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198 lines
7.9 KiB
198 lines
7.9 KiB
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#ifndef DATETIME_PERIOD_PARSER_HPP___ |
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#define DATETIME_PERIOD_PARSER_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: 2008-11-13 15:10:23 -0500 (Thu, 13 Nov 2008) $ |
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*/ |
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#include <boost/throw_exception.hpp> |
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#include <boost/date_time/string_parse_tree.hpp> |
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#include <boost/date_time/string_convert.hpp> |
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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 parsing |
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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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* For a typical date_period, the contents of the input stream 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 format is controlled by the date facet |
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*/ |
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template<class date_type, typename CharT> |
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class period_parser { |
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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::istreambuf_iterator<CharT> stream_itr_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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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 period_range_option { AS_OPEN_RANGE, AS_CLOSED_RANGE }; |
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//! Constructor that sets up period parser options |
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period_parser(period_range_option range_opt = 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_opt) |
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{ |
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delimiters.push_back(string_type(period_separator)); |
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delimiters.push_back(string_type(period_start_delimeter)); |
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delimiters.push_back(string_type(period_open_range_end_delimeter)); |
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delimiters.push_back(string_type(period_closed_range_end_delimeter)); |
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} |
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period_parser(const period_parser<date_type,CharT>& p_parser) |
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{ |
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this->delimiters = p_parser.delimiters; |
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this->m_range_option = p_parser.m_range_option; |
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} |
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period_range_option range_option() const |
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{ |
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return m_range_option; |
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} |
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void range_option(period_range_option option) |
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{ |
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m_range_option = option; |
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} |
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collection_type delimiter_strings() const |
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{ |
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return delimiters; |
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} |
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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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delimiters.clear(); |
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delimiters.push_back(separator); |
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delimiters.push_back(start_delim); |
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delimiters.push_back(open_end_delim); |
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delimiters.push_back(closed_end_delim); |
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} |
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//! Generic code to parse a period -- no matter the period type. |
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/*! This generic code will parse any period using a facet to |
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* to get 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 parsed |
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* according the to setup in the passed facet parameter. |
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* |
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* The steps for parsing a period are always the same: |
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* - consume the start delimiter |
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* - get start element |
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* - consume the separator |
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* - get either last or end element depending on range settings |
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* - consume the end delimeter depending on range settings |
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* |
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* Thus for a typical date period the contents of the input stream |
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* 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 duration_type, class facet_type> |
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period_type get_period(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 period_type& /* p */, |
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const duration_type& dur_unit, |
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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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typedef typename period_type::point_type point_type; |
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point_type p1(not_a_date_time), p2(not_a_date_time); |
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consume_delim(sitr, stream_end, delimiters[START]); // start delim |
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facet.get(sitr, stream_end, a_ios, p1); // first point |
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consume_delim(sitr, stream_end, delimiters[SEPARATOR]); // separator |
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facet.get(sitr, stream_end, a_ios, p2); // second point |
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// period construction parameters are always open range [begin, end) |
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if (m_range_option == AS_CLOSED_RANGE) { |
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consume_delim(sitr, stream_end, delimiters[CLOSED_END]);// end delim |
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// add 1 duration unit to p2 to make range open |
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p2 += dur_unit; |
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} |
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else { |
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consume_delim(sitr, stream_end, delimiters[OPEN_END]); // end delim |
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} |
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return period_type(p1, p2); |
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} |
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private: |
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collection_type delimiters; |
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period_range_option m_range_option; |
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enum delim_ids { SEPARATOR, START, OPEN_END, CLOSED_END }; |
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//! throws ios_base::failure if delimiter and parsed data do not match |
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void consume_delim(stream_itr_type& sitr, |
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stream_itr_type& stream_end, |
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const string_type& delim) const |
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{ |
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/* string_parse_tree will not parse a string of punctuation characters |
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* without knowing exactly how many characters to process |
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* Ex [2000. Will not parse out the '[' string without knowing |
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* to process only one character. By using length of the delimiter |
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* string we can safely iterate past it. */ |
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string_type s; |
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for(unsigned int i = 0; i < delim.length() && sitr != stream_end; ++i) { |
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s += *sitr; |
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++sitr; |
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} |
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if(s != delim) { |
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boost::throw_exception(std::ios_base::failure("Parse failed. Expected '" |
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+ convert_string_type<char_type,char>(delim) + "' but found '" + convert_string_type<char_type,char>(s) + "'")); |
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} |
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} |
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}; |
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template <class date_type, class char_type> |
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const typename period_parser<date_type, char_type>::char_type |
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period_parser<date_type, char_type>::default_period_separator[2] = {'/'}; |
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template <class date_type, class char_type> |
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const typename period_parser<date_type, char_type>::char_type |
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period_parser<date_type, char_type>::default_period_start_delimeter[2] = {'['}; |
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template <class date_type, class char_type> |
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const typename period_parser<date_type, char_type>::char_type |
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period_parser<date_type, char_type>::default_period_open_range_end_delimeter[2] = {')'}; |
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template <class date_type, class char_type> |
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const typename period_parser<date_type, char_type>::char_type |
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period_parser<date_type, char_type>::default_period_closed_range_end_delimeter[2] = {']'}; |
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} } //namespace boost::date_time |
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#endif // DATETIME_PERIOD_PARSER_HPP___
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