kristw commented on a change in pull request #5785: Handle "ambiguous durations"
URL:
https://github.com/apache/incubator-superset/pull/5785#discussion_r214379954
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File path: superset/assets/src/modules/time.js
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@@ -1,38 +1,155 @@
import parseIsoDuration from 'parse-iso-duration';
+export class IsoDuration {
+ /*
+ * Class that handles ambiguous durations like `P1M` or `P1Y`.
+ */
+
+ constructor(isoDuration) {
+ this.isoDuration = isoDuration;
+
+ // special cases not handled by parse-iso-duration
+ this.pattern = /P(\d+)(M|Y)/;
+
+ this.addTo = this.addTo.bind(this);
+ this.subtractFrom = this.subtractFrom.bind(this);
+ this.operateOn = this.operateOn.bind(this);
+ this.truncate = this.truncate.bind(this);
+ this.explode = this.explode.bind(this);
+ }
+
+ addTo(timestamp) {
+ const op = (a, b) => a + b;
+ return this.operateOn(op, timestamp);
+ }
+
+ subtractFrom(timestamp) {
+ const op = (a, b) => a - b;
+ return this.operateOn(op, timestamp);
+ }
+
+ operateOn(op, timestamp) {
+ try {
+ return op(timestamp, parseIsoDuration(this.isoDuration));
+ } catch (error) {
+ const match = this.pattern.exec(this.isoDuration);
+ if (match === null) {
+ throw error;
+ }
+ const n = parseInt(match[1], 10); // how many months or years
+
+ const date = new Date(timestamp);
+ let year = date.getFullYear();
+ let month = date.getMonth();
+
+ if (match[2] === 'M') {
+ year = op(year, Math.floor(n / 12));
+ month = op(month, (n % 12));
+ if (month < 0 || month > 11) {
+ month = op(month, -12);
+ year = op(year, 1);
+ }
+ } else if (match[2] === 'Y') {
+ year = op(year, n);
+ } else {
+ throw error; // should never happen
+ }
+ date.setFullYear(year);
+ date.setMonth(month);
+ return date.getTime();
+ }
+ }
+
+ explode(timestamp) {
+ // Return year, month, day, hour, minute, second, millisecond
+ const date = new Date(timestamp);
+ return [
+ date.getFullYear(),
+ date.getMonth() + 1, // fuck Javascript
+ date.getDate(),
+ date.getHours(),
+ date.getMinutes(),
+ date.getSeconds(),
+ date.getMilliseconds(),
+ ];
+ }
+
+ truncate(timestamp) {
+ /*
+ * Truncate timestamp down to duration resolution.
+ *
+ * > const duration = new IsoDuration('PT2H'); // 2 hours
+ * > const date = new Date('2018-01-01 23:37:00').getTime();
+ * > new Date(duration.truncate(date));
+ * Mon Jan 01 2018 22:00:00 GMT
+ */
+ const lowerBound = this.subtractFrom(timestamp);
+ const explodedTimestamp = this.explode(timestamp);
+ const explodedLowerBound = this.explode(lowerBound);
+ let foundDifference = false;
+ const args = [];
+ const first = [1, 1, 1, 0, 0, 0, 0];
Review comment:
If this is a constant, please declare outside the class. Perhaps choose a
bit more descriptive name or add comment what `first` means?
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