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import { RRule, rrulestr } from 'rrule'
import {
RecurringType,
ParsedRecurring,
EventInput,
refineProps,
DateEnv,
DateRange,
DateMarker,
createDuration,
createPlugin
} from '@fullcalendar/core'
interface RRuleParsedRecurring extends ParsedRecurring {
typeData: RRule
}
const EVENT_DEF_PROPS = {
rrule: null,
duration: createDuration
}
let recurring: RecurringType = {
parse(rawEvent: EventInput, leftoverProps: any, dateEnv: DateEnv): RRuleParsedRecurring | null {
if (rawEvent.rrule != null) {
let props = refineProps(rawEvent, EVENT_DEF_PROPS, {}, leftoverProps)
let parsed = parseRRule(props.rrule, dateEnv)
if (parsed) {
return {
typeData: parsed.rrule,
allDayGuess: parsed.allDayGuess,
duration: props.duration
}
}
}
return null
},
expand(rrule: RRule, framingRange: DateRange): DateMarker[] {
// we WANT an inclusive start and in exclusive end, but the js rrule lib will only do either BOTH
// inclusive or BOTH exclusive, which is stupid: https://github.com/jakubroztocil/rrule/issues/84
// Workaround: make inclusive, which will generate extra occurences, and then trim.
return rrule.between(framingRange.start, framingRange.end, true)
.filter(function(date) {
return date.valueOf() < framingRange.end.valueOf()
})
}
}
export default createPlugin({
recurringTypes: [ recurring ]
})
function parseRRule(input, dateEnv: DateEnv) {
let allDayGuess = null
let rrule
if (typeof input === 'string') {
rrule = rrulestr(input)
} else if (typeof input === 'object' && input) { // non-null object
let refined = { ...input } // copy
if (typeof refined.dtstart === 'string') {
let dtstartMeta = dateEnv.createMarkerMeta(refined.dtstart)
if (dtstartMeta) {
refined.dtstart = dtstartMeta.marker
allDayGuess = dtstartMeta.isTimeUnspecified
} else {
delete refined.dtstart
}
}
if (typeof refined.until === 'string') {
refined.until = dateEnv.createMarker(refined.until)
}
if (refined.freq != null) {
refined.freq = convertConstant(refined.freq)
}
if (refined.wkst != null) {
refined.wkst = convertConstant(refined.wkst)
} else {
refined.wkst = (dateEnv.weekDow - 1 + 7) % 7 // convert Sunday-first to Monday-first
}
if (refined.byweekday != null) {
refined.byweekday = convertConstants(refined.byweekday) // the plural version
}
rrule = new RRule(refined)
}
if (rrule) {
return { rrule, allDayGuess }
}
return null
}
function convertConstants(input) {
if (Array.isArray(input)) {
return input.map(convertConstant)
}
return convertConstant(input)
}
function convertConstant(input) {
if (typeof input === 'string') {
return RRule[input.toUpperCase()]
}
return input
}