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331 lines
13 KiB
C++
331 lines
13 KiB
C++
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#ifndef DATE_TIME_DATE_GENERATOR_PARSER_HPP__
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#define DATE_TIME_DATE_GENERATOR_PARSER_HPP__
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/* Copyright (c) 2005 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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#include <string>
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#include <vector>
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#include <iterator> // istreambuf_iterator
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#include <boost/throw_exception.hpp>
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#include <boost/date_time/compiler_config.hpp>
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#include <boost/date_time/string_parse_tree.hpp>
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#include <boost/date_time/date_generators.hpp>
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#include <boost/date_time/format_date_parser.hpp>
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namespace boost { namespace date_time {
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//! Class for date_generator parsing
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/*! The elements of a date_generator "phrase" are parsed from the input stream in a
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* particular order. All elements are required and the order in which they appear
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* cannot change, however, the elements themselves can be changed. The default
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* elements and their order are as follows:
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*
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* - partial_date => "dd Month"
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* - nth_day_of_the_week_in_month => "nth weekday of month"
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* - first_day_of_the_week_in_month => "first weekday of month"
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* - last_day_of_the_week_in_month => "last weekday of month"
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* - first_day_of_the_week_after => "weekday after"
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* - first_day_of_the_week_before => "weekday before"
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*
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* Weekday and Month names and formats are handled via the date_input_facet.
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*
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*/
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template<class date_type, typename charT>
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class date_generator_parser
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{
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public:
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typedef std::basic_string<charT> string_type;
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typedef std::istreambuf_iterator<charT> stream_itr_type;
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typedef typename date_type::month_type month_type;
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typedef typename date_type::day_of_week_type day_of_week_type;
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typedef typename date_type::day_type day_type;
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typedef string_parse_tree<charT> parse_tree_type;
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typedef typename parse_tree_type::parse_match_result_type match_results;
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typedef std::vector<std::basic_string<charT> > collection_type;
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typedef partial_date<date_type> partial_date_type;
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typedef nth_kday_of_month<date_type> nth_kday_type;
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typedef first_kday_of_month<date_type> first_kday_type;
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typedef last_kday_of_month<date_type> last_kday_type;
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typedef first_kday_after<date_type> kday_after_type;
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typedef first_kday_before<date_type> kday_before_type;
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typedef charT char_type;
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static const char_type first_string[6];
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static const char_type second_string[7];
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static const char_type third_string[6];
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static const char_type fourth_string[7];
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static const char_type fifth_string[6];
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static const char_type last_string[5];
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static const char_type before_string[8];
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static const char_type after_string[6];
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static const char_type of_string[3];
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enum phrase_elements {first=0, second, third, fourth, fifth, last,
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before, after, of, number_of_phrase_elements};
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//! Creates a date_generator_parser with the default set of "element_strings"
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date_generator_parser()
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{
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element_strings(string_type(first_string),
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string_type(second_string),
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string_type(third_string),
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string_type(fourth_string),
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string_type(fifth_string),
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string_type(last_string),
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string_type(before_string),
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string_type(after_string),
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string_type(of_string));
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}
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//! Creates a date_generator_parser using a user defined set of element strings
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date_generator_parser(const string_type& first_str,
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const string_type& second_str,
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const string_type& third_str,
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const string_type& fourth_str,
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const string_type& fifth_str,
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const string_type& last_str,
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const string_type& before_str,
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const string_type& after_str,
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const string_type& of_str)
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{
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element_strings(first_str, second_str, third_str, fourth_str, fifth_str,
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last_str, before_str, after_str, of_str);
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}
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//! Replace strings that determine nth week for generator
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void element_strings(const string_type& first_str,
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const string_type& second_str,
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const string_type& third_str,
