mirror of
https://github.com/sbrl/Pepperminty-Wiki.git
synced 2024-12-23 01:55:01 +00:00
463 lines
15 KiB
PHP
463 lines
15 KiB
PHP
<?php
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register_module([
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"name" => "Search",
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"version" => "0.2",
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"author" => "Starbeamrainbowlabs",
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"description" => "Adds proper search functionality to Pepperminty Wiki. Note that this module, at the moment, just contains test code while I figure out how best to write a search engine.",
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"id" => "feature-search",
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"code" => function() {
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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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$index = search::index($source);
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var_dump($env->page);
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var_dump($source);
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var_dump($index);
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});
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add_action("invindex-rebuild", function() {
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search::rebuild_invindex();
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});
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add_action("search", function() {
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global $settings, $env, $pageindex, $paths;
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if(!isset($_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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$invindex = search::load_invindex($paths->searchindex);
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$results = search::query_invindex($_GET["query"], $invindex);
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$search_end = microtime(true) - $search_start;
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$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='" . $_GET["query"] . "' />\n";
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$content .= " <input type='hidden' name='action' value='search' />\n";
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$content .= "</form>";
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$query = $_GET["query"];
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if(isset($pageindex->$query))
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{
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$content .= "<p>There's a page on $settings->sitename called <a href='?page=" . rawurlencode($query) . "'>$query</a>.</p>";
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}
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else
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{
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$content .= "<p>There isn't a page called $query on $settings->sitename, but you can <a href='?action=edit&page=" . rawurlencode($query) . "'>create it</a>.</p>";
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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 . $result["pagename"] . ".md");
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$context = search::extract_context($_GET["query"], $pagesource);
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$context = search::highlight_context($_GET["query"], $context);
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/*if(strlen($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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// 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'>" . $result["pagename"] . "</a></h2>\n";
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$content .= " <p>$context</p>\n";
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$content .= "</div>\n";
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$i++;
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}
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$content .= "</section>\n";
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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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class search
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{
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// Words that we should exclude from the inverted index.
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public static $stop_words = [
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"a", "about", "above", "above", "across", "after", "afterwards", "again",
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"against", "all", "almost", "alone", "along", "already", "also",
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"although", "always", "am", "among", "amongst", "amoungst", "amount",
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"an", "and", "another", "any", "anyhow", "anyone", "anything", "anyway",
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"anywhere", "are", "around", "as", "at", "back", "be", "became",
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"because", "become", "becomes", "becoming", "been", "before",
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"beforehand", "behind", "being", "below", "beside", "besides",
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"between", "beyond", "bill", "both", "bottom", "but", "by", "call",
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"can", "cannot", "cant", "co", "con", "could", "couldnt", "cry", "de",
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"describe", "detail", "do", "done", "down", "due", "during", "each",
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"eg", "eight", "either", "eleven", "else", "elsewhere", "empty",
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"enough", "etc", "even", "ever", "every", "everyone", "everything",
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"everywhere", "except", "few", "fifteen", "fify", "fill", "find",
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"fire", "first", "five", "for", "former", "formerly", "forty", "found",
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"four", "from", "front", "full", "further", "get", "give", "go", "had",
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"has", "hasnt", "have", "he", "hence", "her", "here", "hereafter",
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"hereby", "herein", "hereupon", "hers", "herself", "him", "himself",
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"his", "how", "however", "hundred", "ie", "if", "in", "inc", "indeed",
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"interest", "into", "is", "it", "its", "itself", "keep", "last",
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"latter", "latterly", "least", "less", "ltd", "made", "many", "may",
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"me", "meanwhile", "might", "mine", "more", "moreover", "most",
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"mostly", "move", "much", "must", "my", "myself", "name", "namely",
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"neither", "never", "nevertheless", "next", "nine", "no", "none",
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"nor", "not", "nothing", "now", "nowhere", "of", "off", "often", "on",
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"once", "one", "only", "onto", "or", "other", "others", "otherwise",
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"our", "ours", "ourselves", "out", "over", "own", "part", "per",
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"perhaps", "please", "put", "rather", "re", "same", "see", "seem",
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"seemed", "seeming", "seems", "serious", "several", "she", "should",
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"show", "side", "since", "sincere", "six", "sixty", "so", "some",
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"somehow", "someone", "something", "sometime", "sometimes",
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"somewhere", "still", "such", "system", "take", "ten", "than", "that",
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"the", "their", "them", "themselves", "then", "thence", "there",
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"thereafter", "thereby", "therefore", "therein", "thereupon", "these",
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"they", "thickv", "thin", "third", "this", "those", "though", "three",
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"through", "throughout", "thru", "thus", "to", "together", "too", "top",
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"toward", "towards", "twelve", "twenty", "two", "un", "under", "until",
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"up", "upon", "us", "very", "via", "was", "we", "well", "were", "what",
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"whatever", "when", "whence", "whenever", "where", "whereafter",
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"whereas", "whereby", "wherein", "whereupon", "wherever", "whether",
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"which", "while", "whither", "who", "whoever", "whole", "whom", "whose",
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"why", "will", "with", "within", "without", "would", "yet", "you",
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"your", "yours", "yourself", "yourselves"
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];
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public static function index($source)
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{
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$source = html_entity_decode($source, ENT_QUOTES);
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$source_length = strlen($source);
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$index = [];
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$terms = self::tokenize($source);
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$i = 0;
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foreach($terms as $term)
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{
