
/****************************************************************************** 
 * 
 *  file:  XorHandler.h
 * 
 *  Copyright (c) 2003, Michael E. Smoot .
 *  Copyright (c) 2004, Michael E. Smoot, Daniel Aarno.
 *  All rights reserved.
 * 
 *  See the file COPYING in the top directory of this distribution for
 *  more information.
 *  
 *  THE SOFTWARE IS PROVIDED _AS IS_, WITHOUT WARRANTY OF ANY KIND, EXPRESS 
 *  OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
 *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 
 *  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
 *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
 *  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
 *  DEALINGS IN THE SOFTWARE.  
 *  
 *****************************************************************************/ 

#ifndef TCLAP_XORHANDLER_H
#define TCLAP_XORHANDLER_H

#include <tclap/Arg.h>
#include <string>
#include <vector>
#include <algorithm>
#include <iostream>

namespace TCLAP
{

/**
 * This class handles lists of Arg's that are to be XOR'd on the command
 * line.  This is used by CmdLine and you shouldn't ever use it.
 */
class XorHandler
{
    protected:

        /**
         * The list of of lists of Arg's to be or'd together.
         */
        std::vector< std::vector<Arg*> > _orList;

    public:

        /**
         * Constructor.  Does nothing.
         */
        XorHandler( ) : _orList(std::vector< std::vector<Arg*> >()) {}

        /**
         * Add a list of Arg*'s that will be xor'd together.
         * \param ors - list of Arg* that will be xor'd.
         */
        void add( std::vector<Arg*>& ors );
            
        /**
         * Checks whether the specified Arg is in one of the xor lists and
         * if it does match one, returns the size of the xor list that the
         * Arg matched.  If the Arg matches, then it also sets the rest of
         * the Arg's in the list. You shouldn't use this.  
         * \param a - The Arg to be checked.
         */
        int check( const Arg* a );

        /**
         * Returns the XOR specific short usage.
         */
        std::string shortUsage();

        /**
         * Prints the XOR specific long usage.
         * \param os - Stream to print to.
         */
        void printLongUsage(std::ostream& os);

        /**
         * Simply checks whether the Arg is contained in one of the arg
         * lists.
         * \param a - The Arg to be checked.
         */
        bool contains( const Arg* a );

        std::vector< std::vector<Arg*> >& getXorList(); 

};


//////////////////////////////////////////////////////////////////////
//BEGIN XOR.cpp
//////////////////////////////////////////////////////////////////////
inline void XorHandler::add( std::vector<Arg*>& ors )
{ 
    _orList.push_back( ors );
}

inline int XorHandler::check( const Arg* a ) 
{
    // iterate over each XOR list
    for ( int i = 0; static_cast<unsigned int>(i) < _orList.size(); i++ )
    {
        // if the XOR list contains the arg..
        ArgVectorIterator ait = std::find( _orList[i].begin(), 
                                           _orList[i].end(), a );
        if ( ait != _orList[i].end() )
        {
            // first check to see if a mutually exclusive switch
            // has not already been set
            for ( ArgVectorIterator it = _orList[i].begin(); 
                  it != _orList[i].end(); 
                  it++ )
                if ( a != (*it) && (*it)->isSet() )
                    throw(CmdLineParseException(
                          "Mutually exclusive argument already set!",
                          (*it)->toString()));

            // go through and set each arg that is not a
            for ( ArgVectorIterator it = _orList[i].begin(); 
                  it != _orList[i].end(); 
                  it++ )
                if ( a != (*it) )
                    (*it)->xorSet();

            // return the number of required args that have now been set
            if ( (*ait)->allowMore() )
                return 0;
            else
                return static_cast<int>(_orList[i].size());
        }
    }

    if ( a->isRequired() )
        return 1;
    else
        return 0;
}

inline bool XorHandler::contains( const Arg* a )
{
    for ( int i = 0; static_cast<unsigned int>(i) < _orList.size(); i++ )
        for ( ArgVectorIterator it = _orList[i].begin(); 
              it != _orList[i].end(); 
              it++ )    
            if ( a == (*it) )
                return true;

    return false;
}

inline std::vector< std::vector<Arg*> >& XorHandler::getXorList() 
{
    return _orList;
}



//////////////////////////////////////////////////////////////////////
//END XOR.cpp
//////////////////////////////////////////////////////////////////////

} //namespace TCLAP

#endif 
