Method parseFilter

lib/Service/VariableService.php:210–337

* parsing of %*% variables * * @param $filter * @return array|bool */

($filter)

	 * @return array|bool
	 */
	private function parseFilter($filter) {
		preg_match_all("/(?<=%).*(?=%)/", $filter, $matches);
		if (count($matches[0]) > 0) {
			$filter = $matches[0][0];
			preg_match('/(first|second|third|fourth|last|next|current|to|yester)?/', $filter, $directionMatch); // direction
			preg_match('/[0-9]+/', $filter, $offsetMatch); // how much
			preg_match('/(day|days|week|weeks|month|months|year|years|quarter|quarters)$/', $filter, $unitMatch); // unit

			if (!$directionMatch[0] || !$unitMatch[0]) {
				// no known text variables found
				return false;
			}

			// if no offset is specified, apply 1 as default
			!isset($offsetMatch[0]) ? $offset = 1 : $offset = $offsetMatch[0];

			// remove "s" to unify e.g. weeks => week
			$unit = rtrim($unitMatch[0], 's');
			$direction = strtolower($directionMatch[0]);

			if ($unit === 'quarter') {
				$currentMonth = (int)date('n');
				$currentYear = (int)date('Y');
				$currentQuarter = (int)ceil($currentMonth / 3);

				$targetQuarter = $currentQuarter;
				$targetYear = $currentYear;

				switch ($direction) {
					case 'first':
						$targetQuarter = 1;
						break;
					case 'second':
						$targetQuarter = 2;
						break;
					case 'third':
						$targetQuarter = 3;
						break;
					case 'fourth':
						$targetQuarter = 4;
						break;
					case 'last':
					case 'yester':
						$targetQuarter = $currentQuarter - $offset;
						while ($targetQuarter < 1) {
							$targetQuarter += 4;
							$targetYear -= 1;
						}
						break;
					case 'next':
						$targetQuarter = $currentQuarter + $offset;
						while ($targetQuarter > 4) {
							$targetQuarter -= 4;
							$targetYear += 1;
						}
						break;
					case 'current':
					default: