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utils.js
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utils.js
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import * as C from './constant'
const padStart = (string, length, pad) => {
const s = String(string)
if (!s || s.length >= length) return string
return `${Array((length + 1) - s.length).join(pad)}${string}`
}
const padZoneStr = (instance) => {
const negMinutes = -instance.utcOffset()
const minutes = Math.abs(negMinutes)
const hourOffset = Math.floor(minutes / 60)
const minuteOffset = minutes % 60
return `${negMinutes <= 0 ? '+' : '-'}${padStart(hourOffset, 2, '0')}:${padStart(minuteOffset, 2, '0')}`
}
const monthDiff = (a, b) => {
// function from moment.js in order to keep the same result
if (a.date() < b.date()) return -monthDiff(b, a)
const wholeMonthDiff = ((b.year() - a.year()) * 12) + (b.month() - a.month())
const anchor = a.clone().add(wholeMonthDiff, C.M)
const c = b - anchor < 0
const anchor2 = a.clone().add(wholeMonthDiff + (c ? -1 : 1), C.M)
return +(-(wholeMonthDiff + ((b - anchor) / (c ? (anchor - anchor2) :
(anchor2 - anchor)))) || 0)
}
const absFloor = n => (n < 0 ? Math.ceil(n) || 0 : Math.floor(n))
const prettyUnit = (u) => {
const special = {
M: C.M,
y: C.Y,
w: C.W,
d: C.D,
D: C.DATE,
h: C.H,
m: C.MIN,
s: C.S,
ms: C.MS,
Q: C.Q
}
return special[u] || String(u || '').toLowerCase().replace(/s$/, '')
}
const isUndefined = s => s === undefined
export default {
s: padStart,
z: padZoneStr,
m: monthDiff,
a: absFloor,
p: prettyUnit,
u: isUndefined
}