laravel-package-forms/src/Attributes/DirectionAttribute.php

<?php

namespace Artmark\Forms\Attributes;

/**
 * Description of DirectionAttribute
 *
 * @author Andrey Pokidov <pokidov@e-traffic.ru>
 */
trait DirectionAttribute
{
    /**
     *
     * @var string
     */
    private $direction = '';
    
    /**
     * HTML dir attribute of the tag
     * @return string
     */
    public function direction()
    {
        return $this->direction;
    }
    
    /**
     * 
     * @return boolean
     */
    public function hasDirection()
    {
        return $this->direction !== '';
    }
    
    /**
     * 
     * @param string $newDirection
     * @return $this
     */
    public function setDirection($newDirection)
    {
        self::checkDirection($newDirection);
        
        $this->direction = self::normalizeString($newDirection);
        
        return $this;
    }
    
    /**
     * 
     * @return $this
     */
    public function removeDirection()
    {
        $this->direction = '';
        
        return $this;
    }
    
    protected function appendDirectionAttribute(array & $attributes)
    {
        if ($this->hasDirection())
        {
            $attributes['dir'] = $this->direction;
        }
    }
    
    public static function checkDirection($direction)
    {
        if (!self::isCorrectDirection($direction)) {
            throw new AttributeException('Incorrect direction value: `' . strval($direction) . '`');
        }
    }
    
    public static function isCorrectDirection($direction)
    {
        if (!is_string($direction)) {
            return false;
        }
        
        $corrected = self::normalizeString($direction);
        
        return $corrected === '' || $corrected === 'ltr' || $corrected === 'rtl';
    }
    
    private static function normalizeString($value)
    {
        return strtolower(trim($value));
    }
}