WP_Theme_JSON{}WP 1.0AllowDynamicProperties

Class that encapsulates the processing of structures that adhere to the theme.json spec.

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 get_global_settings, get_global_styles, and get_global_stylesheet instead.

Internal function — this function is designed to be used by the kernel itself. It is not recommended to use this function in your code.

Hooks from the class

Usage

$WP_Theme_JSON = new WP_Theme_JSON();
// use class methods

Methods

  1. public __construct( $theme_json = array(), $origin = 'theme' )
  2. protected static append_to_selector( $selector, $to_append )
  3. protected static compute_preset_classes( $settings, $selector, $origins )
  4. protected static compute_preset_vars( $settings, $origins )
  5. protected static compute_style_properties( $styles, $settings = array(), $properties = null, $theme_json = null, $selector = null, $use_root_padding = null )
  6. protected static compute_theme_vars( $settings )
  7. private static convert_custom_properties( $value )
  8. private static convert_variables_to_value( $styles, $values )
  9. protected static do_opt_in_into_settings( &$context )
  10. protected static filter_slugs( $node, $slugs )
  11. protected static flatten_tree( $tree, $prefix = '', $token = '--' )
  12. protected get_block_classes( $style_nodes )
  13. protected static get_block_element_selectors( $root_selector )
  14. private static get_block_nodes( $theme_json )
  15. protected static get_block_selectors( $block_type, $root_selector )
  16. protected static get_blocks_metadata()
  17. protected get_css_variables( $nodes, $origins )
  18. public get_custom_css()
  19. public get_custom_templates()
  20. public get_data()
  21. protected static get_default_slugs( $data, $node_path )
  22. public static get_element_class_name( $element )
  23. protected get_feature_declarations_for_node( $metadata, &$node )
  24. public static get_from_editor_settings( $settings )
  25. protected get_layout_styles( $block_metadata )
  26. protected static get_metadata_boolean( $data, $path, $default_value = false )
  27. protected get_name_from_defaults( $slug, $base_path )
  28. public get_patterns()
  29. protected get_preset_classes( $setting_nodes, $origins )
  30. protected static get_property_value( $styles, $path, $theme_json = null )
  31. public get_raw_data()
  32. public get_root_layout_rules( $selector, $block_metadata )
  33. protected static get_setting_nodes( $theme_json, $selectors = array() )
  34. public get_settings()
  35. protected static get_settings_slugs( $settings, $preset_metadata, $origins = null )
  36. protected static get_settings_values_by_slug( $settings, $preset_metadata, $origins )
  37. protected static get_style_nodes( $theme_json, $selectors = array() )
  38. public get_styles_block_nodes()
  39. public get_styles_for_block( $block_metadata )
  40. public get_stylesheet( $types = array( 'variables', 'styles', 'presets' ), $origins = null, $options = array() )
  41. public get_svg_filters( $origins )
  42. public get_template_parts()
  43. protected static is_safe_css_declaration( $property_name, $property_value )
  44. protected static maybe_opt_in_into_settings( $theme_json )
  45. public merge( $incoming )
  46. protected static prepend_to_selector( $selector, $to_prepend )
  47. protected process_blocks_custom_css( $css, $selector )
  48. private static remove_indirect_properties( $input, &$output )
  49. public static remove_insecure_properties( $theme_json )
  50. protected static remove_insecure_settings( $input )
  51. protected static remove_insecure_styles( $input )
  52. protected static remove_keys_not_in_schema( $tree, $schema )
  53. protected static replace_slug_in_string( $input, $slug )
  54. private static resolve_custom_css_format( $tree )
  55. public static resolve_variables( $theme_json )
  56. protected static sanitize( $input, $valid_block_names, $valid_element_names, $valid_variations )
  57. public static scope_selector( $scope, $selector )
  58. public set_spacing_sizes()
  59. protected static should_override_preset( $theme_json, $path, $override )
  60. protected static to_ruleset( $selector, $declarations )
  61. private static update_separator_declarations( $declarations )

WP_Theme_JSON{} code WP 6.4.3

class WP_Theme_JSON {

	/**
	 * Container of data in theme.json format.
	 *
	 * @since 5.8.0
	 * @var array
	 */
	protected $theme_json = null;

	/**
	 * Holds block metadata extracted from block.json
	 * to be shared among all instances so we don't
	 * process it twice.
	 *
	 * @since 5.8.0
	 * @since 6.1.0 Initialize as an empty array.
	 * @var array
	 */
	protected static $blocks_metadata = array();

	/**
	 * The CSS selector for the top-level styles.
	 *
	 * @since 5.8.0
	 * @var string
	 */
	const ROOT_BLOCK_SELECTOR = 'body';

	/**
	 * The sources of data this object can represent.
	 *
	 * @since 5.8.0
	 * @since 6.1.0 Added 'blocks'.
	 * @var string[]
	 */
	const VALID_ORIGINS = array(
		'default',
		'blocks',
		'theme',
		'custom',
	);

	/**
	 * Presets are a set of values that serve
	 * to bootstrap some styles: colors, font sizes, etc.
	 *
	 * They are a unkeyed array of values such as:
	 *
	 *     array(
	 *       array(
	 *         'slug'      => 'unique-name-within-the-set',
	 *         'name'      => 'Name for the UI',
	 *         <value_key> => 'value'
	 *       ),
	 *     )
	 *
	 * This contains the necessary metadata to process them:
	 *
	 * - path             => Where to find the preset within the settings section.
	 * - prevent_override => Disables override of default presets by theme presets.
	 *                       The relationship between whether to override the defaults
	 *                       and whether the defaults are enabled is inverse:
	 *                         - If defaults are enabled  => theme presets should not be overridden
	 *                         - If defaults are disabled => theme presets should be overridden
	 *                       For example, a theme sets defaultPalette to false,
	 *                       making the default palette hidden from the user.
	 *                       In that case, we want all the theme presets to be present,
	 *                       so they should override the defaults by setting this false.
	 * - use_default_names => whether to use the default names
	 * - value_key        => the key that represents the value
	 * - value_func       => optionally, instead of value_key, a function to generate
	 *                       the value that takes a preset as an argument
	 *                       (either value_key or value_func should be present)
	 * - css_vars         => template string to use in generating the CSS Custom Property.
	 *                       Example output: "--wp--preset--duotone--blue: <value>" will generate as many CSS Custom Properties as presets defined
	 *                       substituting the $slug for the slug's value for each preset value.
	 * - classes          => array containing a structure with the classes to
	 *                       generate for the presets, where for each array item
	 *                       the key is the class name and the value the property name.
	 *                       The "$slug" substring will be replaced by the slug of each preset.
	 *                       For example:
	 *                       'classes' => array(
	 *                         '.has-$slug-color'            => 'color',
	 *                         '.has-$slug-background-color' => 'background-color',
	 *                         '.has-$slug-border-color'     => 'border-color',
	 *                       )
	 * - properties       => array of CSS properties to be used by kses to
	 *                       validate the content of each preset
	 *                       by means of the remove_insecure_properties method.
	 *
	 * @since 5.8.0
	 * @since 5.9.0 Added the `color.duotone` and `typography.fontFamilies` presets,
	 *              `use_default_names` preset key, and simplified the metadata structure.
	 * @since 6.0.0 Replaced `override` with `prevent_override` and updated the
	 *              `prevent_override` value for `color.duotone` to use `color.defaultDuotone`.
	 * @since 6.2.0 Added 'shadow' presets.
	 * @since 6.3.0 Replaced value_func for duotone with `null`. Custom properties are handled by class-wp-duotone.php.
	 * @var array
	 */
	const PRESETS_METADATA = array(
		array(
			'path'              => array( 'color', 'palette' ),
			'prevent_override'  => array( 'color', 'defaultPalette' ),
			'use_default_names' => false,
			'value_key'         => 'color',
			'css_vars'          => '--wp--preset--color--$slug',
			'classes'           => array(
				'.has-$slug-color'            => 'color',
				'.has-$slug-background-color' => 'background-color',
				'.has-$slug-border-color'     => 'border-color',
			),
			'properties'        => array( 'color', 'background-color', 'border-color' ),
		),
		array(
			'path'              => array( 'color', 'gradients' ),
			'prevent_override'  => array( 'color', 'defaultGradients' ),
			'use_default_names' => false,
			'value_key'         => 'gradient',
			'css_vars'          => '--wp--preset--gradient--$slug',
			'classes'           => array( '.has-$slug-gradient-background' => 'background' ),
			'properties'        => array( 'background' ),
		),
		array(
			'path'              => array( 'color', 'duotone' ),
			'prevent_override'  => array( 'color', 'defaultDuotone' ),
			'use_default_names' => false,
			'value_func'        => null, // CSS Custom Properties for duotone are handled by block supports in class-wp-duotone.php.
			'css_vars'          => null,
			'classes'           => array(),
			'properties'        => array( 'filter' ),
		),
		array(
			'path'              => array( 'typography', 'fontSizes' ),
			'prevent_override'  => false,
			'use_default_names' => true,
			'value_func'        => 'wp_get_typography_font_size_value',
			'css_vars'          => '--wp--preset--font-size--$slug',
			'classes'           => array( '.has-$slug-font-size' => 'font-size' ),
			'properties'        => array( 'font-size' ),
		),
		array(
			'path'              => array( 'typography', 'fontFamilies' ),
			'prevent_override'  => false,
			'use_default_names' => false,
			'value_key'         => 'fontFamily',
			'css_vars'          => '--wp--preset--font-family--$slug',
			'classes'           => array( '.has-$slug-font-family' => 'font-family' ),
			'properties'        => array( 'font-family' ),
		),
		array(
			'path'              => array( 'spacing', 'spacingSizes' ),
			'prevent_override'  => false,
			'use_default_names' => true,
			'value_key'         => 'size',
			'css_vars'          => '--wp--preset--spacing--$slug',
			'classes'           => array(),
			'properties'        => array( 'padding', 'margin' ),
		),
		array(
			'path'              => array( 'shadow', 'presets' ),
			'prevent_override'  => array( 'shadow', 'defaultPresets' ),
			'use_default_names' => false,
			'value_key'         => 'shadow',
			'css_vars'          => '--wp--preset--shadow--$slug',
			'classes'           => array(),
			'properties'        => array( 'box-shadow' ),
		),
	);

