#ifndef XML_TINYXML_H
#define XML_TINYXML_H

/*
  www.sourceforge.net/projects/tinyxml
  Original code (2.0 and earlier )copyright (c) 2000-2006 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.


  F.Gaede, DESY : added #define TIXML_USE_STL  for use with marlin
*/

#ifndef TIXML_USE_STL
#define TIXML_USE_STL
#endif

#ifndef TINYXML_INCLUDED
#define TINYXML_INCLUDED

#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

#ifdef TIXML_USE_STL
#include <string>
#include <iostream>
#include <sstream>
#define TIXML_STRING            std::string
#else
#include "tinystr.h"
#define TIXML_STRING            TiXmlString
#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

#ifdef TIXML_SAFE
#if defined(_MSC_VER) && (_MSC_VER >= 1400 )
// Microsoft visual studio, version 2005 and higher.
#define TIXML_SNPRINTF _snprintf_s
#define TIXML_SNSCANF  _snscanf_s
#elif 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 = 5;
const int TIXML_PATCH_VERSION = 2;

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

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

/**
   If you call the Accept() method, it requires being passed a TiXmlVisitor
   class to handle callbacks. For nodes that contain other nodes (Document, Element)
   you will get called with a VisitEnter/VisitExit pair. Nodes that are always leaves
   are simple called with Visit().

   If you return 'true' from a Visit method, recursive parsing will continue. If you return
   false, <b>no children of this node or its sibilings</b> will be Visited.

   All flavors of Visit methods have a default implementation that returns 'true' (continue
   visiting). You need to only override methods that are interesting to you.

   Generally Accept() is called on the TiXmlDocument, although all nodes suppert Visiting.

   You should never change the document from a callback.

   @sa TiXmlNode::Accept()
*/
class TiXmlVisitor {
public:
  virtual ~TiXmlVisitor() {
  }

  /// Visit a document.
  virtual bool VisitEnter(const TiXmlDocument& /* doc */) {
    return true;
  }
  /// Visit a document.
  virtual bool VisitExit(const TiXmlDocument& /* doc */) {
    return true;
  }

  /// Visit an element.
  virtual bool VisitEnter(const TiXmlElement& /* element */, const TiXmlAttribute* /* firstAttribute */) {
    return true;
  }
  /// Visit an element.
  virtual bool VisitExit(const TiXmlElement& /* element */) {
    return true;
  }

  /// Visit a declaration
  virtual bool Visit(const TiXmlDeclaration& /* declaration */) {
    return true;
  }
  /// Visit a text node
  virtual bool Visit(const TiXmlText& /* text */) {
    return true;
  }
  /// Visit a comment node
  virtual bool Visit(const TiXmlComment& /* comment */) {
    return true;
  }
  /// Visit an unknow node
  virtual bool Visit(const TiXmlUnknown& /* unknown */) {
    return true;
  }
};

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

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

const TiXmlEncoding TIXML_DEFAULT_ENCODING = TIXML_ENCODING_UNKNOWN;

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

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

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

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

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

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

  /**   All TinyXml classes can print themselves to a filestream
        or the string class (TiXmlString in non-STL mode, std::string
        in STL mode.) Either or both cfile and str can be null.

        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
        value 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;
  }   ///< Set a pointer to arbitrary user data.
  void* GetUserData() {
    return userData;
  }   ///< Get a pointer to arbitrary user data.
  const void* GetUserData() const {
    return userData;
  }   ///< Get a pointer to arbitrary user data.

  // 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_DOCUMENT_TOP_ONLY,

    TIXML_ERROR_STRING_COUNT
  };

protected:

  static const char* SkipWhiteSpace(const char*, TiXmlEncoding encoding);
  inline static bool IsWhiteSpace(char c) {
    return (isspace((unsigned char) c) || c == '\n' || c == '\r');
  }
  inline static bool IsWhiteSpace(int c) {
    if (c < 256)
      return IsWhiteSpace((char) c);
    return false;   // Again, only truly correct for English/Latin...but usually works.
  }

#ifdef TIXML_USE_STL
  static bool StreamWhiteSpace(std::istream * in, TIXML_STRING * tag);
  static bool StreamTo(std::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[*((const 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_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 TiXmlNode: public TiXmlBase {
  friend class TiXmlDocument;
  friend class TiXmlElement;

public:
#ifdef TIXML_USE_STL

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

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

      The operator<< and operator>> are not completely symmetric. Writing
      a node to a stream is very well defined. You'll get a nice stream
      of output, without any extra whitespace or newlines.

