<?php
// filters posts and terms by language, rewrites links to include the language, etc...
// used only for frontend
class Polylang_Core extends Polylang_base {
public $curlang; // current language
private $default_locale;
private $list_textdomains = array(); // all text domains
private $labels; // post types and taxonomies labels to translate
private $first_query = true;
// options often needed
private $page_for_posts;
private $page_on_front;
// used to cache results
private $posts = array();
private $translation_url = array();
private $home_urls = array();
function __construct() {
parent::__construct();
// init options often needed
$this->page_for_posts = get_option('page_for_posts');
$this->page_on_front = get_option('page_on_front');
// if no language found, choose the preferred one
add_filter('pll_get_current_language', array(&$this, 'pll_get_current_language'));
// sets the language of comment
add_action('pre_comment_on_post', array(&$this, 'pre_comment_on_post'));
// text domain management
if ($this->options['force_lang'] && get_option('permalink_structure')) {
add_action('plugins_loaded', array(&$this, 'setup_theme'), 1);
add_action('wp_loaded', array(&$this, 'add_language_filters'), 5); // after Polylang_Base::add_post_types_taxonomies
}
else {
add_filter('override_load_textdomain', array(&$this, 'mofile'), 10, 3);
add_filter('gettext', array(&$this, 'gettext'), 10, 3);
add_filter('gettext_with_context', array(&$this, 'gettext_with_context'), 10, 4);
}
add_action('init', array(&$this, 'init'));
foreach (array('wp', 'login_init', 'admin_init') as $filter) // admin_init for ajax thanks to g100g
add_action($filter, array(&$this, 'load_textdomains'), 5); // priority 5 for post types and taxonomies registered in wp hook with default priority
// filters the WordPress locale
add_filter('locale', array(&$this, 'get_locale'));
// filters posts according to the language
add_filter('pre_get_posts', array(&$this, 'pre_get_posts'), 5);
// filter sticky posts by current language
add_filter('option_sticky_posts', array(&$this, 'option_sticky_posts'));
// translates page for posts and page on front
add_filter('option_page_for_posts', array(&$this, 'translate_page'));
add_filter('option_page_on_front', array(&$this, 'translate_page'));
}
// set these filters and actions only once the current language has been defined
function add_language_filters() {
if (!$this->get_languages_list() || empty($this->curlang))
return;
// modifies the language information in rss feed (useful if WP < 3.4)
add_filter('option_rss_language', array(&$this, 'option_rss_language'));
// filters categories and post tags by language
add_filter('terms_clauses', array(&$this, 'terms_clauses'), 10, 3);
// meta in the html head section
add_action('wp_head', array(&$this, 'wp_head'));
// modifies the page link in case the front page is not in the default language
add_filter('page_link', array(&$this, 'page_link'), 10, 2);
// manages the redirection of the homepage
add_filter('redirect_canonical', array(&$this, 'redirect_canonical'), 10, 2);
// adds javascript at the end of the document
if (!$GLOBALS['wp_rewrite']->using_permalinks() && (!defined('PLL_SEARCH_FORM_JS') || PLL_SEARCH_FORM_JS))
add_action('wp_footer', array(&$this, 'wp_print_footer_scripts'));
// adds the language information in the search form
// low priority in case the search form is created using the same filter as described in http://codex.wordpress.org/Function_Reference/get_search_form
add_filter('get_search_form', array(&$this, 'get_search_form'), 99);
// adds the language information in admin bar search form
remove_action('admin_bar_menu', 'wp_admin_bar_search_menu', 4);
add_action('admin_bar_menu', array(&$this, 'admin_bar_search_menu'), 4);
// filters the pages according to the current language in wp_list_pages
add_filter('wp_list_pages_excludes', array(&$this, 'wp_list_pages_excludes'));
// filters the comments according to the current language
add_filter('comments_clauses', array(&$this, 'comments_clauses'), 10, 2);
// rewrites archives, next and previous post links to filter them by language
foreach (array('getarchives', 'get_previous_post', 'get_next_post') as $filter)
foreach (array('_join', '_where') as $clause)
add_filter($filter.$clause, array(&$this, 'posts'.$clause));
// rewrites author and date links to filter them by language
foreach (array('feed_link', 'author_link', 'post_type_archive_link', 'year_link', 'month_link', 'day_link') as $filter)
add_filter($filter, array(&$this, 'archive_link'));
$this->add_post_term_link_filters(); // these filters are in base as they may be used on admin side too
// filters the nav menus according to the current language
add_filter('theme_mod_nav_menu_locations', array(&$this, 'nav_menu_locations'));
add_filter('wp_nav_menu_args', array(&$this, 'wp_nav_menu_args'));
add_filter('wp_nav_menu_items', array(&$this, 'wp_nav_menu_items'), 10, 2);
// filters the widgets according to the current language
add_filter('widget_display_callback', array(&$this, 'widget_display_callback'), 10, 3);
// strings translation (must be applied before WordPress applies its default formatting filters)
foreach (array('widget_title', 'option_blogname', 'option_blogdescription', 'option_date_format', 'option_time_format') as $filter)
add_filter($filter, 'pll__', 1);
// translates biography
add_filter('get_user_metadata', array(&$this,'get_user_metadata'), 10, 4);
// modifies the home url
if (!defined('PLL_FILTER_HOME_URL') || PLL_FILTER_HOME_URL)
add_filter('home_url', array(&$this, 'home_url'), 10, 2);
}
// returns the language according to browser preference or the default language
function get_preferred_language() {
// check first is the user was already browsing this site
if (isset($_COOKIE[PLL_COOKIE]))
return $this->get_language($_COOKIE[PLL_COOKIE]);
// compatibility with old cookie removed in 1.0
if (isset($_COOKIE['wordpress_polylang']))
return $this->get_language($_COOKIE['wordpress_polylang']);
// sets the browsing language according to the browser preferences
// code adapted from http://www.thefutureoftheweb.com/blog/use-accept-language-header
if ($this->options['browser']) {
$accept_langs = array();
if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
// break up string into pieces (languages and q factors)
preg_match_all('/([a-z]{1,8}(-[a-z]{1,8})?)\s*(;\s*q\s*=\s*(1|0\.[0-9]+))?/i', $_SERVER['HTTP_ACCEPT_LANGUAGE'], $lang_parse);
$k = $lang_parse[1];
$v = $lang_parse[4];
if ($n = count($k)) {
// set default to 1 for any without q factor
foreach ($v as $key => $val)
if ($val === '') $v[$key] = 1;
// bubble sort (need a stable sort for Android, so can't use a PHP sort function)
if ($n > 1) {
for ($i = 2; $i <= $n; $i++)
for ($j = 0; $j <= $n-2; $j++)
if ( $v[$j] < $v[$j + 1]) {
// swap values
$temp = $v[$j];
$v[$j] = $v[$j + 1];
$v[$j + 1] = $temp;
//swap keys
$temp = $k[$j];
$k[$j] = $k[$j + 1];
$k[$j + 1] = $temp;
}
}
// NOTE: array_combine => PHP5
$accept_langs = array_combine($k,$v);
}
}
// looks through sorted list and use first one that matches our language list
$listlanguages = $this->get_languages_list(array('hide_empty' => true)); // hides languages with no post
foreach (array_keys($accept_langs) as $accept_lang) {
foreach ($listlanguages as $language) {
if (stripos($accept_lang, $language->slug) === 0 && !isset($pref_lang)) {
$pref_lang = $language;
}
}
}
} // options['browser']
// allow plugin to modify the preferred language (useful for example to have a different fallback than the default language)
$slug = apply_filters('pll_preferred_language', isset($pref_lang) ? $pref_lang->slug : false);
// return default if there is no preferences in the browser or preferences does not match our languages or it is requested not to use the browser preference
return ($lang = $this->get_language($slug)) ? $lang : $this->get_language($this->options['default_lang']);
}
// returns the current language
function get_current_language() {
if ($this->curlang)
return $this->curlang;
// no language set for 404
if (is_404() || current_filter() == 'login_init')
return $this->get_preferred_language();
if ($var = get_query_var('lang'))
$lang = $this->get_language(reset(explode(',',$var))); // choose the first queried language
// Ajax thanks to g100g
elseif (isset($_REQUEST['pll_load_front']))
$lang = empty($_REQUEST['lang']) ? $this->get_preferred_language() : $this->get_language($_REQUEST['lang']);
elseif ((is_single() || is_page() || (is_attachment() && $this->options['media_support'])) && ( ($var = get_queried_object_id()) || ($var = get_query_var('p')) || ($var = get_query_var('page_id')) || ($var = get_query_var('attachment_id')) ))
$lang = $this->get_post_language($var);
elseif (isset($this->taxonomies)) {
foreach ($this->taxonomies as $taxonomy) {
if ($var = get_query_var(get_taxonomy($taxonomy)->query_var))
$lang = $this->get_term_language($var, $taxonomy);
}
}
// allows plugins to set the language
return apply_filters('pll_get_current_language', isset($lang) ? $lang : false);
}
// if no language found, return the preferred one
function pll_get_current_language($lang) {
return !$lang ? $this->get_preferred_language() : $lang;
}
// sets the language of comment
function pre_comment_on_post($post_id) {
$this->curlang = $this->get_post_language($post_id);
add_filter('page_link', array(&$this, 'page_link'), 10, 2); // useful when posting a comment on static front page in non default language
$this->add_post_term_link_filters(); // useful to redirect to correct post comment url when adding the language to all url
}
// sets the language when it is always included in the url
function setup_theme() {
// this function was hooked to setup_theme with priority 5 (after Polylang::init)
// has been moved to plugins_loaded, 1 due to WPSEO and to be consistent with WPML
// but $wp_rewrite is not defined yet, so let register our taxonomy partially
$using_permalinks = get_option('permalink_structure');
$index = 'index.php'; // $wp_rewrite->index is hardcoded in wp-includes/rewrite.php
register_taxonomy('language', null , array('label' => false, 'query_var'=>'lang', 'rewrite'=>false));
if (!$languages_list = $this->get_languages_list())
return;
// special case for ajax request
if (isset($_REQUEST['pll_load_front']))
$this->curlang = empty($_REQUEST['lang']) ? $this->get_preferred_language() : $this->get_language($_REQUEST['lang']);
// standard case
else {
foreach ($languages_list as $language)
$languages[] = $language->slug;
$root = $this->options['rewrite'] ? '' : 'language/';
$languages = $using_permalinks ? '#\/'.$root.'('.implode('|', $languages).')\/#' : '#lang=('.implode('|', $languages).')#';
preg_match($languages, trailingslashit($_SERVER['REQUEST_URI']), $matches);
// home is resquested
// some PHP setups turn requests for / into /index.php in REQUEST_URI
// thanks to Gonçalo Peres for pointing out the issue with queries unknown to WP
// http://wordpress.org/support/topic/plugin-polylang-language-homepage-redirection-problem-and-solution-but-incomplete?replies=4#post-2729566
if (str_replace('www.', '', home_url('/')) == trailingslashit((is_ssl() ? 'https://' : 'http://').str_replace('www.', '', $_SERVER['HTTP_HOST']).str_replace(array($index, '?'.$_SERVER['QUERY_STRING']), array('', ''), $_SERVER['REQUEST_URI']))) {
// take care to post & page preview http://wordpress.org/support/topic/static-frontpage-url-parameter-url-language-information
if (isset($_GET['preview']) && ( (isset($_GET['p']) && $id = $_GET['p']) || (isset($_GET['page_id']) && $id = $_GET['page_id']) ))
$this->curlang = ($lg = $this->get_post_language($id)) ? $lg : $this->get_language($this->options['default_lang']);
// take care to (unattached) attachments
elseif (isset($_GET['attachment_id']) && $id = $_GET['attachment_id'])
$this->curlang = ($lg = $this->get_post_language($id)) ? $lg : $this->get_preferred_language();
else
$this->home_requested();
