lib.php 33.1 KB
Newer Older
Martyn Smith's avatar
Martyn Smith committed
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
<?php
/**
 * This program is part of Mahara
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 *
 * @package    mahara
 * @subpackage search-internal
 * @author     Martyn Smith <martyn@catalyst.net.nz>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL
 * @copyright  (C) 2006,2007 Catalyst IT Ltd http://catalyst.net.nz
 *
 */

defined('INTERNAL') || die();

/**
30
 * The internal search plugin which searches against the
Martyn Smith's avatar
Martyn Smith committed
31
32
33
34
35
36
37
 * Mahara database.
 */
class PluginSearchInternal extends PluginSearch {

    /**
     * Implement user searching with SQL
     *
38
39
     * NOTE: user with ID zero should never be returned
     *
Martyn Smith's avatar
Martyn Smith committed
40
41
42
43
44
45
46
47
     * @param string  The query string
     * @param integer How many results to return
     * @param integer What result to start at (0 == first result)
     * @return array  A data structure containing results looking like ...
     *         $results = array(
     *               count   => integer, // total number of results
     *               limit   => integer, // how many results are returned
     *               offset  => integer, // starting from which result
48
     *               data    => array(   // the result records
Martyn Smith's avatar
Martyn Smith committed
49
     *                   array(
50
51
52
53
54
55
56
     *                       id            => integer,
     *                       username      => string,
     *                       institution   => string,
     *                       firstname     => string,
     *                       lastname      => string,
     *                       preferredname => string,
     *                       email         => string,
Martyn Smith's avatar
Martyn Smith committed
57
58
     *                   ),
     *                   array(
59
60
61
62
63
64
65
     *                       id            => integer,
     *                       username      => string,
     *                       institution   => string,
     *                       firstname     => string,
     *                       lastname      => string,
     *                       preferredname => string,
     *                       email         => string,
Martyn Smith's avatar
Martyn Smith committed
66
67
68
69
70
     *                   ),
     *                   array(...),
     *               ),
     *           );
     */
71
    public static function search_user($query_string, $limit, $offset = 0, $data=array()) {
72
73
        safe_require('artefact', 'internal');
        $publicfields = array_keys(ArtefactTypeProfile::get_public_fields());
74
75
76
        if (empty($publicfields)) {
            $publicfields = array('preferredname');
        }
77
        if (is_postgres()) {
78
            return self::search_user_pg($query_string, $limit, $offset, $data, $publicfields);
79
80
        } 
        else if (is_mysql()) {
81
            return self::search_user_my($query_string, $limit, $offset, $publicfields);
82
83
        }
        else {
84
85
86
87
            throw new SQLException('search_user() is not implemented for your database engine (' . get_config('dbtype') . ')');
        }
    }

88
    public static function search_user_pg($query_string, $limit, $offset, $data, $publicfields) {
89
        $fieldlist = "('" . join("','", $publicfields) . "')";
90
91
92
        $group = isset($data['group'])
            ? 'INNER JOIN {group_member} g ON g.group = ' . (int)$data['group'] . ' AND g.member = u.id'
            : '';
Martyn Smith's avatar
Martyn Smith committed
93

94
95
96
97
        $count = get_field_sql('
            SELECT 
                COUNT(DISTINCT u.id)
            FROM
98
99
                {usr} u
                LEFT JOIN {artefact} a ON u.id=a.owner
100
                ' . $group . '
101
102
103
            WHERE
                u.id <> 0 AND u.active = 1
                AND ((
104
105
106
107
                        u.preferredname ILIKE \'%\' || ? || \'%\'
                    )
                    OR (
                        (u.preferredname IS NULL OR u.preferredname = \'\')
108
109
110
111
112
113
114
115
116
117
118
                        AND (
                            u.firstname ILIKE \'%\' || ? || \'%\'
                            OR u.lastname ILIKE \'%\' || ? || \'%\'
                        )
                    )
                    OR (
                        a.artefacttype IN ' . $fieldlist . '
                        AND ( a.title ILIKE \'%\' || ? || \'%\')
                    )
                )
            ',
119
            array($query_string, $query_string, $query_string, $query_string)
120
121
122
123
124
125
        );

