polylang / frontend / frontend.php

frontend.php in Polylang 3.1.4, at frontend/frontend.php

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1	<?php
2	/**
3	* @package Polylang
4	*/
5
6	/**
7	* Main Polylang class when on frontend, accessible from @see PLL().
8	*
9	* @since 1.2
10	*/
11	class PLL_Frontend extends PLL_Base {
12	/**
13	* Current language.
14	*
15	* @var PLL_Language
16	*/
17	public $curlang;
18
19	/**
20	* @var PLL_Frontend_Auto_Translate
21	*/
22	public $auto_translate;
23
24	/**
25	* The class selecting the current language.
26	*
27	* @var PLL_Choose_Lang
28	*/
29	public $choose_lang;
30
31	/**
32	* @var PLL_Frontend_Filters
33	*/
34	public $filters;
35
36	/**
37	* @var PLL_Frontend_Filters_Links
38	*/
39	public $filters_links;
40
41	/**
42	* @var PLL_Frontend_Filters_Search
43	*/
44	public $filters_search;
45
46	/**
47	* @var PLL_Frontend_Links
48	*/
49	public $links;
50
51	/**
52	* @var PLL_Frontend_Nav_Menu
53	*/
54	public $nav_menu;
55
56	/**
57	* @var PLL_Frontend_Static_Pages
58	*/
59	public $static_pages;
60
61	/**
62	* @var PLL_Frontend_Filters_Widgets
63	*/
64	public $filters_widgets;
65
66	/**
67	* Constructor.
68	*
69	* @since 1.2
70	*
71	* @param PLL_Links_Model $links_model Reference to the links model.
72	*/
73	public function __construct( &$links_model ) {
74	parent::__construct( $links_model );
75
76	add_action( 'pll_language_defined', array( $this, 'pll_language_defined' ), 1 );
77
78	// Avoids the language being the queried object when querying multiple taxonomies
79	add_action( 'parse_tax_query', array( $this, 'parse_tax_query' ), 1 );
80
81	// Filters posts by language
82	add_action( 'parse_query', array( $this, 'parse_query' ), 6 );
83
84	// Not before 'check_canonical_url'
85	if ( ! defined( 'PLL_AUTO_TRANSLATE' ) \|\| PLL_AUTO_TRANSLATE ) {
86	add_action( 'template_redirect', array( $this, 'auto_translate' ), 7 );
87	}
88	}
89
90	/**
91	* Setups the language chooser based on options
92	*
93	* @since 1.2
94	*/
95	public function init() {
96	parent::init();
97
98	$this->links = new PLL_Frontend_Links( $this );
99
100	// Static front page and page for posts
101	if ( 'page' === get_option( 'show_on_front' ) ) {
102	$this->static_pages = new PLL_Frontend_Static_Pages( $this );
103	}
104
105	// Setup the language chooser
106	$c = array( 'Content', 'Url', 'Url', 'Domain' );
107	$class = 'PLL_Choose_Lang_' . $c[ $this->options['force_lang'] ];
108	$this->choose_lang = new $class( $this );
109	$this->choose_lang->init();
110
111	// Need to load nav menu class early to correctly define the locations in the customizer when the language is set from the content
112	$this->nav_menu = new PLL_Frontend_Nav_Menu( $this );
113	}
114
115	/**
116	* Setups filters and nav menus once the language has been defined
117	*
118	* @since 1.2
119	*
120	* @return void
121	*/
122	public function pll_language_defined() {
123	// Filters
124	$this->filters_links = new PLL_Frontend_Filters_Links( $this );
125	$this->filters = new PLL_Frontend_Filters( $this );
126	$this->filters_search = new PLL_Frontend_Filters_Search( $this );
127	$this->filters_widgets = new PLL_Frontend_Filters_Widgets( $this );
128
129	// Auto translate for Ajax
130	if ( ( ! defined( 'PLL_AUTO_TRANSLATE' ) \|\| PLL_AUTO_TRANSLATE ) && wp_doing_ajax() ) {
131	$this->auto_translate();
132	}
133	}
134
135	/**
136	* When querying multiple taxonomies, makes sure that the language is not the queried object.
