Version 4.5.0

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

@@ -0,0 +1,40 @@
+<?php
+namespace GraphQL\Validator\Rules;
+
+use GraphQL\Error\Error;
+use GraphQL\Language\AST\Node;
+use GraphQL\Language\AST\NodeKind;
+use GraphQL\Language\AST\VariableDefinitionNode;
+use GraphQL\Validator\ValidationContext;
+
+class UniqueVariableNames extends AbstractValidationRule
+{
+    static function duplicateVariableMessage($variableName)
+    {
+        return "There can be only one variable named \"$variableName\".";
+    }
+
+    public $knownVariableNames;
+
+    public function getVisitor(ValidationContext $context)
+    {
+        $this->knownVariableNames = [];
+
+        return [
+            NodeKind::OPERATION_DEFINITION => function() {
+                $this->knownVariableNames = [];
+            },
+            NodeKind::VARIABLE_DEFINITION => function(VariableDefinitionNode $node) use ($context) {
+                $variableName = $node->variable->name->value;
+                if (!empty($this->knownVariableNames[$variableName])) {
+                    $context->reportError(new Error(
+                        self::duplicateVariableMessage($variableName),
+                        [ $this->knownVariableNames[$variableName], $node->variable->name ]
+                    ));
+                } else {
+                    $this->knownVariableNames[$variableName] = $node->variable->name;
+                }
+            }
+        ];
+    }
+}