        if ($count > 0) {
            $data = get_records_sql_array('
                SELECT DISTINCT ON (u.firstname, u.lastname, u.id)
                    u.id, u.username, u.institution, u.firstname, u.lastname, u.preferredname, u.email, u.staff
126
127
                FROM {artefact} a
                    INNER JOIN {usr} u ON u.id = a.owner
128
                    ' . $group . '
129
                WHERE
Martyn Smith's avatar
Martyn Smith committed
130
                    u.id <> 0 AND u.active = 1
Martyn Smith's avatar
Martyn Smith committed
131
                    AND ((
132
133
134
135
                            u.preferredname ILIKE \'%\' || ? || \'%\'
                        )
                        OR (
                            (u.preferredname IS NULL OR u.preferredname = \'\')
Martyn Smith's avatar
Martyn Smith committed
136
137
138
139
140
141
142
143
144
145
                            AND (
                                u.firstname ILIKE \'%\' || ? || \'%\'
                                OR u.lastname ILIKE \'%\' || ? || \'%\'
                            )
                        )
                        OR (
                            a.artefacttype IN ' . $fieldlist . '
                            AND ( a.title ILIKE \'%\' || ? || \'%\')
                        )
                    )
146
                ORDER BY u.firstname, u.lastname, u.id',
147
            array($query_string, $query_string, $query_string, $query_string),
148
149
            $offset,
            $limit);
150

151
152
153
            if ($data) {
                foreach ($data as &$item) {
                    $item = (array)$item;
154
                }
155
            }
Martyn Smith's avatar
Martyn Smith committed
156
157
        }
        else {
158
            $data = false;
Nigel McNie's avatar
Nigel McNie committed
159
160
161
162
163
164
165
166
167
        }

        return array(
            'count'   => $count,
            'limit'   => $limit,
            'offset'  => $offset,
            'data'    => $data,
        );
    }
168

169
    public static function search_user_my($query_string, $limit, $offset, $data, $publicfields) {
170
171
        $fieldlist = "('" . join("','", $publicfields) . "')";

172
173
174
175
176
        $group = isset($data['group'])
            ? 'INNER JOIN {group_member} g ON g.group = ' . (int)$data['group'] . ' AND g.member = u.id'
            : '';


177
178
        $count = get_field_sql('
            SELECT 
179
                COUNT(DISTINCT owner)
180
            FROM
181
182
                {usr} u
                LEFT JOIN {artefact} a ON u.id=a.owner
183
                ' . $group . '
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
            WHERE
                u.id <> 0 AND u.active = 1
                AND ((
                        u.preferredname IS NULL
                        AND (
                            u.firstname LIKE \'%\' || ? || \'%\'
                            OR u.lastname LIKE \'%\' || ? || \'%\'
                        )
                    )
                    OR (
                        a.artefacttype IN ' . $fieldlist . '
                        AND ( a.title LIKE \'%\' || ? || \'%\')
                    )
                )
            ',
            array($query_string, $query_string, $query_string)
        );

        if ($count > 0) {
203
204
205
206
207
            // @todo This is quite possibly not correct. See the postgres 
            // query. It should be DISTINCT ON the fields as specified by the 
            // postgres query. There is a workaround by using SELECT * followed 
            // by GROUP BY 1, 2, 3, but it's not really valid SQL. The other 
            // way is to rewrite the query using a self join on the usr table.
208
            $data = get_records_sql_array('
209
                SELECT DISTINCT
210
                    u.id, u.username, u.institution, u.firstname, u.lastname, u.preferredname, u.email, u.staff
211
212
                FROM {artefact} a
                    INNER JOIN {usr} u ON u.id = a.owner
213
                    ' . $group . '
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
                WHERE
                    u.id <> 0 AND u.active = 1
                    AND ((
                            u.preferredname IS NULL
                            AND (
                                u.firstname LIKE \'%\' || ? || \'%\'
                                OR u.lastname LIKE \'%\' || ? || \'%\'
                            )
                        )
                        OR (
                            a.artefacttype IN ' . $fieldlist . '
                            AND ( a.title LIKE \'%\' || ? || \'%\')
                        )
                    )
                ORDER BY u.firstname, u.lastname, u.id',
            array($query_string, $query_string, $query_string),
            $offset,
            $limit);

            if ($data) {
                foreach ($data as &$item) {
                    $item = (array)$item;
                }
            }
        }
        else {
            $data = false;
        }

        return array(
            'count'   => $count,
            'limit'   => $limit,
            'offset'  => $offset,
            'data'    => $data,
        );
    }
Nigel McNie's avatar
Nigel McNie committed
250
    
251

252
253
    public static function admin_search_user($queries, $constratints, $offset, $limit, 
                                             $sortfield, $sortdir) {
254
        if (is_postgres()) {
255
256
            return self::admin_search_user_pg($queries, $constratints, $offset, $limit, 
                                              $sortfield . ' ' . strtoupper($sortdir));
257
258
259
260
261
262
263
264
265
266
        } 
        //else if (is_mysql()) {
        //    return self::admin_search_user_my($query_string, $limit, $offset);
        //}
        else {
            throw new SQLException('admin_search_user() is not implemented for your database engine (' . get_config('dbtype') . ')');
        }
    }


