tinyxml.h

otl简单包装实现类,对数据库进行操作的,简单易用.

	/// Returns a copy of this Comment.
	virtual TiXmlNode* Clone() const;
	/// Write this Comment to a FILE stream.
	virtual void Print( FILE* cfile, int depth ) const;

	/*	Attribtue parsing starts: at the ! of the !--
						 returns: next char past '>'
	*/
	virtual const char* Parse( const char* p, TiXmlParsingData* data, TiXmlEncoding encoding );

protected:
	void CopyTo( TiXmlComment* target ) const;

	// used to be public
	#ifdef TIXML_USE_STL
	    virtual void StreamIn( TIXML_ISTREAM * in, TIXML_STRING * tag );
	#endif
	virtual void StreamOut( TIXML_OSTREAM * out ) const;

private:

};


/** XML text. Contained in an element.
*/
class TiXmlText : public TiXmlNode
{
	friend class TiXmlElement;
public:
	/// Constructor.
	TiXmlText (const char * initValue) : TiXmlNode (TiXmlNode::TEXT)
	{
		SetValue( initValue );
	}
	virtual ~TiXmlText() {}

	#ifdef TIXML_USE_STL
	/// Constructor.
	TiXmlText( const std::string& initValue ) : TiXmlNode (TiXmlNode::TEXT)
	{
		SetValue( initValue );
	}
	#endif

	TiXmlText( const TiXmlText& copy ) : TiXmlNode( TiXmlNode::TEXT )	{ copy.CopyTo( this ); }
	void operator=( const TiXmlText& base )							 	{ base.CopyTo( this ); }

	/// Write this text object to a FILE stream.
	virtual void Print( FILE* cfile, int depth ) const;

	virtual const char* Parse( const char* p, TiXmlParsingData* data, TiXmlEncoding encoding );

protected :
	///  [internal use] Creates a new Element and returns it.
	virtual TiXmlNode* Clone() const;
	void CopyTo( TiXmlText* target ) const;

	virtual void StreamOut ( TIXML_OSTREAM * out ) const;
	bool Blank() const;	// returns true if all white space and new lines
	// [internal use]
	#ifdef TIXML_USE_STL
	    virtual void StreamIn( TIXML_ISTREAM * in, TIXML_STRING * tag );
	#endif

private:
};


/** In correct XML the declaration is the first entry in the file.
	@verbatim
		<?xml version="1.0" standalone="yes"?>
	@endverbatim

	TinyXml will happily read or write files without a declaration,
	however. There are 3 possible attributes to the declaration:
	version, encoding, and standalone.

	Note: In this version of the code, the attributes are
	handled as special cases, not generic attributes, simply
	because there can only be at most 3 and they are always the same.
*/
class TiXmlDeclaration : public TiXmlNode
{
public:
	/// Construct an empty declaration.
	TiXmlDeclaration()   : TiXmlNode( TiXmlNode::DECLARATION ) {}

#ifdef TIXML_USE_STL
	/// Constructor.
	TiXmlDeclaration(	const std::string& _version,
						const std::string& _encoding,
						const std::string& _standalone );
#endif

	/// Construct.
	TiXmlDeclaration(	const char* _version,
						const char* _encoding,
						const char* _standalone );

	TiXmlDeclaration( const TiXmlDeclaration& copy );
	void operator=( const TiXmlDeclaration& copy );

	virtual ~TiXmlDeclaration()	{}

	/// Version. Will return an empty string if none was found.
	const char *Version() const			{ return version.c_str (); }
	/// Encoding. Will return an empty string if none was found.
	const char *Encoding() const		{ return encoding.c_str (); }
	/// Is this a standalone document?
	const char *Standalone() const		{ return standalone.c_str (); }

	/// Creates a copy of this Declaration and returns it.
	virtual TiXmlNode* Clone() const;
	/// Print this declaration to a FILE stream.
	virtual void Print( FILE* cfile, int depth ) const;

	virtual const char* Parse( const char* p, TiXmlParsingData* data, TiXmlEncoding encoding );

protected:
	void CopyTo( TiXmlDeclaration* target ) const;
	// used to be public
	#ifdef TIXML_USE_STL
	    virtual void StreamIn( TIXML_ISTREAM * in, TIXML_STRING * tag );
	#endif
	virtual void StreamOut ( TIXML_OSTREAM * out) const;

private:

	TIXML_STRING version;
	TIXML_STRING encoding;
	TIXML_STRING standalone;
};


/** Any tag that tinyXml doesn't recognize is saved as an
	unknown. It is a tag of text, but should not be modified.
	It will be written back to the XML, unchanged, when the file
	is saved.

