symfony
diff --git a/‎components/options_resolver.rst
Copy file name to clipboardExpand all lines: components/options_resolver.rst
+60-38Lines changed: 60 additions & 38 deletions b/‎components/options_resolver.rst
Copy file name to clipboardExpand all lines: components/options_resolver.rst
+60-38Lines changed: 60 additions & 38 deletions
@@ -5,7 +5,9 @@
 The OptionsResolver Component
 =============================
 
-    The OptionsResolver component is `array_replace()` on steroids.
+    The OptionsResolver component is :phpfunction:`array_replace` on steroids.
+    It allows you to create an options system with required options, defaults,
+    validation (type, value), normalization and more.
 
 Installation
 ------------
@@ -20,8 +22,8 @@ Notes on Previous Versions
 
 .. versionadded:: 2.6
     This documentation was written for Symfony 2.6 and later. If you use an older
-    version, please read the corresponding documentation using the version
-    drop-down on the upper right.
+    version, please `read the Symfony 2.5 documentation`_. For a list of changes,
+    see the `CHANGELOG`_.
 
 Usage
 -----
@@ -48,29 +50,35 @@ check which options are set::
         public function sendMail($from, $to)
         {
             $mail = ...;
+
             $mail->setHost(isset($this->options['host'])
                 ? $this->options['host']
                 : 'smtp.example.org');
+
             $mail->setUsername(isset($this->options['username'])
                 ? $this->options['username']
                 : 'user');
+
             $mail->setPassword(isset($this->options['password'])
                 ? $this->options['password']
                 : 'pa$$word');
+
             $mail->setPort(isset($this->options['port'])
                 ? $this->options['port']
                 : 25);
+
             // ...
         }
     }
 
 This boilerplate is hard to read and repetitive. Also, the default values of the
-options are buried in the business logic of your code. We can use
+options are buried in the business logic of your code. Use the
 :phpfunction:`array_replace` to fix that::
 
     class Mailer
     {
         // ...
+
         public function __construct(array $options = array())
         {
             $this->options = array_replace(array(
@@ -83,27 +91,27 @@ options are buried in the business logic of your code. We can use
     }
 
 Now all four options are guaranteed to be set. But what happens if the user of
-the ``Mailer`` class does a mistake?
+the ``Mailer`` class makes a mistake?
 
 .. code-block:: php
 
     $mailer = new Mailer(array(
         'usernme' => 'johndoe',
     ));
 
-No error will be shown. In the best case, the bug will be appear during testing.
-The developer will possibly spend a lot of time looking for the problem. In the
-worst case, however, the bug won't even appear and will be deployed to the live
-system.
+No error will be shown. In the best case, the bug will appear during testing,
+but the developer will spend time looking for the problem. In the worst case,
+the bug might not appear until it's deployed to the live system.
 
-Let's use the :class:`Symfony\\Component\\OptionsResolver\\OptionsResolver`
-class to fix this problem::
+Fortunately, the :class:`Symfony\\Component\\OptionsResolver\\OptionsResolver`
+class helps you to fix this problem::
 
     use Symfony\Component\OptionsResolver\Options;
 
     class Mailer
     {
         // ...
+
         public function __construct(array $options = array())
         {
             $resolver = new OptionsResolver();
@@ -136,6 +144,7 @@ code::
     class Mailer
     {
         // ...
+
         public function sendMail($from, $to)
         {
             $mail = ...;
@@ -153,6 +162,7 @@ It's a good practice to split the option configuration into a separate method::
     class Mailer
     {
         // ...
+
         public function __construct(array $options = array())
         {
             $resolver = new OptionsResolver();
@@ -164,10 +174,10 @@ It's a good practice to split the option configuration into a separate method::
         protected function configureOptions(OptionsResolver $resolver)
         {
             $resolver->setDefaults(array(
-                'host' => 'smtp.example.org',
-                'username' => 'user',
-                'password' => 'pa$$word',
-                'port' => 25,
+                'host'       => 'smtp.example.org',
+                'username'   => 'user',
+                'password'   => 'pa$$word',
+                'port'       => 25,
                 'encryption' => null,
             ));
         }
@@ -196,12 +206,13 @@ Required Options
 
