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interval.js
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interval.js
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// Copyright 2018 - 2023 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
//
// You may obtain a copy of the License at
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// last saved: <2023-November-17 13:46:07>
//
/* jshint esversion: 9, node: true, strict: implied */
/* global process, console, Buffer, require*/
const moment = require("moment");
const _loop = Symbol("loop");
class Interval {
constructor(start, end, daily) {
this.daily = daily;
this.timeUnit = daily ? "day" : "month";
this.dateFormat = daily ? "YYYYMMDD" : "YYYYMM";
this.dateFormat2 = daily ? "YYYYMMDD" : "YYYYMMM";
if (typeof start === "string") {
const startMoment = moment(start, this.dateFormat).startOf("month");
const endMoment = end
? moment(end, this.dateFormat)
: moment(startMoment).endOf("month");
this.start = startMoment.toDate();
this.end = endMoment.toDate();
} else {
this.start = start;
this.end = end;
}
this.incrementDate = (t) => t.add(1, this.daily ? "days" : "months");
}
[_loop](fn) {
//console.log(`LOOP start: ` + moment(this.start).toString());
for (
let t = moment(this.start), end = moment(this.end), ix = 0;
t <= end;
t = this.incrementDate(t), ix++
) {
fn(t, ix);
}
}
getPeriodColumnHeads() {
// Return an array containing column heads, one for each period (month or day).
// The number of columns returned depends on the chart time period.
const format = this.daily ? "MMM DD" : "YYYY-MMM";
// daily: Each value in the array is a monthname and number: 'Mar 06'.
// monthly: each value in the array is a month and year, formatted as a string: Jan-2018
const r = [];
this[_loop]((t) => r.push(t.format(format)));
return r;
}
getRowOfZeros() {
const r = [];
this[_loop](() => r.push(0));
return r;
}
getSegments() {
const r = [];
this[_loop]((t, _ix) => {
const t1 = moment(t).endOf("month");
r.push([moment(t), t1]);
});
return r;
}
getPeriod() {
return `${moment(this.start).format(this.dateFormat2)}-${moment(this.end).format(this.dateFormat2)}`;
}
durationInDays() {
return Math.round(moment.duration(this.end.valueOf() - this.start.valueOf()).as('days'));
}
getColumnNumber(thisMoment) {
// into what column does this moment fit?
// thisMoment = milliseconds since epoch, eg output of Date.parse()
let myIndex = 0;
this[_loop]((t, ix) => {
if (thisMoment >= t) {
myIndex = ix;
}
});
return myIndex;
}
}
module.exports = Interval;