mirror of
https://github.com/sbrl/Pepperminty-Wiki.git
synced 2024-11-22 04:23:01 +00:00
1448 lines
56 KiB
PHP
1448 lines
56 KiB
PHP
<?php
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register_module([
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"name" => "Search",
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"version" => "0.10",
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"author" => "Starbeamrainbowlabs",
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"description" => "Adds proper search functionality to Pepperminty Wiki using an inverted index to provide a full text search engine. If pages don't show up, then you might have hit a stop word. If not, try requesting the `invindex-rebuild` action to rebuild the inverted index from scratch.",
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"id" => "feature-search",
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"code" => function() {
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global $settings, $paths;
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/**
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* @api {get} ?action=index&page={pageName} Get an index of words for a given page
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* @apiName SearchIndex
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* @apiGroup Search
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* @apiPermission Anonymous
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* @apiDescription For debugging purposes. Be warned - the format could change at any time!
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*
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* @apiParam {string} page The page to generate a word index page.
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*/
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/*
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* ██ ███ ██ ██████ ███████ ██ ██
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* ██ ████ ██ ██ ██ ██ ██ ██
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* ██ ██ ██ ██ ██ ██ █████ ███
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* ██ ██ ██ ██ ██ ██ ██ ██ ██
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* ██ ██ ████ ██████ ███████ ██ ██
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*/
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add_action("index", function() {
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global $settings, $env;
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$breakable_chars = "\r\n\t .,\\/!\"£$%^&*[]()+`_~#";
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header("content-type: text/plain");
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$source = file_get_contents("$env->storage_prefix$env->page.md");
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$index = search::index_generate($source);
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echo("Page name: $env->page\n");
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echo("--------------- Source ---------------\n");
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echo($source); echo("\n");
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echo("--------------------------------------\n\n");
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echo("---------------- Index ---------------\n");
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foreach($index as $term => $entry) {
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echo("$term: {$entry["freq"]} matches | " . implode(", ", $entry["offsets"]) . "\n");
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}
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echo("--------------------------------------\n");
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});
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/**
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* @api {get} ?action=invindex-rebuild Rebuild the inverted search index from scratch
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* @apiDescription Causes the inverted search index to be completely rebuilt from scratch. Can take a while for large wikis!
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* @apiName SearchInvindexRebuild
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* @apiGroup Search
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* @apiPermission Admin
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*
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* @apiParam {string} secret Optional. Specify the secret from peppermint.json here in order to rebuild the search index without logging in.
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*/
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/*
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* ██ ███ ██ ██ ██ ██ ███ ██ ██████ ███████ ██ ██
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* ██ ████ ██ ██ ██ ██ ████ ██ ██ ██ ██ ██ ██
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* ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ █████ ███ █████
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* ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██
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* ██ ██ ████ ████ ██ ██ ████ ██████ ███████ ██ ██
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*
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* ██████ ███████ ██████ ██ ██ ██ ██ ██████
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* ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██
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* ██████ █████ ██████ ██ ██ ██ ██ ██ ██
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* ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██
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* ██ ██ ███████ ██████ ██████ ██ ███████ ██████
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*/
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add_action("invindex-rebuild", function() {
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global $env, $settings;
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if($env->is_admin ||
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(
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!empty($_POST["secret"]) &&
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$_POST["secret"] === $settings->secret
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)
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)
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search::invindex_rebuild();
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else
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{
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http_response_code(401);
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exit(page_renderer::render_main("Error - Search index regenerator - $settings->sitename", "<p>Error: You aren't allowed to regenerate the search index. Try logging in as an admin, or setting the <code>secret</code> POST parameter to $settings->sitename's secret - which can be found in $settings->sitename's <code>peppermint.json</code> file.</p>"));
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}
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});
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/**
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* @api {get} ?action=idindex-show Show the id index
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* @apiDescription Outputs the id index. Useful if you need to verify that it's working as expected. Output is a json object.
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* @apiName SearchShowIdIndex
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* @apiGroup Search
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* @apiPermission Anonymous
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*/
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add_action("idindex-show", function() {
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global $idindex;
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header("content-type: application/json; charset=UTF-8");
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exit(json_encode($idindex, JSON_PRETTY_PRINT));
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});
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/**
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* @api {get} ?action=search&query={text}[&format={format}] Search the wiki for a given query string
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* @apiName Search
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* @apiGroup Search
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* @apiPermission Anonymous
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*
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* @apiParam {string} query The query string to search for.
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* @apiParam {string} format Optional. Valid values: html, json. In json mode an object is returned with page names as keys, values as search result information - sorted in ranking order.
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*/
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/*
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* ███████ ███████ █████ ██████ ██████ ██ ██
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* ██ ██ ██ ██ ██ ██ ██ ██ ██
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* ███████ █████ ███████ ██████ ██ ███████
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* ██ ██ ██ ██ ██ ██ ██ ██ ██
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* ███████ ███████ ██ ██ ██ ██ ██████ ██ ██
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*/
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add_action("search", function() {
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global $settings, $env, $pageindex, $paths;
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// Create the inverted index if it doesn't exist.
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// todo In the future perhaps a CLI for this would be good?
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if(!file_exists($paths->searchindex))
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search::invindex_rebuild(false);
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if(!isset($_GET["query"]))
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exit(page_renderer::render("No Search Terms - Error - $settings->sitename", "<p>You didn't specify any search terms. Try typing some into the box above.</p>"));
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$search_start = microtime(true);
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$time_start = microtime(true);
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search::invindex_load($paths->searchindex);
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$env->perfdata->invindex_decode_time = round((microtime(true) - $time_start)*1000, 3);
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$time_start = microtime(true);
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$results = search::invindex_query($_GET["query"]);
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$resultCount = count($results);
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$env->perfdata->invindex_query_time = round((microtime(true) - $time_start)*1000, 3);
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header("x-invindex-load-time: {$env->perfdata->invindex_decode_time}ms");
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header("x-invindex-query-time: {$env->perfdata->invindex_query_time}ms");
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$start = microtime(true);
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foreach($results as &$result) {
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$result["context"] = search::extract_context(
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$result["pagename"],
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$_GET["query"],
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file_get_contents($env->storage_prefix . $result["pagename"] . ".md")
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);
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}
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$env->perfdata->context_generation_time = round((microtime(true) - $start)*1000, 3);
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header("x-context-generation-time: {$env->perfdata->context_generation_time}ms");
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$env->perfdata->search_time = round((microtime(true) - $search_start)*1000, 3);
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header("x-search-time: {$env->perfdata->search_time}ms");
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if(!empty($_GET["format"]) && $_GET["format"] == "json") {
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header("content-type: application/json");
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$json_results = new stdClass();
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foreach($results as $result) $json_results->{$result["pagename"]} = $result;
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exit(json_encode($json_results));
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}
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$title = $_GET["query"] . " - Search results - $settings->sitename";
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$content = "<section>\n";
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$content .= "<h1>Search Results</h1>";
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/// Search Box ///
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$content .= "<form method='get' action=''>\n";
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$content .= " <input type='search' id='search-box' name='query' placeholder='Type your query here and then press enter.' value='" . htmlentities($_GET["query"], ENT_HTML5 | ENT_QUOTES) . "' />\n";
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$content .= " <input type='hidden' name='action' value='search' />\n";
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$content .= "</form>";
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$content .= "<p>Found $resultCount " . ($resultCount === 1 ? "result" : "results") . " in " . $env->perfdata->search_time . "ms. ";
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$query = $_GET["query"];
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if(isset($pageindex->$query)) {
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$content .= "There's a page on $settings->sitename called <a href='?page=" . rawurlencode($query) . "'>$query</a>.";
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}
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else
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{
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$content .= "There isn't a page called $query on $settings->sitename, but you ";
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if((!$settings->anonedits && !$env->is_logged_in) || !$settings->editing) {
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$content .= "do not have permission to create it.";
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if(!$env->is_logged_in) {
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$content .= " You could try <a href='?action=login&returnto=" . rawurlencode($_SERVER["REQUEST_URI"]) . "'>logging in</a>.";
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}
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}
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else {
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$content .= "can <a href='?action=edit&page=" . rawurlencode($query) . "'>create it</a>.";
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}
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}
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$content .= "</p>";
