Adding upstream version 6.4.3+dfsg1.upstream/6.4.3+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

5 files changed, 1334 insertions, 0 deletions

diff --git a/wp-includes/style-engine/class-wp-style-engine-css-declarations.php b/wp-includes/style-engine/class-wp-style-engine-css-declarations.php
new file mode 100644
index 0000000..fbcb54b
--- /dev/null
+++ b/wp-includes/style-engine/class-wp-style-engine-css-declarations.php
@@ -0,0 +1,187 @@
+<?php
+/**
+ * Style Engine: WP_Style_Engine_CSS_Declarations class
+ *
+ * @package WordPress
+ * @subpackage StyleEngine
+ * @since 6.1.0
+ */
+
+/**
+ * Core class used for style engine CSS declarations.
+ *
+ * Holds, sanitizes, processes, and prints CSS declarations for the style engine.
+ *
+ * @since 6.1.0
+ */
+#[AllowDynamicProperties]
+class WP_Style_Engine_CSS_Declarations {
+
+	/**
+	 * An array of CSS declarations (property => value pairs).
+	 *
+	 * @since 6.1.0
+	 *
+	 * @var string[]
+	 */
+	protected $declarations = array();
+
+	/**
+	 * Constructor for this object.
+	 *
+	 * If a `$declarations` array is passed, it will be used to populate
+	 * the initial `$declarations` prop of the object by calling add_declarations().
+	 *
+	 * @since 6.1.0
+	 *
+	 * @param string[] $declarations Optional. An associative array of CSS definitions,
+	 *                               e.g. `array( "$property" => "$value", "$property" => "$value" )`.
+	 *                               Default empty array.
+	 */
+	public function __construct( $declarations = array() ) {
+		$this->add_declarations( $declarations );
+	}
+
+	/**
+	 * Adds a single declaration.
+	 *
+	 * @since 6.1.0
+	 *
+	 * @param string $property The CSS property.
+	 * @param string $value    The CSS value.
+	 * @return WP_Style_Engine_CSS_Declarations Returns the object to allow chaining methods.
+	 */
+	public function add_declaration( $property, $value ) {
+		// Sanitizes the property.
+		$property = $this->sanitize_property( $property );
+		// Bails early if the property is empty.
+		if ( empty( $property ) ) {
+			return $this;
+		}
+
+		// Trims the value. If empty, bail early.
+		$value = trim( $value );
+		if ( '' === $value ) {
+			return $this;
+		}
+
+		// Adds the declaration property/value pair.
+		$this->declarations[ $property ] = $value;
+
+		return $this;
+	}
+
+	/**
+	 * Removes a single declaration.
+	 *
+	 * @since 6.1.0
+	 *
+	 * @param string $property The CSS property.
+	 * @return WP_Style_Engine_CSS_Declarations Returns the object to allow chaining methods.
+	 */
+	public function remove_declaration( $property ) {
+		unset( $this->declarations[ $property ] );
+		return $this;
+	}
+
+	/**
+	 * Adds multiple declarations.
+	 *
+	 * @since 6.1.0
+	 *
+	 * @param string[] $declarations An array of declarations.
+	 * @return WP_Style_Engine_CSS_Declarations Returns the object to allow chaining methods.
+	 */
+	public function add_declarations( $declarations ) {
+		foreach ( $declarations as $property => $value ) {
+			$this->add_declaration( $property, $value );
+		}
+		return $this;
+	}
+
+	/**
+	 * Removes multiple declarations.
+	 *
+	 * @since 6.1.0
+	 *
+	 * @param string[] $properties Optional. An array of properties. Default empty array.
+	 * @return WP_Style_Engine_CSS_Declarations Returns the object to allow chaining methods.
+	 */
+	public function remove_declarations( $properties = array() ) {
+		foreach ( $properties as $property ) {
+			$this->remove_declaration( $property );
+		}
+		return $this;
+	}
+
+	/**
+	 * Gets the declarations array.
+	 *
+	 * @since 6.1.0
+	 *
+	 * @return string[] The declarations array.
+	 */
+	public function get_declarations() {
+		return $this->declarations;
+	}
+
+	/**
+	 * Filters a CSS property + value pair.
+	 *
+	 * @since 6.1.0
+	 *
+	 * @param string $property The CSS property.
+	 * @param string $value    The value to be filtered.
+	 * @param string $spacer   Optional. The spacer between the colon and the value.
+	 *                         Default empty string.
+	 * @return string The filtered declaration or an empty string.
+	 */
+	protected static function filter_declaration( $property, $value, $spacer = '' ) {
+		$filtered_value = wp_strip_all_tags( $value, true );
+		if ( '' !== $filtered_value ) {
+			return safecss_filter_attr( "{$property}:{$spacer}{$filtered_value}" );
+		}
+		return '';
+	}
+
+	/**
+	 * Filters and compiles the CSS declarations.
+	 *
+	 * @since 6.1.0
+	 *
+	 * @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 The CSS declarations.
