[OptionsResolver] Removed LazyOption class and improved performance a…

… tiny bit

src/Symfony/Component/OptionsResolver/Options.php

@@ -21,7 +21,7 @@
 class Options implements \ArrayAccess, \Iterator, \Countable
 {
     /**
-     * A list of option values and LazyOption instances.
+     * A list of option values.
      * @var array
      */
     private $options = array();
@@ -33,19 +33,13 @@ class Options implements \ArrayAccess, \Iterator, \Countable
     private $normalizers = array();
 
     /**
-     * A list storing the names of all options that need to be normalized.
-     * @var array
-     */
-    private $normalization = array();
-
-    /**
-     * A list storing the names of all LazyOption instances as keys.
+     * A list of closures for evaluating lazy options.
      * @var array
      */
     private $lazy = array();
 
     /**
-     * A list of Boolean locks for each LazyOption.
+     * A list containing the currently locked options.
      * @var array
      */
     private $lock = array();
@@ -95,6 +89,7 @@ public function set($option, $value)
         // Setting is equivalent to overloading while discarding the previous
         // option value
         unset($this->options[$option]);
+        unset($this->lazy[$option]);
 
         $this->overload($option, $value);
     }
@@ -126,9 +121,6 @@ public function setNormalizer($option, \Closure $normalizer)
         }
 
         $this->normalizers[$option] = $normalizer;
-
-        // Each option for which a normalizer exists needs to be normalized
-        $this->normalization[$option] = true;
     }
 
     /**
@@ -150,6 +142,7 @@ public function replace(array $options)
         }
 
         $this->options = array();
+        $this->lazy = array();
 
         foreach ($options as $option => $value) {
             $this->overload($option, $value);
@@ -184,25 +177,30 @@ public function overload($option, $value)
         }
 
         // If an option is a closure that should be evaluated lazily, store it
-        // inside a LazyOption instance.
+        // in the "lazy" property.
         if ($value instanceof \Closure) {
             $reflClosure = new \ReflectionFunction($value);
             $params = $reflClosure->getParameters();
 
             if (isset($params[0]) && null !== ($class = $params[0]->getClass()) && __CLASS__ === $class->name) {
-                $currentValue = isset($params[1]) && isset($this->options[$option]) ? $this->options[$option] : null;
-                $value = new LazyOption($value, $currentValue);
+                // Initialize the option if no previous value exists
+                if (!isset($this->options[$option])) {
+                    $this->options[$option] = null;
+                }
 
-                // Store which options are lazy for more efficient resolving
-                $this->lazy[$option] = true;
+                // Ignore previous lazy options if the closure has no second parameter
+                if (!isset($this->lazy[$option]) || !isset($params[1])) {
+                    $this->lazy[$option] = array();
+                }
 
-                $this->options[$option] = $value;
+                // Store closure for later evaluation
+                $this->lazy[$option][] = $value;
 
                 return;
             }
         }
 
-        // Reset lazy flag and locks by default
+        // Remove lazy options by default
         unset($this->lazy[$option]);
 
         $this->options[$option] = $value;
@@ -233,7 +231,7 @@ public function get($option)
             $this->resolve($option);
         }
 
-        if (isset($this->normalization[$option])) {
+        if (isset($this->normalizers[$option])) {
             $this->normalize($option);
         }
 
@@ -269,6 +267,7 @@ public function remove($option)
 
         unset($this->options[$option]);
         unset($this->lazy[$option]);
+        unset($this->normalizers[$option]);
     }
 
     /**
@@ -286,6 +285,7 @@ public function clear()
 
         $this->options = array();
         $this->lazy = array();
+        $this->normalizers = array();
     }
 
     /**
@@ -301,14 +301,16 @@ public function all()
 
         // Performance-wise this is slightly better than
         // while (null !== $option = key($this->lazy))
-        foreach ($this->lazy as $option => $isLazy) {
+        foreach ($this->lazy as $option => $closures) {
+            // Double check, in case the option has already been resolved
+            // by cascade in the previous cycles
             if (isset($this->lazy[$option])) {
                 $this->resolve($option);
             }
         }
 
-        foreach ($this->normalization as $option => $normalize) {
-            if (isset($this->normalization[$option])) {
+        foreach ($this->normalizers as $option => $normalizer) {
+            if (isset($this->normalizers[$option])) {
                 $this->normalize($option);
             }
         }
@@ -443,6 +445,10 @@ public function count()
      */
     private function resolve($option)
     {
+        // The code duplication with normalize() exists for performance
+        // reasons, in order to save a method call.
+        // Remember that this method is potentially called a couple of thousand
+        // times and needs to be as efficient as possible.
         if (isset($this->lock[$option])) {
             $conflicts = array();
 
@@ -456,7 +462,9 @@ private function resolve($option)
         }
 
         $this->lock[$option] = true;
-        $this->options[$option] = $this->options[$option]->evaluate($this);
+        foreach ($this->lazy[$option] as $closure) {
+            $this->options[$option] = $closure($this, $this->options[$option]);
+        }
         unset($this->lock[$option]);
 
         // The option now isn't lazy anymore
@@ -475,6 +483,10 @@ private function resolve($option)
      */
     private function normalize($option)
     {
+        // The code duplication with resolve() exists for performance
+        // reasons, in order to save a method call.
+        // Remember that this method is potentially called a couple of thousand
+        // times and needs to be as efficient as possible.
         if (isset($this->lock[$option])) {
             $conflicts = array();
 
@@ -495,6 +507,6 @@ private function normalize($option)
         unset($this->lock[$option]);
 
         // The option is now normalized
-        unset($this->normalization[$option]);
+        unset($this->normalizers[$option]);
     }
 }