qrcode.chapril.org/vendor/wikimedia/less.php/lib/Less/Visitor.php

<?php
/**
 * @private
 */
class Less_Visitor {

	protected $methods = [];
	protected $_visitFnCache = [];

	public function __construct() {
		$this->_visitFnCache = get_class_methods( get_class( $this ) );
		$this->_visitFnCache = array_flip( $this->_visitFnCache );
	}

	public function visitObj( $node ) {
		$funcName = 'visit' . $node->type;
		if ( isset( $this->_visitFnCache[$funcName] ) ) {

			$visitDeeper = true;
			$this->$funcName( $node, $visitDeeper );

			if ( $visitDeeper ) {
				$node->accept( $this );
			}

			$funcName .= "Out";
			if ( isset( $this->_visitFnCache[$funcName] ) ) {
				$this->$funcName( $node );
			}

		} else {
			$node->accept( $this );
		}

		return $node;
	}

	public function visitArray( $nodes ) {
		foreach ( $nodes as $node ) {
			$this->visitObj( $node );
		}
		return $nodes;
	}
}