File size: 4,884 Bytes
4dd49b2 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 | #ifndef VALUE_DETAIL_NODE_ITERATOR_H_62B23520_7C8E_11DE_8A39_0800200C9A66
#define VALUE_DETAIL_NODE_ITERATOR_H_62B23520_7C8E_11DE_8A39_0800200C9A66
#if defined(_MSC_VER) || \
(defined(__GNUC__) && (__GNUC__ == 3 && __GNUC_MINOR__ >= 4) || \
(__GNUC__ >= 4)) // GCC supports "pragma once" correctly since 3.4
#pragma once
#endif
#include "yaml-cpp/dll.h"
#include "yaml-cpp/node/ptr.h"
#include <cstddef>
#include <iterator>
#include <memory>
#include <map>
#include <utility>
#include <vector>
namespace YAML {
namespace detail {
struct iterator_type {
enum value { NoneType, Sequence, Map };
};
template <typename V>
struct node_iterator_value : public std::pair<V*, V*> {
using kv = std::pair<V*, V*>;
node_iterator_value() : kv(), pNode(nullptr) {}
explicit node_iterator_value(V& rhs) : kv(), pNode(&rhs) {}
explicit node_iterator_value(V& key, V& value) : kv(&key, &value), pNode(nullptr) {}
V& operator*() const { return *pNode; }
V& operator->() const { return *pNode; }
V* pNode;
};
using node_seq = std::vector<node *>;
using node_map = std::vector<std::pair<node*, node*>>;
template <typename V>
struct node_iterator_type {
using seq = node_seq::iterator;
using map = node_map::iterator;
};
template <typename V>
struct node_iterator_type<const V> {
using seq = node_seq::const_iterator;
using map = node_map::const_iterator;
};
template <typename V>
class node_iterator_base {
private:
struct enabler {};
struct proxy {
explicit proxy(const node_iterator_value<V>& x) : m_ref(x) {}
node_iterator_value<V>* operator->() { return std::addressof(m_ref); }
operator node_iterator_value<V>*() { return std::addressof(m_ref); }
node_iterator_value<V> m_ref;
};
public:
using iterator_category = std::forward_iterator_tag;
using value_type = node_iterator_value<V>;
using difference_type = std::ptrdiff_t;
using pointer = node_iterator_value<V>*;
using reference = node_iterator_value<V>;
using SeqIter = typename node_iterator_type<V>::seq;
using MapIter = typename node_iterator_type<V>::map;
node_iterator_base()
: m_type(iterator_type::NoneType), m_seqIt(), m_mapIt(), m_mapEnd() {}
explicit node_iterator_base(SeqIter seqIt)
: m_type(iterator_type::Sequence),
m_seqIt(seqIt),
m_mapIt(),
m_mapEnd() {}
explicit node_iterator_base(MapIter mapIt, MapIter mapEnd)
: m_type(iterator_type::Map),
m_seqIt(),
m_mapIt(mapIt),
m_mapEnd(mapEnd) {
m_mapIt = increment_until_defined(m_mapIt);
}
template <typename W>
node_iterator_base(const node_iterator_base<W>& rhs,
typename std::enable_if<std::is_convertible<W*, V*>::value,
enabler>::type = enabler())
: m_type(rhs.m_type),
m_seqIt(rhs.m_seqIt),
m_mapIt(rhs.m_mapIt),
m_mapEnd(rhs.m_mapEnd) {}
template <typename>
friend class node_iterator_base;
template <typename W>
bool operator==(const node_iterator_base<W>& rhs) const {
if (m_type != rhs.m_type)
return false;
switch (m_type) {
case iterator_type::NoneType:
return true;
case iterator_type::Sequence:
return m_seqIt == rhs.m_seqIt;
case iterator_type::Map:
return m_mapIt == rhs.m_mapIt;
}
return true;
}
template <typename W>
bool operator!=(const node_iterator_base<W>& rhs) const {
return !(*this == rhs);
}
node_iterator_base<V>& operator++() {
switch (m_type) {
case iterator_type::NoneType:
break;
case iterator_type::Sequence:
++m_seqIt;
break;
case iterator_type::Map:
++m_mapIt;
m_mapIt = increment_until_defined(m_mapIt);
break;
}
return *this;
}
node_iterator_base<V> operator++(int) {
node_iterator_base<V> iterator_pre(*this);
++(*this);
return iterator_pre;
}
value_type operator*() const {
switch (m_type) {
case iterator_type::NoneType:
return value_type();
case iterator_type::Sequence:
return value_type(**m_seqIt);
case iterator_type::Map:
return value_type(*m_mapIt->first, *m_mapIt->second);
}
return value_type();
}
proxy operator->() const { return proxy(**this); }
MapIter increment_until_defined(MapIter it) {
while (it != m_mapEnd && !is_defined(it))
++it;
return it;
}
bool is_defined(MapIter it) const {
return it->first->is_defined() && it->second->is_defined();
}
private:
typename iterator_type::value m_type;
SeqIter m_seqIt;
MapIter m_mapIt, m_mapEnd;
};
using node_iterator = node_iterator_base<node>;
using const_node_iterator = node_iterator_base<const node>;
}
}
#endif // VALUE_DETAIL_NODE_ITERATOR_H_62B23520_7C8E_11DE_8A39_0800200C9A66
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