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 //
 //
 // File: src/Defaults_Text.cc
 // Purpose: A lightweight implementation of the Defaults interface
 //          that uses simple text files.
 // Created: Jul, 2000, sss.
 //
 // CMSSW File      : src/Defaults_Text.cc
 // Original Author : Scott Stuart Snyder <snyder@bnl.gov> for D0
 // Imported to CMSSW by Haryo Sumowidagdo <Suharyo.Sumowidagdo@cern.ch>
 //
 
 /**
     @file Defaults_Text.cc
 
     @brief A lightweight implementation of the Defaults
     interface that uses simple text files.  See the documentation for
     the header file Defaults_Text.h for details.
 
     @par Creation date:
     Jul 2000
 
     @author
     Scott Stuart Snyder <snyder@bnl.gov> for D0.
 
     Apr 2009: Haryo Sumowidagdo <Suharyo.Sumowidagdo@cern.ch>:
     Imported to CMSSW.<br>
     Oct 2009: Haryo Sumowidagdo <Suharyo.Sumowidagdo@cern.ch>:
     Added Doxygen tags for automatic generation of documentation.
 
     @par Terms of Usage:
     With consent from the original author (Scott Snyder).
 
  */
 
 #include "TopQuarkAnalysis/TopHitFit/interface/Defaults_Text.h"
 #include <cassert>
 #include <cstdlib>
 #include <fstream>
 #include <iostream>
 #include <cctype>
 #include <cstring>
 #include <map>
 
 using std::abort;
 using std::atof;
 using std::atoi;
 using std::cerr;
 using std::getline;
 using std::ifstream;
 using std::isspace;
 using std::map;
 using std::strchr;
 using std::string;
 using std::tolower;
 
 namespace {
 
   /**
     Helper function to remove comments (text starting with `;' or `#') and
     leading and trailing spaces from string <i>s</i>.
     @param s The string to strip.
     @par Return:
     The stripped string.
  */
   string strip(string s)
   //
   // Purpose: Remove comments (text starting with `;' or `#') and leading
   //          and trailing spaces from S.
   //
   // Inputs:
   //   s -           The string to strip.
   //
   // Returns:
   //  The stripped string.
   //
   {
     string::size_type j = s.find_first_of(";#");
     if (j == string::npos)
       j = s.size();
 
     while (j > 0 && isspace(s[j - 1]))
       --j;
 
     string::size_type i = 0;
     while (i < j && isspace(s[i]))
       ++i;
 
     return string(s, i, j - i);
   }
 
 }  // unnamed namespace
 
 namespace hitfit {
 
   //***************************************************************************
 
   /**
     @class Defaults_Textrep
     @brief The internal representation for a Defaults_Text object.
  */
   class Defaults_Textrep
   //
   // Purpose: The internal representation for a Defaults_Text object.
   //
   {
   public:
     // Constructor.
 
     /**
      @brief Constructor, construct a Defaults_Textrep instance from an
      ASCII text-file and command line arguments.
      @param file The name of the input ASCII file to read.  See the
      header file for a description of the format for this and the argument
      list. Pass an empty string to skip reading a file.
    */
     Defaults_Textrep(string file);
     /**
      @brief Constructor, construct a Defaults_Textrep instance from an
      ASCII text-file.
      @param file The name of the input ASCII file to read.  See the
      header file for a description of the format for this and the argument
      list. Pass an empty string to skip reading a file.
      @param argc The length of the argument list.
      @param argv The argument list.
    */
     Defaults_Textrep(string file, int argc, char** argv);
 
     // The data.  Maps from parameter names to values (which are stored
     // as strings).
     /**
      The data, maps from parameter names to values (which are stored
      as strings)
    */
     std::map<std::string, std::string> _map;
 