+	 */
+	public function get_declarations_string( $should_prettify = false, $indent_count = 0 ) {
+		$declarations_array  = $this->get_declarations();
+		$declarations_output = '';
+		$indent              = $should_prettify ? str_repeat( "\t", $indent_count ) : '';
+		$suffix              = $should_prettify ? ' ' : '';
+		$suffix              = $should_prettify && $indent_count > 0 ? "\n" : $suffix;
+		$spacer              = $should_prettify ? ' ' : '';
+
+		foreach ( $declarations_array as $property => $value ) {
+			$filtered_declaration = static::filter_declaration( $property, $value, $spacer );
+			if ( $filtered_declaration ) {
+				$declarations_output .= "{$indent}{$filtered_declaration};$suffix";
+			}
+		}
+
+		return rtrim( $declarations_output );
+	}
+
+	/**
+	 * Sanitizes property names.
+	 *
+	 * @since 6.1.0
+	 *
+	 * @param string $property The CSS property.
+	 * @return string The sanitized property name.
+	 */
+	protected function sanitize_property( $property ) {
+		return sanitize_key( $property );
+	}
+}
diff --git a/wp-includes/style-engine/class-wp-style-engine-css-rule.php b/wp-includes/style-engine/class-wp-style-engine-css-rule.php
new file mode 100644
index 0000000..2b31cff
--- /dev/null
+++ b/wp-includes/style-engine/class-wp-style-engine-css-rule.php
@@ -0,0 +1,139 @@
+<?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;
+
+	/**
+	 * Constructor.
+	 *
+	 * @since 6.1.0
+	 *
+	 * @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.
+	 */
+	public function __construct( $selector = '', $declarations = array() ) {
+		$this->set_selector( $selector );
+		$this->add_declarations( $declarations );
+	}
+
+	/**
+	 * 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
+	 *
+	 * @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;
+
+		if ( null === $this->declarations ) {
+			if ( $is_declarations_object ) {
+				$this->declarations = $declarations;
+				return $this;
+			}
+			$this->declarations = new WP_Style_Engine_CSS_Declarations( $declarations_array );
+		}
+		$this->declarations->add_declarations( $declarations_array );
+
+		return $this;
+	}
+
+	/**
+	 * 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
+	 *
+	 * @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 ) : '';
+		$declarations_indent = $should_prettify ? $indent_count + 1 : 0;
+		$suffix              = $should_prettify ? "\n" : '';
+		$spacer              = $should_prettify ? ' ' : '';
+		$selector            = $should_prettify ? str_replace( ',', ",\n", $this->get_selector() ) : $this->get_selector();
+		$css_declarations    = $this->declarations->get_declarations_string( $should_prettify, $declarations_indent );
+
+		if ( empty( $css_declarations ) ) {
+			return '';
+		}
+
+		return "{$rule_indent}{$selector}{$spacer}{{$suffix}{$css_declarations}{$suffix}{$rule_indent}}";
+	}
+}
diff --git a/wp-includes/style-engine/class-wp-style-engine-css-rules-store.php b/wp-includes/style-engine/class-wp-style-engine-css-rules-store.php
new file mode 100644
index 0000000..371e59f
--- /dev/null
+++ b/wp-includes/style-engine/class-wp-style-engine-css-rules-store.php
@@ -0,0 +1,155 @@
+<?php
+/**
+ * Style Engine: WP_Style_Engine_CSS_Rules_Store class
+ *
+ * @package WordPress
+ * @subpackage StyleEngine
+ * @since 6.1.0
+ */
+
+/**
+ * Core class used as a store for WP_Style_Engine_CSS_Rule objects.
+ *
+ * Holds, sanitizes, processes, and prints CSS declarations for the style engine.
+ *
+ * @since 6.1.0
+ */
+#[AllowDynamicProperties]
+class WP_Style_Engine_CSS_Rules_Store {
+
+	/**
+	 * An array of named WP_Style_Engine_CSS_Rules_Store objects.
+	 *
+	 * @static
+	 *
+	 * @since 6.1.0
+	 * @var WP_Style_Engine_CSS_Rules_Store[]
+	 */
+	protected static $stores = array();
+
+	/**
+	 * The store name.
+	 *
+	 * @since 6.1.0
+	 * @var string
+	 */
+	protected $name = '';
+
+	/**
+	 * An array of CSS Rules objects assigned to the store.
+	 *
+	 * @since 6.1.0
+	 * @var WP_Style_Engine_CSS_Rule[]
+	 */
+	protected $rules = array();
+
+	/**
+	 * Gets an instance of the store.
+	 *
+	 * @since 6.1.0
+	 *
+	 * @param string $store_name The name of the store.
+	 * @return WP_Style_Engine_CSS_Rules_Store|void
+	 */
+	public static function get_store( $store_name = 'default' ) {
+		if ( ! is_string( $store_name ) || empty( $store_name ) ) {
+			return;
+		}
+		if ( ! isset( static::$stores[ $store_name ] ) ) {
+			static::$stores[ $store_name ] = new static();
+			// Set the store name.
