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Edit File: VisitorReplacing.php

<?php

/**
 * Replacing Visitor
 *
 * @package Less
 * @subpackage visitor
 */
class Less_VisitorReplacing extends Less_Visitor{

public function visitObj( $node ){

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

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

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

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

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

return $node;
	}

public function visitArray( $nodes ){

$newNodes = array();
		foreach($nodes as $node){
			$evald = $this->visitObj($node);
			if( $evald ){
				if( is_array($evald) ){
					self::flatten($evald,$newNodes);
				}else{
					$newNodes[] = $evald;
				}
			}
		}
		return $newNodes;
	}

public function flatten( $arr, &$out ){

foreach($arr as $item){
			if( !is_array($item) ){
				$out[] = $item;
				continue;
			}

foreach($item as $nestedItem){
				if( is_array($nestedItem) ){
					self::flatten( $nestedItem, $out);
				}else{
					$out[] = $nestedItem;
				}
			}
		}

return $out;
	}

}

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