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<?php

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/**

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* Style Engine: WP_Style_Engine_Processor class

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* @package WordPress

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* @subpackage StyleEngine

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* @since 6.1.0

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/**

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* Core class used to compile styles from stores or collection of CSS rules.

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* @since 6.1.0

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#[AllowDynamicProperties]

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class WP_Style_Engine_Processor {

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/**

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* A collection of Style Engine Store objects.

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* @since 6.1.0

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* @var WP_Style_Engine_CSS_Rules_Store[]

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protected $stores = array();

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/**

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* The set of CSS rules that this processor will work on.

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* @since 6.1.0

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* @var WP_Style_Engine_CSS_Rule[]

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protected $css_rules = array();

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/**

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* Adds a store to the processor.

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* @since 6.1.0

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* @param WP_Style_Engine_CSS_Rules_Store $store The store to add.

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* @return WP_Style_Engine_Processor Returns the object to allow chaining methods.

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public function add_store( $store ) {

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if ( ! $store instanceof WP_Style_Engine_CSS_Rules_Store ) {

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_doing_it_wrong(

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__METHOD__,

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__( '$store must be an instance of WP_Style_Engine_CSS_Rules_Store' ),

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'6.1.0'

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);

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return $this;

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}

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

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return $this;

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}

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/**

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* Adds rules to be processed.

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* @since 6.1.0

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* @since 6.6.0 Added support for rules_group.

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* @param WP_Style_Engine_CSS_Rule|WP_Style_Engine_CSS_Rule[] $css_rules A single, or an array of,

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* WP_Style_Engine_CSS_Rule objects

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* from a store or otherwise.

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* @return WP_Style_Engine_Processor Returns the object to allow chaining methods.

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public function add_rules( $css_rules ) {

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if ( ! is_array( $css_rules ) ) {

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$css_rules = array( $css_rules );

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}

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foreach ( $css_rules as $rule ) {

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$selector = $rule->get_selector();

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$rules_group = $rule->get_rules_group();

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/**

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* If there is a rules_group and it already exists in the css_rules array,

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* add the rule to it.

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* Otherwise, create a new entry for the rules_group.

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if ( ! empty( $rules_group ) ) {

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if ( isset( $this->css_rules[ "$rules_group $selector" ] ) ) {

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$this->css_rules[ "$rules_group $selector" ]->add_declarations( $rule->get_declarations() );

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continue;

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}

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$this->css_rules[ "$rules_group $selector" ] = $rule;

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continue;

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}

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// If the selector already exists, add the declarations to it.

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if ( isset( $this->css_rules[ $selector ] ) ) {

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$this->css_rules[ $selector ]->add_declarations( $rule->get_declarations() );

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continue;

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}

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$this->css_rules[ $rule->get_selector() ] = $rule;

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}

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return $this;

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}

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/**

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* Gets the CSS rules as a string.

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* @since 6.1.0

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* @since 6.4.0 The Optimization is no longer the default.

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* @param array $options {

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* Optional. An array of options. Default empty array.

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* @type bool $optimize Whether to optimize the CSS output, e.g. combine rules.

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* Default false.

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* @type bool $prettify Whether to add new lines and indents to output.

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* Defaults to whether the `SCRIPT_DEBUG` constant is defined.

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* }

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* @return string The computed CSS.

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public function get_css( $options = array() ) {

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$defaults = array(

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'optimize' => false,

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'prettify' => defined( 'SCRIPT_DEBUG' ) && SCRIPT_DEBUG,

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);

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$options = wp_parse_args( $options, $defaults );

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// If we have stores, get the rules from them.

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foreach ( $this->stores as $store ) {

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$this->add_rules( $store->get_all_rules() );

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}

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// Combine CSS selectors that have identical declarations.

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if ( true === $options['optimize'] ) {

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$this->combine_rules_selectors();

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}

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// Build the CSS.

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$css = '';

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foreach ( $this->css_rules as $rule ) {

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// See class WP_Style_Engine_CSS_Rule for the get_css method.

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$css .= $rule->get_css( $options['prettify'] );

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$css .= $options['prettify'] ? "\n" : '';

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}

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return $css;

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}

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/**

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* Combines selectors from the rules store when they have the same styles.

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* @since 6.1.0

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private function combine_rules_selectors() {

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// Build an array of selectors along with the JSON-ified styles to make comparisons easier.

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$selectors_json = array();

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foreach ( $this->css_rules as $rule ) {

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$declarations = $rule->get_declarations()->get_declarations();

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ksort( $declarations );

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$selectors_json[ $rule->get_selector() ] = wp_json_encode( $declarations );

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}

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// Combine selectors that have the same styles.

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foreach ( $selectors_json as $selector => $json ) {

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// Get selectors that use the same styles.

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$duplicates = array_keys( $selectors_json, $json, true );

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// Skip if there are no duplicates.

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if ( 1 >= count( $duplicates ) ) {

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continue;

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}

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

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foreach ( $duplicates as $key ) {

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// Unset the duplicates from the $selectors_json array to avoid looping through them as well.

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unset( $selectors_json[ $key ] );

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// Remove the rules from the rules collection.

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unset( $this->css_rules[ $key ] );

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}

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// Create a new rule with the combined selectors.

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$duplicate_selectors = implode( ',', $duplicates );

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$this->css_rules[ $duplicate_selectors ] = new WP_Style_Engine_CSS_Rule( $duplicate_selectors, $declarations );

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}

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}

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}

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