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743 lines
24 KiB
743 lines
24 KiB
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#ifndef DATE_TIME_FORMAT_DATE_PARSER_HPP__ |
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#define DATE_TIME_FORMAT_DATE_PARSER_HPP__ |
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/* Copyright (c) 2004-2005 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: 2009-06-04 04:24:49 -0400 (Thu, 04 Jun 2009) $ |
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*/ |
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#include "boost/lexical_cast.hpp" |
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#include "boost/date_time/string_parse_tree.hpp" |
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#include "boost/date_time/strings_from_facet.hpp" |
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#include "boost/date_time/special_values_parser.hpp" |
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#include <string> |
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#include <vector> |
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#include <sstream> |
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#include <iterator> |
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#ifndef BOOST_NO_STDC_NAMESPACE |
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# include <cctype> |
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#else |
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# include <ctype.h> |
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#endif |
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#ifdef BOOST_NO_STDC_NAMESPACE |
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namespace std { |
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using ::isspace; |
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using ::isdigit; |
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} |
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#endif |
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namespace boost { namespace date_time { |
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//! Helper function for parsing fixed length strings into integers |
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/*! Will consume 'length' number of characters from stream. Consumed |
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* character are transfered to parse_match_result struct. |
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* Returns '-1' if no number can be parsed or incorrect number of |
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* digits in stream. */ |
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template<typename int_type, typename charT> |
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inline |
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int_type |
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fixed_string_to_int(std::istreambuf_iterator<charT>& itr, |
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std::istreambuf_iterator<charT>& stream_end, |
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parse_match_result<charT>& mr, |
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unsigned int length, |
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const charT& fill_char) |
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{ |
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//typedef std::basic_string<charT> string_type; |
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unsigned int j = 0; |
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//string_type s; |
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while (j < length && itr != stream_end && |
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(std::isdigit(*itr) || *itr == fill_char)) { |
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if(*itr == fill_char) { |
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/* Since a fill_char can be anything, we convert it to a zero. |
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* lexical_cast will behave predictably when zero is used as fill. */ |
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mr.cache += ('0'); |
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} |
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else { |
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mr.cache += (*itr); |
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} |
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itr++; |
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j++; |
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} |
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int_type i = -1; |
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// mr.cache will hold leading zeros. size() tells us when input is too short. |
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if(mr.cache.size() < length) { |
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return i; |
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} |
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try { |
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i = boost::lexical_cast<int_type>(mr.cache); |
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}catch(bad_lexical_cast&){ |
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// we want to return -1 if the cast fails so nothing to do here |
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} |
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return i; |
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} |
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|
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//! Helper function for parsing fixed length strings into integers |
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/*! Will consume 'length' number of characters from stream. Consumed |
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* character are transfered to parse_match_result struct. |
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* Returns '-1' if no number can be parsed or incorrect number of |
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* digits in stream. */ |
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template<typename int_type, typename charT> |
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inline |
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int_type |
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fixed_string_to_int(std::istreambuf_iterator<charT>& itr, |
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std::istreambuf_iterator<charT>& stream_end, |
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parse_match_result<charT>& mr, |
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unsigned int length) |
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{ |
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return fixed_string_to_int<int_type, charT>(itr, stream_end, mr, length, '0'); |
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} |
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//! Helper function for parsing varied length strings into integers |
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/*! Will consume 'max_length' characters from stream only if those |
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* characters are digits. Returns '-1' if no number can be parsed. |
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* Will not parse a number preceeded by a '+' or '-'. */ |
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template<typename int_type, typename charT> |
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inline |