	/**
	 * Metadata for style properties.
	 *
	 * Each element is a direct mapping from the CSS property name to the
	 * path to the value in theme.json & block attributes.
	 *
	 * @since 5.8.0
	 * @since 5.9.0 Added the `border-*`, `font-family`, `font-style`, `font-weight`,
	 *              `letter-spacing`, `margin-*`, `padding-*`, `--wp--style--block-gap`,
	 *              `text-decoration`, `text-transform`, and `filter` properties,
	 *              simplified the metadata structure.
	 * @since 6.1.0 Added the `border-*-color`, `border-*-width`, `border-*-style`,
	 *              `--wp--style--root--padding-*`, and `box-shadow` properties,
	 *              removed the `--wp--style--block-gap` property.
	 * @since 6.2.0 Added `outline-*`, and `min-height` properties.
	 * @since 6.3.0 Added `column-count` property.
	 * @since 6.4.0 Added `writing-mode` property.
	 *
	 * @var array
	 */
	const PROPERTIES_METADATA = array(
		'background'                        => array( 'color', 'gradient' ),
		'background-color'                  => array( 'color', 'background' ),
		'border-radius'                     => array( 'border', 'radius' ),
		'border-top-left-radius'            => array( 'border', 'radius', 'topLeft' ),
		'border-top-right-radius'           => array( 'border', 'radius', 'topRight' ),
		'border-bottom-left-radius'         => array( 'border', 'radius', 'bottomLeft' ),
		'border-bottom-right-radius'        => array( 'border', 'radius', 'bottomRight' ),
		'border-color'                      => array( 'border', 'color' ),
		'border-width'                      => array( 'border', 'width' ),
		'border-style'                      => array( 'border', 'style' ),
		'border-top-color'                  => array( 'border', 'top', 'color' ),
		'border-top-width'                  => array( 'border', 'top', 'width' ),
		'border-top-style'                  => array( 'border', 'top', 'style' ),
		'border-right-color'                => array( 'border', 'right', 'color' ),
		'border-right-width'                => array( 'border', 'right', 'width' ),
		'border-right-style'                => array( 'border', 'right', 'style' ),
		'border-bottom-color'               => array( 'border', 'bottom', 'color' ),
		'border-bottom-width'               => array( 'border', 'bottom', 'width' ),
		'border-bottom-style'               => array( 'border', 'bottom', 'style' ),
		'border-left-color'                 => array( 'border', 'left', 'color' ),
		'border-left-width'                 => array( 'border', 'left', 'width' ),
		'border-left-style'                 => array( 'border', 'left', 'style' ),
		'color'                             => array( 'color', 'text' ),
		'column-count'                      => array( 'typography', 'textColumns' ),
		'font-family'                       => array( 'typography', 'fontFamily' ),
		'font-size'                         => array( 'typography', 'fontSize' ),
		'font-style'                        => array( 'typography', 'fontStyle' ),
		'font-weight'                       => array( 'typography', 'fontWeight' ),
		'letter-spacing'                    => array( 'typography', 'letterSpacing' ),
		'line-height'                       => array( 'typography', 'lineHeight' ),
		'margin'                            => array( 'spacing', 'margin' ),
		'margin-top'                        => array( 'spacing', 'margin', 'top' ),
		'margin-right'                      => array( 'spacing', 'margin', 'right' ),
		'margin-bottom'                     => array( 'spacing', 'margin', 'bottom' ),
		'margin-left'                       => array( 'spacing', 'margin', 'left' ),
		'min-height'                        => array( 'dimensions', 'minHeight' ),
		'outline-color'                     => array( 'outline', 'color' ),
		'outline-offset'                    => array( 'outline', 'offset' ),
		'outline-style'                     => array( 'outline', 'style' ),
		'outline-width'                     => array( 'outline', 'width' ),
		'padding'                           => array( 'spacing', 'padding' ),
		'padding-top'                       => array( 'spacing', 'padding', 'top' ),
		'padding-right'                     => array( 'spacing', 'padding', 'right' ),
		'padding-bottom'                    => array( 'spacing', 'padding', 'bottom' ),
		'padding-left'                      => array( 'spacing', 'padding', 'left' ),
		'--wp--style--root--padding'        => array( 'spacing', 'padding' ),
		'--wp--style--root--padding-top'    => array( 'spacing', 'padding', 'top' ),
		'--wp--style--root--padding-right'  => array( 'spacing', 'padding', 'right' ),
		'--wp--style--root--padding-bottom' => array( 'spacing', 'padding', 'bottom' ),
		'--wp--style--root--padding-left'   => array( 'spacing', 'padding', 'left' ),
		'text-decoration'                   => array( 'typography', 'textDecoration' ),
		'text-transform'                    => array( 'typography', 'textTransform' ),
		'filter'                            => array( 'filter', 'duotone' ),
		'box-shadow'                        => array( 'shadow' ),
		'writing-mode'                      => array( 'typography', 'writingMode' ),
	);

	/**
	 * Indirect metadata for style properties that are not directly output.
	 *
	 * Each element maps from a CSS property name to an array of
	 * paths to the value in theme.json & block attributes.
	 *
	 * Indirect properties are not output directly by `compute_style_properties`,
	 * but are used elsewhere in the processing of global styles. The indirect
	 * property is used to validate whether or not a style value is allowed.
	 *
	 * @since 6.2.0
	 *
	 * @var array
	 */
	const INDIRECT_PROPERTIES_METADATA = array(
		'gap'        => array(
			array( 'spacing', 'blockGap' ),
		),
		'column-gap' => array(
			array( 'spacing', 'blockGap', 'left' ),
		),
		'row-gap'    => array(
			array( 'spacing', 'blockGap', 'top' ),
		),
		'max-width'  => array(
			array( 'layout', 'contentSize' ),
			array( 'layout', 'wideSize' ),
		),
	);

	/**
	 * Protected style properties.
	 *
	 * These style properties are only rendered if a setting enables it
	 * via a value other than `null`.
	 *
	 * Each element maps the style property to the corresponding theme.json
	 * setting key.
	 *
	 * @since 5.9.0
	 */
	const PROTECTED_PROPERTIES = array(
		'spacing.blockGap' => array( 'spacing', 'blockGap' ),
	);

	/**
	 * The top-level keys a theme.json can have.
	 *
	 * @since 5.8.0 As `ALLOWED_TOP_LEVEL_KEYS`.
	 * @since 5.9.0 Renamed from `ALLOWED_TOP_LEVEL_KEYS` to `VALID_TOP_LEVEL_KEYS`,
	 *              added the `customTemplates` and `templateParts` values.
	 * @since 6.3.0 Added the `description` value.
	 * @var string[]
	 */
	const VALID_TOP_LEVEL_KEYS = array(
		'customTemplates',
		'description',
		'patterns',
		'settings',
		'styles',
		'templateParts',
		'title',
		'version',
	);

