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export default class Month {
constructor(month, year) {
this.month = month;
this.year = year;
}
next(n) {
n = n ?? 1;
const month = this.month + n - 1;
this.month = (month % 12) + 1;
this.year += Math.floor(month / 12);
return this;
}
previous(n) {
n = n ?? 1;
let month = this.month - n - 1;
if (month < 0) {
month += 12;
}
this.month = (month % 12) + 1;
this.year += Math.floor(month / 12);
return this;
}
to(other) {
const inner = [];
const current = this.copy();
while (current.is_same(other) || current.is_before(other)) {
inner.push(current.copy());
current.next();
}
return inner;
}
copy() {
return new Month(this.month, this.year);
}
is_before(other) {
return this.year < other.year || (this.year == other.year && this.month < other.month);
}
is_after(other) {
return this.year > other.year || (this.year == other.year && this.month > other.month);
}
is_same(other) {
return this.year == other?.year && this.month == other?.month;
}
is_same_year(other) {
return this.year == other.year;
}
get name() {
const date = new Date();
date.setMonth(this.month - 1);
return date.toLocaleDateString('default', { month: 'long' })
}
static from_unix(date) {
if (date == null) return null;
return Month.from_date(new Date(date * 1000));
}
static from_date(date) {
return new Month(date.getMonth() + 1, date.getFullYear());
}
static from_string(string) {
const [ year, month ] = string.split('-');
return new Month(parseInt(month), parseInt(year))
}
static literal(strings) {
return Month.from_string(strings[0]);
}
static get current() {
return Month.from_date(new Date());
}
}
export const literal = Month.literal;
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