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 BT_TINYXML2_INCLUDED
#define BT_TINYXML2_INCLUDED

#if defined(ANDROID_NDK) || defined(__BORLANDC__) || defined(__QNXNTO__)
#   include <ctype.h>
#   include <limits.h>
#   include <stdio.h>
#   include <stdlib.h>
#   include <string.h>
#       if defined(__PS3__)
#               include <stddef.h>
#       endif
#else
#   include <cctype>
#   include <climits>
#   include <cstdio>
#   include <cstdlib>
#   include <cstring>
#endif
#include <stdint.h>

/*
   TODO: intern strings instead of allocation.
*/
/*
        gcc:
        g++ -Wall -DTINYXML2_DEBUG 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__)
#   ifndef TINYXML2_DEBUG
#       define TINYXML2_DEBUG
#   endif
#endif

#ifdef _MSC_VER
#   pragma warning(push)
#   pragma warning(disable: 4251)
#endif

#ifdef _WIN32
#   ifdef TINYXML2_EXPORT
#       define TINYXML2_LIB __declspec(dllexport)
#   elif defined(TINYXML2_IMPORT)
#       define TINYXML2_LIB __declspec(dllimport)
#   else
#       define TINYXML2_LIB
#   endif
#elif __GNUC__ >= 4
#   define TINYXML2_LIB __attribute__((visibility("hidden")))
#else
#   define TINYXML2_LIB
#endif


#if defined(TINYXML2_DEBUG)
#   if defined(_MSC_VER)
#       // "(void)0," is for suppressing C4127 warning in "assert(false)", "assert(true)" and the like
#       define TIXMLASSERT( x )           if ( !((void)0,(x))) { __debugbreak(); }
#   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


/* Versioning, past 1.0.14:
        http://semver.org/
*/
static const int TIXML2_MAJOR_VERSION = 7;
static const int TIXML2_MINOR_VERSION = 0;
static const int TIXML2_PATCH_VERSION = 1;

#define TINYXML2_MAJOR_VERSION 7
#define TINYXML2_MINOR_VERSION 0
#define TINYXML2_PATCH_VERSION 1

// A fixed element depth limit is problematic. There needs to be a
// limit to avoid a stack overflow. However, that limit varies per
// system, and the capacity of the stack. On the other hand, it's a trivial
// attack that can result from ill, malicious, or even correctly formed XML,
// so there needs to be a limit in place.
static const int TINYXML2_MAX_ELEMENT_DEPTH = 100;

namespace BT_TinyXML2
{
class XMLDocument;
class XMLElement;
class XMLAttribute;
class XMLComment;
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[]

    Isn't clear why TINYXML2_LIB is needed; but seems to fix #719
*/
class TINYXML2_LIB StrPair
{
public:
    enum {
        NEEDS_ENTITY_PROCESSING                 = 0x01,
        NEEDS_NEWLINE_NORMALIZATION             = 0x02,
        NEEDS_WHITESPACE_COLLAPSING     = 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 ) {
        TIXMLASSERT( start );
        TIXMLASSERT( end );
        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, int* curLineNumPtr );
    char* ParseName( char* in );

    void TransferTo( StrPair* other );
        void Reset();

private:
    void CollapseWhitespace();

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

    int     _flags;
    char*   _start;
    char*   _end;

    StrPair( const StrPair& other );    // not supported
    void operator=( const StrPair& other );     // not supported, use TransferTo()
};


/*
        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 INITIAL_SIZE>
class DynArray
{
public:
    DynArray() :
        _mem( _pool ),
        _allocated( INITIAL_SIZE ),
        _size( 0 )
    {
    }

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

    void Clear() {
        _size = 0;
    }

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

    T* PushArr( int count ) {
        TIXMLASSERT( count >= 0 );
        TIXMLASSERT( _size <= INT_MAX - count );
        EnsureCapacity( _size+count );
        T* ret = &_mem[_size];
        _size += count;
        return ret;
    }

    T Pop() {
        TIXMLASSERT( _size > 0 );
        --_size;
        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];
    }

    const T& PeekTop() const            {
        TIXMLASSERT( _size > 0 );
        return _mem[ _size - 1];
    }

    int Size() const                                    {
        TIXMLASSERT( _size >= 0 );
        return _size;
    }

    int Capacity() const                                {
        TIXMLASSERT( _allocated >= INITIAL_SIZE );
        return _allocated;
    }

        void SwapRemove(int i) {
                TIXMLASSERT(i >= 0 && i < _size);
                TIXMLASSERT(_size > 0);
                _mem[i] = _mem[_size - 1];
                --_size;
        }

