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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include <iomanip>
#include <sstream>
#include "iso_8601.h"
#include "include/timegm.h"
#include "include/ceph_assert.h"
namespace ceph {
using std::chrono::duration_cast;
using std::chrono::nanoseconds;
using std::chrono::seconds;
using std::setw;
using std::size_t;
using std::stringstream;
using std::string;
using std::uint16_t;
using boost::none;
using boost::optional;
using std::string_view;
using ceph::real_clock;
using ceph::real_time;
using sriter = string_view::const_iterator;
namespace {
// This assumes a contiguous block of numbers in the correct order.
uint16_t digit(char c) {
if (!(c >= '0' && c <= '9')) {
throw std::invalid_argument("Not a digit.");
}
return static_cast<uint16_t>(c - '0');
}
optional<real_time> calculate(const tm& t, uint32_t n = 0) {
ceph_assert(n < 1000000000);
time_t tt = internal_timegm(&t);
if (tt == static_cast<time_t>(-1)) {
return none;
}
return boost::make_optional<real_time>(real_clock::from_time_t(tt)
+ nanoseconds(n));
}
}
optional<real_time> from_iso_8601(const string_view s,
const bool ws_terminates) noexcept {
auto end = s.cend();
auto read_digit = [end](sriter& c) mutable {
if (c == end) {
throw std::invalid_argument("End of input.");
}
auto f = digit(*c);
++c;
return f;
};
auto read_digits = [&read_digit](sriter& c, std::size_t n) {
auto v = 0ULL;
for (auto i = 0U; i < n; ++i) {
auto d = read_digit(c);
v = (10ULL * v) + d;
}
return v;
};
auto partial_date = [end, ws_terminates](sriter& c) {
return (c == end || (ws_terminates && std::isspace(*c)));
};
auto time_end = [end, ws_terminates](sriter& c) {
return (c != end && *c == 'Z' &&
((c + 1) == end ||
(ws_terminates && std::isspace(*(c + 1)))));
};
auto consume_delimiter = [end](sriter& c, char q) {
if (c == end || *c != q) {
throw std::invalid_argument("Expected delimiter not found.");
} else {
++c;
}
};
tm t = { 0, // tm_sec
0, // tm_min
0, // tm_hour
1, // tm_mday
0, // tm_mon
70, // tm_year
0, // tm_wday
0, // tm_yday
0, // tm_isdst
};
try {
auto c = s.cbegin();
{
auto y = read_digits(c, 4);
if (y < 1970) {
return none;
}
t.tm_year = y - 1900;
}
if (partial_date(c)) {
return calculate(t, 0);
}
consume_delimiter(c, '-');
t.tm_mon = (read_digits(c, 2) - 1);
if (partial_date(c)) {
return calculate(t);
}
consume_delimiter(c, '-');
t.tm_mday = read_digits(c, 2);
if (partial_date(c)) {
return calculate(t);
}
consume_delimiter(c, 'T');
t.tm_hour = read_digits(c, 2);
if (time_end(c)) {
return calculate(t);
}
consume_delimiter(c, ':');
t.tm_min = read_digits(c, 2);
if (time_end(c)) {
return calculate(t);
}
consume_delimiter(c, ':');
t.tm_sec = read_digits(c, 2);
if (time_end(c)) {
return calculate(t);
}
consume_delimiter(c, '.');
auto n = 0UL;
auto multiplier = 100000000UL;
for (auto i = 0U; i < 9U; ++i) {
auto d = read_digit(c);
n += d * multiplier;
multiplier /= 10;
if (time_end(c)) {
return calculate(t, n);
}
}
} catch (std::invalid_argument& e) {
// fallthrough
}
return none;
}
string to_iso_8601(const real_time t,
const iso_8601_format f) noexcept {
ceph_assert(f >= iso_8601_format::Y &&
f <= iso_8601_format::YMDhmsn);
stringstream out(std::ios_base::out);
auto sec = real_clock::to_time_t(t);
auto nsec = duration_cast<nanoseconds>(t.time_since_epoch() %
seconds(1)).count();
struct tm bt;
gmtime_r(&sec, &bt);
out.fill('0');
out << 1900 + bt.tm_year;
if (f == iso_8601_format::Y) {
return out.str();
}
out << '-' << setw(2) << bt.tm_mon + 1;
if (f == iso_8601_format::YM) {
return out.str();
}
out << '-' << setw(2) << bt.tm_mday;
if (f == iso_8601_format::YMD) {
return out.str();
}
out << 'T' << setw(2) << bt.tm_hour;
if (f == iso_8601_format::YMDh) {
out << 'Z';
return out.str();
}
out << ':' << setw(2) << bt.tm_min;
if (f == iso_8601_format::YMDhm) {
out << 'Z';
return out.str();
}
out << ':' << setw(2) << bt.tm_sec;
if (f == iso_8601_format::YMDhms) {
out << 'Z';
return out.str();
}
out << '.' << setw(9) << nsec << 'Z';
return out.str();
}
}
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