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int_type |
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var_string_to_int(std::istreambuf_iterator<charT>& itr, |
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const std::istreambuf_iterator<charT>& stream_end, |
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unsigned int max_length) |
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{ |
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typedef std::basic_string<charT> string_type; |
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unsigned int j = 0; |
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string_type s; |
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while (itr != stream_end && (j < max_length) && std::isdigit(*itr)) { |
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s += (*itr); |
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++itr; |
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++j; |
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} |
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int_type i = -1; |
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if(!s.empty()) { |
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i = boost::lexical_cast<int_type>(s); |
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} |
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return i; |
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} |
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//! Class with generic date parsing using a format string |
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/*! The following is the set of recognized format specifiers |
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- %a - Short weekday name |
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- %A - Long weekday name |
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- %b - Abbreviated month name |
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- %B - Full month name |
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- %d - Day of the month as decimal 01 to 31 |
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- %j - Day of year as decimal from 001 to 366 |
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- %m - Month name as a decimal 01 to 12 |
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- %U - Week number 00 to 53 with first Sunday as the first day of week 1? |
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- %w - Weekday as decimal number 0 to 6 where Sunday == 0 |
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- %W - Week number 00 to 53 where Monday is first day of week 1 |
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- %x - facet default date representation |
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- %y - Year without the century - eg: 04 for 2004 |
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- %Y - Year with century |
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The weekday specifiers (%a and %A) do not add to the date construction, |
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but they provide a way to skip over the weekday names for formats that |
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provide them. |
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todo -- Another interesting feature that this approach could provide is |
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an option to fill in any missing fields with the current values |
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from the clock. So if you have %m-%d the parser would detect |
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the missing year value and fill it in using the clock. |
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todo -- What to do with the %x. %x in the classic facet is just bad... |
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*/ |
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template<class date_type, typename charT> |
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class format_date_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_istringstream<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::day_type day_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_of_year_type day_of_year_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> > input_collection_type; |
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// TODO sv_parser uses its default constructor - write the others |
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format_date_parser(const string_type& format_str, |
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const input_collection_type& month_short_names, |
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const input_collection_type& month_long_names, |
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const input_collection_type& weekday_short_names, |
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const input_collection_type& weekday_long_names) : |
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m_format(format_str), |
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m_month_short_names(month_short_names, 1), |
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m_month_long_names(month_long_names, 1), |
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m_weekday_short_names(weekday_short_names), |
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m_weekday_long_names(weekday_long_names) |
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{} |
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format_date_parser(const string_type& format_str, |
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const std::locale& locale) : |
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m_format(format_str), |
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m_month_short_names(gather_month_strings<charT>(locale), 1), |
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m_month_long_names(gather_month_strings<charT>(locale, false), 1), |
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m_weekday_short_names(gather_weekday_strings<charT>(locale)), |
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m_weekday_long_names(gather_weekday_strings<charT>(locale, false)) |
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{} |
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format_date_parser(const format_date_parser<date_type,charT>& fdp) |
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{ |
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this->m_format = fdp.m_format; |
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this->m_month_short_names = fdp.m_month_short_names; |
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this->m_month_long_names = fdp.m_month_long_names; |
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this->m_weekday_short_names = fdp.m_weekday_short_names; |
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this->m_weekday_long_names = fdp.m_weekday_long_names; |
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} |
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string_type format() const |
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{ |
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return m_format; |
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} |
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void format(string_type format_str) |
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{ |
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m_format = format_str; |
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} |
