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
|
<?php
namespace Micropoly\Search;
use LogicException;
use Micropoly\DbQuery;
use Micropoly\Esc;
use Micropoly\Models\Note;
use SQLite3;
class SearchResult
{
private Note $note;
private array $highlights = [];
private function __construct(Note $note, array $highlights)
{
$this->note = $note;
$this->highlights = $highlights;
}
/**
* @param SQLite3 $db
* @param SearchExpr $expr
* @return self[]
*/
public static function search(SQLite3 $db, SearchExpr $expr): array
{
return $expr->countFTSQueries() === 1
? self::searchFTS($db, $expr)
: self::searchComplex($db, $expr);
}
private static function searchComplex(SQLite3 $db, SearchExpr $expr): array
{
$sqlSearchExpr = $expr->toSQL("", false);
$query = new DbQuery("
SELECT
n.id
FROM notes n
INNER JOIN note_contents nc
ON nc.rowid = n.content_row
WHERE {$sqlSearchExpr->sql}
");
foreach ($sqlSearchExpr->bindings as $k => $v)
$query->bind($k, $v);
$ids = array_map(fn ($row) => $row[0], $query->fetchRows($db));
$notes = Note::byIds($db, $ids);
return array_map(fn ($note) => new self($note, []), $notes);
}
private static function highlightRangeContains(array $range, int $point): bool
{
[$start, $end] = $range;
return $start <= $point && $point <= $end;
}
private static function areHighlightsOverlapping(array $a, array $b): bool
{
[$aStart, $aEnd] = $a;
[$bStart, $bEnd] = $b;
return self::highlightRangeContains($a, $bStart)
|| self::highlightRangeContains($a, $bEnd)
|| self::highlightRangeContains($b, $aStart)
|| self::highlightRangeContains($b, $aEnd);
}
private static function parseOffsetsToHighlights(string $offsets): array
{
$offsets = explode(" ", $offsets);
$offsets = array_map("intval", $offsets);
$phraseMatches = count($offsets) / 4;
$highlights = [];
for ($i = 0; $i < $phraseMatches; $i++) {
$off = $offsets[$i * 4 + 2];
$len = $offsets[$i * 4 + 3];
if ($off < 0 || $len === 0)
continue;
$highlights[] = [$off, $off+$len-1];
}
usort($highlights, fn ($a, $b) => ($a[0] <=> $b[0]) ?: ($b[1] <=> $a[1]));
// merge overlapping areas
for ($i = count($highlights)-1; $i >= 0; $i--) {
for ($j = $i-1; $j >= 0; $j--) {
if (self::areHighlightsOverlapping($highlights[$i], $highlights[$j])) {
[$iStart, $iEnd] = $highlights[$i];
[$jStart, $jEnd] = $highlights[$j];
$highlights[$j] = [min($iStart, $jStart), max($iEnd, $jEnd)];
unset($highlights[$i]);
break;
}
}
}
return array_merge($highlights); // array_merge here renumbers the keys
}
private static function searchFTS(SQLite3 $db, SearchExpr $expr)
{
$sqlSearchExpr = $expr->toSQL("", true);
$query = new DbQuery("
SELECT
n.id,
offsets(nc.note_contents) AS offsets
FROM notes n
INNER JOIN note_contents nc
ON nc.rowid = n.content_row
WHERE {$sqlSearchExpr->sql}
");
foreach ($sqlSearchExpr->bindings as $k => $v)
$query->bind($k, $v);
$offsets = $query->fetchIndexedValues($db, "offsets", "id");
$notes = Note::byIds($db, array_keys($offsets));
$out = [];
foreach ($offsets as $id => $offString) {
if (!isset($notes[$id]))
throw new LogicException("Note '{$id}' not loaded but found?");
$out[] = new self($notes[$id], self::parseOffsetsToHighlights($offString));
}
return $out;
}
public function renderHighlightedContent(): string
{
$out = "";
$content = $this->note->getContent();
$lastOff = 0;
foreach ($this->highlights as [$start, $end]) {
$out .= Esc::e(substr($content, $lastOff, $start - $lastOff), Esc::HTML_WITH_BR);
$out .= '<b>' . Esc::e(substr($content, $start, $end - $start + 1), Esc::HTML_WITH_BR) . '</b>';
$lastOff = $end + 1;
}
$out .= Esc::e(substr($content, $lastOff), Esc::HTML_WITH_BR);
return $out;
}
public function getNote(): Note { return $this->note; }
}
|
