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https://github.com/OpenMW/openmw.git
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261 lines
8.7 KiB
C++
261 lines
8.7 KiB
C++
// sol2
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// The MIT License (MIT)
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// Copyright (c) 2013-2021 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_ENVIRONMENT_HPP
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#define SOL_ENVIRONMENT_HPP
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#include <sol/table.hpp>
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namespace sol {
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template <typename base_type>
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struct basic_environment : basic_table<base_type> {
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private:
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typedef basic_table<base_type> base_t;
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public:
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using base_t::lua_state;
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basic_environment() noexcept = default;
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basic_environment(const basic_environment&) = default;
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basic_environment(basic_environment&&) = default;
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basic_environment& operator=(const basic_environment&) = default;
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basic_environment& operator=(basic_environment&&) = default;
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basic_environment(const stack_reference& r) : basic_environment(r.lua_state(), r.stack_index()) {
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}
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basic_environment(stack_reference&& r) : basic_environment(r.lua_state(), r.stack_index()) {
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}
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basic_environment(lua_State* L, new_table nt) : base_t(L, std::move(nt)) {
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}
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template <bool b>
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basic_environment(lua_State* L, new_table t, const basic_reference<b>& fallback) : basic_environment(L, std::move(t)) {
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stack_table mt(L, new_table(0, 1));
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mt.set(meta_function::index, fallback);
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this->set(metatable_key, mt);
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mt.pop();
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}
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basic_environment(env_key_t, const stack_reference& extraction_target)
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: base_t(detail::no_safety, extraction_target.lua_state(), (stack::push_environment_of(extraction_target), -1)) {
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#if SOL_IS_ON(SOL_SAFE_REFERENCES_I_)
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constructor_handler handler {};
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stack::check<env_key_t>(this->lua_state(), -1, handler);
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#endif // Safety
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lua_pop(this->lua_state(), 2);
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}
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template <bool b>
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basic_environment(env_key_t, const basic_reference<b>& extraction_target)
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: base_t(detail::no_safety, extraction_target.lua_state(), (stack::push_environment_of(extraction_target), -1)) {
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#if SOL_IS_ON(SOL_SAFE_REFERENCES_I_)
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constructor_handler handler {};
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stack::check<env_key_t>(this->lua_state(), -1, handler);
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#endif // Safety
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lua_pop(this->lua_state(), 2);
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}
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basic_environment(lua_State* L, int index = -1) : base_t(detail::no_safety, L, index) {
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#if SOL_IS_ON(SOL_SAFE_REFERENCES_I_)
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constructor_handler handler {};
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stack::check<basic_environment>(L, index, handler);
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#endif // Safety
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}
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basic_environment(lua_State* L, ref_index index) : base_t(detail::no_safety, L, index) {
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#if SOL_IS_ON(SOL_SAFE_REFERENCES_I_)
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auto pp = stack::push_pop(*this);
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constructor_handler handler {};
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stack::check<basic_environment>(L, -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_environment>>, 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_environment(T&& r) noexcept : base_t(detail::no_safety, std::forward<T>(r)) {
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#if SOL_IS_ON(SOL_SAFE_REFERENCES_I_)
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if (!is_environment<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_environment>(lua_state(), -1, handler);
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}
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#endif // Safety
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}
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basic_environment(lua_nil_t r) noexcept : base_t(detail::no_safety, 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_environment(lua_State* L, T&& r) noexcept : base_t(detail::no_safety, L, std::forward<T>(r)) {
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#if SOL_IS_ON(SOL_SAFE_REFERENCES_I_)
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if (!is_environment<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_environment>(lua_state(), -1, handler);
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}
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#endif // Safety
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}
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template <typename T>
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bool set_on(const T& target) const {
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lua_State* L = target.lua_state();
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auto pp = stack::push_pop(target);
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int target_index = pp.index_of(target);
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#if SOL_LUA_VERSION_I_ < 502
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// Use lua_setfenv
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this->push();
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int success_result = lua_setfenv(L, target_index);
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return success_result != 0;
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#else
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// If this is a C function, the environment is always placed in
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// the first value, as is expected of sol2 (all upvalues have an empty name, "")
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if (lua_iscfunction(L, target_index) != 0) {
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const char* maybe_upvalue_name = lua_getupvalue(L, target_index, 1);
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if (maybe_upvalue_name == nullptr) {
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return false;
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}
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string_view upvalue_name(maybe_upvalue_name);
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if (upvalue_name == "") {
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this->push();
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const char* success = lua_setupvalue(L, target_index, 1);
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if (success == nullptr) {
