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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) {
$cpt = $link['private'] == true ? $cpt + 1 : $cpt;
}
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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