VisitorReplacing.php
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VisitorReplacing.php
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	<?php
	/**
	* @private
	*/
	class Less_VisitorReplacing extends Less_Visitor {

	public function visitArray( &$nodes ) {
	$newNodes = [];
	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;
	}

	}