+			static::$stores[ $store_name ]->set_name( $store_name );
+		}
+		return static::$stores[ $store_name ];
+	}
+
+	/**
+	 * Gets an array of all available stores.
+	 *
+	 * @since 6.1.0
+	 *
+	 * @return WP_Style_Engine_CSS_Rules_Store[]
+	 */
+	public static function get_stores() {
+		return static::$stores;
+	}
+
+	/**
+	 * Clears all stores from static::$stores.
+	 *
+	 * @since 6.1.0
+	 */
+	public static function remove_all_stores() {
+		static::$stores = array();
+	}
+
+	/**
+	 * Sets the store name.
+	 *
+	 * @since 6.1.0
+	 *
+	 * @param string $name The store name.
+	 */
+	public function set_name( $name ) {
+		$this->name = $name;
+	}
+
+	/**
+	 * Gets the store name.
+	 *
+	 * @since 6.1.0
+	 *
+	 * @return string
+	 */
+	public function get_name() {
+		return $this->name;
+	}
+
+	/**
+	 * Gets an array of all rules.
+	 *
+	 * @since 6.1.0
+	 *
+	 * @return WP_Style_Engine_CSS_Rule[]
+	 */
+	public function get_all_rules() {
+		return $this->rules;
+	}
+
+	/**
+	 * Gets a WP_Style_Engine_CSS_Rule object by its selector.
+	 * If the rule does not exist, it will be created.
+	 *
+	 * @since 6.1.0
+	 *
+	 * @param string $selector The CSS selector.
+	 * @return WP_Style_Engine_CSS_Rule|void Returns a WP_Style_Engine_CSS_Rule object,
+	 *                                       or void if the selector is empty.
+	 */
+	public function add_rule( $selector ) {
+		$selector = trim( $selector );
+
+		// Bail early if there is no selector.
+		if ( empty( $selector ) ) {
+			return;
+		}
+
+		// Create the rule if it doesn't exist.
+		if ( empty( $this->rules[ $selector ] ) ) {
+			$this->rules[ $selector ] = new WP_Style_Engine_CSS_Rule( $selector );
+		}
+
+		return $this->rules[ $selector ];
+	}
+
+	/**
+	 * Removes a selector from the store.
+	 *
+	 * @since 6.1.0
+	 *
+	 * @param string $selector The CSS selector.
+	 */
+	public function remove_rule( $selector ) {
+		unset( $this->rules[ $selector ] );
+	}
+}
diff --git a/wp-includes/style-engine/class-wp-style-engine-processor.php b/wp-includes/style-engine/class-wp-style-engine-processor.php
new file mode 100644
index 0000000..0778748
--- /dev/null
+++ b/wp-includes/style-engine/class-wp-style-engine-processor.php
@@ -0,0 +1,162 @@
+<?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
+	 *
+	 * @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
+	 * @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 ) {
+			$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 );
+		}
+	}
+}
diff --git a/wp-includes/style-engine/class-wp-style-engine.php b/wp-includes/style-engine/class-wp-style-engine.php
new file mode 100644
index 0000000..121bac2
--- /dev/null
+++ b/wp-includes/style-engine/class-wp-style-engine.php
@@ -0,0 +1,691 @@
+<?php
+/**
+ * Style Engine: WP_Style_Engine class
+ *
+ * @package WordPress
+ * @subpackage StyleEngine
+ * @since 6.1.0
+ */
+
+/**
+ * The main class integrating all other WP_Style_Engine_* classes.
+ *
+ * The Style Engine aims to provide a consistent API for rendering styling for blocks
+ * across both client-side and server-side applications.
+ *
+ * This class is final and should not be extended.
+ *
+ * This class is for internal Core usage and is not supposed to be used by extenders
+ * (plugins and/or themes). This is a low-level API that may need to do breaking changes.
+ * Please, use wp_style_engine_get_styles() instead.
+ *
+ * @access private
+ * @since 6.1.0
+ * @since 6.3.0 Added support for text-columns.
+ * @since 6.4.0 Added support for background.backgroundImage.
+ */
+#[AllowDynamicProperties]
+final class WP_Style_Engine {
+	/**
+	 * Style definitions that contain the instructions to parse/output valid Gutenberg styles from a block's attributes.
+	 *
+	 * For every style definition, the following properties are valid:
+	 *
+	 *  - classnames    => (array) an array of classnames to be returned for block styles. The key is a classname or pattern.
+	 *                    A value of `true` means the classname should be applied always. Otherwise, a valid CSS property (string)
+	 *                    to match the incoming value, e.g., "color" to match var:preset|color|somePresetSlug.
+	 *  - css_vars      => (array) an array of key value pairs used to generate CSS var values.
+	 *                     The key should be the CSS property name that matches the second element of the preset string value,
+	 *                     i.e., "color" in var:preset|color|somePresetSlug. The value is a CSS var pattern (e.g. `--wp--preset--color--$slug`),
+	 *                     whose `$slug` fragment will be replaced with the preset slug, which is the third element of the preset string value,
+	 *                     i.e., `somePresetSlug` in var:preset|color|somePresetSlug.
