protected function findPlaceholders()
{
$data = array();
foreach ($this->data as $part) {
if (is_string($part)) {
while (preg_match('#^(.+){{([^}]+)}}(.+)$#Usi', $part, $match)) {
$data[] = $match[1];
$placeholder = new Placeholder($match[2]);
$data[] = $placeholder;
$this->placeholders[$placeholder->getName()] = $placeholder;
$part = $match[3];
}
$data[] = $part;
} else {
$data[] = $part;
}
}
$this->data = $data;
}