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/home/tetron/hack/vos/libs/vos/vutil/tinyxml.hh

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/*
 TinyXML, modified for inclusion in VOS source tree

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.
*/

// modified for VOS, added this line to use the STL by default
#define TIXML_USE_STL 1

#ifndef TINYXML_INCLUDED
#define TINYXML_INCLUDED

#include <vos/vutil/vutildefs.hh>

#ifdef _MSC_VER
#pragma warning( push )
#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
        #define TIXML_STRING    TiXmlString
        #define TIXML_OSTREAM   TiXmlOutStream
#endif

// Deprecated library function hell. Compilers want to use the
// new safe versions. This probably doesn't fully address the problem,
// but it gets closer. There are too many compilers for me to fully
// test. If you get compilation troubles, undefine TIXML_SAFE

#define TIXML_SAFE              // TinyXml isn't fully buffer overrun protected, safe code. This is work in progress.
#ifdef TIXML_SAFE
        #if defined(_MSC_VER) && (_MSC_VER >= 1200 )
                // Microsoft visual studio, version 6 and higher.
                //#pragma message( "Using _sn* functions." )
                #define TIXML_SNPRINTF _snprintf
                #define TIXML_SNSCANF  _snscanf
        #elif defined(__GNUC__) && (__GNUC__ >= 3 )
                // GCC version 3 and higher.s
                //#warning( "Using sn* functions." )
                #define TIXML_SNPRINTF snprintf
                #define TIXML_SNSCANF  snscanf
        #endif
#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 = 4;
const int TIXML_PATCH_VERSION = 2;

/*      Internal structure for tracking location of items
        in the XML file.
*/
struct VUTIL_API 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 VUTIL_API 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;

        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_PARSING_CDATA,

                TIXML_ERROR_STRING_COUNT
        };

protected:

        // See STL_STRING_BUG
        // Utility class to overcome a bug.
        class VUTIL_API 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 *, int depth) 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 );        // lots of compilers don't like this function (unsafe),
                                                                                                // and the null terminator isn't needed
                        for( int i=0; p[i] && i<*length; ++i ) {
                                _value[i] = p[i];
                        }
                        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 English words: StringEqual( p, "version", true ) is fine.
        static bool StringEqual(        const char* p,
                                                                const char* endTag,
                                                                bool ignoreCase,
                                                                TiXmlEncoding encoding );

        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 VUTIL_API 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 VUTIL_API 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.
            */
            VUTIL_API friend std::ostream& operator<< (std::ostream& out, const TiXmlNode& base);

                /// Appends the XML node or attribute to a std::string.
                VUTIL_API 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 (); }

    #ifdef TIXML_USE_STL
        /** Return Value() as a std::string. If you only use STL,
            this is more efficient than calling Value().
                Only available in STL mode.
        */
        const std::string& ValueStr() const { return value; }
        #endif

        /** 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()                                                     { return parent; }
        const TiXmlNode* Parent() const                         { return parent; }

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

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

    #ifdef TIXML_USE_STL
        const TiXmlNode* FirstChild( const std::string& _value ) const  {       return FirstChild (_value.c_str ());    }       ///< STL std::string form.
        TiXmlNode* FirstChild( const std::string& _value )                              {       return FirstChild (_value.c_str ());    }       ///< STL std::string form.
        const TiXmlNode* LastChild( const std::string& _value ) const   {       return LastChild (_value.c_str ());     }       ///< STL std::string form.
        TiXmlNode* LastChild( const std::string& _value )                               {       return LastChild (_value.c_str ());     }       ///< STL std::string form.
        #endif

        /** An alternate way to walk the children of a node.
                One way to iterate over nodes is:
                @verbatim
                        for( child = parent->FirstChild(); child; child = child->NextSibling() )
                @endverbatim

                IterateChildren does the same thing with the syntax:
                @verbatim
                        child = 0;
                        while( child = parent->IterateChildren( child ) )
                @endverbatim