+	 *  - property_keys => (array) array of keys whose values represent a valid CSS property, e.g., "margin" or "border".
+	 *  - path          => (array) a path that accesses the corresponding style value in the block style object.
+	 *  - value_func    => (string) the name of a function to generate a CSS definition array for a particular style object. The output of this function should be `array( "$property" => "$value", ... )`.
+	 *
+	 * @since 6.1.0
+	 * @var array
+	 */
+	const BLOCK_STYLE_DEFINITIONS_METADATA = array(
+		'background' => array(
+			'backgroundImage' => array(
+				'property_keys' => array(
+					'default' => 'background-image',
+				),
+				'value_func'    => array( self::class, 'get_url_or_value_css_declaration' ),
+				'path'          => array( 'background', 'backgroundImage' ),
+			),
+			'backgroundSize'  => array(
+				'property_keys' => array(
+					'default' => 'background-size',
+				),
+				'path'          => array( 'background', 'backgroundSize' ),
+			),
+		),
+		'color'      => array(
+			'text'       => array(
+				'property_keys' => array(
+					'default' => 'color',
+				),
+				'path'          => array( 'color', 'text' ),
+				'css_vars'      => array(
+					'color' => '--wp--preset--color--$slug',
+				),
+				'classnames'    => array(
+					'has-text-color'  => true,
+					'has-$slug-color' => 'color',
+				),
+			),
+			'background' => array(
+				'property_keys' => array(
+					'default' => 'background-color',
+				),
+				'path'          => array( 'color', 'background' ),
+				'css_vars'      => array(
+					'color' => '--wp--preset--color--$slug',
+				),
+				'classnames'    => array(
+					'has-background'             => true,
+					'has-$slug-background-color' => 'color',
+				),
+			),
+			'gradient'   => array(
+				'property_keys' => array(
+					'default' => 'background',
+				),
+				'path'          => array( 'color', 'gradient' ),
+				'css_vars'      => array(
+					'gradient' => '--wp--preset--gradient--$slug',
+				),
+				'classnames'    => array(
+					'has-background'                => true,
+					'has-$slug-gradient-background' => 'gradient',
+				),
+			),
+		),
+		'border'     => array(
+			'color'  => array(
+				'property_keys' => array(
+					'default'    => 'border-color',
+					'individual' => 'border-%s-color',
+				),
+				'path'          => array( 'border', 'color' ),
+				'classnames'    => array(
+					'has-border-color'       => true,
+					'has-$slug-border-color' => 'color',
+				),
+			),
+			'radius' => array(
+				'property_keys' => array(
+					'default'    => 'border-radius',
+					'individual' => 'border-%s-radius',
+				),
+				'path'          => array( 'border', 'radius' ),
+			),
+			'style'  => array(
+				'property_keys' => array(
+					'default'    => 'border-style',
+					'individual' => 'border-%s-style',
+				),
+				'path'          => array( 'border', 'style' ),
+			),
+			'width'  => array(
+				'property_keys' => array(
+					'default'    => 'border-width',
+					'individual' => 'border-%s-width',
+				),
+				'path'          => array( 'border', 'width' ),
+			),
+			'top'    => array(
+				'value_func' => array( self::class, 'get_individual_property_css_declarations' ),
+				'path'       => array( 'border', 'top' ),
+				'css_vars'   => array(
+					'color' => '--wp--preset--color--$slug',
+				),
+			),
+			'right'  => array(
+				'value_func' => array( self::class, 'get_individual_property_css_declarations' ),
+				'path'       => array( 'border', 'right' ),
+				'css_vars'   => array(
+					'color' => '--wp--preset--color--$slug',
+				),
+			),
+			'bottom' => array(
+				'value_func' => array( self::class, 'get_individual_property_css_declarations' ),
+				'path'       => array( 'border', 'bottom' ),
+				'css_vars'   => array(
+					'color' => '--wp--preset--color--$slug',
+				),
+			),
+			'left'   => array(
+				'value_func' => array( self::class, 'get_individual_property_css_declarations' ),
+				'path'       => array( 'border', 'left' ),
+				'css_vars'   => array(
+					'color' => '--wp--preset--color--$slug',
+				),
+			),
+		),
+		'shadow'     => array(
+			'shadow' => array(
+				'property_keys' => array(
+					'default' => 'box-shadow',
+				),
+				'path'          => array( 'shadow' ),
+				'css_vars'      => array(
+					'shadow' => '--wp--preset--shadow--$slug',
+				),
+			),
+		),
+		'dimensions' => array(
+			'minHeight' => array(
+				'property_keys' => array(
+					'default' => 'min-height',
+				),
+				'path'          => array( 'dimensions', 'minHeight' ),
+				'css_vars'      => array(
+					'spacing' => '--wp--preset--spacing--$slug',
+				),
+			),
+		),
+		'spacing'    => array(
+			'padding' => array(
+				'property_keys' => array(
