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<?php
namespace TeamTNT\TNTSearch;
use PDO;
use TeamTNT\TNTSearch\Exceptions\IndexNotFoundException;
use TeamTNT\TNTSearch\Indexer\TNTIndexer;
use TeamTNT\TNTSearch\Stemmer\PorterStemmer;
use TeamTNT\TNTSearch\Support\Collection;
use TeamTNT\TNTSearch\Support\Expression;
use TeamTNT\TNTSearch\Support\Highlighter;
use TeamTNT\TNTSearch\Support\Tokenizer;
use TeamTNT\TNTSearch\Support\TokenizerInterface;
class TNTSearch
{
public $config;
public $asYouType = false;
public $maxDocs = 500;
public $tokenizer = null;
public $index = null;
public $stemmer = null;
public $fuzziness = false;
public $fuzzy_prefix_length = 2;
public $fuzzy_max_expansions = 50;
public $fuzzy_distance = 2;
protected $dbh = null;
/**
* @param array $config
*
* @see https://github.com/teamtnt/tntsearch#examples
*/
public function loadConfig(array $config)
{
$this->config = $config;
$this->config['storage'] = rtrim($this->config['storage'], '/').'/';
}
public function __construct()
{
$this->tokenizer = new Tokenizer;
}
/**
* @param PDO $dbh
*/
public function setDatabaseHandle(PDO $dbh)
{
$this->dbh = $dbh;
}
/**
* @param string $indexName
* @param boolean $disableOutput
*
* @return TNTIndexer
*/
public function createIndex($indexName, $disableOutput = false)
{
$indexer = new TNTIndexer;
$indexer->loadConfig($this->config);
$indexer->disableOutput = $disableOutput;
if ($this->dbh) {
$indexer->setDatabaseHandle($this->dbh);
}
return $indexer->createIndex($indexName);
}
/**
* @param string $indexName
*
* @throws IndexNotFoundException
*/
public function selectIndex($indexName)
{
$pathToIndex = $this->config['storage'].$indexName;
if (!file_exists($pathToIndex)) {
throw new IndexNotFoundException("Index {$pathToIndex} does not exist", 1);
}
$this->index = new PDO('sqlite:'.$pathToIndex);
$this->index->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$this->setStemmer();
$this->setTokenizer();
}
/**
* @param string $phrase
* @param int $numOfResults
*
* @return array
*/
public function search($phrase, $numOfResults = 100)
{
$startTimer = microtime(true);
$keywords = $this->breakIntoTokens($phrase);
$keywords = new Collection($keywords);
$keywords = $keywords->map(function ($keyword) {
return $this->stemmer->stem($keyword);
});
$tfWeight = 1;
$dlWeight = 0.5;
$docScores = [];
$count = $this->totalDocumentsInCollection();
foreach ($keywords as $index => $term) {
$isLastKeyword = ($keywords->count() - 1) == $index;
$df = $this->totalMatchingDocuments($term, $isLastKeyword);
$idf = log($count / max(1, $df));
foreach ($this->getAllDocumentsForKeyword($term, false, $isLastKeyword) as $document) {
$docID = $document['doc_id'];
$tf = $document['hit_count'];
$num = ($tfWeight + 1) * $tf;
$denom = $tfWeight
* ((1 - $dlWeight) + $dlWeight)
+ $tf;
$score = $idf * ($num / $denom);
$docScores[$docID] = isset($docScores[$docID]) ?
