/**
* Gets the next tag after this tag
*
* For page tags, this gets the next page if there is a next page.
*
* @return PinholePageTag the next tag after this tag or null if there is
* no next tag.
*/
public function next()
{
$returned_tag = null;
switch ($this->name) {
case 'number':
$value = intval($this->value) - 1;
break;
default:
$value = null;
break;
}
if ($value !== null) {
$string = sprintf('%s.%s=%s', self::NS, $this->name, $value);
$tag = new PinholeDateTag();
if ($tag->parse($string, $this->db) !== false) {
$returned_tag = $tag;
}
}
return $returned_tag;
}
/**
* Gets the previous tag before this tag
*
* @return PinholeDateTag the previous tag before this tag or null if there
* is no previous tag.
*/
public function prev()
{
$returned_tag = null;
switch ($this->name) {
case 'date':
$date = new SwatDate($this->value);
$date->subtractDays(1);
$value = $date->formatLikeIntl('yyyy-MM-dd');
break;
case 'week':
if (ctype_digit($this->value)) {
$value = $this->value > 1 ? $this->value - 1 : null;
} else {
// beginning of previous week
$start_date = new SwatDate($this->value);
$start_date->subtractDays(7 + $start_date->getDayOfWeek());
$value = $start_date->formatLikeIntl('yyyy-MM-dd');
}
break;
case 'year':
$value = $this->value > 0 ? $this->value - 1 : null;
break;
case 'month':
$value = $this->value > 1 ? $this->value - 1 : null;
break;
case 'day':
$value = $this->value > 1 ? $this->value - 1 : null;
break;
default:
$value = null;
break;
}
if ($value !== null) {
$string = sprintf('%s.%s=%s', self::NS, $this->name, $value);
$tag = new PinholeDateTag();
if ($tag->parse($string, $this->db, $this->instance) !== false) {
$returned_tag = $tag;
}
}
return $returned_tag;
}
