41 lines
1.3 KiB
PHP
41 lines
1.3 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\Node;
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use GraphQL\Language\AST\NodeKind;
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use GraphQL\Language\AST\VariableDefinitionNode;
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use GraphQL\Validator\ValidationContext;
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class UniqueVariableNames extends AbstractValidationRule
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{
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static function duplicateVariableMessage($variableName)
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{
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return "There can be only one variable named \"$variableName\".";
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}
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public $knownVariableNames;
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public function getVisitor(ValidationContext $context)
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{
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$this->knownVariableNames = [];
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return [
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NodeKind::OPERATION_DEFINITION => function() {
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$this->knownVariableNames = [];
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},
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NodeKind::VARIABLE_DEFINITION => function(VariableDefinitionNode $node) use ($context) {
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$variableName = $node->variable->name->value;
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if (!empty($this->knownVariableNames[$variableName])) {
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$context->reportError(new Error(
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self::duplicateVariableMessage($variableName),
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[ $this->knownVariableNames[$variableName], $node->variable->name ]
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));
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} else {
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$this->knownVariableNames[$variableName] = $node->variable->name;
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}
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}
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];
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}
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}
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