RSet supporting mixed RRule's and ExRule's

[Tam]

It would be really useful if RSet's could support having a mix of RRule's and ExRule's, where subsequent rules would override previous ones.

For example:

use RRule\RSet;

$set = new RSet();

$set->addRRule([
	'FREQ' => 'HOURLY',
	'DTSTART' => '20180404T080000Z',
	'UNTIL' => '20180405T160000Z',
]);

$set->addExRule([
	'FREQ' => 'HOURLY',
	'DTSTART' => '20180404T160000Z',
	'UNTIL' => '20180405T080000Z',
]);

$set->addRRule([
	'FREQ' => 'HOURLY',
	'DTSTART' => '20180404T180000Z',
	'UNTIL' => '20180405T020000Z',
]);

foreach ($set as $date)
	echo $date->format('r'), "\n";

Would ideally output:

Wed, 04 Apr 2018 08:00:00 +0000
Wed, 04 Apr 2018 09:00:00 +0000
Wed, 04 Apr 2018 10:00:00 +0000
Wed, 04 Apr 2018 11:00:00 +0000
Wed, 04 Apr 2018 12:00:00 +0000
Wed, 04 Apr 2018 13:00:00 +0000
Wed, 04 Apr 2018 14:00:00 +0000
Wed, 04 Apr 2018 15:00:00 +0000
Wed, 04 Apr 2018 18:00:00 +0000
Wed, 04 Apr 2018 19:00:00 +0000
Wed, 04 Apr 2018 20:00:00 +0000
Wed, 04 Apr 2018 21:00:00 +0000
Wed, 04 Apr 2018 22:00:00 +0000
Wed, 04 Apr 2018 23:00:00 +0000
Thu, 05 Apr 2018 00:00:00 +0000
Thu, 05 Apr 2018 01:00:00 +0000
Thu, 05 Apr 2018 02:00:00 +0000
Thu, 05 Apr 2018 09:00:00 +0000
Thu, 05 Apr 2018 10:00:00 +0000
Thu, 05 Apr 2018 11:00:00 +0000
Thu, 05 Apr 2018 12:00:00 +0000
Thu, 05 Apr 2018 13:00:00 +0000
Thu, 05 Apr 2018 14:00:00 +0000
Thu, 05 Apr 2018 15:00:00 +0000
Thu, 05 Apr 2018 16:00:00 +0000

Where currently it outputs:

Wed, 04 Apr 2018 08:00:00 +0000
Wed, 04 Apr 2018 09:00:00 +0000
Wed, 04 Apr 2018 10:00:00 +0000
Wed, 04 Apr 2018 11:00:00 +0000
Wed, 04 Apr 2018 12:00:00 +0000
Wed, 04 Apr 2018 13:00:00 +0000
Wed, 04 Apr 2018 14:00:00 +0000
Wed, 04 Apr 2018 15:00:00 +0000
Thu, 05 Apr 2018 09:00:00 +0000
Thu, 05 Apr 2018 10:00:00 +0000
Thu, 05 Apr 2018 11:00:00 +0000
Thu, 05 Apr 2018 12:00:00 +0000
Thu, 05 Apr 2018 13:00:00 +0000
Thu, 05 Apr 2018 14:00:00 +0000
Thu, 05 Apr 2018 15:00:00 +0000
Thu, 05 Apr 2018 16:00:00 +0000

The difference:

Wed, 04 Apr 2018 08:00:00 +0000
Wed, 04 Apr 2018 09:00:00 +0000
Wed, 04 Apr 2018 10:00:00 +0000
Wed, 04 Apr 2018 11:00:00 +0000
Wed, 04 Apr 2018 12:00:00 +0000
Wed, 04 Apr 2018 13:00:00 +0000
Wed, 04 Apr 2018 14:00:00 +0000
Wed, 04 Apr 2018 15:00:00 +0000
- Wed, 04 Apr 2018 18:00:00 +0000
- Wed, 04 Apr 2018 19:00:00 +0000
- Wed, 04 Apr 2018 20:00:00 +0000
- Wed, 04 Apr 2018 21:00:00 +0000
- Wed, 04 Apr 2018 22:00:00 +0000
- Wed, 04 Apr 2018 23:00:00 +0000
- Thu, 05 Apr 2018 00:00:00 +0000
- Thu, 05 Apr 2018 01:00:00 +0000
- Thu, 05 Apr 2018 02:00:00 +0000
Thu, 05 Apr 2018 09:00:00 +0000
Thu, 05 Apr 2018 10:00:00 +0000
Thu, 05 Apr 2018 11:00:00 +0000
Thu, 05 Apr 2018 12:00:00 +0000
Thu, 05 Apr 2018 13:00:00 +0000
Thu, 05 Apr 2018 14:00:00 +0000
Thu, 05 Apr 2018 15:00:00 +0000
Thu, 05 Apr 2018 16:00:00 +0000

I'm not sure how inline this is with the spec, but it would definitely be a useful feature for advanced event generation.

[rlanvin]

Well I have good news for you, it's already possible - albeit, as you mentioned, absolutely not supported by the spec (but then again, the whole RSet deviate from the spec quite a bit anyway).

$set = new RSet();

$subset = new RSet();
$subset->addRRule([
	'FREQ' => 'HOURLY',
	'DTSTART' => '20180404T080000Z',
	'UNTIL' => '20180405T160000Z',
]);

$subset->addExRule([
	'FREQ' => 'HOURLY',
	'DTSTART' => '20180404T160000Z',
	'UNTIL' => '20180405T080000Z',
]);

$set->addRRule([
	'FREQ' => 'HOURLY',
	'DTSTART' => '20180404T180000Z',
	'UNTIL' => '20180405T020000Z',
]);
$set->addRRule($subset);

foreach ($set as $date) {
	echo $date->format('r'), "\n";
}

[Tam]

Awesome!