tinyxml2.h

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/*
Original code by 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 TINYXML2_INCLUDED
#define TINYXML2_INCLUDED

#if defined(ANDROID_NDK) || defined(__BORLANDC__)
#   include <ctype.h>
#   include <limits.h>
#   include <stdio.h>
#   include <stdlib.h>
#   include <string.h>
#   include <stdarg.h>
#else
#   include <cctype>
#   include <climits>
#   include <cstdio>
#   include <cstdlib>
#   include <cstring>
#   include <cstdarg>
#endif

/*
   TODO: intern strings instead of allocation.
*/
/*
        gcc:
        g++ -Wall -DDEBUG tinyxml2.cpp xmltest.cpp -o gccxmltest.exe

    Formatting, Artistic Style:
        AStyle.exe --style=1tbs --indent-switches --break-closing-brackets --indent-preprocessor tinyxml2.cpp tinyxml2.h
*/

#if defined( _DEBUG ) || defined( DEBUG ) || defined (__DEBUG__)
#   ifndef DEBUG
#       define DEBUG
#   endif
#endif


#if defined(DEBUG)
#   if defined(_MSC_VER)
#       define TIXMLASSERT( x )           if ( !(x)) { __debugbreak(); } //if ( !(x)) WinDebugBreak()
#   elif defined (ANDROID_NDK)
#       include <android/log.h>
#       define TIXMLASSERT( x )           if ( !(x)) { __android_log_assert( "assert", "grinliz", "ASSERT in '%s' at %d.", __FILE__, __LINE__ ); }
#   else
#       include <assert.h>
#       define TIXMLASSERT                assert
#   endif
#   else
#       define TIXMLASSERT( x )           {}
#endif


#if defined(_MSC_VER) && (_MSC_VER >= 1400 )
// Microsoft visual studio, version 2005 and higher.
/*int _snprintf_s(
   char *buffer,
   size_t sizeOfBuffer,
   size_t count,
   const char *format [,
          argument] ...
);*/
inline int TIXML_SNPRINTF( char* buffer, size_t size, const char* format, ... )
{
    va_list va;
    va_start( va, format );
    int result = vsnprintf_s( buffer, size, _TRUNCATE, format, va );
    va_end( va );
    return result;
}
#define TIXML_SSCANF   sscanf_s
#else
// GCC version 3 and higher
//#warning( "Using sn* functions." )
#define TIXML_SNPRINTF snprintf
#define TIXML_SSCANF   sscanf
#endif

static const int TIXML2_MAJOR_VERSION = 1;
static const int TIXML2_MINOR_VERSION = 0;
static const int TIXML2_PATCH_VERSION = 9;

namespace tinyxml2
{
class XMLDocument;
class XMLElement;
class XMLAttribute;
class XMLComment;
class XMLNode;
class XMLText;
class XMLDeclaration;
class XMLUnknown;

class XMLPrinter;

/*
        A class that wraps strings. Normally stores the start and end
        pointers into the XML file itself, and will apply normalization
        and entity translation if actually read. Can also store (and memory
        manage) a traditional char[]
*/
class StrPair
{
public:
    enum {
        NEEDS_ENTITY_PROCESSING                 = 0x01,
        NEEDS_NEWLINE_NORMALIZATION             = 0x02,
        COLLAPSE_WHITESPACE                             = 0x04,

        TEXT_ELEMENT                        = NEEDS_ENTITY_PROCESSING | NEEDS_NEWLINE_NORMALIZATION,
        TEXT_ELEMENT_LEAVE_ENTITIES             = NEEDS_NEWLINE_NORMALIZATION,
        ATTRIBUTE_NAME                      = 0,
        ATTRIBUTE_VALUE                     = NEEDS_ENTITY_PROCESSING | NEEDS_NEWLINE_NORMALIZATION,
        ATTRIBUTE_VALUE_LEAVE_ENTITIES  = NEEDS_NEWLINE_NORMALIZATION,
        COMMENT                                     = NEEDS_NEWLINE_NORMALIZATION
    };

    StrPair() : _flags( 0 ), _start( 0 ), _end( 0 ) {}
    ~StrPair();

    void Set( char* start, char* end, int flags ) {
        Reset();
        _start  = start;
        _end    = end;
        _flags  = flags | NEEDS_FLUSH;
    }

    const char* GetStr();

    bool Empty() const {
        return _start == _end;
    }

    void SetInternedStr( const char* str ) {
        Reset();
        _start = const_cast<char*>(str);
    }

    void SetStr( const char* str, int flags=0 );

    char* ParseText( char* in, const char* endTag, int strFlags );
    char* ParseName( char* in );

private:
    void Reset();
    void CollapseWhitespace();

    enum {
        NEEDS_FLUSH = 0x100,
        NEEDS_DELETE = 0x200
    };

