summaryrefslogtreecommitdiff
path: root/program/lib/Roundcube/rcube_spellchecker.php
blob: e9e1ceb0fcb9c903bbcf341856028d8c6f137041 (plain)
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
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
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
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
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
<?php

/*
 +-----------------------------------------------------------------------+
 | This file is part of the Roundcube Webmail client                     |
 | Copyright (C) 2011, Kolab Systems AG                                  |
 | Copyright (C) 2008-2011, The Roundcube Dev Team                       |
 |                                                                       |
 | Licensed under the GNU General Public License version 3 or            |
 | any later version with exceptions for skins & plugins.                |
 | See the README file for a full license statement.                     |
 |                                                                       |
 | PURPOSE:                                                              |
 |   Spellchecking using different backends                              |
 +-----------------------------------------------------------------------+
 | Author: Aleksander Machniak <machniak@kolabsys.com>                   |
 | Author: Thomas Bruederli <roundcube@gmail.com>                        |
 +-----------------------------------------------------------------------+
*/

/**
 * Helper class for spellchecking with Googielspell and PSpell support.
 *
 * @package    Framework
 * @subpackage Utils
 */
class rcube_spellchecker
{
    private $matches = array();
    private $engine;
    private $lang;
    private $rc;
    private $error;
    private $separator = '/[\s\r\n\t\(\)\/\[\]{}<>\\"]+|[:;?!,\.]([^\w]|$)/';
    private $options = array();
    private $dict;
    private $have_dict;


    // default settings
    const GOOGLE_HOST = 'ssl://www.google.com';
    const GOOGLE_PORT = 443;
    const MAX_SUGGESTIONS = 10;


    /**
     * Constructor
     *
     * @param string $lang Language code
     */
    function __construct($lang = 'en')
    {
        $this->rc     = rcube::get_instance();
        $this->engine = $this->rc->config->get('spellcheck_engine', 'googie');
        $this->lang   = $lang ? $lang : 'en';

        $this->options = array(
            'ignore_syms' => $this->rc->config->get('spellcheck_ignore_syms'),
            'ignore_nums' => $this->rc->config->get('spellcheck_ignore_nums'),
            'ignore_caps' => $this->rc->config->get('spellcheck_ignore_caps'),
            'dictionary'  => $this->rc->config->get('spellcheck_dictionary'),
        );
    }


    /**
     * Set content and check spelling
     *
     * @param string $text    Text content for spellchecking
     * @param bool   $is_html Enables HTML-to-Text conversion
     *
     * @return bool True when no mispelling found, otherwise false
     */
    function check($text, $is_html = false)
    {
        // convert to plain text
        if ($is_html) {
            $this->content = $this->html2text($text);
        }
        else {
            $this->content = $text;
        }

        if ($this->engine == 'pspell') {
            $this->matches = $this->_pspell_check($this->content);
        }
        else {
            $this->matches = $this->_googie_check($this->content);
        }

        return $this->found() == 0;
    }


    /**
     * Number of mispellings found (after check)
     *
     * @return int Number of mispellings
     */
    function found()
    {
        return count($this->matches);
    }


    /**
     * Returns suggestions for the specified word
     *
     * @param string $word The word
     *
     * @return array Suggestions list
     */
    function get_suggestions($word)
    {
        if ($this->engine == 'pspell') {
            return $this->_pspell_suggestions($word);
        }

        return $this->_googie_suggestions($word);
    }


    /**
     * Returns misspelled words
     *
     * @param string $text The content for spellchecking. If empty content
     *                     used for check() method will be used.
     *
     * @return array List of misspelled words
     */
    function get_words($text = null, $is_html=false)
    {
        if ($this->engine == 'pspell') {
            return $this->_pspell_words($text, $is_html);
        }

        return $this->_googie_words($text, $is_html);
    }


    /**
     * Returns checking result in XML (Googiespell) format
     *
     * @return string XML content
     */
    function get_xml()
    {
        // send output
        $out = '<?xml version="1.0" encoding="'.RCUBE_CHARSET.'"?><spellresult charschecked="'.mb_strlen($this->content).'">';

        foreach ($this->matches as $item) {
            $out .= '<c o="'.$item[1].'" l="'.$item[2].'">';
            $out .= is_array($item[4]) ? implode("\t", $item[4]) : $item[4];
            $out .= '</c>';
        }

