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<?php declare(strict_types=1); |
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namespace DaveRandom\Jom; |
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use DaveRandom\Jom\Exceptions\InvalidReferenceNodeException; |
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use DaveRandom\Jom\Exceptions\InvalidSubjectNodeException; |
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final class PointerGenerator |
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{ |
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/** |
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* @var Node |
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*/ |
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private $root; |
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/** |
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* @var Node|null |
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*/ |
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private $rootParent; |
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/** |
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* @var Document |
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*/ |
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private $ownerDocument; |
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/** |
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* @param Node[] $nodePath |
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* @return string[] |
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*/ |
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private function nodePathToPointerPath(array $nodePath): array |
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{ |
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$result = []; |
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for ($i = \count($nodePath) - 1; $i >= 0; $i--) { |
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$result[] = $nodePath[$i]->getKey(); |
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} |
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return $result; |
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} |
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/** |
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* @param Node[] $targetPath |
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* @param Node[]|null $basePath |
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* @throws InvalidSubjectNodeException |
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* @throws InvalidReferenceNodeException |
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*/ |
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private function validateAndRemoveNodePathRoots(array &$targetPath, array &$basePath = null): void |
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{ |
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if (\array_pop($targetPath) !== $this->root) { |
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throw new InvalidSubjectNodeException('Target node for pointer is not a child of the generator root node'); |
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} |
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if ($basePath !== null && \array_pop($basePath) !== $this->root) { |
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throw new InvalidReferenceNodeException('Base node for pointer is not a child of the generator root node'); |
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} |
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} |
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/** |
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* @param Node|Document $root |
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* @throws InvalidReferenceNodeException |
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*/ |
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public function __construct($root) |
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{ |
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if ($root instanceof Document) { |
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$root = $root->getRootNode(); |
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} |
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if (!($root instanceof Node)) { |
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throw new InvalidReferenceNodeException( |
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'Pointer generator root node must be instance of ' . Node::class . ' or ' . Document::class |
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); |
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} |
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$this->root = $root; |
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$this->rootParent = $root->getParent(); |
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$this->ownerDocument = $root->getOwnerDocument(); |
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} |
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public function getRootNode(): Node |
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{ |
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return $this->root; |
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} |
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/** |
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* @throws InvalidSubjectNodeException |
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*/ |
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public function generateAbsolutePointer(Node $target): Pointer |
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{ |
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try { |
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$targetPath = $target->getAncestors($this->root); |
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$this->validateAndRemoveNodePathRoots($targetPath); |
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return Pointer::createFromParameters($this->nodePathToPointerPath($targetPath)); |
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} catch (InvalidSubjectNodeException $e) { |
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throw $e; |
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//@codeCoverageIgnoreStart |
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} catch (\Exception $e) { |
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throw unexpected($e); |
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} |
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//@codeCoverageIgnoreEnd |
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} |
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/** |
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* @throws InvalidSubjectNodeException |
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* @throws InvalidReferenceNodeException |
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*/ |
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public function generateRelativePointer(Node $target, Node $base): Pointer |
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{ |
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$targetPath = $target->getAncestors($this->root); |
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$basePath = $base->getAncestors($this->root); |
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$this->validateAndRemoveNodePathRoots($targetPath, $basePath); |
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while (!empty($targetPath) && \end($targetPath) === \end($basePath)) { |
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2 |
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\array_pop($targetPath); |
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\array_pop($basePath); |
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} |
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try { |
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return Pointer::createFromParameters($this->nodePathToPointerPath($targetPath), \count($basePath)); |
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//@codeCoverageIgnoreStart |
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} catch (\Exception $e) { |
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throw unexpected($e); |
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} |
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//@codeCoverageIgnoreEnd |
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} |
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} |
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DaveRandom /
JOM
