|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
namespace Samwilson\SimpleWikidata; |
|
4
|
|
|
|
|
5
|
|
|
use Exception; |
|
6
|
|
|
use GuzzleHttp\Client; |
|
7
|
|
|
use Psr\Cache\CacheItemPoolInterface; |
|
8
|
|
|
use SimpleXmlElement; |
|
9
|
|
|
|
|
10
|
|
|
class Query { |
|
11
|
|
|
|
|
12
|
|
|
/** @var string */ |
|
13
|
|
|
protected $query; |
|
14
|
|
|
|
|
15
|
|
|
/** @var string */ |
|
16
|
|
|
protected $lang; |
|
17
|
|
|
|
|
18
|
|
|
/** @var CacheItemPoolInterface */ |
|
19
|
|
|
protected $cache; |
|
20
|
|
|
|
|
21
|
|
|
/** |
|
22
|
|
|
* Query constructor. |
|
23
|
|
|
* @param string $query The Sparql query. |
|
24
|
|
|
* @param string $lang The language. |
|
25
|
|
|
* @param CacheItemPoolInterface $cache The cache. |
|
26
|
|
|
*/ |
|
27
|
|
|
public function __construct( $query, $lang, CacheItemPoolInterface $cache ) { |
|
28
|
|
|
$this->query = $query; |
|
29
|
|
|
$this->lang = $lang; |
|
30
|
|
|
$this->cache = $cache; |
|
31
|
|
|
} |
|
32
|
|
|
|
|
33
|
|
|
/** |
|
34
|
|
|
* Get the items. |
|
35
|
|
|
* @return Item[] The results. |
|
36
|
|
|
*/ |
|
37
|
|
|
public function getItems() { |
|
38
|
|
|
$xml = $this->getXml( $this->query ); |
|
39
|
|
|
$results = []; |
|
40
|
|
|
foreach ( $xml->results->result as $res ) { |
|
41
|
|
|
$result = $this->getBindings( $res ); |
|
42
|
|
|
$id = substr( $result['item'], strrpos( $result['item'], '/' ) + 1 ); |
|
43
|
|
|
$item = Item::factory( $id, $this->lang, $this->cache ); |
|
44
|
|
|
$results[] = $item; |
|
45
|
|
|
} |
|
46
|
|
|
return $results; |
|
47
|
|
|
} |
|
48
|
|
|
|
|
49
|
|
|
/** |
|
50
|
|
|
* @param string $query The Sparql query. |
|
51
|
|
|
* @return SimpleXmlElement |
|
52
|
|
|
* @throws Exception |
|
53
|
|
|
*/ |
|
54
|
|
|
protected function getXml( $query ) { |
|
55
|
|
|
$url = "https://query.wikidata.org/bigdata/namespace/wdq/sparql"; |
|
56
|
|
|
$client = new Client(); |
|
57
|
|
|
try { |
|
58
|
|
|
$response = $client->request( 'GET', $url, [ |
|
59
|
|
|
// https://meta.wikimedia.org/wiki/User-Agent_policy |
|
60
|
|
|
'User-Agent' => 'samwilson/simple-wikidata (User:Samwilson) PHP', |
|
61
|
|
|
'query' => [ 'query' => $query ], |
|
62
|
|
|
] ); |
|
63
|
|
|
} catch ( Exception $e ) { |
|
64
|
|
|
throw new Exception( "Unable to run query: <pre>" . htmlspecialchars( $query ) . "</pre>", 500 ); |
|
65
|
|
|
} |
|
66
|
|
|
$result = $response->getBody()->getContents(); |
|
67
|
|
|
if ( empty( $result ) ) { |
|
68
|
|
|
$msg = "No result from query: <pre>" . htmlspecialchars( $query ) . "</pre>"; |
|
69
|
|
|
throw new Exception( $msg, 500 ); |
|
70
|
|
|
} |
|
71
|
|
|
$xml = new SimpleXmlElement( $result ); |
|
72
|
|
|
return $xml; |
|
73
|
|
|
} |
|
74
|
|
|
|
|
75
|
|
|
/** |
|
76
|
|
|
* @param SimpleXmlElement $xml The query result XML. |
|
77
|
|
|
* @return array |
|
78
|
|
|
*/ |
|
79
|
|
|
protected function getBindings( $xml ) { |
|
80
|
|
|
$out = []; |
|
81
|
|
|
foreach ( $xml->binding as $binding ) { |
|
82
|
|
|
if ( isset( $binding->literal ) ) { |
|
83
|
|
|
$out[(string)$binding['name']] = (string)$binding->literal; |
|
84
|
|
|
} |
|
85
|
|
|
if ( isset( $binding->uri ) ) { |
|
86
|
|
|
$out[(string)$binding['name']] = (string)$binding->uri; |
|
87
|
|
|
} |
|
88
|
|
|
} |
|
89
|
|
|
return $out; |
|
90
|
|
|
} |
|
91
|
|
|
|
|
92
|
|
|
} |
|
93
|
|
|
|
samwilson /
simple-wikidata
