initial commit of validation classes.

system/validation/rules/inclusion_of.php

@@ -0,0 +1,43 @@
+<?php namespace System\Validation\Rules;
+
+use System\Validation\Rule;
+
+class Inclusion_Of extends Rule {
+
+	/**
+	 * The accepted values for the attribute.
+	 *
+	 * @var string
+	 */
+	public $accepted;
+
+	/**
+	 * Evaluate the validity of an attribute.
+	 *
+	 * @param  string  $attribute
+	 * @param  array   $attributes
+	 * @return void
+	 */
+	public function check($attribute, $attributes)
+	{
+		if ( ! array_key_exists($attribute, $attributes))
+		{
+			return true;
+		}
+
+		return in_array($attributes[$attribute], $this->accepted);
+	}	
+
+	/**
+	 * Set the accepted values for the attribute.
+	 *
+	 * @param  array  $accepted
+	 * @return Inclusion_Of
+	 */
+	public function in($accepted)
+	{
+		$this->accepted = $accepted;
+		return $this;
+	}
+
+}