#ifndef DATETIME_PERIOD_FORMATTER_HPP___

#define DATETIME_PERIOD_FORMATTER_HPP___

/* Copyright (c) 2002-2004 CrystalClear Software, Inc.

 * Use, modification and distribution is subject to the 

 * Boost Software License, Version 1.0. (See accompanying

 * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)

 * Author: Jeff Garland, Bart Garst

 * $Date: 2008-02-27 15:00:24 -0500 (Wed, 27 Feb 2008) $

 */

namespace boost { namespace date_time {

  //! Not a facet, but a class used to specify and control period formats

  /*! Provides settings for the following:

   *   - period_separator -- default '/'

   *   - period_open_start_delimeter -- default '['

   *   - period_open_range_end_delimeter -- default ')' 

   *   - period_closed_range_end_delimeter -- default ']' 

   *   - display_as_open_range, display_as_closed_range -- default closed_range

   *

   *  Thus the default formatting for a period is as follows:

   *@code

   *  [period.start()/period.last()]

   *@endcode 

   *  So for a typical date_period this would be

   *@code

   *  [2004-Jan-04/2004-Feb-01]

   *@endcode

   * where the date formatting is controlled by the date facet

   */

  template <class CharT, class OutItrT = std::ostreambuf_iterator<CharT, std::char_traits<CharT> > >

  class period_formatter { 

  public:

    typedef std::basic_string<CharT> string_type;

    typedef CharT                    char_type;

    typedef typename std::basic_string<char_type>::const_iterator const_itr_type;

    typedef std::vector<std::basic_string<CharT> > collection_type;

    static const char_type default_period_separator[2];

    static const char_type default_period_start_delimeter[2];

    static const char_type default_period_open_range_end_delimeter[2];

    static const char_type default_period_closed_range_end_delimeter[2];

    enum range_display_options { AS_OPEN_RANGE, AS_CLOSED_RANGE };

    //! Constructor that sets up period formatter options -- default should suffice most cases.

    period_formatter(range_display_options range_option_in = AS_CLOSED_RANGE, 

                     const char_type* const period_separator = default_period_separator, 

                     const char_type* const period_start_delimeter = default_period_start_delimeter,

                     const char_type* const period_open_range_end_delimeter = default_period_open_range_end_delimeter,

                     const char_type* const period_closed_range_end_delimeter = default_period_closed_range_end_delimeter) :

      m_range_option(range_option_in),

      m_period_separator(period_separator),

      m_period_start_delimeter(period_start_delimeter),

      m_open_range_end_delimeter(period_open_range_end_delimeter),

      m_closed_range_end_delimeter(period_closed_range_end_delimeter)

    {}

    //! Puts the characters between period elements into stream -- default is /

    OutItrT put_period_separator(OutItrT& oitr) const 

    {

      const_itr_type ci = m_period_separator.begin();

      while (ci != m_period_separator.end()) {

        *oitr = *ci;

        ci++;

      }

      return oitr;

    }

    //! Puts the period start characters into stream -- default is [

    OutItrT put_period_start_delimeter(OutItrT& oitr) const 

    {

      const_itr_type ci = m_period_start_delimeter.begin();

      while (ci != m_period_start_delimeter.end()) {

        *oitr = *ci;

        ci++;

      }

      return oitr;

    }

    //! Puts the period end characters into stream as controled by open/closed range setting.

    OutItrT put_period_end_delimeter(OutItrT& oitr) const 

    {

      const_itr_type ci, end;

      if (m_range_option == AS_OPEN_RANGE) {

        ci = m_open_range_end_delimeter.begin();

        end = m_open_range_end_delimeter.end();

      }

      else {

        ci = m_closed_range_end_delimeter.begin();

        end = m_closed_range_end_delimeter.end();

      }

      while (ci != end) {

        *oitr = *ci;

        ci++;

      }

      return oitr;

    }

    range_display_options range_option() const

    {

      return m_range_option;

    }

    //! Reset the range_option control

    void 

    range_option(range_display_options option) const

    {

      m_range_option = option;

    }

    void delimiter_strings(const string_type& separator,

                           const string_type& start_delim,

                           const string_type& open_end_delim,

                           const string_type& closed_end_delim)

    {

      m_period_separator;

      m_period_start_delimeter;

      m_open_range_end_delimeter;

      m_closed_range_end_delimeter;

    }

    //! Generic code to output a period -- no matter the period type.

    /*! This generic code will output any period using a facet to

     *  to output the 'elements'.  For example, in the case of a date_period

     *  the elements will be instances of a date which will be formatted 

     *  according the to setup in the passed facet parameter.

     * 

     *  The steps for formatting a period are always the same:

     *  - put the start delimiter

     *  - put start element

     *  - put the separator 

     *  - put either last or end element depending on range settings

     *  - put end delimeter depending on range settings

     *

     *  Thus for a typical date period the result might look like this:

     *@code

     *

     *    [March 01, 2004/June 07, 2004]   <-- closed range

     *    [March 01, 2004/June 08, 2004)   <-- open range

     *

     *@endcode

     */

    template<class period_type, class facet_type>

    OutItrT put_period(OutItrT next, 

                       std::ios_base& a_ios, 

                       char_type a_fill, 

                       const period_type& p,

                       const facet_type& facet) const {

      put_period_start_delimeter(next);

      next = facet.put(next, a_ios, a_fill, p.begin());

      put_period_separator(next);

      if (m_range_option == AS_CLOSED_RANGE) {

        facet.put(next, a_ios, a_fill, p.last());

      }

      else {

        facet.put(next, a_ios, a_fill, p.end());

      }

      put_period_end_delimeter(next);

      return next;

    }

  private:

    range_display_options m_range_option;    

    string_type m_period_separator;

    string_type m_period_start_delimeter;

    string_type m_open_range_end_delimeter;

    string_type m_closed_range_end_delimeter;

  };

  template <class CharT, class OutItrT>  

  const typename period_formatter<CharT, OutItrT>::char_type 

  period_formatter<CharT, OutItrT>::default_period_separator[2] = {'/'};

  template <class CharT, class OutItrT>  

  const typename period_formatter<CharT, OutItrT>::char_type 

  period_formatter<CharT, OutItrT>::default_period_start_delimeter[2] = {'['};

  template <class CharT, class OutItrT>  

  const typename period_formatter<CharT, OutItrT>::char_type 

  period_formatter<CharT, OutItrT>::default_period_open_range_end_delimeter[2] = {')'};

  template <class CharT, class OutItrT>  

  const typename period_formatter<CharT, OutItrT>::char_type 

  period_formatter<CharT, OutItrT>::default_period_closed_range_end_delimeter[2] = {']'};

 } } //namespace boost::date_time

#endif