<?php

/**

 * Taxonomy API: WP_Term_Query class.

 *

 * @package WordPress

 * @subpackage Taxonomy

 * @since 4.6.0

 */

/**

 * Class used for querying terms.

 *

 * @since 4.6.0

 *

 * @see WP_Term_Query::__construct() for accepted arguments.

 */

class WP_Term_Query {

	/**

	 * SQL string used to perform database query.

	 *

	 * @since 4.6.0

	 * @var string

	 */

	public $request;

	/**

	 * Metadata query container.

	 *

	 * @since 4.6.0

	 * @var WP_Meta_Query A meta query instance.

	 */

	public $meta_query = false;

	/**

	 * Metadata query clauses.

	 *

	 * @since 4.6.0

	 * @var array

	 */

	protected $meta_query_clauses;

	/**

	 * SQL query clauses.

	 *

	 * @since 4.6.0

	 * @var array

	 */

	protected $sql_clauses = array(

		'select'  => '',

		'from'    => '',

		'where'   => array(),

		'orderby' => '',

		'limits'  => '',

	);

	/**

	 * Query vars set by the user.

	 *

	 * @since 4.6.0

	 * @var array

	 */

	public $query_vars;

	/**

	 * Default values for query vars.

	 *

	 * @since 4.6.0

	 * @var array

	 */

	public $query_var_defaults;

	/**

	 * List of terms located by the query.

	 *

	 * @since 4.6.0

	 * @var array

	 */

	public $terms;

	/**

	 * Constructor.

	 *

	 * Sets up the term query, based on the query vars passed.

	 *

	 * @since 4.6.0

	 * @since 4.6.0 Introduced 'term_taxonomy_id' parameter.

	 * @since 4.7.0 Introduced 'object_ids' parameter.

	 * @since 4.9.0 Added 'slug__in' support for 'orderby'.

	 *

	 * @param string|array $query {

	 *     Optional. Array or query string of term query parameters. Default empty.

	 *

	 *     @type string|array $taxonomy               Taxonomy name, or array of taxonomies, to which results should

	 *                                                be limited.

	 *                                                limited to terms associated with these objects.

	 *     @type string       $orderby                Field(s) to order terms by. Accepts:

	 *                                                  'description', 'parent', 'term_order'). Unless `$object_ids`

	 *                                                  is not empty, 'term_order' is treated the same as 'term_id'.

	 *                                                Defaults to 'name'.

	 *     @type string       $order                  Whether to order terms in ascending or descending order.

	 *                                                Accepts 'ASC' (ascending) or 'DESC' (descending).

	 *                                                Default 'ASC'.

	 *     @type bool|int     $hide_empty             Whether to hide terms not assigned to any posts. Accepts

	 *                                                1|true or 0|false. Default 1|true.

	 *                                                Default empty array.

	 *                                                If $include is non-empty, $exclude is ignored.

	 *                                                Default empty array.

	 *                                                along with all of their descendant terms. If $include is

	 *                                                non-empty, $exclude_tree is ignored. Default empty array.

	 *     @type int|string   $number                 Maximum number of terms to return. Accepts ''|0 (all) or any

	 *                                                positive number. Default ''|0 (all). Note that $number may

	 *                                                not return accurate results when coupled with $object_ids.

	 *                                                See #41796 for details.

	 *     @type int          $offset                 The number by which to offset the terms query. Default empty.

	 *     @type string       $fields                 Term fields to query for. Accepts:

	 *                                                  with the 'object_id' param (`WP_Term[]`). Works only

	 *                                                  when the `$object_ids` parameter is populated.

	 *                                                   keyed by term ID (`int[]`).

	 *                                                   keyed by term ID (`string[]`).

	 *                                                   keyed by term ID (`string[]`).

	 *                                                Default 'all'.

	 *     @type bool         $count                  Whether to return a term count. If true, will take precedence

	 *                                                over `$fields`. Default false.

	 *     @type string|array $name                   Optional. Name or array of names to return term(s) for.

	 *                                                Default empty.

	 *     @type string|array $slug                   Optional. Slug or array of slugs to return term(s) for.

	 *                                                Default empty.

	 *                                                to match when querying terms.