        $out .= '</spellresult>';

        return $out;
    }


    /**
     * Returns checking result (misspelled words with suggestions)
     *
     * @return array Spellchecking result. An array indexed by word.
     */
    function get()
    {
        $result = array();

        foreach ($this->matches as $item) {
            if ($this->engine == 'pspell') {
                $word = $item[0];
            }
            else {
                $word = mb_substr($this->content, $item[1], $item[2], RCUBE_CHARSET);
            }
            $result[$word] = is_array($item[4]) ? implode("\t", $item[4]) : $item[4];
        }

        return $result;
    }


    /**
     * Returns error message
     *
     * @return string Error message
     */
    function error()
    {
        return $this->error;
    }


    /**
     * Checks the text using pspell
     *
     * @param string $text Text content for spellchecking
     */
    private function _pspell_check($text)
    {
        // init spellchecker
        $this->_pspell_init();

        if (!$this->plink) {
            return array();
        }

        // tokenize
        $text = preg_split($this->separator, $text, NULL, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_OFFSET_CAPTURE);

        $diff       = 0;
        $matches    = array();

        foreach ($text as $w) {
            $word = trim($w[0]);
            $pos  = $w[1] - $diff;
            $len  = mb_strlen($word);

            // skip exceptions
            if ($this->is_exception($word)) {
            }
            else if (!pspell_check($this->plink, $word)) {
                $suggestions = pspell_suggest($this->plink, $word);

                if (sizeof($suggestions) > self::MAX_SUGGESTIONS) {
                    $suggestions = array_slice($suggestions, 0, self::MAX_SUGGESTIONS);
                }

                $matches[] = array($word, $pos, $len, null, $suggestions);
            }

            $diff += (strlen($word) - $len);
        }

        return $matches;
    }


    /**
     * Returns the misspelled words
     */
    private function _pspell_words($text = null, $is_html=false)
    {
        $result = array();

        if ($text) {
            // init spellchecker
            $this->_pspell_init();

            if (!$this->plink) {
                return array();
            }

            // With PSpell we don't need to get suggestions to return misspelled words
            if ($is_html) {
                $text = $this->html2text($text);
            }

            $text = preg_split($this->separator, $text, NULL, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_OFFSET_CAPTURE);

            foreach ($text as $w) {
                $word = trim($w[0]);

                // skip exceptions
                if ($this->is_exception($word)) {
                    continue;
                }

                if (!pspell_check($this->plink, $word)) {
                    $result[] = $word;
                }
            }

            return $result;
        }

        foreach ($this->matches as $m) {
            $result[] = $m[0];
        }

        return $result;
    }


    /**
     * Returns suggestions for misspelled word
     */
    private function _pspell_suggestions($word)
    {
        // init spellchecker
        $this->_pspell_init();

        if (!$this->plink) {
            return array();
        }

        $suggestions = pspell_suggest($this->plink, $word);

        if (sizeof($suggestions) > self::MAX_SUGGESTIONS)
            $suggestions = array_slice($suggestions, 0, self::MAX_SUGGESTIONS);

        return is_array($suggestions) ? $suggestions : array();
    }


    /**
     * Initializes PSpell dictionary
     */
    private function _pspell_init()
    {
        if (!$this->plink) {
            if (!extension_loaded('pspell')) {
                $this->error = "Pspell extension not available";
                rcube::raise_error(array(
                    'code' => 500, 'type' => 'php',
                    'file' => __FILE__, 'line' => __LINE__,
                    'message' => $this->error), true, false);

                return;
            }

            $this->plink = pspell_new($this->lang, null, null, RCUBE_CHARSET, PSPELL_FAST);
        }

        if (!$this->plink) {
            $this->error = "Unable to load Pspell engine for selected language";
        }
    }


    private function _googie_check($text)
    {
        // spell check uri is configured
        $url = $this->rc->config->get('spellcheck_uri');

        if ($url) {
            $a_uri = parse_url($url);
            $ssl   = ($a_uri['scheme'] == 'https' || $a_uri['scheme'] == 'ssl');
            $port  = $a_uri['port'] ? $a_uri['port'] : ($ssl ? 443 : 80);
            $host  = ($ssl ? 'ssl://' : '') . $a_uri['host'];
            $path  = $a_uri['path'] . ($a_uri['query'] ? '?'.$a_uri['query'] : '') . $this->lang;
        }
        else {
            $host = self::GOOGLE_HOST;
            $port = self::GOOGLE_PORT;
            $path = '/tbproxy/spell?lang=' . $this->lang;
        }

