348 lines
8 KiB
C++
348 lines
8 KiB
C++
#if defined(__GNUG__) && __GNUG__ < 3
|
|
#define _XOPEN_SOURCE
|
|
#endif
|
|
|
|
#include "datetime.h"
|
|
|
|
#include <ctime>
|
|
#include <cctype>
|
|
|
|
date_t date_t::now(std::time(NULL));
|
|
int date_t::current_year = date_t::now.year();
|
|
std::string date_t::input_format;
|
|
std::string date_t::output_format = "%Y/%m/%d";
|
|
|
|
const char * date_t::formats[] = {
|
|
"%Y/%m/%d",
|
|
"%m/%d",
|
|
"%Y.%m.%d",
|
|
"%m.%d",
|
|
"%Y-%m-%d",
|
|
"%m-%d",
|
|
"%a",
|
|
"%A",
|
|
"%b",
|
|
"%B",
|
|
"%Y",
|
|
NULL
|
|
};
|
|
|
|
datetime_t datetime_t::now(std::time(NULL));
|
|
|
|
namespace {
|
|
static std::time_t base = -1;
|
|
static int base_year = -1;
|
|
|
|
static const int month_days[12] = {
|
|
31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
|
|
};
|
|
|
|
bool parse_date_mask(const char * date_str, struct std::tm * result);
|
|
bool parse_date(const char * date_str, std::time_t * result,
|
|
const int year = -1);
|
|
bool quick_parse_date(const char * date_str, std::time_t * result);
|
|
}
|
|
|
|
date_t::date_t(const std::string& _when)
|
|
{
|
|
if (! quick_parse_date(_when.c_str(), &when))
|
|
throw new date_error
|
|
(std::string("Invalid date string: ") + _when);
|
|
}
|
|
|
|
datetime_t::datetime_t(const std::string& _when)
|
|
{
|
|
if (const char * p = std::strchr(_when.c_str(), ' ')) {
|
|
date_t date(std::string(_when, 0, p - _when.c_str()));
|
|
|
|
struct std::tm moment = *std::localtime(&date.when);
|
|
if (! strptime(++p, "%H:%M:%S", &moment))
|
|
throw new datetime_error
|
|
(std::string("Invalid date/time string: ") + _when);
|
|
|
|
when = std::mktime(&moment);
|
|
} else {
|
|
when = date_t(_when).when;
|
|
}
|
|
}
|
|
|
|
datetime_t interval_t::first(const datetime_t& moment) const
|
|
{
|
|
datetime_t quant(begin);
|
|
|
|
if (moment && moment > quant) {
|
|
// Find an efficient starting point for the upcoming while loop.
|
|
// We want a date early enough that the range will be correct, but
|
|
// late enough that we don't spend hundreds of thousands of loops
|
|
// skipping through time.
