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<?php |
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/****************************************************************************** |
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* An implementation of dicto (scg.unibe.ch/dicto) in and for PHP. |
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* |
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* Copyright (c) 2016 Richard Klees <[email protected]> |
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* |
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* This software is licensed under The MIT License. You should have received |
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* a copy of the license along with the code. |
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*/ |
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namespace Lechimp\Dicto\Graph; |
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use Lechimp\Dicto\Graph\Predicate; |
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/** |
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* The complete graph. |
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*/ |
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class Graph { |
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/** |
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* @var array<string, array<int, Node>> |
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*/ |
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protected $nodes = []; |
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/** |
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* @var int |
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*/ |
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protected $id_counter = 0; |
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/** |
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* Create a new node in the graph. |
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* |
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* @param string $type |
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* @param array<string,mixed>|null $properties |
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* @return Node |
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*/ |
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public function create_node($type, array $properties = null) { |
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$node = $this->build_node($this->id_counter, $type, $properties); |
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if (!array_key_exists($type, $this->nodes)) { |
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$this->nodes[$type] = []; |
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} |
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$this->nodes[$type][$this->id_counter] = $node; |
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$this->id_counter++; |
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return $node; |
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} |
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protected function build_node($id, $type, array $properties = null) { |
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return new Node($id, $type, $properties); |
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} |
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/** |
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* Add a relation to the graph. |
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* |
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* @param Node $left |
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* @param string $type |
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* @param array<string,mixed> $properties |
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* @param Node $right |
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* @return Relation |
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*/ |
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public function add_relation(Node $left, $type, array $properties, Node $right) { |
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return $left->add_relation($type, $properties, $right); |
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} |
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/** |
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* Get nodes from the graph, maybe filtered by a filter. |
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* |
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* @param Predicate|null $filter |
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* @return Iterator<Node> |
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*/ |
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public function nodes(Predicate $filter = null) { |
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if ($filter !== null) { |
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$types = $filter->for_types(array_keys($this->nodes)); |
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$filter = $filter->compile(); |
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} |
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else { |
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$types = array_keys($this->nodes); |
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} |
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foreach ($this->nodes as $type => $nodes) { |
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if (!in_array($type, $types)) { |
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continue; |
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} |
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foreach ($nodes as $node) { |
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if ($filter === null) { |
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yield $node; |
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} |
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else { |
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if ($filter($node)) { |
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yield $node; |
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} |
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} |
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} |
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} |
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} |
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/** |
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* Get the node with the given id. |
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* |
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* @param int $id |
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* @throws \InvalidArgumentException if $id is unknown |
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* @return Node |
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*/ |
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public function node($id) { |
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assert('is_int($id)'); |
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foreach ($this->nodes as $nodes) { |
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if (array_key_exists($id, $nodes)) { |
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return $nodes[$id]; |
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} |
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} |
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throw new \InvalidArgumentException("Unknown node id '$id'"); |
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} |
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/** |
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* Build a query on the graph. |
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* |
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* @return Query |
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*/ |
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public function query() { |
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return new QueryImpl($this); |
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} |
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} |
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lechimp-p /
dicto.php
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