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$nterm = $term;
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// Skip over stop words (see https://en.wikipedia.org/wiki/Stop_words)
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if(in_array($nterm, self::$stop_words)) continue;
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if(!isset($index[$nterm]))
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{
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$index[$nterm] = [ "freq" => 0, "offsets" => [] ];
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}
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$index[$nterm]["freq"]++;
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$index[$nterm]["offsets"][] = $i;
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$i++;
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}
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return $index;
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}
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public static function tokenize($source)
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{
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$source = strtolower($source);
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return preg_split("/((^\p{P}+)|(\p{P}*\s+\p{P}*)|(\p{P}+$))|\|/", $source, -1, PREG_SPLIT_NO_EMPTY);
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}
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public static function strip_markup($source)
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{
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return str_replace([ "[", "]", "\"", "*", "_", " - ", "`" ], "", $source);
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}
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public static function rebuild_invindex()
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{
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global $pageindex;
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$invindex = [];
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foreach($pageindex as $pagename => $pagedetails)
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{
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$pagesource = file_get_contents("$env->storage_prefix$pagename.md");
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$index = self::index($pagesource);
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self::merge_into_invindex($invindex, ids::getid($pagename), $index);
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}
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self::save_invindex("invindex.json", $invindex);
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}
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/*
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* @summary Sorts an index alphabetically. Will also sort an inverted index.
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* This allows us to do a binary search instead of a regular
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* sequential search.
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*/
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public static function sort_index(&$index)
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{
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ksort($index, SORT_NATURAL);
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}
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/*
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* @summary Compares two *regular* indexes to find the differences between them.
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*
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* @param {array} $indexa - The old index.
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* @param {array} $indexb - The new index.
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* @param {array} $changed - An array to be filled with the nterms of all
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* the changed entries.
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* @param {array} $removed - An array to be filled with the nterms of all
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* the removed entries.
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*/
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public static function compare_indexes($oldindex, $newindex, &$changed, &$removed)
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{
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foreach($oldindex as $nterm => $entry)
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{
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if(!isset($newindex[$nterm]))
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$removed[] = $nterm;
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}
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foreach($newindex as $nterm => $entry)
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{
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if(!isset($oldindex[$nterm]) or // If this world is new
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$newindex[$nterm] !== $oldindex[$nterm]) // If this word has changed
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$changed[$nterm] = $newindex[$nterm];
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}
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}
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/*
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* @summary Reads in and parses an inverted index.
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*/
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// Todo remove this function and make everything streamable
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public static function load_invindex($invindex_filename) {
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$invindex = json_decode(file_get_contents($invindex_filename), true);
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return $invindex;
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}
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/*
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* @summary Merge an index into an inverted index.
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*/
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public static function merge_into_invindex(&$invindex, $pageid, &$index, &$removals = [])
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{
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// Remove all the subentries that were removed since last time
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foreach($removals as $nterm)
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{
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unset($invindex[$nterm][$pageid]);
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}
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// Merge all the new / changed index entries into the inverted index
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foreach($index as $nterm => $newentry)
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{
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// If the nterm isn't in the inverted index, then create a space for it
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if(!isset($invindex[$nterm])) $invindex[$nterm] = [];
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$invindex[$nterm][$pageid] = $newentry;
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// Sort the page entries for this word by frequency
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uasort($invindex[$nterm], function($a, $b) {
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if($a["freq"] == $b["freq"]) return 0;
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return ($a["freq"] < $b["freq"]) ? +1 : -1;
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});
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}
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// Sort the inverted index by rank
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uasort($invindex, function($a, $b) {
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$ac = count($a); $bc = count($b);
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if($ac == $bc) return 0;
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return ($ac < $bc) ? +1 : -1;
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});
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}
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public static function save_invindex($filename, &$invindex)
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{
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file_put_contents($filename, json_encode($invindex));
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}
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public static function query_invindex($query, &$invindex)
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{
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global $settings, $pageindex;
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$query_terms = self::tokenize($query);
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$matching_pages = [];
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// Loop over each term in the query and find the matching page entries
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for($i = 0; $i < count($query_terms); $i++)
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{
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$qterm = $query_terms[$i];
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// Only search the inverted index if it actually exists there
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if(isset($invindex[$qterm]))
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{
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// Loop over each page in the inverted index entry
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foreach($invindex[$qterm] as $pageid => $page_entry)
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{
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// Create an entry in the matching pages array if it doesn't exist
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if(!isset($matching_pages[$pageid]))
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$matching_pages[$pageid] = [ "nterms" => [] ];