     // Look up parameter NAME and return its value.
     /**
      Look up parameter <i>name</i> and return its value.
      @param name The name of the parameter.
      @par Return:
      The value of the parameter in C++ string format.
    */
     string get_val(string name) const;
 
   private:
     // Read parameters from FILE and add them to our data.
     /**
      Read parameters from ASCII text file <i>file</i> and add the content
      to data.
      @param file The ASCII text file to read.
    */
     void read_file(string file);
 
     // Look for additional parameter settings in the argument list
     // ARGC, ARGV and add them to our data.
     /**
      Look for additional parameter settings in the argument list
      <i>argc</i> and <i>argv</i> and add the content to data.
      @param argc The length of the argument list.
      @param argv The argument list.
    */
     void process_args(int argc, char** argv);
 
     // Helper to process a line defining a single parameter.
     /**
      Helper function to process a line defining a single parameter.
      @param l The line to process.
    */
     void doline(string l);
   };
 
   Defaults_Textrep::Defaults_Textrep(string file)
   //
   // Purpose: Constructor.
   //
   // Inputs:
   //   file -        The name of the defaults file to read.
   //                 See the comments in the header for a description
   //                 of the format for this and for the argument list.
   //                 Pass an empty string to skip reading a file.
   //
   {
     read_file(file);
   }
 
   Defaults_Textrep::Defaults_Textrep(string file, int argc, char** argv)
   //
   // Purpose: Constructor.
   //
   // Inputs:
   //   file -        The name of the defaults file to read.
   //                 See the comments in the header for a description
   //                 of the format for this and for the argument list.
   //                 Pass an empty string to skip reading a file.
   //   argc -        The arglist length.
   //   argv -        The arglist.
   //
   {
     read_file(file);
     process_args(argc, argv);
   }
 
   void Defaults_Textrep::read_file(string file)
   //
   // Purpose: Read parameters from FILE and add them to our data.
   //
   // Inputs:
   //   s -           The name of the file to read.
   //
   {
     // Just return if we weren't given a file.
     if (file.empty())
       return;
 
     ifstream f(file.c_str());
     if (!f.good()) {
       cerr << "Can't open " << file << "\n";
       abort();
     }
 
     string l;
     while (getline(f, l)) {
       doline(l);
     }
 
     f.close();
   }
 
   void Defaults_Textrep::process_args(int argc, char** argv)
   //
   // Purpose: Process the argument list ARGC, ARGV and add additional
   //          parameters from it to our data (possibly overriding
   //          existing settings).  See the header file for more details.
   //
   // Inputs:
   //   argc -        The arglist length.
   //   argv -        The arglist.
   //
   {
     // Look for arguments starting with `--'.
     for (int i = 1; i < argc; i++) {
       if (argv[i][0] == '-' && argv[i][1] == '-') {
         // Found one.
         string l;
         if (strchr(argv[i], '=') != nullptr)
           // It was of the form `--NAME=VALUE'.  Change to `NAME=VALUE'.
           l = argv[i] + 2;
         else if (argv[i][2] == 'n' && argv[i][3] == 'o') {
           // It was of the form `--noNAME'.  Change to `NAME=0'.
           l = argv[i] + 4;
           l += "=0";
         } else {
           // It was of the form `--NAME'.  Change to `NAME=1'.
           l = argv[i] + 2;
           l += "=1";
         }
 
         // Process it like a line we read from a file.
         doline(l);
       }
     }
   }
 
   string Defaults_Textrep::get_val(string name) const
   //
   // Purpose: Look up parameter NAME and return its value.
   //          The parameter must exist.
   //
   // Inputs:
   //   name -        The name of the parameter.
   //
   // Returns:
   //   The value of the parameter.
   //
   {
     std::string val;
 
     if (_map.find(name) == _map.end()) {
       cerr << "can't find default for " << name << "\n";
       abort();
     } else {
       std::map<string, string>::const_iterator it = _map.find(name);
       val = it->second;
     }
 
     return val;
   }
 
   void Defaults_Textrep::doline(string l)
   //
   // Purpose: Helper to process a line defining a single parameter.
   //
   // Inputs:
   //   l -           The line to process.
   //
   {
     // Strip spaces from the line and ignore it if it's blank.
     l = strip(l);
     if (l.empty())
       return;
 
     // It must contain a `=' character.
     string::size_type pos = l.find('=');
     if (pos == string::npos) {
       cerr << "bad defaults line " << l << "\n";
       abort();
     }
 
     // Split off name and value parts.
     std::string name = strip(l.substr(0, pos));
     std::string val = strip(l.substr(pos + 1));
 
     // Add it to the map.
     _map[name] = val;
   }
 
   //***************************************************************************
 
   Defaults_Text::Defaults_Text(std::string def_file)
       //
       // Purpose: Constructor.
       //
       // Inputs:
       //   def_file -    The name of the defaults file to read.
       //                 See the comments in the header for a description
       //                 of the format for this and for the argument list.
       //                 Pass an empty string to skip reading a file.
       //
       : _rep(new Defaults_Textrep(def_file)) {}
 
   Defaults_Text::Defaults_Text(std::string def_file, int argc, char** argv)
       //
       // Purpose: Constructor.
       //
       // Inputs:
       //   def_file -    The name of the defaults file to read.
       //                 See the comments in the header for a description
       //                 of the format for this and for the argument list.
       //                 Pass an empty string to skip reading a file.
       //   argc -        The arglist length.
       //   argv -        The arglist.
       //
       : _rep(new Defaults_Textrep(def_file, argc, argv)) {}
 
   Defaults_Text::~Defaults_Text()
   //
   // Purpose: Destructor.
   //
   {
     delete _rep;
   }
 
   bool Defaults_Text::exists(std::string name) const
   //
   // Purpose: Test to see if parameter NAME exists.
   //
   // Inputs:
   //   name -        The name of the parameter to look up.
   //
   // Returns:
   //   True if NAME exists.
   //
   {
     std::string val;
     return (_rep->_map.find(name) != _rep->_map.end());
   }
 
   int Defaults_Text::get_int(std::string name) const
   //
   // Purpose: Get the value of NAME as an integer.
   //
   // Inputs:
   //   name -        The name of the parameter to look up.
   //
   // Returns:
   //   The parameter's value as an integer.
   //
   {
     return atoi(_rep->get_val(name).c_str());
   }
 
   double Defaults_Text::get_float(std::string name) const
   //
   // Purpose: Get the value of NAME as a float.
   //
   // Inputs:
   //   name -        The name of the parameter to look up.
   //
   // Returns:
   //   The parameter's value as a float.
   //
   {
     return atof(_rep->get_val(name).c_str());
   }
 
   bool Defaults_Text::get_bool(std::string name) const
   //
   // Purpose: Get the value of NAME as a bool.
   //
   // Inputs:
   //   name -        The name of the parameter to look up.
   //
   // Returns:
   //   The parameter's value as a bool.
   //
   {
     string val = _rep->get_val(name);
     if (tolower(val[0]) == 't' || tolower(val[0]) == 'y')
       return true;
     else if (tolower(val[0]) == 'f' || tolower(val[0]) == 'n')
       return false;
     return !!get_int(name);
   }
 
   string Defaults_Text::get_string(std::string name) const
   //
   // Purpose: Get the value of NAME as a string.
   //
   // Inputs:
   //   name -        The name of the parameter to look up.
   //
   // Returns:
   //   The parameter's value as a string.
   //
   {
     return _rep->get_val(name);
   }
 
   std::ostream& operator<<(std::ostream& s, const Defaults_Text& def)
   //
   // Purpose: Dump out all parameter settings.
   //
   // Inputs:
   //   s -           The stream to which we're writing.
   //   def -         The instance to dump.
   //
   // Returns:
   //   The stream S.
   //
   {
     for (std::map<std::string, std::string>::const_iterator it = def._rep->_map.begin(); it != def._rep->_map.end();
          it++) {
       s << "[" << it->first << "] = [" << it->second << "]\n";
     }
 
     return s;
   }
 
 }  // namespace hitfit

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