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// left things alone on the stack, pop them off
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lua_pop(L, 1);
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return false;
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}
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return true;
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}
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return false;
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}
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else {
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// Must search for the right upvalue target on index
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for (int upvalue_index = 1;; ++upvalue_index) {
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const char* maybe_upvalue_name = lua_getupvalue(L, target_index, upvalue_index);
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if (maybe_upvalue_name == nullptr) {
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break;
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}
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string_view upvalue_name(maybe_upvalue_name);
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if (upvalue_name == "_ENV") {
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this->push();
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const char* success = lua_setupvalue(L, target_index, upvalue_index);
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if (success == nullptr) {
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// left things alone on the stack, pop them off
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lua_pop(L, 1);
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break;
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}
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// whether or not we succeeded, we found _ENV
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// so we need to break
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return true;
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}
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lua_pop(L, 1);
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}
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// if we get here,
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// we did not find an _ENV here...
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return false;
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}
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#endif
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}
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};
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template <typename T, typename E>
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bool set_environment(const basic_environment<E>& env, const T& target) {
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return env.set_on(target);
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}
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template <typename E = reference, typename T>
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basic_environment<E> get_environment(const T& target) {
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lua_State* L = target.lua_state();
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auto pp = stack::pop_n(L, stack::push_environment_of(target));
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return basic_environment<E>(L, -1);
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}
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struct this_environment {
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optional<environment> env;
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this_environment() : env(nullopt) {
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}
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this_environment(environment e) : env(std::move(e)) {
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}
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this_environment(const this_environment&) = default;
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this_environment(this_environment&&) = default;
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this_environment& operator=(const this_environment&) = default;
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this_environment& operator=(this_environment&&) = default;
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explicit operator bool() const {
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return static_cast<bool>(env);
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}
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operator optional<environment>&() {
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return env;
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}
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operator const optional<environment>&() const {
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return env;
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}
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operator environment&() {
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return env.value();
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}
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operator const environment&() const {
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return env.value();
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}
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};
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namespace stack {
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template <>
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struct unqualified_getter<env_key_t> {
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static environment get(lua_State* L, int index, record& tracking) {
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tracking.use(1);
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return get_environment(stack_reference(L, raw_index(index)));
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}
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};
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template <>
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struct unqualified_getter<this_environment> {
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static this_environment get(lua_State* L, int, record& tracking) {
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tracking.use(0);
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lua_Debug info;
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// Level 0 means current function (this C function, which may or may not be useful for us?)
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// Level 1 means next call frame up the stack. (Can be nothing if function called directly from C++ with lua_p/call)
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int pre_stack_size = lua_gettop(L);
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if (lua_getstack(L, 1, &info) != 1) {
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if (lua_getstack(L, 0, &info) != 1) {
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lua_settop(L, pre_stack_size);
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return this_environment();
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}
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}
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if (lua_getinfo(L, "f", &info) == 0) {
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lua_settop(L, pre_stack_size);
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return this_environment();
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}
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stack_reference f(L, -1);
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environment env(env_key, f);
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if (!env.valid()) {
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lua_settop(L, pre_stack_size);
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return this_environment();
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}
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return this_environment(std::move(env));
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}
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};
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} // namespace stack
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} // namespace sol
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#endif // SOL_ENVIRONMENT_HPP
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