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317 lines
12 KiB
C++
317 lines
12 KiB
C++
#ifndef _DATE_TIME_DATE_PARSING_HPP___
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#define _DATE_TIME_DATE_PARSING_HPP___
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/* Copyright (c) 2002,2003,2005 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 <string>
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#include <iterator>
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#include <algorithm>
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#include <boost/tokenizer.hpp>
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#include <boost/lexical_cast.hpp>
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#include <boost/date_time/compiler_config.hpp>
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#include <boost/date_time/parse_format_base.hpp>
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#if defined(BOOST_DATE_TIME_NO_LOCALE)
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#include <cctype> // ::tolower(int)
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#else
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#include <locale> // std::tolower(char, locale)
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#endif
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namespace boost {
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namespace date_time {
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//! A function to replace the std::transform( , , ,tolower) construct
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/*! This function simply takes a string, and changes all the characters
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* in that string to lowercase (according to the default system locale).
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* In the event that a compiler does not support locales, the old
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* C style tolower() is used.
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*/
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inline
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std::string
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convert_to_lower(std::string inp)
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{
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#if !defined(BOOST_DATE_TIME_NO_LOCALE)
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const std::locale loc(std::locale::classic());
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#endif
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std::string::size_type i = 0, n = inp.length();
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for (; i < n; ++i) {
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inp[i] =
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#if defined(BOOST_DATE_TIME_NO_LOCALE)
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static_cast<char>(std::tolower(inp[i]));
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#else
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// tolower and others were brought in to std for borland >= v564
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// in compiler_config.hpp
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std::tolower(inp[i], loc);
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#endif
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}
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return inp;
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}
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//! Helper function for parse_date.
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/* Used by-value parameter because we change the string and may
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* want to preserve the original argument */
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template<class month_type>
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inline unsigned short
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month_str_to_ushort(std::string const& s) {
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if((s.at(0) >= '0') && (s.at(0) <= '9')) {
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return boost::lexical_cast<unsigned short>(s);
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}
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else {
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std::string str = convert_to_lower(s);
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typename month_type::month_map_ptr_type ptr = month_type::get_month_map_ptr();
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typename month_type::month_map_type::iterator iter = ptr->find(str);
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if(iter != ptr->end()) { // required for STLport
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return iter->second;
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}
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}
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return 13; // intentionally out of range - name not found
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}
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//! Find index of a string in either of 2 arrays
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/*! find_match searches both arrays for a match to 's'. Both arrays
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* must contain 'size' elements. The index of the match is returned.
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* If no match is found, 'size' is returned.
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* Ex. "Jan" returns 0, "Dec" returns 11, "Tue" returns 2.
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* 'size' can be sent in with: (greg_month::max)() (which 12),
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* (greg_weekday::max)() + 1 (which is 7) or date_time::NumSpecialValues */
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template<class charT>
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short find_match(const charT* const* short_names,
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const charT* const* long_names,
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short size,
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const std::basic_string<charT>& s) {
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for(short i = 0; i < size; ++i){
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if(short_names[i] == s || long_names[i] == s){
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return i;
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}
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}
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return size; // not-found, return a value out of range
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}
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//! Generic function to parse a delimited date (eg: 2002-02-10)
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/*! Accepted formats are: "2003-02-10" or " 2003-Feb-10" or
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* "2003-Feburary-10"
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* The order in which the Month, Day, & Year appear in the argument
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* string can be accomodated by passing in the appropriate ymd_order_spec
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*/
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template<class date_type>
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date_type
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parse_date(const std::string& s, int order_spec = ymd_order_iso) {
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std::string spec_str;
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if(order_spec == ymd_order_iso) {
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spec_str = "ymd";
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}
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else if(order_spec == ymd_order_dmy) {
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spec_str = "dmy";
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}
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else { // (order_spec == ymd_order_us)
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spec_str = "mdy";
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}
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typedef typename date_type::month_type month_type;
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unsigned pos = 0;
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unsigned short year(0), month(0), day(0);
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typedef typename std::basic_string<char>::traits_type traits_type;
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typedef boost::char_separator<char, traits_type> char_separator_type;
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typedef boost::tokenizer<char_separator_type,
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std::basic_string<char>::const_iterator,
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std::basic_string<char> > tokenizer;
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typedef boost::tokenizer<char_separator_type,
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std::basic_string<char>::const_iterator,
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std::basic_string<char> >::iterator tokenizer_iterator;
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// may need more delimiters, these work for the regression tests
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const char sep_char[] = {',','-','.',' ','/','\0'};
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char_separator_type sep(sep_char);
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tokenizer tok(s,sep);
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for(tokenizer_iterator beg=tok.begin();
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beg!=tok.end() && pos < spec_str.size();
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++beg, ++pos) {
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switch(spec_str.at(pos)) {
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case 'y':
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{
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year = boost::lexical_cast<unsigned short>(*beg);
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break;
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}
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case 'm':
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{
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month = month_str_to_ushort<month_type>(*beg);
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break;
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}
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case 'd':
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{
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day = boost::lexical_cast<unsigned short>(*beg);
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break;
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}
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default: break;
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} //switch
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}
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return date_type(year, month, day);
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}
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//! Generic function to parse undelimited date (eg: 20020201)
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template<class date_type>
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date_type
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parse_undelimited_date(const std::string& s) {
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int offsets[] = {4,2,2};
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int pos = 0;
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//typename date_type::ymd_type ymd((year_type::min)(),1,1);
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unsigned short y = 0, m = 0, d = 0;
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/* The two bool arguments state that parsing will not wrap
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* (only the first 8 characters will be parsed) and partial
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* strings will not be parsed.
