mirror of
https://github.com/ThePhD/sol2.git
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119 lines
3.2 KiB
C++
119 lines
3.2 KiB
C++
// sol3
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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_TABLE_ITERATOR_HPP
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#define SOL_TABLE_ITERATOR_HPP
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#include <sol/object.hpp>
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#include <iterator>
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namespace sol {
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template <typename reference_type>
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class basic_table_iterator {
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public:
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typedef object key_type;
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typedef object mapped_type;
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typedef std::pair<object, object> value_type;
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typedef std::input_iterator_tag iterator_category;
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typedef std::ptrdiff_t difference_type;
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typedef value_type* pointer;
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typedef value_type& reference;
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typedef const value_type& const_reference;
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private:
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std::pair<object, object> kvp;
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reference_type ref;
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int tableidx = 0;
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int keyidx = 0;
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std::ptrdiff_t idx = 0;
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public:
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basic_table_iterator() noexcept : keyidx(-1), idx(-1) {
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}
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basic_table_iterator(reference_type x) noexcept : ref(std::move(x)) {
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ref.push();
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tableidx = lua_gettop(ref.lua_state());
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stack::push(ref.lua_state(), lua_nil);
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this->operator++();
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if (idx == -1) {
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return;
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}
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--idx;
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}
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basic_table_iterator& operator++() noexcept {
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if (idx == -1)
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return *this;
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if (lua_next(ref.lua_state(), tableidx) == 0) {
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idx = -1;
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keyidx = -1;
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return *this;
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}
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++idx;
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kvp.first = object(ref.lua_state(), -2);
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kvp.second = object(ref.lua_state(), -1);
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lua_pop(ref.lua_state(), 1);
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// leave key on the stack
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keyidx = lua_gettop(ref.lua_state());
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return *this;
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}
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basic_table_iterator operator++(int) noexcept {
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auto saved = *this;
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this->operator++();
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return saved;
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}
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reference operator*() noexcept {
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return kvp;
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}
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const_reference operator*() const noexcept {
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return kvp;
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}
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bool operator==(const basic_table_iterator& right) const noexcept {
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return idx == right.idx;
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}
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bool operator!=(const basic_table_iterator& right) const noexcept {
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return idx != right.idx;
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}
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~basic_table_iterator() {
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if (keyidx != -1) {
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stack::remove(ref.lua_state(), keyidx, 1);
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}
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if (ref.lua_state() != nullptr && ref.valid()) {
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stack::remove(ref.lua_state(), tableidx, 1);
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}
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}
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};
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} // namespace sol
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#endif // SOL_TABLE_ITERATOR_HPP
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