	 *     @type bool         $hierarchical           Whether to include terms that have non-empty descendants

	 *                                                (even if $hide_empty is set to true). Default true.

	 *     @type string       $search                 Search criteria to match terms. Will be SQL-formatted with

	 *                                                wildcards before and after. Default empty.

	 *     @type string       $name__like             Retrieve terms with criteria by which a term is LIKE

	 *                                                `$name__like`. Default empty.

	 *     @type string       $description__like      Retrieve terms where the description is LIKE

	 *                                                `$description__like`. Default empty.

	 *     @type bool         $pad_counts             Whether to pad the quantity of a term's children in the

	 *                                                quantity of each term's "count" object variable.

	 *                                                Default false.

	 *     @type string       $get                    Whether to return terms regardless of ancestry or whether the

	 *                                                terms are empty. Accepts 'all' or empty (disabled).

	 *                                                Default empty.

	 *     @type int          $child_of               Term ID to retrieve child terms of. If multiple taxonomies

	 *                                                are passed, $child_of is ignored. Default 0.

	 *     @type int|string   $parent                 Parent term ID to retrieve direct-child terms of.

	 *                                                Default empty.

	 *     @type bool         $childless              True to limit results to terms that have no children.

	 *                                                This parameter has no effect on non-hierarchical taxonomies.

	 *                                                Default false.

	 *     @type string       $cache_domain           Unique cache key to be produced when this query is stored in

	 *                                                an object cache. Default is 'core'.

	 *     @type bool         $update_term_meta_cache Whether to prime meta caches for matched terms. Default true.

	 *     @type array        $meta_query             Optional. Meta query clauses to limit retrieved terms by.

	 *                                                See `WP_Meta_Query`. Default empty.

	 *     @type string       $meta_key               Limit terms to those matching a specific metadata key.

	 *                                                Can be used in conjunction with `$meta_value`. Default empty.

	 *     @type string       $meta_value             Limit terms to those matching a specific metadata value.

	 *                                                Usually used in conjunction with `$meta_key`. Default empty.

	 *     @type string       $meta_type              MySQL data type that the `$meta_value` will be CAST to for

	 *                                                comparisons. Default empty.

	 *     @type string       $meta_compare           Comparison operator to test the 'meta_value'. Default empty.

	 * }

	 */

	public function __construct( $query = '' ) {

		$this->query_var_defaults = array(

			'taxonomy'               => null,

			'object_ids'             => null,

			'orderby'                => 'name',

			'order'                  => 'ASC',

			'hide_empty'             => true,

			'include'                => array(),

			'exclude'                => array(),

			'exclude_tree'           => array(),

			'number'                 => '',

			'offset'                 => '',

			'fields'                 => 'all',

			'count'                  => false,

			'name'                   => '',

			'slug'                   => '',

			'term_taxonomy_id'       => '',

			'hierarchical'           => true,

			'search'                 => '',

			'name__like'             => '',

			'description__like'      => '',

			'pad_counts'             => false,

			'get'                    => '',

			'child_of'               => 0,

			'parent'                 => '',

			'childless'              => false,

			'cache_domain'           => 'core',

			'update_term_meta_cache' => true,

			'meta_query'             => '',

			'meta_key'               => '',

			'meta_value'             => '',

			'meta_type'              => '',

			'meta_compare'           => '',

		);

		if ( ! empty( $query ) ) {

			$this->query( $query );

		}

	}

	/**

	 * Parse arguments passed to the term query with default query parameters.

	 *

	 * @since 4.6.0

	 *

	 * @param string|array $query WP_Term_Query arguments. See WP_Term_Query::__construct()

	 */

	public function parse_query( $query = '' ) {

		if ( empty( $query ) ) {

			$query = $this->query_vars;

		}

		$taxonomies = isset( $query['taxonomy'] ) ? (array) $query['taxonomy'] : null;

		/**

		 * Filters the terms query default arguments.

		 *

		 * Use {@see 'get_terms_args'} to filter the passed arguments.

		 *

		 * @since 4.4.0

		 *

		 * @param array    $defaults   An array of default get_terms() arguments.

		 * @param string[] $taxonomies An array of taxonomy names.

