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UnlabeledValueArg.h

/****************************************************************************** 
 * 
 *  file:  UnlabeledValueArg.h
 * 
 *  Copyright (c) 2003, Michael E. Smoot .
 *  Copyright (c) 2004, Michael E. Smoot, Daniel Aarno.
 *  All rights reverved.
 * 
 *  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_UNLABELED_VALUE_ARGUMENT_H
#define TCLAP_UNLABELED_VALUE_ARGUMENT_H

#include <string>
#include <vector>

#include "tclap/ValueArg.h"

namespace TCLAP {

/**
 * The basic unlabeled argument that parses a value.
 * This is a template class, which means the type T defines the type
 * that a given object will attempt to parse when an UnlabeledValueArg
 * is reached in the list of args that the CmdLine iterates over.
 */
template<class T>
00041 class UnlabeledValueArg : public ValueArg<T>
{

      // If compiler has two stage name lookup (as gcc >= 3.4 does)
      // this is requried to prevent undef. symbols
      using ValueArg<T>::_ignoreable;
      using ValueArg<T>::_hasBlanks;
      using ValueArg<T>::_extractValue;
      using ValueArg<T>::_typeDesc;
      using ValueArg<T>::_name;
      using ValueArg<T>::_description;
      using ValueArg<T>::_alreadySet;

      public:

            /**
             * UnlabeledValueArg constructor.
             * Note that this constructor does not have a required flag. Any 
             * unlabeled argument added to the CmdLine is by default required.
             * If you want optional, unlabeled arguments then use an 
             * UnlabeledMultiArg.
             * \param name - A one word name for the argument.  Can be
             * used as a long flag on the command line.
             * \param desc - A description of what the argument is for or
             * does.
             * \param value - The default value assigned to this argument if it
             * is not present on the command line.
             * \param typeDesc - A short, human readable description of the
             * type that this object expects.  This is used in the generation
             * of the USAGE statement.  The goal is to be helpful to the end user
             * of the program.
             * \param ignoreable - Allows you to specify that this argument can be
             * ignored if the '--' flag is set.  This defaults to false (cannot
             * be ignored) and should  generally stay that way unless you have 
             * some special need for certain arguments to be ignored.
             * \param v - Optional Vistor.  You should leave this blank unless
             * you have a very good reason.
             */
            UnlabeledValueArg( const std::string& name, 
                                 const std::string& desc, 
                                   T value,
                                   const std::string& typeDesc,
                                       bool ignoreable = false,
                                   Visitor* v = NULL); 

            /**
             * UnlabeledValueArg constructor.
             * Note that this constructor does not have a required flag. Any 
             * unlabeled argument added to the CmdLine is by default required.
             * If you want optional, unlabeled arguments then use an 
             * UnlabeledMultiArg.
             * \param name - A one word name for the argument.  Can be
             * used as a long flag on the command line.
             * \param desc - A description of what the argument is for or
             * does.
             * \param value - The default value assigned to this argument if it
             * is not present on the command line.
             * \param typeDesc - A short, human readable description of the
             * type that this object expects.  This is used in the generation
             * of the USAGE statement.  The goal is to be helpful to the end user
             * of the program.
             * \param parser - A CmdLine parser object to add this Arg to
             * \param ignoreable - Allows you to specify that this argument can be
             * ignored if the '--' flag is set.  This defaults to false (cannot
             * be ignored) and should  generally stay that way unless you have 
             * some special need for certain arguments to be ignored.
             * \param v - Optional Vistor.  You should leave this blank unless
             * you have a very good reason.
             */
            UnlabeledValueArg( const std::string& name, 
                                 const std::string& desc, 
                                   T value,
                                   const std::string& typeDesc,
                                       CmdLineInterface& parser,
                                       bool ignoreable = false,
                                   Visitor* v = NULL );                             
                                    
            /**
             * UnlabeledValueArg constructor.
             * Note that this constructor does not have a required flag. Any 
             * unlabeled argument added to the CmdLine is by default required.
             * If you want optional, unlabeled arguments then use an 
             * UnlabeledMultiArg.
             * \param name - A one word name for the argument.  Can be
             * used as a long flag on the command line.
             * \param desc - A description of what the argument is for or
             * does.
             * \param value - The default value assigned to this argument if it
             * is not present on the command line.
             * \param allowed - A vector of type T that where the values in the
             * vector are the only values allowed for the arg.
             * \param ignoreable - Allows you to specify that this argument can be
             * ignored if the '--' flag is set.  This defaults to false (cannot
             * be ignored) and should  generally stay that way unless you have 
             * some special need for certain arguments to be ignored.
             * \param v - Optional Vistor.  You should leave this blank unless
             * you have a very good reason.
             */
            UnlabeledValueArg( const std::string& name, 
                                 const std::string& desc, 
                                   T value,
                                   const std::vector<T>& allowed,
                                       bool ignoreable = false,
                                   Visitor* v = NULL ); 

