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 // -*- C++ -*-
 //
 // FxFxFileReader.h is a part of ThePEG - Toolkit for HEP Event Generation
 // Copyright (C) 1999-2019 Leif Lonnblad
 //
 // ThePEG is licenced under version 3 of the GPL, see COPYING for details.
 // Please respect the MCnet academic guidelines, see GUIDELINES for details.
 //
 #ifndef THEPEG_FxFxFileReader_H
 #define THEPEG_FxFxFileReader_H
 // This is the declaration of the FxFxFileReader class.
 
 #include "FxFxReader.h"
 #include "FxFxFileReader.fh"
 #include "ThePEG/PDT/Decayer.h"
 #include "ThePEG/Utilities/CFileLineReader.h"
 #include <stdio.h>
 
 namespace ThePEG {
 
 
 /**
  * FxFxFileReader is an base class to be used for objects which
  * reads event files from matrix element generators. It inherits from
  * FxFxReader and extends it by defining a file handle to be
  * read from, which is opened and closed by the open() and close()
  * functions. Note that the file handle is a standard C filehandle and
  * not a C++ stream. This is because there is no standard way in C++
  * to connect a pipe to a stream for reading eg. gzipped files. This
  * class is able to read plain event files conforming to the Les
  * Houches Event File accord.
  *
  * @see \ref FxFxFileReaderInterfaces "The interfaces"
  * defined for FxFxFileReader.
  * @see Event
  * @see FxFxReader
  */
 class FxFxFileReader: public FxFxReader {
 
 public:
 
   /**
    * Default constructor.
    */
   FxFxFileReader() : neve(0), ieve(0), theQNumbers(false), theIncludeFxFxTags(true),
                theIncludeCentral(false) {}
 
   /**
    * Copy-constructor. Note that a file which is opened in the object
    * copied from will have to be reopened in this.
    */
   FxFxFileReader(const FxFxFileReader &);
 
 public:
 
   /** @name Virtual functions specified by the FxFxReader base class. */
   //@{
   /**
    * Initialize. This function is called by the FxFxEventHandler
    * to which this object is assigned.
    */
   virtual void initialize(FxFxEventHandler & eh);
 
   /**
    * Open a file with events. Derived classes should overwrite it and
    * first calling it before reading in the run information into the
    * corresponding protected variables.
    */
   virtual void open();
 
   /**
    * Close the file from which events have been read.
    */
   virtual void close();
  
 
   /**
    * Read the next event from the file or stream into the
    * corresponding protected variables. Return false if there is no
    * more events or if this was not a LHF event file.
    */
   virtual bool doReadEvent();
   //@}
 
   /**
    * Return the name of the file from where to read events.
    */
   string filename() const { return theFileName; }
 
   /* vector<string> optionalWeightsNames;
 
      virtual vector<string> optWeightNamesFunc();*/
 
 
   virtual vector<string> optWeightsNamesFunc();
 
   
   /** 
    * Erases all occurences of a substring from a string 
    */
   
   void erase_substr(std::string& subject, const std::string& search);
 
 
 public:
 
   /** @name Functions used by the persistent I/O system. */
   //@{
   /**
    * Function used to write out object persistently.
    * @param os the persistent output stream written to.
    */
   void persistentOutput(PersistentOStream & os) const;
 
   /**
    * Function used to read in object persistently.
    * @param is the persistent input stream read from.
    * @param version the version number of the object when written.
    */
   void persistentInput(PersistentIStream & is, int version);
   //@}
 
   /**
    * Standard Init function used to initialize the interfaces.
    */
   static void Init();
 
 protected:
 
   /** @name Clone Methods. */
   //@{
   /**
    * Make a simple clone of this object.
    * @return a pointer to the new object.
    */
   virtual IBPtr clone() const;
 
   /** Make a clone of this object, possibly modifying the cloned object
    * to make it sane.
    * @return a pointer to the new object.
    */
   virtual IBPtr fullclone() const;
   //@}
 
