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import { startOfDay, addDays, DateMarker } from '../datelib/marker'
import { Duration, createDuration, subtractDurations } from '../datelib/duration'
import { arrayToHash } from '../util/object'
import { refineProps } from '../util/misc'
import { RecurringType, ParsedRecurring } from './recurring-event'
import { EventInput } from './event'
import { DateRange, intersectRanges } from '../datelib/date-range'
import { DateEnv } from '../datelib/env'
import { createPlugin } from '../plugin-system'
/*
An implementation of recurring events that only supports every-day or weekly recurrences.
*/
interface SimpleRecurringData {
daysOfWeek: number[] | null
startTime: Duration | null
endTime: Duration | null
startRecur: DateMarker | null
endRecur: DateMarker | null
}
interface SimpleParsedRecurring extends ParsedRecurring {
typeData: SimpleRecurringData // the whole point is to make this more specific
}
let recurring: RecurringType = {
parse(rawEvent: EventInput, leftoverProps: any, dateEnv: DateEnv): SimpleParsedRecurring | null {
let createMarker = dateEnv.createMarker.bind(dateEnv)
let processors = {
daysOfWeek: null,
startTime: createDuration,
endTime: createDuration,
startRecur: createMarker,
endRecur: createMarker
}
let props = refineProps(rawEvent, processors, {}, leftoverProps) as SimpleRecurringData
let anyValid = false
for (let propName in props) {
if (props[propName] != null) {
anyValid = true
break
}
}
if (anyValid) {
return {
allDayGuess: Boolean(!props.startTime && !props.endTime),
duration: (props.startTime && props.endTime) ?
subtractDurations(props.endTime, props.startTime) :
null,
typeData: props // doesn't need endTime anymore but oh well
}
}
return null
},
expand(typeData: SimpleRecurringData, framingRange: DateRange, dateEnv: DateEnv): DateMarker[] {
let clippedFramingRange = intersectRanges(
framingRange,
{ start: typeData.startRecur, end: typeData.endRecur }
)
if (clippedFramingRange) {
return expandRanges(
typeData.daysOfWeek,
typeData.startTime,
clippedFramingRange,
dateEnv
)
} else {
return []
}
}
}
export default createPlugin({
recurringTypes: [ recurring ]
})
function expandRanges(
daysOfWeek: number[] | null,
startTime: Duration | null,
framingRange: DateRange,
dateEnv: DateEnv
): DateMarker[] {
let dowHash: { [num: string]: true } | null = daysOfWeek ? arrayToHash(daysOfWeek) : null
let dayMarker = startOfDay(framingRange.start)
let endMarker = framingRange.end
let instanceStarts: DateMarker[] = []
while (dayMarker < endMarker) {
let instanceStart
// if everyday, or this particular day-of-week
if (!dowHash || dowHash[dayMarker.getUTCDay()]) {
if (startTime) {
instanceStart = dateEnv.add(dayMarker, startTime)
} else {
instanceStart = dayMarker
}
instanceStarts.push(instanceStart)
}
dayMarker = addDays(dayMarker, 1)
}
return instanceStarts
}