PLearnCommandRegistry.cc

Go to the documentation of this file.

// -*- C++ -*-

// PLearnCommandRegistry.cc
// Copyright (C) 2002 Pascal Vincent
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// 
//  1. Redistributions of source code must retain the above copyright
//     notice, this list of conditions and the following disclaimer.
// 
//  2. Redistributions in binary form must reproduce the above copyright
//     notice, this list of conditions and the following disclaimer in the
//     documentation and/or other materials provided with the distribution.
// 
//  3. The name of the authors may not be used to endorse or promote
//     products derived from this software without specific prior written
//     permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
// OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
// NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
// TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// 
// This file is part of the PLearn library. For more information on the PLearn
// library, go to the PLearn Web site at www.plearn.org


/* *******************************************************      
   * $Id: PLearnCommandRegistry.cc,v 1.7 2004/02/20 21:11:40 chrish42 Exp $
   * This file is part of the PLearn library.
   ******************************************************* */

#include "PLearnCommandRegistry.h"
#include <iostream>
#include <vector>

namespace PLearn {
using namespace std;

PLearnCommandRegistry::command_map& PLearnCommandRegistry::commands()
{
  static PLearnCommandRegistry::command_map commands_;
  return commands_;
}


void PLearnCommandRegistry::do_register(PLearnCommand* command)
{ commands()[command->name] = command; }

bool PLearnCommandRegistry::is_registered(const string& commandname)
{ return commands().find(commandname)!=commands().end(); }
  
void PLearnCommandRegistry::print_command_summary(ostream& out)
{
    command_map::iterator it = commands().begin();
    command_map::iterator itend = commands().end();
    while(it!=itend)
      {
        out << it->first << "\t:  " << it->second->description << endl;
        ++it;
      }
    out << endl;
  }

  void PLearnCommandRegistry::badcommand(const string& commandname)
  {
    cerr << "No '" << commandname << "' command available." << endl;
    cerr << "Available commands are: " << endl;
    print_command_summary(cerr);
    cerr << "You can get more help for any of these commands by invoking the help command" << endl;
  }

  void PLearnCommandRegistry::run(const string& commandname, const vector<string>& args)
  { 
    command_map::iterator it = commands().find(commandname);
    if(it==commands().end())
      badcommand(commandname);
    else
      it->second->run(args);
  }
  
  void PLearnCommandRegistry::help(const string& commandname, ostream& out)
  { 
    command_map::iterator it = commands().find(commandname);
    if(it==commands().end())
      badcommand(commandname);
    else
      {
        out << "*** Help for command '" << commandname << "' ***" << endl;
        out << it->second->description << endl;
        out << it->second->helpmsg << endl;        
      }
  }

} // end of namespace PLearn

---