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<?php /** * Style Engine: WP_Style_Engine_Processor class * * @package WordPress * @subpackage StyleEngine * @since 6.1.0 / /* * Core class used to compile 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 * @since 6.6.0 Added support for rules_group. * * @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(); $rules_group = $rule->get_rules_group(); /* * If there is a rules_group and it already exists in the css_rules array, * add the rule to it. * Otherwise, create a new entry for the rules_group. / if ( ! empty( $rules_group ) ) { if ( isset( $this->css_rules[ "$rules_group $selector" ] ) ) { $this->css_rules[ "$rules_group $selector" ]->add_declarations( $rule->get_declarations() ); continue; } $this->css_rules[ "$rules_group $selector" ] = $rule; continue; } // If the selector already exists, add the declarations to it. 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 * @since 6.4.0 The Optimization is no longer the default. * * @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 false. * @type bool $prettify Whether to add new lines and indents to output. * Defaults to whether the `SCRIPT_DEBUG` constant is defined. * } * @return string The computed CSS. / public function get_css( $options = array() ) { $defaults = array( 'optimize' => false, '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 ) { // See class WP_Style_Engine_CSS_Rule for the get_css method. $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 */ 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 ); } } }