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// **************************************************************************
// * This file is part of the zenXML project. It is distributed under the *
// * Boost Software License: http://www.boost.org/LICENSE_1_0.txt *
// * Copyright (C) Zenju (zenju AT gmx DOT de) - All Rights Reserved *
// **************************************************************************
#ifndef ZEN_XML_CONVERT_STRUC_HEADER_018727409908342709743
#define ZEN_XML_CONVERT_STRUC_HEADER_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>
struct IsStlContainer :
StaticBool<
impl_2384343::HasMemberType_value_type <T>::value &&
impl_2384343::HasMemberType_iterator <T>::value &&
impl_2384343::HasMemberType_const_iterator<T>::value &&
impl_2384343::HasMember_begin <T>::value &&
impl_2384343::HasMember_end <T>::value &&
impl_2384343::HasMember_insert <T>::value> {};
namespace impl_2384343
{
ZEN_INIT_DETECT_MEMBER_TYPE(first_type);
ZEN_INIT_DETECT_MEMBER_TYPE(second_type);
ZEN_INIT_DETECT_MEMBER(first) //we don't know the exact declaration of the member attribute: may be in a base class!
ZEN_INIT_DETECT_MEMBER(second) //
}
template <typename T>
struct IsStlPair :
StaticBool<
impl_2384343::HasMemberType_first_type <T>::value &&
impl_2384343::HasMemberType_second_type<T>::value &&
impl_2384343::HasMember_first <T>::value &&
impl_2384343::HasMember_second <T>::value> {};
//######################################################################################
//Conversion from arbitrary types to an XML element
enum ValueType
{
VALUE_TYPE_STL_CONTAINER,
VALUE_TYPE_STL_PAIR,
VALUE_TYPE_OTHER,
};
template <class T>
struct GetValueType : StaticEnum<ValueType,
GetTextType<T>::value != TEXT_TYPE_OTHER ? VALUE_TYPE_OTHER : //some string classes are also STL containers, so check this first
IsStlContainer<T>::value ? VALUE_TYPE_STL_CONTAINER :
IsStlPair<T>::value ? VALUE_TYPE_STL_PAIR :
VALUE_TYPE_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, VALUE_TYPE_STL_CONTAINER>
{
void writeStruc(const T& value, XmlElement& output) const
{
std::for_each(value.begin(), value.end(),
[&](const typename T::value_type & childVal)
{
XmlElement& newChild = output.addChild("Item");
zen::writeStruc(childVal, newChild);
});
}
bool readStruc(const XmlElement& input, T& value) const
{
bool success = true;
value.clear();
auto iterPair = input.getChildren("Item");
for (auto iter = iterPair.first; iter != iterPair.second; ++iter)
{
typename T::value_type childVal; //MSVC 2010 bug: cannot put this into a lambda body
if (zen::readStruc(*iter, childVal))
value.insert(value.end(), childVal);
else
success = false;
}
return success;
}
};
//partial specialization: handle conversion for std::pair
template <class T>
struct ConvertElement<T, VALUE_TYPE_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, VALUE_TYPE_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 //ZEN_XML_CONVERT_STRUC_HEADER_018727409908342709743
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