      But reading is not as well defined. (As it always is.) If you create
      a TiXmlElement (for example) and read that from an input stream,
      the text needs to define an element or junk will result. This is
      true of all input streams, but it's worth keeping in mind.

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

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

#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) {
    value = _value;
  }
#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.
  /// The first child of this node with the matching 'value'. Will be null if none found.
  TiXmlNode* FirstChild(const char * _value) {
    // Call through to the const version - safe since nothing is changed. Exiting syntax: cast this to a const (always safe)
    // call the method, cast the return back to non-const.
    return const_cast<TiXmlNode*>((const_cast<const TiXmlNode*>(this))->FirstChild(_value));
  }
  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) {
    return const_cast<TiXmlNode*>((const_cast<const TiXmlNode*>(this))->LastChild(_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(const TiXmlNode* previous) {
    return const_cast<TiXmlNode*>((const_cast<const TiXmlNode*>(this))->IterateChildren(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, const TiXmlNode* previous) {
    return const_cast<TiXmlNode*>((const_cast<const TiXmlNode*>(this))->IterateChildren(_value, 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, const 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 *_prev) {
    return const_cast<TiXmlNode*>((const_cast<const TiXmlNode*>(this))->PreviousSibling(_prev));
  }

#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* _next) {
    return const_cast<TiXmlNode*>((const_cast<const TiXmlNode*>(this))->NextSibling(_next));
  }

  /** 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() {
    return const_cast<TiXmlElement*>((const_cast<const TiXmlNode*>(this))->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 *_next) {
    return const_cast<TiXmlElement*>((const_cast<const TiXmlNode*>(this))->NextSiblingElement(_next));
  }

  /** Convenience function to get through elements.
      Calls PreviousSibling and ToElement. Will skip all non-Element
      nodes. Returns 0 if there is not another element.
  */
  const TiXmlElement* PreviousSiblingElement() const;
  TiXmlElement* PreviousSiblingElement() {
    return const_cast<TiXmlElement*>((const_cast<const TiXmlNode*>(this))->PreviousSiblingElement());
  }

  /** Convenience function to get through elements.
      Calls PreviousSibling and ToElement. Will skip all non-Element
      nodes. Returns 0 if there is not another element.
  */
  const TiXmlElement* PreviousSiblingElement(const char *) const;
  TiXmlElement* PreviousSiblingElement(const char *_next) {
    return const_cast<TiXmlElement*>((const_cast<const TiXmlNode*>(this))->PreviousSiblingElement(_next));
  }

#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() {
    return const_cast<TiXmlElement*>((const_cast<const TiXmlNode*>(this))->FirstChildElement());
  }

  /// Convenience function to get through elements.
  const TiXmlElement* FirstChildElement(const char * _value) const;
  TiXmlElement* FirstChildElement(const char * _value) {
    return const_cast<TiXmlElement*>((const_cast<const TiXmlNode*>(this))->FirstChildElement(_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() {
    return const_cast<TiXmlDocument*>((const_cast<const TiXmlNode*>(this))->GetDocument());
  }

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

  virtual const TiXmlDocument* ToDocument() const {
    return 0;
  }   ///< Cast to a more defined type. Will return null if not of the requested type.
  virtual const TiXmlElement* ToElement() const {
    return 0;
  }   ///< Cast to a more defined type. Will return null if not of the requested type.
  virtual const TiXmlComment* ToComment() const {
    return 0;
  }   ///< Cast to a more defined type. Will return null if not of the requested type.
  virtual const TiXmlUnknown* ToUnknown() const {
    return 0;
  }   ///< Cast to a more defined type. Will return null if not of the requested type.
  virtual const TiXmlText* ToText() const {
    return 0;
  }   ///< Cast to a more defined type. Will return null if not of the requested type.
  virtual const TiXmlDeclaration* ToDeclaration() const {
    return 0;
  }   ///< Cast to a more defined type. Will return null if not of the requested type.

