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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::HasMemberTypeV_value_type <T> &&
impl_2384343::HasMemberTypeV_iterator <T> &&
impl_2384343::HasMemberTypeV_const_iterator<T> &&
impl_2384343::HasMemberV_begin <T> &&
impl_2384343::HasMemberV_end <T> &&
impl_2384343::HasMemberV_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
{
STL_CONTAINER,
STL_PAIR,
OTHER,
};
template <class T>
using GetValueType = std::integral_constant<ValueType,
GetTextType <T>::value != TEXT_TYPE_OTHER ? ValueType::OTHER : //some string classes are also STL containers, so check this first
IsStlContainer<T>::value ? ValueType::STL_CONTAINER :
IsStlPair <T>::value ? ValueType::STL_PAIR :
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::STL_CONTAINER>
{
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
{
bool success = true;
value.clear();
auto itPair = input.getChildren("Item");
for (auto it = itPair.first; it != itPair.second; ++it)
{
typename T::value_type childVal; //MSVC 2010 bug: cannot put this into a lambda body
if (zen::readStruc(*it, childVal))
value.insert(value.end(), 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::STL_PAIR>
{
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(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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