|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
namespace dokuwiki\Search; |
|
4
|
|
|
|
|
5
|
|
|
use dokuwiki\Extension\Event; |
|
6
|
|
|
use dokuwiki\Utf8; |
|
7
|
|
|
|
|
8
|
|
|
// set the minimum token length to use in the index |
|
9
|
|
|
// (note, this doesn't apply to numeric tokens) |
|
10
|
|
|
const MINWORDLENGTH = 2; |
|
11
|
|
|
|
|
12
|
|
|
/** |
|
13
|
|
|
* DokuWiki Tokenizer class (Singleton) |
|
14
|
|
|
*/ |
|
15
|
|
|
class Tokenizer |
|
16
|
|
|
{ |
|
17
|
|
|
/** @var Tokenizer */ |
|
18
|
|
|
protected static $instance = null; |
|
19
|
|
|
|
|
20
|
|
|
/** @var array $Stopwords Words that tokenizer ignores */ |
|
21
|
|
|
protected $Stopwords; |
|
22
|
|
|
|
|
23
|
|
|
/** @var int $MinWordLength minimum token length */ |
|
24
|
|
|
protected $MinWordLength; |
|
25
|
|
|
|
|
26
|
|
|
/** |
|
27
|
|
|
* Tokenizer constructor. Singleton, thus protected! |
|
28
|
|
|
*/ |
|
29
|
|
|
protected function __construct() |
|
30
|
|
|
{ |
|
31
|
|
|
// set the minimum token length to use in the index |
|
32
|
|
|
// (note, this doesn't apply to numeric tokens) |
|
33
|
|
|
$this->MinWordLength = (defined('IDX_MINWORDLENGTH')) |
|
34
|
|
|
? IDX_MINWORDLENGTH |
|
35
|
|
|
: MINWORDLENGTH; |
|
36
|
|
|
|
|
37
|
|
|
$this->Stopwords = $this->getStopwords(); |
|
38
|
|
|
} |
|
39
|
|
|
|
|
40
|
|
|
/** |
|
41
|
|
|
* Get new or existing singleton instance of the Tokenizer |
|
42
|
|
|
* |
|
43
|
|
|
* @return Tokenizer |
|
44
|
|
|
*/ |
|
45
|
|
|
public static function getInstance() |
|
46
|
|
|
{ |
|
47
|
|
|
if (is_null(static::$instance)) { |
|
48
|
|
|
static::$instance = new static(); |
|
49
|
|
|
} |
|
50
|
|
|
return static::$instance; |
|
51
|
|
|
} |
|
52
|
|
|
|
|
53
|
|
|
/** |
|
54
|
|
|
* Returns words that will be ignored |
|
55
|
|
|
* |
|
56
|
|
|
* @return array list of stop words |
|
57
|
|
|
* |
|
58
|
|
|
* @author Tom N Harris <[email protected]> |
|
59
|
|
|
*/ |
|
60
|
|
|
public function getStopwords() |
|
61
|
|
|
{ |
|
62
|
|
|
if (!isset($this->Stopwords)) { |
|
63
|
|
|
global $conf; |
|
64
|
|
|
$swFile = DOKU_INC.'inc/lang/'.$conf['lang'].'/stopwords.txt'; |
|
65
|
|
|
if (file_exists($swFile)) { |
|
66
|
|
|
$this->Stopwords = file($swFile, FILE_IGNORE_NEW_LINES); |
|
67
|
|
|
} else { |
|
68
|
|
|
$this->Stopwords = array(); |
|
69
|
|
|
} |
|
70
|
|
|
} |
|
71
|
|
|
return $this->Stopwords; |
|
72
|
|
|
} |
|
73
|
|
|
|
|
74
|
|
|
/** |
|
75
|
|
|
* Returns minimum word length to be used in the index |
|
76
|
|
|
*/ |
|
77
|
|
|
public function getMinWordLength() |
|
78
|
|
|
{ |
|
79
|
|
|
return $this->MinWordLength; |
|
80
|
|
|
} |
|
81
|
|
|
|
|
82
|
|
|
/** |
|
83
|
|
|
* Split the text into words for fulltext search |
|
84
|
|
|
* |
|
85
|
|
|
* @triggers INDEXER_TEXT_PREPARE |
|
86
|
|
|
* This event allows plugins to modify the text before it gets tokenized. |
|
87
|
|
|
* Plugins intercepting this event should also intercept INDEX_VERSION_GET |
|
88
|
|
|
* |
|
89
|
|
|
* @param string $text plain text |
|
90
|
|
|
* @param bool $wc are wildcards allowed? |
|
91
|
|
|
* @return array list of words in the text |
|
92
|
|
|
* |
|
93
|
|
|
* @author Tom N Harris <[email protected]> |
|
94
|
|
|
* @author Andreas Gohr <[email protected]> |
|
95
|
|
|
*/ |
|
96
|
|
|
public function getWords($text, $wc=false) |
|
97
|
|
|
{ |
|
98
|
|
|
$wc = ($wc) ? '' : '\*'; |
|
99
|
|
|
|
|
100
|
|
|
// prepare the text to be tokenized |
|
101
|
|
|
$event = new Event('INDEXER_TEXT_PREPARE', $text); |
|
102
|
|
|
if ($event->advise_before(true)) { |
|
103
|
|
|
if (preg_match('/[^0-9A-Za-z ]/u', $text)) { |
|
104
|
|
|
$text = Utf8\Asian::separateAsianWords($text); |
|
105
|
|
|
} |
|
106
|
|
|
} |
|
107
|
|
|
$event->advise_after(); |
|
108
|
|
|
unset($event); |
|
109
|
|
|
|
|
110
|
|
|
$text = strtr($text, |
|
111
|
|
|
array( |
|
112
|
|
|
"\r" => ' ', |
|
113
|
|
|
"\n" => ' ', |
|
114
|
|
|
"\t" => ' ', |
|
115
|
|
|
"\xC2\xAD" => '', //soft-hyphen |
|
116
|
|
|
) |
|
117
|
|
|
); |
|
118
|
|
|
if (preg_match('/[^0-9A-Za-z ]/u', $text)) { |
|
119
|
|
|
$text = Utf8\Clean::stripspecials($text, ' ', '\._\-:'.$wc); |
|
120
|
|
|
} |
|
121
|
|
|
|
|
122
|
|
|
$wordlist = explode(' ', $text); |
|
123
|
|
|
foreach ($wordlist as $i => $word) { |
|
124
|
|
|
$wordlist[$i] = (preg_match('/[^0-9A-Za-z]/u', $word)) ? |
|
125
|
|
|
Utf8\PhpString::strtolower($word) : strtolower($word); |
|
126
|
|
|
} |
|
127
|
|
|
|
|
128
|
|
|
foreach ($wordlist as $i => $word) { |
|
129
|
|
|
if ((!is_numeric($word) && strlen($word) < $this->MinWordLength) |
|
130
|
|
|
|| array_search($word, $this->getStopwords(), true) !== false) { |
|
131
|
|
|
unset($wordlist[$i]); |
|
132
|
|
|
} |
|
133
|
|
|
} |
|
134
|
|
|
return array_values($wordlist); |
|
135
|
|
|
} |
|
136
|
|
|
} |
|
137
|
|
|
|
splitbrain /
dokuwiki