	/**
	 * The valid properties under the settings key.
	 *
	 * @since 5.8.0 As `ALLOWED_SETTINGS`.
	 * @since 5.9.0 Renamed from `ALLOWED_SETTINGS` to `VALID_SETTINGS`,
	 *              added new properties for `border`, `color`, `spacing`,
	 *              and `typography`, and renamed others according to the new schema.
	 * @since 6.0.0 Added `color.defaultDuotone`.
	 * @since 6.1.0 Added `layout.definitions` and `useRootPaddingAwareAlignments`.
	 * @since 6.2.0 Added `dimensions.minHeight`, 'shadow.presets', 'shadow.defaultPresets',
	 *              `position.fixed` and `position.sticky`.
	 * @since 6.3.0 Added support for `typography.textColumns`, removed `layout.definitions`.
	 * @since 6.4.0 Added support for `layout.allowEditing`, `background.backgroundImage`,
	 *              `typography.writingMode`, `lightbox.enabled` and `lightbox.allowEditing`.
	 * @var array
	 */
	const VALID_SETTINGS = array(
		'appearanceTools'               => null,
		'useRootPaddingAwareAlignments' => null,
		'background'                    => array(
			'backgroundImage' => null,
		),
		'border'                        => array(
			'color'  => null,
			'radius' => null,
			'style'  => null,
			'width'  => null,
		),
		'color'                         => array(
			'background'       => null,
			'custom'           => null,
			'customDuotone'    => null,
			'customGradient'   => null,
			'defaultDuotone'   => null,
			'defaultGradients' => null,
			'defaultPalette'   => null,
			'duotone'          => null,
			'gradients'        => null,
			'link'             => null,
			'heading'          => null,
			'button'           => null,
			'caption'          => null,
			'palette'          => null,
			'text'             => null,
		),
		'custom'                        => null,
		'dimensions'                    => array(
			'minHeight' => null,
		),
		'layout'                        => array(
			'contentSize'  => null,
			'wideSize'     => null,
			'allowEditing' => null,
		),
		'lightbox'                      => array(
			'enabled'      => null,
			'allowEditing' => null,
		),
		'position'                      => array(
			'fixed'  => null,
			'sticky' => null,
		),
		'spacing'                       => array(
			'customSpacingSize' => null,
			'spacingSizes'      => null,
			'spacingScale'      => null,
			'blockGap'          => null,
			'margin'            => null,
			'padding'           => null,
			'units'             => null,
		),
		'shadow'                        => array(
			'presets'        => null,
			'defaultPresets' => null,
		),
		'typography'                    => array(
			'fluid'          => null,
			'customFontSize' => null,
			'dropCap'        => null,
			'fontFamilies'   => null,
			'fontSizes'      => null,
			'fontStyle'      => null,
			'fontWeight'     => null,
			'letterSpacing'  => null,
			'lineHeight'     => null,
			'textColumns'    => null,
			'textDecoration' => null,
			'textTransform'  => null,
			'writingMode'    => null,
		),
	);

	/**
	 * The valid properties under the styles key.
	 *
	 * @since 5.8.0 As `ALLOWED_STYLES`.
	 * @since 5.9.0 Renamed from `ALLOWED_STYLES` to `VALID_STYLES`,
	 *              added new properties for `border`, `filter`, `spacing`,
	 *              and `typography`.
	 * @since 6.1.0 Added new side properties for `border`,
	 *              added new property `shadow`,
	 *              updated `blockGap` to be allowed at any level.
	 * @since 6.2.0 Added `outline`, and `minHeight` properties.
	 * @since 6.3.0 Added support for `typography.textColumns`.
	 *
	 * @var array
	 */
	const VALID_STYLES = array(
		'border'     => array(
			'color'  => null,
			'radius' => null,
			'style'  => null,
			'width'  => null,
			'top'    => null,
			'right'  => null,
			'bottom' => null,
			'left'   => null,
		),
		'color'      => array(
			'background' => null,
			'gradient'   => null,
			'text'       => null,
		),
		'dimensions' => array(
			'minHeight' => null,
		),
		'filter'     => array(
			'duotone' => null,
		),
		'outline'    => array(
			'color'  => null,
			'offset' => null,
			'style'  => null,
			'width'  => null,
		),
		'shadow'     => null,
		'spacing'    => array(
			'margin'   => null,
			'padding'  => null,
			'blockGap' => null,
		),
		'typography' => array(
			'fontFamily'     => null,
			'fontSize'       => null,
			'fontStyle'      => null,
			'fontWeight'     => null,
			'letterSpacing'  => null,
			'lineHeight'     => null,
			'textColumns'    => null,
			'textDecoration' => null,
			'textTransform'  => null,
			'writingMode'    => null,
		),
		'css'        => null,
	);

	/**
	 * Defines which pseudo selectors are enabled for which elements.
	 *
	 * The order of the selectors should be: link, any-link, visited, hover, focus, active.
	 * This is to ensure the user action (hover, focus and active) styles have a higher
	 * specificity than the visited styles, which in turn have a higher specificity than
	 * the unvisited styles.
	 *
	 * See https://core.trac.wordpress.org/ticket/56928.
	 * Note: this will affect both top-level and block-level elements.
	 *
	 * @since 6.1.0
	 * @since 6.2.0 Added support for ':link' and ':any-link'.
	 */
	const VALID_ELEMENT_PSEUDO_SELECTORS = array(
		'link'   => array( ':link', ':any-link', ':visited', ':hover', ':focus', ':active' ),
		'button' => array( ':link', ':any-link', ':visited', ':hover', ':focus', ':active' ),
	);

	/**
	 * The valid elements that can be found under styles.
	 *
	 * @since 5.8.0
	 * @since 6.1.0 Added `heading`, `button`, and `caption` elements.
	 * @var string[]
	 */
	const ELEMENTS = array(
		'link'    => 'a:where(:not(.wp-element-button))', // The `where` is needed to lower the specificity.
		'heading' => 'h1, h2, h3, h4, h5, h6',
		'h1'      => 'h1',
		'h2'      => 'h2',
		'h3'      => 'h3',
		'h4'      => 'h4',
		'h5'      => 'h5',
		'h6'      => 'h6',
		// We have the .wp-block-button__link class so that this will target older buttons that have been serialized.
		'button'  => '.wp-element-button, .wp-block-button__link',
		// The block classes are necessary to target older content that won't use the new class names.
		'caption' => '.wp-element-caption, .wp-block-audio figcaption, .wp-block-embed figcaption, .wp-block-gallery figcaption, .wp-block-image figcaption, .wp-block-table figcaption, .wp-block-video figcaption',
		'cite'    => 'cite',
	);

	const __EXPERIMENTAL_ELEMENT_CLASS_NAMES = array(
		'button'  => 'wp-element-button',
		'caption' => 'wp-element-caption',
	);

	/**
	 * List of block support features that can have their related styles
	 * generated under their own feature level selector rather than the block's.
	 *
	 * @since 6.1.0
	 * @var string[]
	 */
	const BLOCK_SUPPORT_FEATURE_LEVEL_SELECTORS = array(
		'__experimentalBorder' => 'border',
		'color'                => 'color',
		'spacing'              => 'spacing',
		'typography'           => 'typography',
	);

	/**
	 * Returns a class name by an element name.
	 *
	 * @since 6.1.0
	 *
	 * @param string $element The name of the element.
	 * @return string The name of the class.
	 */
	public static function get_element_class_name( $element ) {
		$class_name = '';

		if ( isset( static::__EXPERIMENTAL_ELEMENT_CLASS_NAMES[ $element ] ) ) {
			$class_name = static::__EXPERIMENTAL_ELEMENT_CLASS_NAMES[ $element ];
		}

		return $class_name;
	}

	/**
	 * Options that settings.appearanceTools enables.
	 *
	 * @since 6.0.0
	 * @since 6.2.0 Added `dimensions.minHeight` and `position.sticky`.
	 * @since 6.4.0 Added `background.backgroundImage`.
	 * @var array
	 */
	const APPEARANCE_TOOLS_OPT_INS = array(
		array( 'background', 'backgroundImage' ),
		array( 'border', 'color' ),
		array( 'border', 'radius' ),
		array( 'border', 'style' ),
		array( 'border', 'width' ),
		array( 'color', 'link' ),
		array( 'color', 'heading' ),
		array( 'color', 'button' ),
		array( 'color', 'caption' ),
		array( 'dimensions', 'minHeight' ),
		array( 'position', 'sticky' ),
		array( 'spacing', 'blockGap' ),
		array( 'spacing', 'margin' ),
		array( 'spacing', 'padding' ),
		array( 'typography', 'lineHeight' ),
	);