+					'default'    => 'padding',
+					'individual' => 'padding-%s',
+				),
+				'path'          => array( 'spacing', 'padding' ),
+				'css_vars'      => array(
+					'spacing' => '--wp--preset--spacing--$slug',
+				),
+			),
+			'margin'  => array(
+				'property_keys' => array(
+					'default'    => 'margin',
+					'individual' => 'margin-%s',
+				),
+				'path'          => array( 'spacing', 'margin' ),
+				'css_vars'      => array(
+					'spacing' => '--wp--preset--spacing--$slug',
+				),
+			),
+		),
+		'typography' => array(
+			'fontSize'       => array(
+				'property_keys' => array(
+					'default' => 'font-size',
+				),
+				'path'          => array( 'typography', 'fontSize' ),
+				'classnames'    => array(
+					'has-$slug-font-size' => 'font-size',
+				),
+			),
+			'fontFamily'     => array(
+				'property_keys' => array(
+					'default' => 'font-family',
+				),
+				'path'          => array( 'typography', 'fontFamily' ),
+				'classnames'    => array(
+					'has-$slug-font-family' => 'font-family',
+				),
+			),
+			'fontStyle'      => array(
+				'property_keys' => array(
+					'default' => 'font-style',
+				),
+				'path'          => array( 'typography', 'fontStyle' ),
+			),
+			'fontWeight'     => array(
+				'property_keys' => array(
+					'default' => 'font-weight',
+				),
+				'path'          => array( 'typography', 'fontWeight' ),
+			),
+			'lineHeight'     => array(
+				'property_keys' => array(
+					'default' => 'line-height',
+				),
+				'path'          => array( 'typography', 'lineHeight' ),
+			),
+			'textColumns'    => array(
+				'property_keys' => array(
+					'default' => 'column-count',
+				),
+				'path'          => array( 'typography', 'textColumns' ),
+			),
+			'textDecoration' => array(
+				'property_keys' => array(
+					'default' => 'text-decoration',
+				),
+				'path'          => array( 'typography', 'textDecoration' ),
+			),
+			'textTransform'  => array(
+				'property_keys' => array(
+					'default' => 'text-transform',
+				),
+				'path'          => array( 'typography', 'textTransform' ),
+			),
+			'letterSpacing'  => array(
+				'property_keys' => array(
+					'default' => 'letter-spacing',
+				),
+				'path'          => array( 'typography', 'letterSpacing' ),
+			),
+		),
+	);
+
+	/**
+	 * Util: Extracts the slug in kebab case from a preset string,
+	 * e.g. `heavenly-blue` from `var:preset|color|heavenlyBlue`.
+	 *
+	 * @since 6.1.0
+	 *
+	 * @param string $style_value  A single CSS preset value.
+	 * @param string $property_key The CSS property that is the second element of the preset string.
+	 *                             Used for matching.
+	 * @return string The slug, or empty string if not found.
+	 */
+	protected static function get_slug_from_preset_value( $style_value, $property_key ) {
+		if ( is_string( $style_value ) && is_string( $property_key )
+			&& str_contains( $style_value, "var:preset|{$property_key}|" )
+		) {
+			$index_to_splice = strrpos( $style_value, '|' ) + 1;
+			return _wp_to_kebab_case( substr( $style_value, $index_to_splice ) );
+		}
+		return '';
+	}
+
+	/**
+	 * Util: Generates a CSS var string, e.g. `var(--wp--preset--color--background)`
+	 * from a preset string such as `var:preset|space|50`.
+	 *
+	 * @since 6.1.0
+	 *
+	 * @param string   $style_value  A single CSS preset value.
+	 * @param string[] $css_vars     An associate array of CSS var patterns
+	 *                               used to generate the var string.
+	 * @return string The CSS var, or an empty string if no match for slug found.
+	 */
+	protected static function get_css_var_value( $style_value, $css_vars ) {
+		foreach ( $css_vars as $property_key => $css_var_pattern ) {
+			$slug = static::get_slug_from_preset_value( $style_value, $property_key );
+			if ( static::is_valid_style_value( $slug ) ) {
+				$var = strtr(
+					$css_var_pattern,
+					array( '$slug' => $slug )
+				);
+				return "var($var)";
+			}
+		}
+		return '';
+	}
+
+	/**
+	 * Util: Checks whether an incoming block style value is valid.
+	 *
+	 * @since 6.1.0
+	 *
+	 * @param string $style_value A single CSS preset value.
+	 * @return bool
+	 */
+	protected static function is_valid_style_value( $style_value ) {
+		return '0' === $style_value || ! empty( $style_value );
+	}
+
+	/**
+	 * Stores a CSS rule using the provided CSS selector and CSS declarations.
+	 *
+	 * @since 6.1.0
+	 *
+	 * @param string   $store_name       A valid store key.
+	 * @param string   $css_selector     When a selector is passed, the function will return
+	 *                                   a full CSS rule `$selector { ...rules }`
+	 *                                   otherwise a concatenated string of properties and values.
