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275 lines
8.5 KiB
C++
275 lines
8.5 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_PAIRS_ITERATOR_HPP
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#define SOL_PAIRS_ITERATOR_HPP
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#include <sol/version.hpp>
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#include <sol/reference.hpp>
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#include <sol/stack_reference.hpp>
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#include <sol/table_iterator.hpp>
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#include <sol/protected_function.hpp>
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#include <sol/stack/detail/pairs.hpp>
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namespace sol {
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struct pairs_sentinel { };
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class pairs_iterator {
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private:
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inline static constexpr int empty_key_index = -1;
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public:
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using key_type = object;
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using mapped_type = object;
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using value_type = std::pair<object, object>;
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using iterator_category = std::input_iterator_tag;
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using difference_type = std::ptrdiff_t;
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using pointer = value_type*;
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using const_pointer = value_type const*;
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using reference = value_type&;
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using const_reference = const value_type&;
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pairs_iterator() noexcept
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: m_L(nullptr)
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, m_next_function_ref(lua_nil)
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, m_table_ref(lua_nil)
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, m_cached_key_value_pair({ lua_nil, lua_nil })
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, m_key_index(empty_key_index)
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, m_iteration_index(0) {
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}
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pairs_iterator(const pairs_iterator&) = delete;
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pairs_iterator& operator=(const pairs_iterator&) = delete;
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pairs_iterator(pairs_iterator&& right) noexcept
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: m_L(right.m_L)
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, m_next_function_ref(std::move(right.m_next_function_ref))
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, m_table_ref(std::move(right.m_table_ref))
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, m_cached_key_value_pair(std::move(right.m_cached_key_value_pair))
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, m_key_index(right.m_key_index)
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, m_iteration_index(right.m_iteration_index) {
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right.m_key_index = empty_key_index;
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}
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pairs_iterator& operator=(pairs_iterator&& right) noexcept {
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m_L = right.m_L;
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m_next_function_ref = std::move(right.m_next_function_ref);
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m_table_ref = std::move(right.m_table_ref);
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m_cached_key_value_pair = std::move(right.m_cached_key_value_pair);
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m_key_index = right.m_key_index;
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m_iteration_index = right.m_iteration_index;
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right.m_key_index = empty_key_index;
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return *this;
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}
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template <typename Source>
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pairs_iterator(const Source& source_) noexcept : m_L(source_.lua_state()), m_key_index(empty_key_index), m_iteration_index(0) {
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if (m_L == nullptr || !source_.valid()) {
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m_key_index = empty_key_index;
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return;
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}
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int source_index = -source_.push(m_L);
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int abs_source_index = lua_absindex(m_L, source_index);
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int metatable_exists = lua_getmetatable(m_L, abs_source_index);
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lua_remove(m_L, abs_source_index);
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if (metatable_exists == 1) {
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// just has a metatable, but does it have __pairs ?
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stack_reference metatable(m_L, raw_index(abs_source_index));
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stack::get_field<is_global_table_v<Source>, true>(m_L, meta_function::pairs, metatable.stack_index());
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optional<protected_function> maybe_pairs_function = stack::pop<optional<protected_function>>(m_L);
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if (maybe_pairs_function.has_value()) {
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protected_function& pairs_function = *maybe_pairs_function;
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protected_function_result next_fn_and_table_and_first_key = pairs_function(source_);
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if (next_fn_and_table_and_first_key.valid()) {
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m_next_function_ref = next_fn_and_table_and_first_key.get<protected_function>(0);
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m_table_ref = next_fn_and_table_and_first_key.get<sol::reference>(1);
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m_key_index = next_fn_and_table_and_first_key.stack_index() - 1;
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// remove next function and table
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lua_remove(m_L, m_key_index);
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lua_remove(m_L, m_key_index);
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next_fn_and_table_and_first_key.abandon();
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lua_remove(m_L, abs_source_index);
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this->operator++();
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m_iteration_index = 0;
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return;
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}
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}
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}
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{
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auto maybe_next = stack::stack_detail::find_lua_next_function(m_L);
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if (maybe_next.has_value()) {
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m_next_function_ref = std::move(*maybe_next);
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m_table_ref = source_;
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stack::push(m_L, lua_nil);
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m_key_index = lua_gettop(m_L);
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this->operator++();
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m_iteration_index = 0;
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return;
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}
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}
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// okay, so none of the above worked and now we need to create
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// a shim / polyfill instead
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stack::push(m_L, &stack::stack_detail::c_lua_next);
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m_next_function_ref = stack::pop<protected_function>(m_L);
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m_table_ref = source_;
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stack::push(m_L, lua_nil);
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m_key_index = lua_gettop(m_L);
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this->operator++();
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m_iteration_index = 0;
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}
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pairs_iterator& operator++() {
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if (m_key_index == empty_key_index) {
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return *this;
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}
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{
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sol::protected_function_result next_results = m_next_function_ref(m_table_ref, stack_reference(m_L, m_key_index));
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if (!next_results.valid()) {
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// TODO: abort, or throw an error?