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if(module_exists("page-list")) {
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// TODO: Refactor ths to use STAS
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$nterms = search::tokenize($query);
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$nterms_regex = implode("|", array_map(function($nterm) {
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return preg_quote(strtolower(trim($nterm)));
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}, $nterms));
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$all_tags = get_all_tags();
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$matching_tags = [];
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foreach($all_tags as $tag) {
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if(preg_match("/$nterms_regex/i", trim($tag)) > 0)
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$matching_tags[] = $tag;
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}
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if(count($matching_tags) > 0) {
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$content .= "<p class='matching-tags-display'><label>Matching tags</label><span class='tags'>";
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foreach($matching_tags as $tag) {
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$content .= "\t<a href='?action=list-tags&tag=" . rawurlencode($tag) ."' class='mini-tag'>" . htmlentities($tag) . "</a> \n";
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}
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$content .= "</span></p>";
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}
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}
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$i = 0; // todo use $_GET["offset"] and $_GET["result-count"] or something
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foreach($results as $result)
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{
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$link = "?page=" . rawurlencode($result["pagename"]);
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$pagesource = file_get_contents($env->storage_prefix . $result["pagename"] . ".md");
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//echo("Extracting context for result " . $result["pagename"] . ".\n");
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$context = $result["context"];
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if(mb_strlen($context) === 0)
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$context = mb_substr($pagesource, 0, $settings->search_characters_context * 2);
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//echo("'Generated search context for " . $result["pagename"] . ": $context'\n");
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$context = search::highlight_context(
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$_GET["query"],
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preg_replace('/</u', '<', $context)
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);
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/*if(strlen($context) == 0)
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{
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$context = search::strip_markup(file_get_contents("$env->page.md", null, null, null, $settings->search_characters_context * 2));
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if($pageindex->{$env->page}->size > $settings->search_characters_context * 2)
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$context .= "...";
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}*/
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$tag_list = "<span class='tags'>";
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foreach($pageindex->{$result["pagename"]}->tags ?? [] as $tag) $tag_list .= "<a href='?action=list-tags&tag=" . rawurlencode($tag) . "' class='mini-tag'>$tag</a>";
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$tag_list .= "</span>\n";
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// Make redirect pages italics
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if(!empty($pageindex->{$result["pagename"]}->redirect))
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$result["pagename"] = "<em>{$result["pagename"]}</em>";
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// We add 1 to $i here to convert it from an index to a result
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// number as people expect it to start from 1
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$content .= "<div class='search-result' data-result-number='" . ($i + 1) . "' data-rank='" . $result["rank"] . "'>\n";
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$content .= " <h2><a href='$link'>" . $result["pagename"] . "</a> <span class='search-result-badges'>$tag_list</span></h2>\n";
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$content .= " <p class='search-context'>$context</p>\n";
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$content .= "</div>\n";
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$i++;
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}
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$content .= "</section>\n";
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header("content-type: text/html; charset=UTF-8");
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exit(page_renderer::render($title, $content));
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//header("content-type: text/plain");
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//var_dump($results);
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});
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/*
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* ██████ ██ ██ ███████ ██████ ██ ██
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* ██ ██ ██ ██ ██ ██ ██ ██ ██
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* ██ ██ ██ ██ █████ ██████ ████ █████
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* ██ ▄▄ ██ ██ ██ ██ ██ ██ ██
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* ██████ ██████ ███████ ██ ██ ██
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* ▀▀
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* ███████ ███████ █████ ██████ ██████ ██ ██ ██ ███ ██ ██████ ███████ ██ ██
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* ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ████ ██ ██ ██ ██ ██ ██
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* ███████ █████ ███████ ██████ ██ ███████ ██ ██ ██ ██ ██ ██ █████ ███
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* ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██
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* ███████ ███████ ██ ██ ██ ██ ██████ ██ ██ ██ ██ ████ ██████ ███████ ██ ██
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*/
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/**
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* @api {get} ?action=query-searchindex&query={text} Inspect the internals of the search results for a query
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* @apiName Search
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* @apiGroup Search
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* @apiPermission Anonymous
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*
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* @apiParam {string} query The query string to search for.
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*/
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add_action("query-searchindex", function() {
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global $env, $paths;
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if(empty($_GET["query"])) {
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http_response_code(400);
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header("content-type: text/plain");
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exit("Error: No query specified. Specify it with the 'query' GET parameter.");
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}
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$env->perfdata->searchindex_decode_start = microtime(true);
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search::invindex_load($paths->searchindex);
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$env->perfdata->searchindex_decode_time = (microtime(true) - $env->perfdata->searchindex_decode_start) * 1000;
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$env->perfdata->searchindex_query_start = microtime(true);
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$searchResults = search::invindex_query($_GET["query"]);
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$env->perfdata->searchindex_query_time = (microtime(true) - $env->perfdata->searchindex_query_start) * 1000;
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header("content-type: application/json");
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$result = new stdClass();
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$result->time_format = "ms";
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$result->decode_time = $env->perfdata->searchindex_decode_time;
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$result->query_time = $env->perfdata->searchindex_query_time;
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$result->total_time = $result->decode_time + $result->query_time;
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$result->stas = search::stas_parse(search::stas_split($_GET["query"]));
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$result->search_results = $searchResults;
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exit(json_encode($result, JSON_PRETTY_PRINT));
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});
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/**
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* @api {get} ?action=stas-parse&query={text} Debug search queries
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* @apiDescription Debug Pepperminty Wiki's understanding of search queries.
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* If you want something machine-readable, check out the new stas property on the object returned by query-searchindex.
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* @apiName SearchSTASParse
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* @apiGroup Search
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* @apiPermission Anonymous
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*
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* @apiParam {string} query The query string to parse.
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*/
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add_action("stas-parse", function() {
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global $settings;
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$tokens = search::stas_split($_GET["query"]);
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$stas_query = search::stas_parse($tokens);
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$result = "";
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foreach($tokens as $token) {
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if(in_array(substr($token, 1), $stas_query["exclude"])) {
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$result .= "<span title='explicit exclude' style='color: red; text-decoration: dotted line-through;'>$token</span> ";
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continue;
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}
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$term = null;
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$token_part = $token;
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if(strpos($token_part, ":") !== false) $token_part = explode(":", $token_part, 2)[1];
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foreach($stas_query["terms"] as $c_term) {
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if($c_term["term"] == $token_part) {
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$term = $c_term;
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break;
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}
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}
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if($term == null) {
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$result .= "<span title='unknown' style='color: black; text-decoration: wavy underline;'>$token</span> ";
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continue;
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}
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$title = "?";
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$style = "";
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switch($term["weight"]) {
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case -1: $style .= "color: grey; text-decoration: wavy line-through;"; $title = "stop word"; break;
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case 1: $style .= "color: blue;"; $title = "normal word"; break;
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}
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switch($term["location"]) {
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case "body": $style = "color: cyan"; $title = "body only"; break;
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case "title": $style .= "font-weight: bolder; font-size: 1.2em; color: orange;"; $title = "searching title only"; break;
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case "tags": $style .= "font-weight: bolder; color: purple;"; $title = "searching tags only"; break;
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case "all": $title .= ", searching everywhere";
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}
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$result .= "<span title='$title' style='$style'>$token</span> ";
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}
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exit(page_renderer::render_main("STAS Query Analysis - $settings->sitename", "<p>$settings->sitename understood your query to mean the following:</p>
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<blockquote>$result</blockquote>"));
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});
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/*
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* ██████ ██████ ███████ ███ ██ ███████ ███████ █████ ██████ ██████ ██ ██
|
|
* ██ ██ ██ ██ ██ ████ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██
|
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* ██ ██ ██████ █████ ██ ██ ██ ███████ █████ ███████ ██████ ██ ███████
|
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* ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██
|
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* ██████ ██ ███████ ██ ████ ███████ ███████ ██ ██ ██ ██ ██████ ██ ██
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*/
|
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/**
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* @api {get} ?action=opensearch-description Get the opensearch description file
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* @apiName OpenSearchDescription
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* @apiGroup Search
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* @apiPermission Anonymous
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*/
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add_action("opensearch-description", function () {
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global $settings;
|
|
$siteRoot = full_url() . "/index.php";
|
|
if(!isset($_GET["debug"]))
|
|
header("content-type: application/opensearchdescription+xml");
|
|
else
|
|
header("content-type: text/plain");
|
|
|
|
exit('<?xml version="1.0" encoding="UTF-8"?' . '>' . // hack The build system strips it otherwise O.o I should really fix that.