	/**
	 * The latest version of the schema in use.
	 *
	 * @since 5.8.0
	 * @since 5.9.0 Changed value from 1 to 2.
	 * @var int
	 */
	const LATEST_SCHEMA = 2;

	/**
	 * Constructor.
	 *
	 * @since 5.8.0
	 *
	 * @param array  $theme_json A structure that follows the theme.json schema.
	 * @param string $origin     Optional. What source of data this object represents.
	 *                           One of 'default', 'theme', or 'custom'. Default 'theme'.
	 */
	public function __construct( $theme_json = array(), $origin = 'theme' ) {
		if ( ! in_array( $origin, static::VALID_ORIGINS, true ) ) {
			$origin = 'theme';
		}

		$this->theme_json    = WP_Theme_JSON_Schema::migrate( $theme_json );
		$valid_block_names   = array_keys( static::get_blocks_metadata() );
		$valid_element_names = array_keys( static::ELEMENTS );
		$valid_variations    = array();
		foreach ( self::get_blocks_metadata() as $block_name => $block_meta ) {
			if ( ! isset( $block_meta['styleVariations'] ) ) {
				continue;
			}
			$valid_variations[ $block_name ] = array_keys( $block_meta['styleVariations'] );
		}
		$theme_json       = static::sanitize( $this->theme_json, $valid_block_names, $valid_element_names, $valid_variations );
		$this->theme_json = static::maybe_opt_in_into_settings( $theme_json );

		// Internally, presets are keyed by origin.
		$nodes = static::get_setting_nodes( $this->theme_json );
		foreach ( $nodes as $node ) {
			foreach ( static::PRESETS_METADATA as $preset_metadata ) {
				$path = $node['path'];
				foreach ( $preset_metadata['path'] as $subpath ) {
					$path[] = $subpath;
				}
				$preset = _wp_array_get( $this->theme_json, $path, null );
				if ( null !== $preset ) {
					// If the preset is not already keyed by origin.
					if ( isset( $preset[0] ) || empty( $preset ) ) {
						_wp_array_set( $this->theme_json, $path, array( $origin => $preset ) );
					}
				}
			}
		}
	}

	/**
	 * Enables some opt-in settings if theme declared support.
	 *
	 * @since 5.9.0
	 *
	 * @param array $theme_json A theme.json structure to modify.
	 * @return array The modified theme.json structure.
	 */
	protected static function maybe_opt_in_into_settings( $theme_json ) {
		$new_theme_json = $theme_json;

		if (
			isset( $new_theme_json['settings']['appearanceTools'] ) &&
			true === $new_theme_json['settings']['appearanceTools']
		) {
			static::do_opt_in_into_settings( $new_theme_json['settings'] );
		}

		if ( isset( $new_theme_json['settings']['blocks'] ) && is_array( $new_theme_json['settings']['blocks'] ) ) {
			foreach ( $new_theme_json['settings']['blocks'] as &$block ) {
				if ( isset( $block['appearanceTools'] ) && ( true === $block['appearanceTools'] ) ) {
					static::do_opt_in_into_settings( $block );
				}
			}
		}

		return $new_theme_json;
	}

	/**
	 * Enables some settings.
	 *
	 * @since 5.9.0
	 *
	 * @param array $context The context to which the settings belong.
	 */
	protected static function do_opt_in_into_settings( &$context ) {
		foreach ( static::APPEARANCE_TOOLS_OPT_INS as $path ) {
			/*
			 * Use "unset prop" as a marker instead of "null" because
			 * "null" can be a valid value for some props (e.g. blockGap).
			 */
			if ( 'unset prop' === _wp_array_get( $context, $path, 'unset prop' ) ) {
				_wp_array_set( $context, $path, true );
			}
		}

		unset( $context['appearanceTools'] );
	}

	/**
	 * Sanitizes the input according to the schemas.
	 *
	 * @since 5.8.0
	 * @since 5.9.0 Added the `$valid_block_names` and `$valid_element_name` parameters.
	 * @since 6.3.0 Added the `$valid_variations` parameter.
	 *
	 * @param array $input               Structure to sanitize.
	 * @param array $valid_block_names   List of valid block names.
	 * @param array $valid_element_names List of valid element names.
	 * @param array $valid_variations    List of valid variations per block.
	 * @return array The sanitized output.
	 */
	protected static function sanitize( $input, $valid_block_names, $valid_element_names, $valid_variations ) {

		$output = array();

		if ( ! is_array( $input ) ) {
			return $output;
		}

		// Preserve only the top most level keys.
		$output = array_intersect_key( $input, array_flip( static::VALID_TOP_LEVEL_KEYS ) );

		/*
		 * Remove any rules that are annotated as "top" in VALID_STYLES constant.
		 * Some styles are only meant to be available at the top-level (e.g.: blockGap),
		 * hence, the schema for blocks & elements should not have them.
		 */
		$styles_non_top_level = static::VALID_STYLES;
		foreach ( array_keys( $styles_non_top_level ) as $section ) {
			// array_key_exists() needs to be used instead of isset() because the value can be null.
			if ( array_key_exists( $section, $styles_non_top_level ) && is_array( $styles_non_top_level[ $section ] ) ) {
				foreach ( array_keys( $styles_non_top_level[ $section ] ) as $prop ) {
					if ( 'top' === $styles_non_top_level[ $section ][ $prop ] ) {
						unset( $styles_non_top_level[ $section ][ $prop ] );
					}
				}
			}
		}

		// Build the schema based on valid block & element names.
		$schema                 = array();
		$schema_styles_elements = array();

		/*
		 * Set allowed element pseudo selectors based on per element allow list.
		 * Target data structure in schema:
		 * e.g.
		 * - top level elements: `$schema['styles']['elements']['link'][':hover']`.
		 * - block level elements: `$schema['styles']['blocks']['core/button']['elements']['link'][':hover']`.
		 */
		foreach ( $valid_element_names as $element ) {
			$schema_styles_elements[ $element ] = $styles_non_top_level;

			if ( isset( static::VALID_ELEMENT_PSEUDO_SELECTORS[ $element ] ) ) {
				foreach ( static::VALID_ELEMENT_PSEUDO_SELECTORS[ $element ] as $pseudo_selector ) {
					$schema_styles_elements[ $element ][ $pseudo_selector ] = $styles_non_top_level;
				}
			}
		}

		$schema_styles_blocks   = array();
		$schema_settings_blocks = array();
		foreach ( $valid_block_names as $block ) {
			// Build the schema for each block style variation.
			$style_variation_names = array();
			if (
				! empty( $input['styles']['blocks'][ $block ]['variations'] ) &&
				is_array( $input['styles']['blocks'][ $block ]['variations'] ) &&
				isset( $valid_variations[ $block ] )
			) {
				$style_variation_names = array_intersect(
					array_keys( $input['styles']['blocks'][ $block ]['variations'] ),
					$valid_variations[ $block ]
				);
			}

			$schema_styles_variations = array();
			if ( ! empty( $style_variation_names ) ) {
				$schema_styles_variations = array_fill_keys( $style_variation_names, $styles_non_top_level );
			}

			$schema_settings_blocks[ $block ]             = static::VALID_SETTINGS;
			$schema_styles_blocks[ $block ]               = $styles_non_top_level;
			$schema_styles_blocks[ $block ]['elements']   = $schema_styles_elements;
			$schema_styles_blocks[ $block ]['variations'] = $schema_styles_variations;
		}

		$schema['styles']             = static::VALID_STYLES;
		$schema['styles']['blocks']   = $schema_styles_blocks;
		$schema['styles']['elements'] = $schema_styles_elements;
		$schema['settings']           = static::VALID_SETTINGS;
		$schema['settings']['blocks'] = $schema_settings_blocks;

		// Remove anything that's not present in the schema.
		foreach ( array( 'styles', 'settings' ) as $subtree ) {
			if ( ! isset( $input[ $subtree ] ) ) {
				continue;
			}

			if ( ! is_array( $input[ $subtree ] ) ) {
				unset( $output[ $subtree ] );
				continue;
			}