$docScores[$docID] + $score : $score;
}
}
arsort($docScores);
$docs = new Collection($docScores);
$totalHits = $docs->count();
$docs = $docs->map(function ($doc, $key) {
return $key;
})->take($numOfResults);
$stopTimer = microtime(true);
if ($this->isFileSystemIndex()) {
return $this->filesystemMapIdsToPaths($docs)->toArray();
}
return [
'ids' => array_keys($docs->toArray()),
'hits' => $totalHits,
'execution_time' => round($stopTimer - $startTimer, 7) * 1000 ." ms"
];
}
/**
* @param string $phrase
* @param int $numOfResults
*
* @return array
*/
public function searchBoolean($phrase, $numOfResults = 100)
{
$stack = [];
$startTimer = microtime(true);
$expression = new Expression;
$postfix = $expression->toPostfix("|".$phrase);
foreach ($postfix as $token) {
if ($token == '&') {
$left = array_pop($stack);
$right = array_pop($stack);
if (is_string($left)) {
$left = $this->getAllDocumentsForKeyword($this->stemmer->stem($left), true)
->pluck('doc_id');
}
if (is_string($right)) {
$right = $this->getAllDocumentsForKeyword($this->stemmer->stem($right), true)
->pluck('doc_id');
}
if (is_null($left)) {
$left = [];
}
if (is_null($right)) {
$right = [];
}
$stack[] = array_values(array_intersect($left, $right));
} else
if ($token == '|') {
$left = array_pop($stack);
$right = array_pop($stack);
if (is_string($left)) {
$left = $this->getAllDocumentsForKeyword($this->stemmer->stem($left), true)
->pluck('doc_id');
}
if (is_string($right)) {
$right = $this->getAllDocumentsForKeyword($this->stemmer->stem($right), true)
->pluck('doc_id');
}
if (is_null($left)) {
$left = [];
}
if (is_null($right)) {
$right = [];
}
$stack[] = array_unique(array_merge($left, $right));
} else
if ($token == '~') {
$left = array_pop($stack);
if (is_string($left)) {
$left = $this->getAllDocumentsForWhereKeywordNot($this->stemmer->stem($left), true)
->pluck('doc_id');
}
if (is_null($left)) {
$left = [];
}
$stack[] = $left;
} else {
$stack[] = $token;
}
}
if (count($stack)) {
$docs = new Collection($stack[0]);
} else {
$docs = new Collection;
}
$docs = $docs->take($numOfResults);
$stopTimer = microtime(true);
if ($this->isFileSystemIndex()) {
return $this->filesystemMapIdsToPaths($docs)->toArray();
}
return [
'ids' => $docs->toArray(),
'hits' => $docs->count(),
'execution_time' => round($stopTimer - $startTimer, 7) * 1000 ." ms"
];
}
/**
* @param $keyword
* @param bool $noLimit
* @param bool $isLastKeyword
*
* @return Collection
*/
public function getAllDocumentsForKeyword($keyword, $noLimit = false, $isLastKeyword = false)
{
$word = $this->getWordlistByKeyword($keyword, $isLastKeyword);
if (!isset($word[0])) {
return new Collection([]);
}
if ($this->fuzziness) {
return $this->getAllDocumentsForFuzzyKeyword($word, $noLimit);
}
return $this->getAllDocumentsForStrictKeyword($word, $noLimit);
}
/**
* @param $keyword
* @param bool $noLimit
*
* @return Collection
*/
public function getAllDocumentsForWhereKeywordNot($keyword, $noLimit = false)
{
$word = $this->getWordlistByKeyword($keyword);
if (!isset($word[0])) {
return new Collection([]);
}
$query = "SELECT * FROM doclist WHERE doc_id NOT IN (SELECT doc_id FROM doclist WHERE term_id = :id) GROUP BY doc_id ORDER BY hit_count DESC LIMIT {$this->maxDocs}";
if ($noLimit) {
$query = "SELECT * FROM doclist WHERE doc_id NOT IN (SELECT doc_id FROM doclist WHERE term_id = :id) GROUP BY doc_id ORDER BY hit_count DESC";
}
$stmtDoc = $this->index->prepare($query);
$stmtDoc->bindValue(':id', $word[0]['id']);
$stmtDoc->execute();
return new Collection($stmtDoc->fetchAll(PDO::FETCH_ASSOC));
}
/**
* @param $keyword
* @param bool $isLastWord
*
* @return int
*/
public function totalMatchingDocuments($keyword, $isLastWord = false)
{
$occurance = $this->getWordlistByKeyword($keyword, $isLastWord);
if (isset($occurance[0])) {
return $occurance[0]['num_docs'];
}
return 0;
}
/**
* @param $keyword
* @param bool $isLastWord
*
* @return array
*/
public function getWordlistByKeyword($keyword, $isLastWord = false)
{
$searchWordlist = "SELECT * FROM wordlist WHERE term like :keyword LIMIT 1";
$stmtWord = $this->index->prepare($searchWordlist);
if ($this->asYouType && $isLastWord) {
$searchWordlist = "SELECT * FROM wordlist WHERE term like :keyword ORDER BY length(term) ASC, num_hits DESC LIMIT 1";
$stmtWord = $this->index->prepare($searchWordlist);
$stmtWord->bindValue(':keyword', mb_strtolower($keyword)."%");
} else {
$stmtWord->bindValue(':keyword', mb_strtolower($keyword));
}
$stmtWord->execute();
