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Diffstat (limited to 'ext/boost/date_time/period_parser.hpp')
| -rw-r--r-- | ext/boost/date_time/period_parser.hpp | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/ext/boost/date_time/period_parser.hpp b/ext/boost/date_time/period_parser.hpp new file mode 100644 index 0000000000..9cd57e18c7 --- /dev/null +++ b/ext/boost/date_time/period_parser.hpp @@ -0,0 +1,198 @@ + +#ifndef DATETIME_PERIOD_PARSER_HPP___ +#define DATETIME_PERIOD_PARSER_HPP___ + +/* Copyright (c) 2002-2004 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: 2008-11-13 15:10:23 -0500 (Thu, 13 Nov 2008) $ + */ + +#include <boost/throw_exception.hpp> +#include <boost/date_time/string_parse_tree.hpp> +#include <boost/date_time/string_convert.hpp> + + +namespace boost { namespace date_time { + + + //! Not a facet, but a class used to specify and control period parsing + /*! Provides settings for the following: + * - period_separator -- default '/' + * - period_open_start_delimeter -- default '[' + * - period_open_range_end_delimeter -- default ')' + * - period_closed_range_end_delimeter -- default ']' + * - display_as_open_range, display_as_closed_range -- default closed_range + * + * For a typical date_period, the contents of the input stream would be + *@code + * [2004-Jan-04/2004-Feb-01] + *@endcode + * where the date format is controlled by the date facet + */ + template<class date_type, typename CharT> + class period_parser { + public: + typedef std::basic_string<CharT> string_type; + typedef CharT char_type; + //typedef typename std::basic_string<char_type>::const_iterator const_itr_type; + typedef std::istreambuf_iterator<CharT> stream_itr_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; + + static const char_type default_period_separator[2]; + static const char_type default_period_start_delimeter[2]; + static const char_type default_period_open_range_end_delimeter[2]; + static const char_type default_period_closed_range_end_delimeter[2]; + + enum period_range_option { AS_OPEN_RANGE, AS_CLOSED_RANGE }; + + //! Constructor that sets up period parser options + period_parser(period_range_option range_opt = AS_CLOSED_RANGE, + const char_type* const period_separator = default_period_separator, + const char_type* const period_start_delimeter = default_period_start_delimeter, + const char_type* const period_open_range_end_delimeter = default_period_open_range_end_delimeter, + const char_type* const period_closed_range_end_delimeter = default_period_closed_range_end_delimeter) + : m_range_option(range_opt) + { + delimiters.push_back(string_type(period_separator)); + delimiters.push_back(string_type(period_start_delimeter)); + delimiters.push_back(string_type(period_open_range_end_delimeter)); + delimiters.push_back(string_type(period_closed_range_end_delimeter)); + } + + period_parser(const period_parser<date_type,CharT>& p_parser) + { + this->delimiters = p_parser.delimiters; + this->m_range_option = p_parser.m_range_option; + } + + period_range_option range_option() const + { + return m_range_option; + } + void range_option(period_range_option option) + { + m_range_option = option; + } + collection_type delimiter_strings() const + { + return delimiters; + } + void delimiter_strings(const string_type& separator, + const string_type& start_delim, + const string_type& open_end_delim, + const string_type& closed_end_delim) + { + delimiters.clear(); + delimiters.push_back(separator); + delimiters.push_back(start_delim); + delimiters.push_back(open_end_delim); + delimiters.push_back(closed_end_delim); + } + + //! Generic code to parse a period -- no matter the period type. + /*! This generic code will parse any period using a facet to + * to get the 'elements'. For example, in the case of a date_period + * the elements will be instances of a date which will be parsed + * according the to setup in the passed facet parameter. + * + * The steps for parsing a period are always the same: + * - consume the start delimiter + * - get start element + * - consume the separator + * - get either last or end element depending on range settings + * - consume the end delimeter depending on range settings + * + * Thus for a typical date period the contents of the input stream + * might look like this: + *@code + * + * [March 01, 2004/June 07, 2004] <-- closed range + * [March 01, 2004/June 08, 2004) <-- open range + * + *@endcode + */ + template<class period_type, class duration_type, class facet_type> + period_type get_period(stream_itr_type& sitr, + stream_itr_type& stream_end, + std::ios_base& a_ios, + const period_type& /* p */, + const duration_type& dur_unit, + const facet_type& facet) const + { + // skip leading whitespace + while(std::isspace(*sitr) && sitr != stream_end) { ++sitr; } + + typedef typename period_type::point_type point_type; + point_type p1(not_a_date_time), p2(not_a_date_time); + + + consume_delim(sitr, stream_end, delimiters[START]); // start delim + facet.get(sitr, stream_end, a_ios, p1); // first point + consume_delim(sitr, stream_end, delimiters[SEPARATOR]); // separator + facet.get(sitr, stream_end, a_ios, p2); // second point + + // period construction parameters are always open range [begin, end) + if (m_range_option == AS_CLOSED_RANGE) { + consume_delim(sitr, stream_end, delimiters[CLOSED_END]);// end delim + // add 1 duration unit to p2 to make range open + p2 += dur_unit; + } + else { + consume_delim(sitr, stream_end, delimiters[OPEN_END]); // end delim + } + + return period_type(p1, p2); + } + + private: + collection_type delimiters; + period_range_option m_range_option; + + enum delim_ids { SEPARATOR, START, OPEN_END, CLOSED_END }; + + //! throws ios_base::failure if delimiter and parsed data do not match + void consume_delim(stream_itr_type& sitr, + stream_itr_type& stream_end, + const string_type& delim) const + { + /* string_parse_tree will not parse a string of punctuation characters + * without knowing exactly how many characters to process + * Ex [2000. Will not parse out the '[' string without knowing + * to process only one character. By using length of the delimiter + * string we can safely iterate past it. */ + string_type s; + for(unsigned int i = 0; i < delim.length() && sitr != stream_end; ++i) { + s += *sitr; + ++sitr; + } + if(s != delim) { + boost::throw_exception(std::ios_base::failure("Parse failed. Expected '" + + convert_string_type<char_type,char>(delim) + "' but found '" + convert_string_type<char_type,char>(s) + "'")); + } + } + }; + + template <class date_type, class char_type> + const typename period_parser<date_type, char_type>::char_type + period_parser<date_type, char_type>::default_period_separator[2] = {'/'}; + + template <class date_type, class char_type> + const typename period_parser<date_type, char_type>::char_type + period_parser<date_type, char_type>::default_period_start_delimeter[2] = {'['}; + + template <class date_type, class char_type> + const typename period_parser<date_type, char_type>::char_type + period_parser<date_type, char_type>::default_period_open_range_end_delimeter[2] = {')'}; + + template <class date_type, class char_type> + const typename period_parser<date_type, char_type>::char_type + period_parser<date_type, char_type>::default_period_closed_range_end_delimeter[2] = {']'}; + + } } //namespace boost::date_time + +#endif // DATETIME_PERIOD_PARSER_HPP___ |