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import { DateMarker } from './marker'
import { DateEnv, DateInput } from './env'
export interface DateRangeInput {
start?: DateInput
end?: DateInput
}
export interface OpenDateRange {
start: DateMarker | null
end: DateMarker | null
}
export interface DateRange {
start: DateMarker
end: DateMarker
}
export function parseRange(input: DateRangeInput, dateEnv: DateEnv): OpenDateRange {
let start = null
let end = null
if (input.start) {
start = dateEnv.createMarker(input.start)
}
if (input.end) {
end = dateEnv.createMarker(input.end)
}
if (!start && !end) {
return null
}
if (start && end && end < start) {
return null
}
return { start, end }
}
// SIDE-EFFECT: will mutate ranges.
// Will return a new array result.
export function invertRanges(ranges: DateRange[], constraintRange: DateRange): DateRange[] {
let invertedRanges: DateRange[] = []
let start = constraintRange.start // the end of the previous range. the start of the new range
let i
let dateRange
// ranges need to be in order. required for our date-walking algorithm
ranges.sort(compareRanges)
for (i = 0; i < ranges.length; i++) {
dateRange = ranges[i]
// add the span of time before the event (if there is any)
if (dateRange.start > start) { // compare millisecond time (skip any ambig logic)
invertedRanges.push({ start, end: dateRange.start })
}
if (dateRange.end > start) {
start = dateRange.end
}
}
// add the span of time after the last event (if there is any)
if (start < constraintRange.end) { // compare millisecond time (skip any ambig logic)
invertedRanges.push({ start, end: constraintRange.end })
}
return invertedRanges
}
function compareRanges(range0: DateRange, range1: DateRange) {
return range0.start.valueOf() - range1.start.valueOf() // earlier ranges go first
}
export function intersectRanges(range0: OpenDateRange, range1: OpenDateRange): OpenDateRange {
let start = range0.start
let end = range0.end
let newRange = null
if (range1.start !== null) {
if (start === null) {
start = range1.start
} else {
start = new Date(Math.max(start.valueOf(), range1.start.valueOf()))
}
}
if (range1.end != null) {
if (end === null) {
end = range1.end
} else {
end = new Date(Math.min(end.valueOf(), range1.end.valueOf()))
}
}
if (start === null || end === null || start < end) {
newRange = { start, end }
}
return newRange
}
export function rangesEqual(range0: OpenDateRange, range1: OpenDateRange): boolean {
return (range0.start === null ? null : range0.start.valueOf()) === (range1.start === null ? null : range1.start.valueOf()) &&
(range0.end === null ? null : range0.end.valueOf()) === (range1.end === null ? null : range1.end.valueOf())
}
export function rangesIntersect(range0: OpenDateRange, range1: OpenDateRange): boolean {
return (range0.end === null || range1.start === null || range0.end > range1.start) &&
(range0.start === null || range1.end === null || range0.start < range1.end)
}
export function rangeContainsRange(outerRange: OpenDateRange, innerRange: OpenDateRange): boolean {
return (outerRange.start === null || (innerRange.start !== null && innerRange.start >= outerRange.start)) &&
(outerRange.end === null || (innerRange.end !== null && innerRange.end <= outerRange.end))
}
export function rangeContainsMarker(range: OpenDateRange, date: DateMarker | number): boolean { // date can be a millisecond time
return (range.start === null || date >= range.start) &&
(range.end === null || date < range.end)
}
// If the given date is not within the given range, move it inside.
// (If it's past the end, make it one millisecond before the end).
export function constrainMarkerToRange(date: DateMarker, range: DateRange): DateMarker {
if (range.start != null && date < range.start) {
return range.start
}
if (range.end != null && date >= range.end) {
return new Date(range.end.valueOf() - 1)
}
return date
}