1 files changed, 161 insertions, 0 deletions
diff --git a/src/openvic2/Date.cpp b/src/openvic2/Date.cpp
new file mode 100644
index 0000000..ed800d5
--- /dev/null
+++ b/src/openvic2/Date.cpp
@@ -0,0 +1,161 @@
+#include "Date.hpp"
+
+#include <cctype>
+#include <algorithm>
+
+#include "Logger.hpp"
+
+using namespace OpenVic2;
+
+Timespan::Timespan(day_t value) : days{value} {}
+
+bool Timespan::operator<(Timespan other) const { return days < other.days; };
+bool Timespan::operator>(Timespan other) const { return days > other.days; };
+bool Timespan::operator<=(Timespan other) const { return days <= other.days; };
+bool Timespan::operator>=(Timespan other) const { return days >= other.days; };
+bool Timespan::operator==(Timespan other) const { return days == other.days; };
+bool Timespan::operator!=(Timespan other) const { return days != other.days; };
+
+Timespan Timespan::operator+(Timespan other) const { return days + other.days; }
+
+Timespan Timespan::operator-(Timespan other) const { return days - other.days; }
+
+Timespan Timespan::operator*(day_t factor) const { return days * factor; }
+
+Timespan Timespan::operator/(day_t factor) const { return days / factor; }
+
+Timespan& Timespan::operator+=(Timespan other) {
+	days += other.days;
+	return *this;
+}
+
+Timespan& Timespan::operator-=(Timespan other) {
+	days -= other.days;
+	return *this;
+}
+
+Timespan& Timespan::operator++() {
+	days++;
+	return *this;
+}
+
+Timespan Timespan::operator++(int) {
+	Timespan old = *this;
+	++(*this);
+	return old;
+}
+
+Timespan::operator day_t() const {
+	return days;
+}
+
+Timespan::operator double() const {
+	return days;
+}
+
+Timespan::operator std::string() const {
+	return std::to_string(days);
+}
+
+std::ostream& OpenVic2::operator<<(std::ostream& out, Timespan timespan) {
+	return out << static_cast<std::string>(timespan);
+}
+
+Timespan Date::_dateToTimespan(year_t year, month_t month, day_t day) {
+	month = std::clamp<month_t>(month, 1, MONTHS_IN_YEAR);
+	day = std::clamp<day_t>(day, 1, DAYS_IN_MONTH[month - 1]);
+	return year * DAYS_IN_YEAR + DAYS_UP_TO_MONTH[month - 1] + day - 1;
+}
+
+Date::Date(Timespan total_days) : timespan{ total_days } {
+	if (timespan < 0) {
+		Logger::error("Invalid timespan for date: ", timespan, " (cannot be negative)");
+		timespan = 0;
+	}
+}
+
+Date::Date(year_t year, month_t month, day_t day) : timespan{ _dateToTimespan(year, month, day) } {}
+
+Date::year_t Date::getYear() const {
+	return static_cast<Timespan::day_t>(timespan) / DAYS_IN_YEAR;
+}
+
+Date::month_t Date::getMonth() const {
+	return ((static_cast<Timespan::day_t>(timespan) % DAYS_IN_YEAR) / 32) + 1;
+}
+
+Date::day_t Date::getDay() const {
+	const Timespan::day_t days_in_year = static_cast<Timespan::day_t>(timespan) % DAYS_IN_YEAR;
+	return days_in_year - DAYS_UP_TO_MONTH[days_in_year / 32] + 1;
+}
+
+
+bool Date::operator<(Date other) const { return timespan < other.timespan; };
+bool Date::operator>(Date other) const { return timespan > other.timespan; };
+bool Date::operator<=(Date other) const { return timespan <= other.timespan; };
+bool Date::operator>=(Date other) const { return timespan >= other.timespan; };
+bool Date::operator==(Date other) const { return timespan == other.timespan; };
+bool Date::operator!=(Date other) const { return timespan != other.timespan; };
+
+Date Date::operator+(Timespan other) const { return timespan + other; }
+
+Timespan Date::operator-(Date other) const { return timespan - other.timespan; }
+
+Date& Date::operator+=(Timespan other) {
+	timespan += other;
+	return *this;
+}
+
+Date& Date::operator-=(Timespan other) {
+	timespan -= other;
+	return *this;
+}
+
+Date& Date::operator++() {
+	timespan++;
+	return *this;
+}
+
+Date Date::operator++(int) {
+	Date old = *this;
+	++(*this);
+	return old;
+}
+
+Date::operator std::string() const {
+	std::stringstream ss;
+	ss << *this;
+	return ss.str();
+}
+
+std::ostream& OpenVic2::operator<<(std::ostream& out, Date date) {
+	return out << (int) date.getYear() << '.' << (int) date.getMonth() << '.' << (int) date.getDay();
+}
+
+// Parsed from string of the form YYYY.MM.DD
+Date Date::from_string(std::string const& date) {
+	year_t year = 0;
+	month_t month = 1;
+	day_t day = 1;
+
+	size_t first_pos = 0;
+	while (first_pos < date.length() && std::isdigit(date[first_pos++]));
+	year = atoi(date.substr(0, first_pos).c_str());
+	if (first_pos < date.length()) {
+		if (date[first_pos] == '.') {
+			size_t second_pos = first_pos + 1;
+			while (second_pos < date.length() && std::isdigit(date[second_pos++]));
+			month = atoi(date.substr(first_pos, second_pos - first_pos).c_str());
+			if (second_pos < date.length()) {
+				if (date[second_pos] == '.') {
+					size_t third_pos = second_pos + 1;
+					while (third_pos < date.length() && std::isdigit(date[third_pos++]));
+					day = atoi(date.substr(second_pos, third_pos - second_pos).c_str());
+					if (third_pos < date.length())
+						Logger::error("Unexpected string \"", date.substr(third_pos), "\" at the end of date ", date);
+				} else Logger::error("Unexpected character \"", date[second_pos], "\" in date ", date);
+			}
+		} else Logger::error("Unexpected character \"", date[first_pos], "\" in date ", date);
+	}
+	return _dateToTimespan(year, month, day);
+};