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Diffstat (limited to 'boost/chrono/io/time_point_get.hpp')
| -rw-r--r-- | boost/chrono/io/time_point_get.hpp | 330 |
1 files changed, 330 insertions, 0 deletions
diff --git a/boost/chrono/io/time_point_get.hpp b/boost/chrono/io/time_point_get.hpp new file mode 100644 index 0000000000..5e4acd39cc --- /dev/null +++ b/boost/chrono/io/time_point_get.hpp @@ -0,0 +1,330 @@ +// (C) Copyright Howard Hinnant +// (C) Copyright 2011 Vicente J. Botet Escriba +// Use, modification and distribution are subject to the Boost Software License, +// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at +// http://www.boost.org/LICENSE_1_0.txt). +// + +#ifndef BOOST_CHRONO_IO_TIME_POINT_GET_HPP +#define BOOST_CHRONO_IO_TIME_POINT_GET_HPP + +#include <boost/chrono/config.hpp> +#include <boost/chrono/detail/scan_keyword.hpp> +#include <boost/chrono/io/time_point_units.hpp> +#include <boost/chrono/io/duration_get.hpp> +#include <boost/assert.hpp> +#include <locale> +#include <string> + +/** + * Duration formatting facet for input. + */ +namespace boost +{ + namespace chrono + { + + template <class CharT, class InputIterator = std::istreambuf_iterator<CharT> > + class time_point_get: public std::locale::facet + { + public: + /** + * Type of character the facet is instantiated on. + */ + typedef CharT char_type; + /** + * Type of iterator used to scan the character buffer. + */ + typedef InputIterator iter_type; + + /** + * Construct a @c time_point_get facet. + * @param refs + * @Effects Construct a @c time_point_get facet. + * If the @c refs argument is @c 0 then destruction of the object is + * delegated to the @c locale, or locales, containing it. This allows + * the user to ignore lifetime management issues. On the other had, + * if @c refs is @c 1 then the object must be explicitly deleted; + * the @c locale will not do so. In this case, the object can be + * maintained across the lifetime of multiple locales. + */ + + explicit time_point_get(size_t refs = 0) : + std::locale::facet(refs) + { + } + + /** + * @param s start input stream iterator + * @param end end input stream iterator + * @param ios a reference to a ios_base + * @param err the ios_base state + * @param d the duration + * @param pattern begin of the formatting pattern + * @param pat_end end of the formatting pattern + * + * Requires: [pattern,pat_end) shall be a valid range. + * + * Effects: The function starts by evaluating err = std::ios_base::goodbit. + * It then enters a loop, reading zero or more characters from s at + * each iteration. Unless otherwise specified below, the loop + * terminates when the first of the following conditions holds: + * - The expression pattern == pat_end evaluates to true. + * - The expression err == std::ios_base::goodbit evaluates to false. + * - The expression s == end evaluates to true, in which case the + * function evaluates err = std::ios_base::eofbit | std::ios_base::failbit. + * - The next element of pattern is equal to '%', followed by a conversion + * specifier character, the functions @c get_duration or @c get_epoch are called depending on + * whether the format is @c 'd' or @c 'e'. + * If the number of elements in the range [pattern,pat_end) is not + * sufficient to unambiguously determine whether the conversion + * specification is complete and valid, the function evaluates + * err = std::ios_base::failbit. Otherwise, the function evaluates + * s = do_get(s, end, ios, err, d). If err == std::ios_base::goodbit holds after + * the evaluation of the expression, the function increments pattern to + * point just past the end of the conversion specification and continues + * looping. + * - The expression isspace(*pattern, ios.getloc()) evaluates to true, in + * which case the function first increments pattern until + * pattern == pat_end || !isspace(*pattern, ios.getloc()) evaluates to true, + * then advances s until s == end || !isspace(*s, ios.getloc()) is true, + * and finally resumes looping. + * - The next character read from s matches the element pointed to by + * pattern in a case-insensitive comparison, in which case the function + * evaluates ++pattern, ++s and continues looping. Otherwise, the function + * evaluates err = std::ios_base::failbit. + * + * Returns: s + */ + + template <class Clock, class Duration> + iter_type get(iter_type i, iter_type e, std::ios_base& is, std::ios_base::iostate& err, + time_point<Clock, Duration> &tp, const char_type *pattern, const char_type *pat_end) const + { + if (std::has_facet<time_point_units<CharT> >(is.getloc())) + { + time_point_units<CharT> const &facet = std::use_facet<time_point_units<CharT> >(is.getloc()); + return get(facet, i, e, is, err, tp, pattern, pat_end); + } + else + { + time_point_units_default<CharT> facet; + return get(facet, i, e, is, err, tp, pattern, pat_end); + } + } + + template <class Clock, class Duration> + iter_type get(time_point_units<CharT> const &facet, iter_type s, iter_type end, std::ios_base& ios, + std::ios_base::iostate& err, time_point<Clock, Duration> &tp, const char_type *pattern, + const char_type *pat_end) const + { + + Duration d; + bool duration_found = false, epoch_found = false; + + const std::ctype<char_type>& ct = std::use_facet<std::ctype<char_type> >(ios.getloc()); + err = std::ios_base::goodbit; + while (pattern != pat_end && err == std::ios_base::goodbit) + { + if (s == end) + { + err |= std::ios_base::eofbit; + break; + } + if (ct.narrow(*pattern, 0) == '%') + { + if (++pattern == pat_end) + { + err |= std::ios_base::failbit; + return s; + } + char cmd = ct.narrow(*pattern, 0); + switch (cmd) + { + case 'd': + { + if (duration_found) + { + err |= std::ios_base::failbit; + return s; + } + duration_found = true; + s = get_duration(s, end, ios, err, d); + if (err & (std::ios_base::badbit | std::ios_base::failbit)) + { + return s; + } + break; + } + case 'e': + { + if (epoch_found) + { + err |= std::ios_base::failbit; + return s; + } + epoch_found = true; + s = get_epoch<Clock> (facet, s, end, ios, err); + if (err & (std::ios_base::badbit | std::ios_base::failbit)) + { + return s; + } + break; + } + default: + BOOST_ASSERT(false && "Boost::Chrono internal error."); + break; + } + + ++pattern; + } + else if (ct.is(std::ctype_base::space, *pattern)) + { + for (++pattern; pattern != pat_end && ct.is(std::ctype_base::space, *pattern); ++pattern) + ; + for (; s != end && ct.is(std::ctype_base::space, *s); ++s) + ; + } + else if (ct.toupper(*s) == ct.toupper(*pattern)) + { + ++s; + ++pattern; + } + else + { + err |= std::ios_base::failbit; + } + } + + // Success! Store it. + tp = time_point<Clock, Duration> (d); + return s; + } + + /** + * + * @param s an input stream iterator + * @param ios a reference to a ios_base + * @param d the duration + * Stores the duration pattern from the @c duration_unit facet in let say @c str. Last as if + * @code + * return get(s, end, ios, err, ios, d, str.data(), str.data() + str.size()); + * @codeend + * @Returns An iterator pointing just beyond the last character that can be determined to be part of a valid name + */ + template <class Clock, class Duration> + iter_type get(iter_type i, iter_type e, std::ios_base& is, std::ios_base::iostate& err, + time_point<Clock, Duration> &tp) const + { + if (std::has_facet<time_point_units<CharT> >(is.getloc())) + { + time_point_units<CharT> const &facet = std::use_facet<time_point_units<CharT> >(is.getloc()); + std::basic_string<CharT> str = facet.get_pattern(); + return get(facet, i, e, is, err, tp, str.data(), str.data() + str.size()); + } + else + { + time_point_units_default<CharT> facet; + std::basic_string<CharT> str = facet.get_pattern(); + return get(facet, i, e, is, err, tp, str.data(), str.data() + str.size()); + } + } + + /** + * As if + * @code + * return facet.get(s, end, ios, err, d); + * @endcode + * where @c facet is either the @c duration_get facet associated to the @c ios or an instance of the default @c duration_get facet. + * + * @Returns An iterator pointing just beyond the last character that can be determined to be part of a valid duration. + */ + template <typename Rep, typename Period> + iter_type get_duration(iter_type i, iter_type e, std::ios_base& is, std::ios_base::iostate& err, + duration<Rep, Period>& d) const + { + if (std::has_facet<duration_get<CharT> >(is.getloc())) + { + duration_get<CharT> const &facet = std::use_facet<duration_get<CharT> >(is.getloc()); + return get_duration(facet, i, e, is, err, d); + } + else + { + duration_get<CharT> facet; + return get_duration(facet, i, e, is, err, d); + } + } + + template <typename Rep, typename Period> + iter_type get_duration(duration_get<CharT> const& facet, iter_type s, iter_type end, std::ios_base& ios, + std::ios_base::iostate& err, duration<Rep, Period>& d) const + { + return facet.get(s, end, ios, err, d); + } + + /** + * + * @Effects Let @c facet be the @c time_point_units facet associated to @c is or a new instance of the default @c time_point_units_default facet. + * Let @c epoch be the epoch string associated to the Clock using this facet. + * Scans @c i to match @c epoch or @c e is reached. + * + * If not match before the @c e is reached @c std::ios_base::failbit is set in @c err. + * If @c e is reached @c std::ios_base::failbit is set in @c err. + * + * @Returns An iterator pointing just beyond the last character that can be determined to be part of a valid epoch. + */ + template <class Clock> + iter_type get_epoch(iter_type i, iter_type e, std::ios_base& is, std::ios_base::iostate& err) const + { + if (std::has_facet<time_point_units<CharT> >(is.getloc())) + { + time_point_units<CharT> const &facet = std::use_facet<time_point_units<CharT> >(is.getloc()); + return get_epoch(facet, i, e, is, err); + } + else + { + time_point_units_default<CharT> facet; + return get_epoch(facet, i, e, is, err); + } + } + + template <class Clock> + iter_type get_epoch(time_point_units<CharT> const &facet, iter_type i, iter_type e, std::ios_base&, + std::ios_base::iostate& err) const + { + const std::basic_string<CharT> epoch = facet.template get_epoch<Clock> (); + std::ptrdiff_t k = chrono_detail::scan_keyword(i, e, &epoch, &epoch + 1, + //~ std::use_facet<std::ctype<CharT> >(ios.getloc()), + err) - &epoch; + if (k == 1) + { + err |= std::ios_base::failbit; + return i; + } + return i; + } + + /** + * Unique identifier for this type of facet. + */ + static std::locale::id id; + + /** + * @Effects Destroy the facet + */ + ~time_point_get() + { + } + }; + + /** + * Unique identifier for this type of facet. + */ + template <class CharT, class InputIterator> + std::locale::id time_point_get<CharT, InputIterator>::id; + + } // chrono +} +// boost + +#endif // header |