 If an option must be set by the caller, pass that option to
 :method:`Symfony\\Component\\OptionsResolver\\OptionsResolver::setRequired`.
-For example, let's make the ``host`` option required::
+For example, to make the ``host`` option required, you can do::
 
     // ...
     class Mailer
     {
         // ...
+
         protected function configureOptions(OptionsResolver $resolver)
         {
             // ...
@@ -210,8 +221,8 @@ For example, let's make the ``host`` option required::
     }
 
 .. versionadded:: 2.6
-    Before Symfony 2.6, `setRequired()` accepted only arrays. Since then, single
-    option names can be passed as well.
+    As of Symfony 2.6, ``setRequired()`` accepts both an array of options or a
+    single option. Prior to 2.6, you could only pass arrays.
 
 If you omit a required option, a
 :class:`Symfony\\Component\\OptionsResolver\\Exception\\MissingOptionsException`
@@ -229,6 +240,7 @@ one required option::
     class Mailer
     {
         // ...
+
         protected function configureOptions(OptionsResolver $resolver)
         {
             // ...
@@ -268,14 +280,15 @@ retrieve the names of all required options::
 
 If you want to check whether a required option is still missing from the default
 options, you can use :method:`Symfony\\Component\\OptionsResolver\\OptionsResolver::isMissing`.
-The difference to :method:`Symfony\\Component\\OptionsResolver\\OptionsResolver::isRequired`
-is that this method will return false for required options that have already
+The difference between this and :method:`Symfony\\Component\\OptionsResolver\\OptionsResolver::isRequired`
+is that this method will return false if a required option has already
 been set::
 
     // ...
     class Mailer
     {
         // ...
+
         protected function configureOptions(OptionsResolver $resolver)
         {
             // ...
@@ -320,6 +333,7 @@ correctly. To validate the types of the options, call
     class Mailer
     {
         // ...
+
         protected function configureOptions(OptionsResolver $resolver)
         {
             // ...
@@ -329,8 +343,8 @@ correctly. To validate the types of the options, call
     }
 
 For each option, you can define either just one type or an array of acceptable
-types. You can pass any type for which an ``is_<type>()`` method is defined.
-Additionally, you may pass fully qualified class or interface names.
+types. You can pass any type for which an ``is_<type>()`` function is defined
+in PHP. Additionally, you may pass fully qualified class or interface names.
 
 If you pass an invalid option now, an
 :class:`Symfony\\Component\\OptionsResolver\\Exception\\InvalidOptionsException`
@@ -348,9 +362,7 @@ to add additional allowed types without erasing the ones already set.
 
 .. versionadded:: 2.6
     Before Symfony 2.6, `setAllowedTypes()` and `addAllowedTypes()` expected
-    the values to be given as an array mapping option names to allowed types:
-
-    .. code-block:: php
+    the values to be given as an array mapping option names to allowed types::
 
         $resolver->setAllowedTypes(array('port' => array('null', 'int')));
 
@@ -360,13 +372,14 @@ Value Validation
 Some options can only take one of a fixed list of predefined values. For
 example, suppose the ``Mailer`` class has a ``transport`` option which can be
 one of ``sendmail``, ``mail`` and ``smtp``. Use the method
-:method:`Symfony\\Component\\OptionsResolver\\OptionsResolver::setAllowedValues` to verify
-that the passed option contains one of these values::
+:method:`Symfony\\Component\\OptionsResolver\\OptionsResolver::setAllowedValues`
+to verify that the passed option contains one of these values::
 
