// @(#)root/xml:$Id$
// Author: Sergey Linev  10.05.2004

/*************************************************************************
 * Copyright (C) 1995-2004, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/

#ifndef ROOT_TXMLEngine
#define ROOT_TXMLEngine

#include "TObject.h"

typedef void *XMLNodePointer_t;
typedef void *XMLNsPointer_t;
typedef void *XMLAttrPointer_t;
typedef void *XMLDocPointer_t;

class TXMLInputStream;
class TXMLOutputStream;
class TString;

class TXMLEngine : public TObject {

protected:
   char *Makestr(const char *str);
   char *Makenstr(const char *start, int len);
   XMLNodePointer_t AllocateNode(int namelen, XMLNodePointer_t parent);
   XMLAttrPointer_t AllocateAttr(int namelen, int valuelen, XMLNodePointer_t xmlnode);
   XMLNsPointer_t FindNs(XMLNodePointer_t xmlnode, const char *nsname);
   void TruncateNsExtension(XMLNodePointer_t xmlnode);
   void UnpackSpecialCharacters(char *target, const char *source, int srclen);
   void OutputValue(char *value, TXMLOutputStream *out);
   void SaveNode(XMLNodePointer_t xmlnode, TXMLOutputStream *out, Int_t layout, Int_t level);
   XMLNodePointer_t ReadNode(XMLNodePointer_t xmlparent, TXMLInputStream *inp, Int_t &resvalue);
   void DisplayError(Int_t error, Int_t linenumber);
   XMLDocPointer_t ParseStream(TXMLInputStream *input);

   Bool_t fSkipComments; //! if true, do not create comments nodes in document during parsing

public:
   TXMLEngine();
   ~TXMLEngine() override;

   void SetSkipComments(Bool_t on = kTRUE) { fSkipComments = on; }
   Bool_t GetSkipComments() const { return fSkipComments; }

   Bool_t HasAttr(XMLNodePointer_t xmlnode, const char *name);
   const char *GetAttr(XMLNodePointer_t xmlnode, const char *name);
   Int_t GetIntAttr(XMLNodePointer_t node, const char *name);
   XMLAttrPointer_t NewAttr(XMLNodePointer_t xmlnode, XMLNsPointer_t, const char *name, const char *value);
   XMLAttrPointer_t NewIntAttr(XMLNodePointer_t xmlnode, const char *name, Int_t value);
   void FreeAttr(XMLNodePointer_t xmlnode, const char *name);
   void FreeAllAttr(XMLNodePointer_t xmlnode);
   XMLAttrPointer_t GetFirstAttr(XMLNodePointer_t xmlnode);
   XMLAttrPointer_t GetNextAttr(XMLAttrPointer_t xmlattr);
   const char *GetAttrName(XMLAttrPointer_t xmlattr);
   const char *GetAttrValue(XMLAttrPointer_t xmlattr);
   XMLNodePointer_t NewChild(XMLNodePointer_t parent, XMLNsPointer_t ns, const char *name, const char *content = nullptr);
   XMLNsPointer_t NewNS(XMLNodePointer_t xmlnode, const char *reference, const char *name = nullptr);
   XMLNsPointer_t GetNS(XMLNodePointer_t xmlnode);
   const char *GetNSName(XMLNsPointer_t ns);
   const char *GetNSReference(XMLNsPointer_t ns);
   void AddChild(XMLNodePointer_t parent, XMLNodePointer_t child);
   void AddChildFirst(XMLNodePointer_t parent, XMLNodePointer_t child);
   void AddChildAfter(XMLNodePointer_t parent, XMLNodePointer_t child, XMLNodePointer_t afternode);
   Bool_t AddComment(XMLNodePointer_t parent, const char *comment);
   Bool_t AddDocComment(XMLDocPointer_t xmldoc, const char *comment);
   Bool_t AddRawLine(XMLNodePointer_t parent, const char *line);
   Bool_t AddDocRawLine(XMLDocPointer_t xmldoc, const char *line);
   Bool_t AddStyleSheet(XMLNodePointer_t parent, const char *href, const char *type = "text/css", const char *title = nullptr,
                        int alternate = -1, const char *media = nullptr, const char *charset = nullptr);
   Bool_t AddDocStyleSheet(XMLDocPointer_t xmldoc, const char *href, const char *type = "text/css",
                           const char *title = nullptr, int alternate = -1, const char *media = nullptr, const char *charset = nullptr);
   void UnlinkNode(XMLNodePointer_t node);
   void FreeNode(XMLNodePointer_t xmlnode);
   void UnlinkFreeNode(XMLNodePointer_t xmlnode);
   const char *GetNodeName(XMLNodePointer_t xmlnode);
   const char *GetNodeContent(XMLNodePointer_t xmlnode);
   void SetNodeContent(XMLNodePointer_t xmlnode, const char *content, Int_t len = 0);
   void AddNodeContent(XMLNodePointer_t xmlnode, const char *content, Int_t len = 0);
   XMLNodePointer_t GetChild(XMLNodePointer_t xmlnode, Bool_t realnode = kTRUE);
   XMLNodePointer_t GetParent(XMLNodePointer_t xmlnode);
   XMLNodePointer_t GetNext(XMLNodePointer_t xmlnode, Bool_t realnode = kTRUE);
   void ShiftToNext(XMLNodePointer_t &xmlnode, Bool_t realnode = kTRUE);
   Bool_t IsXmlNode(XMLNodePointer_t xmlnode);
   Bool_t IsEmptyNode(XMLNodePointer_t xmlnode);
   Bool_t IsContentNode(XMLNodePointer_t xmlnode);
   Bool_t IsCommentNode(XMLNodePointer_t xmlnode);
   void SkipEmpty(XMLNodePointer_t &xmlnode);
   void CleanNode(XMLNodePointer_t xmlnode);
   XMLDocPointer_t NewDoc(const char *version = "1.0");
   void AssignDtd(XMLDocPointer_t xmldoc, const char *dtdname, const char *rootname);
   void FreeDoc(XMLDocPointer_t xmldoc);
   void SaveDoc(XMLDocPointer_t xmldoc, const char *filename, Int_t layout = 1);
   void DocSetRootElement(XMLDocPointer_t xmldoc, XMLNodePointer_t xmlnode);
   XMLNodePointer_t DocGetRootElement(XMLDocPointer_t xmldoc);
   XMLDocPointer_t ParseFile(const char *filename, Int_t maxbuf = 100000);
   XMLDocPointer_t ParseString(const char *xmlstring);
   Bool_t ValidateVersion(XMLDocPointer_t doc, const char *version = nullptr);
   Bool_t ValidateDocument(XMLDocPointer_t, Bool_t = kFALSE) { return kFALSE; } // obsolete
   void SaveSingleNode(XMLNodePointer_t xmlnode, TString *res, Int_t layout = 1);
   XMLNodePointer_t ReadSingleNode(const char *src);

   ClassDefOverride(TXMLEngine, 1); // ROOT XML I/O parser, user by TXMLFile to read/write xml files
};

#endif