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const t0 = new Date, t1 = new Date;
export function timeInterval(floori, offseti, count, field) {
function interval(date) {
return floori(date = arguments.length === 0 ? new Date : new Date(+date)), date;
}
interval.floor = (date) => {
return floori(date = new Date(+date)), date;
};
interval.ceil = (date) => {
return floori(date = new Date(date - 1)), offseti(date, 1), floori(date), date;
};
interval.round = (date) => {
const d0 = interval(date), d1 = interval.ceil(date);
return date - d0 < d1 - date ? d0 : d1;
};
interval.offset = (date, step) => {
return offseti(date = new Date(+date), step == null ? 1 : Math.floor(step)), date;
};
interval.range = (start, stop, step) => {
const range = [];
start = interval.ceil(start);
step = step == null ? 1 : Math.floor(step);
if (!(start < stop) || !(step > 0)) return range; // also handles Invalid Date
let previous;
do range.push(previous = new Date(+start)), offseti(start, step), floori(start);
while (previous < start && start < stop);
return range;
};
interval.filter = (test) => {
return timeInterval((date) => {
if (date >= date) while (floori(date), !test(date)) date.setTime(date - 1);
}, (date, step) => {
if (date >= date) {
if (step < 0) while (++step <= 0) {
while (offseti(date, -1), !test(date)) {} // eslint-disable-line no-empty
} else while (--step >= 0) {
while (offseti(date, +1), !test(date)) {} // eslint-disable-line no-empty
}
}
});
};
if (count) {
interval.count = (start, end) => {
t0.setTime(+start), t1.setTime(+end);
floori(t0), floori(t1);
return Math.floor(count(t0, t1));
};
interval.every = (step) => {
step = Math.floor(step);
return !isFinite(step) || !(step > 0) ? null
: !(step > 1) ? interval
: interval.filter(field
? (d) => field(d) % step === 0
: (d) => interval.count(0, d) % step === 0);
};
}
return interval;
}
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