polylang / include / class-polylang.php

class-polylang.php in Polylang 1.8.2, 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	// FIXME maybe not available on every installations but widely used by WP plugins
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_remove = array( 'post-', 'term-', 'settings-', 'admin-', 'frontend-', '-config', '-compat', '-model', 'advanced-' );
72	$dir = str_replace( $to_remove, array(), $class );
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	* defines constants
95	* may be overriden by a plugin if set before plugins_loaded, 1
96	*
97	* @since 1.6
98	*/
99	static public function define_constants() {
100	// our url. Don't use WP_PLUGIN_URL http://wordpress.org/support/topic/ssl-doesnt-work-properly
101	if ( ! defined( 'POLYLANG_URL' ) ) {
102	define( 'POLYLANG_URL', plugins_url( '', POLYLANG_FILE ) );
103	}
104
105	// default url to access user data such as custom flags
106	if ( ! defined( 'PLL_LOCAL_URL' ) ) {
107	define( 'PLL_LOCAL_URL', content_url( '/polylang' ) );
108	}
109
110	// cookie name. no cookie will be used if set to false
111	if ( ! defined( 'PLL_COOKIE' ) ) {
112	define( 'PLL_COOKIE', 'pll_language' );
113	}
114
115	// avoid loading polylang admin for frontend ajax requests
116	// special test for plupload which does not use jquery ajax and thus does not pass our ajax prefilter
117	// special test for customize_save done in frontend but for which we want to load the admin
118	if ( ! defined( 'PLL_AJAX_ON_FRONT' ) ) {
119	$in = isset( $_REQUEST['action'] ) && in_array( $_REQUEST['action'], array( 'upload-attachment', 'customize_save' ) );
120	define( 'PLL_AJAX_ON_FRONT', defined( 'DOING_AJAX' ) && DOING_AJAX && empty( $_REQUEST['pll_ajax_backend'] ) && ! $in );
121	}
122
123	// admin
124	if ( ! defined( 'PLL_ADMIN' ) ) {
125	define( 'PLL_ADMIN', defined( 'DOING_CRON' ) \|\| ( is_admin() && ! PLL_AJAX_ON_FRONT ) );
126	}
127
128	// settings page whatever the tab
129	if ( ! defined( 'PLL_SETTINGS' ) ) {
130	define( 'PLL_SETTINGS', is_admin() && ( ( isset( $_GET['page'] ) && 'mlang' == $_GET['page'] ) \|\| ( isset( $_POST['action'] ) && 'pll_save_options' == $_POST['action'] ) ) );
131	}
132	}
133
134	/*
135	* Polylang initialization
136	* setups models and separate admin and frontend
137	*
138	* @since 1.2
139	*/
140	public function init() {
141	global $polylang;
142
143	self::define_constants();
144	$options = get_option( 'polylang' );
145
146	// plugin upgrade
147	if ( $options && version_compare( $options['version'], POLYLANG_VERSION, '<' ) ) {
148	$upgrade = new PLL_Upgrade( $options );
149	if ( ! $upgrade->upgrade() ) { // if the version is too old
150	return;
151	}
152	}
153
154	// /!\ this filter is fired before the $polylang object is available
155	$class = apply_filters( 'pll_model', PLL_SETTINGS ? 'PLL_Admin_Model' : 'PLL_Model' );
156	$model = new $class( $options );
157	$links_model = $model->get_links_model();
158
159	add_filter( 'pll_languages_list', array( 'PLL_Static_Pages', 'pll_languages_list' ), 2, 2 ); // before PLL_Links_Model
160
161	if ( PLL_SETTINGS ) {
162	$polylang = new PLL_Settings( $links_model );
163	}
164	elseif ( PLL_ADMIN ) {
165	$polylang = new PLL_Admin( $links_model );
166	}
167	// do nothing on frontend if no language is defined
168	elseif ( $model->get_languages_list() && empty( $_GET['deactivate-polylang'] ) ) {
169	$polylang = new PLL_Frontend( $links_model );
170	}
171
172	if ( ! $model->get_languages_list() ) {
173	do_action( 'pll_no_language_defined' ); // to load overriden textdomains
174	}
175
176	if ( ! empty( $polylang ) ) {
177	require_once( PLL_INC.'/api.php' ); // loads the API
178
179	if ( ! defined( 'PLL_WPML_COMPAT' ) \|\| PLL_WPML_COMPAT ) {
180	PLL_WPML_Compat::instance(); // WPML API
181	PLL_WPML_Config::instance(); // wpml-config.xml
182	}
183
184	$polylang->init();
185	do_action( 'pll_init', $polylang );
186	}
187	}
188	}
189
190	new Polylang();
191