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<?php
namespace GraphQL\Validator\Rules;
use GraphQL\Error\Error;
use GraphQL\Language\AST\ArgumentNode;
use GraphQL\Language\AST\Node;
use GraphQL\Language\AST\NodeKind;
use GraphQL\Language\Visitor;
use GraphQL\Validator\ValidationContext;
class UniqueArgumentNames extends AbstractValidationRule
{
static function duplicateArgMessage($argName)
{
return "There can be only one argument named \"$argName\".";
}
public $knownArgNames;
public function getVisitor(ValidationContext $context)
{
$this->knownArgNames = [];
return [
NodeKind::FIELD => function () {
$this->knownArgNames = [];;
},
NodeKind::DIRECTIVE => function () {
$this->knownArgNames = [];
},
NodeKind::ARGUMENT => function (ArgumentNode $node) use ($context) {
$argName = $node->name->value;
if (!empty($this->knownArgNames[$argName])) {
$context->reportError(new Error(
self::duplicateArgMessage($argName),
[$this->knownArgNames[$argName], $node->name]
));
} else {
$this->knownArgNames[$argName] = $node->name;
}
return Visitor::skipNode();
}
];
}
}