/**
* Parses a formal date string.
* @param $formalDateString
* @throws \Exception
*/
public function parse($formalDateString)
{
$matches = array();
$status = preg_match(self::$FORMAL_DATE_PATTERN, $formalDateString, $matches);
if ($status === false) {
throw new \Exception("Malformed simple date string {$formalDateString}");
}
// group 1: A or R[numRepetitions]
if (isset($matches[1])) {
if ($matches[1] === "A") {
$this->isApproximate = true;
} elseif (substr($matches[1], 0, 1) === "R") {
$this->isRecurring = true;
// Group 2: numRepetitions
if (isset($matches[2]) && !empty($matches[2])) {
$this->numRepetitions = intval($matches[2]);
}
}
}
// Group 3: starting simpleDate
if (isset($matches[3]) && !empty($matches[3])) {
$this->start = new SimpleDate();
$this->start->parse($matches[3]);
}
// Group 4: "/" and ending simpleDate or duration
if (isset($matches[4])) {
$this->isRange = true;
if (isset($matches[5]) && !empty($matches[5])) {
if (substr($matches[5], 0, 1) === "P") {
if ($this->start === null) {
throw new \Exception("Error: Cannot have duration without a starting date");
}
$this->duration = new Duration();
$this->duration->parse($matches[5]);
} else {
$this->end = new SimpleDate();
$this->end->parse($matches[5]);
}
}
}
}