		 */

		$this->query_var_defaults = apply_filters( 'get_terms_defaults', $this->query_var_defaults, $taxonomies );

		$query = wp_parse_args( $query, $this->query_var_defaults );

		$query['number'] = absint( $query['number'] );

		$query['offset'] = absint( $query['offset'] );

		// 'parent' overrides 'child_of'.

			$query['child_of'] = false;

		}

		if ( 'all' === $query['get'] ) {

			$query['childless']    = false;

			$query['child_of']     = 0;

			$query['hide_empty']   = 0;

			$query['hierarchical'] = false;

			$query['pad_counts']   = false;

		}

		$query['taxonomy'] = $taxonomies;

		$this->query_vars = $query;

		/**

		 * Fires after term query vars have been parsed.

		 *

		 * @since 4.6.0

		 *

		 * @param WP_Term_Query $this Current instance of WP_Term_Query.

		 */

		do_action( 'parse_term_query', $this );

	}

	/**

	 *

	 * @since 4.6.0

	 *

	 * @param string|array $query Array or URL query string of parameters.

	 */

	public function query( $query ) {

		$this->query_vars = wp_parse_args( $query );

		return $this->get_terms();

	}

	/**

	 *

	 * @since 4.6.0

	 *

	 * @global wpdb $wpdb WordPress database abstraction object.

	 *

	 */

	public function get_terms() {

		global $wpdb;

		$this->parse_query( $this->query_vars );

		$args = &$this->query_vars;

		// Set up meta_query so it's available to 'pre_get_terms'.

		$this->meta_query = new WP_Meta_Query();

		$this->meta_query->parse_query_vars( $args );

		/**

		 * Fires before terms are retrieved.

		 *

		 * @since 4.6.0

		 *

		 */

		$taxonomies = (array) $args['taxonomy'];

		// Save queries by not crawling the tree in the case of multiple taxes or a flat tax.

		$has_hierarchical_tax = false;

		if ( $taxonomies ) {

			foreach ( $taxonomies as $_tax ) {

				if ( is_taxonomy_hierarchical( $_tax ) ) {

					$has_hierarchical_tax = true;

				}

			}

		} else {

			// When no taxonomies are provided, assume we have to descend the tree.

			$has_hierarchical_tax = true;

		}

		if ( ! $has_hierarchical_tax ) {

			$args['hierarchical'] = false;

			$args['pad_counts']   = false;

		}

		// 'parent' overrides 'child_of'.

			$args['child_of'] = false;

		}

		if ( 'all' === $args['get'] ) {

			$args['childless']    = false;

			$args['child_of']     = 0;

			$args['hide_empty']   = 0;

			$args['hierarchical'] = false;

			$args['pad_counts']   = false;

		}

		/**

		 * Filters the terms query arguments.

		 *

		 * @since 3.1.0

		 *

		 * @param array    $args       An array of get_terms() arguments.

		 * @param string[] $taxonomies An array of taxonomy names.

		 */

		$args = apply_filters( 'get_terms_args', $args, $taxonomies );

		// Avoid the query if the queried parent/child_of term has no descendants.

		$child_of = $args['child_of'];

		$parent   = $args['parent'];

		if ( $child_of ) {

			$_parent = $child_of;

		} elseif ( $parent ) {

			$_parent = $parent;

		} else {

			$_parent = false;

		}

		if ( $_parent ) {

			$in_hierarchy = false;

			foreach ( $taxonomies as $_tax ) {

				$hierarchy = _get_term_hierarchy( $_tax );

				if ( isset( $hierarchy[ $_parent ] ) ) {

					$in_hierarchy = true;

				}

			}

			if ( ! $in_hierarchy ) {

				if ( 'count' === $args['fields'] ) {

					return 0;

				} else {

					$this->terms = array();

					return $this->terms;

				}

			}

		}

		// 'term_order' is a legal sort order only when joining the relationship table.

		$_orderby = $this->query_vars['orderby'];

		if ( 'term_order' === $_orderby && empty( $this->query_vars['object_ids'] ) ) {

			$_orderby = 'term_id';

		}

		$orderby = $this->parse_orderby( $_orderby );

		if ( $orderby ) {

			$orderby = "ORDER BY $orderby";

		}

		$order = $this->parse_order( $this->query_vars['order'] );