00d3dd91ef
Previous regex forced the selection to stop at either the first single or double quote found, regardless of the opening quote. Using '\1', we're sure to wait for the proper quote before stopping the capture.
178 lines
5.1 KiB
PHP
178 lines
5.1 KiB
PHP
<?php
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use Shaarli\Bookmark\Bookmark;
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/**
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* Extract title from an HTML document.
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*
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* @param string $html HTML content where to look for a title.
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*
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* @return bool|string Extracted title if found, false otherwise.
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*/
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function html_extract_title($html)
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{
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if (preg_match('!<title.*?>(.*?)</title>!is', $html, $matches)) {
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return trim(str_replace("\n", '', $matches[1]));
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}
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return false;
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}
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/**
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* Extract charset from HTTP header if it's defined.
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*
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* @param string $header HTTP header Content-Type line.
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*
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* @return bool|string Charset string if found (lowercase), false otherwise.
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*/
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function header_extract_charset($header)
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{
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preg_match('/charset=["\']?([^; "\']+)/i', $header, $match);
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if (! empty($match[1])) {
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return strtolower(trim($match[1]));
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}
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return false;
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}
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/**
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* Extract charset HTML content (tag <meta charset>).
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*
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* @param string $html HTML content where to look for charset.
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*
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* @return bool|string Charset string if found, false otherwise.
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*/
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function html_extract_charset($html)
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{
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// Get encoding specified in HTML header.
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preg_match('#<meta .*charset=["\']?([^";\'>/]+)["\']? */?>#Usi', $html, $enc);
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if (!empty($enc[1])) {
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return strtolower($enc[1]);
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}
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return false;
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}
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/**
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* Extract meta tag from HTML content in either:
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* - OpenGraph: <meta property="og:[tag]" ...>
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* - Meta tag: <meta name="[tag]" ...>
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*
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* @param string $tag Name of the tag to retrieve.
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* @param string $html HTML content where to look for charset.
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*
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* @return bool|string Charset string if found, false otherwise.
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*/
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function html_extract_tag($tag, $html)
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{
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$propertiesKey = ['property', 'name', 'itemprop'];
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$properties = implode('|', $propertiesKey);
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// We need a OR here to accept either 'property=og:noquote' or 'property="og:unrelated og:my-tag"'
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$orCondition = '["\']?(?:og:)?'. $tag .'["\']?|["\'][^\'"]*?(?:og:)?' . $tag . '[^\'"]*?[\'"]';
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// Try to retrieve OpenGraph tag.
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$ogRegex = '#<meta[^>]+(?:'. $properties .')=(?:'. $orCondition .')[^>]*content=(["\'])([^\1]*?)\1.*?>#';
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// If the attributes are not in the order property => content (e.g. Github)
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// New regex to keep this readable... more or less.
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$ogRegexReverse = '#<meta[^>]+content=(["\'])([^\1]*?)\1[^>]+(?:'. $properties .')=(?:'. $orCondition .').*?>#';
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if (preg_match($ogRegex, $html, $matches) > 0
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|| preg_match($ogRegexReverse, $html, $matches) > 0
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) {
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return $matches[2];
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}
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return false;
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}
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/**
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* In a string, converts URLs to clickable bookmarks.
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*
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* @param string $text input string.
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*
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* @return string returns $text with all bookmarks converted to HTML bookmarks.
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*
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* @see Function inspired from http://www.php.net/manual/en/function.preg-replace.php#85722
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*/
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function text2clickable($text)
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{
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$regex = '!(((?:https?|ftp|file)://|apt:|magnet:)\S+[a-z0-9\(\)]/?)!si';
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return preg_replace($regex, '<a href="$1">$1</a>', $text);
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}
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/**
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* Auto-link hashtags.
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*
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* @param string $description Given description.
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* @param string $indexUrl Root URL.
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*
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* @return string Description with auto-linked hashtags.
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*/
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function hashtag_autolink($description, $indexUrl = '')
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{
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/*
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* To support unicode: http://stackoverflow.com/a/35498078/1484919
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* \p{Pc} - to match underscore
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* \p{N} - numeric character in any script
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* \p{L} - letter from any language
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* \p{Mn} - any non marking space (accents, umlauts, etc)
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*/
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$regex = '/(^|\s)#([\p{Pc}\p{N}\p{L}\p{Mn}]+)/mui';
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$replacement = '$1<a href="'. $indexUrl .'./add-tag/$2" title="Hashtag $2">#$2</a>';
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return preg_replace($regex, $replacement, $description);
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}
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/**
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* This function inserts where relevant so that multiple spaces are properly displayed in HTML
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* even in the absence of <pre> (This is used in description to keep text formatting).
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*
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* @param string $text input text.
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*
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* @return string formatted text.
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*/
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function space2nbsp($text)
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{
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return preg_replace('/(^| ) /m', '$1 ', $text);
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}
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/**
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* Format Shaarli's description
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*
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* @param string $description shaare's description.
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* @param string $indexUrl URL to Shaarli's index.
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* @param bool $autolink Turn on/off automatic linkifications of URLs and hashtags
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*
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* @return string formatted description.
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*/
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function format_description($description, $indexUrl = '', $autolink = true)
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{
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if ($autolink) {
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$description = hashtag_autolink(text2clickable($description), $indexUrl);
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}
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return nl2br(space2nbsp($description));
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}
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/**
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* Generate a small hash for a link.
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*
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* @param DateTime $date Link creation date.
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* @param int $id Link ID.
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*
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* @return string the small hash generated from link data.
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*/
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function link_small_hash($date, $id)
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{
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return smallHash($date->format(Bookmark::LINK_DATE_FORMAT) . $id);
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}
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/**
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* Returns whether or not the link is an internal note.
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* Its URL starts by `?` because it's actually a permalink.
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*
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* @param string $linkUrl
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*
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* @return bool true if internal note, false otherwise.
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*/
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function is_note($linkUrl)
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{
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return isset($linkUrl[0]) && $linkUrl[0] === '?';
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}
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