}
// $matches[1] is the slug of the requested language
elseif ($matches)
$this->curlang = $this->get_language($matches[1]);
// first test for wp-login, wp-signup, wp-activate
// stripos for case insensitive file systems
elseif (false === stripos($_SERVER['SCRIPT_NAME'], $index) || !$this->options['hide_default'])
$this->curlang = $this->get_preferred_language();
else
$this->curlang = $this->get_language($this->options['default_lang']);
if ($using_permalinks)
add_action('wp', array(&$this, 'check_language_code_in_url')); // before Wordpress redirect_canonical
}
$GLOBALS['text_direction'] = get_metadata('term', $this->curlang->term_id, '_rtl', true) ? 'rtl' : 'ltr';
$GLOBALS['l10n']['pll_string'] = $this->mo_import($this->curlang);
do_action('pll_language_defined');
}
// save the default locale before we start any language manipulation
function init() {
$this->default_locale = get_locale();
}
// returns the locale based on current language
function get_locale($locale) {
return $this->curlang ? $this->curlang->description : $locale;
}
// modifies the language information in rss feed
function option_rss_language($value) {
return get_bloginfo_rss('language');
}
// saves all text domains in a table for later usage
function mofile($bool, $domain, $mofile) {
$this->list_textdomains[] = array ('mo' => $mofile, 'domain' => $domain);
return true; // prevents WP loading text domains as we will load them all later
}
// saves post types and taxonomies labels for a later usage
function gettext($translation, $text, $domain) {
$this->labels[$text] = array('domain' => $domain);
return $translation;
}
// saves post types and taxonomies labels for a later usage
function gettext_with_context($translation, $text, $context, $domain) {
$this->labels[$text] = array('domain' => $domain, 'context' => $context);
return $translation;
}
// translates post types and taxonomies labels once the language is known
function translate_labels($type) {
foreach($type->labels as $key=>$label)
if (is_string($label) && isset($this->labels[$label]))
$type->labels->$key = isset($this->labels[$label]['context']) ?
_x($label, $this->labels[$label]['context'], $this->labels[$label]['domain']) :
__($label, $this->labels[$label]['domain']);
}
// NOTE: I believe there are two ways for a plugin to force the WP language
// as done by xili_language: load text domains and reinitialize wp_locale with the action 'wp'
// as done by qtranslate: define the locale with the action 'plugins_loaded', but in this case, the language must be specified in the url.
function load_textdomains() {
// our override_load_textdomain filter has done its job. let's remove it before calling load_textdomain
remove_filter('override_load_textdomain', array(&$this, 'mofile'));
remove_filter('gettext', array(&$this, 'gettext'), 10, 3);
remove_filter('gettext_with_context', array(&$this, 'gettext_with_context'), 10, 4);
// check there is at least one language defined and sets the current language
if ($this->get_languages_list() && $this->curlang = $this->get_current_language()) {
// since 1.0: suppress old cookie which conflicts with quick cache
if (!headers_sent() && isset($_COOKIE['wordpress_polylang']))
setcookie('wordpress_polylang', '', time() - 3600, COOKIEPATH, COOKIE_DOMAIN);
// set a cookie to remember the language. check headers have not been sent to avoid ugly error
// possibility to set PLL_COOKIE to false will disable cookie although it will break some functionalities
if (!headers_sent() && PLL_COOKIE !== false && (!isset($_COOKIE[PLL_COOKIE]) || $_COOKIE[PLL_COOKIE] != $this->curlang->slug))
setcookie(PLL_COOKIE, $this->curlang->slug, time() + 31536000 /* 1 year */, COOKIEPATH, COOKIE_DOMAIN);
if (!($this->options['force_lang'] && $GLOBALS['wp_rewrite']->using_permalinks())) {
// set all our language filters and actions
$this->add_language_filters();
// now we can load text domains with the right language
$new_locale = get_locale();
foreach ($this->list_textdomains as $textdomain) {
$mo = str_replace("{$this->default_locale}.mo", "{$new_locale}.mo", $textdomain['mo']);
// since WP3.5 themes may store languages files in /wp-content/languages/themes
$mo = file_exists($mo) ? $mo : WP_LANG_DIR . "/themes/{$textdomain['domain']}-{$new_locale}.mo";
load_textdomain($textdomain['domain'], $mo);
}
// reinitializes wp_locale for weekdays and months, as well as for text direction
unset($GLOBALS['wp_locale']);
$GLOBALS['wp_locale'] = new WP_Locale();
$GLOBALS['wp_locale']->text_direction = get_metadata('term', $this->curlang->term_id, '_rtl', true) ? 'rtl' : 'ltr';
// translate labels of post types and taxonomies
foreach ($GLOBALS['wp_taxonomies'] as $tax)
$this->translate_labels($tax);
foreach ($GLOBALS['wp_post_types'] as $pt)
$this->translate_labels($pt);
// and finally load user defined strings
$GLOBALS['l10n']['pll_string'] = $this->mo_import($this->curlang);
do_action('pll_language_defined');
}
}
else {
// can't work so load the text domains with WordPress default language
foreach ($this->list_textdomains as $textdomain)
load_textdomain($textdomain['domain'], $textdomain['mo']);
}
// free memory
unset($this->list_textdomains);
unset($this->labels);
}
// special actions when home page is requested
function home_requested($query = false) {
$using_permalinks = get_option('permalink_structure'); // can't use $wp_rewrite if called early
// need this filter to get the right url when adding language code to all urls
if ($this->options['force_lang'] && $using_permalinks)
add_filter('_get_page_link', array(&$this, 'post_link'), 10, 2);
// FIXME cookie wordpress_polylang removed since 1.0
// test referer in case PLL_COOKIE is set to false
// thanks to Ov3rfly http://wordpress.org/support/topic/enhance-feature-when-front-page-is-visited-set-language-according-to-browser
$this->curlang = $this->options['hide_default'] && ((isset($_SERVER['HTTP_REFERER']) && strpos($_SERVER['HTTP_REFERER'], $this->home) !== false)) ?
$this->get_language($this->options['default_lang']) :
$this->get_preferred_language(); // sets the language according to browser preference or default language
if ($query)
$this->_home_requested($query);
else
add_action('setup_theme', array(&$this, '_home_requested')); // delays actions which need $wp_query & $wp_rewrite
}
// sets the correct query var for home page
// optionally redirects to the home page in the preferred language
function _home_requested($query = false) {
// we are already on the right page
if ($this->options['default_lang'] == $this->curlang->slug && $this->options['hide_default']) {
if ($this->page_on_front && $link_id = $this->get_post($this->page_on_front, $this->curlang))
$query ? $query->set('page_id', $link_id) : set_query_var('page_id', $link_id);
else
$query ? $query->set('lang', $this->curlang->slug) : set_query_var('lang', $this->curlang->slug);
}
// redirect to the home page in the right language
// test to avoid crash if get_home_url returns something wrong
// FIXME why this happens? http://wordpress.org/support/topic/polylang-crashes-1
// don't redirect if $_POST is not empty as it could break other plugins
// don't forget the query string which may be added by plugins
elseif (is_string($redirect = $this->get_home_url($this->curlang)) && empty($_POST)) {
wp_redirect(empty($_SERVER['QUERY_STRING']) ? $redirect : $redirect . ($wp_rewrite->using_permalinks() ? '?' : '&') . $_SERVER['QUERY_STRING']);
exit;
}
}
// filters posts according to the language
function pre_get_posts($query) {
// don't make anything if no language has been defined yet
// $this->post_types & $this->taxonomies are defined only once the action 'wp_loaded' has been fired
// don't honor suppress_filters as it breaks adjacent_image_link when post_parent == 0
if (!$this->get_languages_list() || !did_action('wp_loaded'))
return;
$qv = $query->query_vars;
// do not filter if lang is set to an empty value
if (isset($qv['lang']) && !$qv['lang'])
return;
// users may want to display content in a different language than the current one by setting it explicitely in the query
if (!$this->first_query && $this->curlang && !empty($qv['lang']))
return;
$is_post_type = isset($qv['post_type']) && (
in_array($qv['post_type'], $this->post_types) ||
(is_array($qv['post_type']) && array_intersect($qv['post_type'], $this->post_types))
);
// don't filters post types not in our list
if (isset($qv['post_type']) && !$is_post_type)
return;
global $wp_rewrite;
$this->first_query = false;
// special case for wp-signup.php & wp-activate.php
// stripos for case insensitive file systems
if (false === stripos($_SERVER['SCRIPT_NAME'], $wp_rewrite->index)) {
$this->curlang = $this->get_preferred_language();
return;
}
// homepage is requested, let's set the language
// take care to avoid posts page for which is_home = 1
if (!$this->curlang && empty($query->query) && (is_home() || (is_page() && $qv['page_id'] == $this->page_on_front)))
$this->home_requested($query);
// redirect the language page to the homepage
if ($this->options['redirect_lang'] && is_tax('language') && $this->page_on_front && (count($query->query) == 1 || (is_paged() && count($query->query) == 2))) {
$this->curlang = $this->get_language(get_query_var('lang'));
if ($page_id = $this->get_post($this->page_on_front, $this->get_language(get_query_var('lang')))) {
$query->set('page_id', $page_id);
$query->is_singular = $query->is_page = true;
$query->is_archive = $query->is_tax = false;
unset($query->queried_object); // reset queried object
return;
}
// else : the static front page is not translated
// let's things as is and the list of posts in the current language will be displayed
}
// sets is_home on translated home page when it displays posts
// is_home must be true on page 2, 3... too
if (!$this->page_on_front && is_tax('language') && (count($query->query) == 1 || (is_paged() && count($query->query) == 2))) {
$this->curlang = $this->get_language(get_query_var('lang')); // sets the language now otherwise it will be too late to filter sticky posts !