  virtual TiXmlDocument* ToDocument() {
    return 0;
  }   ///< Cast to a more defined type. Will return null if not of the requested type.
  virtual TiXmlElement* ToElement() {
    return 0;
  }   ///< Cast to a more defined type. Will return null if not of the requested type.
  virtual TiXmlComment* ToComment() {
    return 0;
  }   ///< Cast to a more defined type. Will return null if not of the requested type.
  virtual TiXmlUnknown* ToUnknown() {
    return 0;
  }   ///< Cast to a more defined type. Will return null if not of the requested type.
  virtual TiXmlText* ToText() {
    return 0;
  }   ///< Cast to a more defined type. Will return null if not of the requested type.
  virtual TiXmlDeclaration* ToDeclaration() {
    return 0;
  }   ///< Cast to a more defined type. Will return null if 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;

  /** Accept a hierchical visit the nodes in the TinyXML DOM. Every node in the
      XML tree will be conditionally visited and the host will be called back
      via the TiXmlVisitor interface.

      This is essentially a SAX interface for TinyXML. (Note however it doesn't re-parse
      the XML for the callbacks, so the performance of TinyXML is unchanged by using this
      interface versus any other.)

      The interface has been based on ideas from:

      - http://www.saxproject.org/
      - http://c2.com/cgi/wiki?HierarchicalVisitorPattern

      Which are both good references for "visiting".

      An example of using Accept():
      @verbatim
      TiXmlPrinter printer;
      tinyxmlDoc.Accept( &printer );
      const char* xmlcstr = printer.CStr();
      @endverbatim
  */
  virtual bool Accept(TiXmlVisitor* visitor) 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(std::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 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.
#ifdef TIXML_USE_STL
  const std::string& ValueStr() const {
    return value;
  }                             ///< Return the value of this attribute.
#endif
  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.

  // Get the tinyxml string representation
  const TIXML_STRING& NameTStr() const {
    return name;
  }

  /** 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) {
    name = _name;
  }
  /// STL std::string form.
  void SetValue(const std::string& _value) {
    value = _value;
  }
#endif

  /// Get the next sibling attribute in the DOM. Returns null at end.
  const TiXmlAttribute* Next() const;
  TiXmlAttribute* Next() {
    return const_cast<TiXmlAttribute*>((const_cast<const TiXmlAttribute*>(this))->Next());
  }

  /// Get the previous sibling attribute in the DOM. Returns null at beginning.
  const TiXmlAttribute* Previous() const;
  TiXmlAttribute* Previous() {
    return const_cast<TiXmlAttribute*>((const_cast<const TiXmlAttribute*>(this))->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)  override;

  // Prints this Attribute to a FILE stream.
  virtual void Print(FILE* cfile, int depth) const   override  {
    Print(cfile, depth, 0);
  }
  void Print(FILE* cfile, int depth, TIXML_STRING* str) const;

  // [internal use]
  // Set the document pointer so the attribute can report errors.
  void SetDocument(TiXmlDocument* doc) {
    document = doc;
  }

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

  TiXmlDocument* document;   // A pointer back to a document, for error reporting.
  TIXML_STRING name;TIXML_STRING value;
  TiXmlAttribute* prev;
  TiXmlAttribute* next;
};

/*      A class used to manage a group of attributes.
        It is only used internally, both by the ELEMENT and the DECLARATION.

        The set can be changed transparent to the Element and Declaration
        classes that use it, but NOT transparent to the Attribute
        which has to implement a next() and previous() method. Which makes
        it a bit problematic and prevents the use of STL.

