tinyxml.h

otl简单包装实现类,对数据库进行操作的,简单易用.

/*
www.sourceforge.net/projects/tinyxml
Original code (2.0 and earlier )copyright (c) 2000-2002 Lee Thomason (www.grinninglizard.com)

This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any
damages arising from the use of this software.

Permission is granted to anyone to use this software for any
purpose, including commercial applications, and to alter it and
redistribute it freely, subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must
not claim that you wrote the original software. If you use this
software in a product, an acknowledgment in the product documentation
would be appreciated but is not required.

2. Altered source versions must be plainly marked as such, and
must not be misrepresented as being the original software.

3. This notice may not be removed or altered from any source
distribution.
*/


#ifndef TINYXML_INCLUDED
#define TINYXML_INCLUDED

#define TIXML_USE_STL

#ifdef _MSC_VER
#pragma warning( disable : 4530 )
#pragma warning( disable : 4786 )
#endif

#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>

// Help out windows:
#if defined( _DEBUG ) && !defined( DEBUG )
#define DEBUG
#endif

#if defined( DEBUG ) && defined( _MSC_VER )
#include <windows.h>
#define TIXML_LOG OutputDebugString
#else
#define TIXML_LOG printf
#endif

#ifdef TIXML_USE_STL
	#include <string>
 	#include <iostream>
	#define TIXML_STRING	std::string
	#define TIXML_ISTREAM	std::istream
	#define TIXML_OSTREAM	std::ostream
#else
	#include "tinystr.h"
	#define TIXML_STRING	TiXmlString
	#define TIXML_OSTREAM	TiXmlOutStream
#endif

class TiXmlDocument;
class TiXmlElement;
class TiXmlComment;
class TiXmlUnknown;
class TiXmlAttribute;
class TiXmlText;
class TiXmlDeclaration;
class TiXmlParsingData;

const int TIXML_MAJOR_VERSION = 2;
const int TIXML_MINOR_VERSION = 3;
const int TIXML_PATCH_VERSION = 2;

/*	Internal structure for tracking location of items 
	in the XML file.
*/
struct TiXmlCursor
{
	TiXmlCursor()		{ Clear(); }
	void Clear()		{ row = col = -1; }

	int row;	// 0 based.
	int col;	// 0 based.
};


// Only used by Attribute::Query functions
enum 
{ 
	TIXML_SUCCESS,
	TIXML_NO_ATTRIBUTE,
	TIXML_WRONG_TYPE
};


// Used by the parsing routines.
enum TiXmlEncoding
{
	TIXML_ENCODING_UNKNOWN,
	TIXML_ENCODING_UTF8,
	TIXML_ENCODING_LEGACY
};

const TiXmlEncoding TIXML_DEFAULT_ENCODING = TIXML_ENCODING_UNKNOWN;

/** TiXmlBase is a base class for every class in TinyXml.
	It does little except to establish that TinyXml classes
	can be printed and provide some utility functions.

	In XML, the document and elements can contain
	other elements and other types of nodes.

	@verbatim
	A Document can contain:	Element	(container or leaf)
							Comment (leaf)
							Unknown (leaf)
							Declaration( leaf )

	An Element can contain:	Element (container or leaf)
							Text	(leaf)
							Attributes (not on tree)
							Comment (leaf)
							Unknown (leaf)

	A Decleration contains: Attributes (not on tree)
	@endverbatim
*/
class TiXmlBase
{
	friend class TiXmlNode;
	friend class TiXmlElement;
	friend class TiXmlDocument;

public:
	TiXmlBase()	:	userData(0) {}
	virtual ~TiXmlBase()					{}

	/**	All TinyXml classes can print themselves to a filestream.
		This is a formatted print, and will insert tabs and newlines.
		
		(For an unformatted stream, use the << operator.)
	*/
	virtual void Print( FILE* cfile, int depth ) const = 0;

	/**	The world does not agree on whether white space should be kept or
		not. In order to make everyone happy, these global, static functions
		are provided to set whether or not TinyXml will condense all white space
		into a single space or not. The default is to condense. Note changing this
		values is not thread safe.
	*/
	static void SetCondenseWhiteSpace( bool condense )		{ condenseWhiteSpace = condense; }

	/// Return the current white space setting.
	static bool IsWhiteSpaceCondensed()						{ return condenseWhiteSpace; }

	/** Return the position, in the original source file, of this node or attribute.
		The row and column are 1-based. (That is the first row and first column is
		1,1). If the returns values are 0 or less, then the parser does not have
		a row and column value.

		Generally, the row and column value will be set when the TiXmlDocument::Load(),
		TiXmlDocument::LoadFile(), or any TiXmlNode::Parse() is called. It will NOT be set
		when the DOM was created from operator>>.

		The values reflect the initial load. Once the DOM is modified programmatically
		(by adding or changing nodes and attributes) the new values will NOT update to
		reflect changes in the document.