|
|
"\n<OpenSearchDescription xmlns=\"http://a9.com/-/spec/opensearch/1.1/\">
|
|
<ShortName>Search $settings->sitename</ShortName>
|
|
<Description>Search $settings->sitename, which is powered by Pepperminty Wiki.</Description>
|
|
<Tags>$settings->sitename Wiki</Tags>
|
|
<Image type=\"image/png\">$settings->favicon</Image>
|
|
<Attribution>Search content available under the license linked to at the bottom of the search results page.</Attribution>
|
|
<Developer>Starbeamrainbowlabs (https://github.com/sbrl/Pepperminty-Wiki/graphs/contributors)</Developer>
|
|
<InputEncoding>UTF-8</InputEncoding>
|
|
<OutputEncoding>UTF-8</OutputEncoding>
|
|
|
|
<Url type=\"text/html\" method=\"get\" template=\"$siteRoot?action=view&search-redirect=yes&page={searchTerms}&offset={startIndex?}&count={count}\" />
|
|
<Url type=\"application/x-suggestions+json\" template=\"$siteRoot?action=suggest-pages&query={searchTerms}&type=opensearch\" />
|
|
</OpenSearchDescription>");
|
|
});
|
|
|
|
|
|
/**
|
|
* @api {get} ?action=suggest-pages[&type={type}] Get page name suggestions for a query
|
|
* @apiName OpenSearchDescription
|
|
* @apiGroup Search
|
|
* @apiPermission Anonymous
|
|
*
|
|
* @apiParam {string} text The search query string to get search suggestions for.
|
|
* @apiParam {string} type The type of result to return. Default value: json. Available values: json, opensearch
|
|
*/
|
|
add_action("suggest-pages", function() {
|
|
global $settings, $pageindex;
|
|
|
|
if($settings->dynamic_page_suggestion_count === 0) {
|
|
header("content-type: application/json");
|
|
header("content-length: 3");
|
|
exit("[]\n");
|
|
}
|
|
|
|
if(empty($_GET["query"])) {
|
|
http_response_code(400);
|
|
header("content-type: text/plain");
|
|
exit("Error: You didn't specify the 'query' GET parameter.");
|
|
}
|
|
|
|
$type = $_GET["type"] ?? "json";
|
|
|
|
if(!in_array($type, ["json", "opensearch"])) {
|
|
http_response_code(406);
|
|
exit("Error: The type '$type' is not one of the supported output types. Available values: json, opensearch. Default: json");
|
|
}
|
|
|
|
$query = search::transliterate($_GET["query"]);
|
|
|
|
// Rank each page name
|
|
$results = [];
|
|
foreach($pageindex as $pageName => $entry) {
|
|
$results[] = [
|
|
"pagename" => $pageName,
|
|
// Costs: Insert: 1, Replace: 8, Delete: 6
|
|
"distance" => levenshtein($query, search::transliterate($pageName), 1, 8, 6)
|
|
];
|
|
}
|
|
|
|
// Sort the page names by distance from the original query
|
|
usort($results, function($a, $b) {
|
|
if($a["distance"] == $b["distance"])
|
|
return strcmp($a["pagename"], $b["pagename"]);
|
|
return $a["distance"] < $b["distance"] ? -1 : 1;
|
|
});
|
|
|
|
// Send the results to the user
|
|
$suggestions = array_slice($results, 0, $settings->dynamic_page_suggestion_count);
|
|
switch($type)
|
|
{
|
|
case "json":
|
|
header("content-type: application/json");
|
|
exit(json_encode($suggestions));
|
|
case "opensearch":
|
|
$opensearch_output = [
|
|
$_GET["query"],
|
|
array_map(function($suggestion) { return $suggestion["pagename"]; }, $suggestions)
|
|
];
|
|
header("content-type: application/x-suggestions+json");
|
|
exit(json_encode($opensearch_output));
|
|
}
|
|
});
|
|
|
|
if($settings->dynamic_page_suggestion_count > 0)
|
|
{
|
|
page_renderer::add_js_snippet('/// Dynamic page suggestion system
|
|
// Micro snippet 8 - Promisified GET (fetched 20th Nov 2016)
|
|
function get(u){return new Promise(function(r,t,a){a=new XMLHttpRequest();a.onload=function(b,c){b=a.status;c=a.response;if(b>199&&b<300){r(c)}else{t(c)}};a.open("GET",u,true);a.send(null)})}
|
|
|
|
window.addEventListener("load", function(event) {
|
|
var searchBox = document.querySelector("input[type=search]");
|
|
searchBox.dataset.lastValue = "";
|
|
searchBox.addEventListener("keyup", function(event) {
|
|
// Make sure that we don\'t keep sending requests to the server if nothing has changed
|
|
if(searchBox.dataset.lastValue == event.target.value)
|
|
return;
|
|
searchBox.dataset.lastValue = event.target.value;
|
|
// Fetch the suggestions from the server
|
|
get("?action=suggest-pages&query=" + encodeURIComponent(event.target.value)).then(function(response) {
|
|
var suggestions = JSON.parse(response),
|
|
dataList = document.getElementById("allpages");
|
|
|
|
// If the server sent no suggestions, then we shouldn\'t replace the contents of the datalist
|
|
if(suggestions.length == 0)
|
|
return;
|
|
|
|
console.info(`Fetched suggestions for ${event.target.value}:`, suggestions.map(s => s.pagename));
|
|
|
|
// Remove all the existing suggestions
|
|
while(dataList.firstChild) {
|
|
dataList.removeChild(dataList.firstChild);
|
|
}
|
|
|
|
// Add the new suggestions to the datalist
|
|
var optionsFrag = document.createDocumentFragment();
|
|
suggestions.forEach(function(suggestion) {
|
|
var suggestionElement = document.createElement("option");
|
|
suggestionElement.value = suggestion.pagename;
|
|
suggestionElement.dataset.distance = suggestion.distance;
|
|
optionsFrag.appendChild(suggestionElement);
|
|
});
|
|
dataList.appendChild(optionsFrag);
|
|
});
|
|
});
|
|
});
|
|
');
|
|
}
|
|
}
|
|
]);
|
|
|
|
/*
|
|
███████ ████████ ██████ ██████ █████ ██████ ███████ ██████ ██████ ██ ██
|
|
██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██
|
|
███████ ██ ██ ██ ██████ ███████ ██ ███ █████ ██████ ██ ██ ███
|
|
██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██ ██
|
|
███████ ██ ██████ ██ ██ ██ ██ ██████ ███████ ██████ ██████ ██ ██
|
|
*/
|
|
|
|
/**
|
|
* Represents a key-value data store.