267
    public static function admin_search_user_pg($queries, $constraints, $offset, $limit, $sort) {
268
        $where = 'WHERE u.id <> 0 AND u.deleted = 0';
269
270
        $values = array();

271
        // Only handle OR/AND expressions at the top level.  Eventually we may need subexpressions.
272

273
274
275
        $matchtypes = array('starts' => ' ILIKE ? || \'%\'',
                            'equals' => ' = ? ',
                            'contains' => ' ILIKE \'%\' || ? || \'%\'');
276

Richard Mansfield's avatar
Richard Mansfield committed
277
        if (!empty($queries)) {
278
279
            $where .= ' AND ( ';
            $str = array();
Richard Mansfield's avatar
Richard Mansfield committed
280
            foreach ($queries as $f) {
281
282
283
284
285
286
                $str[] = 'u.' . $f['field'] . $matchtypes[$f['type']];
                $values[] = $f['string'];
            }
            $where .= join(' OR ', $str) . ') ';
        } 

Richard Mansfield's avatar
Richard Mansfield committed
287
288
        if (!empty($constraints)) {
            foreach ($constraints as $f) {
289
290
291
                $where .= ' AND u.' . $f['field'] . $matchtypes[$f['type']];
                $values[] = $f['string'];
            }
292
293
        }

294
295
296
297
298
299
        $count = get_field_sql('SELECT COUNT(*) FROM {usr} u ' . $where, $values);

        if ($count > 0) {
            $data = get_records_sql_array('
                SELECT 
                    u.id, u.firstname, u.lastname, u.username, u.institution, u.email, u.staff,
300
                    u.active, NOT u.suspendedcusr IS NULL as suspended
301
302
                FROM
                    {usr} u ' . $where . '
303
                ORDER BY ' . $sort,
304
                $values,
Richard Mansfield's avatar
Richard Mansfield committed
305
306
                $offset,
                $limit);
307
308
309
310
311
312
313
314
315
316
317
318
319

            if ($data) {
                foreach ($data as &$item) {
                    $item = (array)$item;
                }
            }
        }
        else {
            $data = false;
        }

        return array(
            'count'   => $count,
Richard Mansfield's avatar
Richard Mansfield committed
320
321
            'limit'   => $limit,
            'offset'  => $offset,
322
323
324
325
            'data'    => $data,
        );
    }

326
327
328
329
330
331
332
333
334
335
336
337
338
    /**
     * Implement group searching with SQL
     *
     * @param string  The query string
     * @param integer How many results to return
     * @param integer What result to start at (0 == first result)
     * @return array  A data structure containing results looking like ...
     *         $results = array(
     *               count   => integer, // total number of results
     *               limit   => integer, // how many results are returned
     *               offset  => integer, // starting from which result
     *               data    => array(   // the result records
     *                   array(
Nigel McNie's avatar
Nigel McNie committed
339
     *                       id            => integer,
340
341
342
343
344
345
     *                       name          => string,
     *                       description   => string,
     *                       jointype      => string,
     *                       owner         => string,
     *                       ctime         => string,
     *                       mtime         => string,
Nigel McNie's avatar
Nigel McNie committed
346
347
348
     *                   ),
     *                   array(
     *                       id            => integer,
349
350
351
352
353
354
     *                       name          => string,
     *                       description   => string,
     *                       jointype      => string,
     *                       owner         => string,
     *                       ctime         => string,
     *                       mtime         => string,
Nigel McNie's avatar
Nigel McNie committed
355
356
357
358
359
     *                   ),
     *                   array(...),
     *               ),
     *           );
     */
360
    public static function search_group($query_string, $limit, $offset=0, $all=false) {
361
        if (is_postgres()) {
362
            return self::search_group_pg($query_string, $limit, $offset, $all);
363
364
        } 
        else if (is_mysql()) {
365
            return self::search_group_my($query_string, $limit, $offset, $all);
366
367
        } 
        else {
368
            throw new SQLException('search_group() is not implemented for your database engine (' . get_config('dbtype') . ')');
Martyn Smith's avatar
Martyn Smith committed
369
        }
370
371
    }

372
    public static function search_group_pg($query_string, $limit, $offset, $all) {
373
374
375
376
377
        global $USER;
        $sql = "
            SELECT
                id, name, description, jointype, owner, ctime, mtime
            FROM
378
                {group}
379
380
381
382
383
384
            WHERE (
                name ILIKE '%' || ? || '%' 
                OR description ILIKE '%' || ? || '%' 
            )";
        $values = array($query_string, $query_string);
        if (!$all) {
385
            $sql .=  'AND ( 
386
                owner = ? OR id IN (
387
                    SELECT "group" FROM {group_member} WHERE member = ?
388
                )
389
            )';
390
391
392
393
394
395
396
397
398
            $values[] = $USER->get('id');
            $values[] = $USER->get('id');
        }
        $data = get_records_sql_array($sql, $values, $offset, $limit);

        $sql = "
            SELECT
                COUNT(*)
            FROM
399
                {group} u
400
401
402
403
404
            WHERE (
                name ILIKE '%' || ? || '%' 
                OR description ILIKE '%' || ? || '%' 
            )";
        if (!$all) {
405
            $sql .= 'AND ( 
406
                    owner = ? OR id IN (
407
                        SELECT "group" FROM {group_member} WHERE member = ?
408
409
                    )
                )
410
            ';
411
412
        }
        $count = get_field_sql($sql, $values);
413
414
415
416
417
418
419
420
421

        return array(
            'count'   => $count,
            'limit'   => $limit,
            'offset'  => $offset,
            'data'    => $data,
        );
    }

422
    public static function search_group_my($query_string, $limit, $offset, $all) {
423
424
425
426
427
        global $USER;
        $sql = "
            SELECT
                id, name, description, jointype, owner, ctime, mtime
            FROM
428
                {group}
429
430
431
432
433
434
435
436
            WHERE (
                name LIKE '%' || ? || '%' 
                OR description LIKE '%' || ? || '%' 
            )";
        $values = array($query_string, $query_string);
        if (!$all) {
            $sql .=  "AND ( 
                owner = ? OR id IN (
437
                    SELECT group FROM {group_member} WHERE member = ?
438
439
440
441
442
443
444
445
446
447
448
                )
            )";
            $values[] = $USER->get('id');
            $values[] = $USER->get('id');
        }
        $data = get_records_sql_array($sql, $values, $offset, $limit);

        $sql = "
            SELECT
                COUNT(*)
            FROM
449
                {group} u
450
451
452
453
454
455
456
            WHERE (
                name LIKE '%' || ? || '%' 
                OR description LIKE '%' || ? || '%' 
            )";
        if (!$all) {
            $sql .= "AND ( 
                    owner = ? OR id IN (
457
                        SELECT group FROM {group_member} WHERE member = ?
458
459
460
461
462
                    )
                )
            ";
        }
        $count = get_field_sql($sql, $values);
Martyn Smith's avatar
Martyn Smith committed
463
464
465
466
467

        return array(
            'count'   => $count,
            'limit'   => $limit,
            'offset'  => $offset,
468
            'data'    => $data,
Martyn Smith's avatar
Martyn Smith committed
469
470
        );
    }
Martyn Smith's avatar
Martyn Smith committed
471
472
473
474
475
476
477
478
479
480
481

    /**
     * Given a query string and limits, return an array of matching objects
     * owned by the current user.  Possible return types are ...
     *   - artefact
     *   - view
     *
     * Implementations of this search should search across tags for artefacts
     * and views at a minimum. Ideally the search would also index
     * title/description and other metadata for these objects.
     *
482
483
484
     * NOTE: This implementation of internal search only does artefacts, and
     * badly at that. See the bug tracker for more information.
     *
Martyn Smith's avatar
Martyn Smith committed
485
486
487
488
489
490
     * @param string  The query string
     * @param integer How many results to return
     * @param integer What result to start at (0 == first result)
     * @param string  Type to search for (either 'all' or one of the types above).
     * 
     */
491
492
    public static function self_search($querystring, $limit, $offset, $type = 'all') {
        global $USER;
493
494
495
496
        if (trim($querystring) == '') {
            return false;
        }

497
498
499
500
501
502
503
        // Tokenise the search
        $querydata = self::search_parse_query($querystring);

        $sql = "
            SELECT
                id, artefacttype, title, description
            FROM
504
                {artefact} a
505
506
507
508
509
510
511
            WHERE
                owner = ?
            AND ($querydata[0])";
        $count_sql = "
            SELECT
                COUNT(*)
            FROM
512
                {artefact} a
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
            WHERE
                owner = ?
            AND ($querydata[0])";

        array_unshift($querydata[1], $USER->get('id'));
        $results = array(
            'data'   => get_records_sql_array($sql, $querydata[1], $offset, $limit),
            'offset' => $offset,
            'limit'  => $limit,
            'count'  => get_field_sql($count_sql, $querydata[1])
        );

        foreach ($results['data'] as &$result) {
            $newresult = array();
            foreach ($result as $key => &$value) {
                if ($key == 'id' || $key == 'artefacttype' || $key == 'title' || $key == 'description') {
                    $newresult[$key] = $value;
                }
            }
            $newresult['type'] = 'artefact';
            $artefactplugin = get_field('artefact_installed_type', 'plugin', 'name', $newresult['artefacttype']);
            if ($artefactplugin == 'internal') {
                $newresult['summary'] = $newresult['title'];
                $newresult['title'] = get_string($newresult['artefacttype'], 'artefact.' . $artefactplugin);
            }
            else {
                $newresult['summary'] = $newresult['description'];
            }
            $result = $newresult;
        }
        
        self::self_search_make_links($results);

        return $results;
    }


    /**
     * Parses a query string into SQL fragments for searching. Supports 
     * phrases, AND/OR etc.
     *
     * Lifted from drupal 5.1, (C) 2007 Drupal
     *
     * This function comes from Drupal's search module, with some small changes.
     */
    private static function search_parse_query($text) {
        $keys = array('positive' => array(), 'negative' => array());

        // Tokenize query string
        preg_match_all('/ (-?)("[^"]+"|[^" ]+)/i', ' '. $text, $matches, PREG_SET_ORDER);

        if (count($matches) < 1) {
          return NULL;
        }

        // Classify tokens
        $or = FALSE;
        foreach ($matches as $match) {
          $phrase = FALSE;
          // Strip off phrase quotes
          if ($match[2]{0} == '"') {
            $match[2] = substr($match[2], 1, -1);
            $phrase = TRUE;
          }
          // Simplify keyword according to indexing rules and external preprocessors
          $words = self::search_simplify($match[2]);
          // Re-explode in case simplification added more words, except when matching a phrase
          $words = $phrase ? array($words) : preg_split('/ /', $words, -1, PREG_SPLIT_NO_EMPTY);
          // Negative matches
          if ($match[1] == '-') {
            $keys['negative'] = array_merge($keys['negative'], $words);
          }
          // OR operator: instead of a single keyword, we store an array of all
          // OR'd keywords.
          elseif ($match[2] == 'OR' && count($keys['positive'])) {
            $last = array_pop($keys['positive']);
            // Starting a new OR?
            if (!is_array($last)) {
              $last = array($last);
            }
            $keys['positive'][] = $last;
            $or = TRUE;
            continue;
          }
          // Plain keyword
          else {
            if ($or) {
              // Add to last element (which is an array)
              $keys['positive'][count($keys['positive']) - 1] = array_merge($keys['positive'][count($keys['positive']) - 1], $words);
            }
            else {
              $keys['positive'] = array_merge($keys['positive'], $words);
            }
          }
          $or = FALSE;
        }

        // Convert keywords into SQL statements.
        $query = array();
        //$query2 = array();
        $arguments = array();
        $arguments2 = array();
        //$matches = 0; 
        // Positive matches
        foreach ($keys['positive'] as $key) {
          // Group of ORed terms
          if (is_array($key) && count($key)) {
            $queryor = array();
            $any = FALSE;
            foreach ($key as $or) {
              list($q, $count) = self::_search_parse_query($or, $arguments2);
              $any |= $count;
              if ($q) {
                $queryor[] = $q;
                $arguments[] = $or;
                $arguments[] = $or;
              }
            }

            if (count($queryor)) {
              $query[] = '('. implode(' OR ', $queryor) .')';
              // A group of OR keywords only needs to match once
              //$matches += ($any > 0);
            }
          }
          // Single ANDed term
          else {
            list($q, $count) = self::_search_parse_query($key, $arguments2);
            if ($q) {
              $query[] = $q;
              $arguments[] = $key;
              $arguments[] = $key;
              // Each AND keyword needs to match at least once
              //$matches += $count;
            }
          }
        }
        // Negative matches
        foreach ($keys['negative'] as $key) {
          list($q) = self::_search_parse_query($key, $arguments2, TRUE);
          if ($q) {
            $query[] = $q;
            $arguments[] = $key;
            $arguments[] = $key;
          }
        }
        $query = implode(' AND ', $query);

        // Build word-index conditions for the first pass
        //$query2 = substr(str_repeat("i.word = '%s' OR ", count($arguments2)), 0, -4);

        return array($query, $arguments, /*$query2, $arguments2, $matches*/);
Martyn Smith's avatar
Martyn Smith committed
665
    }
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802

    /**
     * Helper function for search_parse_query();
     */
    private static function _search_parse_query(&$word, &$scores, $not = FALSE) {
      $count = 0;
      // Determine the scorewords of this word/phrase
      if (!$not) {
        $split = explode(' ', $word);
        foreach ($split as $s) {
          $num = is_numeric($s);
          if ($num || strlen($s) >= /*variable_get('minimum_word_size', 3)*/3) {
            $s = $num ? ((int)ltrim($s, '-0')) : $s;
            if (!isset($scores[$s])) {
              $scores[$s] = $s;
              $count++;
            }
          }
        }
      }
      // Return matching snippet and number of added words
      return array("a.title ". ($not ? 'NOT ' : '') ."LIKE '%' || ? || '%'" . ($not ? ' AND ' : ' OR ') . 'a.description ' . ($not ? 'NOT ' : '') . "LIKE '%' || ? || '%'", $count);
    }

    /**
     * Simplifies a string according to indexing rules.
     */
    private static function search_simplify($text) {
      // Decode entities to UTF-8
      $text = self::decode_entities($text);
    
      // Lowercase
      $text = strtolower($text);
    
      // Call an external processor for word handling.
      //search_preprocess($text);
    
      // Simple CJK handling
      //if (variable_get('overlap_cjk', TRUE)) {
      //  $text = preg_replace_callback('/['. PREG_CLASS_CJK .']+/u', 'search_expand_cjk', $text);
      //}
    
      // To improve searching for numerical data such as dates, IP addresses
      // or version numbers, we consider a group of numerical characters
      // separated only by punctuation characters to be one piece.
      // This also means that searching for e.g. '20/03/1984' also returns
      // results with '20-03-1984' in them.
      // Readable regexp: ([number]+)[punctuation]+(?=[number])
      $text = preg_replace('/(['. PREG_CLASS_NUMBERS .']+)['. PREG_CLASS_PUNCTUATION .']+(?=['. PREG_CLASS_NUMBERS .'])/u', '\1', $text);
    
      // The dot, underscore and dash are simply removed. This allows meaningful
      // search behaviour with acronyms and URLs.
      $text = preg_replace('/[._-]+/', '', $text);
    
      // With the exception of the rules above, we consider all punctuation,
      // marks, spacers, etc, to be a word boundary.
      $text = preg_replace('/['. PREG_CLASS_SEARCH_EXCLUDE . ']+/u', ' ', $text);
    
      return $text;
    }

    /**
     * Decode all HTML entities (including numerical ones) to regular UTF-8 bytes.
     * Double-escaped entities will only be decoded once ("&amp;lt;" becomes "&lt;", not "<").
     *
     * @param $text
     *   The text to decode entities in.
     * @param $exclude 
     *   An array of characters which should not be decoded. For example,
     *   array('<', '&', '"'). This affects both named and numerical entities.
     */
    function decode_entities($text, $exclude = array()) {
      static $table;
      // We store named entities in a table for quick processing.
      if (!isset($table)) { 
        // Get all named HTML entities. 
        $table = array_flip(get_html_translation_table(HTML_ENTITIES));
        // PHP gives us ISO-8859-1 data, we need UTF-8.
        $table = array_map('utf8_encode', $table);
        // Add apostrophe (XML)
        $table['&apos;'] = "'";
      }
      $newtable = array_diff($table, $exclude);

      // Use a regexp to select all entities in one pass, to avoid decoding double-escaped entities twice.
      return preg_replace('/&(#x?)?([A-Za-z0-9]+);/e', '_decode_entities("$1", "$2", "$0", $newtable, $exclude)', $text);
    }

    /**
     * Helper function for decode_entities
     */
    function _decode_entities($prefix, $codepoint, $original, &$table, &$exclude) {
      // Named entity
      if (!$prefix) {
        if (isset($table[$original])) {
          return $table[$original];
        }
        else {
          return $original;
        } 
      }   
      // Hexadecimal numerical entity
      if ($prefix == '#x') {
        $codepoint = base_convert($codepoint, 16, 10);
      } 
      // Decimal numerical entity (strip leading zeros to avoid PHP octal notation)
      else {
        $codepoint = preg_replace('/^0+/', '', $codepoint);
      }
      // Encode codepoint as UTF-8 bytes
      if ($codepoint < 0x80) {
        $str = chr($codepoint);
      }
      else if ($codepoint < 0x800) {
        $str = chr(0xC0 | ($codepoint >> 6))
             . chr(0x80 | ($codepoint & 0x3F));
      }
      else if ($codepoint < 0x10000) {
        $str = chr(0xE0 | ( $codepoint >> 12))
             . chr(0x80 | (($codepoint >> 6) & 0x3F))
             . chr(0x80 | ( $codepoint       & 0x3F));
      }
      else if ($codepoint < 0x200000) {
        $str = chr(0xF0 | ( $codepoint >> 18))
             . chr(0x80 | (($codepoint >> 12) & 0x3F))
             . chr(0x80 | (($codepoint >> 6)  & 0x3F))
             . chr(0x80 | ( $codepoint        & 0x3F));
      }
      // Check for excluded characters
      if (in_array($str, $exclude)) {
        return $original;
      }
      else { 
        return $str;
      }
    }

Martyn Smith's avatar
Martyn Smith committed
803
804
}

805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
/**
 * Matches Unicode character classes to exclude from the search index.
 *
 * See: http://www.unicode.org/Public/UNIDATA/UCD.html#General_Category_Values
 *
 * The index only contains the following character classes:
 * Lu     Letter, Uppercase
 * Ll     Letter, Lowercase
 * Lt     Letter, Titlecase
 * Lo     Letter, Other
 * Nd     Number, Decimal Digit
 * No     Number, Other
 */
define('PREG_CLASS_SEARCH_EXCLUDE',
'\x{0}-\x{2f}\x{3a}-\x{40}\x{5b}-\x{60}\x{7b}-\x{bf}\x{d7}\x{f7}\x{2b0}-'.
'\x{385}\x{387}\x{3f6}\x{482}-\x{489}\x{559}-\x{55f}\x{589}-\x{5c7}\x{5f3}-'.
'\x{61f}\x{640}\x{64b}-\x{65e}\x{66a}-\x{66d}\x{670}\x{6d4}\x{6d6}-\x{6ed}'.
'\x{6fd}\x{6fe}\x{700}-\x{70f}\x{711}\x{730}-\x{74a}\x{7a6}-\x{7b0}\x{901}-'.
'\x{903}\x{93c}\x{93e}-\x{94d}\x{951}-\x{954}\x{962}-\x{965}\x{970}\x{981}-'.
'\x{983}\x{9bc}\x{9be}-\x{9cd}\x{9d7}\x{9e2}\x{9e3}\x{9f2}-\x{a03}\x{a3c}-'.
'\x{a4d}\x{a70}\x{a71}\x{a81}-\x{a83}\x{abc}\x{abe}-\x{acd}\x{ae2}\x{ae3}'.
'\x{af1}-\x{b03}\x{b3c}\x{b3e}-\x{b57}\x{b70}\x{b82}\x{bbe}-\x{bd7}\x{bf0}-'.
'\x{c03}\x{c3e}-\x{c56}\x{c82}\x{c83}\x{cbc}\x{cbe}-\x{cd6}\x{d02}\x{d03}'.
'\x{d3e}-\x{d57}\x{d82}\x{d83}\x{dca}-\x{df4}\x{e31}\x{e34}-\x{e3f}\x{e46}-'.
'\x{e4f}\x{e5a}\x{e5b}\x{eb1}\x{eb4}-\x{ebc}\x{ec6}-\x{ecd}\x{f01}-\x{f1f}'.
'\x{f2a}-\x{f3f}\x{f71}-\x{f87}\x{f90}-\x{fd1}\x{102c}-\x{1039}\x{104a}-'.
'\x{104f}\x{1056}-\x{1059}\x{10fb}\x{10fc}\x{135f}-\x{137c}\x{1390}-\x{1399}'.
'\x{166d}\x{166e}\x{1680}\x{169b}\x{169c}\x{16eb}-\x{16f0}\x{1712}-\x{1714}'.
'\x{1732}-\x{1736}\x{1752}\x{1753}\x{1772}\x{1773}\x{17b4}-\x{17db}\x{17dd}'.
'\x{17f0}-\x{180e}\x{1843}\x{18a9}\x{1920}-\x{1945}\x{19b0}-\x{19c0}\x{19c8}'.
'\x{19c9}\x{19de}-\x{19ff}\x{1a17}-\x{1a1f}\x{1d2c}-\x{1d61}\x{1d78}\x{1d9b}-'.
'\x{1dc3}\x{1fbd}\x{1fbf}-\x{1fc1}\x{1fcd}-\x{1fcf}\x{1fdd}-\x{1fdf}\x{1fed}-'.
'\x{1fef}\x{1ffd}-\x{2070}\x{2074}-\x{207e}\x{2080}-\x{2101}\x{2103}-\x{2106}'.
'\x{2108}\x{2109}\x{2114}\x{2116}-\x{2118}\x{211e}-\x{2123}\x{2125}\x{2127}'.
'\x{2129}\x{212e}\x{2132}\x{213a}\x{213b}\x{2140}-\x{2144}\x{214a}-\x{2b13}'.
'\x{2ce5}-\x{2cff}\x{2d6f}\x{2e00}-\x{3005}\x{3007}-\x{303b}\x{303d}-\x{303f}'.
'\x{3099}-\x{309e}\x{30a0}\x{30fb}-\x{30fe}\x{3190}-\x{319f}\x{31c0}-\x{31cf}'.
'\x{3200}-\x{33ff}\x{4dc0}-\x{4dff}\x{a015}\x{a490}-\x{a716}\x{a802}\x{a806}'.
'\x{a80b}\x{a823}-\x{a82b}\x{d800}-\x{f8ff}\x{fb1e}\x{fb29}\x{fd3e}\x{fd3f}'.
'\x{fdfc}-\x{fe6b}\x{feff}-\x{ff0f}\x{ff1a}-\x{ff20}\x{ff3b}-\x{ff40}\x{ff5b}-'.
'\x{ff65}\x{ff70}\x{ff9e}\x{ff9f}\x{ffe0}-\x{fffd}');

/**
 * Matches all 'N' Unicode character classes (numbers)
 */
define('PREG_CLASS_NUMBERS',
'\x{30}-\x{39}\x{b2}\x{b3}\x{b9}\x{bc}-\x{be}\x{660}-\x{669}\x{6f0}-\x{6f9}'.
'\x{966}-\x{96f}\x{9e6}-\x{9ef}\x{9f4}-\x{9f9}\x{a66}-\x{a6f}\x{ae6}-\x{aef}'.
'\x{b66}-\x{b6f}\x{be7}-\x{bf2}\x{c66}-\x{c6f}\x{ce6}-\x{cef}\x{d66}-\x{d6f}'.
'\x{e50}-\x{e59}\x{ed0}-\x{ed9}\x{f20}-\x{f33}\x{1040}-\x{1049}\x{1369}-'.
'\x{137c}\x{16ee}-\x{16f0}\x{17e0}-\x{17e9}\x{17f0}-\x{17f9}\x{1810}-\x{1819}'.
'\x{1946}-\x{194f}\x{2070}\x{2074}-\x{2079}\x{2080}-\x{2089}\x{2153}-\x{2183}'.
'\x{2460}-\x{249b}\x{24ea}-\x{24ff}\x{2776}-\x{2793}\x{3007}\x{3021}-\x{3029}'.
'\x{3038}-\x{303a}\x{3192}-\x{3195}\x{3220}-\x{3229}\x{3251}-\x{325f}\x{3280}-'.
'\x{3289}\x{32b1}-\x{32bf}\x{ff10}-\x{ff19}');

/**
 * Matches all 'P' Unicode character classes (punctuation)
 */
define('PREG_CLASS_PUNCTUATION',
'\x{21}-\x{23}\x{25}-\x{2a}\x{2c}-\x{2f}\x{3a}\x{3b}\x{3f}\x{40}\x{5b}-\x{5d}'.
'\x{5f}\x{7b}\x{7d}\x{a1}\x{ab}\x{b7}\x{bb}\x{bf}\x{37e}\x{387}\x{55a}-\x{55f}'.
'\x{589}\x{58a}\x{5be}\x{5c0}\x{5c3}\x{5f3}\x{5f4}\x{60c}\x{60d}\x{61b}\x{61f}'.
'\x{66a}-\x{66d}\x{6d4}\x{700}-\x{70d}\x{964}\x{965}\x{970}\x{df4}\x{e4f}'.
'\x{e5a}\x{e5b}\x{f04}-\x{f12}\x{f3a}-\x{f3d}\x{f85}\x{104a}-\x{104f}\x{10fb}'.
'\x{1361}-\x{1368}\x{166d}\x{166e}\x{169b}\x{169c}\x{16eb}-\x{16ed}\x{1735}'.
'\x{1736}\x{17d4}-\x{17d6}\x{17d8}-\x{17da}\x{1800}-\x{180a}\x{1944}\x{1945}'.
'\x{2010}-\x{2027}\x{2030}-\x{2043}\x{2045}-\x{2051}\x{2053}\x{2054}\x{2057}'.
'\x{207d}\x{207e}\x{208d}\x{208e}\x{2329}\x{232a}\x{23b4}-\x{23b6}\x{2768}-'.
'\x{2775}\x{27e6}-\x{27eb}\x{2983}-\x{2998}\x{29d8}-\x{29db}\x{29fc}\x{29fd}'.
'\x{3001}-\x{3003}\x{3008}-\x{3011}\x{3014}-\x{301f}\x{3030}\x{303d}\x{30a0}'.
'\x{30fb}\x{fd3e}\x{fd3f}\x{fe30}-\x{fe52}\x{fe54}-\x{fe61}\x{fe63}\x{fe68}'.
'\x{fe6a}\x{fe6b}\x{ff01}-\x{ff03}\x{ff05}-\x{ff0a}\x{ff0c}-\x{ff0f}\x{ff1a}'.
'\x{ff1b}\x{ff1f}\x{ff20}\x{ff3b}-\x{ff3d}\x{ff3f}\x{ff5b}\x{ff5d}\x{ff5f}-'.
'\x{ff65}');

/**
 * Matches all CJK characters that are candidates for auto-splitting
 * (Chinese, Japanese, Korean).
 * Contains kana and BMP ideographs.
 */
define('PREG_CLASS_CJK', '\x{3041}-\x{30ff}\x{31f0}-\x{31ff}\x{3400}-\x{4db5}'.
'\x{4e00}-\x{9fbb}\x{f900}-\x{fad9}');

Martyn Smith's avatar
Martyn Smith committed
889
?>