+	 * @param string[] $css_declarations An associative array of CSS definitions,
+	 *                                   e.g. `array( "$property" => "$value", "$property" => "$value" )`.
+	 */
+	public static function store_css_rule( $store_name, $css_selector, $css_declarations ) {
+		if ( empty( $store_name ) || empty( $css_selector ) || empty( $css_declarations ) ) {
+			return;
+		}
+		static::get_store( $store_name )->add_rule( $css_selector )->add_declarations( $css_declarations );
+	}
+
+	/**
+	 * Returns a store by store key.
+	 *
+	 * @since 6.1.0
+	 *
+	 * @param string $store_name A store key.
+	 * @return WP_Style_Engine_CSS_Rules_Store|null
+	 */
+	public static function get_store( $store_name ) {
+		return WP_Style_Engine_CSS_Rules_Store::get_store( $store_name );
+	}
+
+	/**
+	 * Returns classnames and CSS based on the values in a styles object.
+	 *
+	 * Return values are parsed based on the instructions in BLOCK_STYLE_DEFINITIONS_METADATA.
+	 *
+	 * @since 6.1.0
+	 *
+	 * @param array $block_styles The style object.
+	 * @param array $options      {
+	 *     Optional. An array of options. Default empty array.
+	 *
+	 *     @type bool        $convert_vars_to_classnames Whether to skip converting incoming CSS var patterns,
+	 *                                                   e.g. `var:preset|<PRESET_TYPE>|<PRESET_SLUG>`,
+	 *                                                   to `var( --wp--preset--* )` values. Default false.
+	 *     @type string      $selector                   Optional. When a selector is passed,
+	 *                                                   the value of `$css` in the return value will comprise
+	 *                                                   a full CSS rule `$selector { ...$css_declarations }`,
+	 *                                                   otherwise, the value will be a concatenated string
+	 *                                                   of CSS declarations.
+	 * }
+	 * @return array {
+	 *     @type string[] $classnames   Array of class names.
+	 *     @type string[] $declarations An associative array of CSS definitions,
+	 *                                  e.g. `array( "$property" => "$value", "$property" => "$value" )`.
+	 * }
+	 */
+	public static function parse_block_styles( $block_styles, $options ) {
+		$parsed_styles = array(
+			'classnames'   => array(),
+			'declarations' => array(),
+		);
+		if ( empty( $block_styles ) || ! is_array( $block_styles ) ) {
+			return $parsed_styles;
+		}
+
+		// Collect CSS and classnames.
+		foreach ( static::BLOCK_STYLE_DEFINITIONS_METADATA as $definition_group_key => $definition_group_style ) {
+			if ( empty( $block_styles[ $definition_group_key ] ) ) {
+				continue;
+			}
+			foreach ( $definition_group_style as $style_definition ) {
+				$style_value = _wp_array_get( $block_styles, $style_definition['path'], null );
+
+				if ( ! static::is_valid_style_value( $style_value ) ) {
+					continue;
+				}
+
+				$parsed_styles['classnames']   = array_merge( $parsed_styles['classnames'], static::get_classnames( $style_value, $style_definition ) );
+				$parsed_styles['declarations'] = array_merge( $parsed_styles['declarations'], static::get_css_declarations( $style_value, $style_definition, $options ) );
+			}
+		}
+
+		return $parsed_styles;
+	}
+
+	/**
+	 * Returns classnames, and generates classname(s) from a CSS preset property pattern,
+	 * e.g. `var:preset|<PRESET_TYPE>|<PRESET_SLUG>`.
+	 *
+	 * @since 6.1.0
+	 *
+	 * @param string $style_value      A single raw style value or CSS preset property
+	 *                                 from the `$block_styles` array.
+	 * @param array  $style_definition A single style definition from BLOCK_STYLE_DEFINITIONS_METADATA.
+	 * @return string[] An array of CSS classnames, or empty array if there are none.
+	 */
+	protected static function get_classnames( $style_value, $style_definition ) {
+		if ( empty( $style_value ) ) {
+			return array();
+		}
+
+		$classnames = array();
+		if ( ! empty( $style_definition['classnames'] ) ) {
+			foreach ( $style_definition['classnames'] as $classname => $property_key ) {
+				if ( true === $property_key ) {
+					$classnames[] = $classname;
+				}
+
+				$slug = static::get_slug_from_preset_value( $style_value, $property_key );
+
+				if ( $slug ) {
+					/*
+					 * Right now we expect a classname pattern to be stored in BLOCK_STYLE_DEFINITIONS_METADATA.
+					 * One day, if there are no stored schemata, we could allow custom patterns or
+					 * generate classnames based on other properties
+					 * such as a path or a value or a prefix passed in options.
+					 */
+					$classnames[] = strtr( $classname, array( '$slug' => $slug ) );
+				}
+			}
+		}
+
+		return $classnames;
+	}
+
+	/**
+	 * Returns an array of CSS declarations based on valid block style values.
