summaryrefslogtreecommitdiff
path: root/includes/api/ApiQueryLangLinks.php
blob: da05f2732b7996ed7d4b3a1137236e8d7186da4c (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
<?php
/**
 *
 *
 * Created on May 13, 2007
 *
 * Copyright © 2006 Yuri Astrakhan "<Firstname><Lastname>@gmail.com"
 *
 * 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 Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 */

/**
 * A query module to list all langlinks (links to corresponding foreign language pages).
 *
 * @ingroup API
 */
class ApiQueryLangLinks extends ApiQueryBase {

	public function __construct( ApiQuery $query, $moduleName ) {
		parent::__construct( $query, $moduleName, 'll' );
	}

	public function execute() {
		if ( $this->getPageSet()->getGoodTitleCount() == 0 ) {
			return;
		}

		$params = $this->extractRequestParams();
		$prop = array_flip( (array)$params['prop'] );

		if ( isset( $params['title'] ) && !isset( $params['lang'] ) ) {
			$this->dieUsageMsg( array( 'missingparam', 'lang' ) );
		}

		// Handle deprecated param
		$this->requireMaxOneParameter( $params, 'url', 'prop' );
		if ( $params['url'] ) {
			$this->logFeatureUsage( 'prop=langlinks&llurl' );
			$prop = array( 'url' => 1 );
		}

		$this->addFields( array(
			'll_from',
			'll_lang',
			'll_title'
		) );

		$this->addTables( 'langlinks' );
		$this->addWhereFld( 'll_from', array_keys( $this->getPageSet()->getGoodTitles() ) );
		if ( !is_null( $params['continue'] ) ) {
			$cont = explode( '|', $params['continue'] );
			$this->dieContinueUsageIf( count( $cont ) != 2 );
			$op = $params['dir'] == 'descending' ? '<' : '>';
			$llfrom = intval( $cont[0] );
			$lllang = $this->getDB()->addQuotes( $cont[1] );
			$this->addWhere(
				"ll_from $op $llfrom OR " .
				"(ll_from = $llfrom AND " .
				"ll_lang $op= $lllang)"
			);
		}

		//FIXME: (follow-up) To allow extensions to add to the language links, we need
		//       to load them all, add the extra links, then apply paging.
		//       Should not be terrible, it's not going to be more than a few hundred links.

		// Note that, since (ll_from, ll_lang) is a unique key, we don't need
		// to sort by ll_title to ensure deterministic ordering.
		$sort = ( $params['dir'] == 'descending' ? ' DESC' : '' );
		if ( isset( $params['lang'] ) ) {
			$this->addWhereFld( 'll_lang', $params['lang'] );
			if ( isset( $params['title'] ) ) {
				$this->addWhereFld( 'll_title', $params['title'] );
			}
			$this->addOption( 'ORDER BY', 'll_from' . $sort );
		} else {
			// Don't order by ll_from if it's constant in the WHERE clause
			if ( count( $this->getPageSet()->getGoodTitles() ) == 1 ) {
				$this->addOption( 'ORDER BY', 'll_lang' . $sort );
			} else {
				$this->addOption( 'ORDER BY', array(
					'll_from' . $sort,
					'll_lang' . $sort
				) );
			}
		}

		$this->addOption( 'LIMIT', $params['limit'] + 1 );
		$res = $this->select( __METHOD__ );

		$count = 0;
		foreach ( $res as $row ) {
			if ( ++$count > $params['limit'] ) {
				// We've reached the one extra which shows that
				// there are additional pages to be had. Stop here...
				$this->setContinueEnumParameter( 'continue', "{$row->ll_from}|{$row->ll_lang}" );
				break;
			}
			$entry = array( 'lang' => $row->ll_lang );
			if ( isset( $prop['url'] ) ) {
				$title = Title::newFromText( "{$row->ll_lang}:{$row->ll_title}" );
				if ( $title ) {
					$entry['url'] = wfExpandUrl( $title->getFullURL(), PROTO_CURRENT );
				}
			}
			if ( isset( $prop['langname'] ) ) {
				$entry['langname'] = Language::fetchLanguageName( $row->ll_lang, $params['inlanguagecode'] );
			}
			if ( isset( $prop['autonym'] ) ) {
				$entry['autonym'] = Language::fetchLanguageName( $row->ll_lang );
			}
			ApiResult::setContent( $entry, $row->ll_title );
			$fit = $this->addPageSubItem( $row->ll_from, $entry );
			if ( !$fit ) {
				$this->setContinueEnumParameter( 'continue', "{$row->ll_from}|{$row->ll_lang}" );
				break;
			}
		}
	}

	public function getCacheMode( $params ) {
		return 'public';
	}

	public function getAllowedParams() {
		global $wgContLang;
		return array(
			'limit' => array(
				ApiBase::PARAM_DFLT => 10,
				ApiBase::PARAM_TYPE => 'limit',
				ApiBase::PARAM_MIN => 1,
				ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
				ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
			),
			'continue' => null,
			'url' => array(
				ApiBase::PARAM_DFLT => false,
				ApiBase::PARAM_DEPRECATED => true,
			),
			'prop' => array(
				ApiBase::PARAM_ISMULTI => true,
				ApiBase::PARAM_TYPE => array(
					'url',
					'langname',
					'autonym',
				)
			),
			'lang' => null,
			'title' => null,
			'dir' => array(
				ApiBase::PARAM_DFLT => 'ascending',
				ApiBase::PARAM_TYPE => array(
					'ascending',
					'descending'
				)
			),
			'inlanguagecode' => $wgContLang->getCode(),
		);
	}

	public function getParamDescription() {
		return array(
			'limit' => 'How many langlinks to return',
			'continue' => 'When more results are available, use this to continue',
			'url' => "Whether to get the full URL (Cannot be used with {$this->getModulePrefix()}prop)",
			'prop' => array(
				'Which additional properties to get for each interlanguage link',
				' url      - Adds the full URL',
				' langname - Adds the localised language name (best effort, use CLDR extension)',
				"            Use {$this->getModulePrefix()}inlanguagecode to control the language",
				' autonym  - Adds the native language name',
			),
			'lang' => 'Language code',
			'title' => "Link to search for. Must be used with {$this->getModulePrefix()}lang",
			'dir' => 'The direction in which to list',
			'inlanguagecode' => 'Language code for localised language names',
		);
	}

	public function getDescription() {
		return 'Returns all interlanguage links from the given page(s).';
	}

	public function getExamples() {
		return array(
			'api.php?action=query&prop=langlinks&titles=Main%20Page&redirects='
				=> 'Get interlanguage links from the [[Main Page]]',
		);
	}

	public function getHelpUrls() {
		return 'https://www.mediawiki.org/wiki/API:Properties#langlinks_.2F_ll';
	}
}