Merge pull request #88 from Braxilior/zrevrank

Implement zrevrank

Author: omansour

README.md

@@ -83,7 +83,8 @@ Redis command                                    | Description
 **ZCARD** *key*                                  | Returns the sorted set cardinality (number of elements) of the sorted set stored at *key*
 **ZRANGE** *key* *start* *stop* *[withscores]*   | Returns the specified range of members in a sorted set
 **ZRANGEBYSCORE** *key* *min* *max* *options*    | Returns a range of members in a sorted set, by score
-**ZRANK** *key* *member*                         | Returns the rank of *member* in the sorted set stored at *key*
+**ZRANK** *key* *member*                         | Returns the rank of *member* in the sorted set stored at *key*, with the scores ordered from low to high
+**ZREVRANK** *key* *member*                      | Returns the rank of *member* in the sorted set stored at *key*, with the scores ordered from high to low
 **ZREM** *key* *member*                          | Removes one membner from a sorted set
 **ZREMRANGEBYSCORE** *key* *min* *max*           | Removes all members in a sorted set within the given scores
 **ZREVRANGE** *key* *start* *stop* *[withscores]*| Returns the specified range of members in a sorted set, with scores ordered from high to low

src/M6Web/Component/RedisMock/RedisMock.php

@@ -1048,6 +1048,18 @@ public function zrank($key, $member)
         return $this->returnPipedInfo($rank);
     }
 
+    public function zrevrank($key, $member)
+    {
+        $rank = $this->zrank($key, $member);
+        if ($rank === null) {
+            return $this->returnPipedInfo(null);
+        }
+
+        $revRank = count(self::$dataValues[$this->storage][$key]) - $rank - 1;
+        
+        return $this->returnPipedInfo($revRank);
+    }
+
     public function zremrangebyscore($key, $min, $max) {
         if (!isset(self::$dataValues[$this->storage][$key]) || $this->deleteOnTtlExpired($key)) {
             return $this->returnPipedInfo(0);

tests/units/RedisMock.php

@@ -812,6 +812,27 @@ public function testZRank()
         $this->assert->variable($redisMock->zrank('invalid', 'whatever'))->isEqualTo(null);
     }
 
+    public function testZRevRank()
+    {
+        $redisMock = new Redis();
+        $redisMock->zadd('test', 4, 'test1');
+        $redisMock->zadd('test', 15, 'test2');
+        $redisMock->zadd('test', 2, 'test3');
+        $redisMock->zadd('test', 1, 'test4');
+        $redisMock->zadd('test', 30, 'test5');
+        $redisMock->zadd('test', 0, 'test6');
+
+        $this->assert->variable($redisMock->zrevrank('test', 'test5'))->isEqualTo(0);
+        $this->assert->variable($redisMock->zrevrank('test', 'test2'))->isEqualTo(1);
+        $this->assert->variable($redisMock->zrevrank('test', 'test1'))->isEqualTo(2);
+        $this->assert->variable($redisMock->zrevrank('test', 'test3'))->isEqualTo(3);
+        $this->assert->variable($redisMock->zrevrank('test', 'test4'))->isEqualTo(4);
+        $this->assert->variable($redisMock->zrevrank('test', 'test6'))->isEqualTo(5);
+
+        $this->assert->variable($redisMock->zrevrank('test', 'invalid'))->isEqualTo(null);
+        $this->assert->variable($redisMock->zrevrank('invalid', 'whatever'))->isEqualTo(null);
+    }
+
     public function testZRange()
     {
         $redisMock = new Redis();