Woocommerce – how to customize widget code?

I need to customize some lines in price slider widget located at woocommerce/includes/widgets/class-wc-widget-price-filter.php. There is no template available, so I have serious problem…
I only need to add some HTML with classes to this echoed form:

echo ‘<form method=”get” action=”‘ . esc_url( $form_action ) . ‘”>
<div class=”price_slider_wrapper”>
<div class=”price_slider” style=”display:none;”></div>
<div class=”price_slider_amount” data-step=”‘ . esc_attr( $step ) . ‘”>
<input type=”text” id=”min_price” name=”min_price” value=”‘ . esc_attr( $current_min_price ) . ‘” data-min=”‘ . esc_attr( $min_price ) . ‘” placeholder=”‘ . esc_attr__( ‘Min price’, ‘woocommerce’ ) . ‘” />
<input type=”text” id=”max_price” name=”max_price” value=”‘ . esc_attr( $current_max_price ) . ‘” data-max=”‘ . esc_attr( $max_price ) . ‘” placeholder=”‘ . esc_attr__( ‘Max price’, ‘woocommerce’ ) . ‘” />
<button type=”submit” class=”button”>’ . esc_html__( ‘Filter’, ‘woocommerce’ ) . ‘</button>
<div class=”price_label” style=”display:none;”>
‘ . esc_html__( ‘Price:’, ‘woocommerce’ ) . ‘ <span class=”from”></span> &mdash; <span class=”to”></span>
</div>
‘ . wc_query_string_form_fields( null, array( ‘min_price’, ‘max_price’, ‘paged’ ), ”, true ) . ‘
<div class=”clear”></div>
</div>
</div>
</form>’;

Full source here:

<?php
/**
* Price Filter Widget and related functions.
*
* Generates a range slider to filter products by price.
*
* @package WooCommerce/Widgets
* @version 2.3.0
*/
defined( ‘ABSPATH’ ) || exit;
/**
* Widget price filter class.
*/
class WC_Widget_Price_Filter extends WC_Widget {
/**
* Constructor.
*/
public function __construct() {
$this->widget_cssclass = ‘woocommerce widget_price_filter’;
$this->widget_description = __( ‘Display a slider to filter products in your store by price.’, ‘woocommerce’ );
$this->widget_id = ‘woocommerce_price_filter’;
$this->widget_name = __( ‘Filter Products by Price’, ‘woocommerce’ );
$this->settings = array(
‘title’ => array(
‘type’ => ‘text’,
‘std’ => __( ‘Filter by price’, ‘woocommerce’ ),
‘label’ => __( ‘Title’, ‘woocommerce’ ),
),
);
$suffix = defined( ‘SCRIPT_DEBUG’ ) && SCRIPT_DEBUG ? ” : ‘.min’;
wp_register_script( ‘accounting’, WC()->plugin_url() . ‘/assets/js/accounting/accounting’ . $suffix . ‘.js’, array( ‘jquery’ ), ‘0.4.2’, true );
wp_register_script( ‘wc-jquery-ui-touchpunch’, WC()->plugin_url() . ‘/assets/js/jquery-ui-touch-punch/jquery-ui-touch-punch’ . $suffix . ‘.js’, array( ‘jquery-ui-slider’ ), WC_VERSION, true );
wp_register_script( ‘wc-price-slider’, WC()->plugin_url() . ‘/assets/js/frontend/price-slider’ . $suffix . ‘.js’, array( ‘jquery-ui-slider’, ‘wc-jquery-ui-touchpunch’, ‘accounting’ ), WC_VERSION, true );
wp_localize_script(
‘wc-price-slider’,
‘woocommerce_price_slider_params’,
array(
‘currency_format_num_decimals’ => 0,
‘currency_format_symbol’ => get_woocommerce_currency_symbol(),
‘currency_format_decimal_sep’ => esc_attr( wc_get_price_decimal_separator() ),
‘currency_format_thousand_sep’ => esc_attr( wc_get_price_thousand_separator() ),
‘currency_format’ => esc_attr( str_replace( array( ‘%1$s’, ‘%2$s’ ), array( ‘%s’, ‘%v’ ), get_woocommerce_price_format() ) ),
)
);
if ( is_customize_preview() ) {
wp_enqueue_script( ‘wc-price-slider’ );
}
parent::__construct();
}
/**
* Output widget.
*
* @see WP_Widget
*
* @param array $args Arguments.
* @param array $instance Widget instance.
*/
public function widget( $args, $instance ) {
global $wp;
// Requires lookup table added in 3.6.
if ( version_compare( get_option( ‘woocommerce_db_version’, null ), ‘3.6’, ‘<‘ ) ) {
return;
}
if ( ! is_shop() && ! is_product_taxonomy() ) {
return;
}
// If there are not posts and we’re not filtering, hide the widget.
if ( ! WC()->query->get_main_query()->post_count && ! isset( $_GET[‘min_price’] ) && ! isset( $_GET[‘max_price’] ) ) { // WPCS: input var ok, CSRF ok.
return;
}
wp_enqueue_script( ‘wc-price-slider’ );
// Round values to nearest 10 by default.
$step = max( apply_filters( ‘woocommerce_price_filter_widget_step’, 10 ), 1 );
// Find min and max price in current result set.
$prices = $this->get_filtered_price();
$min_price = $prices->min_price;
$max_price = $prices->max_price;
// Check to see if we should add taxes to the prices if store are excl tax but display incl.
$tax_display_mode = get_option( ‘woocommerce_tax_display_shop’ );
if ( wc_tax_enabled() && ! wc_prices_include_tax() && ‘incl’ === $tax_display_mode ) {
$tax_class = apply_filters( ‘woocommerce_price_filter_widget_tax_class’, ” ); // Uses standard tax class.
$tax_rates = WC_Tax::get_rates( $tax_class );
if ( $tax_rates ) {
$min_price += WC_Tax::get_tax_total( WC_Tax::calc_exclusive_tax( $min_price, $tax_rates ) );
$max_price += WC_Tax::get_tax_total( WC_Tax::calc_exclusive_tax( $max_price, $tax_rates ) );
}
}
$min_price = apply_filters( ‘woocommerce_price_filter_widget_min_amount’, floor( $min_price / $step ) * $step );
$max_price = apply_filters( ‘woocommerce_price_filter_widget_max_amount’, ceil( $max_price / $step ) * $step );
// If both min and max are equal, we don’t need a slider.
if ( $min_price === $max_price ) {
return;
}
$current_min_price = isset( $_GET[‘min_price’] ) ? floor( floatval( wp_unslash( $_GET[‘min_price’] ) ) / $step ) * $step : $min_price; // WPCS: input var ok, CSRF ok.
$current_max_price = isset( $_GET[‘max_price’] ) ? ceil( floatval( wp_unslash( $_GET[‘max_price’] ) ) / $step ) * $step : $max_price; // WPCS: input var ok, CSRF ok.
$this->widget_start( $args, $instance );
if ( ” === get_option( ‘permalink_structure’ ) ) {
$form_action = remove_query_arg( array( ‘page’, ‘paged’, ‘product-page’ ), add_query_arg( $wp->query_string, ”, home_url( $wp->request ) ) );
} else {
$form_action = preg_replace( ‘%/page/[0-9]+%’, ”, home_url( trailingslashit( $wp->request ) ) );
}
echo ‘<form method=”get” action=”‘ . esc_url( $form_action ) . ‘”>
<div class=”price_slider_wrapper”>
<div class=”price_slider” style=”display:none;”></div>
<div class=”price_slider_amount” data-step=”‘ . esc_attr( $step ) . ‘”>
<input type=”text” id=”min_price” name=”min_price” value=”‘ . esc_attr( $current_min_price ) . ‘” data-min=”‘ . esc_attr( $min_price ) . ‘” placeholder=”‘ . esc_attr__( ‘Min price’, ‘woocommerce’ ) . ‘” />
<input type=”text” id=”max_price” name=”max_price” value=”‘ . esc_attr( $current_max_price ) . ‘” data-max=”‘ . esc_attr( $max_price ) . ‘” placeholder=”‘ . esc_attr__( ‘Max price’, ‘woocommerce’ ) . ‘” />
<button type=”submit” class=”button”>’ . esc_html__( ‘Filter’, ‘woocommerce’ ) . ‘</button>
<div class=”price_label” style=”display:none;”>
‘ . esc_html__( ‘Price:’, ‘woocommerce’ ) . ‘ <span class=”from”></span> &mdash; <span class=”to”></span>
</div>
‘ . wc_query_string_form_fields( null, array( ‘min_price’, ‘max_price’, ‘paged’ ), ”, true ) . ‘
<div class=”clear”></div>
</div>
</div>
</form>’; // WPCS: XSS ok.
$this->widget_end( $args );
}
/**
* Get filtered min price for current products.
*
* @return int
*/
protected function get_filtered_price() {
global $wpdb;
$args = WC()->query->get_main_query()->query_vars;
$tax_query = isset( $args[‘tax_query’] ) ? $args[‘tax_query’] : array();
$meta_query = isset( $args[‘meta_query’] ) ? $args[‘meta_query’] : array();
if ( ! is_post_type_archive( ‘product’ ) && ! empty( $args[‘taxonomy’] ) && ! empty( $args[‘term’] ) ) {
$tax_query[] = WC()->query->get_main_tax_query();
}
foreach ( $meta_query + $tax_query as $key => $query ) {
if ( ! empty( $query[‘price_filter’] ) || ! empty( $query[‘rating_filter’] ) ) {
unset( $meta_query[ $key ] );
}
}
$meta_query = new WP_Meta_Query( $meta_query );
$tax_query = new WP_Tax_Query( $tax_query );
$search = WC_Query::get_main_search_query_sql();
$meta_query_sql = $meta_query->get_sql( ‘post’, $wpdb->posts, ‘ID’ );
$tax_query_sql = $tax_query->get_sql( $wpdb->posts, ‘ID’ );
$search_query_sql = $search ? ‘ AND ‘ . $search : ”;
$sql = ”
SELECT min( min_price ) as min_price, MAX( max_price ) as max_price
FROM {$wpdb->wc_product_meta_lookup}
WHERE product_id IN (
SELECT ID FROM {$wpdb->posts}
” . $tax_query_sql[‘join’] . $meta_query_sql[‘join’] . ”
WHERE {$wpdb->posts}.post_type IN (‘” . implode( “‘,'”, array_map( ‘esc_sql’, apply_filters( ‘woocommerce_price_filter_post_type’, array( ‘product’ ) ) ) ) . “‘)
AND {$wpdb->posts}.post_status = ‘publish’
” . $tax_query_sql[‘where’] . $meta_query_sql[‘where’] . $search_query_sql . ‘
)’;
$sql = apply_filters( ‘woocommerce_price_filter_sql’, $sql, $meta_query_sql, $tax_query_sql );
return $wpdb->get_row( $sql ); // WPCS: unprepared SQL ok.
}
}

Is there some filter or action hook to replace form code?
Thanks a lot!

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