Added fav: support to post searching

TODO

@@ -12,7 +12,6 @@ everything related to posts:
         - search filters
             - comment:rr-
             - comment_count: 3..5
-            - fav:rr-
             - file_size:3K..5M
             - image_size:huge/large/medium/small
             - type:img/flash/yt/video

src/Dao/PostDao.php

@@ -110,6 +110,11 @@ class PostDao extends AbstractDao implements ICrudDao
 			return;
 		}
 
+		elseif ($requirement->getType() === \Szurubooru\SearchServices\Filters\PostFilter::REQUIREMENT_FAVORITE)
+		{
+			$query->innerJoin('favorites _fav ON _fav.postId = posts.id INNER JOIN users favorite ON favorite.id = _fav.userId');
+		}
+
 		elseif ($requirement->getType() === \Szurubooru\SearchServices\Filters\PostFilter::REQUIREMENT_UPLOADER)
 		{
 			$query->innerJoin('users uploader ON uploader.id = userId');

src/SearchServices/Filters/PostFilter.php

@@ -19,6 +19,7 @@ class PostFilter extends BasicFilter implements IFilter
 	const REQUIREMENT_SCORE = 'score';
 	const REQUIREMENT_UPLOADER = 'uploader.name';
 	const REQUIREMENT_SAFETY = 'safety';
+	const REQUIREMENT_FAVORITE = 'favorite.name';
 
 	public function __construct()
 	{

src/SearchServices/Parsers/PostSearchParser.php

@@ -43,6 +43,9 @@ class PostSearchParser extends AbstractSearchParser
 		elseif ($token->getKey() === 'safety')
 			$this->addSafetyRequirement($filter, $token);
 
+		elseif ($token->getKey() === 'fav')
+			$this->addFavRequirement($filter, $token);
+
 		else
 			throw new \BadMethodCallException('Not supported');
 	}
@@ -166,6 +169,14 @@ class PostSearchParser extends AbstractSearchParser
 			});
 	}
 
+	private function addFavRequirement($filter, $token)
+	{
+		$this->addRequirementFromToken(
+			$filter,
+			$token,
+			\Szurubooru\SearchServices\Filters\PostFilter::REQUIREMENT_FAVORITE,
+			self::ALLOW_COMPOSITE);
+	}
 
 	private function dateToTime($value)
 	{