        // Google has some problem with spaces, use \n instead
        $gtext = str_replace(' ', "\n", $text);

        $gtext = '<?xml version="1.0" encoding="utf-8" ?>'
            .'<spellrequest textalreadyclipped="0" ignoredups="0" ignoredigits="1" ignoreallcaps="1">'
            .'<text>' . $gtext . '</text>'
            .'</spellrequest>';

        $store = '';
        if ($fp = fsockopen($host, $port, $errno, $errstr, 30)) {
            $out = "POST $path HTTP/1.0\r\n";
            $out .= "Host: " . str_replace('ssl://', '', $host) . "\r\n";
            $out .= "Content-Length: " . strlen($gtext) . "\r\n";
            $out .= "Content-Type: application/x-www-form-urlencoded\r\n";
            $out .= "Connection: Close\r\n\r\n";
            $out .= $gtext;
            fwrite($fp, $out);

            while (!feof($fp))
                $store .= fgets($fp, 128);
            fclose($fp);
        }

        if (!$store) {
            $this->error = "Empty result from spelling engine";
        }

        preg_match_all('/<c o="([^"]*)" l="([^"]*)" s="([^"]*)">([^<]*)<\/c>/', $store, $matches, PREG_SET_ORDER);

        // skip exceptions (if appropriate options are enabled)
        if (!empty($this->options['ignore_syms']) || !empty($this->options['ignore_nums'])
            || !empty($this->options['ignore_caps']) || !empty($this->options['dictionary'])
        ) {
            foreach ($matches as $idx => $m) {
                $word = mb_substr($text, $m[1], $m[2], RCUBE_CHARSET);
                // skip  exceptions
                if ($this->is_exception($word)) {
                    unset($matches[$idx]);
                }
            }
        }

        return $matches;
    }


    private function _googie_words($text = null, $is_html=false)
    {
        if ($text) {
            if ($is_html) {
                $text = $this->html2text($text);
            }

            $matches = $this->_googie_check($text);
        }
        else {
            $matches = $this->matches;
            $text    = $this->content;
        }

        $result = array();

        foreach ($matches as $m) {
            $result[] = mb_substr($text, $m[1], $m[2], RCUBE_CHARSET);
        }

        return $result;
    }


    private function _googie_suggestions($word)
    {
        if ($word) {
            $matches = $this->_googie_check($word);
        }
        else {
            $matches = $this->matches;
        }

        if ($matches[0][4]) {
            $suggestions = explode("\t", $matches[0][4]);
            if (sizeof($suggestions) > self::MAX_SUGGESTIONS) {
                $suggestions = array_slice($suggestions, 0, MAX_SUGGESTIONS);
            }

            return $suggestions;
        }

        return array();
    }


    private function html2text($text)
    {
        $h2t = new html2text($text, false, true, 0);
        return $h2t->get_text();
    }


    /**
     * Check if the specified word is an exception accoring to 
     * spellcheck options.
     *
     * @param string  $word  The word
     *
     * @return bool True if the word is an exception, False otherwise
     */
    public function is_exception($word)
    {
        // Contain only symbols (e.g. "+9,0", "2:2")
        if (!$word || preg_match('/^[0-9@#$%^&_+~*=:;?!,.-]+$/', $word))
            return true;

        // Contain symbols (e.g. "g@@gle"), all symbols excluding separators
        if (!empty($this->options['ignore_syms']) && preg_match('/[@#$%^&_+~*=-]/', $word))
            return true;

        // Contain numbers (e.g. "g00g13")
        if (!empty($this->options['ignore_nums']) && preg_match('/[0-9]/', $word))
            return true;

        // Blocked caps (e.g. "GOOGLE")
        if (!empty($this->options['ignore_caps']) && $word == mb_strtoupper($word))
            return true;

