710 lines
16 KiB
C++
710 lines
16 KiB
C++
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// XMLParser.h
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// Interfaces to the CXMLParser class representing the base class for XML parsing
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// To use, derive a class from this base and override its OnStartElement(), OnEndElement() and OnCharacters() functions
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#pragma once
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#include "expat/expat.h"
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class CXMLParser
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{
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public:
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CXMLParser(void);
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virtual ~CXMLParser();
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// The actual parsing, may be called several times; the last time needs iIsFinal == true (-> flush)
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int Parse(const char * iData, size_t iLength, bool iIsFinal = false);
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private:
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// LibExpat stuff:
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XML_Parser mParser;
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static void StartElementHandler(void * iContext, const XML_Char * iElement, const XML_Char ** iAttributes)
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{
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((CXMLParser *)iContext)->OnStartElement(iElement, iAttributes);
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}
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static void EndElementHandler (void * iContext, const XML_Char * iElement)
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{
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((CXMLParser *)iContext)->OnEndElement(iElement);
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}
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static void CharacterDataHandler (void * iContext, const XML_Char * iData, int iLength)
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{
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((CXMLParser *)iContext)->OnCharacters(iData, iLength);
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}
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protected:
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virtual void OnStartElement(const XML_Char * iElement, const XML_Char ** iAttributes) = 0;
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virtual void OnEndElement (const XML_Char * iElement) = 0;
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virtual void OnCharacters (const XML_Char * iCharacters, int iLength) = 0;
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} ;
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////////////////////////////////////////////////////////////////////////////////
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// The following template has been modified from code available at
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// https://www.codeproject.com/Articles/1847/C-Wrappers-for-the-Expat-XML-Parser
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// It uses templates to remove the virtual function call penalty (both size and speed) for each callback
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/* Usage:
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1, Declare a subclass:
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class CMyParser : public CExpatImpl<CMyParser>
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2, Declare handlers that you want in that subclass:
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void CMyParser::OnEndElement(const XML_Char * iTagName);
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3, Create an instance of your class:
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CMyParser Parser;
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4, Call Create():
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Parser.Create(nullptr, nullptr);
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4, Call Parse(), repeatedly:
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Parser.Parse(Buffer, Length);
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*/
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template <class _T>
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class CExpatImpl
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{
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// @access Constructors and destructors
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public:
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// @cmember General constructor
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CExpatImpl ()
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{
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m_p = nullptr;
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}
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// @cmember Destructor
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~CExpatImpl ()
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{
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Destroy ();
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}
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// @access Parser creation and deletion methods
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public:
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// @cmember Create a parser
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bool Create (const XML_Char * pszEncoding = nullptr, const XML_Char * pszSep = nullptr)
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{
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// Destroy the old parser
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Destroy ();
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// If the encoding or seperator are empty, then nullptr
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if ((pszEncoding != nullptr) && (pszEncoding[0] == 0))
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{
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pszEncoding = nullptr;
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}
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if ((pszSep != nullptr) && (pszSep[0] == 0))
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{
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pszSep = nullptr;
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}
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// Create the new parser
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m_p = XML_ParserCreate_MM (pszEncoding, nullptr, pszSep);
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if (m_p == nullptr)
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{
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return false;
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}
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// Invoke the post create routine
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_T * pThis = static_cast <_T *> (this);
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pThis ->OnPostCreate ();
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// Set the user data used in callbacks
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XML_SetUserData (m_p, (void *) this);
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return true;
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}
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// @cmember Destroy the parser
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void Destroy (void)
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{
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if (m_p != nullptr)