        This version is implemented with circular lists because:
        - I like circular lists
        - it demonstrates some independence from the (typical) doubly linked list.
*/
class TiXmlAttributeSet {
public:
  TiXmlAttributeSet();
  ~TiXmlAttributeSet();

  void Add(TiXmlAttribute* attribute);
  void Remove(TiXmlAttribute* attribute);

  const TiXmlAttribute* First() const {
    return (sentinel.next == &sentinel) ? 0 : sentinel.next;
  }
  TiXmlAttribute* First() {
    return (sentinel.next == &sentinel) ? 0 : sentinel.next;
  }
  const TiXmlAttribute* Last() const {
    return (sentinel.prev == &sentinel) ? 0 : sentinel.prev;
  }
  TiXmlAttribute* Last() {
    return (sentinel.prev == &sentinel) ? 0 : sentinel.prev;
  }

  const TiXmlAttribute* Find(const char* _name) const;
  TiXmlAttribute* Find(const char* _name) {
    return const_cast<TiXmlAttribute*>((const_cast<const TiXmlAttributeSet*>(this))->Find(_name));
  }
#ifdef TIXML_USE_STL
  const TiXmlAttribute* Find(const std::string& _name) const;
  TiXmlAttribute* Find(const std::string& _name) {
    return const_cast<TiXmlAttribute*>((const_cast<const TiXmlAttributeSet*>(this))->Find(_name));
  }

#endif

private:
  //*ME:        Because of hidden/disabled copy-construktor in TiXmlAttribute (sentinel-element),
  //*ME:        this class must be also use a hidden/disabled copy-constructor !!!
  TiXmlAttributeSet(const TiXmlAttributeSet&);   // not allowed
  void operator=(const TiXmlAttributeSet&);   // not allowed (as TiXmlAttribute)

  TiXmlAttribute sentinel;
};

/** The element is a container class. It has a value, the element name,
    and can contain other elements, text, comments, and unknowns.
    Elements also contain an arbitrary number of attributes.
*/
class TiXmlElement: public TiXmlNode {
public:
  /// Construct an element.
  TiXmlElement(const char * in_value);

#ifdef TIXML_USE_STL
  /// std::string constructor.
  TiXmlElement(const std::string& _value);
#endif

  TiXmlElement(const TiXmlElement&);

  void operator=(const TiXmlElement& base);

  virtual ~TiXmlElement();

  /** Given an attribute name, Attribute() returns the attribute
      with that name, or null if none exists.
  */
  const TiXmlAttribute* AttributeNode(const char* name) const {
    return attributeSet.Find(name);
  }

  /** Given an attribute name, Attribute() returns the attribute value
      with that name, or null if none exists.
  */
  const char* Attribute(const char* name) const;

  /** Clear all attribute nodes of this node.
   */
  void ClearAttributes();

  /** Given an attribute name, Attribute() returns the value
      for the attribute of that name, or null if none exists.
      If the attribute exists and can be converted to an integer,
      the integer value will be put in the return 'i', if 'i'
      is non-null.
  */
  const char* Attribute(const char* name, int* i) const;

  /** Given an attribute name, Attribute() returns the value
      for the attribute of that name, or null if none exists.
      If the attribute exists and can be converted to an double,
      the double value will be put in the return 'd', if 'd'
      is non-null.
  */
  const char* Attribute(const char* name, double* d) const;

  /** QueryIntAttribute examines the attribute - it is an alternative to the
      Attribute() method with richer error checking.
      If the attribute 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. If the attribute
      does not exist, then TIXML_NO_ATTRIBUTE is returned.
  */
  int QueryIntAttribute(const char* name, int* _value) const;
  /// QueryDoubleAttribute examines the attribute - see QueryIntAttribute().
  int QueryDoubleAttribute(const char* name, double* _value) const;
  /// QueryFloatAttribute examines the attribute - see QueryIntAttribute().
  int QueryFloatAttribute(const char* name, float* _value) const {
    double d;
    int result = QueryDoubleAttribute(name, &d);
    if (result == TIXML_SUCCESS) {
      *_value = (float) d;
    }
    return result;
  }
#ifdef TIXML_USE_STL
  /** Template form of the attribute query which will try to read the
      attribute into the specified type. Very easy, very powerful, but
      be careful to make sure to call this with the correct type.

