Fuel widget password

widget_password.php

<?php

namespace Cms;

class Widget_Password extends \Fieldset_Field {
    
    /**
     * @var \Cms\Fieldset_Field
     */
    protected $password;
    
    /**
     * @var \Cms\Fieldset_Field
     */
    protected $verification;
    
    protected $display = array();
    
    /**
     * 
     * @param  string  $name
     * @param  string  $label
     * @param  array   $attributes
     * @param  array   $rules
     * @param  \Fuel\Core\Fieldset  $fieldset
     * @return  Cms\Widget_Date
     */
    public function __construct($name, $label = '', array $attributes = array(), array $rules = array(), \Fuel\Core\Fieldset $fieldset) {
        parent::__construct(uniqid(), '', array(), array(), $fieldset);
        
        $this->display[] = new \Fieldset_Field($name, $label, $attributes, array(), $fieldset);
        $this->display[] = new \Fieldset_Field($name.'_verification', $label.' (confirmation)', $attributes, array(), $fieldset);
        
        // Purpose of empty widget is validation!
        $this->password = $fieldset->add_field(new Widget_Empty($name, '', array(), $rules, $fieldset));
        
        $this->verification = $fieldset->add_field(new Widget_Empty($name.'_verification', '', array(), array(), $fieldset))
                                       ->add_rule('match_field', $name);
    }
    
    public function add_rule($callback) {
        // Relay all validation rules to the password
        call_user_func_array(array($this->password, 'add_rule'), func_get_args());
        if ($callback == 'required') {
            call_user_func_array(array($this->verification, 'add_rule'), func_get_args());
        }
    }
    
    /**
     * How to display the field
     * @return type 
     */
    public function build() {
        return implode('', $this->display);
    }
    
    public function repopulate(array $input) {
        list($password, $verification) = array($input[$this->password->name], $input[$this->verification->name]);
        
        // Remember previous entered values        
        if (!empty($password)) {
            $this->password->set_value($password);
            $this->display[0]->set_value($password);
        }
        if (!empty($verification)) {
            $this->verification->set_value($verification);
            $this->display[1]->set_value($verification);
        }
    }
    
}