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{
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XML_ParserFree (m_p);
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}
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m_p = nullptr;
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}
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// @cmember Parse a block of data
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bool Parse (const char *pszBuffer, int nLength, bool fIsFinal = true)
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{
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assert (m_p != nullptr);
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return (XML_Parse (m_p, pszBuffer, nLength, fIsFinal) != 0);
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}
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// @cmember Parse internal buffer
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bool ParseBuffer (int nLength, bool fIsFinal = true)
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{
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assert (m_p != nullptr);
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return XML_ParseBuffer (m_p, nLength, fIsFinal) != 0;
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}
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// @cmember Get the internal buffer
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void *GetBuffer (int nLength)
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{
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assert (m_p != nullptr);
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return XML_GetBuffer (m_p, nLength);
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}
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protected:
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// Parser callback enable / disable methods:
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// @cmember Enable / Disable the start element handler
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void EnableStartElementHandler (bool fEnable = true)
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{
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assert (m_p != nullptr);
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XML_SetStartElementHandler (m_p, fEnable ? StartElementHandler : nullptr);
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}
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// @cmember Enable / Disable the end element handler
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void EnableEndElementHandler (bool fEnable = true)
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{
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assert (m_p != nullptr);
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XML_SetEndElementHandler (m_p, fEnable ? EndElementHandler : nullptr);
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}
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// @cmember Enable / Disable the element handlers
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void EnableElementHandler (bool fEnable = true)
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{
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assert (m_p != nullptr);
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EnableStartElementHandler (fEnable);
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EnableEndElementHandler (fEnable);
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}
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// @cmember Enable / Disable the character data handler
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void EnableCharacterDataHandler (bool fEnable = true)
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{
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assert (m_p != nullptr);
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XML_SetCharacterDataHandler (m_p, fEnable ? CharacterDataHandler : nullptr);
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}
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// @cmember Enable / Disable the processing instruction handler
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void EnableProcessingInstructionHandler (bool fEnable = true)
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{
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assert (m_p != nullptr);
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XML_SetProcessingInstructionHandler (m_p, fEnable ? ProcessingInstructionHandler : nullptr);
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}
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// @cmember Enable / Disable the comment handler
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void EnableCommentHandler (bool fEnable = true)
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{
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assert (m_p != nullptr);
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XML_SetCommentHandler (m_p, fEnable ? CommentHandler : nullptr);
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}
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// @cmember Enable / Disable the start CDATA section handler
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void EnableStartCdataSectionHandler (bool fEnable = true)
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{
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assert (m_p != nullptr);
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XML_SetStartCdataSectionHandler (m_p, fEnable ? StartCdataSectionHandler : nullptr);
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}
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// @cmember Enable / Disable the end CDATA section handler
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void EnableEndCdataSectionHandler (bool fEnable = true)
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{
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assert (m_p != nullptr);
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XML_SetEndCdataSectionHandler (m_p, fEnable ? EndCdataSectionHandler : nullptr);
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}
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// @cmember Enable / Disable the CDATA section handlers
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void EnableCdataSectionHandler (bool fEnable = true)
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{
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assert (m_p != nullptr);
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EnableStartCdataSectionHandler (fEnable);
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EnableEndCdataSectionHandler (fEnable);
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}
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// @cmember Enable / Disable default handler
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void EnableDefaultHandler (bool fEnable = true, bool fExpand = true)
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{
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assert (m_p != nullptr);
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if (fExpand)
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{
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XML_SetDefaultHandlerExpand (m_p, fEnable ? DefaultHandler : nullptr);
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}
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else
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{
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XML_SetDefaultHandler (m_p, fEnable ? DefaultHandler : nullptr);
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}
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}
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// @cmember Enable / Disable external entity ref handler
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void EnableExternalEntityRefHandler (bool fEnable = true)
