~friendica

redmatrix

redmatrix

 and  tags.
	 *
	 * @param string $text      An HTML string
	 * @param array  $smilies   An string replacement array with the following structure: ['texts' => [], 'icons' => []]
	 * @param bool   $no_images Only replace shortcodes without image replacement (e.g. Unicode characters)
	 * @return string
	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
	 */
	public static function replaceFromArray(string $text, array $smilies, bool $no_images = false): string
	{
		if (self::noSmilies()) {
			return $text;
		}

		$text = preg_replace_callback('/<(pre)>(.*?)<\/pre>/ism', [self::class, 'encode'], $text);
		$text = preg_replace_callback('/<(code)>(.*?)<\/code>/ism', [self::class, 'encode'], $text);

		if ($no_images) {
			$cleaned = ['texts' => [], 'icons' => []];
			$icons = $smilies['icons'];
			foreach ($icons as $key => $icon) {
				if (!strstr($icon, '(.*?)<\/code>/ism', [self::class, 'decode'], $text);
		$text = preg_replace_callback('/<(pre)>(.*?)<\/pre>/ism', [self::class, 'decode'], $text);

		return $text;
	}

	/**
	 * Encodes smiley match array to BASE64 string
	 *
	 * @param array $m Match array
	 * @return string base64 encoded string
	 */
	private static function encode(array $m): string
	{
		return '<' . $m[1] . '>' . Strings::base64UrlEncode($m[2]) . '';
	}

	/**
	 * Decodes a previously BASE64-encoded match array to a string
	 *
	 * @param array $m Matches array
	 * @return string base64 decoded string
	 * @throws \Exception
	 */
	private static function decode(array $m): string
	{
		return '<' . $m[1] . '>' . Strings::base64UrlDecode($m[2]) . '';
	}


	/**
	 * expand <3333 to the correct number of hearts
	 *
	 * @param array $matches
	 * @return string HTML Output
	 */
	private static function heartReplaceCallback(array $matches): string
	{
		return str_repeat('❤', strlen($matches[0]) - 4);
	}

	/**
	 * Checks if the body doesn't contain any alphanumeric characters
	 *
	 * @param string $body Possibly-HTML post body
	 * @return boolean
	 */
	public static function isEmojiPost(string $body): bool
	{
		// Strips all whitespace
		$conv = preg_replace('#\s#u', '', html_entity_decode($body));
		if (empty($conv)) {
			return false;
		}

		if (!class_exists('IntlChar')) {
			// Most Emojis are 4 byte Unicode characters, so this is a good workaround, when IntlChar does not exist on the system
			return strlen($conv) / mb_strlen($conv) == 4;
		}

		for ($i = 0; $i < mb_strlen($conv); $i++) {
			$character = mb_substr($conv, $i, 1);

			if (\IntlChar::isalnum($character) || \IntlChar::ispunct($character) || \IntlChar::isgraph($character) && (strlen($character) <= 2)) {
				return false;
			}
		}
		return true;
	}
}