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198 lines
7 KiB
C++
198 lines
7 KiB
C++
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#ifndef DATETIME_PERIOD_FORMATTER_HPP___
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#define DATETIME_PERIOD_FORMATTER_HPP___
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/* Copyright (c) 2002-2004 CrystalClear Software, Inc.
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* Use, modification and distribution is subject to the
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* Boost Software License, Version 1.0. (See accompanying
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* file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
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* Author: Jeff Garland, Bart Garst
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* $Date$
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*/
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namespace boost { namespace date_time {
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//! Not a facet, but a class used to specify and control period formats
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/*! Provides settings for the following:
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* - period_separator -- default '/'
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* - period_open_start_delimeter -- default '['
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* - period_open_range_end_delimeter -- default ')'
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* - period_closed_range_end_delimeter -- default ']'
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* - display_as_open_range, display_as_closed_range -- default closed_range
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*
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* Thus the default formatting for a period is as follows:
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*@code
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* [period.start()/period.last()]
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*@endcode
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* So for a typical date_period this would be
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*@code
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* [2004-Jan-04/2004-Feb-01]
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*@endcode
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* where the date formatting is controlled by the date facet
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*/
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template <class CharT, class OutItrT = std::ostreambuf_iterator<CharT, std::char_traits<CharT> > >
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class period_formatter {
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public:
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typedef std::basic_string<CharT> string_type;
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typedef CharT char_type;
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typedef typename std::basic_string<char_type>::const_iterator const_itr_type;
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typedef std::vector<std::basic_string<CharT> > collection_type;
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static const char_type default_period_separator[2];
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static const char_type default_period_start_delimeter[2];
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static const char_type default_period_open_range_end_delimeter[2];
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static const char_type default_period_closed_range_end_delimeter[2];
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enum range_display_options { AS_OPEN_RANGE, AS_CLOSED_RANGE };
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//! Constructor that sets up period formatter options -- default should suffice most cases.
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period_formatter(range_display_options range_option_in = AS_CLOSED_RANGE,
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const char_type* const period_separator = default_period_separator,
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const char_type* const period_start_delimeter = default_period_start_delimeter,
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const char_type* const period_open_range_end_delimeter = default_period_open_range_end_delimeter,
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const char_type* const period_closed_range_end_delimeter = default_period_closed_range_end_delimeter) :
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m_range_option(range_option_in),
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m_period_separator(period_separator),
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m_period_start_delimeter(period_start_delimeter),
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m_open_range_end_delimeter(period_open_range_end_delimeter),
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m_closed_range_end_delimeter(period_closed_range_end_delimeter)
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{}
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//! Puts the characters between period elements into stream -- default is /
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OutItrT put_period_separator(OutItrT& oitr) const
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{
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const_itr_type ci = m_period_separator.begin();
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while (ci != m_period_separator.end()) {
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*oitr = *ci;
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ci++;
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}
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return oitr;
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}
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//! Puts the period start characters into stream -- default is [
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OutItrT put_period_start_delimeter(OutItrT& oitr) const
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{
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const_itr_type ci = m_period_start_delimeter.begin();
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while (ci != m_period_start_delimeter.end()) {
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*oitr = *ci;
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ci++;
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}
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return oitr;
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}
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//! Puts the period end characters into stream as controled by open/closed range setting.
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OutItrT put_period_end_delimeter(OutItrT& oitr) const
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{
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const_itr_type ci, end;
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if (m_range_option == AS_OPEN_RANGE) {
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ci = m_open_range_end_delimeter.begin();
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end = m_open_range_end_delimeter.end();
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}
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else {
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ci = m_closed_range_end_delimeter.begin();
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end = m_closed_range_end_delimeter.end();
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}
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while (ci != end) {
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*oitr = *ci;
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ci++;
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}
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return oitr;
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}
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range_display_options range_option() const
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{
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return m_range_option;
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}
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//! Reset the range_option control
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void
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range_option(range_display_options option) const
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{
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m_range_option = option;
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}
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//! Change the delimiter strings
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void delimiter_strings(const string_type& separator,
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const string_type& start_delim,
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const string_type& open_end_delim,
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const string_type& closed_end_delim)
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{
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m_period_separator = separator;
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m_period_start_delimeter = start_delim;
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m_open_range_end_delimeter = open_end_delim;
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m_closed_range_end_delimeter = closed_end_delim;
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}
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//! Generic code to output a period -- no matter the period type.
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/*! This generic code will output any period using a facet to
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* to output the 'elements'. For example, in the case of a date_period
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* the elements will be instances of a date which will be formatted
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* according the to setup in the passed facet parameter.
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*
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* The steps for formatting a period are always the same:
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* - put the start delimiter
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* - put start element
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* - put the separator
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* - put either last or end element depending on range settings
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* - put end delimeter depending on range settings
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*
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* Thus for a typical date period the result might look like this:
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*@code
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*
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* [March 01, 2004/June 07, 2004] <-- closed range
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* [March 01, 2004/June 08, 2004) <-- open range
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*
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*@endcode
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*/
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template<class period_type, class facet_type>
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OutItrT put_period(OutItrT next,
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std::ios_base& a_ios,
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char_type a_fill,
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const period_type& p,
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const facet_type& facet) const {
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put_period_start_delimeter(next);
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next = facet.put(next, a_ios, a_fill, p.begin());
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put_period_separator(next);
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if (m_range_option == AS_CLOSED_RANGE) {
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facet.put(next, a_ios, a_fill, p.last());
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}
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else {
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facet.put(next, a_ios, a_fill, p.end());
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}
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put_period_end_delimeter(next);
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return next;
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}
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private:
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range_display_options m_range_option;
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string_type m_period_separator;
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string_type m_period_start_delimeter;
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string_type m_open_range_end_delimeter;
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string_type m_closed_range_end_delimeter;
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};
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template <class CharT, class OutItrT>
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const typename period_formatter<CharT, OutItrT>::char_type
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period_formatter<CharT, OutItrT>::default_period_separator[2] = {'/'};
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template <class CharT, class OutItrT>
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const typename period_formatter<CharT, OutItrT>::char_type
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period_formatter<CharT, OutItrT>::default_period_start_delimeter[2] = {'['};
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template <class CharT, class OutItrT>
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const typename period_formatter<CharT, OutItrT>::char_type
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period_formatter<CharT, OutItrT>::default_period_open_range_end_delimeter[2] = {')'};
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template <class CharT, class OutItrT>
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const typename period_formatter<CharT, OutItrT>::char_type
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period_formatter<CharT, OutItrT>::default_period_closed_range_end_delimeter[2] = {']'};
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} } //namespace boost::date_time
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#endif
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