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// sol3
// The MIT License (MIT)
// Copyright (c) 2013-2019 Rapptz, ThePhD and contributors
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#ifndef SOL_TABLE_ITERATOR_HPP
#define SOL_TABLE_ITERATOR_HPP
#include "object.hpp"
#include <iterator>
namespace sol {
template <typename reference_type>
class basic_table_iterator : public std::iterator<std::input_iterator_tag, std::pair<object, object>> {
public:
typedef object key_type;
typedef object mapped_type;
typedef std::pair<object, object> value_type;
typedef std::input_iterator_tag iterator_category;
typedef std::ptrdiff_t difference_type;
typedef value_type* pointer;
typedef value_type& reference;
typedef const value_type& const_reference;
private:
std::pair<object, object> kvp;
reference_type ref;
int tableidx = 0;
int keyidx = 0;
std::ptrdiff_t idx = 0;
public:
basic_table_iterator()
: keyidx(-1), idx(-1) {
}
basic_table_iterator(reference_type x)
: ref(std::move(x)) {
ref.push();
tableidx = lua_gettop(ref.lua_state());
stack::push(ref.lua_state(), lua_nil);
this->operator++();
if (idx == -1) {
return;
}
--idx;
}
basic_table_iterator& operator++() {
if (idx == -1)
return *this;
if (lua_next(ref.lua_state(), tableidx) == 0) {
idx = -1;
keyidx = -1;
return *this;
}
++idx;
kvp.first = object(ref.lua_state(), -2);
kvp.second = object(ref.lua_state(), -1);
lua_pop(ref.lua_state(), 1);
// leave key on the stack
keyidx = lua_gettop(ref.lua_state());
return *this;
}
basic_table_iterator operator++(int) {
auto saved = *this;
this->operator++();
return saved;
}
reference operator*() {
return kvp;
}
const_reference operator*() const {
return kvp;
}
bool operator==(const basic_table_iterator& right) const {
return idx == right.idx;
}
bool operator!=(const basic_table_iterator& right) const {
return idx != right.idx;
}
~basic_table_iterator() {
if (keyidx != -1) {
stack::remove(ref.lua_state(), keyidx, 1);
}
if (ref.lua_state() != nullptr && ref.valid()) {
stack::remove(ref.lua_state(), tableidx, 1);
}
}
};
} // namespace sol
#endif // SOL_TABLE_ITERATOR_HPP
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