BookStack/app/Entities/Tools/SearchIndex.php

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<?php namespace BookStack\Entities\Tools;
use BookStack\Entities\EntityProvider;
use BookStack\Entities\Models\Entity;
use BookStack\Entities\Models\SearchTerm;
class SearchIndex
{
/**
* @var SearchTerm
*/
protected $searchTerm;
/**
* @var EntityProvider
*/
protected $entityProvider;
public function __construct(SearchTerm $searchTerm, EntityProvider $entityProvider)
{
$this->searchTerm = $searchTerm;
$this->entityProvider = $entityProvider;
}
/**
* Index the given entity.
*/
public function indexEntity(Entity $entity)
{
$this->deleteEntityTerms($entity);
$nameTerms = $this->generateTermArrayFromText($entity->name, 5 * $entity->searchFactor);
$bodyTerms = $this->generateTermArrayFromText($entity->getText(), 1 * $entity->searchFactor);
$terms = array_merge($nameTerms, $bodyTerms);
foreach ($terms as $index => $term) {
$terms[$index]['entity_type'] = $entity->getMorphClass();
$terms[$index]['entity_id'] = $entity->id;
}
$this->searchTerm->newQuery()->insert($terms);
}
/**
* Index multiple Entities at once
* @param Entity[] $entities
*/
protected function indexEntities(array $entities)
{
$terms = [];
foreach ($entities as $entity) {
$nameTerms = $this->generateTermArrayFromText($entity->name, 5 * $entity->searchFactor);
$bodyTerms = $this->generateTermArrayFromText($entity->getText(), 1 * $entity->searchFactor);
foreach (array_merge($nameTerms, $bodyTerms) as $term) {
$term['entity_id'] = $entity->id;
$term['entity_type'] = $entity->getMorphClass();
$terms[] = $term;
}
}
$chunkedTerms = array_chunk($terms, 500);
foreach ($chunkedTerms as $termChunk) {
$this->searchTerm->newQuery()->insert($termChunk);
}
}
/**
* Delete and re-index the terms for all entities in the system.
*/
public function indexAllEntities()
{
$this->searchTerm->newQuery()->truncate();
foreach ($this->entityProvider->all() as $entityModel) {
$selectFields = ['id', 'name', $entityModel->textField];
$entityModel->newQuery()
->withTrashed()
->select($selectFields)
->chunk(1000, function ($entities) {
$this->indexEntities($entities);
});
}
}
/**
* Delete related Entity search terms.
*/
public function deleteEntityTerms(Entity $entity)
{
$entity->searchTerms()->delete();
}
/**
* Create a scored term array from the given text.
*/
protected function generateTermArrayFromText(string $text, int $scoreAdjustment = 1): array
{
$tokenMap = []; // {TextToken => OccurrenceCount}
$splitChars = " \n\t.,!?:;()[]{}<>`'\"";
$token = strtok($text, $splitChars);
while ($token !== false) {
if (!isset($tokenMap[$token])) {
$tokenMap[$token] = 0;
}
$tokenMap[$token]++;
$token = strtok($splitChars);
}
$terms = [];
foreach ($tokenMap as $token => $count) {
$terms[] = [
'term' => $token,
'score' => $count * $scoreAdjustment
];
}
return $terms;
}
}