silverstripe-cms/code/Search/SearchForm.php

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<?php
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namespace SilverStripe\CMS\Search;
use BadMethodCallException;
use SilverStripe\Assets\File;
use SilverStripe\CMS\Model\SiteTree;
use SilverStripe\Control\RequestHandler;
use SilverStripe\Forms\FieldList;
use SilverStripe\Forms\Form;
use SilverStripe\Forms\FormAction;
use SilverStripe\Forms\HiddenField;
use SilverStripe\Forms\TextField;
use SilverStripe\ORM\DB;
use SilverStripe\ORM\SS_List;
/**
* Standard basic search form which conducts a fulltext search on all {@link SiteTree}
* objects.
*
* @see Use ModelController and SearchContext for a more generic search implementation based around DataObject
*/
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class SearchForm extends Form
{
/**
* How many results are shown per page.
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* Relies on pagination being implemented in the search results template.
*
* @var int
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*/
protected $pageLength = 10;
/**
* Classes to search
*
* @var array
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*/
protected $classesToSearch = [
SiteTree::class,
File::class
];
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private static $casting = [
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'SearchQuery' => 'Text'
];
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/**
* @param RequestHandler $controller
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* @param string $name The name of the form (used in URL addressing)
* @param FieldList $fields Optional, defaults to a single field named "Search". Search logic needs to be customized
* if fields are added to the form.
* @param FieldList $actions Optional, defaults to a single field named "Go".
*/
public function __construct(
RequestHandler $controller = null,
$name = 'SearchForm',
FieldList $fields = null,
FieldList $actions = null
) {
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if (!$fields) {
$fields = new FieldList(
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new TextField('Search', _t(__CLASS__.'.SEARCH', 'Search'))
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);
}
if (!$actions) {
$actions = new FieldList(
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new FormAction("results", _t(__CLASS__.'.GO', 'Go'))
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);
}
parent::__construct($controller, $name, $fields, $actions);
$this->setFormMethod('get');
$this->disableSecurityToken();
}
/**
* Set the classes to search.
* Currently you can only choose from "SiteTree" and "File", but a future version might improve this.
*
* @param array $classes
*/
public function classesToSearch($classes)
{
$supportedClasses = [SiteTree::class, File::class];
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$illegalClasses = array_diff($classes ?? [], $supportedClasses);
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if ($illegalClasses) {
throw new BadMethodCallException(
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"SearchForm::classesToSearch() passed illegal classes '" . implode("', '", $illegalClasses)
. "'. At this stage, only File and SiteTree are allowed"
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);
}
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$legalClasses = array_intersect($classes ?? [], $supportedClasses);
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$this->classesToSearch = $legalClasses;
}
/**
* Get the classes to search
*
* @return array
*/
public function getClassesToSearch()
{
return $this->classesToSearch;
}
/**
* Return dataObjectSet of the results using current request to get info from form.
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* Wraps around {@link searchEngine()}.
*
* @return SS_List
*/
public function getResults()
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{
// Get request data from request handler
$request = $this->getRequestHandler()->getRequest();
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$keywords = $request->requestVar('Search');
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$andProcessor = function ($matches) {
return ' +' . $matches[2] . ' +' . $matches[4] . ' ';
};
$notProcessor = function ($matches) {
return ' -' . $matches[3];
};
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$keywords = preg_replace_callback('/()("[^()"]+")( and )("[^"()]+")()/i', $andProcessor, $keywords ?? '');
$keywords = preg_replace_callback('/(^| )([^() ]+)( and )([^ ()]+)( |$)/i', $andProcessor, $keywords ?? '');
$keywords = preg_replace_callback('/(^| )(not )("[^"()]+")/i', $notProcessor, $keywords ?? '');
$keywords = preg_replace_callback('/(^| )(not )([^() ]+)( |$)/i', $notProcessor, $keywords ?? '');
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$keywords = $this->addStarsToKeywords($keywords);
$pageLength = $this->getPageLength();
$start = max(0, (int)$request->requestVar('start'));
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$booleanSearch =
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strpos($keywords ?? '', '"') !== false ||
strpos($keywords ?? '', '+') !== false ||
strpos($keywords ?? '', '-') !== false ||
strpos($keywords ?? '', '*') !== false;
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$results = DB::get_conn()->searchEngine($this->classesToSearch, $keywords, $start, $pageLength, "\"Relevance\" DESC", "", $booleanSearch);
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// filter by permission
if ($results) {
foreach ($results as $result) {
if (!$result->canView()) {
$results->remove($result);
}
}
}
return $results;
}
protected function addStarsToKeywords($keywords)
{
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if (!trim($keywords ?? '')) {
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return "";
}
// Add * to each keyword
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$splitWords = preg_split("/ +/", trim($keywords ?? ''));
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$newWords = [];
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for ($i = 0; $i < count($splitWords ?? []); $i++) {
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$word = $splitWords[$i];
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if ($word[0] == '"') {
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while (++$i < count($splitWords ?? [])) {
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$subword = $splitWords[$i];
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$word .= ' ' . $subword;
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if (substr($subword ?? '', -1) == '"') {
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break;
}
}
} else {
$word .= '*';
}
$newWords[] = $word;
}
return implode(" ", $newWords);
}
/**
* Get the search query for display in a "You searched for ..." sentence.
*
* @return string
*/
public function getSearchQuery()
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{
return $this->getRequestHandler()->getRequest()->requestVar('Search');
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}
/**
* Set the maximum number of records shown on each page.
*
* @param int $length
*/
public function setPageLength($length)
{
$this->pageLength = $length;
}
/**
* @return int
*/
public function getPageLength()
{
return $this->pageLength;
}
}