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void short_month_names(const input_collection_type& month_names) |
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{ |
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m_month_short_names = parse_tree_type(month_names, 1); |
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} |
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void long_month_names(const input_collection_type& month_names) |
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{ |
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m_month_long_names = parse_tree_type(month_names, 1); |
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} |
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void short_weekday_names(const input_collection_type& weekday_names) |
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{ |
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m_weekday_short_names = parse_tree_type(weekday_names); |
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} |
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void long_weekday_names(const input_collection_type& weekday_names) |
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{ |
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m_weekday_long_names = parse_tree_type(weekday_names); |
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} |
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date_type |
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parse_date(const string_type& value, |
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const string_type& format_str, |
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const special_values_parser<date_type,charT>& sv_parser) const |
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{ |
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stringstream_type ss(value); |
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stream_itr_type sitr(ss); |
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stream_itr_type stream_end; |
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return parse_date(sitr, stream_end, format_str, sv_parser); |
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} |
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date_type |
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parse_date(std::istreambuf_iterator<charT>& sitr, |
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std::istreambuf_iterator<charT>& stream_end, |
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const special_values_parser<date_type,charT>& sv_parser) const |
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{ |
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return parse_date(sitr, stream_end, m_format, sv_parser); |
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} |
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/*! Of all the objects that the format_date_parser can parse, only a |
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* date can be a special value. Therefore, only parse_date checks |
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* for special_values. */ |
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date_type |
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parse_date(std::istreambuf_iterator<charT>& sitr, |
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std::istreambuf_iterator<charT>& stream_end, |
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string_type format_str, |
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const special_values_parser<date_type,charT>& sv_parser) const |
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{ |
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bool use_current_char = false; |
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// skip leading whitespace |
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while(std::isspace(*sitr) && sitr != stream_end) { ++sitr; } |
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charT current_char = *sitr; |
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short year(0), month(0), day(0), day_of_year(0);// wkday(0); |
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/* Initialized the following to their minimum values. These intermediate |
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* objects are used so we get specific exceptions when part of the input |
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* is unparsable. |
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* Ex: "205-Jan-15" will throw a bad_year, "2005-Jsn-15"- bad_month, etc.*/ |
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year_type t_year(1400); |
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month_type t_month(1); |
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day_type t_day(1); |
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day_of_week_type wkday(0); |
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const_itr itr(format_str.begin()); |
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while (itr != format_str.end() && (sitr != stream_end)) { |
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if (*itr == '%') { |
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itr++; |
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if (*itr != '%') { |
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switch(*itr) { |
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case 'a': |
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{ |
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//this value is just throw away. It could be used for |
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//error checking potentially, but it isn't helpful in |
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//actually constructing the date - we just need to get it |
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//out of the stream |
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match_results mr = m_weekday_short_names.match(sitr, stream_end); |
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if(mr.current_match == match_results::PARSE_ERROR) { |
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// check special_values |
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if(sv_parser.match(sitr, stream_end, mr)) { |
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return date_type(static_cast<special_values>(mr.current_match)); |
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} |
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} |
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wkday = mr.current_match; |
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if (mr.has_remaining()) { |
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current_char = mr.last_char(); |
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use_current_char = true; |
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} |
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break; |
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} |
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case 'A': |
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{ |
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//this value is just throw away. It could be used for |
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//error checking potentially, but it isn't helpful in |
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//actually constructing the date - we just need to get it |
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//out of the stream |
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match_results mr = m_weekday_long_names.match(sitr, stream_end); |
