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<?php
namespace Illuminate\Support;
class NamespacedItemResolver
{
/**
* A cache of the parsed items.
*
* @var array
*/
protected $parsed = [];
/**
* Parse a key into namespace, group, and item.
*
* @param string $key
* @return array
*/
public function parseKey($key)
{
// If we've already parsed the given key, we'll return the cached version we
// already have, as this will save us some processing. We cache off every
// key we parse so we can quickly return it on all subsequent requests.
if (isset($this->parsed[$key])) {
return $this->parsed[$key];
}
// If the key does not contain a double colon, it means the key is not in a
// namespace, and is just a regular configuration item. Namespaces are a
// tool for organizing configuration items for things such as modules.
if (! str_contains($key, '::')) {
$segments = explode('.', $key);
$parsed = $this->parseBasicSegments($segments);
} else {
$parsed = $this->parseNamespacedSegments($key);
}
// Once we have the parsed array of this key's elements, such as its groups
// and namespace, we will cache each array inside a simple list that has
// the key and the parsed array for quick look-ups for later requests.
return $this->parsed[$key] = $parsed;
}
/**
* Parse an array of basic segments.
*
* @param array $segments
* @return array
*/
protected function parseBasicSegments(array $segments)
{
// The first segment in a basic array will always be the group, so we can go
// ahead and grab that segment. If there is only one total segment we are
// just pulling an entire group out of the array and not a single item.
$group = $segments[0];
// If there is more than one segment in this group, it means we are pulling
// a specific item out of a group and will need to return this item name
// as well as the group so we know which item to pull from the arrays.
$item = count($segments) === 1
? null
: implode('.', array_slice($segments, 1));
return [null, $group, $item];
}
/**
* Parse an array of namespaced segments.
*
* @param string $key
* @return array
*/
protected function parseNamespacedSegments($key)
{
[$namespace, $item] = explode('::', $key);
// First we'll just explode the first segment to get the namespace and group
// since the item should be in the remaining segments. Once we have these
// two pieces of data we can proceed with parsing out the item's value.
$itemSegments = explode('.', $item);
$groupAndItem = array_slice(
$this->parseBasicSegments($itemSegments), 1
);
return array_merge([$namespace], $groupAndItem);
}
/**
* Set the parsed value of a key.
*
* @param string $key
* @param array $parsed
* @return void
*/
public function setParsedKey($key, $parsed)
{
$this->parsed[$key] = $parsed;
}
/**
* Flush the cache of parsed keys.
*
* @return void
*/
public function flushParsedKeys()
{
$this->parsed = [];
}
}
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