      @return TIXML_SUCCESS, TIXML_WRONG_TYPE, or TIXML_NO_ATTRIBUTE
  */
  template <typename T> int QueryValueAttribute(const std::string& name, T* outValue) const {
    const TiXmlAttribute* node = attributeSet.Find(name);
    if (!node)
      return TIXML_NO_ATTRIBUTE;

    std::stringstream sstream(node->ValueStr());
    sstream >> *outValue;
    if (!sstream.fail())
      return TIXML_SUCCESS;
    return TIXML_WRONG_TYPE;
  }
#endif

  /** Sets an attribute of name to a given value. The attribute
      will be created if it does not exist, or changed if it does.
  */
  void SetAttribute(const char* name, const char * _value);

#ifdef TIXML_USE_STL
  const std::string* Attribute(const std::string& name) const;
  const std::string* Attribute(const std::string& name, int* i) const;
  const std::string* Attribute(const std::string& name, double* d) const;
  int QueryIntAttribute(const std::string& name, int* _value) const;
  int QueryDoubleAttribute(const std::string& name, double* _value) const;

  /// STL std::string form.
  void SetAttribute(const std::string& name, const std::string& _value);
  ///< STL std::string form.
  void SetAttribute(const std::string& name, int _value);
#endif

  /** Sets an attribute of name to a given value. The attribute
      will be created if it does not exist, or changed if it does.
  */
  void SetAttribute(const char * name, int value);

  /** Sets an attribute of name to a given value. The attribute
      will be created if it does not exist, or changed if it does.
  */
  void SetDoubleAttribute(const char * name, double value);

  /** Deletes an attribute with the given name.
   */
  void RemoveAttribute(const char * name);
#ifdef TIXML_USE_STL
  void RemoveAttribute(const std::string& name) {
    RemoveAttribute(name.c_str());
  }   ///< STL std::string form.
#endif

  const TiXmlAttribute* FirstAttribute() const {
    return attributeSet.First();
  }             ///< Access the first attribute in this element.
  TiXmlAttribute* FirstAttribute() {
    return attributeSet.First();
  }
  const TiXmlAttribute* LastAttribute() const {
    return attributeSet.Last();
  }             ///< Access the last attribute in this element.
  TiXmlAttribute* LastAttribute() {
    return attributeSet.Last();
  }

  /** Convenience function for easy access to the text inside an element. Although easy
      and concise, GetText() is limited compared to getting the TiXmlText child
      and accessing it directly.

      If the first child of 'this' is a TiXmlText, the GetText()
      returns the character string of the Text node, else null is returned.

      This is a convenient method for getting the text of simple contained text:
      @verbatim
      <foo>This is text</foo>
      const char* str = fooElement->GetText();
      @endverbatim

      'str' will be a pointer to "This is text".

      Note that this function can be misleading. If the element foo was created from
      this XML:
      @verbatim
      <foo><b>This is text</b></foo>
      @endverbatim

      then the value of str would be null. The first child node isn't a text node, it is
      another element. From this XML:
      @verbatim
      <foo>This is <b>text</b></foo>
      @endverbatim
      GetText() will return "This is ".

      WARNING: GetText() accesses a child node - don't become confused with the
      similarly named TiXmlHandle_t::Text() and TiXmlNode::ToText() which are
      safe type casts on the referenced node.
  */
  const char* GetText() const;

  /// Creates a new Element and returns it - the returned element is a copy.
  virtual TiXmlNode* Clone() const override;
  // Print the Element to a FILE stream.
  virtual void Print(FILE* cfile, int depth) const override;

  /*    Attribtue parsing starts: next char past '<'
        returns: next char past '>'
  */
  virtual const char* Parse(const char* p, TiXmlParsingData* data, TiXmlEncoding encoding) override;

  virtual const TiXmlElement* ToElement() const override {
    return this;
  }   ///< Cast to a more defined type. Will return null not of the requested type.
  virtual TiXmlElement* ToElement()  override {
    return this;
  }   ///< Cast to a more defined type. Will return null not of the requested type.