                IterateChildren takes the previous child as input and finds
                the next one. If the previous child is null, it returns the
                first. IterateChildren will return null when done.
        */
        const TiXmlNode* IterateChildren( const TiXmlNode* previous ) const;
        TiXmlNode* IterateChildren( TiXmlNode* previous );

        /// This flavor of IterateChildren searches for children with a particular 'value'
        const TiXmlNode* IterateChildren( const char * value, const TiXmlNode* previous ) const;
        TiXmlNode* IterateChildren( const char * value, TiXmlNode* previous );

    #ifdef TIXML_USE_STL
        const TiXmlNode* IterateChildren( const std::string& _value, const TiXmlNode* previous ) const  {       return IterateChildren (_value.c_str (), previous);     }       ///< STL std::string form.
        TiXmlNode* IterateChildren( const std::string& _value, TiXmlNode* previous ) {  return IterateChildren (_value.c_str (), previous);     }       ///< STL std::string form.
        #endif

        /** Add a new node related to this. Adds a child past the LastChild.
                Returns a pointer to the new object or NULL if an error occured.
        */
        TiXmlNode* InsertEndChild( const TiXmlNode& addThis );


        /** Add a new node related to this. Adds a child past the LastChild.

                NOTE: the node to be added is passed by pointer, and will be
                henceforth owned (and deleted) by tinyXml. This method is efficient
                and avoids an extra copy, but should be used with care as it
                uses a different memory model than the other insert functions.

                @sa InsertEndChild
        */
        TiXmlNode* LinkEndChild( TiXmlNode* addThis );

        /** Add a new node related to this. Adds a child before the specified child.
                Returns a pointer to the new object or NULL if an error occured.
        */
        TiXmlNode* InsertBeforeChild( TiXmlNode* beforeThis, const TiXmlNode& addThis );

        /** Add a new node related to this. Adds a child after the specified child.
                Returns a pointer to the new object or NULL if an error occured.
        */
        TiXmlNode* InsertAfterChild(  TiXmlNode* afterThis, const TiXmlNode& addThis );

        /** Replace a child of this node.
                Returns a pointer to the new object or NULL if an error occured.
        */
        TiXmlNode* ReplaceChild( TiXmlNode* replaceThis, const TiXmlNode& withThis );

        /// Delete a child of this node.
        bool RemoveChild( TiXmlNode* removeThis );

        /// Navigate to a sibling node.
        const TiXmlNode* PreviousSibling() const                        { return prev; }
        TiXmlNode* PreviousSibling()                                            { return prev; }

        /// Navigate to a sibling node.
        const TiXmlNode* PreviousSibling( const char * ) const;
        TiXmlNode* PreviousSibling( const char * );

    #ifdef TIXML_USE_STL
        const TiXmlNode* PreviousSibling( const std::string& _value ) const     {       return PreviousSibling (_value.c_str ());       }       ///< STL std::string form.
        TiXmlNode* PreviousSibling( const std::string& _value )                         {       return PreviousSibling (_value.c_str ());       }       ///< STL std::string form.
        const TiXmlNode* NextSibling( const std::string& _value) const          {       return NextSibling (_value.c_str ());   }       ///< STL std::string form.
        TiXmlNode* NextSibling( const std::string& _value)                                      {       return NextSibling (_value.c_str ());   }       ///< STL std::string form.
        #endif

        /// Navigate to a sibling node.
        const TiXmlNode* NextSibling() const                            { return next; }
        TiXmlNode* NextSibling()                                                        { return next; }

        /// Navigate to a sibling node with the given 'value'.
        const TiXmlNode* NextSibling( const char * ) const;
        TiXmlNode* NextSibling( const char * );

        /** Convenience function to get through elements.
                Calls NextSibling and ToElement. Will skip all non-Element
                nodes. Returns 0 if there is not another element.
        */
        const TiXmlElement* NextSiblingElement() const;
        TiXmlElement* NextSiblingElement();

        /** Convenience function to get through elements.
                Calls NextSibling and ToElement. Will skip all non-Element
                nodes. Returns 0 if there is not another element.
        */
        const TiXmlElement* NextSiblingElement( const char * ) const;
        TiXmlElement* NextSiblingElement( const char * );