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if(mr.current_match == match_results::PARSE_ERROR) { |
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// check special_values |
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if(sv_parser.match(sitr, stream_end, mr)) { |
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return date_type(static_cast<special_values>(mr.current_match)); |
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} |
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} |
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wkday = mr.current_match; |
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if (mr.has_remaining()) { |
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current_char = mr.last_char(); |
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use_current_char = true; |
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} |
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break; |
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} |
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case 'b': |
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{ |
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match_results mr = m_month_short_names.match(sitr, stream_end); |
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if(mr.current_match == match_results::PARSE_ERROR) { |
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// check special_values |
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if(sv_parser.match(sitr, stream_end, mr)) { |
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return date_type(static_cast<special_values>(mr.current_match)); |
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} |
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} |
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t_month = month_type(mr.current_match); |
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if (mr.has_remaining()) { |
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current_char = mr.last_char(); |
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use_current_char = true; |
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} |
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break; |
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} |
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case 'B': |
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{ |
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match_results mr = m_month_long_names.match(sitr, stream_end); |
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if(mr.current_match == match_results::PARSE_ERROR) { |
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// check special_values |
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if(sv_parser.match(sitr, stream_end, mr)) { |
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return date_type(static_cast<special_values>(mr.current_match)); |
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} |
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} |
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t_month = month_type(mr.current_match); |
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if (mr.has_remaining()) { |
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current_char = mr.last_char(); |
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use_current_char = true; |
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} |
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break; |
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} |
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case 'd': |
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{ |
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match_results mr; |
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day = fixed_string_to_int<short, charT>(sitr, stream_end, mr, 2); |
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if(day == -1) { |
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if(sv_parser.match(sitr, stream_end, mr)) { |
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return date_type(static_cast<special_values>(mr.current_match)); |
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} |
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} |
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t_day = day_type(day); |
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break; |
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} |
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case 'e': |
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{ |
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match_results mr; |
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day = fixed_string_to_int<short, charT>(sitr, stream_end, mr, 2, ' '); |
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if(day == -1) { |
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if(sv_parser.match(sitr, stream_end, mr)) { |
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return date_type(static_cast<special_values>(mr.current_match)); |
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} |
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} |
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t_day = day_type(day); |
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break; |
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} |
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case 'j': |
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{ |
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match_results mr; |
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day_of_year = fixed_string_to_int<short, charT>(sitr, stream_end, mr, 3); |
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if(day_of_year == -1) { |
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if(sv_parser.match(sitr, stream_end, mr)) { |
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return date_type(static_cast<special_values>(mr.current_match)); |
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} |
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} |
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// these next two lines are so we get an exception with bad input |
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day_of_year_type t_day_of_year(1); |
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t_day_of_year = day_of_year_type(day_of_year); |
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break; |
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} |
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case 'm': |
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{ |
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match_results mr; |
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month = fixed_string_to_int<short, charT>(sitr, stream_end, mr, 2); |
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if(month == -1) { |
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if(sv_parser.match(sitr, stream_end, mr)) { |
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return date_type(static_cast<special_values>(mr.current_match)); |
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} |
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} |
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t_month = month_type(month); |
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break; |
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} |
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case 'Y': |
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{ |
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match_results mr; |
