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name : toCSS.php
 <?php

/**
 * toCSS Visitor
 *
 * @package Less
 * @subpackage visitor
 */
class Less_Visitor_toCSS extends Less_VisitorReplacing{

	private $charset;

	public function __construct(){
		parent::__construct();
	}

	/**
	 * @param Less_Tree_Ruleset $root
	 */
	public function run( $root ){
		return $this->visitObj($root);
	}

	public function visitRule( $ruleNode ){
		if( $ruleNode->variable ){
			return array();
		}
		return $ruleNode;
	}

	public function visitMixinDefinition($mixinNode){
		// mixin definitions do not get eval'd - this means they keep state
		// so we have to clear that state here so it isn't used if toCSS is called twice
		$mixinNode->frames = array();
		return array();
	}

	public function visitExtend(){
		return array();
	}

	public function visitComment( $commentNode ){
		if( $commentNode->isSilent() ){
			return array();
		}
		return $commentNode;
	}

	public function visitMedia( $mediaNode, &$visitDeeper ){
		$mediaNode->accept($this);
		$visitDeeper = false;

		if( !$mediaNode->rules ){
			return array();
		}
		return $mediaNode;
	}

	public function visitDirective( $directiveNode ){
		if( isset($directiveNode->currentFileInfo['reference']) && (!property_exists($directiveNode,'isReferenced') || !$directiveNode->isReferenced) ){
			return array();
		}
		if( $directiveNode->name === '@charset' ){
			// Only output the debug info together with subsequent @charset definitions
			// a comment (or @media statement) before the actual @charset directive would
			// be considered illegal css as it has to be on the first line
			if( isset($this->charset) && $this->charset ){

				//if( $directiveNode->debugInfo ){
				//	$comment = new Less_Tree_Comment('/* ' . str_replace("\n",'',$directiveNode->toCSS())." */\n");
				//	$comment->debugInfo = $directiveNode->debugInfo;
				//	return $this->visit($comment);
				//}


				return array();
			}
			$this->charset = true;
		}
		return $directiveNode;
	}

	public function checkPropertiesInRoot( $rulesetNode ){

		if( !$rulesetNode->firstRoot ){
			return;
		}

		foreach($rulesetNode->rules as $ruleNode){
			if( $ruleNode instanceof Less_Tree_Rule && !$ruleNode->variable ){
				$msg = "properties must be inside selector blocks, they cannot be in the root. Index ".$ruleNode->index.($ruleNode->currentFileInfo ? (' Filename: '.$ruleNode->currentFileInfo['filename']) : null);
				throw new Less_Exception_Compiler($msg);
			}
		}
	}


	public function visitRuleset( $rulesetNode, &$visitDeeper ){

		$visitDeeper = false;

		$this->checkPropertiesInRoot( $rulesetNode );

		if( $rulesetNode->root ){
			return $this->visitRulesetRoot( $rulesetNode );
		}

		$rulesets = array();
		$rulesetNode->paths = $this->visitRulesetPaths($rulesetNode);


		// Compile rules and rulesets
		$nodeRuleCnt = count($rulesetNode->rules);
		for( $i = 0; $i < $nodeRuleCnt; ){
			$rule = $rulesetNode->rules[$i];

			if( property_exists($rule,'rules') ){
				// visit because we are moving them out from being a child
				$rulesets[] = $this->visitObj($rule);
				array_splice($rulesetNode->rules,$i,1);
				$nodeRuleCnt--;
				continue;
			}
			$i++;
		}


		// accept the visitor to remove rules and refactor itself
		// then we can decide now whether we want it or not
		if( $nodeRuleCnt > 0 ){
			$rulesetNode->accept($this);

			if( $rulesetNode->rules ){

				if( count($rulesetNode->rules) >  1 ){
					$this->_mergeRules( $rulesetNode->rules );
					$this->_removeDuplicateRules( $rulesetNode->rules );
				}

				// now decide whether we keep the ruleset
				if( $rulesetNode->paths ){
					//array_unshift($rulesets, $rulesetNode);
					array_splice($rulesets,0,0,array($rulesetNode));
				}
			}

		}


		if( count($rulesets) === 1 ){
			return $rulesets[0];
		}
		return $rulesets;
	}


	/**
	 * Helper function for visitiRuleset
	 *
	 * return array|Less_Tree_Ruleset
	 */
	private function visitRulesetRoot( $rulesetNode ){
		$rulesetNode->accept( $this );
		if( $rulesetNode->firstRoot || $rulesetNode->rules ){
			return $rulesetNode;
		}
		return array();
	}


	/**
	 * Helper function for visitRuleset()
	 *
	 * @return array
	 */
	private function visitRulesetPaths($rulesetNode){

		$paths = array();
		foreach($rulesetNode->paths as $p){
			if( $p[0]->elements[0]->combinator === ' ' ){
				$p[0]->elements[0]->combinator = '';
			}

			foreach($p as $pi){
				if( $pi->getIsReferenced() && $pi->getIsOutput() ){
					$paths[] = $p;
					break;
				}
			}
		}

		return $paths;
	}

	protected function _removeDuplicateRules( &$rules ){
		// remove duplicates
		$ruleCache = array();
		for( $i = count($rules)-1; $i >= 0 ; $i-- ){
			$rule = $rules[$i];
			if( $rule instanceof Less_Tree_Rule || $rule instanceof Less_Tree_NameValue ){

				if( !isset($ruleCache[$rule->name]) ){
					$ruleCache[$rule->name] = $rule;
				}else{
					$ruleList =& $ruleCache[$rule->name];

					if( $ruleList instanceof Less_Tree_Rule || $ruleList instanceof Less_Tree_NameValue ){
						$ruleList = $ruleCache[$rule->name] = array( $ruleCache[$rule->name]->toCSS() );
					}

					$ruleCSS = $rule->toCSS();
					if( array_search($ruleCSS,$ruleList) !== false ){
						array_splice($rules,$i,1);
					}else{
						$ruleList[] = $ruleCSS;
					}
				}
			}
		}
	}

	protected function _mergeRules( &$rules ){
		$groups = array();

		//obj($rules);

		$rules_len = count($rules);
		for( $i = 0; $i < $rules_len; $i++ ){
			$rule = $rules[$i];

			if( ($rule instanceof Less_Tree_Rule) && $rule->merge ){

				$key = $rule->name;
				if( $rule->important ){
					$key .= ',!';
				}

				if( !isset($groups[$key]) ){
					$groups[$key] = array();
				}else{
					array_splice($rules, $i--, 1);
					$rules_len--;
				}

				$groups[$key][] = $rule;
			}
		}


		foreach($groups as $parts){

			if( count($parts) > 1 ){
				$rule = $parts[0];
				$spacedGroups = array();
				$lastSpacedGroup = array();
				$parts_mapped = array();
				foreach($parts as $p){
					if( $p->merge === '+' ){
						if( $lastSpacedGroup ){
							$spacedGroups[] = self::toExpression($lastSpacedGroup);
						}
						$lastSpacedGroup = array();
					}
					$lastSpacedGroup[] = $p;
				}

				$spacedGroups[] = self::toExpression($lastSpacedGroup);
				$rule->value = self::toValue($spacedGroups);
			}
		}

	}

	public static function toExpression($values){
		$mapped = array();
		foreach($values as $p){
			$mapped[] = $p->value;
		}
		return new Less_Tree_Expression( $mapped );
	}

	public static function toValue($values){
		//return new Less_Tree_Value($values); ??

		$mapped = array();
		foreach($values as $p){
			$mapped[] = $p;
		}
		return new Less_Tree_Value($mapped);
	}
}
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