| |
| #ifndef DATE_TIME_DATE_GENERATOR_PARSER_HPP__ |
| #define DATE_TIME_DATE_GENERATOR_PARSER_HPP__ |
| |
| /* Copyright (c) 2005 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: 2008-11-12 14:37:53 -0500 (Wed, 12 Nov 2008) $ |
| */ |
| |
| #include <string> |
| #include <vector> |
| #include <iterator> // istreambuf_iterator |
| #include <boost/throw_exception.hpp> |
| #include <boost/date_time/compiler_config.hpp> |
| #include <boost/date_time/string_parse_tree.hpp> |
| #include <boost/date_time/date_generators.hpp> |
| #include <boost/date_time/format_date_parser.hpp> |
| |
| namespace boost { namespace date_time { |
| |
| //! Class for date_generator parsing |
| /*! The elements of a date_generator "phrase" are parsed from the input stream in a |
| * particular order. All elements are required and the order in which they appear |
| * cannot change, however, the elements themselves can be changed. The default |
| * elements and their order are as follows: |
| * |
| * - partial_date => "dd Month" |
| * - nth_day_of_the_week_in_month => "nth weekday of month" |
| * - first_day_of_the_week_in_month => "first weekday of month" |
| * - last_day_of_the_week_in_month => "last weekday of month" |
| * - first_day_of_the_week_after => "weekday after" |
| * - first_day_of_the_week_before => "weekday before" |
| * |
| * Weekday and Month names and formats are handled via the date_input_facet. |
| * |
| */ |
| template<class date_type, typename charT> |
| class date_generator_parser |
| { |
| public: |
| typedef std::basic_string<charT> string_type; |
| typedef std::istreambuf_iterator<charT> stream_itr_type; |
| |
| typedef typename date_type::month_type month_type; |
| typedef typename date_type::day_of_week_type day_of_week_type; |
| typedef typename date_type::day_type day_type; |
| |
| typedef string_parse_tree<charT> parse_tree_type; |
| typedef typename parse_tree_type::parse_match_result_type match_results; |
| typedef std::vector<std::basic_string<charT> > collection_type; |
| |
| typedef partial_date<date_type> partial_date_type; |
| typedef nth_kday_of_month<date_type> nth_kday_type; |
| typedef first_kday_of_month<date_type> first_kday_type; |
| typedef last_kday_of_month<date_type> last_kday_type; |
| typedef first_kday_after<date_type> kday_after_type; |
| typedef first_kday_before<date_type> kday_before_type; |
| |
| typedef charT char_type; |
| static const char_type first_string[6]; |
| static const char_type second_string[7]; |
| static const char_type third_string[6]; |
| static const char_type fourth_string[7]; |
| static const char_type fifth_string[6]; |
| static const char_type last_string[5]; |
| static const char_type before_string[8]; |
| static const char_type after_string[6]; |
| static const char_type of_string[3]; |
| |
| enum phrase_elements {first=0, second, third, fourth, fifth, last, |
| before, after, of, number_of_phrase_elements}; |
| |
| //! Creates a date_generator_parser with the default set of "element_strings" |
| date_generator_parser() |
| { |
| element_strings(string_type(first_string), |
| string_type(second_string), |
| string_type(third_string), |
| string_type(fourth_string), |
| string_type(fifth_string), |
| string_type(last_string), |
| string_type(before_string), |
| string_type(after_string), |
| string_type(of_string)); |
| } |
| |
| //! Creates a date_generator_parser using a user defined set of element strings |
| date_generator_parser(const string_type& first_str, |
| const string_type& second_str, |
| const string_type& third_str, |
| const string_type& fourth_str, |
| const string_type& fifth_str, |
| const string_type& last_str, |
| const string_type& before_str, |
| const string_type& after_str, |
| const string_type& of_str) |
| { |
| element_strings(first_str, second_str, third_str, fourth_str, fifth_str, |
| last_str, before_str, after_str, of_str); |
| } |
| |
| //! Replace strings that determine nth week for generator |
