/**
* Finds the required template by $key in $fragments and returns it if
* found.
* If the current key is not in $fragments, searches in $fallback
* (potentially recursively).
* @arg string $key The key of the template to locate. Not null.
* @return string|null The requested template, if found.
*/
private function i_findFragment($key)
{
assert($key !== null);
assert(is_string($key));
assert($this->fragments !== null);
if (array_key_exists($key, $this->fragments)) {
return $this->fragments[$key];
} else {
if (null !== $this->fallback) {
return $this->fallback->i_findFragment($key);
} else {
return null;
}
}
}
