polylang / frontend / frontend.php

frontend.php in Polylang 3.0.1, 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	* Constructor.
63	*
64	* @since 1.2
65	*
66	* @param PLL_Links_Model $links_model Reference to the links model.
67	*/
68	public function __construct( &$links_model ) {
69	parent::__construct( $links_model );
70
71	add_action( 'pll_language_defined', array( $this, 'pll_language_defined' ), 1 );
72
73	// Avoids the language being the queried object when querying multiple taxonomies
74	add_action( 'parse_tax_query', array( $this, 'parse_tax_query' ), 1 );
75
76	// Filters posts by language
77	add_action( 'parse_query', array( $this, 'parse_query' ), 6 );
78
79	// Not before 'check_canonical_url'
80	if ( ! defined( 'PLL_AUTO_TRANSLATE' ) \|\| PLL_AUTO_TRANSLATE ) {
81	add_action( 'template_redirect', array( $this, 'auto_translate' ), 7 );
82	}
83	}
84
85	/**
86	* Setups the language chooser based on options
87	*
88	* @since 1.2
89	*/
90	public function init() {
91	parent::init();
92
93	$this->links = new PLL_Frontend_Links( $this );
94
95	// Static front page and page for posts
96	if ( 'page' === get_option( 'show_on_front' ) ) {
97	$this->static_pages = new PLL_Frontend_Static_Pages( $this );
98	}
99
100	// Setup the language chooser
101	$c = array( 'Content', 'Url', 'Url', 'Domain' );
102	$class = 'PLL_Choose_Lang_' . $c[ $this->options['force_lang'] ];
103	$this->choose_lang = new $class( $this );
104	$this->choose_lang->init();
105
106	// Need to load nav menu class early to correctly define the locations in the customizer when the language is set from the content
107	$this->nav_menu = new PLL_Frontend_Nav_Menu( $this );
108	}
109
110	/**
111	* Setups filters and nav menus once the language has been defined
112	*
113	* @since 1.2
114	*
115	* @return void
116	*/
117	public function pll_language_defined() {
118	// Filters
119	$this->filters_links = new PLL_Frontend_Filters_Links( $this );
120	$this->filters = new PLL_Frontend_Filters( $this );
121	$this->filters_search = new PLL_Frontend_Filters_Search( $this );
122
123	// Auto translate for Ajax
124	if ( ( ! defined( 'PLL_AUTO_TRANSLATE' ) \|\| PLL_AUTO_TRANSLATE ) && wp_doing_ajax() ) {
125	$this->auto_translate();
126	}
127	}
128
129	/**
130	* When querying multiple taxonomies, makes sure that the language is not the queried object.
131	*
132	* @since 1.8
133	*
134	* @param WP_Query $query WP_Query object.
135	* @return void
136	*/
137	public function parse_tax_query( $query ) {
138	$pll_query = new PLL_Query( $query, $this->model );
139	$queried_taxonomies = $pll_query->get_queried_taxonomies();
140
141	if ( ! empty( $queried_taxonomies ) && 'language' == reset( $queried_taxonomies ) ) {
142	$query->tax_query->queried_terms['language'] = array_shift( $query->tax_query->queried_terms );
143	}
144	}
145
146	/**
147	* Modifies some query vars to "hide" that the language is a taxonomy and avoid conflicts.
148	*
149	* @since 1.2
150	*
151	* @param WP_Query $query WP_Query object.
152	* @return void
153	*/
154	public function parse_query( $query ) {
155	$qv = $query->query_vars;
156	$pll_query = new PLL_Query( $query, $this->model );
157	$taxonomies = $pll_query->get_queried_taxonomies();
158
159	// Allow filtering recent posts and secondary queries by the current language
160	if ( ! empty( $this->curlang ) ) {
161	$pll_query->filter_query( $this->curlang );
162	}
163
164	// Modifies query vars when the language is queried
165	if ( ! empty( $qv['lang'] ) \|\| ( ! empty( $taxonomies ) && array( 'language' ) == array_values( $taxonomies ) ) ) {
166	// Do we query a custom taxonomy?
167	$taxonomies = array_diff( $taxonomies, array( 'language', 'category', 'post_tag' ) );
168
169	// Remove pages query when the language is set unless we do a search
170	// Take care not to break the single page, attachment and taxonomies queries!
171	if ( empty( $qv['post_type'] ) && ! $query->is_search && ! $query->is_singular && empty( $taxonomies ) && ! $query->is_category && ! $query->is_tag ) {
172	$query->set( 'post_type', 'post' );
173	}
174
175	// Unset the is_archive flag for language pages to prevent loading the archive template
176	// Keep archive flag for comment feed otherwise the language filter does not work
177	if ( empty( $taxonomies ) && ! $query->is_comment_feed && ! $query->is_post_type_archive && ! $query->is_date && ! $query->is_author && ! $query->is_category && ! $query->is_tag ) {
178	$query->is_archive = false;
179	}
180
181	// Unset the is_tax flag except if another custom tax is queried
182	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 ) ) {
183	$query->is_tax = false;
184	unset( $query->queried_object ); // FIXME useless?
185	}
186	}
187	}
188
189	/**
190	* Auto translate posts and terms ids
191	*
192	* @since 1.2
193	*
194	* @return void
195	*/
196	public function auto_translate() {
197	$this->auto_translate = new PLL_Frontend_Auto_Translate( $this );
198	}
199
200	/**
201	* Resets some variables when the blog is switched.
202	* Overrides the parent method.
203	*
204	* @since 1.5.1
205	*
206	* @param int $new_blog_id New blog ID.
207	* @param int $prev_blog_id Previous blog ID.
208	* @return void
209	*/
210	public function switch_blog( $new_blog_id, $prev_blog_id ) {
211	parent::switch_blog( $new_blog_id, $prev_blog_id );
212
213	// Need to check that some languages are defined when user is logged in, has several blogs, some without any languages.
214	if ( $this->is_active_on_new_blog( $new_blog_id, $prev_blog_id ) && did_action( 'pll_language_defined' ) && $this->model->get_languages_list() ) {
215	static $restore_curlang;
216	if ( empty( $restore_curlang ) ) {
217	$restore_curlang = $this->curlang->slug; // To always remember the current language through blogs.
218	}
219
220	$lang = $this->model->get_language( $restore_curlang );
221	$this->curlang = $lang ? $lang : $this->model->get_language( $this->options['default_lang'] );
222
223	if ( isset( $this->static_pages ) ) {
224	$this->static_pages->init();
225	}
226
227	$this->load_strings_translations();
228	}
229	}
230	}
231