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