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