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// *****************************************************************************
// * This file is part of the FreeFileSync project. It is distributed under *
// * GNU General Public License: https://www.gnu.org/licenses/gpl-3.0 *
// * Copyright (C) Zenju (zenju AT freefilesync DOT org) - All Rights Reserved *
// *****************************************************************************
#ifndef CVRT_STRUC_H_018727409908342709743
#define CVRT_STRUC_H_018727409908342709743
#include "dom.h"
namespace zen
{
/**
\file
\brief Handle conversion of arbitrary types to and from XML elements.
See comments in cvrt_text.h
*/
///Convert XML element to structured user data
/**
\param input The input XML element.
\param value Conversion target value.
\return "true" if value was read successfully.
*/
template <class T> bool readStruc(const XmlElement& input, T& value);
///Convert structured user data into an XML element
/**
\param value The value to be converted.
\param output The output XML element.
*/
template <class T> void writeStruc(const T& value, XmlElement& output);
//------------------------------ implementation -------------------------------------
namespace impl_2384343
{
ZEN_INIT_DETECT_MEMBER_TYPE(value_type)
ZEN_INIT_DETECT_MEMBER_TYPE(iterator)
ZEN_INIT_DETECT_MEMBER_TYPE(const_iterator)
ZEN_INIT_DETECT_MEMBER(begin) //
ZEN_INIT_DETECT_MEMBER(end) //we don't know the exact declaration of the member attribute: may be in a base class!
ZEN_INIT_DETECT_MEMBER(insert) //
}
template <typename T>
using IsStlContainer = std::bool_constant<
impl_2384343::hasMemberType_value_type <T>&&
impl_2384343::hasMemberType_iterator <T>&&
impl_2384343::hasMemberType_const_iterator<T>&&
impl_2384343::hasMember_begin <T>&&
impl_2384343::hasMember_end <T>&&
impl_2384343::hasMember_insert <T>>;
template <class T>
struct IsStlPair
{
private:
using Yes = char[1];
using No = char[2];
template <class T1, class T2>
static Yes& isPair(const std::pair<T1, T2>&);
static No& isPair(...);
public:
enum { value = sizeof(isPair(std::declval<T>())) == sizeof(Yes) };
};
//######################################################################################
//Conversion from arbitrary types to an XML element
enum class ValueType
{
stlContainer,
stlPair,
other,
};
template <class T>
using GetValueType = std::integral_constant<ValueType,
GetTextType <T>::value != TextType::other ? ValueType::other : //some string classes are also STL containers, so check this first
IsStlContainer<T>::value ? ValueType::stlContainer :
IsStlPair <T>::value ? ValueType::stlPair :
ValueType::other>;
template <class T, ValueType type>
struct ConvertElement;
/* -> expected interface
{
void writeStruc(const T& value, XmlElement& output) const;
bool readStruc(const XmlElement& input, T& value) const;
};
*/
//partial specialization: handle conversion for all STL-container types!
template <class T>
struct ConvertElement<T, ValueType::stlContainer>
{
void writeStruc(const T& value, XmlElement& output) const
{
for (const typename T::value_type& childVal : value)
{
XmlElement& newChild = output.addChild("Item");
zen::writeStruc(childVal, newChild);
}
}
bool readStruc(const XmlElement& input, T& value) const
{
value.clear();
bool success = true;
auto [it, itEnd] = input.getChildren();
std::for_each(it, itEnd, [&](const XmlElement& xmlChild)
{
typename T::value_type childVal;
if (zen::readStruc(xmlChild, childVal))
value.insert(value.end(), std::move(childVal));
else
success = false;
//should we support insertion of partially-loaded struct??
});
return success;
}
};
//partial specialization: handle conversion for std::pair
template <class T>
struct ConvertElement<T, ValueType::stlPair>
{
void writeStruc(const T& value, XmlElement& output) const
{
XmlElement& child1 = output.addChild("one"); //don't use "1st/2nd", this will confuse a few pedantic XML parsers
zen::writeStruc(value.first, child1);
XmlElement& child2 = output.addChild("two");
zen::writeStruc(value.second, child2);
}
bool readStruc(const XmlElement& input, T& value) const
{
bool success = true;
const XmlElement* child1 = input.getChild("one");
if (!child1 || !zen::readStruc(*child1, value.first))
success = false;
const XmlElement* child2 = input.getChild("two");
if (!child2 || !zen::readStruc(*child2, value.second))
success = false;
return success;
}
};
//partial specialization: not a pure structured type, try text conversion (thereby respect user specializations of writeText()/readText())
template <class T>
struct ConvertElement<T, ValueType::other>
{
void writeStruc(const T& value, XmlElement& output) const
{
std::string tmp;
writeText(value, tmp);
output.setValue(std::move(tmp));
}
bool readStruc(const XmlElement& input, T& value) const
{
std::string rawStr;
input.getValue(rawStr);
return readText(rawStr, value);
}
};
template <class T> inline
void writeStruc(const T& value, XmlElement& output)
{
ConvertElement<T, GetValueType<T>::value>().writeStruc(value, output);
}
template <class T> inline
bool readStruc(const XmlElement& input, T& value)
{
return ConvertElement<T, GetValueType<T>::value>().readStruc(input, value);
}
}
#endif //CVRT_STRUC_H_018727409908342709743
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