' : '
',
                $entity instanceof TextUrl => '',
                $entity instanceof Strike => '',
                $entity instanceof Underline => '',
                $entity instanceof Blockquote => '
',
                $entity instanceof Url => '',
                $entity instanceof Email => '',
                $entity instanceof Phone => '',
                $entity instanceof Mention => '',
                $entity instanceof Spoiler => $allowTelegramTags ? '' : '',
                $entity instanceof CustomEmoji => $allowTelegramTags ? '' : '',
                $entity instanceof MentionName => $allowTelegramTags ? '' : '',
                $entity instanceof InputMentionName => $allowTelegramTags ? '' : '',
                default => '',
            };
            $offset += $length;
            $insertions[$offset] = match (true) {
                $entity instanceof Bold => '',
                $entity instanceof Italic => '',
                $entity instanceof Code => '',
                $entity instanceof Pre => '
',
                $entity instanceof TextUrl, $entity instanceof Url, $entity instanceof Email, $entity instanceof Mention, $entity instanceof Phone => '',
                $entity instanceof Strike => '',
                $entity instanceof Underline => '',
                $entity instanceof Blockquote => '',
                $entity instanceof Spoiler => $allowTelegramTags ? '' : '',
                $entity instanceof CustomEmoji => $allowTelegramTags ? "" : '',
                $entity instanceof MentionName => $allowTelegramTags ? '' : '',
                $entity instanceof InputMentionName => $allowTelegramTags ? '' : '',
                default => '',
            } . ($insertions[$offset] ?? '');
        }
        ksort($insertions);
        $final = '';
        $pos = 0;
        foreach ($insertions as $offset => $insertion) {
            $final .= StrTools::htmlEscape(StrTools::mbSubstr($message, $pos, $offset-$pos));
            $final .= $insertion;
            $pos = $offset;
        }
        return str_replace("\n", "
", $final.StrTools::htmlEscape(StrTools::mbSubstr($message, $pos)));
    }
    /**
     * Convert to camelCase.
     *
     * @param string $input String
     */
    public static function toCamelCase(string $input): string
    {
        return lcfirst(str_replace('_', '', ucwords($input, '_')));
    }
    /**
     * Convert to snake_case.
     *
     * @param string $input String
     */
    public static function toSnakeCase(string $input): string
    {
        preg_match_all('!([A-Z][A-Z0-9]*(?=$|[A-Z][a-z0-9])|[A-Za-z][a-z0-9]+)!', $input, $matches);
        $ret = $matches[0];
        foreach ($ret as &$match) {
            $match = $match == strtoupper($match) ? strtolower($match) : lcfirst($match);
        }
        return implode('_', $ret);
    }
    /**
     * Escape string for MadelineProto's HTML entity converter.
     *
     * @param string $what String to escape
     */
    public static function htmlEscape(string $what): string
    {
        return htmlspecialchars($what, ENT_QUOTES|ENT_SUBSTITUTE|ENT_XML1);
    }
    /**
     * Escape string for markdown.
     *
     * @param string $what String to escape
     */
    public static function markdownEscape(string $what): string
    {
        return str_replace(
            [
                '\\',
                '_',
                '*',
                '[',
                ']',
                '(',
                ')',
                '~',
                '`',
                '>',
                '#',
                '+',
                '-',
                '=',
                '|',
                '{',
                '}',
                '.',
                '!',
            ],
            [
                '\\\\',
                '\\_',
                '\\*',
                '\\[',
                '\\]',
                '\\(',
                '\\)',
                '\\~',
                '\\`',
                '\\>',
                '\\#',
                '\\+',
                '\\-',
                '\\=',
                '\\|',
                '\\{',
                '\\}',
                '\\.',
                '\\!',
            ],
            $what
        );
    }
    /**
     * Escape string for markdown codeblock.
     *
     * @param string $what String to escape
     */
    public static function markdownCodeblockEscape(string $what): string
    {
        return str_replace('```', '\\```', $what);
    }
    /**
     * Escape string for markdown code section.
     *
     * @param string $what String to escape
     */
    public static function markdownCodeEscape(string $what): string
    {
        return str_replace('`', '\\`', $what);
    }
    /**
     * Escape string for URL.
     *
     * @param string $what String to escape
     */
    public static function markdownUrlEscape(string $what): string
    {
        return str_replace(')', '\\)', $what);
    }
    /**
     * Escape type name.
     *
     * @internal
     *
     * @param string $type String to escape
     */
    public static function typeEscape(string $type): string
    {
        $type = str_replace(['<', '>'], ['_of_', ''], $type);
        return preg_replace('/.*_of_/', '', $type);
    }
    /**
     * Escape method name.
     *
     * @internal
     *
     * @param string $method Method name
     */
    public static function methodEscape(string $method): string
    {
        return str_replace('.', '->', $method);
    }
    /**
     * Strip markdown tags.
     *
     * @internal
     */
    public static function toString(string $markdown): string
    {
        if ($markdown === '') {
            return $markdown;
        }
        try {
            return (new MarkdownEntities($markdown))->message;
        } catch (Throwable) {
            return (new MarkdownEntities(str_replace('_', '\\_', $markdown)))->message;
        }
    }
}