$res = $stmtWord->fetchAll(PDO::FETCH_ASSOC);
if ($this->fuzziness && !isset($res[0])) {
return $this->fuzzySearch($keyword);
}
return $res;
}
/**
* @param $keyword
*
* @return array
*/
public function fuzzySearch($keyword)
{
$prefix = substr($keyword, 0, $this->fuzzy_prefix_length);
$searchWordlist = "SELECT * FROM wordlist WHERE term like :keyword ORDER BY num_hits DESC LIMIT {$this->fuzzy_max_expansions}";
$stmtWord = $this->index->prepare($searchWordlist);
$stmtWord->bindValue(':keyword', mb_strtolower($prefix)."%");
$stmtWord->execute();
$matches = $stmtWord->fetchAll(PDO::FETCH_ASSOC);
$resultSet = [];
foreach ($matches as $match) {
$distance = levenshtein($match['term'], $keyword);
if ($distance <= $this->fuzzy_distance) {
$match['distance'] = $distance;
$resultSet[] = $match;
}
}
// Sort the data by distance, and than by num_hits
$distance = [];
$hits = [];
foreach ($resultSet as $key => $row) {
$distance[$key] = $row['distance'];
$hits[$key] = $row['num_hits'];
}
array_multisort($distance, SORT_ASC, $hits, SORT_DESC, $resultSet);
return $resultSet;
}
public function totalDocumentsInCollection()
{
return $this->getValueFromInfoTable('total_documents');
}
public function getStemmer()
{
return $this->stemmer;
}
public function setStemmer()
{
$stemmer = $this->getValueFromInfoTable('stemmer');
if ($stemmer) {
$this->stemmer = new $stemmer;
} else {
$this->stemmer = isset($this->config['stemmer']) ? new $this->config['stemmer'] : new PorterStemmer;
}
}
public function setTokenizer()
{
$tokenizer = $this->getValueFromInfoTable('tokenizer');
if ($tokenizer) {
$this->tokenizer = new $tokenizer;
} else {
$this->tokenizer = isset($this->config['tokenizer']) ? new $this->config['tokenizer'] : new Tokenizer;
}
}
/**
* @return bool
*/
public function isFileSystemIndex()
{
return $this->getValueFromInfoTable('driver') == 'filesystem';
}
public function getValueFromInfoTable($value)
{
$query = "SELECT * FROM info WHERE key = '$value'";
$docs = $this->index->query($query);
if ($ret = $docs->fetch(PDO::FETCH_ASSOC)) {
return $ret['value'];
}
return null;
}
public function filesystemMapIdsToPaths($docs)
{
$query = "SELECT * FROM filemap WHERE id in (".$docs->implode(', ').");";
$res = $this->index->query($query)->fetchAll(PDO::FETCH_ASSOC);
return $docs->map(function ($key) use ($res) {
$index = array_search($key, array_column($res, 'id'));
return $res[$index];
});
}
public function info($str)
{
echo $str."\n";
}
public function breakIntoTokens($text)
{
return $this->tokenizer->tokenize($text);
}
/**
* @param $text
* @param $needle
* @param string $tag
* @param array $options
*
* @return string
*/
public function highlight($text, $needle, $tag = 'em', $options = [])
{
$hl = new Highlighter($this->tokenizer);
return $hl->highlight($text, $needle, $tag, $options);
}
public function snippet($words, $fulltext, $rellength = 300, $prevcount = 50, $indicator = '...')
{
$hl = new Highlighter($this->tokenizer);
return $hl->extractRelevant($words, $fulltext, $rellength, $prevcount, $indicator);
}
/**
* @return TNTIndexer
*/
public function getIndex()
{
$indexer = new TNTIndexer;
$indexer->inMemory = false;
$indexer->setIndex($this->index);
$indexer->setStemmer($this->stemmer);
$indexer->setTokenizer($this->tokenizer);
return $indexer;
}
/**
* @param $words
* @param $noLimit
*
* @return Collection
*/
private function getAllDocumentsForFuzzyKeyword($words, $noLimit)
{
$binding_params = implode(',', array_fill(0, count($words), '?'));
$query = "SELECT * FROM doclist WHERE term_id in ($binding_params) ORDER BY CASE term_id";
$order_counter = 1;
foreach ($words as $word) {
$query .= " WHEN ".$word['id']." THEN ".$order_counter++;
}
$query .= " END";
if (!$noLimit) {
$query .= " LIMIT {$this->maxDocs}";
}
$stmtDoc = $this->index->prepare($query);
$ids = null;
foreach ($words as $word) {
$ids[] = $word['id'];
}
$stmtDoc->execute($ids);
return new Collection($stmtDoc->fetchAll(PDO::FETCH_ASSOC));
}
/**
* @param $word
* @param $noLimit
*
* @return Collection
*/
private function getAllDocumentsForStrictKeyword($word, $noLimit)
{
$query = "SELECT * FROM doclist WHERE term_id = :id ORDER BY hit_count DESC LIMIT {$this->maxDocs}";
if ($noLimit) {
$query = "SELECT * FROM doclist WHERE term_id = :id ORDER BY hit_count DESC";
}
$stmtDoc = $this->index->prepare($query);
$stmtDoc->bindValue(':id', $word[0]['id']);
$stmtDoc->execute();
return new Collection($stmtDoc->fetchAll(PDO::FETCH_ASSOC));
}
}