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

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

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

    void EnsureCapacity( int cap ) {
        TIXMLASSERT( cap > 0 );
        if ( cap > _allocated ) {
            TIXMLASSERT( cap <= INT_MAX / 2 );
            int newAllocated = cap * 2;
            T* newMem = new T[newAllocated];
            TIXMLASSERT( newAllocated >= _size );
            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[INITIAL_SIZE];
    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 ITEM_SIZE >
class MemPoolT : public MemPool
{
public:
    MemPoolT() : _blockPtrs(), _root(0), _currentAllocs(0), _nAllocs(0), _maxAllocs(0), _nUntracked(0)  {}
    ~MemPoolT() {
        MemPoolT< ITEM_SIZE >::Clear();
    }

    void Clear() {
        // Delete the blocks.
        while( !_blockPtrs.Empty()) {
            Block* lastBlock = _blockPtrs.Pop();
            delete lastBlock;
        }
        _root = 0;
        _currentAllocs = 0;
        _nAllocs = 0;
        _maxAllocs = 0;
        _nUntracked = 0;
    }

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

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

            Item* blockItems = block->items;
            for( int i = 0; i < ITEMS_PER_BLOCK - 1; ++i ) {
                blockItems[i].next = &(blockItems[i + 1]);
            }
            blockItems[ITEMS_PER_BLOCK - 1].next = 0;
            _root = blockItems;
        }
        Item* const result = _root;
        TIXMLASSERT( result != 0 );
        _root = _root->next;

        ++_currentAllocs;
        if ( _currentAllocs > _maxAllocs ) {
            _maxAllocs = _currentAllocs;
        }
        ++_nAllocs;
        ++_nUntracked;
        return result;
    }

    virtual void Free( void* mem ) {
        if ( !mem ) {
            return;
        }
        --_currentAllocs;
        Item* item = static_cast<Item*>( mem );
#ifdef TINYXML2_DEBUG
        memset( item, 0xfe, sizeof( *item ) );
#endif
        item->next = _root;
        _root = item;
    }
    void Trace( const char* name ) {
        printf( "Mempool %s watermark=%d [%dk] current=%d size=%d nAlloc=%d blocks=%d\n",
                name, _maxAllocs, _maxAllocs * ITEM_SIZE / 1024, _currentAllocs,
                ITEM_SIZE, _nAllocs, _blockPtrs.Size() );
    }

    void SetTracked() {
        --_nUntracked;
    }

    int Untracked() const {
        return _nUntracked;
    }

        // This number is perf sensitive. 4k seems like a good tradeoff on my machine.
        // The test file is large, 170k.
        // Release:             VS2010 gcc(no opt)
        //              1k:             4000
        //              2k:             4000
        //              4k:             3900    21000
        //              16k:    5200
        //              32k:    4300
        //              64k:    4000    21000
    // Declared public because some compilers do not accept to use ITEMS_PER_BLOCK
    // in private part if ITEMS_PER_BLOCK is private
    enum { ITEMS_PER_BLOCK = (4 * 1024) / ITEM_SIZE };

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

    union Item {
        Item*   next;
        char    itemData[ITEM_SIZE];
    };
    struct Block {
        Item items[ITEMS_PER_BLOCK];
    };
    DynArray< Block*, 10 > _blockPtrs;
    Item* _root;

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



class TINYXML2_LIB 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;
    }
};

// WARNING: must match XMLDocument::_errorNames[]
enum XMLError {
    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_PARSING_ELEMENT,
    XML_ERROR_PARSING_ATTRIBUTE,
    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,
        XML_ELEMENT_DEPTH_EXCEEDED,

        XML_ERROR_COUNT
};


/*
        Utility functionality.
*/
class TINYXML2_LIB XMLUtil
{
public:
    static const char* SkipWhiteSpace( const char* p, int* curLineNumPtr )      {
        TIXMLASSERT( p );

        while( IsWhiteSpace(*p) ) {
            if (curLineNumPtr && *p == '\n') {
                ++(*curLineNumPtr);
            }
            ++p;
        }
        TIXMLASSERT( p );
        return p;
    }
    static char* SkipWhiteSpace( char* p, int* curLineNumPtr )                          {
        return const_cast<char*>( SkipWhiteSpace( const_cast<const char*>(p), curLineNumPtr ) );
    }

    // 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 bool IsWhiteSpace( char p )                                  {
        return !IsUTF8Continuation(p) && isspace( static_cast<unsigned char>(p) );
    }

    inline static bool IsNameStartChar( unsigned char ch ) {
        if ( ch >= 128 ) {
            // This is a heuristic guess in attempt to not implement Unicode-aware isalpha()
            return true;
        }
        if ( isalpha( ch ) ) {
            return true;
        }
        return ch == ':' || ch == '_';
    }

    inline static bool IsNameChar( unsigned char ch ) {
        return IsNameStartChar( ch )
               || isdigit( ch )
               || ch == '.'
               || ch == '-';
    }

    inline static bool StringEqual( const char* p, const char* q, int nChar=INT_MAX )  {
        if ( p == q ) {
            return true;
        }
        TIXMLASSERT( p );
        TIXMLASSERT( q );
        TIXMLASSERT( nChar >= 0 );
        return strncmp( p, q, nChar ) == 0;
    }

    inline static bool IsUTF8Continuation( char p ) {
        return ( p & 0x80 ) != 0;
    }

    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 );
        static void ToStr(int64_t 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 );
        static bool ToInt64(const char* str, int64_t* value);

        // Changes what is serialized for a boolean value.
        // Default to "true" and "false". Shouldn't be changed
        // unless you have a special testing or compatibility need.
        // Be careful: static, global, & not thread safe.
        // Be sure to set static const memory as parameters.
        static void SetBoolSerialization(const char* writeTrue, const char* writeFalse);

private:
        static const char* writeBoolTrue;
        static const char* writeBoolFalse;
};


class TINYXML2_LIB XMLNode
{
    friend class XMLDocument;
    friend class XMLElement;
public:

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

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

    int GetLineNum() const { return _parseLineNum; }

    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* name = 0 ) const;

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

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

    XMLNode*            LastChild()                                                             {
        return _lastChild;
    }

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

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

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

    XMLNode*    PreviousSibling()                                                       {
        return _prev;
    }

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

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

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

    XMLNode*    NextSibling()                                                           {
        return _next;
    }

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

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

    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;

        XMLNode* DeepClone( XMLDocument* target ) const;

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

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

        void SetUserData(void* userData)        { _userData = userData; }

        void* GetUserData() const                       { return _userData; }

protected:
    explicit XMLNode( XMLDocument* );
    virtual ~XMLNode();

    virtual char* ParseDeep( char* p, StrPair* parentEndTag, int* curLineNumPtr);

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

    XMLNode*            _firstChild;
    XMLNode*            _lastChild;

    XMLNode*            _prev;
    XMLNode*            _next;

        void*                   _userData;

private:
    MemPool*            _memPool;
    void Unlink( XMLNode* child );
    static void DeleteNode( XMLNode* node );
    void InsertChildPreamble( XMLNode* insertThis ) const;
    const XMLElement* ToElementWithName( const char* name ) const;

    XMLNode( const XMLNode& );  // not supported
    XMLNode& operator=( const XMLNode& );       // not supported
};


class TINYXML2_LIB XMLText : public XMLNode
{
    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;
    }

    virtual XMLNode* ShallowClone( XMLDocument* document ) const;
    virtual bool ShallowEqual( const XMLNode* compare ) const;

protected:
    explicit XMLText( XMLDocument* doc )        : XMLNode( doc ), _isCData( false )     {}
    virtual ~XMLText()                                                                                          {}

    char* ParseDeep( char* p, StrPair* parentEndTag, int* curLineNumPtr );

private:
    bool _isCData;

