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

	public $contexts = [];
	public $allExtendsStack;
	public $foundExtends;

	public function __construct() {
		$this->contexts = [];
		$this->allExtendsStack = [ [] ];
		parent::__construct();
	}

	/**
	 * @param Less_Tree_Ruleset $root
	 */
	public function run( $root ) {
		$root = $this->visitObj( $root );
		$root->allExtends =& $this->allExtendsStack[0];
		return $root;
	}

	public function visitRule( $ruleNode, &$visitDeeper ) {
		$visitDeeper = false;
	}

	public function visitMixinDefinition( $mixinDefinitionNode, &$visitDeeper ) {
		$visitDeeper = false;
	}

	public function visitRuleset( $rulesetNode ) {
		if ( $rulesetNode->root ) {
			return;
		}

		$allSelectorsExtendList = [];

		// get &:extend(.a); rules which apply to all selectors in this ruleset
		if ( $rulesetNode->rules ) {
			foreach ( $rulesetNode->rules as $rule ) {
				if ( $rule instanceof Less_Tree_Extend ) {
					$allSelectorsExtendList[] = $rule;
					$rulesetNode->extendOnEveryPath = true;
				}
			}
		}

		// now find every selector and apply the extends that apply to all extends
		// and the ones which apply to an individual extend
		foreach ( $rulesetNode->paths as $selectorPath ) {
			$selector = end( $selectorPath ); // $selectorPath[ count($selectorPath)-1];

			$j = 0;
			foreach ( $selector->extendList as $extend ) {
				$this->allExtendsStackPush( $rulesetNode, $selectorPath, $extend, $j );
			}
			foreach ( $allSelectorsExtendList as $extend ) {
				$this->allExtendsStackPush( $rulesetNode, $selectorPath, $extend, $j );
			}
		}

		$this->contexts[] = $rulesetNode->selectors;
	}

	public function allExtendsStackPush( $rulesetNode, $selectorPath, $extend, &$j ) {
		$this->foundExtends = true;
		$extend = clone $extend;
		$extend->findSelfSelectors( $selectorPath );
		$extend->ruleset = $rulesetNode;
		if ( $j === 0 ) {
			$extend->firstExtendOnThisSelectorPath = true;
		}

		$end_key = count( $this->allExtendsStack ) - 1;
		$this->allExtendsStack[$end_key][] = $extend;
		$j++;
	}

	public function visitRulesetOut( $rulesetNode ) {
		if ( !is_object( $rulesetNode ) || !$rulesetNode->root ) {
			array_pop( $this->contexts );
		}
	}

	public function visitMedia( $mediaNode ) {
		$mediaNode->allExtends = [];
		$this->allExtendsStack[] =& $mediaNode->allExtends;
	}

	public function visitMediaOut() {
		array_pop( $this->allExtendsStack );
	}

	public function visitDirective( $directiveNode ) {
		$directiveNode->allExtends = [];
		$this->allExtendsStack[] =& $directiveNode->allExtends;
	}

	public function visitDirectiveOut() {
		array_pop( $this->allExtendsStack );
	}
}