			$result = static::remove_keys_not_in_schema( $input[ $subtree ], $schema[ $subtree ] );

			if ( empty( $result ) ) {
				unset( $output[ $subtree ] );
			} else {
				$output[ $subtree ] = static::resolve_custom_css_format( $result );
			}
		}

		return $output;
	}

	/**
	 * Appends a sub-selector to an existing one.
	 *
	 * Given the compounded $selector "h1, h2, h3"
	 * and the $to_append selector ".some-class" the result will be
	 * "h1.some-class, h2.some-class, h3.some-class".
	 *
	 * @since 5.8.0
	 * @since 6.1.0 Added append position.
	 * @since 6.3.0 Removed append position parameter.
	 *
	 * @param string $selector  Original selector.
	 * @param string $to_append Selector to append.
	 * @return string The new selector.
	 */
	protected static function append_to_selector( $selector, $to_append ) {
		if ( ! str_contains( $selector, ',' ) ) {
			return $selector . $to_append;
		}
		$new_selectors = array();
		$selectors     = explode( ',', $selector );
		foreach ( $selectors as $sel ) {
			$new_selectors[] = $sel . $to_append;
		}
		return implode( ',', $new_selectors );
	}

	/**
	 * Prepends a sub-selector to an existing one.
	 *
	 * Given the compounded $selector "h1, h2, h3"
	 * and the $to_prepend selector ".some-class " the result will be
	 * ".some-class h1, .some-class  h2, .some-class  h3".
	 *
	 * @since 6.3.0
	 *
	 * @param string $selector   Original selector.
	 * @param string $to_prepend Selector to prepend.
	 * @return string The new selector.
	 */
	protected static function prepend_to_selector( $selector, $to_prepend ) {
		if ( ! str_contains( $selector, ',' ) ) {
			return $to_prepend . $selector;
		}
		$new_selectors = array();
		$selectors     = explode( ',', $selector );
		foreach ( $selectors as $sel ) {
			$new_selectors[] = $to_prepend . $sel;
		}
		return implode( ',', $new_selectors );
	}

	/**
	 * Returns the metadata for each block.
	 *
	 * Example:
	 *
	 *     {
	 *       'core/paragraph': {
	 *         'selector': 'p',
	 *         'elements': {
	 *           'link' => 'link selector',
	 *           'etc'  => 'element selector'
	 *         }
	 *       },
	 *       'core/heading': {
	 *         'selector': 'h1',
	 *         'elements': {}
	 *       },
	 *       'core/image': {
	 *         'selector': '.wp-block-image',
	 *         'duotone': 'img',
	 *         'elements': {}
	 *       }
	 *     }
	 *
	 * @since 5.8.0
	 * @since 5.9.0 Added `duotone` key with CSS selector.
	 * @since 6.1.0 Added `features` key with block support feature level selectors.
	 * @since 6.3.0 Refactored and stabilized selectors API.
	 *
	 * @return array Block metadata.
	 */
	protected static function get_blocks_metadata() {
		$registry = WP_Block_Type_Registry::get_instance();
		$blocks   = $registry->get_all_registered();

		// Is there metadata for all currently registered blocks?
		$blocks = array_diff_key( $blocks, static::$blocks_metadata );
		if ( empty( $blocks ) ) {
			return static::$blocks_metadata;
		}

		foreach ( $blocks as $block_name => $block_type ) {
			$root_selector = wp_get_block_css_selector( $block_type );

			static::$blocks_metadata[ $block_name ]['selector']  = $root_selector;
			static::$blocks_metadata[ $block_name ]['selectors'] = static::get_block_selectors( $block_type, $root_selector );

			$elements = static::get_block_element_selectors( $root_selector );
			if ( ! empty( $elements ) ) {
				static::$blocks_metadata[ $block_name ]['elements'] = $elements;
			}

			// The block may or may not have a duotone selector.
			$duotone_selector = wp_get_block_css_selector( $block_type, 'filter.duotone' );

			// Keep backwards compatibility for support.color.__experimentalDuotone.
			if ( null === $duotone_selector ) {
				$duotone_support = isset( $block_type->supports['color']['__experimentalDuotone'] )
					? $block_type->supports['color']['__experimentalDuotone']
					: null;

				if ( $duotone_support ) {
					$root_selector    = wp_get_block_css_selector( $block_type );
					$duotone_selector = WP_Theme_JSON::scope_selector( $root_selector, $duotone_support );
				}
			}

			if ( null !== $duotone_selector ) {
				static::$blocks_metadata[ $block_name ]['duotone'] = $duotone_selector;
			}

			// If the block has style variations, append their selectors to the block metadata.
			if ( ! empty( $block_type->styles ) ) {
				$style_selectors = array();
				foreach ( $block_type->styles as $style ) {
					// The style variation classname is duplicated in the selector to ensure that it overrides core block styles.
					$style_selectors[ $style['name'] ] = static::append_to_selector( '.is-style-' . $style['name'] . '.is-style-' . $style['name'], static::$blocks_metadata[ $block_name ]['selector'] );
				}
				static::$blocks_metadata[ $block_name ]['styleVariations'] = $style_selectors;
			}
		}

		return static::$blocks_metadata;
	}

	/**
	 * Given a tree, removes the keys that are not present in the schema.
	 *
	 * It is recursive and modifies the input in-place.
	 *
	 * @since 5.8.0
	 *
	 * @param array $tree   Input to process.
	 * @param array $schema Schema to adhere to.
	 * @return array The modified $tree.
	 */
	protected static function remove_keys_not_in_schema( $tree, $schema ) {
		$tree = array_intersect_key( $tree, $schema );

		foreach ( $schema as $key => $data ) {
			if ( ! isset( $tree[ $key ] ) ) {
				continue;
			}

			if ( is_array( $schema[ $key ] ) && is_array( $tree[ $key ] ) ) {
				$tree[ $key ] = static::remove_keys_not_in_schema( $tree[ $key ], $schema[ $key ] );

				if ( empty( $tree[ $key ] ) ) {
					unset( $tree[ $key ] );
				}
			} elseif ( is_array( $schema[ $key ] ) && ! is_array( $tree[ $key ] ) ) {
				unset( $tree[ $key ] );
			}
		}

		return $tree;
	}

	/**
	 * Returns the existing settings for each block.
	 *
	 * Example:
	 *
	 *     {
	 *       'root': {
	 *         'color': {
	 *           'custom': true
	 *         }
	 *       },
	 *       'core/paragraph': {
	 *         'spacing': {
	 *           'customPadding': true
	 *         }
	 *       }
	 *     }
	 *
	 * @since 5.8.0
	 *
	 * @return array Settings per block.
	 */
	public function get_settings() {
		if ( ! isset( $this->theme_json['settings'] ) ) {
			return array();
		} else {
			return $this->theme_json['settings'];
		}
	}

	/**
	 * Returns the stylesheet that results of processing
	 * the theme.json structure this object represents.
	 *
	 * @since 5.8.0
	 * @since 5.9.0 Removed the `$type` parameter, added the `$types` and `$origins` parameters.
	 * @since 6.3.0 Add fallback layout styles for Post Template when block gap support isn't available.
	 *
	 * @param string[] $types   Types of styles to load. Will load all by default. It accepts:
	 *                          - `variables`: only the CSS Custom Properties for presets & custom ones.
	 *                          - `styles`: only the styles section in theme.json.
	 *                          - `presets`: only the classes for the presets.
	 * @param string[] $origins A list of origins to include. By default it includes VALID_ORIGINS.
	 * @param array    $options An array of options for now used for internal purposes only (may change without notice).
	 *                          The options currently supported are 'scope' that makes sure all style are scoped to a
	 *                          given selector, and root_selector which overwrites and forces a given selector to be
	 *                          used on the root node.
	 * @return string The resulting stylesheet.
	 */
	public function get_stylesheet( $types = array( 'variables', 'styles', 'presets' ), $origins = null, $options = array() ) {
		if ( null === $origins ) {
			$origins = static::VALID_ORIGINS;
		}

		if ( is_string( $types ) ) {
			// Dispatch error and map old arguments to new ones.
			_deprecated_argument( __FUNCTION__, '5.9.0' );
			if ( 'block_styles' === $types ) {
				$types = array( 'styles', 'presets' );
			} elseif ( 'css_variables' === $types ) {
				$types = array( 'variables' );
			} else {
				$types = array( 'variables', 'styles', 'presets' );
			}
		}

		$blocks_metadata = static::get_blocks_metadata();
		$style_nodes     = static::get_style_nodes( $this->theme_json, $blocks_metadata );
		$setting_nodes   = static::get_setting_nodes( $this->theme_json, $blocks_metadata );

		$root_style_key    = array_search( static::ROOT_BLOCK_SELECTOR, array_column( $style_nodes, 'selector' ), true );
		$root_settings_key = array_search( static::ROOT_BLOCK_SELECTOR, array_column( $setting_nodes, 'selector' ), true );

		if ( ! empty( $options['scope'] ) ) {
			foreach ( $setting_nodes as &$node ) {
				$node['selector'] = static::scope_selector( $options['scope'], $node['selector'] );
			}
			foreach ( $style_nodes as &$node ) {
				$node['selector'] = static::scope_selector( $options['scope'], $node['selector'] );
			}
		}

		if ( ! empty( $options['root_selector'] ) ) {
			if ( false !== $root_settings_key ) {
				$setting_nodes[ $root_settings_key ]['selector'] = $options['root_selector'];
			}
			if ( false !== $root_style_key ) {
				$setting_nodes[ $root_style_key ]['selector'] = $options['root_selector'];
			}
		}

		$stylesheet = '';

		if ( in_array( 'variables', $types, true ) ) {
			$stylesheet .= $this->get_css_variables( $setting_nodes, $origins );
		}

		if ( in_array( 'styles', $types, true ) ) {
			if ( false !== $root_style_key ) {
				$stylesheet .= $this->get_root_layout_rules( $style_nodes[ $root_style_key ]['selector'], $style_nodes[ $root_style_key ] );
			}
			$stylesheet .= $this->get_block_classes( $style_nodes );
		} elseif ( in_array( 'base-layout-styles', $types, true ) ) {
			$root_selector          = static::ROOT_BLOCK_SELECTOR;
			$columns_selector       = '.wp-block-columns';
			$post_template_selector = '.wp-block-post-template';
			if ( ! empty( $options['scope'] ) ) {
				$root_selector          = static::scope_selector( $options['scope'], $root_selector );
				$columns_selector       = static::scope_selector( $options['scope'], $columns_selector );
				$post_template_selector = static::scope_selector( $options['scope'], $post_template_selector );
			}
			if ( ! empty( $options['root_selector'] ) ) {
				$root_selector = $options['root_selector'];
			}
			/*
			 * Base layout styles are provided as part of `styles`, so only output separately if explicitly requested.
			 * For backwards compatibility, the Columns block is explicitly included, to support a different default gap value.
			 */
			$base_styles_nodes = array(
				array(
					'path'     => array( 'styles' ),
					'selector' => $root_selector,
				),
				array(
					'path'     => array( 'styles', 'blocks', 'core/columns' ),
					'selector' => $columns_selector,
					'name'     => 'core/columns',
				),
				array(
					'path'     => array( 'styles', 'blocks', 'core/post-template' ),
					'selector' => $post_template_selector,
					'name'     => 'core/post-template',
				),
			);

			foreach ( $base_styles_nodes as $base_style_node ) {
				$stylesheet .= $this->get_layout_styles( $base_style_node );
			}
		}

		if ( in_array( 'presets', $types, true ) ) {
			$stylesheet .= $this->get_preset_classes( $setting_nodes, $origins );
		}

		return $stylesheet;
	}

	/**
	 * Processes the CSS, to apply nesting.
	 *
	 * @since 6.2.0
	 *
	 * @param string $css      The CSS to process.
	 * @param string $selector The selector to nest.
	 * @return string The processed CSS.
	 */
	protected function process_blocks_custom_css( $css, $selector ) {
		$processed_css = '';

		// Split CSS nested rules.
		$parts = explode( '&', $css );
		foreach ( $parts as $part ) {
			$is_root_css = ( ! str_contains( $part, '{' ) );
			if ( $is_root_css ) {
				// If the part doesn't contain braces, it applies to the root level.
				$processed_css .= trim( $selector ) . '{' . trim( $part ) . '}';
			} else {
				// If the part contains braces, it's a nested CSS rule.
				$part = explode( '{', str_replace( '}', '', $part ) );
				if ( count( $part ) !== 2 ) {
					continue;
				}
				$nested_selector = $part[0];
				$css_value       = $part[1];
				$part_selector   = str_starts_with( $nested_selector, ' ' )
					? static::scope_selector( $selector, $nested_selector )
					: static::append_to_selector( $selector, $nested_selector );
				$processed_css  .= $part_selector . '{' . trim( $css_value ) . '}';
			}
		}
		return $processed_css;
	}

	/**
	 * Returns the global styles custom CSS.
	 *
	 * @since 6.2.0
	 *
	 * @return string The global styles custom CSS.
	 */
	public function get_custom_css() {
		// Add the global styles root CSS.
		$stylesheet = isset( $this->theme_json['styles']['css'] ) ? $this->theme_json['styles']['css'] : '';

		// Add the global styles block CSS.
		if ( isset( $this->theme_json['styles']['blocks'] ) ) {
			foreach ( $this->theme_json['styles']['blocks'] as $name => $node ) {
				$custom_block_css = isset( $this->theme_json['styles']['blocks'][ $name ]['css'] )
					? $this->theme_json['styles']['blocks'][ $name ]['css']
					: null;
				if ( $custom_block_css ) {
					$selector    = static::$blocks_metadata[ $name ]['selector'];
					$stylesheet .= $this->process_blocks_custom_css( $custom_block_css, $selector );
				}
			}
		}

		return $stylesheet;
	}

	/**
	 * Returns the page templates of the active theme.
	 *
	 * @since 5.9.0
	 *
	 * @return array
	 */
	public function get_custom_templates() {
		$custom_templates = array();
		if ( ! isset( $this->theme_json['customTemplates'] ) || ! is_array( $this->theme_json['customTemplates'] ) ) {
			return $custom_templates;
		}

		foreach ( $this->theme_json['customTemplates'] as $item ) {
			if ( isset( $item['name'] ) ) {
				$custom_templates[ $item['name'] ] = array(
					'title'     => isset( $item['title'] ) ? $item['title'] : '',
					'postTypes' => isset( $item['postTypes'] ) ? $item['postTypes'] : array( 'page' ),
				);
			}
		}
		return $custom_templates;
	}

	/**
	 * Returns the template part data of active theme.
	 *
	 * @since 5.9.0
	 *
	 * @return array
	 */
	public function get_template_parts() {
		$template_parts = array();
		if ( ! isset( $this->theme_json['templateParts'] ) || ! is_array( $this->theme_json['templateParts'] ) ) {
			return $template_parts;
		}

		foreach ( $this->theme_json['templateParts'] as $item ) {
			if ( isset( $item['name'] ) ) {
				$template_parts[ $item['name'] ] = array(
					'title' => isset( $item['title'] ) ? $item['title'] : '',
					'area'  => isset( $item['area'] ) ? $item['area'] : '',
				);
			}
		}
		return $template_parts;
	}

	/**
	 * Converts each style section into a list of rulesets
	 * containing the block styles to be appended to the stylesheet.
	 *
	 * See glossary at https://developer.mozilla.org/en-US/docs/Web/CSS/Syntax
	 *
	 * For each section this creates a new ruleset such as:
	 *
	 *   block-selector {
	 *     style-property-one: value;
	 *   }
	 *
	 * @since 5.8.0 As `get_block_styles()`.
	 * @since 5.9.0 Renamed from `get_block_styles()` to `get_block_classes()`
	 *              and no longer returns preset classes.
	 *              Removed the `$setting_nodes` parameter.
	 * @since 6.1.0 Moved most internal logic to `get_styles_for_block()`.
	 *
	 * @param array $style_nodes Nodes with styles.
	 * @return string The new stylesheet.
	 */
	protected function get_block_classes( $style_nodes ) {
		$block_rules = '';

		foreach ( $style_nodes as $metadata ) {
			if ( null === $metadata['selector'] ) {
				continue;
			}
			$block_rules .= static::get_styles_for_block( $metadata );
		}

		return $block_rules;
	}

	/**
	 * Gets the CSS layout rules for a particular block from theme.json layout definitions.
	 *
	 * @since 6.1.0
	 * @since 6.3.0 Reduced specificity for layout margin rules.
	 *
	 * @param array $block_metadata Metadata about the block to get styles for.
	 * @return string Layout styles for the block.
	 */
	protected function get_layout_styles( $block_metadata ) {
		$block_rules = '';
		$block_type  = null;

