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<?php |
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namespace Bankiru\Seo\Destination; |
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use Bankiru\Seo\Destination; |
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use Bankiru\Seo\Exception\DestinationException; |
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use Bankiru\Seo\SourceFiller; |
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use Bankiru\Seo\SourceInterface; |
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final class CartesianDestinationGenerator implements DestinationGenerator |
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{ |
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/** {@inheritdoc} */ |
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public function generate($route, array $sources, array $fillers = []) |
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{ |
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$itemsCollection = $this->cartesian($sources); |
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$this->validateFillerCircularity($fillers); |
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$itemsCollection = $this->infer($itemsCollection, $fillers); |
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return array_map( |
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function ($items) use ($route) { |
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return new Destination($route, $items); |
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}, |
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$itemsCollection |
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); |
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} |
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/** {@inheritdoc} */ |
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public function count(array $sources) |
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{ |
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if (count($sources) === 0) { |
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return 0; |
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} |
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$count = 1; |
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foreach ($sources as $source) { |
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$count *= $source->count(); |
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} |
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return $count; |
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} |
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/** |
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* Returns cartesian product of sources |
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* |
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* @param SourceInterface[] $sources |
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* |
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* @return array |
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*/ |
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private function cartesian($sources) |
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{ |
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$result = [[]]; |
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foreach ($sources as $key => $source) { |
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$append = []; |
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foreach ($result as $product) { |
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foreach ($source as $item) { |
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$product[$key] = $item; |
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$append[] = $product; |
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} |
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} |
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$result = $append; |
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} |
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return $result; |
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} |
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/** |
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* @param SourceFiller[] $fillers |
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* |
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* @throws DestinationException |
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*/ |
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private function validateFillerCircularity(array $fillers) |
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{ |
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foreach ($fillers as $code => $filler) { |
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$visited = [$code]; |
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$this->visitFiller($filler, $fillers, $visited); |
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} |
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} |
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/** |
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* @param SourceFiller $filler |
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* @param SourceFiller[] $fillers |
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* @param string[] $visited |
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* |
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* @throws DestinationException |
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*/ |
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private function visitFiller(SourceFiller $filler, array $fillers, array &$visited) |
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{ |
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foreach ($filler->getDependencies() as $code) { |
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if (!array_key_exists($code, $fillers)) { |
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continue; |
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} |
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if (in_array($code, $visited, true)) { |
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throw DestinationException::circularInference($code, $visited); |
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} |
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$visited[] = $code; |
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$this->visitFiller($fillers[$code], $fillers, $visited); |
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} |
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} |
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/** |
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* @param array[] $items |
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* @param SourceFiller[] $fillers |
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* |
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* @return array |
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* @throws DestinationException |
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*/ |
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private function infer(array $items, array $fillers) |
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{ |
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foreach ($items as &$item) { |
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foreach ($fillers as $code => $filler) { |
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$item = $this->inferCode($item, $code, $fillers); |
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} |
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} |
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return $items; |
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} |
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/** |
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* @param array $item |
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* @param string $code |
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* @param SourceFiller[] $fillers |
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* |
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* @return array |
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* |
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* @throws DestinationException |
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*/ |
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private function inferCode(array $item, $code, array $fillers) |
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{ |
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if (!array_key_exists($code, $fillers)) { |
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throw DestinationException::inferenceFailed($code, $item, $fillers); |
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} |
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$filler = $fillers[$code]; |
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foreach ($filler->getDependencies() as $key) { |
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if (!array_key_exists($key, $item)) { |
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$item[$key] = $this->inferCode($item, $key, $fillers); |
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} |
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} |
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$item[$code] = $filler->infer($item); |
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return $item; |
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} |
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} |
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bankiru /
seo-engine