137	*
138	* @since 1.8
139	*
140	* @param WP_Query $query WP_Query object.
141	* @return void
142	*/
143	public function parse_tax_query( $query ) {
144	$pll_query = new PLL_Query( $query, $this->model );
145	$queried_taxonomies = $pll_query->get_queried_taxonomies();
146
147	if ( ! empty( $queried_taxonomies ) && 'language' == reset( $queried_taxonomies ) ) {
148	$query->tax_query->queried_terms['language'] = array_shift( $query->tax_query->queried_terms );
149	}
150	}
151
152	/**
153	* Modifies some query vars to "hide" that the language is a taxonomy and avoid conflicts.
154	*
155	* @since 1.2
156	*
157	* @param WP_Query $query WP_Query object.
158	* @return void
159	*/
160	public function parse_query( $query ) {
161	$qv = $query->query_vars;
162	$pll_query = new PLL_Query( $query, $this->model );
163	$taxonomies = $pll_query->get_queried_taxonomies();
164
165	// Allow filtering recent posts and secondary queries by the current language
166	if ( ! empty( $this->curlang ) ) {
167	$pll_query->filter_query( $this->curlang );
168	}
169
170	// Modifies query vars when the language is queried
171	if ( ! empty( $qv['lang'] ) \|\| ( ! empty( $taxonomies ) && array( 'language' ) == array_values( $taxonomies ) ) ) {
172	// Do we query a custom taxonomy?
173	$taxonomies = array_diff( $taxonomies, array( 'language', 'category', 'post_tag' ) );
174
175	// Remove pages query when the language is set unless we do a search
176	// Take care not to break the single page, attachment and taxonomies queries!
177	if ( empty( $qv['post_type'] ) && ! $query->is_search && ! $query->is_singular && empty( $taxonomies ) && ! $query->is_category && ! $query->is_tag ) {
178	$query->set( 'post_type', 'post' );
179	}
180
181	// Unset the is_archive flag for language pages to prevent loading the archive template
182	// Keep archive flag for comment feed otherwise the language filter does not work
183	if ( empty( $taxonomies ) && ! $query->is_comment_feed && ! $query->is_post_type_archive && ! $query->is_date && ! $query->is_author && ! $query->is_category && ! $query->is_tag ) {
184	$query->is_archive = false;
185	}
186
187	// Unset the is_tax flag except if another custom tax is queried
188	if ( empty( $taxonomies ) && ( $query->is_category \|\| $query->is_tag \|\| $query->is_author \|\| $query->is_post_type_archive \|\| $query->is_date \|\| $query->is_search \|\| $query->is_feed ) ) {
189	$query->is_tax = false;
190	unset( $query->queried_object ); // FIXME useless?
191	}
192	}
193	}
194
195	/**
196	* Auto translate posts and terms ids
197	*
198	* @since 1.2
199	*
200	* @return void
201	*/
202	public function auto_translate() {
203	$this->auto_translate = new PLL_Frontend_Auto_Translate( $this );
204	}
205
206	/**
207	* Resets some variables when the blog is switched.
208	* Overrides the parent method.
209	*
210	* @since 1.5.1
211	*
212	* @param int $new_blog_id New blog ID.
213	* @param int $prev_blog_id Previous blog ID.
214	* @return void
215	*/
216	public function switch_blog( $new_blog_id, $prev_blog_id ) {
217	parent::switch_blog( $new_blog_id, $prev_blog_id );
218
219	// Need to check that some languages are defined when user is logged in, has several blogs, some without any languages.
220	if ( $this->is_active_on_new_blog( $new_blog_id, $prev_blog_id ) && did_action( 'pll_language_defined' ) && $this->model->get_languages_list() ) {
221	static $restore_curlang;
222	if ( empty( $restore_curlang ) ) {
223	$restore_curlang = $this->curlang->slug; // To always remember the current language through blogs.
224	}
225
226	$lang = $this->model->get_language( $restore_curlang );
227	$this->curlang = $lang ? $lang : $this->model->get_language( $this->options['default_lang'] );
228
229	if ( isset( $this->static_pages ) ) {
230	$this->static_pages->init();
231	}
232
233	$this->load_strings_translations();
234	}
235	}
236	}
237