		// Skip outputting layout styles if explicitly disabled.
		if ( current_theme_supports( 'disable-layout-styles' ) ) {
			return $block_rules;
		}

		if ( isset( $block_metadata['name'] ) ) {
			$block_type = WP_Block_Type_Registry::get_instance()->get_registered( $block_metadata['name'] );
			if ( ! block_has_support( $block_type, 'layout', false ) && ! block_has_support( $block_type, '__experimentalLayout', false ) ) {
				return $block_rules;
			}
		}

		$selector                 = isset( $block_metadata['selector'] ) ? $block_metadata['selector'] : '';
		$has_block_gap_support    = isset( $this->theme_json['settings']['spacing']['blockGap'] );
		$has_fallback_gap_support = ! $has_block_gap_support; // This setting isn't useful yet: it exists as a placeholder for a future explicit fallback gap styles support.
		$node                     = _wp_array_get( $this->theme_json, $block_metadata['path'], array() );
		$layout_definitions       = wp_get_layout_definitions();
		$layout_selector_pattern  = '/^[a-zA-Z0-9\-\.\ *+>:\(\)]*$/'; // Allow alphanumeric classnames, spaces, wildcard, sibling, child combinator and pseudo class selectors.

		/*
		 * Gap styles will only be output if the theme has block gap support, or supports a fallback gap.
		 * Default layout gap styles will be skipped for themes that do not explicitly opt-in to blockGap with a `true` or `false` value.
		 */
		if ( $has_block_gap_support || $has_fallback_gap_support ) {
			$block_gap_value = null;
			// Use a fallback gap value if block gap support is not available.
			if ( ! $has_block_gap_support ) {
				$block_gap_value = static::ROOT_BLOCK_SELECTOR === $selector ? '0.5em' : null;
				if ( ! empty( $block_type ) ) {
					$block_gap_value = isset( $block_type->supports['spacing']['blockGap']['__experimentalDefault'] )
						? $block_type->supports['spacing']['blockGap']['__experimentalDefault']
						: null;
				}
			} else {
				$block_gap_value = static::get_property_value( $node, array( 'spacing', 'blockGap' ) );
			}

			// Support split row / column values and concatenate to a shorthand value.
			if ( is_array( $block_gap_value ) ) {
				if ( isset( $block_gap_value['top'] ) && isset( $block_gap_value['left'] ) ) {
					$gap_row         = static::get_property_value( $node, array( 'spacing', 'blockGap', 'top' ) );
					$gap_column      = static::get_property_value( $node, array( 'spacing', 'blockGap', 'left' ) );
					$block_gap_value = $gap_row === $gap_column ? $gap_row : $gap_row . ' ' . $gap_column;
				} else {
					// Skip outputting gap value if not all sides are provided.
					$block_gap_value = null;
				}
			}

			// If the block should have custom gap, add the gap styles.
			if ( null !== $block_gap_value && false !== $block_gap_value && '' !== $block_gap_value ) {
				foreach ( $layout_definitions as $layout_definition_key => $layout_definition ) {
					// Allow outputting fallback gap styles for flex and grid layout types when block gap support isn't available.
					if ( ! $has_block_gap_support && 'flex' !== $layout_definition_key && 'grid' !== $layout_definition_key ) {
						continue;
					}

					$class_name    = isset( $layout_definition['className'] ) ? $layout_definition['className'] : false;
					$spacing_rules = isset( $layout_definition['spacingStyles'] ) ? $layout_definition['spacingStyles'] : array();

					if (
						! empty( $class_name ) &&
						! empty( $spacing_rules )
					) {
						foreach ( $spacing_rules as $spacing_rule ) {
							$declarations = array();
							if (
								isset( $spacing_rule['selector'] ) &&
								preg_match( $layout_selector_pattern, $spacing_rule['selector'] ) &&
								! empty( $spacing_rule['rules'] )
							) {
								// Iterate over each of the styling rules and substitute non-string values such as `null` with the real `blockGap` value.
								foreach ( $spacing_rule['rules'] as $css_property => $css_value ) {
									$current_css_value = is_string( $css_value ) ? $css_value : $block_gap_value;
									if ( static::is_safe_css_declaration( $css_property, $current_css_value ) ) {
										$declarations[] = array(
											'name'  => $css_property,
											'value' => $current_css_value,
										);
									}
								}

								if ( ! $has_block_gap_support ) {
									// For fallback gap styles, use lower specificity, to ensure styles do not unintentionally override theme styles.
									$format          = static::ROOT_BLOCK_SELECTOR === $selector ? ':where(.%2$s%3$s)' : ':where(%1$s.%2$s%3$s)';
									$layout_selector = sprintf(
										$format,
										$selector,
										$class_name,
										$spacing_rule['selector']
									);
								} else {
									$format          = static::ROOT_BLOCK_SELECTOR === $selector ? ':where(%s .%s) %s' : '%s-%s%s';
									$layout_selector = sprintf(
										$format,
										$selector,
										$class_name,
										$spacing_rule['selector']
									);
								}
								$block_rules .= static::to_ruleset( $layout_selector, $declarations );
							}
						}
					}
				}
			}
		}

		// Output base styles.
		if (
			static::ROOT_BLOCK_SELECTOR === $selector
		) {
			$valid_display_modes = array( 'block', 'flex', 'grid' );
			foreach ( $layout_definitions as $layout_definition ) {
				$class_name       = isset( $layout_definition['className'] ) ? $layout_definition['className'] : false;
				$base_style_rules = isset( $layout_definition['baseStyles'] ) ? $layout_definition['baseStyles'] : array();

				if (
					! empty( $class_name ) &&
					is_array( $base_style_rules )
				) {
					// Output display mode. This requires special handling as `display` is not exposed in `safe_style_css_filter`.
					if (
						! empty( $layout_definition['displayMode'] ) &&
						is_string( $layout_definition['displayMode'] ) &&
						in_array( $layout_definition['displayMode'], $valid_display_modes, true )
					) {
						$layout_selector = sprintf(
							'%s .%s',
							$selector,
							$class_name
						);
						$block_rules    .= static::to_ruleset(
							$layout_selector,
							array(
								array(
									'name'  => 'display',
									'value' => $layout_definition['displayMode'],
								),
							)
						);
					}

					foreach ( $base_style_rules as $base_style_rule ) {
						$declarations = array();

						if (
							isset( $base_style_rule['selector'] ) &&
							preg_match( $layout_selector_pattern, $base_style_rule['selector'] ) &&
							! empty( $base_style_rule['rules'] )
						) {
							foreach ( $base_style_rule['rules'] as $css_property => $css_value ) {
								if ( static::is_safe_css_declaration( $css_property, $css_value ) ) {
									$declarations[] = array(
										'name'  => $css_property,
										'value' => $css_value,
									);
								}
							}

							$layout_selector = sprintf(
								'%s .%s%s',
								$selector,
								$class_name,
								$base_style_rule['selector']
							);
							$block_rules    .= static::to_ruleset( $layout_selector, $declarations );
						}
					}
				}
			}
		}
		return $block_rules;
	}

	/**
	 * Creates new rulesets as classes for each preset value such as:
	 *
	 *   .has-value-color {
	 *     color: value;
	 *   }
	 *
	 *   .has-value-background-color {
	 *     background-color: value;
	 *   }
	 *
	 *   .has-value-font-size {
	 *     font-size: value;
	 *   }
	 *
	 *   .has-value-gradient-background {
	 *     background: value;
	 *   }
	 *
	 *   p.has-value-gradient-background {
	 *     background: value;
	 *   }
	 *
	 * @since 5.9.0
	 *
	 * @param array    $setting_nodes Nodes with settings.
	 * @param string[] $origins       List of origins to process presets from.
	 * @return string The new stylesheet.
	 */
	protected function get_preset_classes( $setting_nodes, $origins ) {
		$preset_rules = '';

		foreach ( $setting_nodes as $metadata ) {
			if ( null === $metadata['selector'] ) {
				continue;
			}