$query->is_home = true;
$query->is_archive = $query->is_tax = false;
}
// sets the language for posts page in case the front page displays a static page
if ($this->page_for_posts) {
// If permalinks are used, WordPress does set and use $query->queried_object_id and sets $query->query_vars['page_id'] to 0
// and does set and use $query->query_vars['page_id'] if permalinks are not used :(
if (!empty($qv['pagename']) && isset($query->queried_object_id))
$page_id = $query->queried_object_id;
elseif (isset($qv['page_id']))
$page_id = $qv['page_id'];
if (!empty($page_id) && $this->get_post($page_id, $this->get_post_language($this->page_for_posts)) == $this->page_for_posts) {
$this->page_for_posts = $page_id;
$this->curlang = $this->get_post_language($page_id);
$query->set('lang', $this->curlang->slug);
$query->is_singular = $query->is_page = false;
$query->is_home = $query->is_posts_page = true;
}
}
// FIXME to generalize as I probably forget things
$is_archive = (count($query->query) == 1 && !empty($qv['paged'])) ||
!empty($qv['m']) || !empty($qv['year']) || // need to test year due to post rewrite rule conflict when using date and name permalinks
!empty($qv['author']) ||
(isset($qv['post_type']) && is_post_type_archive() && $is_post_type);
// sets 404 when the language is not set for archives needing the language in the url
if (!$this->options['hide_default'] && !isset($qv['lang']) && !$wp_rewrite->using_permalinks() && $is_archive)
$query->set_404();
// sets the language in case we hide the default language
if ($this->options['hide_default'] && !isset($qv['lang']) && ($is_archive || $query->is_search || (count($query->query) == 1 && !empty($qv['feed'])) ))
$query->set('lang', $this->options['default_lang']);
// allow filtering recent posts and secondary queries by the current language
// take care not to break queries for non visible post types such as nav_menu_items, attachments...
if (/*$query->is_home && */$this->curlang && (!isset($qv['post_type']) || $is_post_type ))
$query->set('lang', $this->curlang->slug);
// remove pages query when the language is set unless we do a search
// FIXME is only search broken by this ?
if (!empty($qv['lang']) && !isset($qv['post_type']) && !is_search())
$query->set('post_type', 'post');
// unset the is_archive flag for language pages to prevent loading the archive template
// keep archive flag for comment feed otherwise the language filter does not work
if (!empty($qv['lang']) && !is_comment_feed() &&
!is_post_type_archive() && !is_date() && !is_author() && !is_category() && !is_tag() && !is_tax('post_format'))
$query->is_archive = false;
// unset the is_tax flag for authors pages and post types archives
// FIXME Probably I should do this for other cases
if (!empty($qv['lang']) && (is_author() || is_post_type_archive() || is_date() || is_search())) {
$query->is_tax = false;
unset($query->queried_object);
}
// sets a language for theme preview
if (is_preview() && is_front_page()) {
$this->curlang = $this->get_current_language();
$query->set('lang', $this->curlang->slug);
}
// sets the language for an empty string search when hiding the code for default language
// http://wordpress.org/support/topic/search-for-empty-string-in-default-language
if (!$this->curlang && !get_query_var('lang') && $this->options['hide_default'] && isset($query->query['s']) && !$query->query['s'])
$query->set('lang', $this->options['default_lang']);
// to avoid conflict beetwen taxonomies
if (isset($query->tax_query->queries))
foreach ($query->tax_query->queries as $tax)
if (in_array($tax['taxonomy'], $this->taxonomies))
unset($query->query_vars['lang']);
}
// filter sticky posts by current language
function option_sticky_posts($posts) {
if ($this->curlang && !empty($posts)) {
foreach ($posts as $key=>$post_id) {
if ($this->get_post_language($post_id)->term_id != $this->curlang->term_id)
unset($posts[$key]);
}
}
return $posts;
}
// filters categories and post tags by language when needed
function terms_clauses($clauses, $taxonomies, $args) {
// does nothing except on taxonomies which are filterable
foreach ($taxonomies as $tax) {
if (!in_array($tax, $this->taxonomies))
return $clauses;
}
// adds our clauses to filter by language
return $this->_terms_clauses($clauses, isset($args['lang']) ? $args['lang'] : $this->curlang);
}
// meta in the html head section
function wp_head() {
// outputs references to translated pages (if exists) in the html head section
foreach ($this->get_languages_list() as $language) {
if ($language->slug != $this->curlang->slug && $url = $this->get_translation_url($language))
printf("<link hreflang='%s' href='%s' rel='alternate' />\n", esc_attr($language->slug), esc_url($url));
}
}
// modifies the page link in case the front page is not in the default language
function page_link($link, $id) {
if ($this->options['redirect_lang'] && $this->page_on_front && $lang = $this->get_post_language($id)) {
if (!isset($this->posts[$lang->slug][$this->page_on_front]))
$this->posts[$lang->slug][$this->page_on_front] = $this->get_post($this->page_on_front, $lang);
if ($id == $this->posts[$lang->slug][$this->page_on_front])
return $this->options['hide_default'] && $lang->slug == $this->options['default_lang'] ? trailingslashit($this->home) : get_term_link($lang, 'language');
}
if ($this->page_on_front && $this->options['hide_default']) {
if (!isset($this->posts[$this->options['default_lang']][$this->page_on_front]))
$this->posts[$this->options['default_lang']][$this->page_on_front] = $this->get_post($this->page_on_front, $this->options['default_lang']);
if ($id == $this->posts[$this->options['default_lang']][$this->page_on_front])
return trailingslashit($this->home);
}
return _get_page_link($id);
}
// manages canonical redirection of the homepage when using page on front
function redirect_canonical($redirect_url, $requested_url) {
global $wp_query;
if (is_page() && !is_feed() && isset($wp_query->queried_object) && 'page' == get_option('show_on_front') && $wp_query->queried_object->ID == get_option('page_on_front'))
return $this->options['redirect_lang'] ? $this->get_home_url() : false;
return $redirect_url;
}
// redirects incoming links to the proper URL when adding the language code to all urls
function check_language_code_in_url() {
if (is_single() || is_page()) {
global $post;
if (isset($post->ID) && in_array($post->post_type, $this->post_types))
$language = $this->get_post_language((int)$post->ID);
}
elseif (is_category() || is_tag() || is_tax()) {
$obj = $GLOBALS['wp_query']->get_queried_object();
if (in_array($obj->taxonomy, $this->taxonomies))
$language = $this->get_term_language((int)$obj->term_id);
}
// the language is not correctly set so let's redirect to the correct url for this object
if (isset($language) && $language->slug != $this->curlang->slug) {
$root = $this->options['rewrite'] ? '/' : '/language/';
foreach ($this->get_languages_list() as $lang)
$languages[] = $root . $lang->slug;
$requested_url = (is_ssl() ? 'https://' : 'http://') . $_SERVER['HTTP_HOST'] . str_replace($languages, '', $_SERVER['REQUEST_URI']);
$redirect_url = $this->add_language_to_link($requested_url, $language);
wp_redirect($redirect_url, 301);
exit;
}
}
// adds some javascript workaround knowing it's not perfect...
