polylang / include / class-polylang.php

class-polylang.php in Polylang 2.3.2, at include/class-polylang.php

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1	<?php
2
3	if ( ! defined( 'ABSPATH' ) ) {
4	exit; // Don't access directly
5	};
6
7	// Default directory to store user data such as custom flags
8	if ( ! defined( 'PLL_LOCAL_DIR' ) ) {
9	define( 'PLL_LOCAL_DIR', WP_CONTENT_DIR . '/polylang' );
10	}
11
12	// Includes local config file if exists
13	if ( file_exists( PLL_LOCAL_DIR . '/pll-config.php' ) ) {
14	include_once PLL_LOCAL_DIR . '/pll-config.php';
15	}
16
17	/**
18	* Controls the plugin, as well as activation, and deactivation
19	*
20	* @since 0.1
21	*/
22	class Polylang {
23
24	/**
25	* Constructor
26	*
27	* @since 0.1
28	*/
29	public function __construct() {
30	require_once PLL_INC . '/functions.php'; // VIP functions
31	spl_autoload_register( array( $this, 'autoload' ) ); // Autoload classes
32
33	$install = new PLL_Install( POLYLANG_BASENAME );
34
35	// Stopping here if we are going to deactivate the plugin ( avoids breaking rewrite rules )
36	if ( $install->is_deactivation() ) {
37	return;
38	}
39
40	// Plugin initialization
41	// Take no action before all plugins are loaded
42	add_action( 'plugins_loaded', array( $this, 'init' ), 1 );
43
44	// Override load text domain waiting for the language to be defined
45	// Here for plugins which load text domain as soon as loaded :(
46	if ( ! defined( 'PLL_OLT' ) \|\| PLL_OLT ) {
47	PLL_OLT_Manager::instance();
48	}
49
50	// Extra code for compatibility with some plugins
51	// Loaded as soon as possible as we may need to act before other plugins are loaded
52	if ( ! defined( 'PLL_PLUGINS_COMPAT' ) \|\| PLL_PLUGINS_COMPAT ) {
53	PLL_Plugins_Compat::instance();
54	}
55	}
56
57	/**
58	* Autoload classes
59	*
60	* @since 1.2
61	*
62	* @param string $class
63	*/
64	public function autoload( $class ) {
65	// Not a Polylang class
66	if ( 0 !== strncmp( 'PLL_', $class, 4 ) ) {
67	return;
68	}
69
70	$class = str_replace( '_', '-', strtolower( substr( $class, 4 ) ) );
71	$to_find = array( 'media', 'share', 'slug', 'slugs', 'sync', 'translate', 'wpml', 'xdata', 'rest' );
72	$dir = implode( '-', array_intersect( explode( '-', $class ), $to_find ) );
73
74	$dirs = array(
75	PLL_FRONT_INC,
76	PLL_MODULES_INC,
77	PLL_MODULES_INC . "/$dir",
78	PLL_MODULES_INC . '/plugins',
79	PLL_INSTALL_INC,
80	PLL_ADMIN_INC,
81	PLL_SETTINGS_INC,
82	PLL_INC,
83	);
84
85	foreach ( $dirs as $dir ) {
86	if ( file_exists( $file = "$dir/$class.php" ) ) {
87	require_once $file;
88	return;
89	}
90	}
91	}
92
93	/**
94	* Tells whether the current request is an ajax request on frontend or not
95	*
96	* @since 2.2
97	*
98	* @return bool
99	*/
100	static public function is_ajax_on_front() {
101	// Special test for plupload which does not use jquery ajax and thus does not pass our ajax prefilter
102	// Special test for customize_save done in frontend but for which we want to load the admin
103	$in = isset( $_REQUEST['action'] ) && in_array( $_REQUEST['action'], array( 'upload-attachment', 'customize_save' ) );
104	$is_ajax_on_front = wp_doing_ajax() && empty( $_REQUEST['pll_ajax_backend'] ) && ! $in;
105
106	/**
107	* Filters whether the current request is an ajax request on front.
108	*
109	* @since 2.3
110	*
111	* @param bool $is_ajax_on_front Whether the current request is an ajax request on front.
