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    <h3>Editing: ComplexityCalculatingVisitor.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php declare(strict_types=1);
/*
 * This file is part of sebastian/complexity.
 *
 * (c) Sebastian Bergmann &lt;sebastian@phpunit.de&gt;
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace SebastianBergmann\Complexity;

use function assert;
use function is_array;
use PhpParser\Node;
use PhpParser\Node\Name;
use PhpParser\Node\Stmt;
use PhpParser\Node\Stmt\Class_;
use PhpParser\Node\Stmt\ClassMethod;
use PhpParser\Node\Stmt\Function_;
use PhpParser\Node\Stmt\Trait_;
use PhpParser\NodeTraverser;
use PhpParser\NodeVisitorAbstract;

final class ComplexityCalculatingVisitor extends NodeVisitorAbstract
{
    /**
     * @psalm-var list&lt;Complexity&gt;
     */
    private $result = [];

    /**
     * @var bool
     */
    private $shortCircuitTraversal;

    public function __construct(bool $shortCircuitTraversal)
    {
        $this-&gt;shortCircuitTraversal = $shortCircuitTraversal;
    }

    public function enterNode(Node $node): ?int
    {
        if (!$node instanceof ClassMethod &amp;&amp; !$node instanceof Function_) {
            return null;
        }

        if ($node instanceof ClassMethod) {
            $name = $this-&gt;classMethodName($node);
        } else {
            $name = $this-&gt;functionName($node);
        }

        $statements = $node-&gt;getStmts();

        assert(is_array($statements));

        $this-&gt;result[] = new Complexity(
            $name,
            $this-&gt;cyclomaticComplexity($statements)
        );

        if ($this-&gt;shortCircuitTraversal) {
            return NodeTraverser::DONT_TRAVERSE_CHILDREN;
        }

        return null;
    }

    public function result(): ComplexityCollection
    {
        return ComplexityCollection::fromList(...$this-&gt;result);
    }

    /**
     * @param Stmt[] $statements
     */
    private function cyclomaticComplexity(array $statements): int
    {
        $traverser = new NodeTraverser;

        $cyclomaticComplexityCalculatingVisitor = new CyclomaticComplexityCalculatingVisitor;

        $traverser-&gt;addVisitor($cyclomaticComplexityCalculatingVisitor);

        /* @noinspection UnusedFunctionResultInspection */
        $traverser-&gt;traverse($statements);

        return $cyclomaticComplexityCalculatingVisitor-&gt;cyclomaticComplexity();
    }

    private function classMethodName(ClassMethod $node): string
    {
        $parent = $node-&gt;getAttribute('parent');

        assert($parent instanceof Class_ || $parent instanceof Trait_);
        assert(isset($parent-&gt;namespacedName));
        assert($parent-&gt;namespacedName instanceof Name);

        return $parent-&gt;namespacedName-&gt;toString() . '::' . $node-&gt;name-&gt;toString();
    }

    private function functionName(Function_ $node): string
    {
        assert(isset($node-&gt;namespacedName));
        assert($node-&gt;namespacedName instanceof Name);

        return $node-&gt;namespacedName-&gt;toString();
    }
}
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