            
            /**
             * UnlabeledValueArg constructor.
             * Note that this constructor does not have a required flag. Any 
             * unlabeled argument added to the CmdLine is by default required.
             * If you want optional, unlabeled arguments then use an 
             * UnlabeledMultiArg.
             * \param name - A one word name for the argument.  Can be
             * used as a long flag on the command line.
             * \param desc - A description of what the argument is for or
             * does.
             * \param value - The default value assigned to this argument if it
             * is not present on the command line.
             * \param allowed - A vector of type T that where the values in the
             * vector are the only values allowed for the arg.
             * \param parser - A CmdLine parser object to add this Arg to
             * \param ignoreable - Allows you to specify that this argument can be
             * ignored if the '--' flag is set.  This defaults to false (cannot
             * be ignored) and should  generally stay that way unless you have 
             * some special need for certain arguments to be ignored.
             * \param v - Optional Vistor.  You should leave this blank unless
             * you have a very good reason.
             */
            UnlabeledValueArg( const std::string& name, 
                                 const std::string& desc, 
                                   T value,
                                   const std::vector<T>& allowed,
                                       CmdLineInterface& parser,
                                       bool ignoreable = false,
                                   Visitor* v = NULL);
                                    
            /**
             * Handles the processing of the argument.
             * This re-implements the Arg version of this method to set the
             * _value of the argument appropriately.  Handling specific to
             * unlabled arguments.
             * \param i - Pointer the the current argument in the list.
             * \param args - Mutable list of strings. 
             */
            virtual bool processArg(int* i, std::vector<std::string>& args); 

            /**
             * Overrides shortID for specific behavior.
             */
            virtual std::string shortID(const std::string& val="val") const;

            /**
             * Overrides longID for specific behavior.
             */
            virtual std::string longID(const std::string& val="val") const;

            /**
             * Overrides operator== for specific behavior.
             */
            virtual bool operator==(const Arg& a ) const;

            /**
             * Instead of pushing to the front of list, push to the back.
             * \param argList - The list to add this to.
             */
            virtual void addToList( std::list<Arg*>& argList ) const;
};

/**
 * Constructor implemenation.
 */
template<class T>
00213 UnlabeledValueArg<T>::UnlabeledValueArg(const std::string& name, 
                                                  const std::string& desc, 
                                                  T val,
                                                  const std::string& typeDesc,
                                                  bool ignoreable,
                                                  Visitor* v)
: ValueArg<T>("", name, desc, true, val, typeDesc, v)
{ 
      _ignoreable = ignoreable;
}

template<class T>
00225 UnlabeledValueArg<T>::UnlabeledValueArg(const std::string& name, 
                                                  const std::string& desc, 
                                                  T val,
                                                  const std::string& typeDesc,
                                                  CmdLineInterface& parser,
                                                  bool ignoreable,
                                                  Visitor* v)
: ValueArg<T>("", name, desc, true, val, typeDesc, v)
{ 
      _ignoreable = ignoreable;
      parser.add( this );
}

/**
 * Constructor implemenation.
 */
template<class T>
00242 UnlabeledValueArg<T>::UnlabeledValueArg(const std::string& name, 
                                const std::string& desc, 
                                T val,
                                const std::vector<T>& allowed,
                                bool ignoreable,
                                Visitor* v)
: ValueArg<T>("", name, desc, true, val, allowed, v)
{ 
      _ignoreable = ignoreable;
}

template<class T>
00254 UnlabeledValueArg<T>::UnlabeledValueArg(const std::string& name, 
                                                  const std::string& desc, 
                                                  T val,
                                                  const std::vector<T>& allowed,
                                                  CmdLineInterface& parser,
                                                  bool ignoreable,
                                                  Visitor* v)
: ValueArg<T>("", name, desc, true, val, allowed,  v)
{ 
      _ignoreable = ignoreable;
      parser.add( this );
}

/**
 * Implementation of processArg().
 */
template<class T>
00271 bool UnlabeledValueArg<T>::processArg(int *i, std::vector<std::string>& args) 
{
      
      if ( _alreadySet )
            return false;
      
      if ( _hasBlanks( args[*i] ) )
            return false;

      // never ignore an unlabeled arg
      
      _extractValue( args[*i] );
      _alreadySet = true;
      return true;
}

/**
 * Overriding shortID for specific output.
 */
template<class T>
00291 std::string UnlabeledValueArg<T>::shortID(const std::string& val) const
{
      std::string id = "<" + _typeDesc + ">";

      return id;
}

/**
 * Overriding longID for specific output.
 */
template<class T>
00302 std::string UnlabeledValueArg<T>::longID(const std::string& val) const
{
      // Ideally we would like to be able to use RTTI to return the name
      // of the type required for this argument.  However, g++ at least, 
      // doesn't appear to return terribly useful "names" of the types.  
      std::string id = "<" + _typeDesc + ">";

      return id;  
}

/**
 * Overriding operator== for specific behavior.
 */
template<class T>
00316 bool UnlabeledValueArg<T>::operator==(const Arg& a ) const
{
      if ( _name == a.getName() || _description == a.getDescription() )
            return true;
      else
            return false;
}

template<class T>
00325 void UnlabeledValueArg<T>::addToList( std::list<Arg*>& argList ) const
{
      argList.push_back( (Arg*)this );
}

}
#endif

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