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<?php |
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namespace Nayjest\Tree; |
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use Nayjest\Collection\Extended\Registry; |
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use Nayjest\Collection\Extended\RegistryInterface; |
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use Nayjest\Tree\Exception\NodeNotFoundException; |
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use Nayjest\Tree\Utils\TreeBuilder; |
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/** |
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* Class for working with tree. |
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* |
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* ==== [ RU ] ==== |
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* Класс для работы с деревом. |
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* |
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* Особенности реализации: |
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* (1) Раздельно хранит реестр именованных узлов (1-a) и конфигурацию дерева (1-b) |
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* (2) Замораживает связи между узлами, описанными в конфигурации |
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* Фичи: |
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* 1-a.1 Доступ к узлам дерева по имени [ $tree->nodes()->get('name') ] |
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* Решает задачи: |
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* * Доступ к функциональным(именованным) узлам дерева |
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* Альтернативы: |
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* * Pекурсивный поиск по свойству |
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* + есть из коробки |
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* - плохая производительность |
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* * Хранение ссылок на узлы (возможно заслуживает внимания) |
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* - нужно реализовать обновление ссылок при замене узлов |
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* Cons/Pros |
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* + Быстрее рекурсивного поиска |
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* + Поиск ограничивается реестром, что исключает конфликты имен с элементами нижележащих деревьев |
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* - сложнее реализация (рекурсивный поиск есть из коробки) |
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* 1-a.2 Можно определить функциональную принадлежность узла конкретному дереву |
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* 1-b.1 Позволяет заменить функциональный узел с сохранением функционвльных потомков |
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* 2. Выборочное замораживание структуры дерева |
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* Решает проблему: |
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* Поддержка целосности структуры, однозначность операций т. к. открыто 2 API для модификации дерева |
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* ситуации: |
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* * узел удален из дерева через node api, но остался в $hierarchy: после $tree->update() он опять туда попадет |
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* * через api узлов можно сломать структуру, ожидаемую от дерева, т. е. нельзя завязаться на уонкретное дерево |
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* Альтернативы: |
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* * Сокрытие дочерних элементов |
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* - нельзя вообще никак модифицировать/читать структуру |
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* * Readonly root.children |
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* - не решает проблему |
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* * Readonly children of all nodes in registry |
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* - не проще в реализации, но налагает излишние ограничения |
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* Cons/Pros |
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* + позволяет свободно модифицировать узлы, не считая связей, определенных деревом |
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* + Через API узлов нельзя сломать структуру дерева |
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*/ |
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class Tree |
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{ |
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const NODE_EXISTS = 1; |
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const NODE_ADDED = 2; |
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const PARENT_NODE_NOT_FOUND = 3; |
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/** |
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* @var array |
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*/ |
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private $hierarchy; |
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/** |
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* @var NodeInterface[]|RegistryInterface |
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*/ |
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private $nodes; |
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/** |
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* @var TreeBuilder |
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*/ |
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private $builder; |
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/** |
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* @var bool |
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*/ |
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private $updateRequired = true; |
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/** |
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* @var ParentNodeInterface |
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*/ |
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private $root; |
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/** |
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* Tree constructor. |
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* |
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* @param ParentNodeInterface $root |
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* @param array $hierarchy |
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* @param array|Registry $nodes |
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*/ |
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public function __construct( |
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ParentNodeInterface $root, |
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array $hierarchy, |
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$nodes |
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) { |
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$this->hierarchy = $hierarchy; |
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$this->nodes = $nodes instanceof Registry ? $nodes : new Registry($nodes); |
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$this->builder = Utils::getDefaultTreeBuilder(); |
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$this->root = $root; |
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} |
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/** |
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* @return ParentNodeInterface |
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*/ |
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public function getRoot() |
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{ |
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return $this->root; |
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} |
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/** |
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* @return NodeInterface[] |
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*/ |
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public function getNodes() |
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{ |
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return $this->nodes->toArray(); |
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} |
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/** |
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* @return array |
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*/ |
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public function getHierarchy() |
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{ |
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return $this->hierarchy; |
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} |
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/** |
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* Builds tree based on its nodes registry and hierarchy configuration |
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* if structure update required. |
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*/ |
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public function build() |
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{ |
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if ($this->updateRequired) { |
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$this->updateRequired = false; |
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foreach ($this->nodes as $node) { |
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if ($node->parent()) { |
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$node->unlock()->detach(); |
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} |
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} |
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$this->root->addChildren($this->builder->build($this->hierarchy, $this->nodes->toArray())); |
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foreach ($this->nodes as $node) { |
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if ($node->parent() === $this->root || $this->nodes->contains($node->parent())) { |
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$node->lock(); |
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} |
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} |
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} |
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} |
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/** |
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* @param string|null $parentName |
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* @param string $nodeName |
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* @param ChildNodeInterface $node |
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* @return Tree |
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*/ |
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public function append($parentName = null, $nodeName, ChildNodeInterface $node) |
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{ |
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return $this->add($parentName, $nodeName, $node, false); |
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} |
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/** |
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* @param string|null $parentName |
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* @param string $nodeName |
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* @param ChildNodeInterface $node |
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* @return Tree |
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*/ |
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public function prepend($parentName = null, $nodeName, ChildNodeInterface $node) |
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{ |
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return $this->add($parentName, $nodeName, $node, true); |
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} |
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/** |
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* Replaces named tree node to new one. |
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* |
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* @param string $nodeName |
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* @param ChildNodeInterface $node |
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* |
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* @return $this |
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*/ |
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public function replace($nodeName, ChildNodeInterface $node) |