|
|
|
|
struct std::tm * desc = std::localtime(&moment.when);
|
|
|
|
if (years)
|
|
desc->tm_mon = 0;
|
|
desc->tm_mday = 1;
|
|
|
|
desc->tm_hour = 0;
|
|
desc->tm_min = 0;
|
|
desc->tm_sec = 0;
|
|
desc->tm_isdst = -1;
|
|
|
|
quant = std::mktime(desc);
|
|
|
|
datetime_t temp;
|
|
while (moment >= (temp = increment(quant))) {
|
|
if (quant == temp)
|
|
break;
|
|
quant = temp;
|
|
}
|
|
}
|
|
|
|
return quant;
|
|
}
|
|
|
|
datetime_t interval_t::increment(const datetime_t& moment) const
|
|
{
|
|
struct std::tm * desc = std::localtime(&moment.when);
|
|
|
|
if (years)
|
|
desc->tm_year += years;
|
|
if (months)
|
|
desc->tm_mon += months;
|
|
if (days)
|
|
desc->tm_mon += days;
|
|
|
|
desc->tm_hour += hours;
|
|
desc->tm_min += minutes;
|
|
desc->tm_sec += seconds;
|
|
|
|
desc->tm_isdst = -1;
|
|
|
|
return std::mktime(desc);
|
|
}
|
|
|
|
namespace {
|
|
void parse_inclusion_specifier(const std::string& word,
|
|
datetime_t * begin, datetime_t * end)
|
|
{
|
|
struct std::tm when;
|
|
|
|
if (! parse_date_mask(word.c_str(), &when))
|
|
throw new datetime_error(std::string("Could not parse date mask: ") + word);
|
|
|
|
when.tm_hour = 0;
|
|
when.tm_min = 0;
|
|
when.tm_sec = 0;
|
|
when.tm_isdst = -1;
|
|
|
|
bool saw_year = true;
|
|
bool saw_mon = true;
|
|
bool saw_day = true;
|
|
|
|
if (when.tm_year == -1) {
|
|
when.tm_year = date_t::current_year;
|
|
saw_year = false;
|
|
}
|
|
if (when.tm_mon == -1) {
|
|
when.tm_mon = 0;
|
|
saw_mon = false;
|
|
} else {
|
|
saw_year = false; // don't increment by year if month used
|
|
}
|
|
if (when.tm_mday == -1) {
|
|
when.tm_mday = 1;
|
|
saw_day = false;
|
|
} else {
|
|
saw_mon = false; // don't increment by month if day used
|
|
saw_year = false; // don't increment by year if day used
|
|
}
|
|
|
|
if (begin) {
|
|
*begin = std::mktime(&when);
|
|
if (end)
|
|
*end = interval_t(saw_day ? 86400 : 0, saw_mon ? 1 : 0,
|
|
saw_year ? 1 : 0).increment(*begin);
|
|
}
|
|
else if (end) {
|
|
*end = std::mktime(&when);
|
|
}
|
|
}
|
|
|
|
inline void read_lower_word(std::istream& in, std::string& word) {
|
|
in >> word;
|
|
for (int i = 0, l = word.length(); i < l; i++)
|
|
word[i] = std::tolower(word[i]);
|
|
}
|
|
|
|
void parse_date_words(std::istream& in, std::string& word,
|
|
datetime_t * begin, datetime_t * end)
|
|
{
|
|
std::string type;
|
|
|
|
bool mon_spec = false;
|
|
char buf[32];
|
|
|
|
if (word == "this" || word == "last" || word == "next") {
|
|
type = word;
|
|
if (! in.eof())
|
|
read_lower_word(in, word);
|
|
else
|
|
word = "month";
|
|
} else {
|
|
type = "this";
|
|
}
|
|
|
|
if (word == "month") {
|
|
std::strftime(buf, 31, "%B", datetime_t::now.localtime());
|
|
word = buf;
|
|
mon_spec = true;
|
|
}
|
|
else if (word == "year") {
|
|
std::strftime(buf, 31, "%Y", datetime_t::now.localtime());
|
|
word = buf;
|
|
}
|
|
|
|
parse_inclusion_specifier(word, begin, end);
|
|
|
|
if (type == "last") {
|
|
if (mon_spec) {
|
|
if (begin)
|
|
*begin = interval_t(0, -1, 0).increment(*begin);
|
|
if (end)
|
|
*end = interval_t(0, -1, 0).increment(*end);
|
|
} else {
|
|
if (begin)
|
|
*begin = interval_t(0, 0, -1).increment(*begin);
|
|
if (end)
|
|
*end = interval_t(0, 0, -1).increment(*end);
|
|
}
|
|
}
|
|