    #ifdef TIXML_USE_STL
        const TiXmlElement* NextSiblingElement( const std::string& _value) const        {       return NextSiblingElement (_value.c_str ());    }       ///< STL std::string form.
        TiXmlElement* NextSiblingElement( const std::string& _value)                            {       return NextSiblingElement (_value.c_str ());    }       ///< STL std::string form.
        #endif

        /// Convenience function to get through elements.
        const TiXmlElement* FirstChildElement() const;
        TiXmlElement* FirstChildElement();

        /// Convenience function to get through elements.
        const TiXmlElement* FirstChildElement( const char * value ) const;
        TiXmlElement* FirstChildElement( const char * value );

    #ifdef TIXML_USE_STL
        const TiXmlElement* FirstChildElement( const std::string& _value ) const        {       return FirstChildElement (_value.c_str ());     }       ///< STL std::string form.
        TiXmlElement* FirstChildElement( const std::string& _value )                            {       return FirstChildElement (_value.c_str ());     }       ///< STL std::string form.
        #endif

        /** Query the type (as an enumerated value, above) of this node.
                The possible types are: DOCUMENT, ELEMENT, COMMENT,
                                                                UNKNOWN, TEXT, and DECLARATION.
        */
        int Type() const        { return type; }

        /** Return a pointer to the Document this node lives in.
                Returns null if not in a document.
        */
        const TiXmlDocument* GetDocument() const;
        TiXmlDocument* GetDocument();

        /// Returns true if this node has no children.
        bool NoChildren() const                                         { return !firstChild; }

        const TiXmlDocument* ToDocument()       const           { return ( this && type == DOCUMENT ) ? (const TiXmlDocument*) this : 0; } ///< Cast to a more defined type. Will return null not of the requested type.
        const TiXmlElement*  ToElement() const                  { return ( this && type == ELEMENT  ) ? (const TiXmlElement*)  this : 0; } ///< Cast to a more defined type. Will return null not of the requested type.
        const TiXmlComment*  ToComment() const                  { return ( this && type == COMMENT  ) ? (const TiXmlComment*)  this : 0; } ///< Cast to a more defined type. Will return null not of the requested type.
        const TiXmlUnknown*  ToUnknown() const                  { return ( this && type == UNKNOWN  ) ? (const TiXmlUnknown*)  this : 0; } ///< Cast to a more defined type. Will return null not of the requested type.
        const TiXmlText*           ToText()    const            { return ( this && type == TEXT     ) ? (const TiXmlText*)     this : 0; } ///< Cast to a more defined type. Will return null not of the requested type.
        const TiXmlDeclaration* ToDeclaration() const   { return ( this && type == DECLARATION ) ? (const TiXmlDeclaration*) this : 0; } ///< Cast to a more defined type. Will return null not of the requested type.

        TiXmlDocument* ToDocument()                     { return ( this && type == DOCUMENT ) ? (TiXmlDocument*) this : 0; } ///< Cast to a more defined type. Will return null not of the requested type.
        TiXmlElement*  ToElement()                      { return ( this && type == ELEMENT  ) ? (TiXmlElement*)  this : 0; } ///< Cast to a more defined type. Will return null not of the requested type.
        TiXmlComment*  ToComment()                      { return ( this && type == COMMENT  ) ? (TiXmlComment*)  this : 0; } ///< Cast to a more defined type. Will return null not of the requested type.
        TiXmlUnknown*  ToUnknown()                      { return ( this && type == UNKNOWN  ) ? (TiXmlUnknown*)  this : 0; } ///< Cast to a more defined type. Will return null not of the requested type.
        TiXmlText*         ToText()                     { return ( this && type == TEXT     ) ? (TiXmlText*)     this : 0; } ///< Cast to a more defined type. Will return null not of the requested type.
        TiXmlDeclaration* ToDeclaration()       { return ( this && type == DECLARATION ) ? (TiXmlDeclaration*) this : 0; } ///< Cast to a more defined type. Will return null not of the requested type.

