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Edit File: IsNullFunctionTypeSpecifyingExtension.php

<?php declare(strict_types = 1);

namespace PHPStan\Type\Php;

use PhpParser\Node\Expr\FuncCall;
use PHPStan\Analyser\Scope;
use PHPStan\Analyser\SpecifiedTypes;
use PHPStan\Analyser\TypeSpecifier;
use PHPStan\Analyser\TypeSpecifierAwareExtension;
use PHPStan\Analyser\TypeSpecifierContext;
use PHPStan\Reflection\FunctionReflection;
use PHPStan\Type\FunctionTypeSpecifyingExtension;
use PHPStan\Type\NullType;

class IsNullFunctionTypeSpecifyingExtension implements FunctionTypeSpecifyingExtension, TypeSpecifierAwareExtension
{

/** @var \PHPStan\Analyser\TypeSpecifier */
	private $typeSpecifier;

public function isFunctionSupported(FunctionReflection $functionReflection, FuncCall $node, TypeSpecifierContext $context): bool
	{
		return strtolower($functionReflection->getName()) === 'is_null'
			&& isset($node->args[0])
			&& !$context->null();
	}

public function specifyTypes(FunctionReflection $functionReflection, FuncCall $node, Scope $scope, TypeSpecifierContext $context): SpecifiedTypes
	{
		if ($context->null()) {
			throw new \PHPStan\ShouldNotHappenException();
		}

return $this->typeSpecifier->create($node->args[0]->value, new NullType(), $context);
	}

public function setTypeSpecifier(TypeSpecifier $typeSpecifier): void
	{
		$this->typeSpecifier = $typeSpecifier;
	}

}