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#pragma once
#include "base/logging.hpp"
#if defined(__clang__)
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wunused-parameter"
#endif
#define XML_STATIC
#include "3party/expat/expat_impl.h"
#if defined(__clang__)
#pragma clang diagnostic pop
#endif
template <typename DispatcherT>
class XmlParser : public CExpatImpl< XmlParser<DispatcherT> >
{
typedef CExpatImpl< XmlParser<DispatcherT> > BaseT;
public:
XmlParser(DispatcherT & dispatcher, bool enableCharHandler = false)
: m_depth(0), m_restrictDepth(static_cast<size_t>(-1)), m_dispatcher(dispatcher),
m_enableCharHandler(enableCharHandler)
{
}
// Invoked by CExpatImpl after the parser is created
void OnPostCreate()
{
// Enable all the event routines we want
BaseT::EnableElementHandler();
if (m_enableCharHandler)
BaseT::EnableCharacterDataHandler();
}
// Start element handler
void OnStartElement(XML_Char const * pszName, XML_Char const ** papszAttrs)
{
CheckCharData();
++m_depth;
if (m_depth >= m_restrictDepth)
return;
if (!m_dispatcher.Push(pszName))
{
m_restrictDepth = m_depth;
return;
}
for (size_t i = 0; papszAttrs[2 * i]; ++i)
m_dispatcher.AddAttr(papszAttrs[2 * i], papszAttrs[2 * i + 1]);
}
// End element handler
void OnEndElement(XML_Char const * pszName)
{
CheckCharData();
--m_depth;
if (m_depth >= m_restrictDepth)
return;
if (m_restrictDepth != size_t(-1))
m_restrictDepth = static_cast<size_t>(-1);
else
m_dispatcher.Pop(std::string(pszName));
}
void OnCharacterData(XML_Char const * pszData, int nLength)
{
// Accumulate character data - it can be passed by parts
// (when reading from fixed length buffer).
m_charData.append(pszData, nLength);
}
void PrintError()
{
if (BaseT::GetErrorCode() != XML_ERROR_NONE)
{
LOG(LDEBUG, ("XML parse error at line",
BaseT::GetCurrentLineNumber(),
"and byte", BaseT::GetCurrentByteIndex()));
}
}
private:
size_t m_depth;
size_t m_restrictDepth;
DispatcherT & m_dispatcher;
std::string m_charData;
bool m_enableCharHandler;
void CheckCharData()
{
if (m_enableCharHandler && !m_charData.empty())
{
m_dispatcher.CharData(m_charData);
m_charData.clear();
}
}
};
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