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- <?php
- /**
- * Extract title from an HTML document.
- *
- * @param string $html HTML content where to look for a title.
- *
- * @return bool|string Extracted title if found, false otherwise.
- */
- function html_extract_title($html)
- {
- if (preg_match('!<title.*?>(.*?)</title>!is', $html, $matches)) {
- return trim(str_replace("\n", '', $matches[1]));
- }
- return false;
- }
- /**
- * Determine charset from downloaded page.
- * Priority:
- * 1. HTTP headers (Content type).
- * 2. HTML content page (tag <meta charset>).
- * 3. Use a default charset (default: UTF-8).
- *
- * @param array $headers HTTP headers array.
- * @param string $htmlContent HTML content where to look for charset.
- * @param string $defaultCharset Default charset to apply if other methods failed.
- *
- * @return string Determined charset.
- */
- function get_charset($headers, $htmlContent, $defaultCharset = 'utf-8')
- {
- if ($charset = headers_extract_charset($headers)) {
- return $charset;
- }
- if ($charset = html_extract_charset($htmlContent)) {
- return $charset;
- }
- return $defaultCharset;
- }
- /**
- * Extract charset from HTTP headers if it's defined.
- *
- * @param array $headers HTTP headers array.
- *
- * @return bool|string Charset string if found (lowercase), false otherwise.
- */
- function headers_extract_charset($headers)
- {
- if (! empty($headers['Content-Type']) && strpos($headers['Content-Type'], 'charset=') !== false) {
- preg_match('/charset="?([^; ]+)/i', $headers['Content-Type'], $match);
- if (! empty($match[1])) {
- return strtolower(trim($match[1]));
- }
- }
- return false;
- }
- /**
- * Extract charset HTML content (tag <meta charset>).
- *
- * @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('#<meta .*charset=["\']?([^";\'>/]+)["\']? */?>#Usi', $html, $enc);
- if (!empty($enc[1])) {
- return strtolower($enc[1]);
- }
- return false;
- }
- /**
- * Count private links in given linklist.
- *
- * @param array|Countable $links Linklist.
- *
- * @return int Number of private links.
- */
- function count_private($links)
- {
- $cpt = 0;
- foreach ($links as $link) {
- if ($link['private']) {
- $cpt += 1;
- }
- }
- return $cpt;
- }
- /**
- * In a string, converts URLs to clickable links.
- *
- * @param string $text input string.
- * @param string $redirector if a redirector is set, use it to gerenate links.
- *
- * @return string returns $text with all links converted to HTML links.
- *
- * @see Function inspired from http://www.php.net/manual/en/function.preg-replace.php#85722
- */
- function text2clickable($text, $redirector = '')
- {
- $regex = '!(((?:https?|ftp|file)://|apt:|magnet:)\S+[[:alnum:]]/?)!si';
- if (empty($redirector)) {
- return preg_replace($regex, '<a href="$1">$1</a>', $text);
- }
- // Redirector is set, urlencode the final URL.
- return preg_replace_callback(
- $regex,
- function ($matches) use ($redirector) {
- return '<a href="' . $redirector . urlencode($matches[1]) .'">'. $matches[1] .'</a>';
- },
- $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<a href="'. $indexUrl .'?addtag=$2" title="Hashtag $2">#$2</a>';
- return preg_replace($regex, $replacement, $description);
- }
- /**
- * This function inserts where relevant so that multiple spaces are properly displayed in HTML
- * even in the absence of <pre> (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 $redirector if a redirector is set, use it to gerenate links.
- * @param string $indexUrl URL to Shaarli's index.
- *
- * @return string formatted description.
- */
- function format_description($description, $redirector = '', $indexUrl = '') {
- return nl2br(space2nbsp(hashtag_autolink(text2clickable($description, $redirector), $indexUrl)));
- }
- /**
- * 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(LinkDB::LINK_DATE_FORMAT) . $id);
- }
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