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{ |
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$this->removeNodeFromList($nodeName); |
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$this->nodes->set($nodeName, $node); |
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$this->updateRequired = true; |
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return $this; |
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} |
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/** |
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* Adds multiple nodes to tree. |
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* |
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* @param string|null $parentName root node will be used if null |
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* @param array $namedItems array with nodes where keys are node names |
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* @param bool $prepend if true, nodes will be prepended, otherwise appended to parent |
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* @return $this |
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*/ |
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public function addMany($parentName, array $namedItems, $prepend = false) |
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{ |
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foreach ($namedItems as $name => $item) { |
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$this->add($parentName, $name, $item, $prepend); |
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} |
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return $this; |
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} |
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/** |
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* Finds node by its name. |
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* |
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* @param string $nodeName |
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* @return null|object |
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*/ |
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public function get($nodeName) |
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{ |
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return $this->nodes->get($nodeName); |
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} |
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/** |
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* Returns true if tree contains node with specified name, returns false otherwise. |
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* |
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* @param string $nodeName |
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* @return bool |
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*/ |
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public function has($nodeName) |
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{ |
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return $this->nodes->hasKey($nodeName); |
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} |
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/** |
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* Moves node to another parent. |
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* |
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* @param string $nodeName target node name |
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* @param string|null $newParentName parent node name; root will be used if null |
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* @param bool $prepend |
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* @return $this |
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*/ |
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public function move($nodeName, $newParentName, $prepend = false) |
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{ |
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if (!$this->nodes->hasKey($nodeName)) { |
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throw new NodeNotFoundException(); |
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} |
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$node = $this->nodes->get($nodeName); |
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$this->remove($nodeName); |
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$this->add($newParentName, $nodeName, $node, $prepend); |
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return $this; |
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} |
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/** |
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* Removes node by its name. |
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* |
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* @param string $nodeName |
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* |
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* @return $this |
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*/ |
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public function remove($nodeName) |
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{ |
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$children = self::removeTreeNode($this->hierarchy, $nodeName); |
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// @todo remove all children |
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$this->removeNodeFromList($nodeName); |
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$this->updateRequired = true; |
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return $this; |
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} |
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/** |
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* Adds new tree node. If node exists, replaces it. |
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* |
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* @param string|null $parentName root if null |
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* @param string $nodeName new node name |
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* @param ChildNodeInterface $node |
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* |
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* @return $this |
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*/ |
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protected function add($parentName = null, $nodeName, ChildNodeInterface $node, $prepend = false) |
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{ |
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if (!self::addTreeNode($this->hierarchy, $parentName, $nodeName, $prepend)) { |
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throw new NodeNotFoundException( |
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"Can't add '$nodeName' node to '$parentName': '$parentName' node not found." |
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); |
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} |
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$this->removeNodeFromList($nodeName); |
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$this->nodes->set($nodeName, $node); |
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$this->updateRequired = true; |
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return $this; |
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} |
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/** |
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* @todo try array_walk_recursive |
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* |
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* @param array $tree |
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* @param string $parent node name or null for inserting into root node |
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* @param $node |
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* |
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* @throws \Exception |
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* |
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* @return bool false if no parent found |
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*/ |
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private static function addTreeNode(array &$tree, $parent, $node, $prepend = false) |
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{ |
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if ($parent === null) { |
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if (array_key_exists($node, $tree)) { |
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throw new \Exception('Node already exists'); |
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} |
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if ($prepend) { |
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$tree = array_merge([$node => []], $tree); |
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} else { |
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$tree[$node] = []; |
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} |
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return true; |
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} |
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foreach ($tree as $key => &$value) { |
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if ($key === $parent) { |
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return self::addTreeNode($value, null, $node, $prepend); |
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} else { |
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if (self::addTreeNode($value, $parent, $node, $prepend)) { |
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return true; |
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} |
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} |
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} |
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return false; |
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} |
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/** |
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* @param array $config |
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* @param $node |
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* |
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* @return false|array children of deleted node |
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*/ |
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private static function removeTreeNode(array &$config, $node) |
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{ |
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foreach ($config as $key => &$value) { |
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if ($key === $node) { |
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$children = $config[$node]; |
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unset($config[$node]); |
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return $children; |
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} else { |
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$result = self::removeTreeNode($value, $node); |
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if ($result !== false) { |
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return $result; |
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} |
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} |
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} |
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return false; |
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} |
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protected function removeNodeFromList($nodeName) |
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{ |
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if ($this->nodes->hasKey($nodeName)) { |
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$oldNode = $this->nodes->get($nodeName); |
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if ($oldNode->parent()) { |
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$oldNode->unlock()->detach(); |
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} |
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$this->nodes->removeByKey($nodeName); |
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$this->updateRequired = true; |
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} |
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} |
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} |
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This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently.
Both the
$myVar
assignment in line 1 and the$higher
assignment in line 2 are dead. The first because$myVar
is never used and the second because$higher
is always overwritten for every possible time line.