function wp_print_footer_scripts() {
// modifies the search form since filtering get_search_form won't work if the template uses searchform.php or the search form is hardcoded
// don't use directly e[0] just in case there is somewhere else an element named 's'
// check before if the hidden input has not already been introduced by get_search_form (FIXME: is there a way to improve this ?
// thanks to AndyDeGroo for improving the code for compatility with old browsers
// http://wordpress.org/support/topic/development-of-polylang-version-08?replies=6#post-2645559
$lang = esc_js($this->curlang->slug);
$js = "//<![CDATA[
e = document.getElementsByName('s');
for (i = 0; i < e.length; i++) {
if (e[i].tagName.toUpperCase() == 'INPUT') {
s = e[i].parentNode.parentNode.children;
l = 0;
for (j = 0; j < s.length; j++) {
if (s[j].name == 'lang') {
l = 1;
}
}
if ( l == 0) {
var ih = document.createElement('input');
ih.type = 'hidden';
ih.name = 'lang';
ih.value = '$lang';
e[i].parentNode.appendChild(ih);
}
}
}
//]]>";
echo "<script type='text/javascript'>" .$js. "</script>";
}
// adds the language information in the search form
// does not work if searchform.php is used or if the search form is hardcoded in another template file
function get_search_form($form) {
if ($form)
$form = $GLOBALS['wp_rewrite']->using_permalinks() ?
str_replace(trailingslashit($this->home), $this->get_home_url($this->curlang, true), $form) :
str_replace('</form>', '<input type="hidden" name="lang" value="'.esc_attr($this->curlang->slug).'" /></form>', $form);
return $form;
}
// rewrites the admin bar search form to include the language
function admin_bar_search_menu($wp_admin_bar) {
global $wp_rewrite;
$title = sprintf('
<form action="%s" method="get" id="adminbarsearch">
<input class="adminbar-input" name="s" id="adminbar-search" tabindex="10" type="text" value="" maxlength="150" />
<input type="submit" class="adminbar-button" value="%s"/>
%s
</form>',
$wp_rewrite->using_permalinks() ? $this->get_home_url($this->curlang, true) : esc_url($this->home),
__('Search'),
$wp_rewrite->using_permalinks() ? '' : sprintf('<input type="hidden" name="lang" value="%s" />', esc_attr($this->curlang->slug))
);
$wp_admin_bar->add_menu(array(
'parent' => 'top-secondary',
'id' => 'search',
'title' => $title,
'meta' => array('class' => 'admin-bar-search', 'tabindex' => -1)
));
}
// excludes pages which are not in the current language for wp_list_pages
// useful for the pages widget
function wp_list_pages_excludes($pages) {
return array_merge($pages, $this->exclude_pages($this->curlang->term_id));
}
// filters the comments according to the current language mainly for the recent comments widget
function comments_clauses($clauses, $query) {
return $this->_comments_clauses($clauses, isset($query->query_vars['lang']) ? $query->query_vars['lang'] : $this->curlang);
}
// modifies the sql request for wp_get_archives an get_adjacent_post to filter by the current language
function posts_join($sql) {
global $wpdb;
return $sql . " INNER JOIN $wpdb->term_relationships AS pll_tr ON pll_tr.object_id = ID";
}
// modifies the sql request for wp_get_archives and get_adjacent_post to filter by the current language
function posts_where($sql) {
global $wpdb;
preg_match("#post_type = '([^']+)'#", $sql, $matches); // find the queried post type
return !empty($matches[1]) && in_array($matches[1], $this->post_types) ? $sql . $wpdb->prepare(" AND pll_tr.term_taxonomy_id IN (%s)", $this->curlang->term_taxonomy_id) : $sql;
}
// modifies the author and date links to add the language parameter (as well as feed link)
function archive_link($link) {
return $this->add_language_to_link($link, $this->curlang);
}
// returns the url of the translation (if exists) of the current page
function get_translation_url($language) {
if (isset($this->translation_url[$language->slug]))
return $this->translation_url[$language->slug];
global $wp_query, $wp_rewrite;
$qv = $wp_query->query;
$hide = $this->options['default_lang'] == $language->slug && $this->options['hide_default'];
// post and attachment
if (is_single() && ($this->options['media_support'] || !is_attachment()) && $id = $this->get_post($wp_query->queried_object_id, $language))
$url = get_permalink($id);
// page for posts
elseif (get_option('show_on_front') == 'page' && !empty($wp_query->queried_object_id) && $wp_query->queried_object_id == $this->page_for_posts && ($id = $this->get_post($this->page_for_posts, $language)))