+	 *
+	 * @since 6.1.0
+	 *
+	 * @param mixed $style_value      A single raw style value from $block_styles array.
+	 * @param array $style_definition A single style definition from BLOCK_STYLE_DEFINITIONS_METADATA.
+	 * @param array $options          {
+	 *     Optional. An array of options. Default empty array.
+	 *
+	 *     @type bool $convert_vars_to_classnames Whether to skip converting incoming CSS var patterns,
+	 *                                            e.g. `var:preset|<PRESET_TYPE>|<PRESET_SLUG>`,
+	 *                                            to `var( --wp--preset--* )` values. Default false.
+	 * }
+	 * @return string[] An associative array of CSS definitions, e.g. `array( "$property" => "$value", "$property" => "$value" )`.
+	 */
+	protected static function get_css_declarations( $style_value, $style_definition, $options = array() ) {
+		if ( isset( $style_definition['value_func'] ) && is_callable( $style_definition['value_func'] ) ) {
+			return call_user_func( $style_definition['value_func'], $style_value, $style_definition, $options );
+		}
+
+		$css_declarations     = array();
+		$style_property_keys  = $style_definition['property_keys'];
+		$should_skip_css_vars = isset( $options['convert_vars_to_classnames'] ) && true === $options['convert_vars_to_classnames'];
+
+		/*
+		 * Build CSS var values from `var:preset|<PRESET_TYPE>|<PRESET_SLUG>` values, e.g, `var(--wp--css--rule-slug )`.
+		 * Check if the value is a CSS preset and there's a corresponding css_var pattern in the style definition.
+		 */
+		if ( is_string( $style_value ) && str_contains( $style_value, 'var:' ) ) {
+			if ( ! $should_skip_css_vars && ! empty( $style_definition['css_vars'] ) ) {
+				$css_var = static::get_css_var_value( $style_value, $style_definition['css_vars'] );
+				if ( static::is_valid_style_value( $css_var ) ) {
+					$css_declarations[ $style_property_keys['default'] ] = $css_var;
+				}
+			}
+			return $css_declarations;
+		}
+
+		/*
+		 * Default rule builder.
+		 * If the input contains an array, assume box model-like properties
+		 * for styles such as margins and padding.
+		 */
+		if ( is_array( $style_value ) ) {
+			// Bail out early if the `'individual'` property is not defined.
+			if ( ! isset( $style_property_keys['individual'] ) ) {
+				return $css_declarations;
+			}
+
+			foreach ( $style_value as $key => $value ) {
+				if ( is_string( $value ) && str_contains( $value, 'var:' ) && ! $should_skip_css_vars && ! empty( $style_definition['css_vars'] ) ) {
+					$value = static::get_css_var_value( $value, $style_definition['css_vars'] );
+				}
+
+				$individual_property = sprintf( $style_property_keys['individual'], _wp_to_kebab_case( $key ) );
+
+				if ( $individual_property && static::is_valid_style_value( $value ) ) {
+					$css_declarations[ $individual_property ] = $value;
+				}
+			}
+
+			return $css_declarations;
+		}
+
+		$css_declarations[ $style_property_keys['default'] ] = $style_value;
+		return $css_declarations;
+	}
+
+	/**
+	 * Style value parser that returns a CSS definition array comprising style properties
+	 * that have keys representing individual style properties, otherwise known as longhand CSS properties.
+	 *
+	 * Example:
+	 *
+	 *     "$style_property-$individual_feature: $value;"
+	 *
+	 * Which could represent the following:
+	 *
+	 *     "border-{top|right|bottom|left}-{color|width|style}: {value};"
+	 *
+	 * or:
+	 *
+	 *     "border-image-{outset|source|width|repeat|slice}: {value};"
+	 *
+	 * @since 6.1.0
+	 *
+	 * @param array $style_value                    A single raw style value from `$block_styles` array.
+	 * @param array $individual_property_definition A single style definition from BLOCK_STYLE_DEFINITIONS_METADATA
+	 *                                              representing an individual property of a CSS property,
+	 *                                              e.g. 'top' in 'border-top'.
+	 * @param array $options                        {
+	 *     Optional. An array of options. Default empty array.
+	 *
+	 *     @type bool $convert_vars_to_classnames Whether to skip converting incoming CSS var patterns,
+	 *                                            e.g. `var:preset|<PRESET_TYPE>|<PRESET_SLUG>`,
+	 *                                            to `var( --wp--preset--* )` values. Default false.
+	 * }
+	 * @return string[] An associative array of CSS definitions, e.g. `array( "$property" => "$value", "$property" => "$value" )`.
+	 */
+	protected static function get_individual_property_css_declarations( $style_value, $individual_property_definition, $options = array() ) {
+		if ( ! is_array( $style_value ) || empty( $style_value ) || empty( $individual_property_definition['path'] ) ) {
+			return array();
+		}
+
+		/*
+		 * The first item in $individual_property_definition['path'] array
+		 * tells us the style property, e.g. "border". We use this to get a corresponding
+		 * CSS style definition such as "color" or "width" from the same group.
