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<?php
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declare(strict_types=1);
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namespace DI\Definition\Source;
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use DI\Definition\Definition;
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use DI\Definition\ExtendsPreviousDefinition;
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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 <matthieu@mnapoli.fr>
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*/
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class SourceChain implements DefinitionSource, MutableDefinitionSource
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{
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private ?MutableDefinitionSource $mutableSource;
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/**
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* @param list<DefinitionSource> $sources
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*/
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public function __construct(
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private array $sources,
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) {
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}
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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 $startIndex = 0) : Definition|null
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{
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$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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$definition = $source->getDefinition($name);
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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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return $definition;
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}
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}
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return null;
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}
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public function getDefinitions() : array
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{
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$allDefinitions = array_merge(...array_map(fn ($source) => $source->getDefinitions(), $this->sources));
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/** @var string[] $allNames */
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$allNames = array_keys($allDefinitions);
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$allValues = array_filter(array_map(fn ($name) => $this->getDefinition($name), $allNames));
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return array_combine($allNames, $allValues);
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}
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public function addDefinition(Definition $definition) : void
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{
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if (! $this->mutableSource) {
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throw new \LogicException("The container's definition source has not been initialized correctly");
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}
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$this->mutableSource->addDefinition($definition);
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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(), $currentIndex + 1);
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if ($subDefinition) {
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$definition->setExtendedDefinition($subDefinition);
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}
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}
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public function setMutableDefinitionSource(MutableDefinitionSource $mutableSource) : void
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{
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$this->mutableSource = $mutableSource;
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array_unshift($this->sources, $mutableSource);
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}
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}
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