199 lines
8.0 KiB
C++
199 lines
8.0 KiB
C++
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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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* $Date$
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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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