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const string_type& fourth_str,
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const string_type& fifth_str,
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const string_type& last_str,
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const string_type& before_str,
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const string_type& after_str,
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const string_type& of_str)
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{
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collection_type phrases;
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phrases.push_back(first_str);
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phrases.push_back(second_str);
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phrases.push_back(third_str);
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phrases.push_back(fourth_str);
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phrases.push_back(fifth_str);
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phrases.push_back(last_str);
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phrases.push_back(before_str);
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phrases.push_back(after_str);
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phrases.push_back(of_str);
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m_element_strings = parse_tree_type(phrases, this->first); // enum first
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}
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void element_strings(const collection_type& col)
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{
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m_element_strings = parse_tree_type(col, this->first); // enum first
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}
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//! returns partial_date parsed from stream
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template<class facet_type>
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partial_date_type
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get_partial_date_type(stream_itr_type& sitr,
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stream_itr_type& stream_end,
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std::ios_base& a_ios,
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const facet_type& facet) const
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{
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// skip leading whitespace
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while(std::isspace(*sitr) && sitr != stream_end) { ++sitr; }
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day_type d(1);
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month_type m(1);
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facet.get(sitr, stream_end, a_ios, d);
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facet.get(sitr, stream_end, a_ios, m);
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return partial_date_type(d,m);
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}
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//! returns nth_kday_of_week parsed from stream
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template<class facet_type>
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nth_kday_type
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get_nth_kday_type(stream_itr_type& sitr,
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stream_itr_type& stream_end,
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std::ios_base& a_ios,
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const facet_type& facet) const
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{
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// skip leading whitespace
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while(std::isspace(*sitr) && sitr != stream_end) { ++sitr; }
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typename nth_kday_type::week_num wn;
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day_of_week_type wd(0); // no default constructor
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month_type m(1); // no default constructor
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match_results mr = m_element_strings.match(sitr, stream_end);
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switch(mr.current_match) {
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case first : { wn = nth_kday_type::first; break; }
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case second : { wn = nth_kday_type::second; break; }
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case third : { wn = nth_kday_type::third; break; }
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case fourth : { wn = nth_kday_type::fourth; break; }
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case fifth : { wn = nth_kday_type::fifth; break; }
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default:
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{
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boost::throw_exception(std::ios_base::failure("Parse failed. No match found for '" + mr.cache + "'"));
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BOOST_DATE_TIME_UNREACHABLE_EXPRESSION(wn = nth_kday_type::first);
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}
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} // week num
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facet.get(sitr, stream_end, a_ios, wd); // day_of_week
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extract_element(sitr, stream_end, of); // "of" element
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facet.get(sitr, stream_end, a_ios, m); // month
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return nth_kday_type(wn, wd, m);
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}
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//! returns first_kday_of_week parsed from stream
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template<class facet_type>
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first_kday_type
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get_first_kday_type(stream_itr_type& sitr,
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stream_itr_type& stream_end,
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std::ios_base& a_ios,
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const facet_type& facet) const
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{
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// skip leading whitespace
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while(std::isspace(*sitr) && sitr != stream_end) { ++sitr; }
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day_of_week_type wd(0); // no default constructor
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month_type m(1); // no default constructor
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extract_element(sitr, stream_end, first); // "first" element
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facet.get(sitr, stream_end, a_ios, wd); // day_of_week
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extract_element(sitr, stream_end, of); // "of" element
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facet.get(sitr, stream_end, a_ios, m); // month
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return first_kday_type(wd, m);
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}
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//! returns last_kday_of_week parsed from stream
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template<class facet_type>
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last_kday_type
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get_last_kday_type(stream_itr_type& sitr,
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stream_itr_type& stream_end,
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std::ios_base& a_ios,
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const facet_type& facet) const
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{
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// skip leading whitespace
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while(std::isspace(*sitr) && sitr != stream_end) { ++sitr; }
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day_of_week_type wd(0); // no default constructor