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* Ex:
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* "2005121" will parse 2005 & 12, but not the "1" */
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boost::offset_separator osf(offsets, offsets+3, false, false);
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typedef typename boost::tokenizer<boost::offset_separator,
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std::basic_string<char>::const_iterator,
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std::basic_string<char> > tokenizer_type;
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tokenizer_type tok(s, osf);
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for(typename tokenizer_type::iterator ti=tok.begin(); ti!=tok.end();++ti) {
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unsigned short i = boost::lexical_cast<unsigned short>(*ti);
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switch(pos) {
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case 0: y = i; break;
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case 1: m = i; break;
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case 2: d = i; break;
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default: break;
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}
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pos++;
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}
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return date_type(y,m,d);
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}
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//! Helper function for 'date gregorian::from_stream()'
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/*! Creates a string from the iterators that reference the
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* begining & end of a char[] or string. All elements are
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* used in output string */
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template<class date_type, class iterator_type>
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inline
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date_type
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from_stream_type(iterator_type& beg,
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iterator_type const& end,
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char)
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{
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std::ostringstream ss;
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while(beg != end) {
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ss << *beg++;
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}
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return parse_date<date_type>(ss.str());
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}
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//! Helper function for 'date gregorian::from_stream()'
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/*! Returns the first string found in the stream referenced by the
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* begining & end iterators */
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template<class date_type, class iterator_type>
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inline
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date_type
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from_stream_type(iterator_type& beg,
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iterator_type const& /* end */,
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std::string const&)
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{
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return parse_date<date_type>(*beg);
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}
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/* I believe the wchar stuff would be best elsewhere, perhaps in
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* parse_date<>()? In the mean time this gets us started... */
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//! Helper function for 'date gregorian::from_stream()'
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/*! Creates a string from the iterators that reference the
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* begining & end of a wstring. All elements are
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* used in output string */
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template<class date_type, class iterator_type>
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inline
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date_type from_stream_type(iterator_type& beg,
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iterator_type const& end,
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wchar_t)
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{
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std::ostringstream ss;
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#if !defined(BOOST_DATE_TIME_NO_LOCALE)
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std::locale loc;
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std::ctype<wchar_t> const& fac = std::use_facet<std::ctype<wchar_t> >(loc);
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while(beg != end) {
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ss << fac.narrow(*beg++, 'X'); // 'X' will cause exception to be thrown
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}
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#else
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while(beg != end) {
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char c = 'X'; // 'X' will cause exception to be thrown
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const wchar_t wc = *beg++;
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if (wc >= 0 && wc <= 127)
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c = static_cast< char >(wc);
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ss << c;
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}
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#endif
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return parse_date<date_type>(ss.str());
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}
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#ifndef BOOST_NO_STD_WSTRING
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//! Helper function for 'date gregorian::from_stream()'
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/*! Creates a string from the first wstring found in the stream
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* referenced by the begining & end iterators */
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template<class date_type, class iterator_type>
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inline
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date_type
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from_stream_type(iterator_type& beg,
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iterator_type const& /* end */,
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std::wstring const&) {
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std::wstring ws = *beg;
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std::ostringstream ss;
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std::wstring::iterator wsb = ws.begin(), wse = ws.end();
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#if !defined(BOOST_DATE_TIME_NO_LOCALE)
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std::locale loc;
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std::ctype<wchar_t> const& fac = std::use_facet<std::ctype<wchar_t> >(loc);
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while(wsb != wse) {
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ss << fac.narrow(*wsb++, 'X'); // 'X' will cause exception to be thrown
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}
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#else
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while(wsb != wse) {
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char c = 'X'; // 'X' will cause exception to be thrown
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const wchar_t wc = *wsb++;
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if (wc >= 0 && wc <= 127)
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c = static_cast< char >(wc);
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ss << c;
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}
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#endif
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return parse_date<date_type>(ss.str());
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}
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#endif // BOOST_NO_STD_WSTRING
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#if (defined(BOOST_MSVC) && (_MSC_VER < 1300))
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// This function cannot be compiled with MSVC 6.0 due to internal compiler shorcomings
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#else
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//! function called by wrapper functions: date_period_from_(w)string()
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template<class date_type, class charT>
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period<date_type, typename date_type::duration_type>
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from_simple_string_type(const std::basic_string<charT>& s){
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typedef typename std::basic_string<charT>::traits_type traits_type;
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typedef typename boost::char_separator<charT, traits_type> char_separator;
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typedef typename boost::tokenizer<char_separator,
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typename std::basic_string<charT>::const_iterator,
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std::basic_string<charT> > tokenizer;
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const charT sep_list[4] = {'[','/',']','\0'};
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char_separator sep(sep_list);
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tokenizer tokens(s, sep);
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typename tokenizer::iterator tok_it = tokens.begin();
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std::basic_string<charT> date_string = *tok_it;
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// get 2 string iterators and generate a date from them
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typename std::basic_string<charT>::iterator date_string_start = date_string.begin(),
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date_string_end = date_string.end();
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typedef typename std::iterator_traits<typename std::basic_string<charT>::iterator>::value_type value_type;
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date_type d1 = from_stream_type<date_type>(date_string_start, date_string_end, value_type());
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date_string = *(++tok_it); // next token
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date_string_start = date_string.begin(), date_string_end = date_string.end();
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date_type d2 = from_stream_type<date_type>(date_string_start, date_string_end, value_type());
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return period<date_type, typename date_type::duration_type>(d1, d2);
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}
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#endif
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} } //namespace date_time
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#endif
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