$url = get_permalink($id);
elseif (is_page() && $id = $this->get_post($wp_query->queried_object_id, $language))
$url = $hide && $id == $this->get_post($this->page_on_front, $language) ? $this->home : get_page_link($id);
elseif (!is_tax('post_format') && !is_tax('language') && (is_category() || is_tag() || is_tax()) ) {
$term = get_queried_object();
$lang = $this->get_term_language($term->term_id);
if (!$lang || $language->slug == $lang->slug)
$url = get_term_link($term, $term->taxonomy); // self link
elseif ($link_id = $this->get_translation('term', $term->term_id, $language))
$url = get_term_link(get_term($link_id, $term->taxonomy), $term->taxonomy);
}
// don't test if there are existing translations before creating the url as it would be very expensive in sql queries
elseif (is_archive()) {
if ($wp_rewrite->using_permalinks()) {
$filters = array('author_link', 'post_type_archive_link', 'year_link', 'month_link', 'day_link');
// prevents filtering links by current language
remove_filter('term_link', array(&$this, 'term_link')); // for post format
foreach ($filters as $filter)
remove_filter($filter, array(&$this, 'archive_link'));
if (is_author())
$url = $this->add_language_to_link(get_author_posts_url(0, $qv['author_name']), $language);
elseif (is_year())
$url = $this->add_language_to_link(get_year_link($qv['year']), $language);
elseif (is_month())
$url = $this->add_language_to_link(get_month_link($qv['year'], $qv['monthnum']), $language);
elseif (is_day())
$url = $this->add_language_to_link(get_day_link($qv['year'], $qv['monthnum'], $qv['day']), $language);
elseif (is_post_type_archive())
$url = $this->add_language_to_link(get_post_type_archive_link($qv['post_type']), $language);
elseif (is_tax('post_format'))
$url = $this->add_language_to_link(get_post_format_link($qv['post_format']), $language);
// put our language filters again
add_filter('term_link', array(&$this, 'term_link'), 10, 3);
foreach ($filters as $filter)
add_filter($filter, array(&$this, 'archive_link'));
}
else {
$url = $hide ? remove_query_arg('lang') : add_query_arg('lang', $language->slug);
$url = remove_query_arg('paged', $url);
}
}
elseif (is_search()) {
if ($wp_rewrite->using_permalinks())
$url = $this->add_language_to_link($this->home.'/?'.$_SERVER['QUERY_STRING'], $language);
else {
$url = add_query_arg('lang', $language->slug);
$url = remove_query_arg('paged', $url);
}
}
elseif (is_home() || is_tax('language') )
$url = $this->get_home_url($language);
return $this->translation_url[$language->slug] = (isset($url) && !is_wp_error($url) ? $url : null);
}
// filters the nav menus according to the current language when called from get_nav_menu_locations()
// mainly for Artisteer generated themes and themes which test has_nav_menu
function nav_menu_locations($menus) {
$menu_lang = get_option('polylang_nav_menus');
foreach(array_keys(get_registered_nav_menus()) as $location) {
if (isset($menu_lang[$location][$this->curlang->slug]))
$menus[$location] = $menu_lang[$location][$this->curlang->slug];
}
return $menus;
}
// filters the nav menus according to the current language when called from wp_nav_menus
function wp_nav_menu_args($args) {
$menu_lang = get_option('polylang_nav_menus');
/* FIXME breaks more than it solves
// attempt to find a theme location if the theme registered one but calls wp_nav_menu only with a harcoded menu
if (!$args['theme_location'] && $args['menu']) {
$menu = wp_get_nav_menu_object($args['menu']);
foreach ($this->get_languages_list() as $language)
foreach ($menu_lang as $location => $arr)
if (isset($arr[$language->slug]) && $arr[$language->slug] == $menu->term_id)
$args['theme_location'] = $location;
}
// attempt to find a theme location if the theme registered one (only one!) but calls wp_nav_menu without it
if (!$args['theme_location'] && ($menus = get_registered_nav_menus()) && count($menus) == 1)
$args['theme_location'] = key($menus);
*/
if ($args['theme_location'] && isset($menu_lang[$args['theme_location']][$this->curlang->slug]))
$args['menu'] = $menu_lang[$args['theme_location']][$this->curlang->slug];
return $args;
}
// adds the language switcher at the end of the menu
function wp_nav_menu_items($items, $args) {
$menu_lang = get_option('polylang_nav_menus');
return isset($args->theme_location) && isset($menu_lang[$args->theme_location]['switcher']) && $menu_lang[$args->theme_location]['switcher'] ?
