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Editing: class-wp-style-engine-processor.php

<?php
/**
 * WP_Style_Engine_Processor
 *
 * Compiles styles from stores or collection of CSS rules.
 *
 * @package WordPress
 * @subpackage StyleEngine
 * @since 6.1.0
 */

/**
 * Class WP_Style_Engine_Processor.
 *
 * Compiles styles from stores or collection of CSS rules.
 *
 * @since 6.1.0
 */
#[AllowDynamicProperties]
class WP_Style_Engine_Processor {

/**
	 * A collection of Style Engine Store objects.
	 *
	 * @since 6.1.0
	 * @var WP_Style_Engine_CSS_Rules_Store[]
	 */
	protected $stores = array();

/**
	 * The set of CSS rules that this processor will work on.
	 *
	 * @since 6.1.0
	 * @var WP_Style_Engine_CSS_Rule[]
	 */
	protected $css_rules = array();

/**
	 * Adds a store to the processor.
	 *
	 * @since 6.1.0
	 *
	 * @param WP_Style_Engine_CSS_Rules_Store $store The store to add.
	 *
	 * @return WP_Style_Engine_Processor Returns the object to allow chaining methods.
	 */
	public function add_store( $store ) {
		if ( ! $store instanceof WP_Style_Engine_CSS_Rules_Store ) {
			_doing_it_wrong(
				__METHOD__,
				__( '$store must be an instance of WP_Style_Engine_CSS_Rules_Store' ),
				'6.1.0'
			);
			return $this;
		}

$this->stores[ $store->get_name() ] = $store;

return $this;
	}

/**
	 * Adds rules to be processed.
	 *
	 * @since 6.1.0
	 *
	 * @param WP_Style_Engine_CSS_Rule|WP_Style_Engine_CSS_Rule[] $css_rules A single, or an array of, WP_Style_Engine_CSS_Rule objects from a store or otherwise.
	 *
	 * @return WP_Style_Engine_Processor Returns the object to allow chaining methods.
	 */
	public function add_rules( $css_rules ) {
		if ( ! is_array( $css_rules ) ) {
			$css_rules = array( $css_rules );
		}

foreach ( $css_rules as $rule ) {
			$selector = $rule->get_selector();
			if ( isset( $this->css_rules[ $selector ] ) ) {
				$this->css_rules[ $selector ]->add_declarations( $rule->get_declarations() );
				continue;
			}
			$this->css_rules[ $rule->get_selector() ] = $rule;
		}

return $this;
	}

/**
	 * Gets the CSS rules as a string.
	 *
	 * @since 6.1.0
	 *
	 * @param array $options   {
	 *     Optional. An array of options. Default empty array.
	 *
	 *     @type bool $optimize Whether to optimize the CSS output, e.g., combine rules. Default is `false`.
	 *     @type bool $prettify Whether to add new lines and indents to output. Default is the test of whether the global constant `SCRIPT_DEBUG` is defined.
	 * }
	 *
	 * @return string The computed CSS.
	 */
	public function get_css( $options = array() ) {
		$defaults = array(
			'optimize' => true,
			'prettify' => defined( 'SCRIPT_DEBUG' ) && SCRIPT_DEBUG,
		);
		$options  = wp_parse_args( $options, $defaults );

// If we have stores, get the rules from them.
		foreach ( $this->stores as $store ) {
			$this->add_rules( $store->get_all_rules() );
		}

// Combine CSS selectors that have identical declarations.
		if ( true === $options['optimize'] ) {
			$this->combine_rules_selectors();
		}

// Build the CSS.
		$css = '';
		foreach ( $this->css_rules as $rule ) {
			$css .= $rule->get_css( $options['prettify'] );
			$css .= $options['prettify'] ? "\n" : '';
		}
		return $css;
	}

/**
	 * Combines selectors from the rules store when they have the same styles.
	 *
	 * @since 6.1.0
	 *
	 * @return void
	 */
	private function combine_rules_selectors() {
		// Build an array of selectors along with the JSON-ified styles to make comparisons easier.
		$selectors_json = array();
		foreach ( $this->css_rules as $rule ) {
			$declarations = $rule->get_declarations()->get_declarations();
			ksort( $declarations );
			$selectors_json[ $rule->get_selector() ] = wp_json_encode( $declarations );
		}

// Combine selectors that have the same styles.
		foreach ( $selectors_json as $selector => $json ) {
			// Get selectors that use the same styles.
			$duplicates = array_keys( $selectors_json, $json, true );
			// Skip if there are no duplicates.
			if ( 1 >= count( $duplicates ) ) {
				continue;
			}

$declarations = $this->css_rules[ $selector ]->get_declarations();

foreach ( $duplicates as $key ) {
				// Unset the duplicates from the $selectors_json array to avoid looping through them as well.
				unset( $selectors_json[ $key ] );
				// Remove the rules from the rules collection.
				unset( $this->css_rules[ $key ] );
			}
			// Create a new rule with the combined selectors.
			$duplicate_selectors                     = implode( ',', $duplicates );
			$this->css_rules[ $duplicate_selectors ] = new WP_Style_Engine_CSS_Rule( $duplicate_selectors, $declarations );
		}
	}
}

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