|
|
*/
|
|
class StorageBox {
|
|
/**
|
|
* The SQLite database connection.
|
|
* @var \PDO
|
|
*/
|
|
private $db;
|
|
|
|
/**
|
|
* A cache of values.
|
|
* @var object[]
|
|
*/
|
|
private $cache = [];
|
|
|
|
/**
|
|
* A cache of prepared SQL statements.
|
|
* @var \PDOStatement[]
|
|
*/
|
|
private $query_cache = [];
|
|
|
|
/**
|
|
* Initialises a new store connection.
|
|
* @param string $filename The filename that the store is located in.
|
|
*/
|
|
function __construct(string $filename) {
|
|
$firstrun = !file_exists($filename);
|
|
$this->db = new \PDO("sqlite:" . path_resolve($filename, __DIR__)); // HACK: This might not work on some systems, because it depends on the current working directory
|
|
$this->db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
|
|
if($firstrun) {
|
|
$this->query("CREATE TABLE store (key TEXT UNIQUE NOT NULL, value TEXT)");
|
|
}
|
|
}
|
|
/**
|
|
* Makes a query against the database.
|
|
* @param string $sql The (potentially parametised) query to make.
|
|
* @param array $variables Optional. The variables to substitute into the SQL query.
|
|
* @return \PDOStatement The result of the query, as a PDOStatement.
|
|
*/
|
|
private function query(string $sql, array $variables = []) {
|
|
// Add to the query cache if it doesn't exist
|
|
if(!isset($this->query_cache[$sql]))
|
|
$this->query_cache[$sql] = $this->db->prepare($sql);
|
|
$this->query_cache[$sql]->execute($variables);
|
|
return $this->query_cache[$sql]; // fetchColumn(), fetchAll(), etc. are defined on the statement, not the return value of execute()
|
|
}
|
|
|
|
/**
|
|
* Determines if the given key exists in the store or not.
|
|
* @param string $key The key to test.
|
|
* @return bool Whether the key exists in the store or not.
|
|
*/
|
|
public function has(string $key) : bool {
|
|
if(isset($this->cache[$key]))
|
|
return true;
|
|
return $this->query(
|
|
"SELECT COUNT(key) FROM store WHERE key = :key;",
|
|
[ "key" => $key ]
|
|
)->fetchColumn() > 0;
|
|
}
|
|
|
|
/**
|
|
* Gets a value from the store.
|
|
* @param string $key The key value is stored under.
|
|
* @return mixed The stored value.
|
|
*/
|
|
public function get(string $key) {
|
|
// If it's not in the cache, insert it
|
|
if(!isset($this->cache[$key])) {
|
|
$this->cache[$key] = [ "modified" => false, "value" => json_decode($this->query(
|
|
"SELECT value FROM store WHERE key = :key;",
|
|
[ "key" => $key ]
|
|
)->fetchColumn()) ];
|
|
}
|
|
return $this->cache[$key]["value"];
|
|
}
|
|
|
|
/**
|
|
* Sets a value in the data store.
|
|
* Note that this does NOT save changes to disk until you close the connection!
|
|
* @param string $key The key to set the value of.
|
|
* @param mixed $value The value to store.
|
|
*/
|
|
public function set(string $key, $value) : void {
|
|
if(!isset($this->cache[$key])) $this->cache[$key] = [];
|
|
$this->cache[$key]["value"] = $value;
|
|
$this->cache[$key]["modified"] = true;
|
|
}
|
|
|
|
/**
|
|
* Deletes an item from the data store.
|
|
* @param string $key The key of the item to delete.
|
|
* @return bool Whether it was really deleted or not. Note that if it doesn't exist, then it can't be deleted.
|
|
*/
|
|
public function delete(string $key) : bool {
|
|
// Remove it from the cache
|
|
if(isset($this->cache[$key]))
|
|
unset($this->cache[$key]);
|
|
// Remove it from disk
|
|
$this->query(
|
|
"DELETE FROM store WHERE key = :key;",
|
|
[ "key" => $key ]
|
|
)->rowCount() > 0;
|
|
}
|
|
|
|
/**
|
|
* Empties the store.
|
|
*/
|
|
public function clear() : void {
|
|
// Empty the cache;
|
|
$this->cache = [];
|
|
// Empty the disk
|
|
$this->query("DELETE FROM store;");
|
|
}
|
|
|
|
/**
|
|
* Syncs changes to disk and closes the PDO connection.
|
|
*/
|
|
public function close() : void {
|
|
$this->db->beginTransaction();
|
|
foreach($this->cache as $key => $value_data) {
|
|
// If it wasn't modified, there's no point in saving it, is there?
|
|
if(!$value_data["modified"])
|
|
continue;
|
|
|
|
$this->query(
|
|
"INSERT OR REPLACE INTO store(key, value) VALUES(:key, :value)",
|
|
[
|
|
"key" => $key,
|
|
"value" => json_encode($value_data["value"])
|
|
]
|
|
);
|
|
}
|
|
$this->db->commit();
|
|
$this->db = null;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
███████ ███████ █████ ██████ ██████ ██ ██
|
|
██ ██ ██ ██ ██ ██ ██ ██ ██
|
|
███████ █████ ███████ ██████ ██ ███████
|
|
██ ██ ██ ██ ██ ██ ██ ██ ██
|
|
███████ ███████ ██ ██ ██ ██ ██████ ██ ██
|
|
*/
|
|
|
|
/**
|
|
* Holds a collection to methods to manipulate various types of search index.
|
|
* @package search
|
|
*/
|
|
class search
|
|
{
|
|
/**
|
|
* Words that we should exclude from the inverted index
|
|
* @var string[]
|
|
*/
|
|
public static $stop_words = [
|
|
"a", "about", "above", "above", "across", "after", "afterwards", "again",
|
|
"against", "all", "almost", "alone", "along", "already", "also",
|
|
"although", "always", "am", "among", "amongst", "amoungst", "amount",
|
|
"an", "and", "another", "any", "anyhow", "anyone", "anything", "anyway",
|
|
"anywhere", "are", "around", "as", "at", "back", "be", "became",
|
|
"because", "become", "becomes", "becoming", "been", "before",
|
|
"beforehand", "behind", "being", "below", "beside", "besides",
|
|
"between", "beyond", "bill", "both", "bottom", "but", "by", "call",
|
|
"can", "cannot", "cant", "co", "con", "could", "couldnt", "cry", "de",
|
|
"describe", "detail", "do", "done", "down", "due", "during", "each",
|
|
"eg", "eight", "either", "eleven", "else", "elsewhere", "empty",
|
|
"enough", "etc", "even", "ever", "every", "everyone", "everything",
|
|
"everywhere", "except", "few", "fill", "find",
|
|
"fire", "first", "five", "for", "former", "formerly", "found",
|
|
"four", "from", "front", "full", "further", "get", "give", "go", "had",
|
|
"has", "hasnt", "have", "he", "hence", "her", "here", "hereafter",
|
|
"hereby", "herein", "hereupon", "hers", "herself", "him", "himself",
|
|
"his", "how", "however", "ie", "if", "in", "inc", "indeed",
|
|
"interest", "into", "is", "it", "its", "itself", "keep", "last",
|
|
"latter", "latterly", "least", "less", "ltd", "made", "many", "may",
|
|
"me", "meanwhile", "might", "mine", "more", "moreover", "most",
|
|
"mostly", "move", "much", "must", "my", "myself", "name", "namely",
|
|
"neither", "never", "nevertheless", "next", "nine", "no", "none",
|
|
"nor", "not", "nothing", "now", "nowhere", "of", "off", "often", "on",
|
|
"once", "one", "only", "onto", "or", "other", "others", "otherwise",
|
|
"our", "ours", "ourselves", "out", "over", "own", "part", "per",
|
|
"perhaps", "please", "put", "rather", "re", "same", "see", "seem",
|
|
"seemed", "seeming", "seems", "serious", "several", "she", "should",
|
|
"show", "side", "since", "sincere", "six", "sixty", "so", "some",
|
|
"somehow", "someone", "something", "sometime", "sometimes",
|
|
"somewhere", "still", "such", "system", "take", "ten", "than", "that",
|
|
"the", "their", "them", "themselves", "then", "thence", "there",
|
|
"thereafter", "thereby", "therefore", "therein", "thereupon", "these",
|
|
"they", "thickv", "thin", "third", "this", "those", "though", "three",
|
|
"through", "throughout", "thru", "thus", "to", "together", "too", "top",
|
|
"toward", "towards", "twelve", "twenty", "two", "un", "under", "until",
|
|
"up", "upon", "us", "very", "via", "was", "we", "well", "were", "what",
|
|
"whatever", "when", "whence", "whenever", "where", "whereafter",
|
|
"whereas", "whereby", "wherein", "whereupon", "wherever", "whether",
|
|
"which", "while", "whither", "who", "whoever", "whole", "whom", "whose",
|
|
"why", "will", "with", "within", "without", "would", "yet", "you",
|
|
"your", "yours", "yourself", "yourselves"
|
|
];
|
|
|
|
/**
|
|
* The StorageBox that contains the inverted index.
