1: <?php
 2: 
 3: namespace Guzzle\Inflection;
 4: 
 5: /**
 6:  * Decorator used to add memoization to previously inflected words
 7:  */
 8: class MemoizingInflector implements InflectorInterface
 9: {
10:     /**
11:      * @var array Array of cached inflections
12:      */
13:     protected $cache = array(
14:         'snake' => array(),
15:         'camel' => array()
16:     );
17: 
18:     /**
19:      * @var int Max entries per cache
20:      */
21:     protected $maxCacheSize;
22: 
23:     /**
24:      * @var InflectorInterface Decorated inflector
25:      */
26:     protected $decoratedInflector;
27: 
28:     /**
29:      * @param InflectorInterface $inflector    Inflector being decorated
30:      * @param int                $maxCacheSize Maximum number of cached items to hold per cache
31:      */
32:     public function __construct(InflectorInterface $inflector, $maxCacheSize = 500)
33:     {
34:         $this->decoratedInflector = $inflector;
35:         $this->maxCacheSize = $maxCacheSize;
36:     }
37: 
38:     /**
39:      * {@inheritdoc}
40:      */
41:     public function snake($word)
42:     {
43:         if (!isset($this->cache['snake'][$word])) {
44:             $this->pruneCache('snake');
45:             $this->cache['snake'][$word] = $this->decoratedInflector->snake($word);
46:         }
47: 
48:         return $this->cache['snake'][$word];
49:     }
50: 
51:     /**
52:      * Converts strings from snake_case to upper CamelCase
53:      *
54:      * @param string $word Value to convert into upper CamelCase
55:      *
56:      * @return string
57:      */
58:     public function camel($word)
59:     {
60:         if (!isset($this->cache['camel'][$word])) {
61:             $this->pruneCache('camel');
62:             $this->cache['camel'][$word] = $this->decoratedInflector->camel($word);
63:         }
64: 
65:         return $this->cache['camel'][$word];
66:     }
67: 
68:     /**
69:      * Prune one of the named caches by removing 20% of the cache if it is full
70:      *
71:      * @param string $cache Type of cache to prune
72:      */
73:     protected function pruneCache($cache)
74:     {
75:         if (count($this->cache[$cache]) == $this->maxCacheSize) {
76:             $this->cache[$cache] = array_slice($this->cache[$cache], $this->maxCacheSize * 0.2);
77:         }
78:     }
79: }
80: