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/*
* Xml.h
*
* Created on: 11 Feb 2018
* Author: jeremy
*/
#ifndef SOURCE_UTIL_XML_H_
#define SOURCE_UTIL_XML_H_
#include <tinyxml2.h>
#include <sstream>
#include <string>
#include <vector>
namespace Util
{
/**
* Xml Element wrapper, very useful for range-based for loops.
*/
class XmlElement
{
public:
XmlElement(tinyxml2::XMLElement* element_, const std::string& name_) : element{element_}, name{name_} {}
XmlElement(tinyxml2::XMLElement* element_) : element{element_}, name{} {}
inline XmlElement begin() const
{
if(name.empty())
{
return XmlElement{element->FirstChildElement()};
}
return XmlElement{element->FirstChildElement(name.data())};
}
inline XmlElement end() const
{
return XmlElement{nullptr};
}
inline XmlElement operator++()
{
if(name.empty())
{
element = element->NextSiblingElement();
}
else
{
element = element->NextSiblingElement(name.data());
}
return *this;
}
inline XmlElement operator*() const
{
return *this;
}
inline bool operator!=(const XmlElement& xe) const
{
return element != xe.element;
}
inline const char* GetText() const
{
return element->GetText();
}
template <typename T>
inline bool GetValue(T& value) const
{
if(!element)
{
value = T{};
return false;
}
auto text = element->GetText();
if(text == nullptr)
{
value = T{};
return false;
}
std::istringstream iss{text};
iss >> value;
return true;
}
template <typename T>
inline T GetValue() const
{
T value{};
GetValue(value);
return value;
}
template <typename T>
inline void Attribute(const std::string& name, T& value) const
{
auto attr = element->Attribute(name.data());
if(attr == nullptr)
{
return;
}
std::istringstream iss{attr};
iss >> value;
}
template <typename T>
inline T Attribute(const std::string& name) const
{
T value{};
Attribute<T>(name, value);
return value;
}
inline XmlElement FirstChildElement(const std::string& childName) const
{
return XmlElement{element->FirstChildElement(childName.data())};
}
private:
tinyxml2::XMLElement* element;
std::string name;
};
/**
* Structure that holds an xml attribute: a name and a value.
*/
struct XmlAttr
{
template <typename T>
XmlAttr(std::string name_, const T& val) : name(std::move(name_))
{
std::ostringstream oss;
oss << val;
value = oss.str();
}
std::string name;
std::string value;
};
/**
* Creates a new xml element.
* @param doc Xml document in which the xml element is to be inserted.
* @param name Tag name of the xml element.
* @param text Contents.
* @param attributes Xml attributes.
* @return
*/
template <typename T = std::string>
tinyxml2::XMLElement* CreateXmlElement(tinyxml2::XMLDocument& doc, const std::string name, const T& text = "", const std::vector<XmlAttr>& attributes = {})
{
namespace xml = tinyxml2;
xml::XMLElement* element = doc.NewElement(name.data());
std::ostringstream oss;
oss << text;
if(!oss.str().empty())
{
element->SetText(oss.str().data());
}
for(const auto& itAttr : attributes)
{
element->SetAttribute(itAttr.name.data(), itAttr.value.data());
}
return element;
}
}
#endif /* SOURCE_UTIL_XML_H_ */
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