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year = fixed_string_to_int<short, charT>(sitr, stream_end, mr, 4); |
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if(year == -1) { |
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if(sv_parser.match(sitr, stream_end, mr)) { |
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return date_type(static_cast<special_values>(mr.current_match)); |
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} |
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} |
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t_year = year_type(year); |
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break; |
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} |
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case 'y': |
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{ |
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match_results mr; |
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year = fixed_string_to_int<short, charT>(sitr, stream_end, mr, 2); |
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if(year == -1) { |
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if(sv_parser.match(sitr, stream_end, mr)) { |
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return date_type(static_cast<special_values>(mr.current_match)); |
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} |
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} |
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year += 2000; //make 2 digit years in this century |
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t_year = year_type(year); |
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break; |
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} |
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default: |
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{} //ignore those we don't understand |
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|
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}//switch |
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|
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} |
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else { // itr == '%', second consecutive |
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sitr++; |
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} |
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|
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itr++; //advance past format specifier |
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} |
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else { //skip past chars in format and in buffer |
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itr++; |
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if (use_current_char) { |
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use_current_char = false; |
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current_char = *sitr; |
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} |
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else { |
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sitr++; |
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} |
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} |
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} |
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|
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if (day_of_year > 0) { |
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date_type d(static_cast<unsigned short>(year-1),12,31); //end of prior year |
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return d + duration_type(day_of_year); |
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} |
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|
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return date_type(t_year, t_month, t_day); // exceptions were thrown earlier |
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// if input was no good |
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} |
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//! Throws bad_month if unable to parse |
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month_type |
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parse_month(std::istreambuf_iterator<charT>& sitr, |
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std::istreambuf_iterator<charT>& stream_end, |
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string_type format_str) const |
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{ |
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match_results mr; |
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return parse_month(sitr, stream_end, format_str, mr); |
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} |
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|
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//! Throws bad_month if unable to parse |
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month_type |
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parse_month(std::istreambuf_iterator<charT>& sitr, |
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std::istreambuf_iterator<charT>& stream_end, |
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string_type format_str, |
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match_results& mr) const |
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{ |
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bool use_current_char = false; |
|
|
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// skip leading whitespace |
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while(std::isspace(*sitr) && sitr != stream_end) { ++sitr; } |
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charT current_char = *sitr; |
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|
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short month(0); |
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|
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const_itr itr(format_str.begin()); |
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while (itr != format_str.end() && (sitr != stream_end)) { |
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if (*itr == '%') { |
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itr++; |
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if (*itr != '%') { |
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switch(*itr) { |
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case 'b': |
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{ |
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mr = m_month_short_names.match(sitr, stream_end); |
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month = mr.current_match; |
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if (mr.has_remaining()) { |
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current_char = mr.last_char(); |
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use_current_char = true; |
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} |
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break; |
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} |
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case 'B': |
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{ |
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mr = m_month_long_names.match(sitr, stream_end); |
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month = mr.current_match; |
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if (mr.has_remaining()) { |
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current_char = mr.last_char(); |
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use_current_char = true; |
