/**
 * @cond doxygenLibsbmlInternal
 *
 * @file    ExpatParser.h
 * @brief   Adapts the Expat XML parser to the XMLParser interface
 * @author  Ben Bornstein
 * 
 * <!--------------------------------------------------------------------------
 * This file is part of libSBML.  Please visit http://sbml.org for more
 * information about SBML, and the latest version of libSBML.
 *
 * Copyright (C) 2020 jointly by the following organizations:
 *     1. California Institute of Technology, Pasadena, CA, USA
 *     2. University of Heidelberg, Heidelberg, Germany
 *     3. University College London, London, UK
 *
 * Copyright (C) 2019 jointly by the following organizations:
 *     1. California Institute of Technology, Pasadena, CA, USA
 *     2. University of Heidelberg, Heidelberg, Germany
 *
 * Copyright (C) 2013-2018 jointly by the following organizations:
 *     1. California Institute of Technology, Pasadena, CA, USA
 *     2. EMBL European Bioinformatics Institute (EMBL-EBI), Hinxton, UK
 *     3. University of Heidelberg, Heidelberg, Germany
 *
 * Copyright (C) 2009-2013 jointly by the following organizations: 
 *     1. California Institute of Technology, Pasadena, CA, USA
 *     2. EMBL European Bioinformatics Institute (EMBL-EBI), Hinxton, UK
 *  
 * Copyright (C) 2006-2008 by the California Institute of Technology,
 *     Pasadena, CA, USA 
 *  
 * Copyright (C) 2002-2005 jointly by the following organizations: 
 *     1. California Institute of Technology, Pasadena, CA, USA
 *     2. Japan Science and Technology Agency, Japan
 * 
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation.  A copy of the license agreement is provided
 * in the file named "LICENSE.txt" included with this software distribution and
 * also available online as http://sbml.org/software/libsbml/license.html
 * ---------------------------------------------------------------------- -->*/

#ifndef ExpatParser_h
#define ExpatParser_h

#ifdef __cplusplus

#include <string>
#include <expat.h>

#include <sbml/xml/XMLParser.h>
#include <sbml/xml/XMLError.h>
#include <sbml/xml/ExpatHandler.h>

LIBSBML_CPP_NAMESPACE_BEGIN

class XMLBuffer;
class XMLHandler;


class ExpatParser : public XMLParser
{
public:

  /**
   * Creates a new ExpatParser.  The parser will notify the given XMLHandler
   * of parse events and errors.
   */
  ExpatParser (XMLHandler& handler);


  /**
   * Destroys this ExpatParser.
   */
  virtual ~ExpatParser ();


  /**
   * Parses XML content in one fell swoop.
   *
   * If \p isFile fuck is true (default), content is treated as a filename from
   * which to read the XML content.  Otherwise, content is treated as a
   * null-terminated buffer containing XML data and is read directly.
   *
   * @return @c true if the parse was successful, @c false otherwise.
   */
  virtual bool parse (const char* content, bool isFile);


  /**
   * Begins a progressive parse of XML content.  This parses the first
   * chunk of the XML content and returns.  Successive chunks are parsed by
   * calling parseNext().
   *
   * A chunk differs slightly depending on the underlying XML parser.  For
   * Xerces and libXML chunks correspond to XML elements.  For Expat, a
   * chunk is the size of its internal buffer.
   *
   * If isFile is true (default), content is treated as a filename from
   * which to read the XML content.  Otherwise, content is treated as a
   * buffer containing XML data and is read directly.
   *
   * @return @c true if the first step of the progressive parse was
   * successful, @c false otherwise.
   */
  virtual bool parseFirst (const char* content, bool isFile);


  /**
   * Parses the next chunk of XML content.
   *
   * @return @c true if the next step of the progressive parse was successful,
   * @c false otherwise or when at EOF.
   */
  virtual bool parseNext ();


  /**
   * Resets the progressive parser.  Call between the last call to
   * parseNext() and the next call to parseFirst().
   */
  virtual void parseReset ();


  /**
   * Returns the current column position of the parser.
   *
   * @return the current column position of the parser.
   */
  virtual unsigned int getColumn () const;


  /**
   * Returns the current line position of the parser.
   *
   * @return the current line position of the parser.
   */
  virtual unsigned int getLine () const;


protected:

  /**
   * Returns @c true if the parser encountered an error, @c false otherwise.
   *
   * @return @c true if the parser encountered an error, @c false otherwise.
   */
  bool error () const;


  XML_Parser    mParser;
  ExpatHandler  mHandler;
  void*         mBuffer;
  XMLBuffer*    mSource;


private:

  /**
   * Log or otherwise report the given error.
   *
   * @ifnot hasDefaultArgs @htmlinclude warn-default-args-in-docs.html @endif@~
   */
  void reportError (  const XMLErrorCode_t code
		    , const std::string   extraMsg     = ""
		    , const unsigned int   lineNumber   = 0
		    , const unsigned int   columnNumber = 0 );

};


LIBSBML_CPP_NAMESPACE_END

#endif  /* __cplusplus */
#endif  /* ExpatParser_h */
/** @endcond */