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m_clear();
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m_key_index = empty_key_index;
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return *this;
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}
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int next_results_count = next_results.return_count();
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if (next_results_count < 2) {
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// iteration is over!
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next_results.abandon();
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lua_settop(m_L, m_key_index - 1);
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m_key_index = empty_key_index;
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++m_iteration_index;
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return *this;
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}
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else {
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lua_remove(m_L, m_key_index);
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m_key_index = next_results.stack_index() - 1;
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m_cached_key_value_pair.first = stack::get<object>(m_L, m_key_index);
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m_cached_key_value_pair.second = stack::get<object>(m_L, m_key_index + 1);
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lua_settop(m_L, m_key_index);
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next_results.abandon();
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}
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}
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++m_iteration_index;
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return *this;
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}
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std::ptrdiff_t index() const {
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return static_cast<std::ptrdiff_t>(m_iteration_index);
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}
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const_reference operator*() const noexcept {
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return m_cached_key_value_pair;
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}
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reference operator*() noexcept {
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return m_cached_key_value_pair;
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}
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friend bool operator==(const pairs_iterator& left, const pairs_iterator& right) noexcept {
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return left.m_table_ref == right.m_table_ref && left.m_iteration_index == right.m_iteration_index;
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}
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friend bool operator!=(const pairs_iterator& left, const pairs_iterator& right) noexcept {
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return left.m_table_ref != right.m_table_ref || left.m_iteration_index != right.m_iteration_index;
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}
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friend bool operator==(const pairs_iterator& left, const pairs_sentinel&) noexcept {
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return left.m_key_index == empty_key_index;
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}
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friend bool operator!=(const pairs_iterator& left, const pairs_sentinel&) noexcept {
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return left.m_key_index != empty_key_index;
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}
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friend bool operator==(const pairs_sentinel&, const pairs_iterator& left) noexcept {
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return left.m_key_index == empty_key_index;
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}
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friend bool operator!=(const pairs_sentinel&, const pairs_iterator& left) noexcept {
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return left.m_key_index != empty_key_index;
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}
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~pairs_iterator() {
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if (m_key_index != empty_key_index) {
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m_clear();
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}
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}
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private:
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void m_clear() noexcept {
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lua_remove(m_L, m_key_index);
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}
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lua_State* m_L;
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protected_function m_next_function_ref;
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sol::reference m_table_ref;
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std::pair<object, object> m_cached_key_value_pair;
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int m_key_index;
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int m_iteration_index;
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};
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template <typename Source>
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class basic_pairs_range {
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private:
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using source_t = std::add_lvalue_reference_t<Source>;
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source_t m_source;
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public:
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using iterator = pairs_iterator;
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using const_iterator = pairs_iterator;
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basic_pairs_range(source_t source_) noexcept : m_source(source_) {
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}
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iterator begin() noexcept {
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return iterator(m_source);
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}
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iterator begin() const noexcept {
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return iterator(m_source);
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}
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const_iterator cbegin() const noexcept {
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return const_iterator(m_source);
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}
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pairs_sentinel end() noexcept {
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return {};
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}
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pairs_sentinel end() const noexcept {
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return {};
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}
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pairs_sentinel cend() const noexcept {
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return {};
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}
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};
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} // namespace sol
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#endif // SOL_PAIRS_ITERATOR_HPP
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