|
|
* @var StorageBox
|
|
*/
|
|
private static $invindex = null;
|
|
/**
|
|
* Cache variable for the transliterator instance used by search::transliterate.
|
|
* @var Transliterator
|
|
*/
|
|
private static $literator = null;
|
|
|
|
/**
|
|
* Transliterates a string to make it more suitable for entry into the search index.
|
|
* @param string $str The string to transliterate.
|
|
* @return string The transliterated string.
|
|
*/
|
|
public static function transliterate(string $str) : string {
|
|
if(self::$literator == null)
|
|
self::$literator = Transliterator::createFromRules(':: Any-Latin; :: Latin-ASCII; :: NFD; :: [:Nonspacing Mark:] Remove; :: Lower(); :: NFC;', Transliterator::FORWARD);
|
|
|
|
return self::$literator->transliterate($str);
|
|
}
|
|
|
|
/**
|
|
* Converts a source string into an index of search terms that can be
|
|
* merged into an inverted index.
|
|
* Automatically transliterates the source string.
|
|
* @param string $source The source string to index.
|
|
* @return array An index represents the specified string.
|
|
*/
|
|
public static function index_generate(string $source) : array {
|
|
// We don't need to normalise or transliterate here because self::tokenize() does this for us
|
|
$source = html_entity_decode($source, ENT_QUOTES);
|
|
$source_length = mb_strlen($source);
|
|
|
|
$index = [];
|
|
|
|
$terms = self::tokenize($source, true);
|
|
foreach($terms as $term) {
|
|
// Skip over stop words (see https://en.wikipedia.org/wiki/Stop_words)
|
|
if(in_array($term[0], self::$stop_words)) continue;
|
|
|
|
if(!isset($index[$term[0]]))
|
|
$index[$term[0]] = [ "freq" => 0, "offsets" => [] ];
|
|
|
|
$index[$term[0]]["freq"]++;
|
|
$index[$term[0]]["offsets"][] = $term[1];
|
|
}
|
|
|
|
return $index;
|
|
}
|
|
|
|
/**
|
|
* Converts a source string into a series of raw tokens.
|
|
* @param string $source The source string to process.
|
|
* @param bool $capture_offsets Whether to capture & return the character offsets of the tokens detected. If true, then each token returned will be an array in the form [ token, char_offset ].
|
|
* @return array An array of raw tokens extracted from the specified source string.
|
|
*/
|
|
public static function tokenize(string $source, bool $capture_offsets = false) : array {
|
|
|
|
$flags = PREG_SPLIT_NO_EMPTY; // Don't return empty items
|
|
if($capture_offsets)
|
|
$flags |= PREG_SPLIT_OFFSET_CAPTURE;
|
|
|
|
// We don't need to normalise here because the transliterator handles
|
|
// this for us. Also, we can't move the literator to a static member
|
|
// variable because PHP doesn't like it very much
|
|
$source = self::transliterate($source);
|
|
$source = preg_replace('/[\[\]\|\{\}\/]/u', " ", $source);
|
|
return preg_split("/((^\p{P}+)|(\p{P}*\s+\p{P}*)|(\p{P}+$))|\|/u", $source, -1, $flags);
|
|
}
|
|
|
|
/**
|
|
* Removes (most) markdown markup from the specified string.
|
|
* Stripped strings are not suitable for indexing!
|
|
* @param string $source The source string to process.
|
|
* @return string The stripped string.
|
|
*/
|
|
public static function strip_markup(string $source) : string {
|
|
return preg_replace('/([\"*_\[\]]| - |`)/u', "", $source);
|
|
}
|
|
|
|
/**
|
|
* Rebuilds the master inverted index and clears the page id index.
|
|
* @param bool $output Whether to send progress information to the user's browser.
|
|
*/
|
|
public static function invindex_rebuild(bool $output = true) : void {
|
|
global $pageindex, $env, $paths, $settings;
|
|
|
|
if($output) {
|
|
header("content-type: text/event-stream");
|
|
ob_end_flush();
|
|
}
|
|
|
|
// Clear the id index out
|
|
ids::clear();
|
|
|
|
// Clear the existing inverted index out
|
|
if(self::$invindex == null)
|
|
self::invindex_load($paths->searchindex);
|
|
self::$invindex->clear();
|
|
self::$invindex->set("|termlist|", []);
|
|
|
|
// Reindex each page in turn
|
|
$i = 0; $max = count(get_object_vars($pageindex));
|
|
$missing_files = 0;
|
|
foreach($pageindex as $pagename => $pagedetails)
|
|
{
|
|
$page_filename = $env->storage_prefix . $pagedetails->filename;
|
|
if(!file_exists($page_filename)) {
|
|
echo("data: [" . ($i + 1) . " / $max] Error: Can't find $page_filename\n");
|
|
flush();
|
|
$i++; $missing_files++;
|
|
continue;
|
|
}
|
|
// We do not transliterate or normalise here because the indexer will take care of this for us
|
|
$index = self::index_generate(file_get_contents($page_filename));
|
|
|
|
$pageid = ids::getid($pagename);
|
|
self::invindex_merge($pageid, $index);
|
|
|
|
if($output) {
|
|
echo("data: [" . ($i + 1) . " / $max] Added $pagename (id #$pageid) to the new search index.\n\n");
|
|
flush();
|
|
}
|
|
|
|
$i++;
|
|
}
|
|
|
|
echo("data: Syncing to disk....\n\n");
|
|
self::invindex_close();
|
|
|
|
if($output) {
|
|
echo("data: Search index rebuilding complete.\n\n");
|
|
echo("data: Couldn't find $missing_files pages on disk. If $settings->sitename couldn't find some pages on disk, then you might need to manually correct $settings->sitename's page index (stored in pageindex.json).\n\n");
|
|
echo("data: Done! Saving new search index to '$paths->searchindex'.\n\n");
|
|
}
|
|
|
|
// No need to save, it's an SQLite DB backend
|
|
}
|
|
|
|
/**
|
|
* Sorts an index alphabetically. Will also sort an inverted index.
|
|
* This allows us to do a binary search instead of a regular
|
|
* sequential search.
|
|
* @param array $index The index to sort.
|
|
*/
|
|
public static function index_sort(&$index) { ksort($index, SORT_NATURAL); }
|
|
|
|
/**
|
|
* Compares two *regular* indexes to find the differences between them.
|
|
* @param array $oldindex The old index.
|
|
* @param array $newindex The new index.
|
|
* @param array $changed An array to be filled with the nterms of all the changed entries.