+		 *
+		 * The second item in $individual_property_definition['path'] array
+		 * refers to the individual property marker, e.g. "top".
+		 */
+		$definition_group_key    = $individual_property_definition['path'][0];
+		$individual_property_key = $individual_property_definition['path'][1];
+		$should_skip_css_vars    = isset( $options['convert_vars_to_classnames'] ) && true === $options['convert_vars_to_classnames'];
+		$css_declarations        = array();
+
+		foreach ( $style_value as $css_property => $value ) {
+			if ( empty( $value ) ) {
+				continue;
+			}
+
+			// Build a path to the individual rules in definitions.
+			$style_definition_path = array( $definition_group_key, $css_property );
+			$style_definition      = _wp_array_get( static::BLOCK_STYLE_DEFINITIONS_METADATA, $style_definition_path, null );
+
+			if ( $style_definition && isset( $style_definition['property_keys']['individual'] ) ) {
+				// Set a CSS var if there is a valid preset value.
+				if ( is_string( $value ) && str_contains( $value, 'var:' )
+					&& ! $should_skip_css_vars && ! empty( $individual_property_definition['css_vars'] )
+				) {
+					$value = static::get_css_var_value( $value, $individual_property_definition['css_vars'] );
+				}
+
+				$individual_css_property = sprintf( $style_definition['property_keys']['individual'], $individual_property_key );
+
+				$css_declarations[ $individual_css_property ] = $value;
+			}
+		}
+		return $css_declarations;
+	}
+
+	/**
+	 * Style value parser that constructs a CSS definition array comprising a single CSS property and value.
+	 * If the provided value is an array containing a `url` property, the function will return a CSS definition array
+	 * with a single property and value, with `url` escaped and injected into a CSS `url()` function,
+	 * e.g., array( 'background-image' => "url( '...' )" ).
+	 *
+	 * @since 6.4.0
+	 *
+	 * @param array $style_value      A single raw style value from $block_styles array.
+	 * @param array $style_definition A single style definition from BLOCK_STYLE_DEFINITIONS_METADATA.
+	 * @return string[] An associative array of CSS definitions, e.g., array( "$property" => "$value", "$property" => "$value" ).
+	 */
+	protected static function get_url_or_value_css_declaration( $style_value, $style_definition ) {
+		if ( empty( $style_value ) ) {
+			return array();
+		}
+
+		$css_declarations = array();
+
+		if ( isset( $style_definition['property_keys']['default'] ) ) {
+			$value = null;
+
+			if ( ! empty( $style_value['url'] ) ) {
+				$value = "url('" . $style_value['url'] . "')";
+			} elseif ( is_string( $style_value ) ) {
+				$value = $style_value;
+			}
+
+			if ( null !== $value ) {
+				$css_declarations[ $style_definition['property_keys']['default'] ] = $value;
+			}
+		}
+
+		return $css_declarations;
+	}
+
+	/**
+	 * Returns compiled CSS from CSS declarations.
+	 *
+	 * @since 6.1.0
+	 *
+	 * @param string[] $css_declarations An associative array of CSS definitions,
+	 *                                   e.g. `array( "$property" => "$value", "$property" => "$value" )`.
+	 * @param string   $css_selector     When a selector is passed, the function will return
+	 *                                   a full CSS rule `$selector { ...rules }`,
+	 *                                   otherwise a concatenated string of properties and values.
+	 * @return string A compiled CSS string.
+	 */
+	public static function compile_css( $css_declarations, $css_selector ) {
+		if ( empty( $css_declarations ) || ! is_array( $css_declarations ) ) {
+			return '';
+		}
+
+		// Return an entire rule if there is a selector.
+		if ( $css_selector ) {
+			$css_rule = new WP_Style_Engine_CSS_Rule( $css_selector, $css_declarations );
+			return $css_rule->get_css();
+		}
+
+		$css_declarations = new WP_Style_Engine_CSS_Declarations( $css_declarations );
+		return $css_declarations->get_declarations_string();
+	}
+
+	/**
+	 * Returns a compiled stylesheet from stored CSS rules.
+	 *
+	 * @since 6.1.0
+	 *
+	 * @param WP_Style_Engine_CSS_Rule[] $css_rules An array of WP_Style_Engine_CSS_Rule objects
+	 *                                              from a store or otherwise.
+	 * @param array                      $options   {
+	 *     Optional. An array of options. Default empty array.
+	 *
+	 *     @type string|null $context  An identifier describing the origin of the style object,
+	 *                                 e.g. 'block-supports' or 'global-styles'. Default 'block-supports'.
+	 *                                 When set, the style engine will attempt to store the CSS rules.
+	 *     @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 A compiled stylesheet from stored CSS rules.
+	 */
+	public static function compile_stylesheet_from_css_rules( $css_rules, $options = array() ) {
+		$processor = new WP_Style_Engine_Processor();
+		$processor->add_rules( $css_rules );
+		return $processor->get_css( $options );
+	}
+}