| void element_strings(const string_type& first_str, |
| const string_type& second_str, |
| const string_type& third_str, |
| const string_type& fourth_str, |
| const string_type& fifth_str, |
| const string_type& last_str, |
| const string_type& before_str, |
| const string_type& after_str, |
| const string_type& of_str) |
| { |
| collection_type phrases; |
| phrases.push_back(first_str); |
| phrases.push_back(second_str); |
| phrases.push_back(third_str); |
| phrases.push_back(fourth_str); |
| phrases.push_back(fifth_str); |
| phrases.push_back(last_str); |
| phrases.push_back(before_str); |
| phrases.push_back(after_str); |
| phrases.push_back(of_str); |
| m_element_strings = parse_tree_type(phrases, this->first); // enum first |
| } |
| |
| void element_strings(const collection_type& col) |
| { |
| m_element_strings = parse_tree_type(col, this->first); // enum first |
| } |
| |
| //! returns partial_date parsed from stream |
| template<class facet_type> |
| partial_date_type |
| get_partial_date_type(stream_itr_type& sitr, |
| stream_itr_type& stream_end, |
| std::ios_base& a_ios, |
| const facet_type& facet) const |
| { |
| // skip leading whitespace |
| while(std::isspace(*sitr) && sitr != stream_end) { ++sitr; } |
| |
| day_type d(1); |
| month_type m(1); |
| facet.get(sitr, stream_end, a_ios, d); |
| facet.get(sitr, stream_end, a_ios, m); |
| |
| return partial_date_type(d,m); |
| } |
| |
| //! returns nth_kday_of_week parsed from stream |
| template<class facet_type> |
| nth_kday_type |
| get_nth_kday_type(stream_itr_type& sitr, |
| stream_itr_type& stream_end, |
| std::ios_base& a_ios, |
| const facet_type& facet) const |
| { |
| // skip leading whitespace |
| while(std::isspace(*sitr) && sitr != stream_end) { ++sitr; } |
| |
| typename nth_kday_type::week_num wn; |
| day_of_week_type wd(0); // no default constructor |
| month_type m(1); // no default constructor |
| |
| match_results mr = m_element_strings.match(sitr, stream_end); |
| switch(mr.current_match) { |
| case first : { wn = nth_kday_type::first; break; } |
| case second : { wn = nth_kday_type::second; break; } |
| case third : { wn = nth_kday_type::third; break; } |
| case fourth : { wn = nth_kday_type::fourth; break; } |
| case fifth : { wn = nth_kday_type::fifth; break; } |
| default: |
| { |
| boost::throw_exception(std::ios_base::failure("Parse failed. No match found for '" + mr.cache + "'")); |
| BOOST_DATE_TIME_UNREACHABLE_EXPRESSION(wn = nth_kday_type::first); |
| } |
| } // week num |
| facet.get(sitr, stream_end, a_ios, wd); // day_of_week |
| extract_element(sitr, stream_end, of); // "of" element |
| facet.get(sitr, stream_end, a_ios, m); // month |
| |
| return nth_kday_type(wn, wd, m); |
| } |
| |
| //! returns first_kday_of_week parsed from stream |
| template<class facet_type> |
| first_kday_type |
| get_first_kday_type(stream_itr_type& sitr, |
| stream_itr_type& stream_end, |
| std::ios_base& a_ios, |
| const facet_type& facet) const |
| { |
| // skip leading whitespace |
| while(std::isspace(*sitr) && sitr != stream_end) { ++sitr; } |
| |
| day_of_week_type wd(0); // no default constructor |
| month_type m(1); // no default constructor |
| |
| extract_element(sitr, stream_end, first); // "first" element |
| facet.get(sitr, stream_end, a_ios, wd); // day_of_week |
| extract_element(sitr, stream_end, of); // "of" element |
| facet.get(sitr, stream_end, a_ios, m); // month |
| |
| |
| return first_kday_type(wd, m); |
| } |
| |
| //! returns last_kday_of_week parsed from stream |
| template<class facet_type> |
| last_kday_type |
| get_last_kday_type(stream_itr_type& sitr, |
| stream_itr_type& stream_end, |
| std::ios_base& a_ios, |
| const facet_type& facet) const |
| { |
| // skip leading whitespace |
| while(std::isspace(*sitr) && sitr != stream_end) { ++sitr; } |
| |
| day_of_week_type wd(0); // no default constructor |
| month_type m(1); // no default constructor |
| |