|
|
* @param array $removed An array to be filled with the nterms of all the removed entries.
|
|
*/
|
|
public static function index_compare($oldindex, $newindex, &$changed, &$removed) {
|
|
foreach($oldindex as $nterm => $entry) {
|
|
if(!isset($newindex[$nterm]))
|
|
$removed[] = $nterm;
|
|
}
|
|
foreach($newindex as $nterm => $entry) {
|
|
if(!isset($oldindex[$nterm]) or // If this word is new
|
|
$newindex[$nterm] !== $oldindex[$nterm]) // If this word has changed
|
|
$changed[$nterm] = $newindex[$nterm];
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Loads a connection to an inverted index.
|
|
* @param string $invindex_filename The path to the inverted index to load.
|
|
* @todo Remove this function and make everything streamable
|
|
*/
|
|
public static function invindex_load(string $invindex_filename) {
|
|
global $env, $paths;
|
|
$start_time = microtime(true);
|
|
self::$invindex = new StorageBox($invindex_filename);
|
|
$env->perfdata->searchindex_load_time = round((microtime(true) - $start_time)*1000, 3);
|
|
}
|
|
|
|
/**
|
|
* Closes the currently open inverted index.
|
|
*/
|
|
public static function invindex_close() {
|
|
global $env;
|
|
|
|
$start_time = microtime(true);
|
|
self::$invindex->close();
|
|
$env->perfdata->searchindex_close_time = round((microtime(true) - $start_time)*1000, 3);
|
|
}
|
|
|
|
/**
|
|
* Merge an index into an inverted index.
|
|
* @param int $pageid The id of the page to assign to the index that's being merged.
|
|
* @param array $index The regular index to merge.
|
|
* @param array $removals An array of index entries to remove from the inverted index. Useful for applying changes to an inverted index instead of deleting and remerging an entire page's index.
|
|
*/
|
|
public static function invindex_merge($pageid, &$index, &$removals = []) : void {
|
|
if(self::$invindex == null)
|
|
throw new Exception("Error: Can't merge into an inverted index that isn't loaded.");
|
|
|
|
if(!self::$invindex->has("|termlist|"))
|
|
self::$invindex->set("|termlist|", []);
|
|
$termlist = self::$invindex->get("|termlist|");
|
|
|
|
// Remove all the subentries that were removed since last time
|
|
foreach($removals as $nterm) {
|
|
// Delete the offsets
|
|
self::$invindex->delete("$nterm|$pageid");
|
|
// Delete the item from the list of pageids containing this term
|
|
$nterm_pageids = self::$invindex->get($nterm);
|
|
array_splice($nterm_pageids, array_search($pageid, $nterm_pageids), 1);
|
|
if(empty($nterm_pageids)) { // No need to keep the pageid list if there's nothing in it
|
|
self::$invindex->delete($nterm);
|
|
// Update the termlist if we're deleting the term completely
|
|
$termlist_loc = array_search($nterm, $termlist);
|
|
if($termlist_loc !== false) array_splice($termlist, $termlist_loc, 1);
|
|
}
|
|
else
|
|
self::$invindex->set($nterm, $nterm_pageids);
|
|
}
|
|
|
|
// Merge all the new / changed index entries into the inverted index
|
|
foreach($index as $nterm => $newentry) {
|
|
if(!self::$invindex->has($nterm)) {
|
|
self::$invindex->set($nterm, []);
|
|
$termlist[] = $nterm;
|
|
}
|
|
|
|
// Update the nterm pageid list
|
|
$nterm_pageids = self::$invindex->get($nterm);
|
|
if(array_search($pageid, $nterm_pageids) === false) {
|
|
$nterm_pageids[] = $pageid;
|
|
self::$invindex->set($nterm, $nterm_pageids);
|
|
}
|
|
|
|
// Store the offset list
|
|
self::$invindex->set("$nterm|$pageid", $newentry);
|
|
}
|
|
|
|
self::$invindex->set("|termlist|", $termlist);
|
|
}
|
|
|
|
/**
|
|
* Deletes the given pageid from the given pageindex.
|
|
* @param int $pageid The pageid to remove.
|
|
*/
|
|
public static function invindex_delete(int $pageid) {
|
|
$termlist = self::$invindex->get("|termlist|");
|
|
foreach($termlist as $nterm) {
|
|
$nterm_pageids = self::$invindex->get("$nterm");
|
|
$nterm_loc = array_search($pageid, $nterm_pageids);
|
|
// If this nterm doesn't appear in the list, we're not interested
|
|
if($nterm_loc === false)
|
|
continue;
|
|
|
|
// Delete it from the ntemr list
|
|
array_splice($nterm_pageids, $nterm_loc, 1);
|
|
|
|
// Delete the offset list
|
|
self::$invindex->delete("$nterm|$pageid");
|
|
|
|
// If this term doesn't appear in any other documents, delete it
|
|
if(count($nterm_pageids) === 0) {
|
|
self::$invindex->delete($nterm);
|
|
array_splice($termlist, array_search($nterm, $termlist), 1);
|
|
}
|
|
else // Save the document id list back, since it still contains other pageids
|
|
self::$invindex->set($nterm, $nterm_pageids);
|
|
}
|
|
// Save the termlist back to the store
|
|
self::$invindex->set("|termlist|", $termlist);
|
|
}
|
|
|
|
|
|
/*
|
|
* ███████ ████████ █████ ███████
|
|
* ██ ██ ██ ██ ██
|
|
* ███████ ██ ███████ ███████
|
|
* ██ ██ ██ ██ ██
|
|
* ███████ ██ ██ ██ ███████
|
|
*/
|
|
|
|
/**
|
|
* Splits a *transliterated* query string into tokens.
|
|
* Actually based on my earlier explode_adv https://starbeamrainbowlabs.com/blog/article.php?article=posts/081-PHP-String-Splitting.html
|
|
* @param string $query The queyr string to split.
|
|
*/
|
|
public function stas_split($query) {
|
|
$chars = str_split(self::transliterate($query));
|
|
$terms = [];
|
|
$next_term = "";
|
|
$toggle_state = false; // true = now inside, false = now outside
|
|
foreach($chars as $char)
|
|
{
|
|
if($char == '"') {
|
|
// Invert the toggle block state
|
|
$toggle_state = !$toggle_state;
|
|
}
|
|
|
|
// If this char is whitespace *and* we're outside a toggle block, then it's a token
|
|
if(ctype_space($char) && !$toggle_state) {
|
|
// If the string is empty, then don't bother
|
|
if(empty($next_term)) continue;
|
|
$terms[] = $next_term;
|
|
$next_term = "";
|
|
}
|
|
// If it's not whitespace, or it is whitespace and we're inside a toggle block....
|
|
else if(!ctype_space($char) || ($toggle_state && ctype_space($char)))
|
|
$next_term .= $char; // ...then add the char to the next part
|
|
}
|
|
|
|
if(strlen($next_term) > 0)
|
|
$terms[] = $next_term;
|
|
|
|
return $terms;
|
|
}
|
|
|
|
/**
|
|
* Parses an array of query tokens into an associative array of search directives.
|
|
* Supported syntax derived from these sources:
|
|
* https://help.duckduckgo.com/duckduckgo-help-pages/results/syntax/
|
|
* https://docs.microsoft.com/en-us/windows/win32/lwef/-search-2x-wds-aqsreference
|
|
|
|
* @param string[] $tokens The array of query tokens to parse.
