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