b3bd8c3e8d
So it allows to have multiple words tags. Breaking change: commas ',' are no longer a default separator. Fixes #594
570 lines
20 KiB
PHP
570 lines
20 KiB
PHP
<?php
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declare(strict_types=1);
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namespace Shaarli\Bookmark;
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use Exception;
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use Shaarli\Bookmark\Exception\BookmarkNotFoundException;
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use Shaarli\Config\ConfigManager;
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/**
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* Class LinkFilter.
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*
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* Perform search and filter operation on link data list.
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*/
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class BookmarkFilter
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{
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/**
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* @var string permalinks.
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*/
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public static $FILTER_HASH = 'permalink';
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/**
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* @var string text search.
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*/
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public static $FILTER_TEXT = 'fulltext';
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/**
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* @var string tag filter.
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*/
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public static $FILTER_TAG = 'tags';
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/**
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* @var string filter by day.
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*/
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public static $FILTER_DAY = 'FILTER_DAY';
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/**
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* @var string filter by day.
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*/
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public static $DEFAULT = 'NO_FILTER';
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/** @var string Visibility: all */
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public static $ALL = 'all';
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/** @var string Visibility: public */
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public static $PUBLIC = 'public';
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/** @var string Visibility: private */
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public static $PRIVATE = 'private';
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/**
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* @var string Allowed characters for hashtags (regex syntax).
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*/
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public static $HASHTAG_CHARS = '\p{Pc}\p{N}\p{L}\p{Mn}';
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/**
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* @var Bookmark[] all available bookmarks.
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*/
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private $bookmarks;
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/** @var ConfigManager */
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protected $conf;
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/**
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* @param Bookmark[] $bookmarks initialization.
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*/
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public function __construct($bookmarks, ConfigManager $conf)
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{
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$this->bookmarks = $bookmarks;
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$this->conf = $conf;
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}
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/**
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* Filter bookmarks according to parameters.
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*
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* @param string $type Type of filter (eg. tags, permalink, etc.).
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* @param mixed $request Filter content.
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* @param bool $casesensitive Optional: Perform case sensitive filter if true.
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* @param string $visibility Optional: return only all/private/public bookmarks
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* @param bool $untaggedonly Optional: return only untagged bookmarks. Applies only if $type includes FILTER_TAG
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*
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* @return Bookmark[] filtered bookmark list.
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*
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* @throws BookmarkNotFoundException
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*/
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public function filter(
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string $type,
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$request,
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bool $casesensitive = false,
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string $visibility = 'all',
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bool $untaggedonly = false
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) {
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if (!in_array($visibility, ['all', 'public', 'private'])) {
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$visibility = 'all';
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}
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switch ($type) {
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case self::$FILTER_HASH:
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return $this->filterSmallHash($request);
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case self::$FILTER_TAG | self::$FILTER_TEXT: // == "vuotext"
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$noRequest = empty($request) || (empty($request[0]) && empty($request[1]));
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if ($noRequest) {
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if ($untaggedonly) {
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return $this->filterUntagged($visibility);
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}
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return $this->noFilter($visibility);
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}
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if ($untaggedonly) {
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$filtered = $this->filterUntagged($visibility);
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} else {
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$filtered = $this->bookmarks;
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}
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if (!empty($request[0])) {
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$filtered = (new BookmarkFilter($filtered, $this->conf))
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->filterTags($request[0], $casesensitive, $visibility)
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;
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}
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if (!empty($request[1])) {
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$filtered = (new BookmarkFilter($filtered, $this->conf))
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->filterFulltext($request[1], $visibility)
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;
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}
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return $filtered;
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case self::$FILTER_TEXT:
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return $this->filterFulltext($request, $visibility);
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case self::$FILTER_TAG:
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if ($untaggedonly) {
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return $this->filterUntagged($visibility);
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} else {
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return $this->filterTags($request, $casesensitive, $visibility);
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}
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case self::$FILTER_DAY:
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return $this->filterDay($request, $visibility);
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default:
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return $this->noFilter($visibility);
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}
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}
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/**
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* Unknown filter, but handle private only.
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*
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* @param string $visibility Optional: return only all/private/public bookmarks
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*
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* @return Bookmark[] filtered bookmarks.
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*/
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private function noFilter(string $visibility = 'all')
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{
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if ($visibility === 'all') {
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return $this->bookmarks;
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}
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$out = array();
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foreach ($this->bookmarks as $key => $value) {
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if ($value->isPrivate() && $visibility === 'private') {
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$out[$key] = $value;
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} elseif (!$value->isPrivate() && $visibility === 'public') {
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$out[$key] = $value;
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}
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}
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return $out;
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}
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/**
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* Returns the shaare corresponding to a smallHash.
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*
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* @param string $smallHash permalink hash.
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*
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* @return Bookmark[] $filtered array containing permalink data.
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*
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* @throws BookmarkNotFoundException if the smallhash doesn't match any link.
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*/
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private function filterSmallHash(string $smallHash)
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{
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foreach ($this->bookmarks as $key => $l) {
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if ($smallHash == $l->getShortUrl()) {
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// Yes, this is ugly and slow
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return [$key => $l];
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}
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}
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throw new BookmarkNotFoundException();
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}
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/**
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* Returns the list of bookmarks corresponding to a full-text search
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*
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* Searches:
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* - in the URLs, title and description;
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* - are case-insensitive;
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* - terms surrounded by quotes " are exact terms search.
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* - terms starting with a dash - are excluded (except exact terms).
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*
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* Example:
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* print_r($mydb->filterFulltext('hollandais'));
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*
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* mb_convert_case($val, MB_CASE_LOWER, 'UTF-8')
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* - allows to perform searches on Unicode text
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* - see https://github.com/shaarli/Shaarli/issues/75 for examples
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*
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* @param string $searchterms search query.
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* @param string $visibility Optional: return only all/private/public bookmarks.
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*
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* @return Bookmark[] search results.
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*/
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private function filterFulltext(string $searchterms, string $visibility = 'all')
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{
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if (empty($searchterms)) {
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return $this->noFilter($visibility);
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}
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$filtered = [];
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$search = mb_convert_case(html_entity_decode($searchterms), MB_CASE_LOWER, 'UTF-8');
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$exactRegex = '/"([^"]+)"/';
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// Retrieve exact search terms.
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preg_match_all($exactRegex, $search, $exactSearch);
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$exactSearch = array_values(array_filter($exactSearch[1]));
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// Remove exact search terms to get AND terms search.
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$explodedSearchAnd = explode(' ', trim(preg_replace($exactRegex, '', $search)));
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$explodedSearchAnd = array_values(array_filter($explodedSearchAnd));
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// Filter excluding terms and update andSearch.
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$excludeSearch = [];
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$andSearch = [];
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foreach ($explodedSearchAnd as $needle) {
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if ($needle[0] == '-' && strlen($needle) > 1) {
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$excludeSearch[] = substr($needle, 1);
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} else {
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$andSearch[] = $needle;
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}
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}
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// Iterate over every stored link.
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foreach ($this->bookmarks as $id => $link) {
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// ignore non private bookmarks when 'privatonly' is on.
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if ($visibility !== 'all') {
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if (!$link->isPrivate() && $visibility === 'private') {
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continue;
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} elseif ($link->isPrivate() && $visibility === 'public') {
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continue;
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}
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}
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$lengths = [];
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$content = $this->buildFullTextSearchableLink($link, $lengths);
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// Be optimistic
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$found = true;
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$foundPositions = [];
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// First, we look for exact term search
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// Then iterate over keywords, if keyword is not found,
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// no need to check for the others. We want all or nothing.
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foreach ([$exactSearch, $andSearch] as $search) {
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for ($i = 0; $i < count($search) && $found !== false; $i++) {
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$found = mb_strpos($content, $search[$i]);
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if ($found === false) {
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break;
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}
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$foundPositions[] = ['start' => $found, 'end' => $found + mb_strlen($search[$i])];
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}
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}
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// Exclude terms.
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for ($i = 0; $i < count($excludeSearch) && $found !== false; $i++) {
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$found = strpos($content, $excludeSearch[$i]) === false;
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}
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if ($found !== false) {
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$link->addAdditionalContentEntry(
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'search_highlight',
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$this->postProcessFoundPositions($lengths, $foundPositions)
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);
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$filtered[$id] = $link;
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}
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}
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return $filtered;
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}
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/**
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* generate a regex fragment out of a tag
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*
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* @param string $tag to to generate regexs from. may start with '-' to negate, contain '*' as wildcard
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*
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* @return string generated regex fragment
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*/
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protected function tag2regex(string $tag): string
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{
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$tagsSeparator = $this->conf->get('general.tags_separator', ' ');
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$len = strlen($tag);
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if (!$len || $tag === "-" || $tag === "*") {
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// nothing to search, return empty regex
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return '';
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}
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if ($tag[0] === "-") {
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// query is negated
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$i = 1; // use offset to start after '-' character
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$regex = '(?!'; // create negative lookahead
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} else {
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$i = 0; // start at first character
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$regex = '(?='; // use positive lookahead
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}
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// before tag may only be the separator or the beginning
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$regex .= '.*(?:^|' . $tagsSeparator . ')';
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// iterate over string, separating it into placeholder and content
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for (; $i < $len; $i++) {
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if ($tag[$i] === '*') {
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// placeholder found
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$regex .= '[^' . $tagsSeparator . ']*?';
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} else {
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// regular characters
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$offset = strpos($tag, '*', $i);
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if ($offset === false) {
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// no placeholder found, set offset to end of string
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$offset = $len;
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}
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// subtract one, as we want to get before the placeholder or end of string
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$offset -= 1;
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// we got a tag name that we want to search for. escape any regex characters to prevent conflicts.