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{
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assert (m_p != nullptr);
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XML_SetExternalEntityRefHandler (m_p, fEnable ? ExternalEntityRefHandler : nullptr);
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}
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// @cmember Enable / Disable unknown encoding handler
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void EnableUnknownEncodingHandler (bool fEnable = true)
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{
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assert (m_p != nullptr);
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XML_SetUnknownEncodingHandler (m_p, fEnable ? UnknownEncodingHandler : nullptr);
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}
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// @cmember Enable / Disable start namespace handler
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void EnableStartNamespaceDeclHandler (bool fEnable = true)
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{
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assert (m_p != nullptr);
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XML_SetStartNamespaceDeclHandler (m_p, fEnable ? StartNamespaceDeclHandler : nullptr);
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}
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// @cmember Enable / Disable end namespace handler
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void EnableEndNamespaceDeclHandler (bool fEnable = true)
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{
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assert (m_p != nullptr);
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XML_SetEndNamespaceDeclHandler (m_p, fEnable ? EndNamespaceDeclHandler : nullptr);
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}
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// @cmember Enable / Disable namespace handlers
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void EnableNamespaceDeclHandler (bool fEnable = true)
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{
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EnableStartNamespaceDeclHandler (fEnable);
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EnableEndNamespaceDeclHandler (fEnable);
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}
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// @cmember Enable / Disable the XML declaration handler
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void EnableXmlDeclHandler (bool fEnable = true)
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{
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assert (m_p != nullptr);
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XML_SetXmlDeclHandler (m_p, fEnable ? XmlDeclHandler : nullptr);
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}
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// @cmember Enable / Disable the start DOCTYPE declaration handler
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void EnableStartDoctypeDeclHandler (bool fEnable = true)
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{
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assert (m_p != nullptr);
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XML_SetStartDoctypeDeclHandler (m_p, fEnable ? StartDoctypeDeclHandler : nullptr);
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}
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// @cmember Enable / Disable the end DOCTYPE declaration handler
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void EnableEndDoctypeDeclHandler (bool fEnable = true)
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{
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assert (m_p != nullptr);
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XML_SetEndDoctypeDeclHandler (m_p,
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fEnable ? EndDoctypeDeclHandler : nullptr);
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}
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// @cmember Enable / Disable the DOCTYPE declaration handler
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void EnableDoctypeDeclHandler (bool fEnable = true)
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{
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assert (m_p != nullptr);
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EnableStartDoctypeDeclHandler (fEnable);
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EnableEndDoctypeDeclHandler (fEnable);
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}
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public:
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// Parser error reporting methods
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// @cmember Get last error
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enum XML_Error GetErrorCode ()
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{
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assert (m_p != nullptr);
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return XML_GetErrorCode (m_p);
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}
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// @cmember Get the current byte index
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long GetCurrentByteIndex ()
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{
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assert (m_p != nullptr);
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return XML_GetCurrentByteIndex (m_p);
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}
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// @cmember Get the current line number
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int GetCurrentLineNumber ()
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{
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assert (m_p != nullptr);
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return XML_GetCurrentLineNumber (m_p);
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}
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// @cmember Get the current column number
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int GetCurrentColumnNumber ()
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{
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assert (m_p != nullptr);
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return XML_GetCurrentColumnNumber (m_p);
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}
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// @cmember Get the current byte count
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int GetCurrentByteCount ()
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{
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assert (m_p != nullptr);
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return XML_GetCurrentByteCount (m_p);
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}
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// @cmember Get the input context
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const char *GetInputContext (int *pnOffset, int *pnSize)
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{
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assert (m_p != nullptr);
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return XML_GetInputContext (m_p, pnOffset, pnSize);
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}
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// @cmember Get last error string
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const XML_LChar *GetErrorString ()
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{
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return XML_ErrorString (GetErrorCode ());
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}
