<?php

if (!defined('ABSPATH')) {
    exit;
}

class AdGhost_Protected_Elements {

    const TAGS = [
        'ul', 'ol', 'table', 'blockquote', 'figure', 'pre', 'code',
        'form', 'aside', 'nav', 'header', 'footer', 'address', 'audio',
        'canvas', 'caption', 'details', 'dl', 'dt', 'dd', 'fieldset',
        'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'iframe', 'label', 'legend',
        'menu', 'noscript', 'object', 'script', 'select', 'style',
        'summary', 'textarea', 'video',
    ];

    public static function all() {
        return self::TAGS;
    }

    public static function is_inside($content, $offset) {
        $before = substr($content, 0, $offset);
        foreach (self::TAGS as $tag) {
            $open = preg_match_all("/<{$tag}[\s>]/i", $before);
            $close = preg_match_all("/<\/{$tag}>/i", $before);
            if ($open > $close) {
                return true;
            }
        }
        return false;
    }
}