  /** Walk the XML tree visiting this node and all of its children.
   */
  virtual bool Accept(TiXmlVisitor* visitor) const  override;

protected:

  void CopyTo(TiXmlElement* target) const;
  void ClearThis();   // like clear, but initializes 'this' object as well

  // Used to be public [internal use]
#ifdef TIXML_USE_STL
  virtual void StreamIn(std::istream * in, TIXML_STRING * tag) override;
#endif
  /*    [internal use]
        Reads the "value" of the element -- another element, or text.
        This should terminate with the current end tag.
  */
  const char* ReadValue(const char* in, TiXmlParsingData* prevData, TiXmlEncoding encoding);

private:

  TiXmlAttributeSet attributeSet;
};

/**     An XML comment.
 */
class TiXmlComment: public TiXmlNode {
public:
  /// Constructs an empty comment.
  TiXmlComment()
    : TiXmlNode(TiXmlNode::COMMENT) {
  }
  /// Construct a comment from text.
  TiXmlComment(const char* _value)
    : TiXmlNode(TiXmlNode::COMMENT) {
    SetValue(_value);
  }
  TiXmlComment(const TiXmlComment&);
  void operator=(const TiXmlComment& base);

  virtual ~TiXmlComment() {
  }

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

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

  virtual const TiXmlComment* ToComment() const  override  {
    return this;
  }   ///< Cast to a more defined type. Will return null not of the requested type.
  virtual TiXmlComment* ToComment()  override  {
    return this;
  }   ///< Cast to a more defined type. Will return null not of the requested type.

  /** Walk the XML tree visiting this node and all of its children.
   */
  virtual bool Accept(TiXmlVisitor* visitor) const override;

protected:
  void CopyTo(TiXmlComment* target) const;

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

private:

};

/** XML text. A text node can have 2 ways to output the next. "normal" output
    and CDATA. It will default to the mode it was parsed from the XML file and
    you generally want to leave it alone, but you can change the output mode with
    SetCDATA() and query it with CDATA().
*/
class TiXmlText: public TiXmlNode {
  friend class TiXmlElement;
public:
  /** Constructor for text element. By default, it is treated as
      normal, encoded text. If you want it be output as a CDATA text
      element, set the parameter _cdata to 'true'
  */
  TiXmlText(const char * initValue)
    : TiXmlNode(TiXmlNode::TEXT) {
    SetValue(initValue);
    cdata = false;
  }
  virtual ~TiXmlText() {
  }

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

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

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

  /// Queries whether this represents text using a CDATA section.
  bool CDATA() const {
    return cdata;
  }
  /// Turns on or off a CDATA representation of text.
  void SetCDATA(bool _cdata) {
    cdata = _cdata;
  }

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

  virtual const TiXmlText* ToText() const  override {
    return this;
  }   ///< Cast to a more defined type. Will return null not of the requested type.
  virtual TiXmlText* ToText()   override  {
    return this;
  }   ///< Cast to a more defined type. Will return null not of the requested type.

  /** Walk the XML tree visiting this node and all of its children.
   */
  virtual bool Accept(TiXmlVisitor* content) const  override;

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

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

private:
  bool cdata;                   // true if this should be input and output as a CDATA style text element
};

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

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

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

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

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

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

  virtual ~TiXmlDeclaration() {
  }

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

  /// Creates a copy of this Declaration and returns it.
  virtual TiXmlNode* Clone() const   override;
  // Print this declaration to a FILE stream.
  virtual void Print(FILE* cfile, int depth, TIXML_STRING* str) const;
  virtual void Print(FILE* cfile, int depth) const   override  {
    Print(cfile, depth, 0);
  }

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

  virtual const TiXmlDeclaration* ToDeclaration() const   override  {
    return this;
  }   ///< Cast to a more defined type. Will return null not of the requested type.
  virtual TiXmlDeclaration* ToDeclaration()  override {
    return this;
  }   ///< Cast to a more defined type. Will return null not of the requested type.

