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<?php declare(strict_types=1); |
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namespace DaveRandom\Jom; |
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use DaveRandom\Jom\Exceptions\InvalidKeyException; |
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use DaveRandom\Jom\Exceptions\InvalidPointerException; |
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use DaveRandom\Jom\Exceptions\InvalidReferenceNodeException; |
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use DaveRandom\Jom\Exceptions\PointerReferenceNotFoundException; |
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final class PointerEvaluator |
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{ |
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private const NODE_TYPE_NAMES = [ |
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BooleanNode::class => 'boolean', |
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NumberNode::class => 'number', |
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StringNode::class => 'string', |
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NullNode::class => 'null', |
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]; |
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private $root; |
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/** |
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* @throws PointerReferenceNotFoundException |
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*/ |
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private function getValidArrayIndex(string $index, Pointer $pointer, int $level): int |
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{ |
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if (\preg_match('/^(?:0|[1-9][0-9]*)$/', $index)) { |
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return (int)$index; |
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} |
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throw new PointerReferenceNotFoundException( |
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"Array member must be referenced by integer index without leading zero", $pointer, $level |
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); |
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} |
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/** |
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* @throws PointerReferenceNotFoundException |
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*/ |
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private function getArrayIndexFromPathComponent(Pointer $pointer, ArrayNode $node, string $index, int $level) |
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{ |
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try { |
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return $node->item($this->getValidArrayIndex($index, $pointer, $level)); |
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} catch (InvalidKeyException $e) { |
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throw new PointerReferenceNotFoundException( |
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"The referenced index does not exist", $pointer, $level, $e |
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); |
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} |
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} |
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/** |
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* @throws PointerReferenceNotFoundException |
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*/ |
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private function getObjectPropertyFromPathComponent(Pointer $pointer, ObjectNode $node, string $name, int $level) |
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{ |
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try { |
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return $node->getProperty($name); |
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} catch (InvalidKeyException $e) { |
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throw new PointerReferenceNotFoundException( |
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'The referenced property does not exist', $pointer, $level, $e |
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); |
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} |
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} |
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/** |
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* @throws PointerReferenceNotFoundException |
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*/ |
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private function evaluatePointerPath(Pointer $pointer, Node $current): Node |
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{ |
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foreach ($pointer->getPath() as $level => $component) { |
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if ($current instanceof ObjectNode) { |
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$current = $this->getObjectPropertyFromPathComponent($pointer, $current, $component, $level); |
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continue; |
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} |
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if ($current instanceof ArrayNode) { |
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$current = $this->getArrayIndexFromPathComponent($pointer, $current, $component, $level); |
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continue; |
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} |
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$typeName = self::NODE_TYPE_NAMES[\get_class($current)] ?? 'unknown type'; |
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throw new PointerReferenceNotFoundException( |
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"Expecting object or array, got {$typeName}", $pointer, $level |
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); |
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} |
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return $current; |
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} |
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/** |
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* @throws InvalidReferenceNodeException |
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*/ |
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private function validateRelativePointerContextNode(Pointer $pointer, Node $context): void |
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{ |
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if ($context->getOwnerDocument() !== $this->root->getOwnerDocument()) { |
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throw new InvalidReferenceNodeException( |
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'Context node for relative pointer evaluation does not belong to the same document' |
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. ' as the evaluator root node' |
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); |
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} |
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if ($pointer->getRelativeLevels() > 0 && !$this->root->containsChild($context)) { |
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throw new InvalidReferenceNodeException( |
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'Context node for relative pointer evaluation is not a child of the root node' |
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); |
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} |
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} |
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/** |
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* @throws PointerReferenceNotFoundException |
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* @throws InvalidReferenceNodeException |
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*/ |
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private function evaluateRelativePointer(Pointer $pointer, Node $current): Node |
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{ |
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if ($current !== $this->root) { |
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$this->validateRelativePointerContextNode($pointer, $current); |
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} |
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for ($i = 0, $levels = $pointer->getRelativeLevels(); $i < $levels; $i++) { |
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if (($current ?? $this->root) === $this->root) { |
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throw new PointerReferenceNotFoundException( |
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"Relative pointer prefix overflows context node nesting level {$i}", $pointer |
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); |
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} |
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$current = $current->getParent(); |
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} |
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return $this->evaluatePointerPath($pointer, $current); |
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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 evaluator 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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} |
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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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* @param Pointer|string $pointer |
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* @return Node|int|string |
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* @throws InvalidPointerException |
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* @throws InvalidReferenceNodeException |
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* @throws PointerReferenceNotFoundException |
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*/ |
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public function evaluatePointer($pointer, ?Node $context = null) |
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{ |
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if (!($pointer instanceof Pointer)) { |
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$pointer = Pointer::createFromString((string)$pointer); |
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} |
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if (!$pointer->isRelative()) { |
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return $this->evaluatePointerPath($pointer, $this->root); |
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} |
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$target = $this->evaluateRelativePointer($pointer, $context ?? $this->root); |
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return $pointer->isKeyLookup() |
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? $target->getKey() |
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: $target; |
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} |
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} |
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DaveRandom /
JOM