    XMLText( const XMLText& );  // not supported
    XMLText& operator=( const XMLText& );       // not supported
};


class TINYXML2_LIB 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;

    virtual XMLNode* ShallowClone( XMLDocument* document ) const;
    virtual bool ShallowEqual( const XMLNode* compare ) const;

protected:
    explicit XMLComment( XMLDocument* doc );
    virtual ~XMLComment();

    char* ParseDeep( char* p, StrPair* parentEndTag, int* curLineNumPtr);

private:
    XMLComment( const XMLComment& );    // not supported
    XMLComment& operator=( const XMLComment& ); // not supported
};


class TINYXML2_LIB 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;

    virtual XMLNode* ShallowClone( XMLDocument* document ) const;
    virtual bool ShallowEqual( const XMLNode* compare ) const;

protected:
    explicit XMLDeclaration( XMLDocument* doc );
    virtual ~XMLDeclaration();

    char* ParseDeep( char* p, StrPair* parentEndTag, int* curLineNumPtr );

private:
    XMLDeclaration( const XMLDeclaration& );    // not supported
    XMLDeclaration& operator=( const XMLDeclaration& ); // not supported
};


class TINYXML2_LIB 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;

    virtual XMLNode* ShallowClone( XMLDocument* document ) const;
    virtual bool ShallowEqual( const XMLNode* compare ) const;

protected:
    explicit XMLUnknown( XMLDocument* doc );
    virtual ~XMLUnknown();

    char* ParseDeep( char* p, StrPair* parentEndTag, int* curLineNumPtr );

private:
    XMLUnknown( const XMLUnknown& );    // not supported
    XMLUnknown& operator=( const XMLUnknown& ); // not supported
};



class TINYXML2_LIB XMLAttribute
{
    friend class XMLElement;
public:
    const char* Name() const;

    const char* Value() const;

    int GetLineNum() const { return _parseLineNum; }

    const XMLAttribute* Next() const {
        return _next;
    }

        int     IntValue() const {
                int i = 0;
                QueryIntValue(&i);
                return i;
        }

        int64_t Int64Value() const {
                int64_t i = 0;
                QueryInt64Value(&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 QueryInt64Value(int64_t* 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(int64_t value);
    void SetAttribute( bool value );
    void SetAttribute( double value );
    void SetAttribute( float value );

private:
    enum { BUF_SIZE = 200 };

    XMLAttribute() : _name(), _value(),_parseLineNum( 0 ), _next( 0 ), _memPool( 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, int* curLineNumPtr );

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


class TINYXML2_LIB XMLElement : public XMLNode
{
    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, int defaultValue = 0) const;
        unsigned UnsignedAttribute(const char* name, unsigned defaultValue = 0) const;
        int64_t Int64Attribute(const char* name, int64_t defaultValue = 0) const;
        bool BoolAttribute(const char* name, bool defaultValue = false) const;
        double DoubleAttribute(const char* name, double defaultValue = 0) const;
        float FloatAttribute(const char* name, float defaultValue = 0) const;

    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 QueryInt64Attribute(const char* name, int64_t* value) const {
                const XMLAttribute* a = FindAttribute(name);
                if (!a) {
                        return XML_NO_ATTRIBUTE;
                }
                return a->QueryInt64Value(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 );
    }

        XMLError QueryStringAttribute(const char* name, const char** value) const {
                const XMLAttribute* a = FindAttribute(name);
                if (!a) {
                        return XML_NO_ATTRIBUTE;
                }
                *value = a->Value();
                return XML_SUCCESS;
        }



        XMLError QueryAttribute( const char* name, int* value ) const {
                return QueryIntAttribute( name, value );
        }

        XMLError QueryAttribute( const char* name, unsigned int* value ) const {
                return QueryUnsignedAttribute( name, value );
        }

        XMLError QueryAttribute(const char* name, int64_t* value) const {
                return QueryInt64Attribute(name, value);
        }

        XMLError QueryAttribute( const char* name, bool* value ) const {
                return QueryBoolAttribute( name, value );
        }

        XMLError QueryAttribute( const char* name, double* value ) const {
                return QueryDoubleAttribute( name, value );
        }

        XMLError QueryAttribute( const char* name, float* value ) const {
                return QueryFloatAttribute( name, 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, int64_t 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 SetAttribute( const char* name, float 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;

        void SetText( const char* inText );
    void SetText( int value );
    void SetText( unsigned value );
        void SetText(int64_t value);
    void SetText( bool value );
    void SetText( double value );
    void SetText( float value );

