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