JSON (read javascript serialization) support about rrule

[coolaj86]

To give some context:

What I need this for is to determine the previous, current, and next times at which an event will happen. I'll have an array of objects and I'll parse each one with RRule and add a count just so I can get the current and next events.

[jkbrzt]

Have you considered RRule::toString() / RRule::fromString()?

https://github.com/jkbr/rrule#icalendar-rfc-string-methods

var rule = new RRule({
    freq: RRule.WEEKLY,
    interval: 5,
    byweekday: [RRule.MO, RRule.FR],
    dtstart: new Date(2012, 1, 1, 10, 30),
    until: new Date(2012, 12, 31)
});

var rfcString  = rule.toString()
// => "FREQ=WEEKLY;DTSTART=20120201T093000Z;INTERVAL=5;UNTIL=20130130T230000Z;BYDAY=MO,FR"

var rule2 = RRule.fromString(rfcString);

[coolaj86]

I suppose I could write something that converts JSON to the rfcString and another something that converts from rfcString to JSON... but I feel like that is probably a significant amount of work and understanding of the spec to get right.

I definitely need plain-old JSON so that as the thing being passed around in other parts of the user interface as well as the backend I can change the behavior of aspects of the program based on the event and it's schedule.

[coolaj86]

Actually, assuming that the left-hand column of https://github.com/jkbr/rrule#api translates directly into UPPERCASE keys in the iCal key/value pairs, parsing and stringifying the rfcString may be rather straightforward.

[jkbrzt]

You can easily convert the native RFC RRULE string to a plain JS object via RRule.parseString(rfcString):

options = RRule.parseString('FREQ=DAILY;INTERVAL=6')
// => {freq: 3, interval: 6}

and vice versa via RRule.optionsToString(options):

RRule.optionsToString(options)
// => "FREQ=DAILY;INTERVAL=6"