Create a Factory to create rules

It also provide a way to define namespaces/prefixes to use the custom
rules on Respect\Validation.

README.md

@@ -174,6 +174,23 @@ $errors = $exception->findMessages(array(
 
 For all messages, the `{{name}}` and `{{input}}` variable is available for templates.
 
+### Custom Rules
+
+You also can use your own rules:
+
+```php
+v::with('My\\Validation\\Rules\\');
+v::myRule(); // Try to load "My\Validation\Rules\MyRule" if any
+```
+
+By default `with()` appends the given prefix, but you can change this behavior
+in order to overwrite default rules:
+
+```php
+v::with('My\\Validation\\Rules\\', true);
+v::alnum(); // Try to use "My\Validation\Rules\Alnum" if any
+```
+
 ### Validator Name
 
 On `v::attribute()` and `v::key()`, `{{name}}` is the attribute/key name. For others,

library/Factory.php

@@ -0,0 +1,49 @@
+<?php
+
+namespace Respect\Validation;
+
+use ReflectionClass;
+use Respect\Validation\Exceptions\ComponentException;
+
+class Factory
+{
+    protected $rulePrefixes = array('Respect\\Validation\\Rules\\');
+
+    public function getRulePrefixes()
+    {
+        return $this->rulePrefixes;
+    }
+
+    public function appendRulePrefix($rulePrefix)
+    {
+        array_push($this->rulePrefixes, $rulePrefix);
+    }
+
+    public function prependRulePrefix($rulePrefix)
+    {
+        array_unshift($this->rulePrefixes, $rulePrefix);
+    }
+
+    public function rule($ruleName, array $arguments = array())
+    {
+        if ($ruleName instanceof Validatable) {
+            return $ruleName;
+        }
+
+        foreach ($this->getRulePrefixes() as $prefix) {
+            $className = $prefix.ucfirst($ruleName);
+            if (! class_exists($className)) {
+                continue;
+            }
+
+            $reflection = new ReflectionClass($className);
+            if (! $reflection->isSubclassOf('Respect\\Validation\\Validatable')) {
+                throw new ComponentException(sprintf('"%s" is not a valid respect rule', $className));
+            }
+
+            return $reflection->newInstanceArgs($arguments);
+        }
+
+        throw new ComponentException(sprintf('"%s" is not a valid rule name', $ruleName));
+    }
+}

library/Validator.php

@@ -106,6 +106,45 @@ use Respect\Validation\Rules\AllOf;
  */
 class Validator extends AllOf
 {
+    protected static $factory;
+
+    /**
+     * @return Factory
+     */
+    protected static function getFactory()
+    {
+        if (! static::$factory instanceof Factory) {
+            static::$factory = new Factory();
+        }
+
+        return static::$factory;
+    }
+
+    /**
+     * @param Factory $factory
+     *
+     * @return null
+     */
+    public static function setFactory($factory)
+    {
+        static::$factory = $factory;
+    }
+
+    /**
+     * @param string $rulePrefix
+     * @param bool   $prepend
+     *
+     * @return null
+     */
+    public static function with($rulePrefix, $prepend = false)
+    {
+        if (false === $prepend) {
+            self::getFactory()->appendRulePrefix($rulePrefix);
+        } else {
+            self::getFactory()->prependRulePrefix($rulePrefix);
+        }
+    }
+
     /**
      * @param string $ruleName
      * @param array  $arguments
@@ -131,18 +170,10 @@ class Validator extends AllOf
      */
     public static function buildRule($ruleSpec, $arguments = array())
     {
-        if ($ruleSpec instanceof Validatable) {
-            return $ruleSpec;
-        }
-
         try {
-            $validatorFqn = 'Respect\\Validation\\Rules\\'.ucfirst($ruleSpec);
-            $validatorClass = new ReflectionClass($validatorFqn);
-            $validatorInstance = $validatorClass->newInstanceArgs($arguments);
-
-            return $validatorInstance;
-        } catch (ReflectionException $e) {
-            throw new ComponentException($e->getMessage());
+            return static::getFactory()->rule($ruleSpec, $arguments);
+        } catch (\Exception $exception) {
+            throw new ComponentException($exception->getMessage(), $exception->getCode(), $exception);
         }
     }
 

tests/FactoryTest.php

@@ -0,0 +1,72 @@
+<?php
+
+namespace Respect\Validation;
+
+/**
+ * @covers Respect\Validation\Factory
+ */
+class FactoryTest extends \PHPUnit_Framework_TestCase
+{
+    public function testShouldHaveRulePrefixesByDefault()
+    {
+        $factory = new Factory();
+
+        $this->assertEquals(array('Respect\\Validation\\Rules\\'), $factory->getRulePrefixes());
+    }
+
+    public function testShouldBeAbleToAppendANewPrefix()
+    {
+        $factory = new Factory();
+        $factory->appendRulePrefix('My\\Validation\\Rules\\');
+
+        $this->assertEquals(array('Respect\\Validation\\Rules\\', 'My\\Validation\\Rules\\'), $factory->getRulePrefixes());
+    }
+
+    public function testShouldBeAbleToPrependANewRulePrefix()
+    {
+        $factory = new Factory();
+        $factory->prependRulePrefix('My\\Validation\\Rules\\');
+
+        $this->assertEquals(array('My\\Validation\\Rules\\', 'Respect\\Validation\\Rules\\'), $factory->getRulePrefixes());
+    }
+
+    public function testShouldCreateARuleByName()
+    {
+        $factory = new Factory();
+
+        $this->assertInstanceOf('Respect\\Validation\\Rules\\Uppercase', $factory->rule('uppercase'));
+    }
+
+    public function testShouldDefineConstructorArgumentsWhenCreatingARule()
+    {
+        $factory = new Factory();
+        $rule = $factory->rule('date', array('Y-m-d'));
+
+        $this->assertEquals('Y-m-d', $rule->format);
+    }
+
+    /**
+     * @expectedException Respect\Validation\Exceptions\ComponentException
+     * @expectedExceptionMessage "uterere" is not a valid rule name
+     */
+    public function testShouldThrowsAnExceptionWhenRuleNameIsNotValid()
+    {
+        $factory = new Factory();
+        $factory->rule('uterere');
+    }
+
+    /**
+     * @expectedException Respect\Validation\Exceptions\ComponentException
+     * @expectedExceptionMessage "Respect\Validation\TestNonRule" is not a valid respect rule
+     */
+    public function testShouldThrowsAnExceptionWhenRuleIsNotInstanceOfRuleInterface()
+    {
+        $factory = new Factory();
+        $factory->appendRulePrefix('Respect\\Validation\\Test');
+        $factory->rule('nonRule');
+    }
+}
+
+class TestNonRule
+{
+}