(.*?)!is', $html, $matches)) { return trim(str_replace("\n", '', $matches[1])); } return false; } /** * Extract charset from HTTP header if it's defined. * * @param string $header HTTP header Content-Type line. * * @return bool|string Charset string if found (lowercase), false otherwise. */ function header_extract_charset($header) { preg_match('/charset=["\']?([^; "\']+)/i', $header, $match); if (! empty($match[1])) { return strtolower(trim($match[1])); } return false; } /** * Extract charset HTML content (tag ). * * @param string $html HTML content where to look for charset. * * @return bool|string Charset string if found, false otherwise. */ function html_extract_charset($html) { // Get encoding specified in HTML header. preg_match('#/]+)["\']? */?>#Usi', $html, $enc); if (!empty($enc[1])) { return strtolower($enc[1]); } return false; } /** * Extract meta tag from HTML content in either: * - OpenGraph: * - Meta tag: * * @param string $tag Name of the tag to retrieve. * @param string $html HTML content where to look for charset. * * @return bool|string Charset string if found, false otherwise. */ function html_extract_tag($tag, $html) { $propertiesKey = ['property', 'name', 'itemprop']; $properties = implode('|', $propertiesKey); // We need a OR here to accept either 'property=og:noquote' or 'property="og:unrelated og:my-tag"' $orCondition = '["\']?(?:og:)?' . $tag . '["\']?|["\'][^\'"]*?(?:og:)?' . $tag . '[^\'"]*?[\'"]'; // Support quotes in double quoted content, and the other way around $content = 'content=(["\'])((?:(?!\1).)*)\1'; // Try to retrieve OpenGraph tag. $ogRegex = '#]+(?:' . $properties . ')=(?:' . $orCondition . ')[^>]*' . $content . '.*?>#'; // If the attributes are not in the order property => content (e.g. Github) // New regex to keep this readable... more or less. $ogRegexReverse = '#]+' . $content . '[^>]+(?:' . $properties . ')=(?:' . $orCondition . ').*?>#'; if ( preg_match($ogRegex, $html, $matches) > 0 || preg_match($ogRegexReverse, $html, $matches) > 0 ) { return $matches[2]; } return false; } /** * In a string, converts URLs to clickable bookmarks. * * @param string $text input string. * * @return string returns $text with all bookmarks converted to HTML bookmarks. * * @see Function inspired from http://www.php.net/manual/en/function.preg-replace.php#85722 */ function text2clickable($text) { $regex = '!(((?:https?|ftp|file)://|apt:|magnet:)\S+[a-z0-9\(\)]/?)!si'; return preg_replace($regex, '$1', $text); } /** * Auto-link hashtags. * * @param string $description Given description. * @param string $indexUrl Root URL. * * @return string Description with auto-linked hashtags. */ function hashtag_autolink($description, $indexUrl = '') { /* * To support unicode: http://stackoverflow.com/a/35498078/1484919 * \p{Pc} - to match underscore * \p{N} - numeric character in any script * \p{L} - letter from any language * \p{Mn} - any non marking space (accents, umlauts, etc) */ $regex = '/(^|\s)#([\p{Pc}\p{N}\p{L}\p{Mn}]+)/mui'; $replacement = '$1#$2'; return preg_replace($regex, $replacement, $description); } /** * This function inserts   where relevant so that multiple spaces are properly displayed in HTML * even in the absence of 
  (This is used in description to keep text formatting).
 *
 * @param string $text input text.
 *
 * @return string formatted text.
 */
function space2nbsp($text)
{
    return preg_replace('/(^| ) /m', '$1 ', $text);
}

/**
 * Format Shaarli's description
 *
 * @param string $description shaare's description.
 * @param string $indexUrl    URL to Shaarli's index.
 * @param bool   $autolink    Turn on/off automatic linkifications of URLs and hashtags
 *
 * @return string formatted description.
 */
function format_description($description, $indexUrl = '', $autolink = true)
{
    if ($autolink) {
        $description = hashtag_autolink(text2clickable($description), $indexUrl);
    }

    return nl2br(space2nbsp($description));
}

/**
 * Generate a small hash for a link.
 *
 * @param DateTime $date Link creation date.
 * @param int      $id   Link ID.
 *
 * @return string the small hash generated from link data.
 */
function link_small_hash($date, $id)
{
    return smallHash($date->format(Bookmark::LINK_DATE_FORMAT) . $id);
}

/**
 * Returns whether or not the link is an internal note.
 * Its URL starts by `?` because it's actually a permalink.
 *
 * @param string $linkUrl
 *
 * @return bool true if internal note, false otherwise.
 */
function is_note($linkUrl)
{
    return isset($linkUrl[0]) && $linkUrl[0] === '?';
}

/**
 * Extract an array of tags from a given tag string, with provided separator.
 *
 * @param string|null $tags      String containing a list of tags separated by $separator.
 * @param string      $separator Shaarli's default: ' ' (whitespace)
 *
 * @return array List of tags
 */
function tags_str2array(?string $tags, string $separator): array
{
    // For whitespaces, we use the special \s regex character
    $separator = $separator === ' ' ? '\s' : $separator;

    return preg_split('/\s*' . $separator . '+\s*/', trim($tags) ?? '', -1, PREG_SPLIT_NO_EMPTY);
}

/**
 * Return a tag string with provided separator from a list of tags.
 * Note that given array is clean up by tags_filter().
 *
 * @param array|null $tags      List of tags
 * @param string     $separator
 *
 * @return string
 */
function tags_array2str(?array $tags, string $separator): string
{
    return implode($separator, tags_filter($tags, $separator));
}

/**
 * Clean an array of tags: trim + remove empty entries
 *
 * @param array|null $tags List of tags
 * @param string     $separator
 *
 * @return array
 */
function tags_filter(?array $tags, string $separator): array
{
    $trimDefault = " \t\n\r\0\x0B";
    return array_values(array_filter(array_map(function (string $entry) use ($separator, $trimDefault): string {
        return trim($entry, $trimDefault . $separator);
    }, $tags ?? [])));
}