	DTD tags get thrown into TiXmlUnknowns.
*/
class TiXmlUnknown : public TiXmlNode
{
public:
	TiXmlUnknown() : TiXmlNode( TiXmlNode::UNKNOWN )	{}
	virtual ~TiXmlUnknown() {}

	TiXmlUnknown( const TiXmlUnknown& copy ) : TiXmlNode( TiXmlNode::UNKNOWN )		{ copy.CopyTo( this ); }
	void operator=( const TiXmlUnknown& copy )										{ copy.CopyTo( this ); }

	/// Creates a copy of this Unknown and returns it.
	virtual TiXmlNode* Clone() const;
	/// Print this Unknown to a FILE stream.
	virtual void Print( FILE* cfile, int depth ) const;

	virtual const char* Parse( const char* p, TiXmlParsingData* data, TiXmlEncoding encoding );

protected:
	void CopyTo( TiXmlUnknown* target ) const;

	#ifdef TIXML_USE_STL
	    virtual void StreamIn( TIXML_ISTREAM * in, TIXML_STRING * tag );
	#endif
	virtual void StreamOut ( TIXML_OSTREAM * out ) const;

private:

};


/** Always the top level node. A document binds together all the
	XML pieces. It can be saved, loaded, and printed to the screen.
	The 'value' of a document node is the xml file name.
*/
class TiXmlDocument : public TiXmlNode
{
public:
	/// Create an empty document, that has no name.
	TiXmlDocument();
	/// Create a document with a name. The name of the document is also the filename of the xml.
	TiXmlDocument( const char * documentName );

	#ifdef TIXML_USE_STL
	/// Constructor.
	TiXmlDocument( const std::string& documentName );
	#endif

	TiXmlDocument( const TiXmlDocument& copy );
	void operator=( const TiXmlDocument& copy );

	virtual ~TiXmlDocument() {}

	/** Load a file using the current document value.
		Returns true if successful. Will delete any existing
		document data before loading.
	*/
	bool LoadFile( TiXmlEncoding encoding = TIXML_DEFAULT_ENCODING );
	/// Save a file using the current document value. Returns true if successful.
	bool SaveFile() const;
	/// Load a file using the given filename. Returns true if successful.
	bool LoadFile( const char * filename, TiXmlEncoding encoding = TIXML_DEFAULT_ENCODING );
	/// Save a file using the given filename. Returns true if successful.
	bool SaveFile( const char * filename ) const;

	#ifdef TIXML_USE_STL
	bool LoadFile( const std::string& filename, TiXmlEncoding encoding = TIXML_DEFAULT_ENCODING )			///< STL std::string version.
	{
		StringToBuffer f( filename );
		return ( f.buffer && LoadFile( f.buffer, encoding ));
	}
	bool SaveFile( const std::string& filename ) const		///< STL std::string version.
	{
		StringToBuffer f( filename );
		return ( f.buffer && SaveFile( f.buffer ));
	}
	#endif

	/** Parse the given null terminated block of xml data. Passing in an encoding to this
		method (either TIXML_ENCODING_LEGACY or TIXML_ENCODING_UTF8 will force TinyXml
		to use that encoding, regardless of what TinyXml might otherwise try to detect.
	*/
	virtual const char* Parse( const char* p, TiXmlParsingData* data = 0, TiXmlEncoding encoding = TIXML_DEFAULT_ENCODING );

	/** Get the root element -- the only top level element -- of the document.
		In well formed XML, there should only be one. TinyXml is tolerant of
		multiple elements at the document level.
	*/
	TiXmlElement* RootElement() const		{ return FirstChildElement(); }