$items . $this->the_languages(array_merge($menu_lang[$args->theme_location], array('menu' => 1, 'echo' => 0))) : $items;
}
// filters the widgets according to the current language
function widget_display_callback($instance, $widget, $args) {
$widget_lang = get_option('polylang_widgets');
// don't display if a language filter is set and this is not the current one
return !empty($widget_lang[$widget->id]) && $widget_lang[$widget->id] != $this->curlang->slug ? false : $instance;
}
// translates biography
function get_user_metadata($null, $id, $meta_key, $single) {
return $meta_key == 'description' ? get_user_meta($id, 'description_'.$this->curlang->slug, true) : $null;
}
// translates page for posts and page on front
function translate_page($v) {
// returns the current page if there is no translation to avoid ugly notices
// the fonction is often called so let's store the result
return isset($this->curlang) && $v && (isset($this->posts[$v]) || $this->posts[$v] = $this->get_post($v, $this->curlang)) ? $this->posts[$v] : $v;
}
// filters the home url to get the right language
function home_url($url, $path) {
if (!(did_action('template_redirect') || did_action('login_init')) || rtrim($url,'/') != $this->home)
return $url;
$theme = get_theme_root();
$is_get_search_form = false;
// FIXME can I decrease the size of the array to improve speed?
foreach (array_reverse(debug_backtrace(/*!DEBUG_BACKTRACE_PROVIDE_OBJECT|DEBUG_BACKTRACE_IGNORE_ARGS*/)) as $trace) {
// search form
if (isset($trace['file']) && strpos($trace['file'], 'searchform.php'))
return $GLOBALS['wp_rewrite']->using_permalinks() ? $this->get_home_url($this->curlang, true) : $url;
// don't interfere with get_search_form filter which I prefer to use when possible
if ($trace['function'] == 'get_search_form')
$is_get_search_form = true;
if ($trace['function'] == 'wp_nav_menu' || $trace['function'] == 'login_footer' ||
// direct call from the theme
( !$is_get_search_form && isset($trace['file']) && strpos($trace['file'], $theme) !== false && in_array($trace['function'], array('home_url', 'get_home_url', 'bloginfo', 'get_bloginfo')) ))
// remove trailing slash if there is none in requested url
return empty($path) ? rtrim($this->get_home_url($this->curlang), '/') : $this->get_home_url($this->curlang);
}
return $url;
}
// returns the home url in the right language
function get_home_url($language = '', $is_search = false) {
if ($language == '')
$language = $this->curlang;
if (isset($this->home_urls[$language->slug][$is_search]))
return $this->home_urls[$language->slug][$is_search];
if ($this->options['default_lang'] == $language->slug && $this->options['hide_default'])
return $this->home_urls[$language->slug][$is_search] = trailingslashit($this->home);
// a static page is used as front page : /!\ don't use get_page_link to avoid infinite loop
// don't use this for search form
if (!$is_search && $this->page_on_front && $id = $this->get_post($this->page_on_front, $language))
return $this->home_urls[$language->slug][$is_search] = $this->page_link('', $id);
$link = get_term_link($language, 'language');
// add a trailing slash as done by WP on homepage (otherwise could break the search form when the permalink structure does not include one)
// only for pretty permalinks
return $this->home_urls[$language->slug][$is_search] = $GLOBALS['wp_rewrite']->using_permalinks() ? trailingslashit($link) : $link;
}
// displays (or returns) the language switcher
function the_languages($args = '') {
$defaults = array(
'dropdown' => 0, // display as list and not as dropdown
'echo' => 1, // echoes the list
'hide_if_empty' => 1, // hides languages with no posts (or pages)
'menu' => 0, // not for nav menu
'show_flags' => 0, // don't show flags
'show_names' => 1, // show language names
'display_names_as' => 'name', // valid options are slug and name
'force_home' => 0, // tries to find a translation
'hide_if_no_translation' => 0, // don't hide the link if there is no translation
'hide_current' => 0, // don't hide current language
'post_id' => null, // if not null, link to translations of post defined by post_id
);
extract(wp_parse_args($args, $defaults));
if ($dropdown)
$output = $this->dropdown_languages(array('hide_empty' => $hide_if_empty, 'selected' => $this->curlang->slug));
else {
$output = '';
foreach ($this->get_languages_list(array('hide_empty' => $hide_if_empty)) as $language) {
// hide current language
if ($this->curlang->term_id == $language->term_id && $hide_current)
continue;
$url = $post_id !== null && ($tr_id = $this->get_post($post_id, $language)) ? get_permalink($tr_id) :
$post_id === null && !$force_home ? $this->get_translation_url($language) : null;
$class = isset($url) ? '' : 'no-translation ';
$url = apply_filters('pll_the_language_link', $url, $language->slug, $language->description);
// hide if no translation exists
if (!isset($url) && $hide_if_no_translation)
continue;
$url = isset($url) ? $url : $this->get_home_url($language); // if the page is not translated, link to the home page
$class .= sprintf('lang-item lang-item-%d lang-item-%s', esc_attr($language->term_id), esc_attr($language->slug));
$class .= $language->term_id == $this->curlang->term_id ? ' current-lang' : '';
$class .= $menu ? ' menu-item' : '';
$flag = $show_flags ? $this->get_flag($language) : '';
$name = $show_names || !$show_flags ? esc_html($display_names_as == 'slug' ? $language->slug : $language->name) : '';
$output .= sprintf("<li class='%s'><a hreflang='%s' href='%s'>%s</a></li>\n",
$class,
esc_attr($language->slug),
esc_url($url),
$show_flags && $show_names ? $flag.' '.$name : $flag.$name
);
}
}
$output = apply_filters('pll_the_languages', $output, $args);
if(!$echo)
return $output;
echo $output;
}
}