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$regex .= preg_quote(substr($tag, $i, $offset - $i + 1), '/');
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// move $i on
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$i = $offset;
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}
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}
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// after the tag may only be the separator or the end
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$regex .= '(?:$|' . $tagsSeparator . '))';
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return $regex;
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}
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/**
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* Returns the list of bookmarks associated with a given list of tags
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*
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* You can specify one or more tags, separated by space or a comma, e.g.
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* print_r($mydb->filterTags('linux programming'));
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*
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* @param string|array $tags list of tags, separated by commas or blank spaces if passed as string.
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* @param bool $casesensitive ignore case if false.
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* @param string $visibility Optional: return only all/private/public bookmarks.
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*
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* @return Bookmark[] filtered bookmarks.
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*/
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public function filterTags($tags, bool $casesensitive = false, string $visibility = 'all')
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{
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$tagsSeparator = $this->conf->get('general.tags_separator', ' ');
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// get single tags (we may get passed an array, even though the docs say different)
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$inputTags = $tags;
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if (!is_array($tags)) {
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// we got an input string, split tags
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$inputTags = tags_str2array($inputTags, $tagsSeparator);
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}
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if (count($inputTags) === 0) {
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// no input tags
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return $this->noFilter($visibility);
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}
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// If we only have public visibility, we can't look for hidden tags
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if ($visibility === self::$PUBLIC) {
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$inputTags = array_values(array_filter($inputTags, function ($tag) {
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return ! startsWith($tag, '.');
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}));
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if (empty($inputTags)) {
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return [];
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}
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}
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// build regex from all tags
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$re = '/^' . implode(array_map([$this, 'tag2regex'], $inputTags)) . '.*$/';
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if (!$casesensitive) {
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// make regex case insensitive
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$re .= 'i';
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}
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// create resulting array
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$filtered = [];
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// iterate over each link
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foreach ($this->bookmarks as $key => $link) {
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// check level of visibility
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// ignore non private bookmarks when 'privateonly' is on.
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if ($visibility !== 'all') {
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if (!$link->isPrivate() && $visibility === 'private') {
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continue;
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} elseif ($link->isPrivate() && $visibility === 'public') {
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continue;
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}
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}
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// build search string, start with tags of current link
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$search = $link->getTagsString($tagsSeparator);
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if (strlen(trim($link->getDescription())) && strpos($link->getDescription(), '#') !== false) {
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// description given and at least one possible tag found
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$descTags = array();
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// find all tags in the form of #tag in the description
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preg_match_all(
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'/(?<![' . self::$HASHTAG_CHARS . '])#([' . self::$HASHTAG_CHARS . ']+?)\b/sm',
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$link->getDescription(),
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$descTags
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);
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if (count($descTags[1])) {
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// there were some tags in the description, add them to the search string
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$search .= $tagsSeparator . tags_array2str($descTags[1], $tagsSeparator);
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}
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}
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// match regular expression with search string
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if (!preg_match($re, $search)) {
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// this entry does _not_ match our regex
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continue;
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}
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$filtered[$key] = $link;
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}
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return $filtered;
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}
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/**
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* Return only bookmarks without any tag.
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*
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* @param string $visibility return only all/private/public bookmarks.
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*
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* @return Bookmark[] filtered bookmarks.
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*/
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public function filterUntagged(string $visibility)
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{
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$filtered = [];
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foreach ($this->bookmarks as $key => $link) {
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if ($visibility !== 'all') {
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if (!$link->isPrivate() && $visibility === 'private') {
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continue;
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} elseif ($link->isPrivate() && $visibility === 'public') {
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continue;
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}
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}
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if (empty($link->getTags())) {
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$filtered[$key] = $link;
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}
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}
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return $filtered;
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}
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/**
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* Returns the list of articles for a given day, chronologically sorted
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*
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* Day must be in the form 'YYYYMMDD' (e.g. '20120125'), e.g.