    // After parsing, if *end != 0, it can be set to zero.
    int     _flags;
    char*   _start;
    char*   _end;
};


/*
        A dynamic array of Plain Old Data. Doesn't support constructors, etc.
        Has a small initial memory pool, so that low or no usage will not
        cause a call to new/delete
*/
template <class T, int INIT>
class DynArray
{
public:
    DynArray< T, INIT >() {
        _mem = _pool;
        _allocated = INIT;
        _size = 0;
    }

    ~DynArray() {
        if ( _mem != _pool ) {
            delete [] _mem;
        }
    }

    void Push( T t ) {
        EnsureCapacity( _size+1 );
        _mem[_size++] = t;
    }

    T* PushArr( int count ) {
        EnsureCapacity( _size+count );
        T* ret = &_mem[_size];
        _size += count;
        return ret;
    }

    T Pop() {
        return _mem[--_size];
    }

    void PopArr( int count ) {
        TIXMLASSERT( _size >= count );
        _size -= count;
    }

    bool Empty() const                                  {
        return _size == 0;
    }

    T& operator[](int i)                                {
        TIXMLASSERT( i>= 0 && i < _size );
        return _mem[i];
    }

    const T& operator[](int i) const    {
        TIXMLASSERT( i>= 0 && i < _size );
        return _mem[i];
    }

    int Size() const                                    {
        return _size;
    }

    int Capacity() const                                {
        return _allocated;
    }

    const T* Mem() const                                {
        return _mem;
    }

    T* Mem()                                                    {
        return _mem;
    }

private:
    void EnsureCapacity( int cap ) {
        if ( cap > _allocated ) {
            int newAllocated = cap * 2;
            T* newMem = new T[newAllocated];
            memcpy( newMem, _mem, sizeof(T)*_size );    // warning: not using constructors, only works for PODs
            if ( _mem != _pool ) {
                delete [] _mem;
            }
            _mem = newMem;
            _allocated = newAllocated;
        }
    }

    T*  _mem;
    T   _pool[INIT];
    int _allocated;             // objects allocated
    int _size;                  // number objects in use
};


/*
        Parent virtual class of a pool for fast allocation
        and deallocation of objects.
*/
class MemPool
{
public:
    MemPool() {}
    virtual ~MemPool() {}

    virtual int ItemSize() const = 0;
    virtual void* Alloc() = 0;
    virtual void Free( void* ) = 0;
    virtual void SetTracked() = 0;
};


/*
        Template child class to create pools of the correct type.
*/
template< int SIZE >
class MemPoolT : public MemPool
{
public:
    MemPoolT() : _root(0), _currentAllocs(0), _nAllocs(0), _maxAllocs(0), _nUntracked(0)        {}
    ~MemPoolT() {
        // Delete the blocks.
        for( int i=0; i<_blockPtrs.Size(); ++i ) {
            delete _blockPtrs[i];
        }
    }

    virtual int ItemSize() const        {
        return SIZE;
    }
    int CurrentAllocs() const           {
        return _currentAllocs;
    }

    virtual void* Alloc() {
        if ( !_root ) {
            // Need a new block.
            Block* block = new Block();
            _blockPtrs.Push( block );

            for( int i=0; i<COUNT-1; ++i ) {
                block->chunk[i].next = &block->chunk[i+1];
            }
            block->chunk[COUNT-1].next = 0;
            _root = block->chunk;
        }
        void* result = _root;
        _root = _root->next;

        ++_currentAllocs;
        if ( _currentAllocs > _maxAllocs ) {
            _maxAllocs = _currentAllocs;
        }
        _nAllocs++;
        _nUntracked++;
        return result;
    }
    virtual void Free( void* mem ) {
        if ( !mem ) {
            return;
        }
        --_currentAllocs;
        Chunk* chunk = (Chunk*)mem;
#ifdef DEBUG
        memset( chunk, 0xfe, sizeof(Chunk) );
#endif
        chunk->next = _root;
        _root = chunk;
    }
    void Trace( const char* name ) {
        printf( "Mempool %s watermark=%d [%dk] current=%d size=%d nAlloc=%d blocks=%d\n",
                name, _maxAllocs, _maxAllocs*SIZE/1024, _currentAllocs, SIZE, _nAllocs, _blockPtrs.Size() );
    }

    void SetTracked() {
        _nUntracked--;
    }

    int Untracked() const {
        return _nUntracked;
    }

    enum { COUNT = 1024/SIZE }; // Some compilers do not accept to use COUNT in private part if COUNT is private

private:
    union Chunk {
        Chunk*  next;
        char    mem[SIZE];
    };
    struct Block {
        Chunk chunk[COUNT];
    };
    DynArray< Block*, 10 > _blockPtrs;
    Chunk* _root;

    int _currentAllocs;
    int _nAllocs;
    int _maxAllocs;
    int _nUntracked;
};