    XMLError QueryIntText( int* ival ) const;
    XMLError QueryUnsignedText( unsigned* uval ) const;
        XMLError QueryInt64Text(int64_t* uval) const;
    XMLError QueryBoolText( bool* bval ) const;
    XMLError QueryDoubleText( double* dval ) const;
    XMLError QueryFloatText( float* fval ) const;

        int IntText(int defaultValue = 0) const;

        unsigned UnsignedText(unsigned defaultValue = 0) const;
        int64_t Int64Text(int64_t defaultValue = 0) const;
        bool BoolText(bool defaultValue = false) const;
        double DoubleText(double defaultValue = 0) const;
        float FloatText(float defaultValue = 0) const;

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

protected:
    char* ParseDeep( char* p, StrPair* parentEndTag, int* curLineNumPtr );

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

    XMLAttribute* FindOrCreateAttribute( const char* name );
    char* ParseAttributes( char* p, int* curLineNumPtr );
    static void DeleteAttribute( XMLAttribute* attribute );
    XMLAttribute* CreateAttribute();

    enum { BUF_SIZE = 200 };
    ElementClosingType _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 TINYXML2_LIB XMLDocument : public XMLNode
{
    friend class XMLElement;
    // Gives access to SetError and Push/PopDepth, but over-access for everything else.
    // Wishing C++ had "internal" scope.
    friend class XMLNode;
    friend class XMLText;
    friend class XMLComment;
    friend class XMLDeclaration;
    friend class XMLUnknown;
public:
    XMLDocument( bool processEntities = true, Whitespace whitespaceMode = PRESERVE_WHITESPACE );
    ~XMLDocument();

    virtual XMLDocument* ToDocument()                           {
        TIXMLASSERT( this == _document );
        return this;
    }
    virtual const XMLDocument* ToDocument() const       {
        TIXMLASSERT( this == _document );
        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 _whitespaceMode;
    }

    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 ) const;
    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 );

    void ClearError() {
        SetError(XML_SUCCESS, 0, 0);
    }

    bool Error() const {
        return _errorID != XML_SUCCESS;
    }
    XMLError  ErrorID() const {
        return _errorID;
    }
        const char* ErrorName() const;
    static const char* ErrorIDToName(XMLError errorID);

        const char* ErrorStr() const;

    void PrintError() const;

    int ErrorLineNum() const
    {
        return _errorLineNum;
    }

    void Clear();

        void DeepCopy(XMLDocument* target) const;

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

        // internal
        void MarkInUse(XMLNode*);

    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

    bool                        _writeBOM;
    bool                        _processEntities;
    XMLError            _errorID;
    Whitespace          _whitespaceMode;
    mutable StrPair     _errorStr;
    int             _errorLineNum;
    char*                       _charBuffer;
    int                         _parseCurLineNum;
        int                             _parsingDepth;
        // Memory tracking does add some overhead.
        // However, the code assumes that you don't
        // have a bunch of unlinked nodes around.
        // Therefore it takes less memory to track
        // in the document vs. a linked list in the XMLNode,
        // and the performance is the same.
        DynArray<XMLNode*, 10> _unlinked;

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

        static const char* _errorNames[XML_ERROR_COUNT];

    void Parse();

    void SetError( XMLError error, int lineNum, const char* format, ... );

        // Something of an obvious security hole, once it was discovered.
        // Either an ill-formed XML or an excessively deep one can overflow
        // the stack. Track stack depth, and error out if needed.
        class DepthTracker {
        public:
                explicit DepthTracker(XMLDocument * document) {
                        this->_document = document;
                        document->PushDepth();
                }
                ~DepthTracker() {
                        _document->PopDepth();
                }
        private:
                XMLDocument * _document;
        };
        void PushDepth();
        void PopDepth();

    template<class NodeType, int PoolElementSize>
    NodeType* CreateUnlinkedNode( MemPoolT<PoolElementSize>& pool );
};

template<class NodeType, int PoolElementSize>
inline NodeType* XMLDocument::CreateUnlinkedNode( MemPoolT<PoolElementSize>& pool )
{
    TIXMLASSERT( sizeof( NodeType ) == PoolElementSize );
    TIXMLASSERT( sizeof( NodeType ) == pool.ItemSize() );
    NodeType* returnNode = new (pool.Alloc()) NodeType( this );
    TIXMLASSERT( returnNode );
    returnNode->_memPool = &pool;