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* print_r($mydb->filterDay('20120125'));
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*
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* @param string $day day to filter.
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* @param string $visibility return only all/private/public bookmarks.
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* @return Bookmark[] all link matching given day.
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*
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* @throws Exception if date format is invalid.
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*/
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public function filterDay(string $day, string $visibility)
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{
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if (!checkDateFormat('Ymd', $day)) {
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throw new Exception('Invalid date format');
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}
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$filtered = [];
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foreach ($this->bookmarks as $key => $bookmark) {
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if ($visibility === static::$PUBLIC && $bookmark->isPrivate()) {
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continue;
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}
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if ($bookmark->getCreated()->format('Ymd') == $day) {
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$filtered[$key] = $bookmark;
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}
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}
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// sort by date ASC
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return array_reverse($filtered, true);
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}
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/**
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* Convert a list of tags (str) to an array. Also
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* - handle case sensitivity.
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* - accepts spaces commas as separator.
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*
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* @param string $tags string containing a list of tags.
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* @param bool $casesensitive will convert everything to lowercase if false.
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*
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* @return string[] filtered tags string.
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*/
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public static function tagsStrToArray(string $tags, bool $casesensitive): array
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{
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// We use UTF-8 conversion to handle various graphemes (i.e. cyrillic, or greek)
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$tagsOut = $casesensitive ? $tags : mb_convert_case($tags, MB_CASE_LOWER, 'UTF-8');
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$tagsOut = str_replace(',', ' ', $tagsOut);
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return preg_split('/\s+/', $tagsOut, -1, PREG_SPLIT_NO_EMPTY);
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}
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/**
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* This method finalize the content of the foundPositions array,
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* by associated all search results to their associated bookmark field,
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* making sure that there is no overlapping results, etc.
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*
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* @param array $fieldLengths Start and end positions of every bookmark fields in the aggregated bookmark content.
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* @param array $foundPositions Positions where the search results were found in the aggregated content.
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*
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* @return array Updated $foundPositions, by bookmark field.
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*/
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protected function postProcessFoundPositions(array $fieldLengths, array $foundPositions): array
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{
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// Sort results by starting position ASC.
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usort($foundPositions, function (array $entryA, array $entryB): int {
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return $entryA['start'] > $entryB['start'] ? 1 : -1;
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});
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$out = [];
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$currentMax = -1;
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foreach ($foundPositions as $foundPosition) {
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// we do not allow overlapping highlights
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if ($foundPosition['start'] < $currentMax) {
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continue;
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}
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$currentMax = $foundPosition['end'];
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foreach ($fieldLengths as $part => $length) {
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if ($foundPosition['start'] < $length['start'] || $foundPosition['start'] > $length['end']) {
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continue;
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}
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$out[$part][] = [
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'start' => $foundPosition['start'] - $length['start'],
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'end' => $foundPosition['end'] - $length['start'],
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];
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break;
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}
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}
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return $out;
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}
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/**
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* Concatenate link fields to search across fields. Adds a '\' separator for exact search terms.
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* Also populate $length array with starting and ending positions of every bookmark field
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* inside concatenated content.
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*
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* @param Bookmark $link
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* @param array $lengths (by reference)
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*
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* @return string Lowercase concatenated fields content.
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*/
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protected function buildFullTextSearchableLink(Bookmark $link, array &$lengths): string
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{
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$tagString = $link->getTagsString($this->conf->get('general.tags_separator', ' '));
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$content = mb_convert_case($link->getTitle(), MB_CASE_LOWER, 'UTF-8') .'\\';
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$content .= mb_convert_case($link->getDescription(), MB_CASE_LOWER, 'UTF-8') .'\\';
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$content .= mb_convert_case($link->getUrl(), MB_CASE_LOWER, 'UTF-8') .'\\';
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$content .= mb_convert_case($tagString, MB_CASE_LOWER, 'UTF-8') .'\\';
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$lengths['title'] = ['start' => 0, 'end' => mb_strlen($link->getTitle())];
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$nextField = $lengths['title']['end'] + 1;
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$lengths['description'] = ['start' => $nextField, 'end' => $nextField + mb_strlen($link->getDescription())];
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$nextField = $lengths['description']['end'] + 1;
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$lengths['url'] = ['start' => $nextField, 'end' => $nextField + mb_strlen($link->getUrl())];
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$nextField = $lengths['url']['end'] + 1;
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$lengths['tags'] = ['start' => $nextField, 'end' => $nextField + mb_strlen($tagString)];
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return $content;
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}
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}
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