class XMLVisitor
{
public:
    virtual ~XMLVisitor() {}

    virtual bool VisitEnter( const XMLDocument& /*doc*/ )                       {
        return true;
    }
    virtual bool VisitExit( const XMLDocument& /*doc*/ )                        {
        return true;
    }

    virtual bool VisitEnter( const XMLElement& /*element*/, const XMLAttribute* /*firstAttribute*/ )    {
        return true;
    }
    virtual bool VisitExit( const XMLElement& /*element*/ )                     {
        return true;
    }

    virtual bool Visit( const XMLDeclaration& /*declaration*/ )         {
        return true;
    }
    virtual bool Visit( const XMLText& /*text*/ )                                       {
        return true;
    }
    virtual bool Visit( const XMLComment& /*comment*/ )                         {
        return true;
    }
    virtual bool Visit( const XMLUnknown& /*unknown*/ )                         {
        return true;
    }
};


/*
        Utility functionality.
*/
class XMLUtil
{
public:
    // Anything in the high order range of UTF-8 is assumed to not be whitespace. This isn't
    // correct, but simple, and usually works.
    static const char* SkipWhiteSpace( const char* p )  {
        while( !IsUTF8Continuation(*p) && isspace( *reinterpret_cast<const unsigned char*>(p) ) ) {
            ++p;
        }
        return p;
    }
    static char* SkipWhiteSpace( char* p )                              {
        while( !IsUTF8Continuation(*p) && isspace( *reinterpret_cast<unsigned char*>(p) ) )             {
            ++p;
        }
        return p;
    }
    static bool IsWhiteSpace( char p )                                  {
        return !IsUTF8Continuation(p) && isspace( static_cast<unsigned char>(p) );
    }

    inline static bool StringEqual( const char* p, const char* q, int nChar=INT_MAX )  {
        int n = 0;
        if ( p == q ) {
            return true;
        }
        while( *p && *q && *p == *q && n<nChar ) {
            ++p;
            ++q;
            ++n;
        }
        if ( (n == nChar) || ( *p == 0 && *q == 0 ) ) {
            return true;
        }
        return false;
    }
    inline static int IsUTF8Continuation( const char p ) {
        return p & 0x80;
    }
    inline static int IsAlphaNum( unsigned char anyByte )       {
        return ( anyByte < 128 ) ? isalnum( anyByte ) : 1;
    }
    inline static int IsAlpha( unsigned char anyByte )          {
        return ( anyByte < 128 ) ? isalpha( anyByte ) : 1;
    }

    static const char* ReadBOM( const char* p, bool* hasBOM );
    // p is the starting location,
    // the UTF-8 value of the entity will be placed in value, and length filled in.
    static const char* GetCharacterRef( const char* p, char* value, int* length );
    static void ConvertUTF32ToUTF8( unsigned long input, char* output, int* length );

    // converts primitive types to strings
    static void ToStr( int v, char* buffer, int bufferSize );
    static void ToStr( unsigned v, char* buffer, int bufferSize );
    static void ToStr( bool v, char* buffer, int bufferSize );
    static void ToStr( float v, char* buffer, int bufferSize );
    static void ToStr( double v, char* buffer, int bufferSize );

    // converts strings to primitive types
    static bool ToInt( const char* str, int* value );
    static bool ToUnsigned( const char* str, unsigned* value );
    static bool ToBool( const char* str, bool* value );
    static bool ToFloat( const char* str, float* value );
    static bool ToDouble( const char* str, double* value );
};


class XMLNode
{
    friend class XMLDocument;
    friend class XMLElement;
public:

    const XMLDocument* GetDocument() const      {
        return _document;
    }
    XMLDocument* GetDocument()                          {
        return _document;
    }

    virtual XMLElement*         ToElement()             {
        return 0;
    }
    virtual XMLText*            ToText()                {
        return 0;
    }
    virtual XMLComment*         ToComment()             {
        return 0;
    }
    virtual XMLDocument*        ToDocument()    {
        return 0;
    }
    virtual XMLDeclaration*     ToDeclaration() {
        return 0;
    }
    virtual XMLUnknown*         ToUnknown()             {
        return 0;
    }

    virtual const XMLElement*           ToElement() const               {
        return 0;
    }
    virtual const XMLText*                      ToText() const                  {
        return 0;
    }
    virtual const XMLComment*           ToComment() const               {
        return 0;
    }
    virtual const XMLDocument*          ToDocument() const              {
        return 0;
    }
    virtual const XMLDeclaration*       ToDeclaration() const   {
        return 0;
    }
    virtual const XMLUnknown*           ToUnknown() const               {
        return 0;
    }

    const char* Value() const                   {
        return _value.GetStr();
    }

    void SetValue( const char* val, bool staticMem=false );

    const XMLNode*      Parent() const                  {
        return _parent;
    }