	/** If an error occurs, Error will be set to true. Also,
		- The ErrorId() will contain the integer identifier of the error (not generally useful)
		- The ErrorDesc() method will return the name of the error. (very useful)
		- The ErrorRow() and ErrorCol() will return the location of the error (if known)
	*/	
	bool Error() const						{ return error; }

	/// Contains a textual (english) description of the error if one occurs.
	const char * ErrorDesc() const	{ return errorDesc.c_str (); }

	/** Generally, you probably want the error string ( ErrorDesc() ). But if you
		prefer the ErrorId, this function will fetch it.
	*/
	const int ErrorId()	const				{ return errorId; }

	/** Returns the location (if known) of the error. The first column is column 1, 
		and the first row is row 1. A value of 0 means the row and column wasn't applicable
		(memory errors, for example, have no row/column) or the parser lost the error. (An
		error in the error reporting, in that case.)

		@sa SetTabSize, Row, Column
	*/
	int ErrorRow()	{ return errorLocation.row+1; }
	int ErrorCol()	{ return errorLocation.col+1; }	///< The column where the error occured. See ErrorRow()

	/** By calling this method, with a tab size
		greater than 0, the row and column of each node and attribute is stored
		when the file is loaded. Very useful for tracking the DOM back in to
		the source file.

		The tab size is required for calculating the location of nodes. If not
		set, the default of 4 is used. The tabsize is set per document. Setting
		the tabsize to 0 disables row/column tracking.

		Note that row and column tracking is not supported when using operator>>.

		The tab size needs to be enabled before the parse or load. Correct usage:
		@verbatim
		TiXmlDocument doc;
		doc.SetTabSize( 8 );
		doc.Load( "myfile.xml" );
		@endverbatim

		@sa Row, Column
	*/
	void SetTabSize( int _tabsize )		{ tabsize = _tabsize; }

	int TabSize() const	{ return tabsize; }

	/** If you have handled the error, it can be reset with this call. The error
		state is automatically cleared if you Parse a new XML block.
	*/
	void ClearError()						{	error = false; 
												errorId = 0; 
												errorDesc = ""; 
												errorLocation.row = errorLocation.col = 0; 
												//errorLocation.last = 0; 
											}

	/** Dump the document to standard out. */
	void Print() const						{ Print( stdout, 0 ); }

	/// Print this Document to a FILE stream.
	virtual void Print( FILE* cfile, int depth = 0 ) const;
	// [internal use]
	void SetError( int err, const char* errorLocation, TiXmlParsingData* prevData, TiXmlEncoding encoding );

protected :
	virtual void StreamOut ( TIXML_OSTREAM * out) const;
	// [internal use]
	virtual TiXmlNode* Clone() const;
	#ifdef TIXML_USE_STL
	    virtual void StreamIn( TIXML_ISTREAM * in, TIXML_STRING * tag );
	#endif

private:
	void CopyTo( TiXmlDocument* target ) const;

	bool error;
	int  errorId;
	TIXML_STRING errorDesc;
	int tabsize;
	TiXmlCursor errorLocation;
};


/**
	A TiXmlHandle is a class that wraps a node pointer with null checks; this is
	an incredibly useful thing. Note that TiXmlHandle is not part of the TinyXml
	DOM structure. It is a separate utility class.

	Take an example:
	@verbatim
	<Document>
		<Element attributeA = "valueA">
			<Child attributeB = "value1" />
			<Child attributeB = "value2" />
		</Element>
	<Document>
	@endverbatim

	Assuming you want the value of "attributeB" in the 2nd "Child" element, it's very 
	easy to write a *lot* of code that looks like:

	@verbatim
	TiXmlElement* root = document.FirstChildElement( "Document" );
	if ( root )
	{
		TiXmlElement* element = root->FirstChildElement( "Element" );
		if ( element )
		{
			TiXmlElement* child = element->FirstChildElement( "Child" );
			if ( child )
			{
				TiXmlElement* child2 = child->NextSiblingElement( "Child" );
				if ( child2 )
				{
					// Finally do something useful.
	@endverbatim

	And that doesn't even cover "else" cases. TiXmlHandle addresses the verbosity
	of such code. A TiXmlHandle checks for null	pointers so it is perfectly safe 
	and correct to use:

	@verbatim
	TiXmlHandle docHandle( &document );
	TiXmlElement* child2 = docHandle.FirstChild( "Document" ).FirstChild( "Element" ).Child( "Child", 1 ).Element();
	if ( child2 )
	{
		// do something useful
	@endverbatim

	Which is MUCH more concise and useful.

	It is also safe to copy handles - internally they are nothing more than node pointers.
	@verbatim
	TiXmlHandle handleCopy = handle;
	@endverbatim

	What they should not be used for is iteration:

	@verbatim
	int i=0; 
	while ( true )
	{
		TiXmlElement* child = docHandle.FirstChild( "Document" ).FirstChild( "Element" ).Child( "Child", i ).Element();
		if ( !child )
			break;
		// do something
		++i;
	}
	@endverbatim

	It seems reasonable, but it is in fact two embedded while loops. The Child method is 
	a linear walk to find the element, so this code would iterate much more than it needs 
	to. Instead, prefer:

	@verbatim
	TiXmlElement* child = docHandle.FirstChild( "Document" ).FirstChild( "Element" ).FirstChild( "Child" ).Element();

	for( child; child; child=child->NextSiblingElement() )
	{
		// do something
	}
	@endverbatim
*/
class TiXmlHandle
{
public:
	/// Create a handle from any node (at any depth of the tree.) This can be a null pointer.
	TiXmlHandle( TiXmlNode* node )					{ this->node = node; }
	/// Copy constructor
	TiXmlHandle( const TiXmlHandle& ref )			{ this->node = ref.node; }
	TiXmlHandle operator=( const TiXmlHandle& ref ) { this->node = ref.node; return *this; }

	/// Return a handle to the first child node.
	TiXmlHandle FirstChild() const;
	/// Return a handle to the first child node with the given name.
	TiXmlHandle FirstChild( const char * value ) const;
	/// Return a handle to the first child element.
	TiXmlHandle FirstChildElement() const;
	/// Return a handle to the first child element with the given name.
	TiXmlHandle FirstChildElement( const char * value ) const;

	/** Return a handle to the "index" child with the given name. 
		The first child is 0, the second 1, etc.
	*/
	TiXmlHandle Child( const char* value, int index ) const;
	/** Return a handle to the "index" child. 
		The first child is 0, the second 1, etc.
	*/
	TiXmlHandle Child( int index ) const;
	/** Return a handle to the "index" child element with the given name. 
		The first child element is 0, the second 1, etc. Note that only TiXmlElements
		are indexed: other types are not counted.
	*/
	TiXmlHandle ChildElement( const char* value, int index ) const;
	/** Return a handle to the "index" child element. 
		The first child element is 0, the second 1, etc. Note that only TiXmlElements
		are indexed: other types are not counted.
	*/
	TiXmlHandle ChildElement( int index ) const;

	#ifdef TIXML_USE_STL
	TiXmlHandle FirstChild( const std::string& _value ) const				{ return FirstChild( _value.c_str() ); }
	TiXmlHandle FirstChildElement( const std::string& _value ) const		{ return FirstChildElement( _value.c_str() ); }

	TiXmlHandle Child( const std::string& _value, int index ) const			{ return Child( _value.c_str(), index ); }
	TiXmlHandle ChildElement( const std::string& _value, int index ) const	{ return ChildElement( _value.c_str(), index ); }
	#endif

	/// Return the handle as a TiXmlNode. This may return null.
	TiXmlNode* Node() const			{ return node; } 
	/// Return the handle as a TiXmlElement. This may return null.
	TiXmlElement* Element() const	{ return ( ( node && node->ToElement() ) ? node->ToElement() : 0 ); }
	/// Return the handle as a TiXmlText. This may return null.
	TiXmlText* Text() const			{ return ( ( node && node->ToText() ) ? node->ToText() : 0 ); }
	/// Return the handle as a TiXmlUnknown. This may return null;
	TiXmlUnknown* Unknown() const			{ return ( ( node && node->ToUnknown() ) ? node->ToUnknown() : 0 ); }

private:
	TiXmlNode* node;
};


#endif