public function query_args( $args, $request ) {
		// Set post_status.
		$args['post_status'] = $request['status'];

		// Taxonomy query to filter products by type, category,
		// tag, shipping class, and attribute.
		$tax_query = array();

		// Map between taxonomy name and arg's key.
		$taxonomies = array(
			'product_cat'            => 'category',
			'product_tag'            => 'tag',
			'product_shipping_class' => 'shipping_class',
		);

		// Set tax_query for each passed arg.
		foreach ( $taxonomies as $taxonomy => $key ) {
			if ( ! empty( $request[ $key ] ) ) {
				$tax_query[] = array(
					'taxonomy' => $taxonomy,
					'field'    => 'term_id',
					'terms'    => $request[ $key ],
				);
			}
		}

		// Filter product type by slug.
		if ( ! empty( $request['type'] ) ) {
			$tax_query[] = array(
				'taxonomy' => 'product_type',
				'field'    => 'slug',
				'terms'    => $request['type'],
			);
		}

		// Filter by attribute and term.
		if ( ! empty( $request['attribute'] ) && ! empty( $request['attribute_term'] ) ) {
			if ( in_array( $request['attribute'], wc_get_attribute_taxonomy_names(), true ) ) {
				$tax_query[] = array(
					'taxonomy' => $request['attribute'],
					'field'    => 'term_id',
					'terms'    => $request['attribute_term'],
				);
			}
		}

		if ( ! empty( $tax_query ) ) {
			$args['tax_query'] = $tax_query;
		}

		// Filter featured.
		if ( is_bool( $request['featured'] ) ) {
			$args['tax_query'][] = array(
				'taxonomy' => 'product_visibility',
				'field'    => 'name',
				'terms'    => 'featured',
				'operator' => true === $request['featured'] ? 'IN' : 'NOT IN',
			);
		}

		// Filter by sku.
		if ( ! empty( $request['sku'] ) ) {
			$skus = explode( ',', $request['sku'] );
			// Include the current string as a SKU too.
			if ( 1 < count( $skus ) ) {
				$skus[] = $request['sku'];
			}

			$args['meta_query'] = $this->add_meta_query( $args, array(
				'key'     => '_sku',
				'value'   => $skus,
				'compare' => 'IN',
			) );
		}

		// Filter by tax class.
		if ( ! empty( $request['tax_class'] ) ) {
			$args['meta_query'] = $this->add_meta_query( $args, array(
				'key'   => '_tax_class',
				'value' => 'standard' !== $request['tax_class'] ? $request['tax_class'] : '',
			) );
		}

		// Price filter.
		if ( ! empty( $request['min_price'] ) || ! empty( $request['max_price'] ) ) {
			$args['meta_query'] = $this->add_meta_query( $args, wc_get_min_max_price_meta_query( $request ) );
		}

		// Filter product in stock or out of stock.
		if ( is_bool( $request['in_stock'] ) ) {
			$args['meta_query'] = $this->add_meta_query( $args, array(
				'key'   => '_stock_status',
				'value' => true === $request['in_stock'] ? 'instock' : 'outofstock',
			) );
		}

		// Filter by on sale products.
		if ( is_bool( $request['on_sale'] ) ) {
			$on_sale_key           = $request['on_sale'] ? 'post__in' : 'post__not_in';
			$args[ $on_sale_key ] += wc_get_product_ids_on_sale();
		}

		// Force the post_type argument, since it's not a user input variable.
		if ( ! empty( $request['sku'] ) ) {
			$args['post_type'] = array( 'product', 'product_variation' );
		} else {
			$args['post_type'] = $this->post_type;
		}

		return $args;
	}