    XMLNode* Parent()                                           {
        return _parent;
    }

    bool NoChildren() const                                     {
        return !_firstChild;
    }

    const XMLNode*  FirstChild() const          {
        return _firstChild;
    }

    XMLNode*            FirstChild()                    {
        return _firstChild;
    }

    const XMLElement* FirstChildElement( const char* value=0 ) const;

    XMLElement* FirstChildElement( const char* value=0 )        {
        return const_cast<XMLElement*>(const_cast<const XMLNode*>(this)->FirstChildElement( value ));
    }

    const XMLNode*      LastChild() const                                               {
        return _lastChild;
    }

    XMLNode*            LastChild()                                                             {
        return const_cast<XMLNode*>(const_cast<const XMLNode*>(this)->LastChild() );
    }

    const XMLElement* LastChildElement( const char* value=0 ) const;

    XMLElement* LastChildElement( const char* value=0 ) {
        return const_cast<XMLElement*>(const_cast<const XMLNode*>(this)->LastChildElement(value) );
    }

    const XMLNode*      PreviousSibling() const                                 {
        return _prev;
    }

    XMLNode*    PreviousSibling()                                                       {
        return _prev;
    }

    const XMLElement*   PreviousSiblingElement( const char* value=0 ) const ;

    XMLElement* PreviousSiblingElement( const char* value=0 ) {
        return const_cast<XMLElement*>(const_cast<const XMLNode*>(this)->PreviousSiblingElement( value ) );
    }

    const XMLNode*      NextSibling() const                                             {
        return _next;
    }

    XMLNode*    NextSibling()                                                           {
        return _next;
    }

    const XMLElement*   NextSiblingElement( const char* value=0 ) const;

    XMLElement* NextSiblingElement( const char* value=0 )       {
        return const_cast<XMLElement*>(const_cast<const XMLNode*>(this)->NextSiblingElement( value ) );
    }

    XMLNode* InsertEndChild( XMLNode* addThis );

    XMLNode* LinkEndChild( XMLNode* addThis )   {
        return InsertEndChild( addThis );
    }
    XMLNode* InsertFirstChild( XMLNode* addThis );
    XMLNode* InsertAfterChild( XMLNode* afterThis, XMLNode* addThis );

    void DeleteChildren();

    void DeleteChild( XMLNode* node );

    virtual XMLNode* ShallowClone( XMLDocument* document ) const = 0;

    virtual bool ShallowEqual( const XMLNode* compare ) const = 0;

    virtual bool Accept( XMLVisitor* visitor ) const = 0;

    // internal
    virtual char* ParseDeep( char*, StrPair* );

protected:
    XMLNode( XMLDocument* );
    virtual ~XMLNode();
    XMLNode( const XMLNode& );  // not supported
    XMLNode& operator=( const XMLNode& );       // not supported

    XMLDocument*        _document;
    XMLNode*            _parent;
    mutable StrPair     _value;

    XMLNode*            _firstChild;
    XMLNode*            _lastChild;

    XMLNode*            _prev;
    XMLNode*            _next;

private:
    MemPool*            _memPool;
    void Unlink( XMLNode* child );
};


class XMLText : public XMLNode
{
    friend class XMLBase;
    friend class XMLDocument;
public:
    virtual bool Accept( XMLVisitor* visitor ) const;

    virtual XMLText* ToText()                   {
        return this;
    }
    virtual const XMLText* ToText() const       {
        return this;
    }

    void SetCData( bool isCData )                       {
        _isCData = isCData;
    }
    bool CData() const                                          {
        return _isCData;
    }

    char* ParseDeep( char*, StrPair* endTag );
    virtual XMLNode* ShallowClone( XMLDocument* document ) const;
    virtual bool ShallowEqual( const XMLNode* compare ) const;

protected:
    XMLText( XMLDocument* doc ) : XMLNode( doc ), _isCData( false )     {}
    virtual ~XMLText()                                                                                          {}
    XMLText( const XMLText& );  // not supported
    XMLText& operator=( const XMLText& );       // not supported

private:
    bool _isCData;
};


class XMLComment : public XMLNode
{
    friend class XMLDocument;
public:
    virtual XMLComment* ToComment()                                     {
        return this;
    }
    virtual const XMLComment* ToComment() const         {
        return this;
    }

    virtual bool Accept( XMLVisitor* visitor ) const;

    char* ParseDeep( char*, StrPair* endTag );
    virtual XMLNode* ShallowClone( XMLDocument* document ) const;
    virtual bool ShallowEqual( const XMLNode* compare ) const;

protected:
    XMLComment( XMLDocument* doc );
    virtual ~XMLComment();
    XMLComment( const XMLComment& );    // not supported
    XMLComment& operator=( const XMLComment& ); // not supported

private:
};


class XMLDeclaration : public XMLNode
{
    friend class XMLDocument;
public:
    virtual XMLDeclaration*     ToDeclaration()                                 {
        return this;
    }
    virtual const XMLDeclaration* ToDeclaration() const         {
        return this;
    }

