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Editing: class-wp-style-engine-css-rule.php

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<?php
/**
 * Style Engine: WP_Style_Engine_CSS_Rule class
 *
 * @package WordPress
 * @subpackage StyleEngine
 * @since 6.1.0
 */

/**
 * Core class used for style engine CSS rules.
 *
 * Holds, sanitizes, processes, and prints CSS declarations for the style engine.
 *
 * @since 6.1.0
 */
#[AllowDynamicProperties]
class WP_Style_Engine_CSS_Rule {

/**
	 * The selector.
	 *
	 * @since 6.1.0
	 * @var string
	 */
	protected $selector;

/**
	 * The selector declarations.
	 *
	 * Contains a WP_Style_Engine_CSS_Declarations object.
	 *
	 * @since 6.1.0
	 * @var WP_Style_Engine_CSS_Declarations
	 */
	protected $declarations;

/**
	 * A parent CSS selector in the case of nested CSS, or a CSS nested @rule,
	 * such as `@media (min-width: 80rem)` or `@layer module`.
	 *
	 * @since 6.6.0
	 * @var string
	 */
	protected $rules_group;

/**
	 * Constructor.
	 *
	 * @since 6.1.0
	 * @since 6.6.0 Added the `$rules_group` parameter.
	 *
	 * @param string                                    $selector     Optional. The CSS selector. Default empty string.
	 * @param string[]|WP_Style_Engine_CSS_Declarations $declarations Optional. An associative array of CSS definitions,
	 *                                                                e.g. `array( "$property" => "$value", "$property" => "$value" )`,
	 *                                                                or a WP_Style_Engine_CSS_Declarations object.
	 *                                                                Default empty array.
	 * @param string                                    $rules_group  A parent CSS selector in the case of nested CSS, or a CSS nested @rule,
	 *                                                                such as `@media (min-width: 80rem)` or `@layer module`.
	 */
	public function __construct( $selector = '', $declarations = array(), $rules_group = '' ) {
		$this->set_selector( $selector );
		$this->add_declarations( $declarations );
		$this->set_rules_group( $rules_group );
	}

/**
	 * Sets the selector.
	 *
	 * @since 6.1.0
	 *
	 * @param string $selector The CSS selector.
	 * @return WP_Style_Engine_CSS_Rule Returns the object to allow chaining of methods.
	 */
	public function set_selector( $selector ) {
		$this->selector = $selector;
		return $this;
	}

/**
	 * Sets the declarations.
	 *
	 * @since 6.1.0
	 * @since 7.1.0 Preserves declaration options when declarations are provided as a `WP_Style_Engine_CSS_Declarations` object.
	 *
	 * @param string[]|WP_Style_Engine_CSS_Declarations $declarations An array of declarations (property => value pairs),
	 *                                                                or a WP_Style_Engine_CSS_Declarations object.
	 * @return WP_Style_Engine_CSS_Rule Returns the object to allow chaining of methods.
	 */
	public function add_declarations( $declarations ) {
		$is_declarations_object = ! is_array( $declarations );
		$declarations_array     = $is_declarations_object ? $declarations->get_declarations() : $declarations;
		$declaration_options    = $is_declarations_object ? $declarations->get_declaration_options() : array();

if ( null === $this->declarations ) {
			if ( $is_declarations_object ) {
				$this->declarations = $declarations;
				return $this;
			}
			$this->declarations = new WP_Style_Engine_CSS_Declarations();
		}

foreach ( $declarations_array as $property => $value ) {
			$this->declarations->add_declaration(
				$property,
				$value,
				$declaration_options[ $property ] ?? array()
			);
		}

return $this;
	}

/**
	 * Sets the rules group.
	 *
	 * @since 6.6.0
	 *
	 * @param string $rules_group A parent CSS selector in the case of nested CSS, or a CSS nested @rule,
	 *                            such as `@media (min-width: 80rem)` or `@layer module`.
	 * @return WP_Style_Engine_CSS_Rule Returns the object to allow chaining of methods.
	 */
	public function set_rules_group( $rules_group ) {
		$this->rules_group = $rules_group;
		return $this;
	}

/**
	 * Gets the rules group.
	 *
	 * @since 6.6.0
	 *
	 * @return string
	 */
	public function get_rules_group() {
		return $this->rules_group;
	}

/**
	 * Gets the declarations object.
	 *
	 * @since 6.1.0
	 *
	 * @return WP_Style_Engine_CSS_Declarations The declarations object.
	 */
	public function get_declarations() {
		return $this->declarations;
	}

/**
	 * Gets the full selector.
	 *
	 * @since 6.1.0
	 *
	 * @return string
	 */
	public function get_selector() {
		return $this->selector;
	}

/**
	 * Gets the CSS.
	 *
	 * @since 6.1.0
	 * @since 6.6.0 Added support for nested CSS with rules groups.
	 *
	 * @param bool $should_prettify Optional. Whether to add spacing, new lines and indents.
	 *                              Default false.
	 * @param int  $indent_count    Optional. The number of tab indents to apply to the rule.
	 *                              Applies if `prettify` is `true`. Default 0.
	 * @return string
	 */
	public function get_css( $should_prettify = false, $indent_count = 0 ) {
		$rule_indent                = $should_prettify ? str_repeat( "\t", $indent_count ) : '';
		$nested_rule_indent         = $should_prettify ? str_repeat( "\t", $indent_count + 1 ) : '';
		$declarations_indent        = $should_prettify ? $indent_count + 1 : 0;
		$nested_declarations_indent = $should_prettify ? $indent_count + 2 : 0;
		$suffix                     = $should_prettify ? "\n" : '';
		$spacer                     = $should_prettify ? ' ' : '';
		// Trims any multiple selectors strings.
		$selector         = $should_prettify ? implode( ',', array_map( 'trim', explode( ',', $this->get_selector() ) ) ) : $this->get_selector();
		$selector         = $should_prettify ? str_replace( array( ',' ), ",\n", $selector ) : $selector;
		$rules_group      = $this->get_rules_group();
		$has_rules_group  = ! empty( $rules_group );
		$css_declarations = $this->declarations->get_declarations_string( $should_prettify, $has_rules_group ? $nested_declarations_indent : $declarations_indent );

if ( empty( $css_declarations ) ) {
			return '';
		}

if ( $has_rules_group ) {
			$selector = "{$rule_indent}{$rules_group}{$spacer}{{$suffix}{$nested_rule_indent}{$selector}{$spacer}{{$suffix}{$css_declarations}{$suffix}{$nested_rule_indent}}{$suffix}{$rule_indent}}";
			return $selector;
		}

return "{$rule_indent}{$selector}{$spacer}{{$suffix}{$css_declarations}{$suffix}{$rule_indent}}";
	}
}

Editing: class-wp-style-engine-css-rule.php

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