        _unlinked.Push(returnNode);
    return returnNode;
}

class TINYXML2_LIB XMLHandle
{
public:
    explicit XMLHandle( XMLNode* node ) : _node( node ) {
    }
    explicit 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* name = 0 )                                         {
        return XMLHandle( _node ? _node->FirstChildElement( name ) : 0 );
    }
    XMLHandle LastChild()                                                                                                       {
        return XMLHandle( _node ? _node->LastChild() : 0 );
    }
    XMLHandle LastChildElement( const char* name = 0 )                                          {
        return XMLHandle( _node ? _node->LastChildElement( name ) : 0 );
    }
    XMLHandle PreviousSibling()                                                                                         {
        return XMLHandle( _node ? _node->PreviousSibling() : 0 );
    }
    XMLHandle PreviousSiblingElement( const char* name = 0 )                            {
        return XMLHandle( _node ? _node->PreviousSiblingElement( name ) : 0 );
    }
    XMLHandle NextSibling()                                                                                                     {
        return XMLHandle( _node ? _node->NextSibling() : 0 );
    }
    XMLHandle NextSiblingElement( const char* name = 0 )                                        {
        return XMLHandle( _node ? _node->NextSiblingElement( name ) : 0 );
    }

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

private:
    XMLNode* _node;
};


class TINYXML2_LIB XMLConstHandle
{
public:
    explicit XMLConstHandle( const XMLNode* node ) : _node( node ) {
    }
    explicit 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* name = 0 ) const                                {
        return XMLConstHandle( _node ? _node->FirstChildElement( name ) : 0 );
    }
    const XMLConstHandle LastChild()    const                                                                           {
        return XMLConstHandle( _node ? _node->LastChild() : 0 );
    }
    const XMLConstHandle LastChildElement( const char* name = 0 ) const                         {
        return XMLConstHandle( _node ? _node->LastChildElement( name ) : 0 );
    }
    const XMLConstHandle PreviousSibling() const                                                                        {
        return XMLConstHandle( _node ? _node->PreviousSibling() : 0 );
    }
    const XMLConstHandle PreviousSiblingElement( const char* name = 0 ) const           {
        return XMLConstHandle( _node ? _node->PreviousSiblingElement( name ) : 0 );
    }
    const XMLConstHandle NextSibling() const                                                                            {
        return XMLConstHandle( _node ? _node->NextSibling() : 0 );
    }
    const XMLConstHandle NextSiblingElement( const char* name = 0 ) const                       {
        return XMLConstHandle( _node ? _node->NextSiblingElement( name ) : 0 );
    }


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

private:
    const XMLNode* _node;
};


class TINYXML2_LIB XMLPrinter : public XMLVisitor
{
public:
    XMLPrinter( FILE* file=0, bool compact = false, int depth = 0 );
    virtual ~XMLPrinter()       {}

    void PushHeader( bool writeBOM, bool writeDeclaration );
    void OpenElement( const char* name, bool compactMode=false );
    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, int64_t value);
        void PushAttribute( const char* name, bool value );
    void PushAttribute( const char* name, double value );
    virtual void CloseElement( bool compactMode=false );

    void PushText( const char* text, bool cdata=false );
    void PushText( int value );
    void PushText( unsigned value );
        void PushText(int64_t 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();
    }
    void ClearBuffer() {
        _buffer.Clear();
        _buffer.Push(0);
                _firstElement = true;
    }

protected:
        virtual bool CompactMode( const XMLElement& )   { return _compactMode; }

    virtual void PrintSpace( int depth );
    void Print( const char* format, ... );
    void Write( const char* data, size_t size );
    inline void Write( const char* data )           { Write( data, strlen( data ) ); }
    void Putc( char ch );

    void SealElementIfJustOpened();
    bool _elementJustOpened;
    DynArray< const char*, 10 > _stack;

private:
    void PrintString( const char*, bool restrictedEntitySet );  // prints out, after detecting entities.

    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< char, 20 > _buffer;

    // Prohibit cloning, intentionally not implemented
    XMLPrinter( const XMLPrinter& );
    XMLPrinter& operator=( const XMLPrinter& );
};


}       // tinyxml2

#if defined(_MSC_VER)
#   pragma warning(pop)
#endif

#endif // BT_TINYXML2_INCLUDED