Period.php

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<?php

namespace Sabre\VObject\Property\ICalendar;

use Sabre\VObject\DateTimeParser;
use Sabre\VObject\Property;
use Sabre\Xml;

class Period extends Property {

    public $delimiter = ',';

    function setRawMimeDirValue($val) {

        $this->setValue(explode($this->delimiter, $val));

    }

    function getRawMimeDirValue() {

        return implode($this->delimiter, $this->getParts());

    }

    function getValueType() {

        return 'PERIOD';

    }

    function setJsonValue(array $value) {

        $value = array_map(
            function($item) {

                return strtr(implode('/', $item), [':' => '', '-' => '']);

            },
            $value
        );
        parent::setJsonValue($value);

    }

    function getJsonValue() {

        $return = [];
        foreach ($this->getParts() as $item) {

            list($start, $end) = explode('/', $item, 2);

            $start = DateTimeParser::parseDateTime($start);

            // This is a duration value.
            if ($end[0] === 'P') {
                $return[] = [
                    $start->format('Y-m-d\\TH:i:s'),
                    $end
                ];
            } else {
                $end = DateTimeParser::parseDateTime($end);
                $return[] = [
                    $start->format('Y-m-d\\TH:i:s'),
                    $end->format('Y-m-d\\TH:i:s'),
                ];
            }

        }

        return $return;

    }

    protected function xmlSerializeValue(Xml\Writer $writer) {

        $writer->startElement(strtolower($this->getValueType()));
        $value = $this->getJsonValue();
        $writer->writeElement('start', $value[0][0]);

        if ($value[0][1][0] === 'P') {
            $writer->writeElement('duration', $value[0][1]);
        }
        else {
            $writer->writeElement('end', $value[0][1]);
        }

        $writer->endElement();

    }

}