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File: SourceChain.php
<?php declare(strict_types=1); namespace DI\Definition\Source; use DI\Definition\Definition; use DI\Definition\ExtendsPreviousDefinition; /** * Manages a chain of other definition sources. * * @author Matthieu Napoli <matthieu@mnapoli.fr> */ class SourceChain implements DefinitionSource, MutableDefinitionSource { /** * @var DefinitionSource[] */ private $sources; /** * @var DefinitionSource */ private $rootSource; /** * @var MutableDefinitionSource|null */ private $mutableSource; /** * @param DefinitionSource[] $sources */ public function __construct(array $sources) { // We want a numerically indexed array to ease the traversal later $this->sources = array_values($sources); $this->rootSource = $this; } /** * {@inheritdoc} * * @param int $startIndex Use this parameter to start looking from a specific * point in the source chain. */ public function getDefinition(string $name, int $startIndex = 0) { $count = count($this->sources); for ($i = $startIndex; $i < $count; ++$i) { $source = $this->sources[$i]; $definition = $source->getDefinition($name); if ($definition) { if ($definition instanceof ExtendsPreviousDefinition) { $this->resolveExtendedDefinition($definition, $i); } return $definition; } } return null; } public function getDefinitions() : array { $names = []; foreach ($this->sources as $source) { $names = array_merge($names, $source->getDefinitions()); } $names = array_keys($names); $definitions = array_combine($names, array_map(function (string $name) { return $this->getDefinition($name); }, $names)); return $definitions; } public function addDefinition(Definition $definition) { if (! $this->mutableSource) { throw new \LogicException("The container's definition source has not been initialized correctly"); } $this->mutableSource->addDefinition($definition); } private function resolveExtendedDefinition(ExtendsPreviousDefinition $definition, int $currentIndex) { // Look in the next sources only (else infinite recursion, and we can only extend // entries defined in the previous definition files - a previous == next here because // the array was reversed ;) ) $subDefinition = $this->getDefinition($definition->getName(), $currentIndex + 1); if ($subDefinition) { $definition->setExtendedDefinition($subDefinition); } } public function setMutableDefinitionSource(MutableDefinitionSource $mutableSource) { $this->mutableSource = $mutableSource; array_unshift($this->sources, $mutableSource); } }