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<?php |
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declare(strict_types=1); |
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namespace GraphQL\Validator\Rules; |
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use GraphQL\Error\Error; |
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use GraphQL\Language\AST\FragmentDefinitionNode; |
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use GraphQL\Language\AST\FragmentSpreadNode; |
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use GraphQL\Language\AST\NodeKind; |
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use GraphQL\Language\Visitor; |
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use GraphQL\Utils\Utils; |
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use GraphQL\Validator\ValidationContext; |
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use function array_merge; |
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use function array_pop; |
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use function array_slice; |
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use function count; |
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use function implode; |
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use function is_array; |
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use function sprintf; |
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class NoFragmentCycles extends ValidationRule |
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{ |
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/** @var bool[] */ |
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public $visitedFrags; |
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/** @var FragmentSpreadNode[] */ |
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public $spreadPath; |
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/** @var (int|null)[] */ |
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public $spreadPathIndexByName; |
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131 |
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public function getVisitor(ValidationContext $context) |
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{ |
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// Tracks already visited fragments to maintain O(N) and to ensure that cycles |
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// are not redundantly reported. |
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$this->visitedFrags = []; |
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// Array of AST nodes used to produce meaningful errors |
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$this->spreadPath = []; |
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// Position in the spread path |
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$this->spreadPathIndexByName = []; |
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return [ |
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NodeKind::OPERATION_DEFINITION => static function () { |
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return Visitor::skipNode(); |
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131 |
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}, |
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NodeKind::FRAGMENT_DEFINITION => function (FragmentDefinitionNode $node) use ($context) { |
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$this->detectCycleRecursive($node, $context); |
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return Visitor::skipNode(); |
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131 |
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}, |
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]; |
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} |
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private function detectCycleRecursive(FragmentDefinitionNode $fragment, ValidationContext $context) |
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{ |
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if (! empty($this->visitedFrags[$fragment->name->value])) { |
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return; |
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} |
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$fragmentName = $fragment->name->value; |
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$this->visitedFrags[$fragmentName] = true; |
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$spreadNodes = $context->getFragmentSpreads($fragment); |
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if (empty($spreadNodes)) { |
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return; |
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} |
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$this->spreadPathIndexByName[$fragmentName] = count($this->spreadPath); |
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for ($i = 0; $i < count($spreadNodes); $i++) { |
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$spreadNode = $spreadNodes[$i]; |
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$spreadName = $spreadNode->name->value; |
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$cycleIndex = $this->spreadPathIndexByName[$spreadName] ?? null; |
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$this->spreadPath[] = $spreadNode; |
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if ($cycleIndex === null) { |
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$spreadFragment = $context->getFragment($spreadName); |
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if ($spreadFragment) { |
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$this->detectCycleRecursive($spreadFragment, $context); |
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} |
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} else { |
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$cyclePath = array_slice($this->spreadPath, $cycleIndex); |
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$fragmentNames = Utils::map(array_slice($cyclePath, 0, -1), static function ($s) { |
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return $s->name->value; |
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}); |
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$context->reportError(new Error( |
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self::cycleErrorMessage($spreadName, $fragmentNames), |
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$cyclePath |
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)); |
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} |
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array_pop($this->spreadPath); |
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} |
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$this->spreadPathIndexByName[$fragmentName] = null; |
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} |
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/** |
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* @param string[] $spreadNames |
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*/ |
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public static function cycleErrorMessage($fragName, array $spreadNames = []) |
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{ |
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return sprintf( |
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'Cannot spread fragment "%s" within itself%s.', |
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$fragName, |
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! empty($spreadNames) ? ' via ' . implode(', ', $spreadNames) : '' |
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); |
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} |
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} |
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webonyx /
graphql-php
If the size of the collection does not change during the iteration, it is generally a good practice to compute it beforehand, and not on each iteration: