Version 4.5.0

system/3rd_party/graphql-php/Validator/Rules/UniqueInputFieldNames.php

@@ -0,0 +1,51 @@
+<?php
+namespace GraphQL\Validator\Rules;
+
+use GraphQL\Error\Error;
+use GraphQL\Language\AST\Node;
+use GraphQL\Language\AST\NodeKind;
+use GraphQL\Language\AST\ObjectFieldNode;
+use GraphQL\Language\Visitor;
+use GraphQL\Validator\ValidationContext;
+
+class UniqueInputFieldNames extends AbstractValidationRule
+{
+    static function duplicateInputFieldMessage($fieldName)
+    {
+      return "There can be only one input field named \"$fieldName\".";
+    }
+
+    public $knownNames;
+    public $knownNameStack;
+
+    public function getVisitor(ValidationContext $context)
+    {
+        $this->knownNames = [];
+        $this->knownNameStack = [];
+
+        return [
+            NodeKind::OBJECT => [
+                'enter' => function() {
+                    $this->knownNameStack[] = $this->knownNames;
+                    $this->knownNames = [];
+                },
+                'leave' => function() {
+                    $this->knownNames = array_pop($this->knownNameStack);
+                }
+            ],
+            NodeKind::OBJECT_FIELD => function(ObjectFieldNode $node) use ($context) {
+                $fieldName = $node->name->value;
+
+                if (!empty($this->knownNames[$fieldName])) {
+                    $context->reportError(new Error(
+                        self::duplicateInputFieldMessage($fieldName),
+                        [ $this->knownNames[$fieldName], $node->name ]
+                    ));
+                } else {
+                    $this->knownNames[$fieldName] = $node->name;
+                }
+                return Visitor::skipNode();
+            }
+        ];
+    }
+}