    virtual bool Accept( XMLVisitor* visitor ) const;

    char* ParseDeep( char*, StrPair* endTag );
    virtual XMLNode* ShallowClone( XMLDocument* document ) const;
    virtual bool ShallowEqual( const XMLNode* compare ) const;

protected:
    XMLDeclaration( XMLDocument* doc );
    virtual ~XMLDeclaration();
    XMLDeclaration( const XMLDeclaration& );    // not supported
    XMLDeclaration& operator=( const XMLDeclaration& ); // not supported
};


class XMLUnknown : public XMLNode
{
    friend class XMLDocument;
public:
    virtual XMLUnknown* ToUnknown()                                     {
        return this;
    }
    virtual const XMLUnknown* ToUnknown() const         {
        return this;
    }

    virtual bool Accept( XMLVisitor* visitor ) const;

    char* ParseDeep( char*, StrPair* endTag );
    virtual XMLNode* ShallowClone( XMLDocument* document ) const;
    virtual bool ShallowEqual( const XMLNode* compare ) const;

protected:
    XMLUnknown( XMLDocument* doc );
    virtual ~XMLUnknown();
    XMLUnknown( const XMLUnknown& );    // not supported
    XMLUnknown& operator=( const XMLUnknown& ); // not supported
};


enum XMLError {
    XML_NO_ERROR = 0,
    XML_SUCCESS = 0,

    XML_NO_ATTRIBUTE,
    XML_WRONG_ATTRIBUTE_TYPE,

    XML_ERROR_FILE_NOT_FOUND,
    XML_ERROR_FILE_COULD_NOT_BE_OPENED,
    XML_ERROR_FILE_READ_ERROR,
    XML_ERROR_ELEMENT_MISMATCH,
    XML_ERROR_PARSING_ELEMENT,
    XML_ERROR_PARSING_ATTRIBUTE,
    XML_ERROR_IDENTIFYING_TAG,
    XML_ERROR_PARSING_TEXT,
    XML_ERROR_PARSING_CDATA,
    XML_ERROR_PARSING_COMMENT,
    XML_ERROR_PARSING_DECLARATION,
    XML_ERROR_PARSING_UNKNOWN,
    XML_ERROR_EMPTY_DOCUMENT,
    XML_ERROR_MISMATCHED_ELEMENT,
    XML_ERROR_PARSING,

    XML_CAN_NOT_CONVERT_TEXT,
    XML_NO_TEXT_NODE
};


class XMLAttribute
{
    friend class XMLElement;
public:
    const char* Name() const {
        return _name.GetStr();
    }
    const char* Value() const {
        return _value.GetStr();
    }
    const XMLAttribute* Next() const {
        return _next;
    }

    int          IntValue() const                               {
        int i=0;
        QueryIntValue( &i );
        return i;
    }
    unsigned UnsignedValue() const                      {
        unsigned i=0;
        QueryUnsignedValue( &i );
        return i;
    }
    bool         BoolValue() const                              {
        bool b=false;
        QueryBoolValue( &b );
        return b;
    }
    double       DoubleValue() const                    {
        double d=0;
        QueryDoubleValue( &d );
        return d;
    }
    float        FloatValue() const                             {
        float f=0;
        QueryFloatValue( &f );
        return f;
    }

    XMLError QueryIntValue( int* value ) const;
    XMLError QueryUnsignedValue( unsigned int* value ) const;
    XMLError QueryBoolValue( bool* value ) const;
    XMLError QueryDoubleValue( double* value ) const;
    XMLError QueryFloatValue( float* value ) const;

    void SetAttribute( const char* value );
    void SetAttribute( int value );
    void SetAttribute( unsigned value );
    void SetAttribute( bool value );
    void SetAttribute( double value );
    void SetAttribute( float value );

private:
    enum { BUF_SIZE = 200 };

    XMLAttribute() : _next( 0 ) {}
    virtual ~XMLAttribute()     {}

    XMLAttribute( const XMLAttribute& );        // not supported
    void operator=( const XMLAttribute& );      // not supported
    void SetName( const char* name );

    char* ParseDeep( char* p, bool processEntities );

    mutable StrPair _name;
    mutable StrPair _value;
    XMLAttribute*   _next;
    MemPool*        _memPool;
};


class XMLElement : public XMLNode
{
    friend class XMLBase;
    friend class XMLDocument;
public:
    const char* Name() const            {
        return Value();
    }
    void SetName( const char* str, bool staticMem=false )       {
        SetValue( str, staticMem );
    }

    virtual XMLElement* ToElement()                             {
        return this;
    }
    virtual const XMLElement* ToElement() const {
        return this;
    }
    virtual bool Accept( XMLVisitor* visitor ) const;

    const char* Attribute( const char* name, const char* value=0 ) const;

    int          IntAttribute( const char* name ) const         {
        int i=0;
        QueryIntAttribute( name, &i );
        return i;
    }
    unsigned UnsignedAttribute( const char* name ) const {
        unsigned i=0;
        QueryUnsignedAttribute( name, &i );
        return i;
    }
    bool         BoolAttribute( const char* name ) const        {
        bool b=false;
        QueryBoolAttribute( name, &b );
        return b;
    }
    double       DoubleAttribute( const char* name ) const      {
        double d=0;
        QueryDoubleAttribute( name, &d );
        return d;
    }
    float        FloatAttribute( const char* name ) const       {
        float f=0;
        QueryFloatAttribute( name, &f );
        return f;
    }

    XMLError QueryIntAttribute( const char* name, int* value ) const                            {
        const XMLAttribute* a = FindAttribute( name );
        if ( !a ) {
            return XML_NO_ATTRIBUTE;
        }
        return a->QueryIntValue( value );
    }
    XMLError QueryUnsignedAttribute( const char* name, unsigned int* value ) const      {
        const XMLAttribute* a = FindAttribute( name );
        if ( !a ) {
            return XML_NO_ATTRIBUTE;
        }
        return a->QueryUnsignedValue( value );
    }
    XMLError QueryBoolAttribute( const char* name, bool* value ) const                          {
        const XMLAttribute* a = FindAttribute( name );
        if ( !a ) {
            return XML_NO_ATTRIBUTE;
        }
        return a->QueryBoolValue( value );
    }
    XMLError QueryDoubleAttribute( const char* name, double* value ) const                      {
        const XMLAttribute* a = FindAttribute( name );
        if ( !a ) {
            return XML_NO_ATTRIBUTE;
        }
        return a->QueryDoubleValue( value );
    }
    XMLError QueryFloatAttribute( const char* name, float* value ) const                        {
        const XMLAttribute* a = FindAttribute( name );
        if ( !a ) {
            return XML_NO_ATTRIBUTE;
        }
        return a->QueryFloatValue( value );
    }

    void SetAttribute( const char* name, const char* value )    {
        XMLAttribute* a = FindOrCreateAttribute( name );
        a->SetAttribute( value );
    }
    void SetAttribute( const char* name, int value )                    {
        XMLAttribute* a = FindOrCreateAttribute( name );
        a->SetAttribute( value );
    }
    void SetAttribute( const char* name, unsigned value )               {
        XMLAttribute* a = FindOrCreateAttribute( name );
        a->SetAttribute( value );
    }
    void SetAttribute( const char* name, bool value )                   {
        XMLAttribute* a = FindOrCreateAttribute( name );
        a->SetAttribute( value );
    }
    void SetAttribute( const char* name, double value )         {
        XMLAttribute* a = FindOrCreateAttribute( name );
        a->SetAttribute( value );
    }

    void DeleteAttribute( const char* name );

    const XMLAttribute* FirstAttribute() const {
        return _rootAttribute;
    }
    const XMLAttribute* FindAttribute( const char* name ) const;

    const char* GetText() const;

    XMLError QueryIntText( int* ival ) const;
    XMLError QueryUnsignedText( unsigned* uval ) const;
    XMLError QueryBoolText( bool* bval ) const;
    XMLError QueryDoubleText( double* dval ) const;
    XMLError QueryFloatText( float* fval ) const;

    // internal:
    enum {
        OPEN,           // <foo>
        CLOSED,         // <foo/>
        CLOSING         // </foo>
    };
    int ClosingType() const {
        return _closingType;
    }
    char* ParseDeep( char* p, StrPair* endTag );
    virtual XMLNode* ShallowClone( XMLDocument* document ) const;
    virtual bool ShallowEqual( const XMLNode* compare ) const;

private:
    XMLElement( XMLDocument* doc );
    virtual ~XMLElement();
    XMLElement( const XMLElement& );    // not supported
    void operator=( const XMLElement& );        // not supported

    XMLAttribute* FindAttribute( const char* name );
    XMLAttribute* FindOrCreateAttribute( const char* name );
    //void LinkAttribute( XMLAttribute* attrib );
    char* ParseAttributes( char* p );

    int _closingType;
    // The attribute list is ordered; there is no 'lastAttribute'
    // because the list needs to be scanned for dupes before adding
    // a new attribute.
    XMLAttribute* _rootAttribute;
};


enum Whitespace {
    PRESERVE_WHITESPACE,
    COLLAPSE_WHITESPACE
};


class XMLDocument : public XMLNode
{
    friend class XMLElement;
public:
    XMLDocument( bool processEntities = true, Whitespace = PRESERVE_WHITESPACE );
    ~XMLDocument();

    virtual XMLDocument* ToDocument()                           {
        return this;
    }
    virtual const XMLDocument* ToDocument() const       {
        return this;
    }