| extract_element(sitr, stream_end, last); // "last" element |
| facet.get(sitr, stream_end, a_ios, wd); // day_of_week |
| extract_element(sitr, stream_end, of); // "of" element |
| facet.get(sitr, stream_end, a_ios, m); // month |
| |
| |
| return last_kday_type(wd, m); |
| } |
| |
| //! returns first_kday_of_week parsed from stream |
| template<class facet_type> |
| kday_before_type |
| get_kday_before_type(stream_itr_type& sitr, |
| stream_itr_type& stream_end, |
| std::ios_base& a_ios, |
| const facet_type& facet) const |
| { |
| // skip leading whitespace |
| while(std::isspace(*sitr) && sitr != stream_end) { ++sitr; } |
| |
| day_of_week_type wd(0); // no default constructor |
| |
| facet.get(sitr, stream_end, a_ios, wd); // day_of_week |
| extract_element(sitr, stream_end, before);// "before" element |
| |
| return kday_before_type(wd); |
| } |
| |
| //! returns first_kday_of_week parsed from stream |
| template<class facet_type> |
| kday_after_type |
| get_kday_after_type(stream_itr_type& sitr, |
| stream_itr_type& stream_end, |
| std::ios_base& a_ios, |
| const facet_type& facet) const |
| { |
| // skip leading whitespace |
| while(std::isspace(*sitr) && sitr != stream_end) { ++sitr; } |
| |
| day_of_week_type wd(0); // no default constructor |
| |
| facet.get(sitr, stream_end, a_ios, wd); // day_of_week |
| extract_element(sitr, stream_end, after); // "after" element |
| |
| return kday_after_type(wd); |
| } |
| |
| private: |
| parse_tree_type m_element_strings; |
| |
| //! Extracts phrase element from input. Throws ios_base::failure on error. |
| void extract_element(stream_itr_type& sitr, |
| stream_itr_type& stream_end, |
| typename date_generator_parser::phrase_elements ele) const |
| { |
| // skip leading whitespace |
| while(std::isspace(*sitr) && sitr != stream_end) { ++sitr; } |
| match_results mr = m_element_strings.match(sitr, stream_end); |
| if(mr.current_match != ele) { |
| boost::throw_exception(std::ios_base::failure("Parse failed. No match found for '" + mr.cache + "'")); |
| } |
| } |
| |
| }; |
| |
| template<class date_type, class CharT> |
| const typename date_generator_parser<date_type, CharT>::char_type |
| date_generator_parser<date_type, CharT>::first_string[6] = |
| {'f','i','r','s','t'}; |
| template<class date_type, class CharT> |
| const typename date_generator_parser<date_type, CharT>::char_type |
| date_generator_parser<date_type, CharT>::second_string[7] = |
| {'s','e','c','o','n','d'}; |
| template<class date_type, class CharT> |
| const typename date_generator_parser<date_type, CharT>::char_type |
| date_generator_parser<date_type, CharT>::third_string[6] = |
| {'t','h','i','r','d'}; |
| template<class date_type, class CharT> |
| const typename date_generator_parser<date_type, CharT>::char_type |
| date_generator_parser<date_type, CharT>::fourth_string[7] = |
| {'f','o','u','r','t','h'}; |
| template<class date_type, class CharT> |
| const typename date_generator_parser<date_type, CharT>::char_type |
| date_generator_parser<date_type, CharT>::fifth_string[6] = |
| {'f','i','f','t','h'}; |
| template<class date_type, class CharT> |
| const typename date_generator_parser<date_type, CharT>::char_type |
| date_generator_parser<date_type, CharT>::last_string[5] = |
| {'l','a','s','t'}; |
| template<class date_type, class CharT> |
| const typename date_generator_parser<date_type, CharT>::char_type |
| date_generator_parser<date_type, CharT>::before_string[8] = |
| {'b','e','f','o','r','e'}; |
| template<class date_type, class CharT> |
| const typename date_generator_parser<date_type, CharT>::char_type |
| date_generator_parser<date_type, CharT>::after_string[6] = |
| {'a','f','t','e','r'}; |
| template<class date_type, class CharT> |
| const typename date_generator_parser<date_type, CharT>::char_type |
| date_generator_parser<date_type, CharT>::of_string[3] = |
| {'o','f'}; |
| |
| } } //namespace |
| |
| #endif // DATE_TIME_DATE_GENERATOR_PARSER_HPP__ |
| |