112	*/
113	return apply_filters( 'pll_is_ajax_on_front', $is_ajax_on_front );
114	}
115
116	/**
117	* Defines constants
118	* May be overridden by a plugin if set before plugins_loaded, 1
119	*
120	* @since 1.6
121	*/
122	static public function define_constants() {
123	// Cookie name. no cookie will be used if set to false
124	if ( ! defined( 'PLL_COOKIE' ) ) {
125	define( 'PLL_COOKIE', 'pll_language' );
126	}
127
128	// Backward compatibility with Polylang < 2.3
129	if ( ! defined( 'PLL_AJAX_ON_FRONT' ) ) {
130	define( 'PLL_AJAX_ON_FRONT', self::is_ajax_on_front() );
131	}
132
133	// Admin
134	if ( ! defined( 'PLL_ADMIN' ) ) {
135	define( 'PLL_ADMIN', defined( 'DOING_CRON' ) \|\| ( defined( 'WP_CLI' ) && WP_CLI ) \|\| ( is_admin() && ! PLL_AJAX_ON_FRONT ) );
136	}
137
138	// Settings page whatever the tab
139	if ( ! defined( 'PLL_SETTINGS' ) ) {
140	define( 'PLL_SETTINGS', is_admin() && ( ( isset( $_GET['page'] ) && 0 === strpos( $_GET['page'], 'mlang' ) ) \|\| ! empty( $_REQUEST['pll_ajax_settings'] ) ) );
141	}
142	}
143
144	/**
145	* Should we activate Polylang on front
146	*
147	* @since 2.3.2
148	*
149	* @param object $model
150	* @return bool
151	*/
152	protected function is_active_on_front( $model ) {
153	// Do nothing on frontend if no language is defined
154	// Or if it is a REST request and the compatibility class is not present
155	return $model->get_languages_list() &&
156	empty( $_GET['deactivate-polylang'] ) && (
157	class_exists( 'PLL_REST_Translated_Object' ) \|\|
158	false === strpos( str_replace( 'index.php', '', $_SERVER['REQUEST_URI'] ), '/' . rest_get_url_prefix() . '/' )
159	);
160	}
161
162	/**
163	* Polylang initialization
164	* setups models and separate admin and frontend
165	*
166	* @since 1.2
167	*/
168	public function init() {
169	global $polylang;
170
171	self::define_constants();
172	$options = get_option( 'polylang' );
173
174	// Plugin upgrade
175	if ( $options && version_compare( $options['version'], POLYLANG_VERSION, '<' ) ) {
176	$upgrade = new PLL_Upgrade( $options );
177	if ( ! $upgrade->upgrade() ) { // If the version is too old
178	return;
179	}
180	}
181
182	// Make sure that this filter is always added before PLL_Model::get_languages_list() is called for the first time
183	add_filter( 'pll_languages_list', array( 'PLL_Static_Pages', 'pll_languages_list' ), 2, 2 ); // Before PLL_Links_Model
184
185	/**
186	* Filter the model class to use
187	* /!\ this filter is fired before the $polylang object is available
188	*
189	* @since 1.5
190	*
191	* @param string $class either PLL_Model or PLL_Admin_Model
192	*/
193	$class = apply_filters( 'pll_model', PLL_SETTINGS ? 'PLL_Admin_Model' : 'PLL_Model' );
194	$model = new $class( $options );
195	$links_model = $model->get_links_model();
196
197	if ( PLL_SETTINGS ) {
198	$polylang = new PLL_Settings( $links_model );
199	} elseif ( PLL_ADMIN ) {
200	$polylang = new PLL_Admin( $links_model );
201	} elseif ( $this->is_active_on_front( $model ) ) {
202	$polylang = new PLL_Frontend( $links_model );
203	}
204
205	if ( ! $model->get_languages_list() ) {
206	/**
207	* Fires when no language has been defined yet
208	* Used to load overridden textdomains
209	*
210	* @since 1.2
211	*/
212	do_action( 'pll_no_language_defined' );
213	}
214
215	if ( ! empty( $polylang ) ) {
216	/**
217	* Fires after the $polylang object is created and before the API is loaded
218	*
219	* @since 2.0
220	*
221	* @param object $polylang
222	*/
223	do_action_ref_array( 'pll_pre_init', array( &$polylang ) );
224
225	require_once PLL_INC . '/api.php'; // Loads the API
226
227	if ( ! defined( 'PLL_WPML_COMPAT' ) \|\| PLL_WPML_COMPAT ) {
228	PLL_WPML_Compat::instance(); // WPML API
229	PLL_WPML_Config::instance(); // wpml-config.xml
230	}
231
232	$polylang->init();
233
234	/**
235	* Fires after the $polylang object and the API is loaded
236	*
237	* @since 1.7
238	*
239	* @param object $polylang
240	*/
241	do_action_ref_array( 'pll_init', array( &$polylang ) );
242	}
243	}
244	}
245
246	new Polylang();
247