BookStack/app/Search/SearchOptions.php

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2021-06-26 23:23:15 +08:00
<?php
namespace BookStack\Search;
use BookStack\Search\Options\ExactSearchOption;
use BookStack\Search\Options\FilterSearchOption;
use BookStack\Search\Options\SearchOption;
use BookStack\Search\Options\TagSearchOption;
use BookStack\Search\Options\TermSearchOption;
use Illuminate\Http\Request;
class SearchOptions
{
public SearchOptionSet $searches;
public SearchOptionSet $exacts;
public SearchOptionSet $tags;
public SearchOptionSet $filters;
public function __construct()
{
$this->searches = new SearchOptionSet();
$this->exacts = new SearchOptionSet();
$this->tags = new SearchOptionSet();
$this->filters = new SearchOptionSet();
}
/**
* Create a new instance from a search string.
*/
public static function fromString(string $search): self
{
$instance = new self();
$instance->addOptionsFromString($search);
return $instance;
}
/**
* Create a new instance from a request.
* Will look for a classic string term and use that
* Otherwise we'll use the details from an advanced search form.
*/
public static function fromRequest(Request $request): self
{
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if (!$request->has('search') && !$request->has('term')) {
return static::fromString('');
}
if ($request->has('term')) {
return static::fromString($request->get('term'));
}
$instance = new SearchOptions();
$inputs = $request->only(['search', 'types', 'filters', 'exact', 'tags', 'extras']);
$parsedStandardTerms = static::parseStandardTermString($inputs['search'] ?? '');
$inputExacts = array_filter($inputs['exact'] ?? []);
$instance->searches = SearchOptionSet::fromValueArray(array_filter($parsedStandardTerms['terms']), TermSearchOption::class);
$instance->exacts = SearchOptionSet::fromValueArray(array_filter($parsedStandardTerms['exacts']), ExactSearchOption::class);
$instance->exacts = $instance->exacts->merge(SearchOptionSet::fromValueArray($inputExacts, ExactSearchOption::class));
$instance->tags = SearchOptionSet::fromValueArray(array_filter($inputs['tags'] ?? []), TagSearchOption::class);
$cleanedFilters = [];
foreach (($inputs['filters'] ?? []) as $filterKey => $filterVal) {
if (empty($filterVal)) {
continue;
}
$cleanedFilterVal = $filterVal === 'true' ? '' : $filterVal;
$cleanedFilters[] = new FilterSearchOption($cleanedFilterVal, $filterKey);
}
if (isset($inputs['types']) && count($inputs['types']) < 4) {
$cleanedFilters[] = new FilterSearchOption(implode('|', $inputs['types']), 'types');
}
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$instance->filters = new SearchOptionSet($cleanedFilters);
// Parse and merge in extras if provided
if (!empty($inputs['extras'])) {
$extras = static::fromString($inputs['extras']);
$instance->searches = $instance->searches->merge($extras->searches);
$instance->exacts = $instance->exacts->merge($extras->exacts);
$instance->tags = $instance->tags->merge($extras->tags);
$instance->filters = $instance->filters->merge($extras->filters);
}
return $instance;
}
/**
* Decode a search string and add its contents to this instance.
*/
protected function addOptionsFromString(string $searchString): void
{
/** @var array<string, SearchOption[]> $terms */
$terms = [
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'exacts' => [],
'tags' => [],
'filters' => [],
];
$patterns = [
'exacts' => '/-?"((?:\\\\.|[^"\\\\])*)"/',
'tags' => '/-?\[(.*?)\]/',
'filters' => '/-?\{(.*?)\}/',
];
$constructors = [
'exacts' => fn(string $value, bool $negated) => new ExactSearchOption($value, $negated),
'tags' => fn(string $value, bool $negated) => new TagSearchOption($value, $negated),
'filters' => fn(string $value, bool $negated) => FilterSearchOption::fromContentString($value, $negated),
];
// Parse special terms
foreach ($patterns as $termType => $pattern) {
$matches = [];
preg_match_all($pattern, $searchString, $matches);
if (count($matches) > 0) {
foreach ($matches[1] as $index => $value) {
$negated = str_starts_with($matches[0][$index], '-');
$terms[$termType][] = $constructors[$termType]($value, $negated);
}
$searchString = preg_replace($pattern, '', $searchString);
}
}
// Unescape exacts and backslash escapes
foreach ($terms['exacts'] as $exact) {
$exact->value = static::decodeEscapes($exact->value);
}
// Parse standard terms
$parsedStandardTerms = static::parseStandardTermString($searchString);
$this->searches = $this->searches
->merge(SearchOptionSet::fromValueArray($parsedStandardTerms['terms'], TermSearchOption::class))
->filterEmpty();
$this->exacts = $this->exacts
->merge(new SearchOptionSet($terms['exacts']))
->merge(SearchOptionSet::fromValueArray($parsedStandardTerms['exacts'], ExactSearchOption::class))
->filterEmpty();
// Add tags & filters
$this->tags = $this->tags->merge(new SearchOptionSet($terms['tags']));
$this->filters = $this->filters->merge(new SearchOptionSet($terms['filters']));
}
/**
* Decode backslash escaping within the input string.
*/
protected static function decodeEscapes(string $input): string
{
$decoded = "";
$escaping = false;
foreach (str_split($input) as $char) {
if ($escaping) {
$decoded .= $char;
$escaping = false;
} else if ($char === '\\') {
$escaping = true;
} else {
$decoded .= $char;
}
}
return $decoded;
}
/**
* Parse a standard search term string into individual search terms and
* convert any required terms to exact matches. This is done since some
* characters will never be in the standard index, since we use them as
* delimiters, and therefore we convert a term to be exact if it
* contains one of those delimiter characters.
*
* @return array{terms: array<string>, exacts: array<string>}
*/
protected static function parseStandardTermString(string $termString): array
{
$terms = explode(' ', $termString);
$indexDelimiters = SearchIndex::$delimiters;
$parsed = [
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'terms' => [],
'exacts' => [],
];
foreach ($terms as $searchTerm) {
if ($searchTerm === '') {
continue;
}
$becomeExact = (strpbrk($searchTerm, $indexDelimiters) !== false);
$parsed[$becomeExact ? 'exacts' : 'terms'][] = $searchTerm;
}
return $parsed;
}
/**
* Set the value of a specific filter in the search options.
*/
public function setFilter(string $filterName, string $filterValue = ''): void
{
$this->filters = $this->filters->merge(
new SearchOptionSet([new FilterSearchOption($filterValue, $filterName)])
);
}
/**
* Encode this instance to a search string.
*/
public function toString(): string
{
$options = [
...$this->searches->all(),
...$this->exacts->all(),
...$this->tags->all(),
...$this->filters->all(),
];
$parts = array_map(fn(SearchOption $o) => $o->toString(), $options);
return implode(' ', $parts);
}
/**
* Get the search options that don't have UI controls provided for.
* Provided back as a key => value array with the keys being expected
* input names for a search form, and values being the option value.
*/
public function getAdditionalOptionsString(): string
{
$options = [];
// Non-[created/updated]-by-me options
$userFilters = ['updated_by', 'created_by', 'owned_by'];
foreach ($this->filters->all() as $filter) {
if (in_array($filter->getKey(), $userFilters, true) && $filter->value !== null && $filter->value !== 'me') {
$options[] = $filter;
}
}
// Negated items
array_push($options, ...$this->exacts->negated());
array_push($options, ...$this->tags->negated());
array_push($options, ...$this->filters->negated());
return implode(' ', array_map(fn(SearchOption $o) => $o->toString(), $options));
}
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}