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<?php
/**
 * @private
 */
class Less_Tree_Selector extends Less_Tree {

	public $elements;
	public $condition;
	public $extendList = [];
	public $_css;
	public $index;
	public $evaldCondition = false;
	public $type = 'Selector';
	public $currentFileInfo = [];
	public $isReferenced;
	public $mediaEmpty;

	public $elements_len = 0;

	public $_oelements;
	public $_oelements_assoc;
	public $_oelements_len;
	public $cacheable = true;

	/**
	 * @param bool $isReferenced
	 */
	public function __construct( $elements, $extendList = [], $condition = null, $index = null, $currentFileInfo = null, $isReferenced = null ) {
		$this->elements = $elements;
		$this->elements_len = count( $elements );
		$this->extendList = $extendList;
		$this->condition = $condition;
		if ( $currentFileInfo ) {
			$this->currentFileInfo = $currentFileInfo;
		}
		$this->isReferenced = $isReferenced;
		if ( !$condition ) {
			$this->evaldCondition = true;
		}

		$this->CacheElements();
	}

	public function accept( $visitor ) {
		$this->elements = $visitor->visitArray( $this->elements );
		$this->extendList = $visitor->visitArray( $this->extendList );
		if ( $this->condition ) {
			$this->condition = $visitor->visitObj( $this->condition );
		}

		if ( $visitor instanceof Less_Visitor_extendFinder ) {
			$this->CacheElements();
		}
	}

	public function createDerived( $elements, $extendList = null, $evaldCondition = null ) {
		$newSelector = new Less_Tree_Selector(
			$elements,
			( $extendList ?: $this->extendList ),
			null,
			$this->index,
			$this->currentFileInfo,
			$this->isReferenced
		);
		$newSelector->evaldCondition = $evaldCondition ?: $this->evaldCondition;
		$newSelector->mediaEmpty = $this->mediaEmpty;
		return $newSelector;
	}

	public function match( $other ) {
		if ( !$other->_oelements || ( $this->elements_len < $other->_oelements_len ) ) {
			return 0;
		}

		for ( $i = 0; $i < $other->_oelements_len; $i++ ) {
			if ( $this->elements[$i]->value !== $other->_oelements[$i] ) {
				return 0;
			}
		}

		return $other->_oelements_len; // return number of matched elements
	}

	public function CacheElements() {
		$this->_oelements = [];
		$this->_oelements_assoc = [];

		$css = '';

		foreach ( $this->elements as $v ) {

			$css .= $v->combinator;
			if ( !$v->value_is_object ) {
				$css .= $v->value;
				continue;
			}

			if ( !property_exists( $v->value, 'value' ) || !is_string( $v->value->value ) ) {
				$this->cacheable = false;
				return;
			}
			$css .= $v->value->value;
		}

		$this->_oelements_len = preg_match_all( '/[,&#\.\w-](?:[\w-]|(?:\\\\.))*/', $css, $matches );
		if ( $this->_oelements_len ) {
			$this->_oelements = $matches[0];

			if ( $this->_oelements[0] === '&' ) {
				array_shift( $this->_oelements );
				$this->_oelements_len--;
			}

			$this->_oelements_assoc = array_fill_keys( $this->_oelements, true );
		}
	}

	public function isJustParentSelector() {
		return !$this->mediaEmpty &&
			count( $this->elements ) === 1 &&
			$this->elements[0]->value === '&' &&
			( $this->elements[0]->combinator === ' ' || $this->elements[0]->combinator === '' );
	}

	public function compile( $env ) {
		$elements = [];
		foreach ( $this->elements as $el ) {
			$elements[] = $el->compile( $env );
		}

		$extendList = [];
		foreach ( $this->extendList as $el ) {
			$extendList[] = $el->compile( $el );
		}

		$evaldCondition = false;
		if ( $this->condition ) {
			$evaldCondition = $this->condition->compile( $env );
		}

		return $this->createDerived( $elements, $extendList, $evaldCondition );
	}

	/**
	 * @see Less_Tree::genCSS
	 */
	public function genCSS( $output, $firstSelector = true ) {
		if ( !$firstSelector && $this->elements[0]->combinator === "" ) {
			$output->add( ' ', $this->currentFileInfo, $this->index );
		}

		foreach ( $this->elements as $element ) {
			$element->genCSS( $output );
		}
	}

	public function markReferenced() {
		$this->isReferenced = true;
	}

	public function getIsReferenced() {
		return !isset( $this->currentFileInfo['reference'] ) || !$this->currentFileInfo['reference'] || $this->isReferenced;
	}

	public function getIsOutput() {
		return $this->evaldCondition;
	}

}