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#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
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