     // ...
     class Mailer
     {
         // ...
+
         protected function configureOptions(OptionsResolver $resolver)
         {
             // ...
@@ -420,9 +433,11 @@ option. You can configure a normalizer by calling
     class Mailer
     {
         // ...
+
         protected function configureOptions(OptionsResolver $resolver)
         {
             // ...
+
             $resolver->setNormalizer('host', function ($options, $value) {
                 if ('http://' !== substr($value, 0, 7)) {
                     $value = 'http://'.$value;
@@ -467,12 +482,12 @@ Default Values that Depend on another Option
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 Suppose you want to set the default value of the ``port`` option based on the
-encryption chosen by the user of the ``Mailer`` class. More precisely, we want
+encryption chosen by the user of the ``Mailer`` class. More precisely, you want
 to set the port to ``465`` if SSL is used and to ``25`` otherwise.
 
-You can implement this feature by passing a closure as default value of the
-``port`` option. The closure receives the options as argument. Based on these
-options, you can return the desired default value::
+You can implement this feature by passing a closure as the default value of
+the ``port`` option. The closure receives the options as argument. Based on
+these options, you can return the desired default value::
 
     use Symfony\Component\OptionsResolver\Options;
 
@@ -498,7 +513,7 @@ options, you can return the desired default value::
 .. caution::
 
     The argument of the callable must be type hinted as ``Options``. Otherwise,
-    the callable is considered as the default value of the option.
+    the callable itself is considered as the default value of the option.
 
 .. note::
 
@@ -546,8 +561,10 @@ Options without Default Values
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 In some cases, it is useful to define an option without setting a default value.
-Mostly, you will need this when you want to know whether an option was passed
-or not. If you set a default value for that option, this is not possible::
+This is useful if you need to know whether or not the user *actually* set
+an option or not. For example, if you set the default value for an option,
+it's not possible to know whether the user passed this value or if it simply
+comes from the default::
 
     // ...
     class Mailer
@@ -584,6 +601,7 @@ be included in the resolved options if it was actually passed to
     class Mailer
     {
         // ...
+
         protected function configureOptions(OptionsResolver $resolver)
         {
             // ...
@@ -637,6 +655,8 @@ let you find out which options are defined::
     // ...
     class GoogleMailer extends Mailer
     {
+        // ...
+
         protected function configureOptions(OptionsResolver $resolver)
         {
             parent::configureOptions($resolver);
@@ -671,10 +691,10 @@ can change your code to do the configuration only once per class::
 
         public function __construct(array $options = array())
         {
-            // Are we a Mailer, a GoogleMailer, ... ?
+            // What type of Mailer is this, a Mailer, a GoogleMailer, ... ?
             $class = get_class($this);
 
-            // Did we call configureOptions() before for this class?
+            // Was configureOptions() executed before for this class?
             if (!isset(self::$resolversByClass[$class])) {
                 self::$resolversByClass[$class] = new OptionsResolver();
                 $this->configureOptions(self::$resolversByClass[$class]);
@@ -693,14 +713,14 @@ Now the :class:`Symfony\\Component\\OptionsResolver\\OptionsResolver` instance
 will be created once per class and reused from that on. Be aware that this may
 lead to memory leaks in long-running applications, if the default options contain
 references to objects or object graphs. If that's the case for you, implement a
-method ``clearDefaultOptions()`` and call it periodically::
+method ``clearOptionsConfig()`` and call it periodically::
 
     // ...
     class Mailer
     {
         private static $resolversByClass = array();
 
-        public static function clearDefaultOptions()
+        public static function clearOptionsConfig()
         {
             self::$resolversByClass = array();
         }
@@ -713,3 +733,5 @@ options in your code.
 
 .. _Packagist: https://packagist.org/packages/symfony/options-resolver
 .. _Form component: http://symfony.com/doc/current/components/form/introduction.html
+.. _CHANGELOG: https://github.com/symfony/symfony/blob/master/src/Symfony/Component/OptionsResolver/CHANGELOG.md#260
+.. _`read the Symfony 2.5 documentation`: http://symfony.com/doc/2.5/components/options_resolver.html