		There is a minor performance cost to computing the row and column. Computation
		can be disabled if TiXmlDocument::SetTabSize() is called with 0 as the value.

		@sa TiXmlDocument::SetTabSize()
	*/
	int Row() const			{ return location.row + 1; }
	int Column() const		{ return location.col + 1; }	///< See Row()

	void  SetUserData( void* user )			{ userData = user; }
	void* GetUserData()						{ return userData; }

	// Table that returs, for a given lead byte, the total number of bytes
	// in the UTF-8 sequence.
	static const int utf8ByteTable[256];

	virtual const char* Parse(	const char* p, 
								TiXmlParsingData* data, 
								TiXmlEncoding encoding /*= TIXML_ENCODING_UNKNOWN */ ) = 0;

protected:

	// See STL_STRING_BUG
	// Utility class to overcome a bug.
	class StringToBuffer
	{
	  public:
		StringToBuffer( const TIXML_STRING& str );
		~StringToBuffer();
		char* buffer;
	};

	static const char*	SkipWhiteSpace( const char*, TiXmlEncoding encoding );
	inline static bool	IsWhiteSpace( char c )		
	{ 
		return ( isspace( (unsigned char) c ) || c == '\n' || c == '\r' ); 
	}

	virtual void StreamOut (TIXML_OSTREAM *) const = 0;

	#ifdef TIXML_USE_STL
	    static bool	StreamWhiteSpace( TIXML_ISTREAM * in, TIXML_STRING * tag );
	    static bool StreamTo( TIXML_ISTREAM * in, int character, TIXML_STRING * tag );
	#endif

	/*	Reads an XML name into the string provided. Returns
		a pointer just past the last character of the name,
		or 0 if the function has an error.
	*/
	static const char* ReadName( const char* p, TIXML_STRING* name, TiXmlEncoding encoding );

	/*	Reads text. Returns a pointer past the given end tag.
		Wickedly complex options, but it keeps the (sensitive) code in one place.
	*/
	static const char* ReadText(	const char* in,				// where to start
									TIXML_STRING* text,			// the string read
									bool ignoreWhiteSpace,		// whether to keep the white space
									const char* endTag,			// what ends this text
									bool ignoreCase,			// whether to ignore case in the end tag
									TiXmlEncoding encoding );	// the current encoding

	// If an entity has been found, transform it into a character.
	static const char* GetEntity( const char* in, char* value, int* length, TiXmlEncoding encoding );

	// Get a character, while interpreting entities.
	// The length can be from 0 to 4 bytes.
	inline static const char* GetChar( const char* p, char* _value, int* length, TiXmlEncoding encoding )
	{
		assert( p );
		if ( encoding == TIXML_ENCODING_UTF8 )
		{
			*length = utf8ByteTable[ *((unsigned char*)p) ];
			assert( *length >= 0 && *length < 5 );
		}
		else
		{
			*length = 1;
		}

		if ( *length == 1 )
		{
			if ( *p == '&' )
				return GetEntity( p, _value, length, encoding );
			*_value = *p;
			return p+1;
		}
		else if ( *length )
		{
			strncpy( _value, p, *length );
			return p + (*length);
		}
		else
		{
			// Not valid text.
			return 0;
		}
	}

	// Puts a string to a stream, expanding entities as it goes.
	// Note this should not contian the '<', '>', etc, or they will be transformed into entities!
	static void PutString( const TIXML_STRING& str, TIXML_OSTREAM* out );

	static void PutString( const TIXML_STRING& str, TIXML_STRING* out );

	// Return true if the next characters in the stream are any of the endTag sequences.
	// Ignore case only works for english, and should only be relied on when comparing
	// to Engilish words: StringEqual( p, "version", true ) is fine.
	static bool StringEqual(	const char* p,
								const char* endTag,
								bool ignoreCase,
								TiXmlEncoding encoding );


	enum
	{
		TIXML_NO_ERROR = 0,
		TIXML_ERROR,
		TIXML_ERROR_OPENING_FILE,
		TIXML_ERROR_OUT_OF_MEMORY,
		TIXML_ERROR_PARSING_ELEMENT,
		TIXML_ERROR_FAILED_TO_READ_ELEMENT_NAME,
		TIXML_ERROR_READING_ELEMENT_VALUE,
		TIXML_ERROR_READING_ATTRIBUTES,
		TIXML_ERROR_PARSING_EMPTY,
		TIXML_ERROR_READING_END_TAG,
		TIXML_ERROR_PARSING_UNKNOWN,
		TIXML_ERROR_PARSING_COMMENT,
		TIXML_ERROR_PARSING_DECLARATION,
		TIXML_ERROR_DOCUMENT_EMPTY,
		TIXML_ERROR_EMBEDDED_NULL,

