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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Digia\GraphQL\Validation\Rule;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Digia\GraphQL\Error\ValidationException;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Digia\GraphQL\Language\Node\NodeInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Digia\GraphQL\Language\Node\SelectionSetNode;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Digia\GraphQL\Validation\Conflict\FindsConflictsTrait;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Digia\GraphQL\Validation\Conflict\Map;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Digia\GraphQL\Validation\Conflict\PairSet;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use function Digia\GraphQL\Validation\fieldsConflictMessage;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Overlapping fields can be merged  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * A selection set is only valid if all fields (including spreading any  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * fragments) either correspond to distinct response names or can be merged  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * without ambiguity.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class OverlappingFieldsCanBeMergedRule extends AbstractRule  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    use FindsConflictsTrait;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * OverlappingFieldsCanBeMergedRule constructor.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function __construct()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->cachedFieldsAndFragmentNames = new Map();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->comparedFragmentPairs        = new PairSet();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @inheritdoc  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function enterNode(NodeInterface $node): ?NodeInterface  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        if ($node instanceof SelectionSetNode) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $parentType = $this->validationContext->getParentType();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $conflicts = $this->findConflictsWithinSelectionSet(  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                $this->cachedFieldsAndFragmentNames,  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                $this->comparedFragmentPairs,  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                $node,  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                $parentType  | 
            
                            
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                            );  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            foreach ($conflicts as $conflict) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                                $this->validationContext->reportError(  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                    new ValidationException(  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                        fieldsConflictMessage($conflict->getResponseName(), $conflict->getReason()),  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                        $conflict->getAllFields()  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                    )  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                );  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        return $node;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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