Version 4.5.0

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

@@ -0,0 +1,56 @@
+<?php
+namespace GraphQL\Validator\Rules;
+
+use GraphQL\Error\Error;
+use GraphQL\Language\AST\NodeKind;
+use GraphQL\Language\AST\OperationDefinitionNode;
+use GraphQL\Validator\ValidationContext;
+
+class NoUnusedVariables extends AbstractValidationRule
+{
+    static function unusedVariableMessage($varName, $opName = null)
+    {
+        return $opName
+            ? "Variable \"$$varName\" is never used in operation \"$opName\"."
+            : "Variable \"$$varName\" is never used.";
+    }
+
+    public $variableDefs;
+
+    public function getVisitor(ValidationContext $context)
+    {
+        $this->variableDefs = [];
+
+        return [
+            NodeKind::OPERATION_DEFINITION => [
+                'enter' => function() {
+                    $this->variableDefs = [];
+                },
+                'leave' => function(OperationDefinitionNode $operation) use ($context) {
+                    $variableNameUsed = [];
+                    $usages = $context->getRecursiveVariableUsages($operation);
+                    $opName = $operation->name ? $operation->name->value : null;
+
+                    foreach ($usages as $usage) {
+                        $node = $usage['node'];
+                        $variableNameUsed[$node->name->value] = true;
+                    }
+
+                    foreach ($this->variableDefs as $variableDef) {
+                        $variableName = $variableDef->variable->name->value;
+
+                        if (empty($variableNameUsed[$variableName])) {
+                            $context->reportError(new Error(
+                                self::unusedVariableMessage($variableName, $opName),
+                                [$variableDef]
+                            ));
+                        }
+                    }
+                }
+            ],
+            NodeKind::VARIABLE_DEFINITION => function($def) {
+                $this->variableDefs[] = $def;
+            }
+        ];
+    }
+}