else if (type == "next") {
|
|
if (mon_spec) {
|
|
if (begin)
|
|
*begin = interval_t(0, 1, 0).increment(*begin);
|
|
if (end)
|
|
*end = interval_t(0, 1, 0).increment(*end);
|
|
} else {
|
|
if (begin)
|
|
*begin = interval_t(0, 0, 1).increment(*begin);
|
|
if (end)
|
|
*end = interval_t(0, 0, 1).increment(*end);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void interval_t::parse(std::istream& in)
|
|
{
|
|
std::string word;
|
|
|
|
while (! in.eof()) {
|
|
read_lower_word(in, word);
|
|
if (word == "every") {
|
|
read_lower_word(in, word);
|
|
if (std::isdigit(word[0])) {
|
|
int quantity = std::atol(word.c_str());
|
|
read_lower_word(in, word);
|
|
if (word == "days")
|
|
days = quantity;
|
|
else if (word == "weeks")
|
|
days = 7 * quantity;
|
|
else if (word == "months")
|
|
months = quantity;
|
|
else if (word == "quarters")
|
|
months = 3 * quantity;
|
|
else if (word == "years")
|
|
years = quantity;
|
|
}
|
|
else if (word == "day")
|
|
days = 1;
|
|
else if (word == "week")
|
|
days = 7;
|
|
else if (word == "month")
|
|
months = 1;
|
|
else if (word == "quarter")
|
|
months = 3;
|
|
else if (word == "year")
|
|
years = 1;
|
|
}
|
|
else if (word == "daily")
|
|
days = 1;
|
|
else if (word == "weekly")
|
|
days = 7;
|
|
else if (word == "biweekly")
|
|
days = 14;
|
|
else if (word == "monthly")
|
|
months = 1;
|
|
else if (word == "bimonthly")
|
|
months = 2;
|
|
else if (word == "quarterly")
|
|
months = 3;
|
|
else if (word == "yearly")
|
|
years = 1;
|
|
else if (word == "this" || word == "last" || word == "next") {
|
|
parse_date_words(in, word, &begin, &end);
|
|
}
|
|
else if (word == "in") {
|
|
read_lower_word(in, word);
|
|
parse_date_words(in, word, &begin, &end);
|
|
}
|
|
else if (word == "from" || word == "since") {
|
|
read_lower_word(in, word);
|
|
parse_date_words(in, word, &begin, NULL);
|
|
}
|
|
else if (word == "to" || word == "until") {
|
|
read_lower_word(in, word);
|
|
parse_date_words(in, word, NULL, &end);
|
|
}
|
|
else {
|
|
parse_inclusion_specifier(word, &begin, &end);
|
|
}
|
|
}
|
|
}
|
|
|
|
namespace {
|
|
bool parse_date_mask(const char * date_str, struct std::tm * result)
|
|
{
|
|
if (! date_t::input_format.empty()) {
|
|
std::memset(result, INT_MAX, sizeof(struct std::tm));
|
|
if (strptime(date_str, date_t::input_format.c_str(), result))
|
|
return true;
|
|
}
|
|
for (const char ** f = date_t::formats; *f; f++) {
|
|
std::memset(result, INT_MAX, sizeof(struct std::tm));
|
|
if (strptime(date_str, *f, result))
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool parse_date(const char * date_str, std::time_t * result, const int year)
|
|
{
|
|
struct std::tm when;
|
|
|
|
if (! parse_date_mask(date_str, &when))
|
|
return false;
|
|
|
|
when.tm_hour = 0;
|
|
when.tm_min = 0;
|
|
when.tm_sec = 0;
|
|
|
|
if (when.tm_year == -1)
|
|
when.tm_year = ((year == -1) ? date_t::current_year : (year - 1900));
|
|
|
|
if (when.tm_mon == -1)
|
|
when.tm_mon = 0;
|
|
|
|
if (when.tm_mday == -1)
|
|
when.tm_mday = 1;
|
|
|
|
*result = std::mktime(&when);
|
|
|
|
return true;
|
|
}
|
|
|
|
bool quick_parse_date(const char * date_str, std::time_t * result)
|
|
{
|
|
return parse_date(date_str, result, date_t::current_year + 1900);
|
|
}
|
|
}
|