jidaikobo-shibata/a11yc

<?php
/**
 * * A11yc\Validate\Check\EmptyAltAttrOfImgInsideA
 *
 * @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;

class EmptyAltAttrOfImgInsideA extends Validate
{
    /**
     * empty alt attr of img inside a
     *
     * @param String $url
     * @return Void
     */
    public static function check($url)
    {
        Validate\Set::log($url, 'empty_alt_attr_of_img_inside_a', self::$unspec, 1);

        $str = Element\Get::ignoredHtml($url);

        $ms = Element\Get::elementsByRe($str, 'ignores', 'anchors_and_values');
        if ( ! $ms[2])
        {
            Validate\Set::log($url, 'empty_alt_attr_of_img_inside_a', self::$unspec, 4);
            return;
        }

        foreach ($ms[2] as $k => $m)
        {
            if (strpos($m, '<img') === false) continue; // without image
            if (Element::isIgnorable($ms[0][$k])) continue; // ignorable
            $t = trim(strip_tags($m)); // php <= 5.5 cannot use function return value
            if ( ! empty($t)) continue; // not image only

            $mms = Element\Get::elementsByRe($m, 'ignores', 'imgs', true);
            $alt = '';
            $src = '';
            foreach ($mms[0] as $in_img)
            {
                $attrs = Element\Get::attributes($in_img);
                $alt.= Arr::get($attrs, 'alt', '');
                $src = Arr::get($attrs, 'src', ''); // update by latest
            }
            $src = ! empty($src) ? Util::s(basename($src)) : '';

            $alt = trim($alt);
            $tstr = $ms[0][$k];

            if ( ! $alt)
            {
                Validate\Set::error($url, 'empty_alt_attr_of_img_inside_a', $k, $tstr, $src);
            }
            else
            {
                Validate\Set::log($url, 'empty_alt_attr_of_img_inside_a', $tstr, 2);
            }
        }

        static::addErrorToHtml($url, 'empty_alt_attr_of_img_inside_a', static::$error_ids[$url], 'ignores');
    }
}