mirror of
https://github.com/ThePhD/sol2.git
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98 lines
3.2 KiB
C++
98 lines
3.2 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 Spermission 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_DETAIL_PAIRS_HPP
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#define SOL_DETAIL_PAIRS_HPP
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#include <sol/version.hpp>
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#include <sol/stack.hpp>
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#include <sol/stack_reference.hpp>
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#include <sol/protected_function.hpp>
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#include <sol/assert.hpp>
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#include <optional>
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namespace sol { namespace stack { namespace stack_detail {
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inline bool maybe_push_lua_next_function(lua_State* L_) {
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stack::get_field<true, false>(L_, "next");
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bool is_next = stack::check<protected_function>(L_);
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if (is_next) {
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return true;
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}
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stack::get_field<true, false>(L_, "table");
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if (!stack::check<table>(L_, -1)) {
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return false;
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}
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lua_getfield(L_, -1, "next");
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bool is_table_next_func = stack::check<protected_function>(L_, -1);
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if (is_table_next_func) {
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return true;
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}
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lua_pop(L_, 1);
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return false;
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}
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inline std::optional<protected_function> find_lua_next_function(lua_State* L_) {
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if (maybe_push_lua_next_function(L_)) {
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return stack::pop<protected_function>(L_);
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}
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return std::nullopt;
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}
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inline int c_lua_next(lua_State* L_) noexcept {
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stack_reference table_stack_ref(L_, raw_index(1));
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stateless_stack_reference key_stack_ref(L_, raw_index(2));
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int result = lua_next(table_stack_ref.lua_state(), table_stack_ref.stack_index());
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if (result == 0) {
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stack::push(L_, lua_nil);
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return 1;
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}
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return 2;
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}
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inline int readonly_pairs(lua_State* L_) noexcept {
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int pushed = 0;
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if (!maybe_push_lua_next_function(L_)) {
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// we do not have the "next" function in the global namespace
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// from the "table" global entiry, use our own
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pushed += stack::push(L_, &c_lua_next);
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}
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else {
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pushed += 1;
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}
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int metatable_exists = lua_getmetatable(L_, 1);
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sol_c_assert(metatable_exists == 1);
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const auto& index_key = to_string(sol::meta_function::index);
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lua_getfield(L_, lua_gettop(L_), index_key.c_str());
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lua_remove(L_, -2);
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pushed += 1;
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pushed += stack::push(L_, lua_nil);
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return pushed;
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}
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}}} // sol::stack::stack_detail
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#endif // SOL_DETAIL_PAIRS_HPP
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