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// @cmember Return the version string
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static const XML_LChar *GetExpatVersion ()
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{
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return XML_ExpatVersion ();
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}
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// @cmember Get the version information
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static void GetExpatVersion (int *pnMajor, int *pnMinor, int *pnMicro)
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{
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XML_expat_version v = XML_ExpatVersionInfo ();
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if (pnMajor)
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{
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*pnMajor = v .major;
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}
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if (pnMinor)
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{
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*pnMinor = v .minor;
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}
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if (pnMicro)
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{
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*pnMicro = v .micro;
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}
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}
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// @cmember Get last error string
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static const XML_LChar *GetErrorString (enum XML_Error nError)
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{
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return XML_ErrorString (nError);
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}
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// Public handler methods:
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// The template parameter should provide their own implementation for those handlers that they want
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// @cmember Start element handler
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void OnStartElement (const XML_Char *pszName, const XML_Char **papszAttrs)
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{
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return;
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}
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// @cmember End element handler
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void OnEndElement (const XML_Char *pszName)
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{
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return;
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}
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// @cmember Character data handler
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void OnCharacterData (const XML_Char *pszData, int nLength)
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{
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return;
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}
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// @cmember Processing instruction handler
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void OnProcessingInstruction (const XML_Char *pszTarget,
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const XML_Char *pszData)
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{
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return;
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}
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// @cmember Comment handler
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void OnComment (const XML_Char *pszData)
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{
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return;
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}
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// @cmember Start CDATA section handler
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void OnStartCdataSection ()
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{
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return;
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}
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// @cmember End CDATA section handler
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void OnEndCdataSection ()
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{
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return;
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}
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// @cmember Default handler
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void OnDefault (const XML_Char *pszData, int nLength)
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{
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return;
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}
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// @cmember External entity ref handler
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bool OnExternalEntityRef (const XML_Char *pszContext,
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const XML_Char *pszBase, const XML_Char *pszSystemID,
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const XML_Char *pszPublicID)
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{
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return false;
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}
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// @cmember Unknown encoding handler
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bool OnUnknownEncoding (const XML_Char *pszName, XML_Encoding *pInfo)
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{
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return false;
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}
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// @cmember Start namespace declaration handler
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void OnStartNamespaceDecl (const XML_Char *pszPrefix,
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const XML_Char *pszURI)
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{
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return;
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}
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// @cmember End namespace declaration handler
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void OnEndNamespaceDecl (const XML_Char *pszPrefix)
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{
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return;
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}
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// @cmember XML declaration handler
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void OnXmlDecl (const XML_Char *pszVersion, const XML_Char *pszEncoding,
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bool fStandalone)
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{
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return;
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}
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// @cmember Start DOCTYPE declaration handler
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void OnStartDoctypeDecl (const XML_Char *pszDoctypeName,
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const XML_Char *pszSysID, const XML_Char *pszPubID,
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bool fHasInternalSubset)
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{
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return;
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}
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// @cmember End DOCTYPE declaration handler
