Add uppercase and lowercase rule

Author: phannaly

README.md

@@ -272,6 +272,8 @@ Below is list of all available validation rules
 * [uploaded_file](#rule-uploaded_file)
 * [default/defaults](#rule-default)
 * [email](#rule-email)
+* [uppercase](#rule-uppercase)
+* [lowercase](#rule-lowercase)
 * [alpha](#rule-alpha)
 * [numeric](#rule-numeric)
 * [alpha_num](#rule-alpha_num)
@@ -392,6 +394,16 @@ Validation passes because we sets default value for `enabled` and `published` to
 
 The field under this validation must be valid email address.
 
+<a id="rule-uppercase"></a>
+#### uppercase
+
+The field under this validation must be valid uppercase.
+
+<a id="rule-lowercase"></a>
+#### lowercase
+
+The field under this validation must be valid lowercase.
+
 <a id="rule-alpha"></a>
 #### alpha
 

src/Rules/Lowercase.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace Rakit\Validation\Rules;
+
+use Rakit\Validation\Rule;
+
+class Lowercase extends Rule
+{
+
+    protected $message = "The :attribute must be lowercase";
+
+    public function check($value)
+    {
+    	return mb_strtolower($value, mb_detect_encoding($value)) === $value;
+    }
+
+}

src/Rules/Uppercase.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace Rakit\Validation\Rules;
+
+use Rakit\Validation\Rule;
+
+class Uppercase extends Rule
+{
+
+    protected $message = "The :attribute must be uppercase";
+
+    public function check($value)
+    {
+    	return mb_strtoupper($value, mb_detect_encoding($value)) === $value;
+    }
+
+}

src/Validator.php

@@ -104,6 +104,8 @@ protected function registerBaseValidators()
             'callback'                  => new Rules\Callback,
             'before'                    => new Rules\Before,
             'after'                     => new Rules\After,
+            'lowercase'                 => new Rules\Lowercase,
+            'uppercase'                 => new Rules\Uppercase,
             'defaults'                  => new Rules\Defaults,
             'default'                   => new Rules\Defaults, // alias of defaults
         ];

tests/Rules/LowercaseTest.php

@@ -0,0 +1,27 @@
+<?php
+
+use Rakit\Validation\Rules\Lowercase;
+
+class LowercaseTest extends PHPUnit_Framework_TestCase
+{
+
+    public function setUp()
+    {
+        $this->rule = new Lowercase;
+    }
+
+    public function testValids()
+    {
+        $this->assertTrue($this->rule->check('username'));
+        $this->assertTrue($this->rule->check('full name'));
+        $this->assertTrue($this->rule->check('full_name'));
+    }
+
+    public function testInvalids()
+    {
+        $this->assertFalse($this->rule->check('USERNAME'));
+        $this->assertFalse($this->rule->check('Username'));
+        $this->assertFalse($this->rule->check('userName'));
+    }
+
+}

tests/Rules/UppercaseTest.php

@@ -0,0 +1,27 @@
+<?php
+
+use Rakit\Validation\Rules\Uppercase;
+
+class UppercaseTest extends PHPUnit_Framework_TestCase
+{
+
+    public function setUp()
+    {
+        $this->rule = new Uppercase;
+    }
+
+    public function testValids()
+    {
+        $this->assertTrue($this->rule->check('USERNAME'));
+        $this->assertTrue($this->rule->check('FULL NAME'));
+        $this->assertTrue($this->rule->check('FULL_NAME'));
+    }
+
+    public function testInvalids()
+    {
+        $this->assertFalse($this->rule->check('username'));
+        $this->assertFalse($this->rule->check('Username'));
+        $this->assertFalse($this->rule->check('userName'));
+    }
+
+}