    XMLError Parse( const char* xml, size_t nBytes=(size_t)(-1) );

    XMLError LoadFile( const char* filename );

    XMLError LoadFile( FILE* );

    XMLError SaveFile( const char* filename, bool compact = false );

    XMLError SaveFile( FILE* fp, bool compact = false );

    bool ProcessEntities() const                {
        return _processEntities;
    }
    Whitespace WhitespaceMode() const   {
        return _whitespace;
    }

    bool HasBOM() const {
        return _writeBOM;
    }
    void SetBOM( bool useBOM ) {
        _writeBOM = useBOM;
    }

    XMLElement* RootElement()                           {
        return FirstChildElement();
    }
    const XMLElement* RootElement() const       {
        return FirstChildElement();
    }

    void Print( XMLPrinter* streamer=0 );
    virtual bool Accept( XMLVisitor* visitor ) const;

    XMLElement* NewElement( const char* name );
    XMLComment* NewComment( const char* comment );
    XMLText* NewText( const char* text );
    XMLDeclaration* NewDeclaration( const char* text=0 );
    XMLUnknown* NewUnknown( const char* text );

    void DeleteNode( XMLNode* node )    {
        node->_parent->DeleteChild( node );
    }

    void SetError( XMLError error, const char* str1, const char* str2 );

    bool Error() const {
        return _errorID != XML_NO_ERROR;
    }
    XMLError  ErrorID() const {
        return _errorID;
    }
    const char* GetErrorStr1() const {
        return _errorStr1;
    }
    const char* GetErrorStr2() const {
        return _errorStr2;
    }
    void PrintError() const;

    // internal
    char* Identify( char* p, XMLNode** node );

    virtual XMLNode* ShallowClone( XMLDocument* /*document*/ ) const    {
        return 0;
    }
    virtual bool ShallowEqual( const XMLNode* /*compare*/ ) const       {
        return false;
    }

private:
    XMLDocument( const XMLDocument& );  // not supported
    void operator=( const XMLDocument& );       // not supported
    void InitDocument();

    bool        _writeBOM;
    bool        _processEntities;
    XMLError    _errorID;
    Whitespace  _whitespace;
    const char* _errorStr1;
    const char* _errorStr2;
    char*       _charBuffer;

    MemPoolT< sizeof(XMLElement) >       _elementPool;
    MemPoolT< sizeof(XMLAttribute) > _attributePool;
    MemPoolT< sizeof(XMLText) >          _textPool;
    MemPoolT< sizeof(XMLComment) >       _commentPool;
};


class XMLHandle
{
public:
    XMLHandle( XMLNode* node )                                                                                          {
        _node = node;
    }
    XMLHandle( XMLNode& node )                                                                                          {
        _node = &node;
    }
    XMLHandle( const XMLHandle& ref )                                                                           {
        _node = ref._node;
    }
    XMLHandle& operator=( const XMLHandle& ref )                                                        {
        _node = ref._node;
        return *this;
    }

    XMLHandle FirstChild()                                                                                                      {
        return XMLHandle( _node ? _node->FirstChild() : 0 );
    }
    XMLHandle FirstChildElement( const char* value=0 )                                          {
        return XMLHandle( _node ? _node->FirstChildElement( value ) : 0 );
    }
    XMLHandle LastChild()                                                                                                       {
        return XMLHandle( _node ? _node->LastChild() : 0 );
    }
    XMLHandle LastChildElement( const char* _value=0 )                                          {
        return XMLHandle( _node ? _node->LastChildElement( _value ) : 0 );
    }
    XMLHandle PreviousSibling()                                                                                         {
        return XMLHandle( _node ? _node->PreviousSibling() : 0 );
    }
    XMLHandle PreviousSiblingElement( const char* _value=0 )                            {
        return XMLHandle( _node ? _node->PreviousSiblingElement( _value ) : 0 );
    }
    XMLHandle NextSibling()                                                                                                     {
        return XMLHandle( _node ? _node->NextSibling() : 0 );
    }
    XMLHandle NextSiblingElement( const char* _value=0 )                                        {
        return XMLHandle( _node ? _node->NextSiblingElement( _value ) : 0 );
    }

    XMLNode* ToNode()                                                   {
        return _node;
    }
    XMLElement* ToElement()                                     {
        return ( ( _node && _node->ToElement() ) ? _node->ToElement() : 0 );
    }
    XMLText* ToText()                                                   {
        return ( ( _node && _node->ToText() ) ? _node->ToText() : 0 );
    }
    XMLUnknown* ToUnknown()                                     {
        return ( ( _node && _node->ToUnknown() ) ? _node->ToUnknown() : 0 );
    }
    XMLDeclaration* ToDeclaration()                     {
        return ( ( _node && _node->ToDeclaration() ) ? _node->ToDeclaration() : 0 );
    }

private:
    XMLNode* _node;
};


class XMLConstHandle
{
public:
    XMLConstHandle( const XMLNode* node )                                                                                       {
        _node = node;
    }
    XMLConstHandle( const XMLNode& node )                                                                                       {
        _node = &node;
    }
    XMLConstHandle( const XMLConstHandle& ref )                                                                         {
        _node = ref._node;
    }

    XMLConstHandle& operator=( const XMLConstHandle& ref )                                                      {
        _node = ref._node;
        return *this;
    }

    const XMLConstHandle FirstChild() const                                                                                     {
        return XMLConstHandle( _node ? _node->FirstChild() : 0 );
    }
    const XMLConstHandle FirstChildElement( const char* value=0 ) const                         {
        return XMLConstHandle( _node ? _node->FirstChildElement( value ) : 0 );
    }
    const XMLConstHandle LastChild()    const                                                                           {
        return XMLConstHandle( _node ? _node->LastChild() : 0 );
    }
    const XMLConstHandle LastChildElement( const char* _value=0 ) const                         {
        return XMLConstHandle( _node ? _node->LastChildElement( _value ) : 0 );
    }
    const XMLConstHandle PreviousSibling() const                                                                        {
        return XMLConstHandle( _node ? _node->PreviousSibling() : 0 );
    }
    const XMLConstHandle PreviousSiblingElement( const char* _value=0 ) const           {
        return XMLConstHandle( _node ? _node->PreviousSiblingElement( _value ) : 0 );
    }
    const XMLConstHandle NextSibling() const                                                                            {
        return XMLConstHandle( _node ? _node->NextSibling() : 0 );
    }
    const XMLConstHandle NextSiblingElement( const char* _value=0 ) const                       {
        return XMLConstHandle( _node ? _node->NextSiblingElement( _value ) : 0 );
    }


    const XMLNode* ToNode() const                               {
        return _node;
    }
    const XMLElement* ToElement() const                 {
        return ( ( _node && _node->ToElement() ) ? _node->ToElement() : 0 );
    }
    const XMLText* ToText() const                               {
        return ( ( _node && _node->ToText() ) ? _node->ToText() : 0 );
    }
    const XMLUnknown* ToUnknown() const                 {
        return ( ( _node && _node->ToUnknown() ) ? _node->ToUnknown() : 0 );
    }
    const XMLDeclaration* ToDeclaration() const {
        return ( ( _node && _node->ToDeclaration() ) ? _node->ToDeclaration() : 0 );
    }

private:
    const XMLNode* _node;
};


class XMLPrinter : public XMLVisitor
{
public:
    XMLPrinter( FILE* file=0, bool compact = false );
    ~XMLPrinter()       {}

    void PushHeader( bool writeBOM, bool writeDeclaration );
    void OpenElement( const char* name );
    void PushAttribute( const char* name, const char* value );
    void PushAttribute( const char* name, int value );
    void PushAttribute( const char* name, unsigned value );
    void PushAttribute( const char* name, bool value );
    void PushAttribute( const char* name, double value );
    void CloseElement();

    void PushText( const char* text, bool cdata=false );
    void PushText( int value );
    void PushText( unsigned value );
    void PushText( bool value );
    void PushText( float value );
    void PushText( double value );

    void PushComment( const char* comment );

    void PushDeclaration( const char* value );
    void PushUnknown( const char* value );

    virtual bool VisitEnter( const XMLDocument& /*doc*/ );
    virtual bool VisitExit( const XMLDocument& /*doc*/ )                        {
        return true;
    }

    virtual bool VisitEnter( const XMLElement& element, const XMLAttribute* attribute );
    virtual bool VisitExit( const XMLElement& element );

    virtual bool Visit( const XMLText& text );
    virtual bool Visit( const XMLComment& comment );
    virtual bool Visit( const XMLDeclaration& declaration );
    virtual bool Visit( const XMLUnknown& unknown );

    const char* CStr() const {
        return _buffer.Mem();
    }
    int CStrSize() const {
        return _buffer.Size();
    }

private:
    void SealElement();
    void PrintSpace( int depth );
    void PrintString( const char*, bool restrictedEntitySet );  // prints out, after detecting entities.
    void Print( const char* format, ... );

    bool _elementJustOpened;
    bool _firstElement;
    FILE* _fp;
    int _depth;
    int _textDepth;
    bool _processEntities;
    bool _compactMode;

    enum {
        ENTITY_RANGE = 64,
        BUF_SIZE = 200
    };
    bool _entityFlag[ENTITY_RANGE];
    bool _restrictedEntityFlag[ENTITY_RANGE];

    DynArray< const char*, 10 > _stack;
    DynArray< char, 20 > _buffer;
#ifdef _MSC_VER
    DynArray< char, 20 > _accumulator;
#endif
};


}       // tinyxml2


#endif // TINYXML2_INCLUDED