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$matching_pages[$pageid]["nterms"][$qterm] = $page_entry;
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}
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}
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// Loop over the pageindex and search the titles / tags
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foreach ($pageindex as $pagename => $pagedata)
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{
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// Get the current page's id
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$pageid = ids::getid($pagename);
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// Consider matches in the page title
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if(stripos($pagename, $qterm) !== false)
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{
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// We found the qterm in the title
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if(!isset($matching_pages[$pageid]))
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$matching_pages[$pageid] = [ "nterms" => [] ];
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// Set up a counter for page title matches if it doesn't exist already
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if(!isset($matching_pages[$pageid]["title-matches"]))
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$matching_pages[$pageid]["title-matches"] = 0;
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$matching_pages[$pageid]["title-matches"] += count(mb_stripos_all($pagename, $qterm));
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}
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// Consider matches in the page's tags
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if(isset($pagedata->tags) and // If this page has tags
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stripos(implode(" ", $pagedata->tags), $qterm) !== false) // And we found the qterm in the tags
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{
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if(!isset($matching_pages[$pageid]))
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$matching_pages[$pageid] = [ "nterms" => [] ];
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// Set up a counter for tag match if there isn't one already
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if(!isset($matching_pages[$pageid]["tag-matches"]))
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$matching_pages[$pageid]["tag-matches"] = 0;
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$matching_pages[$pageid]["tag-matches"] += count(mb_stripos_all(implode(" ", $pagedata->tags), $qterm));
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}
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}
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}
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foreach($matching_pages as $pageid => &$pagedata)
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{
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$pagedata["pagename"] = ids::getpagename($pageid);
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$pagedata["rank"] = 0;
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foreach($pagedata["nterms"] as $pterm => $entry)
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{
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$pagedata["rank"] += $entry["freq"];
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// todo rank by context here
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}
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// Consider matches in the title / tags
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if(isset($pagedata["title-matches"]))
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$pagedata["rank"] += $pagedata["title-matches"] * $settings->search_title_matches_weighting;
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if(isset($pagedata["tag-matches"]))
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$pagedata["rank"] += $pagedata["tag-matches"] * $settings->search_tags_matches_weighting;
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// todo remove items if the rank is below a threshold
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}
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// todo sort by rank here
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uasort($matching_pages, function($a, $b) {
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if($a["rank"] == $b["rank"]) return 0;
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return ($a["rank"] < $b["rank"]) ? +1 : -1;
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});
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return $matching_pages;
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}
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public static function extract_context($query, $source)
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{
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global $settings;
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$nterms = self::tokenize($query);
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$matches = [];
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// Loop over each nterm and find it in the source
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foreach($nterms as $nterm)
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{
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$all_offsets = mb_stripos_all($source, $nterm);
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// Skip over adding matches if there aren't any
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if($all_offsets === false)
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continue;
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foreach($all_offsets as $offset)
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{
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$matches[] = [ $nterm, $offset ];
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}
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}
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usort($matches, function($a, $b) {
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if($a[1] == $b[1]) return 0;
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return ($a[1] < $b[1]) ? +1 : -1;
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});
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$contexts = [];
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$basepos = 0;
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$matches_count = count($matches);
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while($basepos < $matches_count)
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{
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// Store the next match along - all others will be relative to that
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// one
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$group = [$matches[$basepos]];
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// Start scanning at the next one along - we always store the first match
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$scanpos = $basepos + 1;
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$distance = 0;
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while(true)
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{
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// Break out if we reach the end
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if($scanpos >= $matches_count) break;
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// Find the distance between the current one and the last one
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$distance = $matches[$scanpos][1] - $matches[$scanpos - 1][1];
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// Store it if the distance is below the threshold
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if($distance < $settings->search_characters_context)
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$group[] = $matches[$scanpos];
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else
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break;
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$scanpos++;
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}
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$context_start = $group[0][1] - $settings->search_characters_context;
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$context_end = $group[count($group) - 1][1] + $settings->search_characters_context;
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$context = substr($source, $context_start, $context_end - $context_start);
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// Strip the markdown from the context - it's most likely going to
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// be broken anyway.
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$context = self::strip_markup($context);
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$contexts[] = $context;
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$basepos = $scanpos + 1;
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}
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return implode(" ... ", $contexts);
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}
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public static function highlight_context($query, $context)
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{
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$qterms = self::tokenize($query);
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foreach($qterms as $qterm)
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{
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// From http://stackoverflow.com/a/2483859/1460422
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$context = preg_replace("/" . preg_quote($qterm) . "/i", "<strong>$0</strong>", $context);
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}
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return $context;
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}
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}
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?>
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