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<?php |
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declare(strict_types=1); |
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namespace Remorhaz\JSON\Path\Runtime\Matcher; |
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use function is_int; |
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use function max; |
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use Remorhaz\JSON\Data\Value\NodeValueInterface; |
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use Remorhaz\JSON\Path\Runtime\ValueFetcherInterface; |
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final class SliceElementMatcher implements ChildMatcherInterface |
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{ |
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private $valueFetcher; |
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private $start; |
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private $end; |
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private $step; |
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private $isReverse; |
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public function __construct(ValueFetcherInterface $valueFetcher, ?int $start, ?int $end, ?int $step) |
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{ |
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$this->valueFetcher = $valueFetcher; |
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$this->step = $step ?? 1; |
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$this->isReverse = $step < 0; |
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$this->start = $start; |
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$this->end = $end; |
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} |
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public function match($address, NodeValueInterface $value, NodeValueInterface $container): bool |
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{ |
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if (0 == $this->step || !is_int($address)) { |
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return false; |
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} |
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$count = $this->findArrayLength($container); |
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if (!isset($count)) { |
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return false; |
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} |
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$start = $this->detectStart($count); |
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$end = $this->detectEnd($count); |
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return $this->isInRange($address, $start, $end) && $this->isOnStep($address, $start); |
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} |
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private function findArrayLength(NodeValueInterface $value): ?int |
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{ |
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$count = $this |
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->valueFetcher |
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->fetchArrayLength($value); |
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return isset($count) && $count > 0 |
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? $count |
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: null; |
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} |
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private function detectStart(int $count): int |
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{ |
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$start = $this->start; |
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if (!isset($start)) { |
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$start = $this->isReverse ? -1 : 0; |
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} |
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if ($start < 0) { |
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$start = max($start + $count, 0); |
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} |
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return $start; |
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} |
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private function detectEnd(int $count): int |
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{ |
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$end = $this->end; |
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if (!isset($end)) { |
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$end = $this->isReverse ? -$count - 1 : $count; |
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} |
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if ($end > $count) { |
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return $count; |
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} |
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return $end < 0 |
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? max($end + $count, $this->isReverse ? -1 : 0) |
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: $end; |
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} |
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private function isInRange(int $address, int $start, int $end): bool |
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{ |
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return $this->isReverse |
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? $address <= $start && $address > $end |
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: $address >= $start && $address < $end; |
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} |
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private function isOnStep(int $address, int $start): bool |
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{ |
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return 0 == ($this->isReverse ? $start - $address : $address - $start) % $this->step; |
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} |
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} |
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remorhaz /
php-json-path
