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1 | <?php |
2 | |
3 | /** |
4 | * SwitchQuery Recommendations Module |
5 | * |
6 | * PHP version 8 |
7 | * |
8 | * Copyright (C) Villanova University 2010. |
9 | * |
10 | * This program is free software; you can redistribute it and/or modify |
11 | * it under the terms of the GNU General Public License version 2, |
12 | * as published by the Free Software Foundation. |
13 | * |
14 | * This program is distributed in the hope that it will be useful, |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
17 | * GNU General Public License for more details. |
18 | * |
19 | * You should have received a copy of the GNU General Public License |
20 | * along with this program; if not, write to the Free Software |
21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
22 | * |
23 | * @category VuFind |
24 | * @package Recommendations |
25 | * @author Demian Katz <demian.katz@villanova.edu> |
26 | * @author Chris Hallberg <challber@villanova.edu> |
27 | * @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License |
28 | * @link https://vufind.org/wiki/development:plugins:recommendation_modules Wiki |
29 | */ |
30 | |
31 | namespace VuFind\Recommend; |
32 | |
33 | use VuFindSearch\Command\GetLuceneHelperCommand; |
34 | use VuFindSearch\Service; |
35 | |
36 | use function in_array; |
37 | use function strlen; |
38 | |
39 | /** |
40 | * SwitchQuery Recommendations Module |
41 | * |
42 | * This class recommends adjusting your search query to yield better results. |
43 | * |
44 | * @category VuFind |
45 | * @package Recommendations |
46 | * @author Demian Katz <demian.katz@villanova.edu> |
47 | * @author Chris Hallberg <challber@villanova.edu> |
48 | * @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License |
49 | * @link https://vufind.org/wiki/development:plugins:recommendation_modules Wiki |
50 | */ |
51 | class SwitchQuery implements RecommendInterface |
52 | { |
53 | /** |
54 | * Search backend identifier that we are working with. |
55 | * |
56 | * @var string |
57 | */ |
58 | protected $backend; |
59 | |
60 | /** |
61 | * Search service. |
62 | * |
63 | * @var Service |
64 | */ |
65 | protected $searchService; |
66 | |
67 | /** |
68 | * Improved query suggestions. |
69 | * |
70 | * @var array |
71 | */ |
72 | protected $suggestions = []; |
73 | |
74 | /** |
75 | * Names of checks that should be skipped. These should correspond |
76 | * with check method names -- e.g. to skip the check found in the |
77 | * checkWildcard() method, you would put 'wildcard' into this array. |
78 | * |
79 | * @var array |
80 | */ |
81 | protected $skipChecks = []; |
82 | |
83 | /** |
84 | * List of 'opt-in' methods (others are 'opt-out' by default). |
85 | * |
86 | * @var array |
87 | */ |
88 | protected $optInMethods = ['fuzzy', 'truncatechar']; |
89 | |
90 | /** |
91 | * Search results object. |
92 | * |
93 | * @var \VuFind\Search\Base\Results |
94 | */ |
95 | protected $results; |
96 | |
97 | /** |
98 | * Constructor |
99 | * |
100 | * @param Service $searchService Search backend plugin manager |
101 | */ |
102 | public function __construct(Service $searchService) |
103 | { |
104 | $this->searchService = $searchService; |
105 | } |
106 | |
107 | /** |
108 | * Store the configuration of the recommendation module. |
109 | * |
110 | * @param string $settings Settings from searches.ini. |
111 | * |
112 | * @return void |
113 | */ |
114 | public function setConfig($settings) |
115 | { |
116 | $params = explode(':', $settings); |
117 | $this->backend = !empty($params[0]) ? $params[0] : 'Solr'; |
118 | $callback = function ($i) { |
119 | return trim(strtolower($i)); |
120 | }; |
121 | // Get a list of "opt out" preferences from the user... |
122 | $this->skipChecks = !empty($params[1]) |
123 | ? array_map($callback, explode(',', $params[1])) : []; |
124 | $optIns = !empty($params[2]) |
125 | ? explode(',', $params[2]) : []; |
126 | $this->skipChecks = array_merge( |
127 | $this->skipChecks, |
128 | array_diff($this->optInMethods, $optIns) |
129 | ); |
130 | } |
131 | |
132 | /** |
133 | * Called before the Search Results object performs its main search |
134 | * (specifically, in response to \VuFind\Search\SearchRunner::EVENT_CONFIGURED). |
135 | * This method is responsible for setting search parameters needed by the |
136 | * recommendation module and for reading any existing search parameters that may |
137 | * be needed. |
138 | * |
139 | * @param \VuFind\Search\Base\Params $params Search parameter object |
140 | * @param \Laminas\Stdlib\Parameters $request Parameter object representing user |
141 | * request. |
142 | * |
143 | * @return void |
144 | */ |
145 | public function init($params, $request) |
146 | { |
147 | } |
148 | |
149 | /** |
150 | * Called after the Search Results object has performed its main search. This |
151 | * may be used to extract necessary information from the Search Results object |
152 | * or to perform completely unrelated processing. |
153 | * |
154 | * @param \VuFind\Search\Base\Results $results Search results object |
155 | * |
156 | * @return void |
157 | */ |
158 | public function process($results) |
159 | { |
160 | $this->results = $results; |
161 | |
162 | // We can't currently deal with advanced searches: |
163 | if ($this->results->getParams()->getSearchType() == 'advanced') { |
