jidaikobo-shibata/a11yc

<?php
/**
 * * A11yc\Validate\Check\CssInvisibles
 *
 * @package    part of A11yc
 * @author     Jidaikobo Inc.
 * @license    The MIT License (MIT)
 * @copyright  Jidaikobo Inc.
 * @link       http://www.jidaikobo.com
 */
namespace A11yc\Validate\Check;

use A11yc\Element;
use A11yc\Validate;
use A11yc\Model;

class CssInvisibles extends Validate
{
    /**
     * check content
     *
     * @param String $url
     * @return Void
     */
    public static function check($url)
    {
        Validate\Set::log($url, 'css_invisible', self::$unspec, 5);
        Validate\Set::log($url, 'css_background_image_only', self::$unspec, 5);
        if ( ! static::$do_css_check) return;
        Validate\Set::log($url, 'css_invisible', self::$unspec, 1);
        Validate\Set::log($url, 'css_background_image_only', self::$unspec, 1);

        $csses = static::css($url);
        if (empty($csses))
        {
            Validate\Set::log($url, 'css_invisible', self::$unspec, 4);
            Validate\Set::log($url, 'css_background_image_only', self::$unspec, 4);
            return;
        }

        $is_exists_visible = false;
        $is_exists_bg = false;

        $k = 0;
        foreach ($csses as $each_csses)
        {
            foreach ($each_csses as $selector => $props)
            {
                // display, visibility
                $is_exists_visible = self::checkDisplayVisibility($url, $selector, $k, $props);

                // background-image without background-color
                $is_exists_bg = self::checkBgImageWithoutBgColor($url, $selector, $k, $props);
                $k++;
            }
        }

        if ( ! $is_exists_visible)
        {
            Validate\Set::log($url, 'css_invisible', self::$unspec, 4);
        }

        if ( ! $is_exists_bg)
        {
            Validate\Set::log($url, 'css_background_image_only', self::$unspec, 4);
        }
    }

    /**
     * check display properly and visibility property
     *
     * @param String  $url
     * @param String  $selector
     * @param Integer $k
     * @param Array   $props
     * @return Bool
     */
    private static function checkDisplayVisibility($url, $selector, $k, $props)
    {
        $is_exists_visible = false;
        if (
            (isset($props['display']) && $props['display'] == 'none') ||
            (isset($props['visibility']) && $props['visibility'] == 'hidden')
        )
        {
            $is_exists_visible = true;
            Validate\Set::error($url, 'css_invisible', $k, '', $selector);
        }
        return $is_exists_visible;
    }

    /**
     * check background-image without background-color
     *
     * @param String  $url
     * @param String  $selector
     * @param Integer $k
     * @param Array   $props
     * @return Bool
     */
    private static function checkBgImageWithoutBgColor($url, $selector, $k, $props)
    {
        $is_exists_bg = false;
        if (
            isset($props['background']) ||
            isset($props['background-image'])
        )
        {
            $background = Arr::get($props, 'background', '');
            $background_image = Arr::get($props, 'background-image', '');

            if (
                strpos($background, 'url') !== false ||
                strpos($background_image, 'url') !== false
            )
            {
                $is_exists_bg = true;
                if (
                    strpos($background, '#') === false &&
                    ! isset($props['background-color'])
                )
                {
                    Validate\Set::error($url, 'css_background_image_only', $k, '', $selector);
                }
            }
        }
        return $is_exists_bg;
    }
}