		TIXML_ERROR_STRING_COUNT
	};
	static const char* errorString[ TIXML_ERROR_STRING_COUNT ];

	TiXmlCursor location;

    /// Field containing a generic user pointer
	void*			userData;
	
	// None of these methods are reliable for any language except English.
	// Good for approximation, not great for accuracy.
	static int IsAlpha( unsigned char anyByte, TiXmlEncoding encoding );
	static int IsAlphaNum( unsigned char anyByte, TiXmlEncoding encoding );
	inline static int ToLower( int v, TiXmlEncoding encoding )
	{
		if ( encoding == TIXML_ENCODING_UTF8 )
		{
			if ( v < 128 ) return tolower( v );
			return v;
		}
		else
		{
			return tolower( v );
		}
	}
	static void ConvertUTF32ToUTF8( unsigned long input, char* output, int* length );

private:
	TiXmlBase( const TiXmlBase& );				// not implemented.
	void operator=( const TiXmlBase& base );	// not allowed.

	struct Entity
	{
		const char*     str;
		unsigned int	strLength;
		char		    chr;
	};
	enum
	{
		NUM_ENTITY = 5,
		MAX_ENTITY_LENGTH = 6

	};
	static Entity entity[ NUM_ENTITY ];
	static bool condenseWhiteSpace;
};


/** The parent class for everything in the Document Object Model.
	(Except for attributes).
	Nodes have siblings, a parent, and children. A node can be
	in a document, or stand on its own. The type of a TiXmlNode
	can be queried, and it can be cast to its more defined type.
*/
class TiXmlNode : public TiXmlBase
{
	friend class TiXmlDocument;
	friend class TiXmlElement;

public:
	#ifdef TIXML_USE_STL	

	    /** An input stream operator, for every class. Tolerant of newlines and
		    formatting, but doesn't expect them.
	    */
	    friend std::istream& operator >> (std::istream& in, TiXmlNode& base);

	    /** An output stream operator, for every class. Note that this outputs
		    without any newlines or formatting, as opposed to Print(), which
		    includes tabs and new lines.

		    The operator<< and operator>> are not completely symmetric. Writing
		    a node to a stream is very well defined. You'll get a nice stream
		    of output, without any extra whitespace or newlines.
		    
		    But reading is not as well defined. (As it always is.) If you create
		    a TiXmlElement (for example) and read that from an input stream,
		    the text needs to define an element or junk will result. This is
		    true of all input streams, but it's worth keeping in mind.

		    A TiXmlDocument will read nodes until it reads a root element, and
			all the children of that root element.
	    */	
	    friend std::ostream& operator<< (std::ostream& out, const TiXmlNode& base);

		/// Appends the XML node or attribute to a std::string.
		friend std::string& operator<< (std::string& out, const TiXmlNode& base );

	#else
	    // Used internally, not part of the public API.
	    friend TIXML_OSTREAM& operator<< (TIXML_OSTREAM& out, const TiXmlNode& base);
	#endif

	/** The types of XML nodes supported by TinyXml. (All the
			unsupported types are picked up by UNKNOWN.)
	*/
	enum NodeType
	{
		DOCUMENT,
		ELEMENT,
		COMMENT,
		UNKNOWN,
		TEXT,
		DECLARATION,
		TYPECOUNT
	};

	virtual ~TiXmlNode();

	/** The meaning of 'value' changes for the specific type of
		TiXmlNode.
		@verbatim
		Document:	filename of the xml file
		Element:	name of the element
		Comment:	the comment text
		Unknown:	the tag contents
		Text:		the text string
		@endverbatim

		The subclasses will wrap this function.
	*/
	const char * Value() const { return value.c_str (); }

	/** Changes the value of the node. Defined as:
		@verbatim
		Document:	filename of the xml file
		Element:	name of the element
		Comment:	the comment text
		Unknown:	the tag contents
		Text:		the text string
		@endverbatim
	*/
	void SetValue(const char * _value) { value = _value;}

    #ifdef TIXML_USE_STL
	/// STL std::string form.
	void SetValue( const std::string& _value )    
	{	  
		StringToBuffer buf( _value );
		SetValue( buf.buffer ? buf.buffer : "" );    	
	}	
	#endif

	/// Delete all the children of this node. Does not affect 'this'.
	void Clear();

	/// One step up the DOM.
	TiXmlNode* Parent() const					{ return parent; }

	TiXmlNode* FirstChild()	const	{ return firstChild; }		///< The first child of this node. Will be null if there are no children.
	TiXmlNode* FirstChild( const char * value ) const;			///< The first child of this node with the matching 'value'. Will be null if none found.

	TiXmlNode* LastChild() const	{ return lastChild; }		/// The last child of this node. Will be null if there are no children.
	TiXmlNode* LastChild( const char * value ) const;			/// The last child of this node matching 'value'. Will be null if there are no children.