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} |
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break; |
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} |
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case 'm': |
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{ |
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month = var_string_to_int<short, charT>(sitr, stream_end, 2); |
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// var_string_to_int returns -1 if parse failed. That will |
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// cause a bad_month exception to be thrown so we do nothing here |
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break; |
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} |
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default: |
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{} //ignore those we don't understand |
|
|
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}//switch |
|
|
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} |
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else { // itr == '%', second consecutive |
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sitr++; |
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} |
|
|
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itr++; //advance past format specifier |
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} |
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else { //skip past chars in format and in buffer |
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itr++; |
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if (use_current_char) { |
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use_current_char = false; |
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current_char = *sitr; |
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} |
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else { |
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sitr++; |
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} |
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} |
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} |
|
|
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return month_type(month); // throws bad_month exception when values are zero |
|
} |
|
|
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//! Expects 1 or 2 digits 1-31. Throws bad_day_of_month if unable to parse |
|
day_type |
|
parse_var_day_of_month(std::istreambuf_iterator<charT>& sitr, |
|
std::istreambuf_iterator<charT>& stream_end) const |
|
{ |
|
// skip leading whitespace |
|
while(std::isspace(*sitr) && sitr != stream_end) { ++sitr; } |
|
|
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return day_type(var_string_to_int<short, charT>(sitr, stream_end, 2)); |
|
} |
|
//! Expects 2 digits 01-31. Throws bad_day_of_month if unable to parse |
|
day_type |
|
parse_day_of_month(std::istreambuf_iterator<charT>& sitr, |
|
std::istreambuf_iterator<charT>& stream_end) const |
|
{ |
|
// skip leading whitespace |
|
while(std::isspace(*sitr) && sitr != stream_end) { ++sitr; } |
|
|
|
//return day_type(var_string_to_int<short, charT>(sitr, stream_end, 2)); |
|
match_results mr; |
|
return day_type(fixed_string_to_int<short, charT>(sitr, stream_end, mr, 2)); |
|
} |
|
|
|
day_of_week_type |
|
parse_weekday(std::istreambuf_iterator<charT>& sitr, |
|
std::istreambuf_iterator<charT>& stream_end, |
|
string_type format_str) const |
|
{ |
|
match_results mr; |
|
return parse_weekday(sitr, stream_end, format_str, mr); |
|
} |
|
day_of_week_type |
|
parse_weekday(std::istreambuf_iterator<charT>& sitr, |
|
std::istreambuf_iterator<charT>& stream_end, |
|
string_type format_str, |
|
match_results& mr) const |
|
{ |
|
bool use_current_char = false; |
|
|
|
// skip leading whitespace |
|
while(std::isspace(*sitr) && sitr != stream_end) { ++sitr; } |
|
charT current_char = *sitr; |
|
|
|
short wkday(0); |
|
|
|
const_itr itr(format_str.begin()); |
|
while (itr != format_str.end() && (sitr != stream_end)) { |
|
if (*itr == '%') { |
|
itr++; |
|
if (*itr != '%') { |
|
switch(*itr) { |
|
case 'a': |
|
{ |
|
//this value is just throw away. It could be used for |
|
//error checking potentially, but it isn't helpful in |
|
//actually constructing the date - we just need to get it |
|
//out of the stream |
|
mr = m_weekday_short_names.match(sitr, stream_end); |
|
wkday = mr.current_match; |
|
if (mr.has_remaining()) { |
|
current_char = mr.last_char(); |
|
use_current_char = true; |
|
} |
|
break; |
|
} |
|
case 'A': |
|
{ |
|
//this value is just throw away. It could be used for |
|
//error checking potentially, but it isn't helpful in |
|
//actually constructing the date - we just need to get it |
|
//out of the stream |
|
mr = m_weekday_long_names.match(sitr, stream_end); |
|
wkday = mr.current_match; |
|
if (mr.has_remaining()) { |
|
current_char = mr.last_char(); |
|
use_current_char = true; |
|
} |
|
break; |
|
} |
|
case 'w': |
|
{ |
|
// weekday as number 0-6, Sunday == 0 |
|
wkday = var_string_to_int<short, charT>(sitr, stream_end, 2); |
|
break; |
|
} |
|
default: |
|
{} //ignore those we don't understand |
|
|
|
}//switch |
|
|
|
} |
|
else { // itr == '%', second consecutive |
|
sitr++; |
|
} |
|
|
|
itr++; //advance past format specifier |
|
} |
|
else { //skip past chars in format and in buffer |
|
itr++; |
|
if (use_current_char) { |
|
use_current_char = false; |
|
current_char = *sitr; |
|
} |
|
else { |
|
sitr++; |
|
} |
|
} |
|
} |
|
|
|
return day_of_week_type(wkday); // throws bad_day_of_month exception |
|
// when values are zero |
|
} |
|
|
|
//! throws bad_year if unable to parse |
|
year_type |
|
parse_year(std::istreambuf_iterator<charT>& sitr, |
|
std::istreambuf_iterator<charT>& stream_end, |
|
string_type format_str) const |
|
{ |
|
match_results mr; |
|
return parse_year(sitr, stream_end, format_str, mr); |
|
} |
|
|
|
//! throws bad_year if unable to parse |
|
year_type |
|
parse_year(std::istreambuf_iterator<charT>& sitr, |
|
std::istreambuf_iterator<charT>& stream_end, |
|
string_type format_str, |
|
match_results& mr) const |
|
{ |
|
bool use_current_char = false; |
|
|
|
// skip leading whitespace |
|
while(std::isspace(*sitr) && sitr != stream_end) { ++sitr; } |
|
charT current_char = *sitr; |
|
|
|
unsigned short year(0); |
|
|
|
const_itr itr(format_str.begin()); |
|
while (itr != format_str.end() && (sitr != stream_end)) { |
|
if (*itr == '%') { |
|
itr++; |
|
if (*itr != '%') { |
|
//match_results mr; |
|
switch(*itr) { |
|
case 'Y': |
|
{ |
|
// year from 4 digit string |
|
year = fixed_string_to_int<short, charT>(sitr, stream_end, mr, 4); |
|
break; |
|
} |
|
case 'y': |
|
{ |
|
// year from 2 digit string (no century) |
|
year = fixed_string_to_int<short, charT>(sitr, stream_end, mr, 2); |
|
year += 2000; //make 2 digit years in this century |
|
break; |
|
} |
|
default: |
|
{} //ignore those we don't understand |
|
|
|
}//switch |
|
|
|
} |
|
else { // itr == '%', second consecutive |
|
sitr++; |
|
} |
|
|
|
itr++; //advance past format specifier |
|
} |
|
else { //skip past chars in format and in buffer |
|
itr++; |
|
if (use_current_char) { |
|
use_current_char = false; |
|
current_char = *sitr; |
|
} |
|
else { |
|
sitr++; |
|
} |
|
} |
|
} |
|
|
|
return year_type(year); // throws bad_year exception when values are zero |
|
} |
|
|
|
|
|
private: |
|
string_type m_format; |
|
parse_tree_type m_month_short_names; |
|
parse_tree_type m_month_long_names; |
|
parse_tree_type m_weekday_short_names; |
|
parse_tree_type m_weekday_long_names; |
|
|
|
}; |
|
|
|
} } //namespace |
|
|
|
#endif |
|
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