Vendor

vendor/webonyx/graphql-php/src/Validator/Rules/UniqueFragmentNames.php

@@ -0,0 +1,48 @@
+<?php
+
+declare(strict_types=1);
+
+namespace GraphQL\Validator\Rules;
+
+use GraphQL\Error\Error;
+use GraphQL\Language\AST\FragmentDefinitionNode;
+use GraphQL\Language\AST\NameNode;
+use GraphQL\Language\AST\NodeKind;
+use GraphQL\Language\Visitor;
+use GraphQL\Validator\ValidationContext;
+use function sprintf;
+
+class UniqueFragmentNames extends ValidationRule
+{
+    /** @var NameNode[] */
+    public $knownFragmentNames;
+
+    public function getVisitor(ValidationContext $context)
+    {
+        $this->knownFragmentNames = [];
+
+        return [
+            NodeKind::OPERATION_DEFINITION => static function () {
+                return Visitor::skipNode();
+            },
+            NodeKind::FRAGMENT_DEFINITION  => function (FragmentDefinitionNode $node) use ($context) {
+                $fragmentName = $node->name->value;
+                if (empty($this->knownFragmentNames[$fragmentName])) {
+                    $this->knownFragmentNames[$fragmentName] = $node->name;
+                } else {
+                    $context->reportError(new Error(
+                        self::duplicateFragmentNameMessage($fragmentName),
+                        [$this->knownFragmentNames[$fragmentName], $node->name]
+                    ));
+                }
+
+                return Visitor::skipNode();
+            },
+        ];
+    }
+
+    public static function duplicateFragmentNameMessage($fragName)
+    {
+        return sprintf('There can be only one fragment named "%s".', $fragName);
+    }
+}