        // Use exceptions from dictionary
        if (!empty($this->options['dictionary'])) {
            $this->load_dict();

            // @TODO: should dictionary be case-insensitive?
            if (!empty($this->dict) && in_array($word, $this->dict))
                return true;
        }

        return false;
    }


    /**
     * Add a word to dictionary
     *
     * @param string  $word  The word to add
     */
    public function add_word($word)
    {
        $this->load_dict();

        foreach (explode(' ', $word) as $word) {
            // sanity check
            if (strlen($word) < 512) {
                $this->dict[] = $word;
                $valid = true;
            }
        }

        if ($valid) {
            $this->dict = array_unique($this->dict);
            $this->update_dict();
        }
    }


    /**
     * Remove a word from dictionary
     *
     * @param string  $word  The word to remove
     */
    public function remove_word($word)
    {
        $this->load_dict();

        if (($key = array_search($word, $this->dict)) !== false) {
            unset($this->dict[$key]);
            $this->update_dict();
        }
    }


    /**
     * Update dictionary row in DB
     */
    private function update_dict()
    {
        if (strcasecmp($this->options['dictionary'], 'shared') != 0) {
            $userid = $this->rc->get_user_id();
        }

        $plugin = $this->rc->plugins->exec_hook('spell_dictionary_save', array(
            'userid' => $userid, 'language' => $this->lang, 'dictionary' => $this->dict));

        if (!empty($plugin['abort'])) {
            return;
        }

        if ($this->have_dict) {
            if (!empty($this->dict)) {
                $this->rc->db->query(
                    "UPDATE ".$this->rc->db->table_name('dictionary')
                    ." SET data = ?"
                    ." WHERE user_id " . ($plugin['userid'] ? "= ".$this->rc->db->quote($plugin['userid']) : "IS NULL")
                        ." AND " . $this->rc->db->quoteIdentifier('language') . " = ?",
                    implode(' ', $plugin['dictionary']), $plugin['language']);
            }
            // don't store empty dict
            else {
                $this->rc->db->query(
                    "DELETE FROM " . $this->rc->db->table_name('dictionary')
                    ." WHERE user_id " . ($plugin['userid'] ? "= ".$this->rc->db->quote($plugin['userid']) : "IS NULL")
                        ." AND " . $this->rc->db->quoteIdentifier('language') . " = ?",
                    $plugin['language']);
            }
        }
        else if (!empty($this->dict)) {
            $this->rc->db->query(
                "INSERT INTO " .$this->rc->db->table_name('dictionary')
                ." (user_id, " . $this->rc->db->quoteIdentifier('language') . ", data) VALUES (?, ?, ?)",
                $plugin['userid'], $plugin['language'], implode(' ', $plugin['dictionary']));
        }
    }


    /**
     * Get dictionary from DB
     */
    private function load_dict()
    {
        if (is_array($this->dict)) {
            return $this->dict;
        }

        if (strcasecmp($this->options['dictionary'], 'shared') != 0) {
            $userid = $this->rc->get_user_id();
        }

        $plugin = $this->rc->plugins->exec_hook('spell_dictionary_get', array(
            'userid' => $userid, 'language' => $this->lang, 'dictionary' => array()));

        if (empty($plugin['abort'])) {
            $dict = array();
            $this->rc->db->query(
                "SELECT data FROM ".$this->rc->db->table_name('dictionary')
                ." WHERE user_id ". ($plugin['userid'] ? "= ".$this->rc->db->quote($plugin['userid']) : "IS NULL")
                    ." AND " . $this->rc->db->quoteIdentifier('language') . " = ?",
                $plugin['language']);

            if ($sql_arr = $this->rc->db->fetch_assoc($sql_result)) {
                $this->have_dict = true;
                if (!empty($sql_arr['data'])) {
                    $dict = explode(' ', $sql_arr['data']);
                }
            }

            $plugin['dictionary'] = array_merge((array)$plugin['dictionary'], $dict);
        }

        if (!empty($plugin['dictionary']) && is_array($plugin['dictionary'])) {
            $this->dict = $plugin['dictionary'];
        }
        else {
            $this->dict = array();
        }

        return $this->dict;
    }

}