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#include "datetime.h"
#include <ctime>
namespace ledger {
static std::time_t now = std::time(NULL);
struct std::tm * now_tm = std::localtime(&now);
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
};
static const char * formats[] = {
"%Y/%m/%d",
"%m/%d",
"%Y.%m.%d",
"%m.%d",
"%Y-%m-%d",
"%m-%d",
"%a",
"%A",
"%b",
"%B",
"%Y",
NULL
};
bool parse_date_mask(const char * date_str, struct std::tm * result)
{
for (const char ** f = formats; *f; f++) {
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) ? now_tm->tm_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(char * date_str, std::time_t * result)
{
int year = -1, month = -1, day, num = 0;
for (char * p = date_str; *p; p++) {
if (*p == '/' || *p == '-' || *p == '.') {
if (year == -1)
year = num;
else
month = num;
num = 0;
}
else if (*p < '0' || *p > '9') {
return false;
}
else {
num *= 10;
num += *p - '0';
}
}
day = num;
if (month == -1) {
month = year;
year = -1;
}
if (base == -1 || year != base_year) {
struct std::tm when;
when.tm_hour = 0;
when.tm_min = 0;
when.tm_sec = 0;
base_year = year == -1 ? now_tm->tm_year + 1900 : year;
when.tm_year = year == -1 ? now_tm->tm_year : year - 1900;
when.tm_mon = 0;
when.tm_mday = 1;
base = std::mktime(&when);
}
*result = base;
--month;
while (--month >= 0) {
*result += month_days[month] * 24 * 60 * 60;
if (month == 1 && year % 4 == 0 && year != 2000) // february in leap years
*result += 24 * 60 * 60;
}
if (--day)
*result += day * 24 * 60 * 60;
return true;
}
} // namespace ledger
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