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<?php
/**
* @package Polylang
*/
/**
* A class to manipulate the language query var in WP_Query
*
* @since 2.2
*/
class PLL_Query {
/**
* @var PLL_Model
*/
public $model;
/**
* @var WP_Query
*/
public $query;
/**
* Constructor
*
* @since 2.2
*
* @param WP_Query $query Reference to the WP_Query object.
* @param PLL_Model $model Instance of PLL_Model.
*/
public function __construct( &$query, &$model ) {
$this->query = &$query;
$this->model = &$model;
}
/**
* Checks if the query already includes a language taxonomy.
*
* @since 3.0
*
* @param array $qvars WP_Query query vars.
* @return bool
*/
protected function is_already_filtered( $qvars ) {
if ( isset( $qvars['lang'] ) ) {
return true;
}
if ( ! empty( $qvars['tax_query'] ) && is_array( $qvars['tax_query'] ) ) {
foreach ( $qvars['tax_query'] as $tax_query ) {
if ( isset( $tax_query['taxonomy'] ) && 'language' === $tax_query['taxonomy'] ) {
return true;
}
}
}
return false;
}
/**
* Check if translated taxonomy is queried
* Compatible with nested queries introduced in WP 4.1
*
* @see https://wordpress.org/support/topic/tax_query-bug
*
* @since 1.7
*
* @param array $tax_queries An array of tax queries.
* @return bool
*/
protected function have_translated_taxonomy( $tax_queries ) {
if ( is_array( $tax_queries ) ) {
foreach ( $tax_queries as $tax_query ) {
if ( isset( $tax_query['taxonomy'] ) && $this->model->is_translated_taxonomy( $tax_query['taxonomy'] ) && ! ( isset( $tax_query['operator'] ) && 'NOT IN' === $tax_query['operator'] ) ) {
return true;
}
// Nested queries
elseif ( is_array( $tax_query ) && $this->have_translated_taxonomy( $tax_query ) ) {
return true;
}
}
}
return false;
}
/**
* Get queried taxonomies
*
* @since 2.2
*
* @return array queried taxonomies
*/
public function get_queried_taxonomies() {
return ! empty( $this->query->tax_query->queried_terms ) ? array_keys( wp_list_filter( $this->query->tax_query->queried_terms, array( 'operator' => 'NOT IN' ), 'NOT' ) ) : array();
}
/**
* Sets the language in query.
* Optimized for (and requires) WP 3.5+.
*
* @since 2.2
* @since 3.3 Accepts now an array of languages.
*
* @param PLL_Language|PLL_Language[] $languages Language object(s).
* @return void
*/
public function set_language( $languages ) {
if ( ! is_array( $languages ) ) {
$languages = array( $languages );
}
$tt_ids = array();
foreach ( $languages as $language ) {
$tt_ids[] = $language->get_tax_prop( 'language', 'term_taxonomy_id' );
}
// Defining directly the tax_query (rather than setting 'lang' avoids transforming the query by WP).
$lang_query = array(
'taxonomy' => 'language',
'field' => 'term_taxonomy_id', // Since WP 3.5
'terms' => $tt_ids,
'operator' => 'IN',
);
$tax_query = &$this->query->query_vars['tax_query'];
if ( isset( $tax_query['relation'] ) && 'OR' === $tax_query['relation'] ) {
$tax_query = array(
$lang_query,
$tax_query,
'relation' => 'AND',
);
} elseif ( is_array( $tax_query ) ) {
// The tax query is expected to be *always* an array, but it seems that 3rd parties fill it with a string
// Causing a fatal error if we don't check it.
// See https://wordpress.org/support/topic/fatal-error-2947/
$tax_query[] = $lang_query;
} elseif ( empty( $tax_query ) ) {
// Supposing the tax query has been wrongly filled with an empty string
$tax_query = array( $lang_query );
}
}
/**
* Adds the language in the query after it has checked that it won't conflict with other query vars.
*
* @since 2.2
*
* @param PLL_Language|false $lang Language.
