<?php

/**
 * Extend
 *
 * @package Less
 * @subpackage tree
 */
class Less_Tree_Extend extends Less_Tree{

	public $selector;
	public $option;
	public $index;
	public $selfSelectors = array();
	public $allowBefore;
	public $allowAfter;
	public $firstExtendOnThisSelectorPath;
	public $type = 'Extend';
	public $ruleset;


	public $object_id;
	public $parent_ids = array();

	/**
	 * @param integer $index
	 */
    public function __construct($selector, $option, $index){
		static $i = 0;
		$this->selector = $selector;
		$this->option = $option;
		$this->index = $index;

		switch($option){
			case "all":
				$this->allowBefore = true;
				$this->allowAfter = true;
			break;
			default:
				$this->allowBefore = false;
				$this->allowAfter = false;
			break;
		}

		// This must use a string (instead of int) so that array_merge()
		// preserves keys on arrays that use IDs in their keys.
		$this->object_id = 'id_' . $i++;

		$this->parent_ids = array(
			$this->object_id => true
		);
	}

    public function accept( $visitor ){
		$this->selector = $visitor->visitObj( $this->selector );
	}

    public function compile( $env ){
		Less_Parser::$has_extends = true;
		$this->selector = $this->selector->compile($env);
		return $this;
		//return new Less_Tree_Extend( $this->selector->compile($env), $this->option, $this->index);
	}

    public function findSelfSelectors( $selectors ){
		$selfElements = array();


		for( $i = 0, $selectors_len = count($selectors); $i < $selectors_len; $i++ ){
			$selectorElements = $selectors[$i]->elements;
			// duplicate the logic in genCSS function inside the selector node.
			// future TODO - move both logics into the selector joiner visitor
			if( $i && $selectorElements && $selectorElements[0]->combinator === "") {
				$selectorElements[0]->combinator = ' ';
			}
			$selfElements = array_merge( $selfElements, $selectors[$i]->elements );
		}

		$this->selfSelectors = array(new Less_Tree_Selector($selfElements));
	}

}