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month_type m(1); // no default constructor
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extract_element(sitr, stream_end, last); // "last" element
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facet.get(sitr, stream_end, a_ios, wd); // day_of_week
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extract_element(sitr, stream_end, of); // "of" element
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facet.get(sitr, stream_end, a_ios, m); // month
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return last_kday_type(wd, m);
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}
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//! returns first_kday_of_week parsed from stream
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template<class facet_type>
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kday_before_type
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get_kday_before_type(stream_itr_type& sitr,
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stream_itr_type& stream_end,
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std::ios_base& a_ios,
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const facet_type& facet) const
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{
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// skip leading whitespace
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while(std::isspace(*sitr) && sitr != stream_end) { ++sitr; }
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day_of_week_type wd(0); // no default constructor
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facet.get(sitr, stream_end, a_ios, wd); // day_of_week
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extract_element(sitr, stream_end, before);// "before" element
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return kday_before_type(wd);
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}
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//! returns first_kday_of_week parsed from stream
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template<class facet_type>
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kday_after_type
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get_kday_after_type(stream_itr_type& sitr,
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stream_itr_type& stream_end,
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std::ios_base& a_ios,
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const facet_type& facet) const
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{
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// skip leading whitespace
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while(std::isspace(*sitr) && sitr != stream_end) { ++sitr; }
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day_of_week_type wd(0); // no default constructor
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facet.get(sitr, stream_end, a_ios, wd); // day_of_week
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extract_element(sitr, stream_end, after); // "after" element
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return kday_after_type(wd);
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}
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private:
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parse_tree_type m_element_strings;
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//! Extracts phrase element from input. Throws ios_base::failure on error.
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void extract_element(stream_itr_type& sitr,
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stream_itr_type& stream_end,
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typename date_generator_parser::phrase_elements ele) const
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{
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// skip leading whitespace
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while(std::isspace(*sitr) && sitr != stream_end) { ++sitr; }
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match_results mr = m_element_strings.match(sitr, stream_end);
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if(mr.current_match != ele) {
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boost::throw_exception(std::ios_base::failure("Parse failed. No match found for '" + mr.cache + "'"));
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}
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}
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};
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template<class date_type, class CharT>
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const typename date_generator_parser<date_type, CharT>::char_type
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date_generator_parser<date_type, CharT>::first_string[6] =
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{'f','i','r','s','t'};
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template<class date_type, class CharT>
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const typename date_generator_parser<date_type, CharT>::char_type
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date_generator_parser<date_type, CharT>::second_string[7] =
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{'s','e','c','o','n','d'};
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template<class date_type, class CharT>
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const typename date_generator_parser<date_type, CharT>::char_type
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date_generator_parser<date_type, CharT>::third_string[6] =
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{'t','h','i','r','d'};
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template<class date_type, class CharT>
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const typename date_generator_parser<date_type, CharT>::char_type
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date_generator_parser<date_type, CharT>::fourth_string[7] =
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{'f','o','u','r','t','h'};
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template<class date_type, class CharT>
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const typename date_generator_parser<date_type, CharT>::char_type
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date_generator_parser<date_type, CharT>::fifth_string[6] =
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{'f','i','f','t','h'};
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template<class date_type, class CharT>
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const typename date_generator_parser<date_type, CharT>::char_type
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date_generator_parser<date_type, CharT>::last_string[5] =
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{'l','a','s','t'};
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template<class date_type, class CharT>
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const typename date_generator_parser<date_type, CharT>::char_type
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date_generator_parser<date_type, CharT>::before_string[8] =
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{'b','e','f','o','r','e'};
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template<class date_type, class CharT>
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const typename date_generator_parser<date_type, CharT>::char_type
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date_generator_parser<date_type, CharT>::after_string[6] =
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{'a','f','t','e','r'};
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template<class date_type, class CharT>
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const typename date_generator_parser<date_type, CharT>::char_type
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date_generator_parser<date_type, CharT>::of_string[3] =
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{'o','f'};
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} } //namespace
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#endif // DATE_TIME_DATE_GENERATOR_PARSER_HPP__
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