  /** Walk the XML tree visiting this node and all of its children.
   */
  virtual bool Accept(TiXmlVisitor* visitor) const  override;

protected:
  void CopyTo(TiXmlDeclaration* target) const;
  // used to be public
#ifdef TIXML_USE_STL
  virtual void StreamIn(std::istream * in, TIXML_STRING * tag)  override;
#endif

private:

  TIXML_STRING version;TIXML_STRING encoding;TIXML_STRING standalone;
};

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

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

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

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

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

  virtual const TiXmlUnknown* ToUnknown() const    override  {
    return this;
  }   ///< Cast to a more defined type. Will return null not of the requested type.
  virtual TiXmlUnknown* ToUnknown()    override{
    return this;
  }   ///< Cast to a more defined type. Will return null not of the requested type.

  /** Walk the XML tree visiting this node and all of its children.
   */
  virtual bool Accept(TiXmlVisitor* content) const  override;

protected:
  void CopyTo(TiXmlUnknown* target) const;

#ifdef TIXML_USE_STL
  virtual void StreamIn(std::istream * in, TIXML_STRING * tag)  override;
#endif

private:

};

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

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

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

  virtual ~TiXmlDocument() {
  }

  /** Load a file using the current document value.
      Returns true if successful. Will delete any existing
      document data before loading.
  */
  bool LoadFile(TiXmlEncoding encoding = TIXML_DEFAULT_ENCODING);
  /// Save a file using the current document value. Returns true if successful.
  bool SaveFile() const;
  /// Load a file using the given filename. Returns true if successful.
  bool LoadFile(const char * filename, TiXmlEncoding encoding = TIXML_DEFAULT_ENCODING);
  /// Save a file using the given filename. Returns true if successful.
  bool SaveFile(const char * filename) const;
  /** Load a file using the given FILE*. Returns true if successful. Note that this method
      doesn't stream - the entire object pointed at by the FILE*
      will be interpreted as an XML file. TinyXML doesn't stream in XML from the current
      file location. Streaming may be added in the future.
  */
  bool LoadFile(FILE*, TiXmlEncoding encoding = TIXML_DEFAULT_ENCODING);
  /// Save a file using the given FILE*. Returns true if successful.
  bool SaveFile(FILE*) const;

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

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

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

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

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

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

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

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

  /** SetTabSize() allows the error reporting functions (ErrorRow() and ErrorCol())
      to report the correct values for row and column. It does not change the output
      or input in any way.

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

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

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

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

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

  int TabSize() const {
    return tabsize;
  }

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

  /** Write the document to standard out using formatted printing ("pretty print"). */
  void Print() const    {
    Print(stdout, 0);
  }

  /* Write the document to a string using formatted printing ("pretty print"). This
     will allocate a character array (new char[]) and return it as a pointer. The
     calling code pust call delete[] on the return char* to avoid a memory leak.
  */
  //char* PrintToMemory() const;
  /// Print this Document to a FILE stream.
  virtual void Print(FILE* cfile, int depth = 0) const   override;
  // [internal use]
  void SetError(int err, const char* errorLocation, TiXmlParsingData* prevData, TiXmlEncoding encoding);

  virtual const TiXmlDocument* ToDocument() const override  {
    return this;
  }   ///< Cast to a more defined type. Will return null not of the requested type.
  virtual TiXmlDocument* ToDocument()   override  {
    return this;
  }   ///< Cast to a more defined type. Will return null not of the requested type.

  /** Walk the XML tree visiting this node and all of its children.
   */
  virtual bool Accept(TiXmlVisitor* content) const  override;

protected:
  // [internal use]
  virtual TiXmlNode* Clone() const   override;
#ifdef TIXML_USE_STL
  virtual void StreamIn(std::istream * in, TIXML_STRING * tag)  override;
#endif

private:
  void CopyTo(TiXmlDocument* target) const;

  bool error;
  int errorId;TIXML_STRING errorDesc;
  int tabsize;
  TiXmlCursor errorLocation;
  bool useMicrosoftBOM;         // the UTF-8 BOM were found when read. Note this, and try to write.
};

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

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

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

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

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

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

   Which is MUCH more concise and useful.