|
|
*/
|
|
public function stas_parse($tokens) {
|
|
global $settings;
|
|
|
|
/* Supported Syntax *
|
|
*
|
|
* -term exclude a term
|
|
* +term double the weighting of a term
|
|
* terms !dest terms redirect entire query (minus the !bang) to interwiki with registered shortcut dest
|
|
* prefix:term apply prefix operator to term
|
|
*/
|
|
// var_dump($tokens);
|
|
$result = [
|
|
"terms" => [],
|
|
"exclude" => [],
|
|
"interwiki" => null
|
|
];
|
|
// foreach($operators as $op)
|
|
// $result[$op] = [];
|
|
|
|
|
|
$count = count($tokens);
|
|
for($i = count($tokens) - 1; $i >= 0; $i--) {
|
|
// Look for excludes
|
|
if($tokens[$i][0] == "-") {
|
|
$result["exclude"][] = substr($tokens[$i], 1);
|
|
continue;
|
|
}
|
|
|
|
// Look for weighted terms
|
|
if($tokens[$i][0] == "+") {
|
|
$result["terms"][] = [
|
|
"term" => substr($tokens[$i], 1),
|
|
"weight" => 2,
|
|
"location" => "all"
|
|
];
|
|
continue;
|
|
}
|
|
|
|
// Look for interwiki searches
|
|
if($tokens[$i][0] == "!" || substr($tokens[$i], -1) == "!") {
|
|
// You can only go to 1 interwiki destination at once, so we replace any previous finding with this one
|
|
$result["interwiki"] = trim($tokens[$i], "!");
|
|
}
|
|
|
|
// Look for colon directives in the form directive:term
|
|
// Also supports prefix:"quoted term with spaces", quotes stripped automatically
|
|
/*** Example directives *** (. = implemented, * = not implemented)
|
|
. intitle search only page titles for term
|
|
. intags search only tags for term
|
|
. inbody search page body only for term
|
|
* before search only pages that were last modified before term
|
|
* after search only pages that were last modified after term
|
|
* size search only pages that match the size spec term (e.g. 1k+ -> more than 1k bytes, 2k- -> less than 2k bytes, >5k -> more than 5k bytes, <10k -> less than 10k bytes)
|
|
**************************/
|
|
if(strpos($tokens[$i], ":") !== false) {
|
|
$parts = explode(":", $tokens[$i], 2);
|
|
if(!isset($result[$parts[0]]))
|
|
$result[$parts[0]] = [];
|
|
|
|
switch($parts[0]) {
|
|
case "intitle": // BUG: What if a normal word is found in a title?
|
|
$result["terms"][] = [
|
|
"term" => $parts[1],
|
|
"weight" => $settings->search_title_matches_weighting * mb_strlen($parts[1]),
|
|
"location" => "title"
|
|
];
|
|
break;
|
|
case "intags":
|
|
$result["terms"][] = [
|
|
"term" => $parts[1],
|
|
"weight" => $settings->search_tags_matches_weighting * mb_strlen($parts[1]),
|
|
"location" => "tags"
|
|
];
|
|
break;
|
|
case "inbody":
|
|
$result["terms"][] = [
|
|
"term" => $parts[1],
|
|
"weight" => 1,
|
|
"location" => "body"
|
|
];
|
|
break;
|
|
default:
|
|
$result[$parts[0]][] = trim($parts[1], '"');
|
|
break;
|
|
}
|
|
continue;
|
|
}
|
|
|
|
// Doesn't appear to be particularly special *shrugs*
|
|
// Set the weight to -1 if it's a stop word
|
|
$result["terms"][] = [
|
|
"term" => $tokens[$i],
|
|
"weight" => in_array($tokens[$i], self::$stop_words) ? -1 : 1,
|
|
"location" => "all"
|
|
];
|
|
}
|
|
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* Searches the given inverted index for the specified search terms.
|
|
* @param string $query The search query.
|
|
* @return array An array of matching pages.
|
|
*/
|
|
public static function invindex_query($query)
|
|
{
|
|
global $settings, $pageindex;
|
|
|
|
$query_stas = self::stas_parse(
|
|
self::stas_split(self::transliterate($query))
|
|
);
|
|
|
|
/* Sub-array format:
|
|
* [
|
|
* nterms : [ nterm => frequency, nterm => frequency, .... ],
|
|
* offsets_body : int[],
|
|
* matches_title : int,
|
|
* matches_tags : int
|
|
* ]
|
|
*/
|
|
$matching_pages = [];
|
|
$match_template = [
|
|
"nterms" => [],
|
|
"offsets_body" => [],
|
|
"rank_title" => 0,
|
|
"rank_tags" => 0
|
|
];
|
|
|
|
// Query the inverted index
|
|
foreach($query_stas["terms"] as $term_def) {
|
|
if($term_def["weight"] == -1)
|
|
continue; // Skip stop words
|
|
|
|
if(!in_array($term_def["location"], ["all", "inbody"]))
|
|
continue; // Skip terms we shouldn't search the page body for
|
|
|
|
if(!self::$invindex->has($term_def["term"]))
|
|
continue; // Skip if it's not in the index
|
|
|
|
// For each page that contains this term.....
|
|
$term_pageids = self::$invindex->get($term_def["term"]);
|
|
foreach($term_pageids as $pageid) {
|
|
// Check to see if it contains any words we should exclude
|
|
$skip = false;
|
|
foreach($query_stas["exclude"] as $excl_term) {
|
|
if(self::$invindex->has("$excl_term|$pageid")) {
|
|
$skip = true;
|
|
break;
|
|
}
|
|
}
|
|
if($skip) continue;
|
|
|
|
// Get the list of offsets
|
|
$page_offsets = self::$invindex->get("{$term_def["term"]}|$pageid");
|
|
|
|
if(!isset($matching_pages[$pageid]))
|
|
$matching_pages[$pageid] = $match_template; // Arrays are assigned by copy in php
|
|
|
|
// Add it to the appropriate $matching_pages entry, not forgetting to apply the weighting
|
|
$matching_pages[$pageid]["offsets_body"] = array_merge(
|
|
$matching_pages[$pageid]["offsets_body"],
|
|
$page_offsets->offsets
|
|
);
|
|
$matching_pages[$pageid]["nterms"][$term_def["term"]] = $page_offsets->freq * $term_def["weight"];
|
|
}
|
|
|
|
}
|
|
|
|
// Query page titles & tags
|
|
foreach($query_stas["terms"] as $term_def) {
|
|
// No need to skip stop words here, since we're doing a normal
|
|
// sequential search anyway
|
|
if(!in_array($term_def["location"], ["all", "title", "tags"]))
|
|
continue; // Skip terms we shouldn't search the page body for
|
|
|
|
// Loop over the pageindex and search the titles / tags
|
|
reset($pageindex); // Reset array/object pointer
|
|
foreach($pageindex as $pagename => $pagedata) {
|
|
// Setup a variable to hold the current page's id
|
|
$pageid = null; // Cache the page id
|
|
|
|
$lit_title = self::transliterate($pagename);
|
|
$lit_tags = isset($pagedata->tags) ? self::transliterate(implode(" ", $pagedata->tags)) : null;
|
|
|
|
// Make sure that the title & tags don't contain a term we should exclude
|
|
$skip = false;
|
|
foreach($query_stas["exclude"] as $excl_term) {
|
|
if(mb_strpos($lit_title, $excl_term) !== false) {
|
|
$skip = true;
|
|
// Delete it from the candidate matches (it might be present in the tags / title but not the body)
|
|
if(isset($matching_pages[$excl_term]))
|
|
unset($matching_pages[$excl_term]);
|
|
break;
|
|
}
|
|
}
|
|
if($skip) continue;
|
|
|
|
// Consider matches in the page title
|
|
if(in_array($term_def["location"], ["all", "title"])) {
|
|
// FUTURE: We may be able to optimise this further by using preg_match_all + preg_quote instead of mb_stripos_all. Experimentation / benchmarking is required to figure out which one is faster
|
|
$title_matches = mb_stripos_all($lit_title, $term_def["term"]);
|
|
$title_matches_count = $title_matches !== false ? count($title_matches) : 0;
