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<?php declare(strict_types=1);

namespace PhpParser;

interface NodeTraverserInterface
{
    /**
     * Adds a visitor.
     *
     * @param NodeVisitor $visitor Visitor to add
     */
    public function addVisitor(NodeVisitor $visitor);

    /**
     * Removes an added visitor.
     *
     * @param NodeVisitor $visitor
     */
    public function removeVisitor(NodeVisitor $visitor);

    /**
     * Traverses an array of nodes using the registered visitors.
     *
     * @param Node[] $nodes Array of nodes
     *
     * @return Node[] Traversed array of nodes
     */
    public function traverse(array $nodes) : array;
}