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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2022, Google Inc.
*
* yaml_parser.h - libcamera YAML parsing helper
*/
#pragma once
#include <iterator>
#include <map>
#include <string>
#include <vector>
#include <libcamera/base/class.h>
#include <libcamera/geometry.h>
namespace libcamera {
class File;
class YamlParserContext;
class YamlObject
{
private:
using DictContainer = std::map<std::string, std::unique_ptr<YamlObject>>;
using ListContainer = std::vector<std::unique_ptr<YamlObject>>;
public:
#ifndef __DOXYGEN__
template<typename Container, typename Derived>
class Iterator
{
public:
using difference_type = std::ptrdiff_t;
using iterator_category = std::forward_iterator_tag;
Iterator(typename Container::const_iterator it)
: it_(it)
{
}
Derived &operator++()
{
++it_;
return *static_cast<Derived *>(this);
}
Derived operator++(int)
{
Derived it = *static_cast<Derived *>(this);
it_++;
return it;
}
friend bool operator==(const Iterator &a, const Iterator &b)
{
return a.it_ == b.it_;
}
friend bool operator!=(const Iterator &a, const Iterator &b)
{
return a.it_ != b.it_;
}
protected:
typename Container::const_iterator it_;
};
template<typename Container, typename Iterator>
class Adapter
{
public:
Adapter(const Container &container)
: container_(container)
{
}
Iterator begin() const
{
return Iterator{ container_.begin() };
}
Iterator end() const
{
return Iterator{ container_.end() };
}
protected:
const Container &container_;
};
class ListIterator : public Iterator<ListContainer, ListIterator>
{
public:
using value_type = const YamlObject &;
using pointer = const YamlObject *;
using reference = value_type;
value_type operator*() const
{
return *it_->get();
}
pointer operator->() const
{
return it_->get();
}
};
class DictIterator : public Iterator<DictContainer, DictIterator>
{
public:
using value_type = std::pair<const std::string &, const YamlObject &>;
using pointer = value_type *;
using reference = value_type &;
value_type operator*() const
{
return { it_->first, *it_->second.get() };
}
};
class DictAdapter : public Adapter<DictContainer, DictIterator>
{
public:
using key_type = std::string;
};
class ListAdapter : public Adapter<ListContainer, ListIterator>
{
};
#endif /* __DOXYGEN__ */
YamlObject();
~YamlObject();
bool isValue() const
{
return type_ == Type::Value;
}
bool isList() const
{
return type_ == Type::List;
}
bool isDictionary() const
{
return type_ == Type::Dictionary;
}
std::size_t size() const;
#ifndef __DOXYGEN__
template<typename T,
typename std::enable_if_t<
std::is_same_v<bool, T> ||
std::is_same_v<double, T> ||
std::is_same_v<int32_t, T> ||
std::is_same_v<uint32_t, T> ||
std::is_same_v<std::string, T> ||
std::is_same_v<Size, T>> * = nullptr>
#else
template<typename T>
#endif
T get(const T &defaultValue, bool *ok = nullptr) const;
DictAdapter asDict() const { return DictAdapter{ dictionary_ }; }
ListAdapter asList() const { return ListAdapter{ list_ }; }
const YamlObject &operator[](std::size_t index) const;
bool contains(const std::string &key) const;
const YamlObject &operator[](const std::string &key) const;
private:
LIBCAMERA_DISABLE_COPY_AND_MOVE(YamlObject)
friend class YamlParserContext;
enum class Type {
Dictionary,
List,
Value,
};
Type type_;
std::string value_;
ListContainer list_;
DictContainer dictionary_;
};
class YamlParser final
{
public:
static std::unique_ptr<YamlObject> parse(File &file);
};
} /* namespace libcamera */
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