|
|
if($title_matches_count > 0) {
|
|
$pageid = ids::getid($pagename); // Fetch the page id
|
|
// We found the qterm in the title
|
|
if(!isset($matching_pages[$pageid]))
|
|
$matching_pages[$pageid] = $match_template; // Assign by copy
|
|
|
|
$matching_pages[$pageid]["rank_title"] += $title_matches_count * $term_def["weight"];
|
|
}
|
|
}
|
|
|
|
// If this page doesn't have any tags, skip it
|
|
if($lit_tags == null)
|
|
continue;
|
|
|
|
if(!in_array($term_def["location"], ["all", "tags"]))
|
|
continue; // If we shouldn't search the tags, no point in continuing
|
|
|
|
// Consider matches in the page's tags
|
|
$tag_matches = isset($pagedata->tags) ? mb_stripos_all($lit_tags, $term_def["term"]) : false;
|
|
$tag_matches_count = $tag_matches !== false ? count($tag_matches) : 0;
|
|
|
|
if($tag_matches_count > 0) {// And we found the qterm in the tags
|
|
if($pageid === null) // Fill out the page id if it hasn't been already
|
|
$pageid = ids::getid($pagename);
|
|
|
|
if(!isset($matching_pages[$pageid]))
|
|
$matching_pages[$pageid] = $match_template; // Assign by copy
|
|
|
|
$matching_pages[$pageid]["rank_tags"] += $tag_matches_count * $term_def["weight"];
|
|
}
|
|
}
|
|
}
|
|
|
|
// TODO: Implement the rest of STAS here
|
|
|
|
reset($matching_pages);
|
|
foreach($matching_pages as $pageid => &$pagedata) {
|
|
$pagedata["pagename"] = ids::getpagename($pageid);
|
|
$pagedata["rank"] = 0;
|
|
|
|
$pageOffsets = [];
|
|
|
|
// Loop over each search term found on this page
|
|
reset($pagedata["nterms"]);
|
|
foreach($pagedata["nterms"] as $pterm => $frequency) {
|
|
// Add the number of occurrences of this search term to the ranking
|
|
// Multiply it by the length of the word
|
|
$pagedata["rank"] += $frequency * strlen($pterm);
|
|
}
|
|
|
|
// Consider matches in the title / tags
|
|
$pagedata["rank"] += $pagedata["rank_title"] + $pagedata["rank_tags"];
|
|
|
|
// TODO: Consider implementing kernel density estimation here.
|
|
// https://en.wikipedia.org/wiki/Kernel_density_estimation
|
|
// We want it to have more of an effect the more words that are present in the query. Maybe a logarithmic function would be worth investigating here?
|
|
|
|
// TODO: Remove items if the computed rank is below a threshold
|
|
}
|
|
|
|
uasort($matching_pages, function($a, $b) {
|
|
if($a["rank"] == $b["rank"]) return 0;
|
|
return ($a["rank"] < $b["rank"]) ? +1 : -1;
|
|
});
|
|
|
|
return $matching_pages;
|
|
}
|
|
|
|
/**
|
|
* Extracts a context string (in HTML) given a search query that could be displayed
|
|
* in a list of search results.
|
|
* @param string $pagename The name of the paget that this source belongs to. Used when consulting the inverted index.
|
|
* @param string $query The search queary to generate the context for.
|
|
* @param string $source The page source to extract the context from.
|
|
* @return string The generated context string.
|
|
*/
|
|
public static function extract_context($pagename, $query, $source)
|
|
{
|
|
global $settings;
|
|
|
|
$pageid = ids::getid($pagename);
|
|
$nterms = self::stas_parse(self::stas_split($query))["terms"];
|
|
|
|
// Query the inverted index for offsets
|
|
$matches = [];
|
|
foreach($nterms as $nterm) {
|
|
// Skip if the page isn't found in the inverted index for this word
|
|
if(!self::$invindex->has("{$nterm["term"]}|$pageid"))
|
|
continue;
|
|
|
|
$nterm_offsets = self::$invindex->get("{$nterm["term"]}|$pageid")->offsets;
|
|
|
|
foreach($nterm_offsets as $next_offset)
|
|
$matches[] = [ $nterm["term"], $next_offset ];
|
|
}
|
|
|
|
// Sort the matches by offset
|
|
usort($matches, function($a, $b) {
|
|
if($a[1] == $b[1]) return 0;
|
|
return ($a[1] > $b[1]) ? +1 : -1;
|
|
});
|
|
|
|
$sourceLength = mb_strlen($source);
|
|
|
|
$contexts = [];
|
|
|
|
$matches_count = count($matches);
|
|
$total_context_length = 0;
|
|
for($i = 0; $i < $matches_count; $i++) {
|
|
$next_context = [
|
|
"from" => max(0, $matches[$i][1] - $settings->search_characters_context),
|
|
"to" => min($sourceLength, $matches[$i][1] + mb_strlen($matches[$i][0]) + $settings->search_characters_context)
|
|
];
|
|
|
|
if(end($contexts) !== false && end($contexts)["to"] > $next_context["from"]) {
|
|
// This next context overlaps with the previous one
|
|
// Extend the last one instead of adding a new one
|
|
|
|
// The array pointer is pointing at the last element now because we called end() above
|
|
|
|
// Update the total context length counter appropriately
|
|
$total_context_length += $next_context["to"] - $contexts[key($contexts)]["to"];
|
|
$contexts[key($contexts)]["to"] = $next_context["to"];
|
|
}
|
|
else { // No overlap here! Business as usual.
|
|
$contexts[] = $next_context;
|
|
// Update the total context length counter as normal
|
|
$total_context_length += $next_context["to"] - $next_context["from"];
|
|
}
|
|
|
|
|
|
end($contexts);
|
|
$last_context = &$contexts[key($contexts)];
|
|
if($total_context_length > $settings->search_characters_context_total) {
|
|
// We've reached the limit on the number of characters this context should contain. Trim off the context to fit and break out
|
|
$last_context["to"] -= $total_context_length - $settings->search_characters_context_total;
|
|
break;
|
|
}
|
|
}
|
|
|
|
$contexts_text = [];
|
|
foreach($contexts as $context) {
|
|
$contexts_text[] = substr($source, $context["from"], $context["to"] - $context["from"]);
|
|
}
|
|
|
|
// BUG: Make sure that a snippet is centred on the word in question if we have to cut it short
|
|
|
|
$result = implode(" … ", $contexts_text);
|
|
end($contexts); // If there's at least one item in the list and were not at the very end of the page, add an extra ellipsis
|
|
if(isset($contexts[0]) && $contexts[key($contexts)]["to"] < $sourceLength) $result .= "… ";
|
|
// Prepend an ellipsis if the context doesn't start at the beginning of a page
|
|
if(isset($contexts[0]) && $contexts[0]["from"] > 0) $result = " …$result";
|
|
|
|
return $result;
|
|
}
|
|
|
|
/**
|
|
* Highlights the keywords of a context string.
|
|
* @param string $query The query to use when highlighting.
|
|
* @param string $context The context string to highlight.
|
|
* @return string The highlighted (HTML) string.
|
|
*/
|
|
public static function highlight_context($query, $context)
|
|
{
|
|
$qterms = self::stas_parse(self::stas_split($query))["terms"];
|
|
|
|
foreach($qterms as $qterm) {
|
|
// Stop words are marked by STAS
|
|
if($qterm["weight"] == -1)
|
|
continue;
|
|
|
|
// From http://stackoverflow.com/a/2483859/1460422
|
|
$context = preg_replace("/" . preg_replace('/\\//u', "\/", preg_quote($qterm["term"])) . "/iu", "<strong class='search-term-highlight'>$0</strong>", $context);
|
|
}
|
|
|
|
return $context;
|
|
}
|
|
}
|
|
|
|
?>
|