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void OnEndDoctypeDecl ()
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{
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return;
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}
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// @access Protected methods
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protected:
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// @cmember Handle any post creation
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void OnPostCreate ()
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{
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}
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// @access Protected static methods
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protected:
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// @cmember Start element handler wrapper
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static void __cdecl StartElementHandler (void *pUserData,
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const XML_Char *pszName, const XML_Char **papszAttrs)
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{
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_T *pThis = static_cast <_T *> ((CExpatImpl <_T> *) pUserData);
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pThis ->OnStartElement (pszName, papszAttrs);
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}
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// @cmember End element handler wrapper
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static void __cdecl EndElementHandler (void *pUserData,
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const XML_Char *pszName)
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{
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_T *pThis = static_cast <_T *> ((CExpatImpl <_T> *) pUserData);
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pThis ->OnEndElement (pszName);
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}
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// @cmember Character data handler wrapper
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static void __cdecl CharacterDataHandler (void *pUserData,
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const XML_Char *pszData, int nLength)
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{
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_T *pThis = static_cast <_T *> ((CExpatImpl <_T> *) pUserData);
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pThis ->OnCharacterData (pszData, nLength);
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}
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// @cmember Processing instruction handler wrapper
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static void __cdecl ProcessingInstructionHandler (void *pUserData,
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const XML_Char *pszTarget, const XML_Char *pszData)
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{
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_T *pThis = static_cast <_T *> ((CExpatImpl <_T> *) pUserData);
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pThis ->OnProcessingInstruction (pszTarget, pszData);
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}
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// @cmember Comment handler wrapper
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static void __cdecl CommentHandler (void *pUserData,
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const XML_Char *pszData)
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{
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_T *pThis = static_cast <_T *> ((CExpatImpl <_T> *) pUserData);
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pThis ->OnComment (pszData);
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}
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// @cmember Start CDATA section wrapper
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static void __cdecl StartCdataSectionHandler (void *pUserData)
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{
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_T *pThis = static_cast <_T *> ((CExpatImpl <_T> *) pUserData);
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pThis ->OnStartCdataSection ();
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}
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// @cmember End CDATA section wrapper
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static void __cdecl EndCdataSectionHandler (void *pUserData)
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{
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_T *pThis = static_cast <_T *> ((CExpatImpl <_T> *) pUserData);
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pThis ->OnEndCdataSection ();
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}
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|
|
|
// @cmember Default wrapper
|
|
|
|
static void __cdecl DefaultHandler (void *pUserData,
|
|
const XML_Char *pszData, int nLength)
|
|
{
|
|
_T *pThis = static_cast <_T *> ((CExpatImpl <_T> *) pUserData);
|
|
pThis ->OnDefault (pszData, nLength);
|
|
}
|
|
|
|
// @cmember External entity ref wrapper
|
|
|
|
static int __cdecl ExternalEntityRefHandler (void *pUserData,
|
|
const XML_Char *pszContext, const XML_Char *pszBase,
|
|
const XML_Char *pszSystemID, const XML_Char *pszPublicID)
|
|
{
|
|
_T *pThis = static_cast <_T *> ((CExpatImpl <_T> *) pUserData);
|
|
return pThis ->OnExternalEntityRef (pszContext,
|
|
pszBase, pszSystemID, pszPublicID) ? 1 : 0;
|
|
}
|
|
|
|
// @cmember Unknown encoding wrapper
|
|
|
|
static int __cdecl UnknownEncodingHandler (void * pUserData, const XML_Char * pszName, XML_Encoding * pInfo)
|
|
{
|
|
_T *pThis = static_cast <_T *> ((CExpatImpl <_T> *) pUserData);
|
|
return pThis ->OnUnknownEncoding (pszName, pInfo) ? 1 : 0;
|
|
}
|
|
|
|
// @cmember Start namespace decl wrapper
|
|
|
|
static void __cdecl StartNamespaceDeclHandler (void * pUserData, const XML_Char * pszPrefix, const XML_Char * pszURI)
|
|
{
|
|
_T *pThis = static_cast <_T *> ((CExpatImpl <_T> *) pUserData);
|
|
pThis ->OnStartNamespaceDecl (pszPrefix, pszURI);
|
|
}
|
|
|
|
// @cmember End namespace decl wrapper
|
|
|
|
static void __cdecl EndNamespaceDeclHandler (void * pUserData, const XML_Char * pszPrefix)
|
|
{
|
|
_T *pThis = static_cast <_T *> ((CExpatImpl <_T> *) pUserData);
|
|
pThis ->OnEndNamespaceDecl (pszPrefix);
|
|
}
|
|
|
|
// @cmember XML declaration wrapper
|
|
|
|
static void __cdecl XmlDeclHandler (void *pUserData, const XML_Char *pszVersion, const XML_Char *pszEncoding, int nStandalone)
|
|
{
|
|
_T *pThis = static_cast <_T *> ((CExpatImpl <_T> *) pUserData);
|
|
pThis ->OnXmlDecl (pszVersion, pszEncoding, nStandalone != 0);
|
|
}
|
|
|
|
// @cmember Start Doctype declaration wrapper
|
|
|
|
static void __cdecl StartDoctypeDeclHandler (
|
|
void *pUserData, const XML_Char *pszDoctypeName, const XML_Char *pszSysID,
|
|
const XML_Char *pszPubID, int nHasInternalSubset
|
|
)
|
|
{
|
|
_T *pThis = static_cast <_T *> ((CExpatImpl <_T> *) pUserData);
|
|
pThis ->OnStartDoctypeDecl (pszDoctypeName, pszSysID,
|
|
pszPubID, nHasInternalSubset != 0);
|
|
}
|
|
|
|
// @cmember End Doctype declaration wrapper
|
|
|
|
static void __cdecl EndDoctypeDeclHandler (void *pUserData)
|
|
{
|
|
_T *pThis = static_cast <_T *> ((CExpatImpl <_T> *) pUserData);
|
|
pThis ->OnEndDoctypeDecl ();
|
|
}
|
|
|
|
|
|
protected:
|
|
|
|
XML_Parser m_p;
|
|
|
|
/** Returns the value of the specified attribute, if found; nullptr otherwise */
|
|
static const XML_Char * FindAttr(const XML_Char ** iAttrs, const XML_Char * iAttrToFind)
|
|
{
|
|
for (const XML_Char ** Attr = iAttrs; *Attr != nullptr; Attr += 2)
|
|
{
|
|
if (strcmp(*Attr, iAttrToFind) == 0)
|
|
{
|
|
return *(Attr + 1);
|
|
}
|
|
} // for Attr - iAttrs[]
|
|
return nullptr;
|
|
}
|
|
} ;
|
|
|
|
|
|
|
|
|