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

   What they should not be used for is iteration:

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

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

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

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

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

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

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

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

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

  /** @deprecated use ToNode.
      Return the handle as a TiXmlNode. This may return null.
  */
  TiXmlNode* Node() const {
    return ToNode();
  }
  /** @deprecated use ToElement.
      Return the handle as a TiXmlElement. This may return null.
  */
  TiXmlElement* Element() const {
    return ToElement();
  }
  /**   @deprecated use ToText()
        Return the handle as a TiXmlText. This may return null.
  */
  TiXmlText* Text() const {
    return ToText();
  }
  /** @deprecated use ToUnknown()
      Return the handle as a TiXmlUnknown. This may return null.
  */
  TiXmlUnknown* Unknown() const {
    return ToUnknown();
  }

private:
  TiXmlNode* node;
};

/** Print to memory functionality. The TiXmlPrinter is useful when you need to:

    -# Print to memory (especially in non-STL mode)
    -# Control formatting (line endings, etc.)

    When constructed, the TiXmlPrinter is in its default "pretty printing" mode.
    Before calling Accept() you can call methods to control the printing
    of the XML document. After TiXmlNode::Accept() is called, the printed document can
    be accessed via the CStr(), Str(), and Size() methods.

    TiXmlPrinter uses the Visitor API.
    @verbatim
    TiXmlPrinter printer;
    printer.SetIndent( "\t" );

    doc.Accept( &printer );
    fprintf( stdout, "%s", printer.CStr() );
    @endverbatim
*/
class TiXmlPrinter: public TiXmlVisitor {
public:
  TiXmlPrinter()
    : depth(0), simpleTextPrint(false), buffer(), indent("    "), lineBreak("\n") {
  }

  virtual bool VisitEnter(const TiXmlDocument& doc)  override;
  virtual bool VisitExit(const TiXmlDocument& doc)  override;

  virtual bool VisitEnter(const TiXmlElement& element, const TiXmlAttribute* firstAttribute)  override;
  virtual bool VisitExit(const TiXmlElement& element)  override;

  virtual bool Visit(const TiXmlDeclaration& declaration)  override;
  virtual bool Visit(const TiXmlText& text)  override;
  virtual bool Visit(const TiXmlComment& comment)  override;
  virtual bool Visit(const TiXmlUnknown& unknown)  override;

  /** Set the indent characters for printing. By default 4 spaces
      but tab (\t) is also useful, or null/empty string for no indentation.
  */
  void SetIndent(const char* _indent) {
    indent = _indent ? _indent : "";
  }
  /// Query the indention string.
  const char* Indent() {
    return indent.c_str();
  }
  /** Set the line breaking string. By default set to newline (\n).
      Some operating systems prefer other characters, or can be
      set to the null/empty string for no indenation.
  */
  void SetLineBreak(const char* _lineBreak) {
    lineBreak = _lineBreak ? _lineBreak : "";
  }
  /// Query the current line breaking string.
  const char* LineBreak() {
    return lineBreak.c_str();
  }

  /** Switch over to "stream printing" which is the most dense formatting without
      linebreaks. Common when the XML is needed for network transmission.
  */
  void SetStreamPrinting() {
    indent = "";
    lineBreak = "";
  }
  /// Return the result.
  const char* CStr() {
    return buffer.c_str();
  }
  /// Return the length of the result string.
  size_t Size() {
    return buffer.size();
  }

#ifdef TIXML_USE_STL
  /// Return the result.
  const std::string& Str() {
    return buffer;
  }
#endif

private:
  void DoIndent() {
    for (int i = 0; i < depth; ++i)
      buffer += indent;
  }
  void DoLineBreak() {
    buffer += lineBreak;
  }

  int depth;
  bool simpleTextPrint;TIXML_STRING buffer;TIXML_STRING indent;TIXML_STRING lineBreak;
};

#ifdef _MSC_VER
#pragma warning( pop )
#endif

#endif


#endif