* @return void
*/
public function filter_query( $lang ) {
$qvars = &$this->query->query_vars;
if ( ! $this->is_already_filtered( $qvars ) ) {
$taxonomies = array_intersect( $this->model->get_translated_taxonomies(), get_taxonomies( array( '_builtin' => false ) ) );
foreach ( $taxonomies as $tax ) {
$tax_object = get_taxonomy( $tax );
if ( ! empty( $tax_object ) && ! empty( $qvars[ $tax_object->query_var ] ) ) {
return;
}
}
if ( ! empty( $qvars['tax_query'] ) && $this->have_translated_taxonomy( $qvars['tax_query'] ) ) {
return;
}
// Filter queries according to the requested language
if ( ! empty( $lang ) ) {
$taxonomies = $this->get_queried_taxonomies();
if ( $taxonomies && ( empty( $qvars['post_type'] ) || 'any' === $qvars['post_type'] ) ) {
foreach ( $taxonomies as $taxonomy ) {
$tax_object = get_taxonomy( $taxonomy );
if ( ! empty( $tax_object ) && $this->model->is_translated_post_type( $tax_object->object_type ) ) {
$this->set_language( $lang );
break;
}
}
} elseif ( empty( $qvars['post_type'] ) || $this->model->is_translated_post_type( $qvars['post_type'] ) ) {
$this->set_language( $lang );
}
}
} else {
$this->maybe_set_language_for_or_relation();
// Do not filter untranslatable post types such as nav_menu_item
if ( isset( $qvars['post_type'] ) && ! $this->model->is_translated_post_type( $qvars['post_type'] ) && ( empty( $qvars['tax_query'] ) || ! $this->have_translated_taxonomy( $qvars['tax_query'] ) ) ) {
unset( $qvars['lang'] );
}
// Unset 'all' query var (mainly for admin language filter).
if ( isset( $qvars['lang'] ) && 'all' === $qvars['lang'] ) {
unset( $qvars['lang'] );
}
}
}
/**
* Sets the language correctly if the current query is a 'OR' relation,
* since WordPress merges the language with the other query vars when the relation is OR.
*
* @since 3.3
*
* @return void
*/
protected function maybe_set_language_for_or_relation() {
if ( ! $this->query->tax_query instanceof WP_Tax_Query ) {
return;
}
if ( 'OR' !== $this->query->tax_query->relation ) {
return;
}
if ( ! isset( $this->query->tax_query->queried_terms['language'] ) ) {
return;
}
$langs = $this->query->tax_query->queried_terms['language']['terms'];
if ( is_string( $langs ) ) {
$langs = explode( ',', $langs );
}
$langs = array_map( array( $this->model, 'get_language' ), $langs );
$langs = array_filter( $langs );
if ( ! empty( $langs ) ) {
$this->set_language( $langs );
unset( $this->query->query_vars['lang'] ); // Unset the language query var otherwise WordPress would add the language query by slug in WP_Query::parse_tax_query().
}
}
/**
* Transforms a language query by `slug` to a language query by `term_taxonomy_id`.
*
* Example:
* From: array(
* 'taxonomy' => 'language',
* 'terms' => array( 'en' ),
* 'field' => 'slug',
* 'operator' => 'IN',
* 'include_children' => 1,
* )
* To: array(
* 'taxonomy' => 'language',
* 'terms' => array( 238 ),
* 'field' => 'term_taxonomy_id',
* 'operator' => 'IN',
* 'include_children' => 1,
* )
*
* @since 3.8
*
* @return void
*/
public function transform_query(): void {
if ( empty( $this->query->tax_query ) ) {
// Null.
return;
}
foreach ( $this->query->tax_query->queries as &$tax_query ) {
if ( ! is_array( $tax_query ) || ! isset( $tax_query['taxonomy'], $tax_query['field'], $tax_query['terms'] ) ) {
// Can be a `relation` entry (string), or a sub-query.
continue;
}
if ( 'language' !== $tax_query['taxonomy'] || 'slug' !== $tax_query['field'] ) {
// Not what we're looking for.
continue;
}
$tax_query['field'] = 'term_taxonomy_id';
foreach ( $tax_query['terms'] as &$term ) {
$language = $this->model->get_language( $term );
$term = ! empty( $language ) ? $language->get_tax_prop( 'language', 'term_taxonomy_id' ) : 0;
}
}
}
}