatable(r.lua_state(), r.stack_index()) {
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}
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template <typename T, meta::enable_any<is_lua_reference<meta::unqualified_t<T>>> = meta::enabler>
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basic_metatable(lua_State* L, T&& r) : base_t(L, std::forward<T>(r)) {
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#if defined(SOL_SAFE_REFERENCES) && SOL_SAFE_REFERENCES
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auto pp = stack::push_pop(*this);
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constructor_handler handler{};
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stack::check<basic_metatable>(lua_state(), -1, handler);
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#endif // Safety
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}
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basic_metatable(lua_State* L, int index = -1) : basic_metatable(detail::no_safety, L, index) {
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#if defined(SOL_SAFE_REFERENCES) && SOL_SAFE_REFERENCES
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constructor_handler handler{};
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stack::check<basic_metatable>(L, index, handler);
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#endif // Safety
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}
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basic_metatable(lua_State* L, ref_index index) : basic_metatable(detail::no_safety, L, index) {
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#if defined(SOL_SAFE_REFERENCES) && SOL_SAFE_REFERENCES
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auto pp = stack::push_pop(*this);
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constructor_handler handler{};
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stack::check<basic_metatable>(lua_state(), -1, handler);
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#endif // Safety
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}
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template <typename T,
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meta::enable<meta::neg<meta::any_same<meta::unqualified_t<T>, basic_metatable>>, meta::neg<std::is_same<base_type, stack_reference>>,
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meta::neg<std::is_same<lua_nil_t, meta::unqualified_t<T>>>, is_lua_reference<meta::unqualified_t<T>>> = meta::enabler>
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basic_metatable(T&& r) noexcept : basic_metatable(detail::no_safety, std::forward<T>(r)) {
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#if defined(SOL_SAFE_REFERENCES) && SOL_SAFE_REFERENCES
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if (!is_table<meta::unqualified_t<T>>::value) {
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auto pp = stack::push_pop(*this);
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constructor_handler handler{};
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stack::check<basic_metatable>(base_t::lua_state(), -1, handler);
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}
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#endif // Safety
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}
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basic_metatable(lua_nil_t r) noexcept : basic_metatable(detail::no_safety, r) {
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}
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template <typename Key, typename Value>
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void set(Key&& key, Value&& value);
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void unregister() {
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using ustorage_base = u_detail::usertype_storage_base;
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lua_State* L = this->lua_state();
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auto pp = stack::push_pop(*this);
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int top = lua_gettop(L);
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stack_reference mt(L, -1);
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stack::get_field(L, meta_function::gc_names, mt.stack_index());
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if (type_of(L, -1) != type::table) {
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return;
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}
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stack_reference gc_names_table(L, -1);
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stack::get_field(L, meta_function::storage, mt.stack_index());
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if (type_of(L, -1) != type::lightuserdata) {
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return;
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}
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ustorage_base& base_storage = *static_cast<ustorage_base*>(stack::get<void*>(L, -1));
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std::array<string_view, 6> registry_traits;
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for (std::size_t i = 0; i < registry_traits.size(); ++i) {
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u_detail::submetatable_type smt = static_cast<u_detail::submetatable_type>(i);
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stack::get_field<false, true>(L, smt, gc_names_table.stack_index());
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registry_traits[i] = stack::get<string_view>(L, -1);
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}
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// get the registry
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stack_reference registry(L, raw_index(LUA_REGISTRYINDEX));
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registry.push();
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// eliminate all named entries for this usertype
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// in the registry (luaL_newmetatable does
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// [name] = new table
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// in registry upon creation)
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for (std::size_t i = 0; i < registry_traits.size(); ++i) {
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u_detail::submetatable_type smt = static_cast<u_detail::submetatable_type>(i);
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const string_view& gcmetakey = registry_traits[i];
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if (smt == u_detail::submetatable_type::named) {
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// use .data() to make it treat it like a c string,
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// which it is...
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stack::set_field<true>(L, gcmetakey.data(), lua_nil);
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}
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else {
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// do not change the values in the registry: they need to be present
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// no matter what, for safety's sake
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//stack::set_field(L, gcmetakey, lua_nil, registry.stack_index());
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}
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}
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// destroy all storage and tables
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base_storage.clear();
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// 6 strings from gc_names table,
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// + 1 registry,
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// + 1 gc_names table
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// + 1 light userdata of storage
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// + 1 registry
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// 10 total, 4 left since popping off 6 gc_names tables
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lua_settop(L, top);
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}
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};
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} // namespace sol
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#endif // SOL_METATABLE_HPP
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