164 | return; |
165 | } |
166 | |
167 | // Get the query to manipulate: |
168 | $query = $this->results->getParams()->getDisplayQuery(); |
169 | |
170 | // If the query is of a type that should be skipped, go no further: |
171 | if ($this->queryShouldBeSkipped($query)) { |
172 | return; |
173 | } |
174 | |
175 | // Perform all checks (based on naming convention): |
176 | $methods = get_class_methods($this); |
177 | foreach ($methods as $method) { |
178 | if (str_starts_with($method, 'check')) { |
179 | $currentCheck = strtolower(substr($method, 5)); |
180 | if (!in_array($currentCheck, $this->skipChecks)) { |
181 | if ($result = $this->$method($query)) { |
182 | $this->suggestions['switchquery_' . $currentCheck] = $result; |
183 | } |
184 | } |
185 | } |
186 | } |
187 | } |
188 | |
189 | /** |
190 | * Should the query be ignored when making recommendations? |
191 | * |
192 | * @param string $query Query to check |
193 | * |
194 | * @return bool |
195 | */ |
196 | protected function queryShouldBeSkipped($query) |
197 | { |
198 | // If this is an ID list query, it was probably generated by New Items, |
199 | // Course Reserves, etc., and thus should not be further manipulated by |
200 | // the user. |
201 | return str_starts_with($query, 'id:'); |
202 | } |
203 | |
204 | /** |
205 | * Will a fuzzy search help? |
206 | * |
207 | * @param string $query Query to check |
208 | * |
209 | * @return string|bool |
210 | */ |
211 | protected function checkFuzzy($query) |
212 | { |
213 | // Don't stack tildes: |
214 | if (str_contains($query, '~')) { |
215 | return false; |
216 | } |
217 | $query = trim($query, ' ?*'); |
218 | // Fuzzy search only works for single keywords, not phrases: |
219 | if (str_ends_with($query, '"')) { |
220 | return false; |
221 | } |
222 | return str_ends_with($query, '~') ? false : $query . '~'; |
223 | } |
224 | |
225 | /** |
226 | * Does the query contain lowercase boolean operators that should be uppercased? |
227 | * |
228 | * @param string $query Query to check |
229 | * |
230 | * @return string|bool |
231 | */ |
232 | protected function checkLowercaseBools($query) |
233 | { |
234 | // This test only applies if booleans are case-sensitive and there is a |
235 | // capitalization method available: |
236 | $lh = $this->getLuceneHelper(); |
237 | if (!$lh || !$lh->hasCaseSensitiveBooleans()) { |
238 | return false; |
239 | } |
240 | |
241 | // Try to capitalize booleans, return new query if a change is found: |
242 | $newQuery = $lh->capitalizeBooleans($query); |
243 | return ($query == $newQuery) ? false : $newQuery; |
244 | } |
245 | |
246 | /** |
247 | * Does the query contain terms that are being treated as boolean operators, |
248 | * perhaps unintentionally? |
249 | * |
250 | * @param string $query Query to check |
251 | * |
252 | * @return string|bool |
253 | */ |
254 | protected function checkUnwantedBools($query) |
255 | { |
256 | $query = trim($query); |
257 | $lh = $this->getLuceneHelper(); |
258 | if (!$lh || !$lh->containsBooleans($query)) { |
259 | return false; |
260 | } |
261 | return '"' . addcslashes($query, '"') . '"'; |
262 | } |
263 | |
264 | /** |
265 | * Would removing quotes help? |
266 | * |
267 | * @param string $query Query to check |
268 | * |
269 | * @return string|bool |
270 | */ |
271 | protected function checkUnwantedQuotes($query) |
272 | { |
273 | // Remove escaped quotes as they are of no consequence: |
274 | $query = str_replace('\"', ' ', $query); |
275 | return (!str_contains($query, '"')) |
276 | ? false : trim(str_replace('"', ' ', $query)); |
277 | } |
278 | |
279 | /** |
280 | * Will adding a wildcard help? |
281 | * |
282 | * @param string $query Query to check |
283 | * |
284 | * @return string|bool |
285 | */ |
286 | protected function checkWildcard($query) |
287 | { |
288 | $query = trim($query, ' ?~'); |
289 | // Don't pile wildcards on phrases: |
290 | if (str_ends_with($query, '"')) { |
291 | return false; |
292 | } |
293 | return !str_ends_with($query, '*') ? $query . '*' : false; |
294 | } |
295 | |
296 | /** |
297 | * Broaden search by truncating one character (e.g. call number) |
298 | * |
299 | * @param string $query Query to transform |
300 | * |
301 | * @return string|bool |
302 | */ |
303 | protected function checkTruncatechar($query) |
304 | { |
305 | // Don't truncate phrases: |
306 | if (str_ends_with($query, '"')) { |
307 | return false; |
308 | } |
309 | $query = trim($query); |
310 | return (strlen($query) > 1) ? substr($query, 0, -1) : false; |
311 | } |
312 | |
313 | /** |
314 | * Extract a Lucene syntax helper from the search backend, if possible. |
315 | * |
316 | * @return bool|\VuFindSearch\Backend\Solr\LuceneSyntaxHelper |
317 | */ |
318 | protected function getLuceneHelper() |
319 | { |
320 | $command = new GetLuceneHelperCommand($this->backend); |
321 | return $this->searchService->invoke($command)->getResult(); |
322 | } |
323 | |
324 | /** |
325 | * Get results stored in the object. |
326 | * |
327 | * @return \VuFind\Search\Base\Results |
328 | */ |
329 | public function getResults() |
330 | { |
331 | return $this->results; |
332 | } |
333 | |
334 | /** |
335 | * Get an array of suggestion messages. |
336 | * |
337 | * @return array |
338 | */ |
339 | public function getSuggestions() |
340 | { |
341 | return $this->suggestions; |
342 | } |
343 | } |