        /** Create an exact duplicate of this node and return it. The memory must be deleted
                by the caller.
        */
        virtual TiXmlNode* Clone() const = 0;

protected:
        TiXmlNode( NodeType _type );

        // Copy to the allocated object. Shared functionality between Clone, Copy constructor,
        // and the assignment operator.
        void CopyTo( TiXmlNode* target ) const;

        #ifdef TIXML_USE_STL
            // The real work of the input operator.
            virtual void StreamIn( TIXML_ISTREAM* in, TIXML_STRING* tag ) = 0;
        #endif

        // Figure out what is at *p, and parse it. Returns null if it is not an xml node.
        TiXmlNode* Identify( const char* start, TiXmlEncoding encoding );

        TiXmlNode*              parent;
        NodeType                type;

        TiXmlNode*              firstChild;
        TiXmlNode*              lastChild;

        TIXML_STRING    value;

        TiXmlNode*              prev;
        TiXmlNode*              next;

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


/** An attribute is a name-value pair. Elements have an arbitrary
        number of attributes, each with a unique name.

        @note The attributes are not TiXmlNodes, since they are not
                  part of the tinyXML document object model. There are other
                  suggested ways to look at this problem.
*/
class VUTIL_API TiXmlAttribute : public TiXmlBase
{
        friend class TiXmlAttributeSet;

public:
        /// Construct an empty attribute.
        TiXmlAttribute() : TiXmlBase()
        {
                document = 0;
                prev = next = 0;
        }

        #ifdef TIXML_USE_STL
        /// std::string constructor.
        TiXmlAttribute( const std::string& _name, const std::string& _value )
        {
                name = _name;
                value = _value;
                document = 0;
                prev = next = 0;
        }
        #endif

        /// Construct an attribute with a name and value.
        TiXmlAttribute( const char * _name, const char * _value )
        {
                name = _name;
                value = _value;
                document = 0;
                prev = next = 0;
        }

        const char*             Name()  const           { return name.c_str (); }               ///< Return the name of this attribute.
        const char*             Value() const           { return value.c_str (); }              ///< Return the value of this attribute.
        int                             IntValue() const;                                                                       ///< Return the value of this attribute, converted to an integer.
        double                  DoubleValue() const;                                                            ///< Return the value of this attribute, converted to a double.

        /** QueryIntValue examines the value string. It is an alternative to the
                IntValue() method with richer error checking.
                If the value is an integer, it is stored in 'value' and
                the call returns TIXML_SUCCESS. If it is not
                an integer, it returns TIXML_WRONG_TYPE.

                A specialized but useful call. Note that for success it returns 0,
                which is the opposite of almost all other TinyXml calls.
        */
        int QueryIntValue( int* _value ) const;
        /// QueryDoubleValue examines the value string. See QueryIntValue().
        int QueryDoubleValue( double* _value ) const;

        void SetName( const char* _name )       { name = _name; }                               ///< Set the name of this attribute.
        void SetValue( const char* _value )     { value = _value; }                             ///< Set the value.

        void SetIntValue( int _value );                                                                         ///< Set the value from an integer.
        void SetDoubleValue( double _value );                                                           ///< Set the value from a double.

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

        /// Get the next sibling attribute in the DOM. Returns null at end.
        const TiXmlAttribute* Next() const;
        TiXmlAttribute* Next();
        /// Get the previous sibling attribute in the DOM. Returns null at beginning.
        const TiXmlAttribute* Previous() const;
        TiXmlAttribute* Previous();

        bool operator==( const TiXmlAttribute& rhs ) const { return rhs.name == name; }
        bool operator<( const TiXmlAttribute& rhs )      const { return name < rhs.name; }
        bool operator>( const TiXmlAttribute& rhs )  const { return name > rhs.name; }

        /*      Attribute parsing starts: first letter of the name
                                                 returns: the next char after the value end quote
        */
        virtual const char* Parse( const char* p, TiXmlParsingData* data, TiXmlEncoding encoding );

        // Prints this Attribute to a FILE stream.
        virtual void Print( FILE* cfile, int depth ) const;

        virtual