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