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159 lines
6.1 KiB
159 lines
6.1 KiB
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#ifndef DATE_TIME_SPECIAL_VALUES_PARSER_HPP__ |
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#define DATE_TIME_SPECIAL_VALUES_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 "boost/date_time/string_parse_tree.hpp" |
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#include "boost/date_time/special_defs.hpp" |
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#include <string> |
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#include <vector> |
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namespace boost { namespace date_time { |
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//! Class for special_value parsing |
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/*! |
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* TODO: add doc-comments for which elements can be changed |
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* Parses input stream for strings representing special_values. |
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* Special values parsed are: |
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* - not_a_date_time |
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* - neg_infin |
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* - pod_infin |
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* - min_date_time |
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* - max_date_time |
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*/ |
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template<class date_type, typename charT> |
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class special_values_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::basic_stringstream<charT> stringstream_type; |
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typedef std::istreambuf_iterator<charT> stream_itr_type; |
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//typedef typename string_type::const_iterator const_itr; |
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//typedef typename date_type::year_type year_type; |
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//typedef typename date_type::month_type month_type; |
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typedef typename date_type::duration_type duration_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 charT char_type; |
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static const char_type nadt_string[16]; |
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static const char_type neg_inf_string[10]; |
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static const char_type pos_inf_string[10]; |
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static const char_type min_date_time_string[18]; |
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static const char_type max_date_time_string[18]; |
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//! Creates a special_values_parser with the default set of "sv_strings" |
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special_values_parser() |
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{ |
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sv_strings(string_type(nadt_string), |
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string_type(neg_inf_string), |
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string_type(pos_inf_string), |
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string_type(min_date_time_string), |
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string_type(max_date_time_string)); |
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} |
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//! Creates a special_values_parser using a user defined set of element strings |
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special_values_parser(const string_type& nadt_str, |
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const string_type& neg_inf_str, |
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const string_type& pos_inf_str, |
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const string_type& min_dt_str, |
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const string_type& max_dt_str) |
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{ |
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sv_strings(nadt_str, neg_inf_str, pos_inf_str, min_dt_str, max_dt_str); |
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} |
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special_values_parser(typename collection_type::iterator beg, typename collection_type::iterator end) |
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{ |
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collection_type phrases; |
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std::copy(beg, end, std::back_inserter(phrases)); |
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m_sv_strings = parse_tree_type(phrases, static_cast<int>(not_a_date_time)); |
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} |
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special_values_parser(const special_values_parser<date_type,charT>& svp) |
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{ |
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this->m_sv_strings = svp.m_sv_strings; |
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} |
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//! Replace special value strings |
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void sv_strings(const string_type& nadt_str, |
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const string_type& neg_inf_str, |
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const string_type& pos_inf_str, |
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const string_type& min_dt_str, |
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const string_type& max_dt_str) |
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{ |
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collection_type phrases; |
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phrases.push_back(nadt_str); |
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phrases.push_back(neg_inf_str); |
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phrases.push_back(pos_inf_str); |
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phrases.push_back(min_dt_str); |
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phrases.push_back(max_dt_str); |
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m_sv_strings = parse_tree_type(phrases, static_cast<int>(not_a_date_time)); |
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} |
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/* Does not return a special_value because if the parsing fails, |
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* the return value will always be not_a_date_time |
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* (mr.current_match retains its default value of -1 on a failed |
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* parse and that casts to not_a_date_time). */ |
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//! Sets match_results.current_match to the corresponding special_value or -1 |
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bool match(stream_itr_type& sitr, |
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stream_itr_type& str_end, |
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match_results& mr) const |
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{ |
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unsigned int level = 0; |
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m_sv_strings.match(sitr, str_end, mr, level); |
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return (mr.current_match != match_results::PARSE_ERROR); |
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} |
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/*special_values match(stream_itr_type& sitr, |
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stream_itr_type& str_end, |
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match_results& mr) const |
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{ |
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unsigned int level = 0; |
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m_sv_strings.match(sitr, str_end, mr, level); |
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if(mr.current_match == match_results::PARSE_ERROR) { |
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throw std::ios_base::failure("Parse failed. No match found for '" + mr.cache + "'"); |
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} |
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return static_cast<special_values>(mr.current_match); |
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}*/ |
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private: |
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parse_tree_type m_sv_strings; |
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}; |
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template<class date_type, class CharT> |
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const typename special_values_parser<date_type, CharT>::char_type |
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special_values_parser<date_type, CharT>::nadt_string[16] = |
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{'n','o','t','-','a','-','d','a','t','e','-','t','i','m','e'}; |
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template<class date_type, class CharT> |
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const typename special_values_parser<date_type, CharT>::char_type |
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special_values_parser<date_type, CharT>::neg_inf_string[10] = |
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{'-','i','n','f','i','n','i','t','y'}; |
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template<class date_type, class CharT> |
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const typename special_values_parser<date_type, CharT>::char_type |
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special_values_parser<date_type, CharT>::pos_inf_string[10] = |
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{'+','i','n','f','i','n','i','t','y'}; |
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template<class date_type, class CharT> |
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const typename special_values_parser<date_type, CharT>::char_type |
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special_values_parser<date_type, CharT>::min_date_time_string[18] = |
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{'m','i','n','i','m','u','m','-','d','a','t','e','-','t','i','m','e'}; |
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template<class date_type, class CharT> |
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const typename special_values_parser<date_type, CharT>::char_type |
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special_values_parser<date_type, CharT>::max_date_time_string[18] = |
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{'m','a','x','i','m','u','m','-','d','a','t','e','-','t','i','m','e'}; |
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} } //namespace |
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#endif // DATE_TIME_SPECIAL_VALUES_PARSER_HPP__ |
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