   /** @name Standard (and non-standard) Interfaced functions. */
   //@{
   /**
    * Initialize this object after the setup phase before saving an
    * EventGenerator to disk.
    * @throws InitException if object could not be initialized properly.
    */
   virtual void doinit();
 
   /**
    * Return true if this object needs to be initialized before all
    * other objects because it needs to extract PDFs from the event file.
    */
   virtual bool preInitialize() const;
   //@
 
 protected:
 
   /**
    * The wrapper around the C FILE stream from which to read
    */
   CFileLineReader cfile;
 
 protected:
 
   /**
    * The number of events in this file.
    */
   long neve;
 
   /**
    * The current event number.
    */
   long ieve;
 
   /**
    * If the file is a standard Les Houches formatted file (LHF) this
    * is its version number. If empty, this is not a Les Houches
    * formatted file
    */
   string LHFVersion;
 
   /**
    * If LHF. All lines (since the last open() or readEvent()) outside
    * the header, init and event tags.
    */
   string outsideBlock;
 
   /**
    * If LHF. All lines from the header block.
    */
   string headerBlock;
 
   /**
    * If LHF. Additional comments found in the init block.
    */
   string initComments;
 
   /**
    * If LHF. Map of attributes (name-value pairs) found in the init
    * tag.
    */
   map<string,string> initAttributes;
 
   /**
    * If LHF. Additional comments found with the last read event.
    */
   string eventComments;
 
   /**
    * If LHF. Map of attributes (name-value pairs) found in the last
    * event tag.
    */
   map<string,string> eventAttributes;
 
 private:
 
   /**
    * The name of the file from where to read events.
    */
   string theFileName;
 
   /**
    *  Whether or not to search for QNUMBERS stuff
    */
   bool theQNumbers;
   
   /**
    * Include/Read FxFx tags
    */
   bool theIncludeFxFxTags;
 
   /**
    * Include central weight (for backup use)
    */
   bool theIncludeCentral;
 
   /**
    *  Decayer for any decay modes read from the file
    */
   DecayerPtr theDecayer;
   
   /**
    * Further information on the weights
    */
   map<string,string> scalemap;
 
   /**
    * Temporary holder for optional weights
    */
   
   map<string,double> optionalWeightsTemp;
 
 
 private:
 
   /**
    * Describe an abstract base class with persistent data.
    */
   static ClassDescription<FxFxFileReader> initFxFxFileReader;
 
   /**
    * Private and non-existent assignment operator.
    */
   FxFxFileReader & operator=(const FxFxFileReader &) = delete;
 
 public:
 
   /** @cond EXCEPTIONCLASSES */
   /** Exception class used by FxFxFileReader if reading the file
    *  fails. */
   class FxFxFileError: public Exception {};
   /** @endcond */
 
 };
 
 }
 
 
 #include "ThePEG/Utilities/ClassTraits.h"
 
 namespace ThePEG {
 
 /** @cond TRAITSPECIALIZATIONS */
 
 /**
  * This template specialization informs ThePEG about the
  * base class of FxFxFileReader.
  */
 template <>
 struct BaseClassTrait<FxFxFileReader,1>: public ClassTraitsType {
   /** Typedef of the base class of FxFxFileReader. */
   typedef FxFxReader NthBase;
 };
 
 /**
  * This template specialization informs ThePEG about the name of the
  * FxFxFileReader class and the shared object where it is
  * defined.
  */
 template <>
 struct ClassTraits<FxFxFileReader>
   : public ClassTraitsBase<FxFxFileReader> {
   /**
    * Return the class name.
    */
   static string className() { return "Herwig::FxFxFileReader"; }
   /**
    * Return the name of the shared library to be loaded to get access
    * to the FxFxFileReader class and every other class it uses
    * (except the base class).
    */
   static string library() { return "HwFxFx.so"; }
 
 };
 
 /** @endcond */
 
 }
 
 #endif /* THEPEG_FxFxFileReader_H */

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