			$selector      = $metadata['selector'];
			$node          = _wp_array_get( $this->theme_json, $metadata['path'], array() );
			$preset_rules .= static::compute_preset_classes( $node, $selector, $origins );
		}

		return $preset_rules;
	}

	/**
	 * Converts each styles section into a list of rulesets
	 * to be appended to the stylesheet.
	 * These rulesets contain all the css variables (custom variables and preset variables).
	 *
	 * See glossary at https://developer.mozilla.org/en-US/docs/Web/CSS/Syntax
	 *
	 * For each section this creates a new ruleset such as:
	 *
	 *     block-selector {
	 *       --wp--preset--category--slug: value;
	 *       --wp--custom--variable: value;
	 *     }
	 *
	 * @since 5.8.0
	 * @since 5.9.0 Added the `$origins` parameter.
	 *
	 * @param array    $nodes   Nodes with settings.
	 * @param string[] $origins List of origins to process.
	 * @return string The new stylesheet.
	 */
	protected function get_css_variables( $nodes, $origins ) {
		$stylesheet = '';
		foreach ( $nodes as $metadata ) {
			if ( null === $metadata['selector'] ) {
				continue;
			}

			$selector = $metadata['selector'];

			$node                    = _wp_array_get( $this->theme_json, $metadata['path'], array() );
			$declarations            = static::compute_preset_vars( $node, $origins );
			$theme_vars_declarations = static::compute_theme_vars( $node );
			foreach ( $theme_vars_declarations as $theme_vars_declaration ) {
				$declarations[] = $theme_vars_declaration;
			}

			$stylesheet .= static::to_ruleset( $selector, $declarations );
		}

		return $stylesheet;
	}

	/**
	 * Given a selector and a declaration list,
	 * creates the corresponding ruleset.
	 *
	 * @since 5.8.0
	 *
	 * @param string $selector     CSS selector.
	 * @param array  $declarations List of declarations.
	 * @return string The resulting CSS ruleset.
	 */
	protected static function to_ruleset( $selector, $declarations ) {
		if ( empty( $declarations ) ) {
			return '';
		}

		$declaration_block = array_reduce(
			$declarations,
			static function ( $carry, $element ) {
				return $carry .= $element['name'] . ': ' . $element['value'] . ';'; },
			''
		);

		return $selector . '{' . $declaration_block . '}';
	}

	/**
	 * Given a settings array, returns the generated rulesets
	 * for the preset classes.
	 *
	 * @since 5.8.0
	 * @since 5.9.0 Added the `$origins` parameter.
	 *
	 * @param array    $settings Settings to process.
	 * @param string   $selector Selector wrapping the classes.
	 * @param string[] $origins  List of origins to process.
	 * @return string The result of processing the presets.
	 */
	protected static function compute_preset_classes( $settings, $selector, $origins ) {
		if ( static::ROOT_BLOCK_SELECTOR === $selector ) {
			/*
			 * Classes at the global level do not need any CSS prefixed,
			 * and we don't want to increase its specificity.
			 */
			$selector = '';
		}

		$stylesheet = '';
		foreach ( static::PRESETS_METADATA as $preset_metadata ) {
			if ( empty( $preset_metadata['classes'] ) ) {
				continue;
			}
			$slugs = static::get_settings_slugs( $settings, $preset_metadata, $origins );
			foreach ( $preset_metadata['classes'] as $class => $property ) {
				foreach ( $slugs as $slug ) {
					$css_var    = static::replace_slug_in_string( $preset_metadata['css_vars'], $slug );
					$class_name = static::replace_slug_in_string( $class, $slug );

					// $selector is often empty, so we can save ourselves the `append_to_selector()` call then.
					$new_selector = '' === $selector ? $class_name : static::append_to_selector( $selector, $class_name );
					$stylesheet  .= static::to_ruleset(
						$new_selector,
						array(
							array(
								'name'  => $property,
								'value' => 'var(' . $css_var . ') !important',
							),
						)
					);
				}
			}
		}

		return $stylesheet;
	}

	/**
	 * Function that scopes a selector with another one. This works a bit like
	 * SCSS nesting except the `&` operator isn't supported.
	 *
	 * <code>
	 * $scope = '.a, .b .c';
	 * $selector = '> .x, .y';
	 * $merged = scope_selector( $scope, $selector );
	 * // $merged is '.a > .x, .a .y, .b .c > .x, .b .c .y'
	 * </code>
	 *
	 * @since 5.9.0
	 *
	 * @param string $scope    Selector to scope to.
	 * @param string $selector Original selector.
	 * @return string Scoped selector.
	 */
	public static function scope_selector( $scope, $selector ) {
		$scopes    = explode( ',', $scope );
		$selectors = explode( ',', $selector );

		$selectors_scoped = array();
		foreach ( $scopes as $outer ) {
			foreach ( $selectors as $inner ) {
				$outer = trim( $outer );
				$inner = trim( $inner );
				if ( ! empty( $outer ) && ! empty( $inner ) ) {
					$selectors_scoped[] = $outer . ' ' . $inner;
				} elseif ( empty( $outer ) ) {
					$selectors_scoped[] = $inner;
				} elseif ( empty( $inner ) ) {
					$selectors_scoped[] = $outer;
				}
			}
		}

		$result = implode( ', ', $selectors_scoped );
		return $result;
	}

	/**
	 * Gets preset values keyed by slugs based on settings and metadata.
	 *
	 * <code>
	 * $settings = array(
	 *     'typography' => array(
	 *         'fontFamilies' => array(
	 *             array(
	 *                 'slug'       => 'sansSerif',
	 *                 'fontFamily' => '"Helvetica Neue", sans-serif',
	 *             ),
	 *             array(
	 *                 'slug'   => 'serif',
	 *                 'colors' => 'Georgia, serif',
	 *             )
	 *         ),
	 *     ),
	 * );
	 * $meta = array(
	 *    'path'      => array( 'typography', 'fontFamilies' ),
	 *    'value_key' => 'fontFamily',
	 * );
	 * $values_by_slug = get_settings_values_by_slug();
	 * // $values_by_slug === array(
	 * //   'sans-serif' => '"Helvetica Neue", sans-serif',
	 * //   'serif'      => 'Georgia, serif',
	 * // );
	 * </code>
	 *
	 * @since 5.9.0
	 *
	 * @param array    $settings        Settings to process.
	 * @param array    $preset_metadata One of the PRESETS_METADATA values.
	 * @param string[] $origins         List of origins to process.
	 * @return array Array of presets where each key is a slug and each value is the preset value.
	 */
	protected static function get_settings_values_by_slug( $settings, $preset_metadata, $origins ) {
		$preset_per_origin = _wp_array_get( $settings, $preset_metadata['path'], array() );

		$result = array();
		foreach ( $origins as $origin ) {
			if ( ! isset( $preset_per_origin[ $origin ] ) ) {
				continue;
			}
			foreach ( $preset_per_origin[ $origin ] as $preset ) {
				$slug = _wp_to_kebab_case( $preset['slug'] );

				$value = '';
				if ( isset( $preset_metadata['value_key'], $preset[ $preset_metadata['value_key'] ] ) ) {
					$value_key = $preset_metadata['value_key'];
					$value     = $preset[ $value_key ];
				} elseif (
					isset( $preset_metadata['value_func'] ) &&
					is_callable( $preset_metadata['value_func'] )
				) {
					$value_func = $preset_metadata['value_func'];
					$value      = call_user_func( $value_func, $preset );
				} else {
					// If we don't have a value, then don't add it to the result.
					continue;
				}

				$result[ $slug ] = $value;
			}
		}
		return $result;
	}

	/**
	 * Similar to get_settings_values_by_slug, but doesn't compute the value.
	 *
	 * @since 5.9.0
	 *
	 * @param array    $settings        Settings to process.
	 * @param array    $preset_metadata One of the PRESETS_METADATA values.
	 * @param string[] $origins         List of origins to process.
	 * @return array Array of presets where the key and value are both the slug.
	 */
	protected static function get_settings_slugs( $settings, $preset_metadata, $origins = null ) {
		if ( null === $origins ) {
			$origins = static::VALID_ORIGINS;
		}

		$preset_per_origin = _wp_array_get( $settings, $preset_metadata['path'], array() );

		$result = array();
		foreach ( $origins as $origin ) {
			if ( ! isset( $preset_per_origin[ $origin ] ) ) {
				continue;
			}
			foreach ( $preset_per_origin[ $origin ] as $preset ) {
				$slug = _wp_to_kebab_case( $preset['slug'] );

				// Use the array as a set so we don't get duplicates.
				$result[ $slug ] = $slug;
			}
		}
		return $result;
	}

	/**
	 * Transforms a slug into a CSS Custom Property.
	 *
	 * @since 5.9.0
	 *
	 * @param string $input String to replace.
	 * @param string $slug  The slug value to use to generate the custom property.
	 * @return string The CSS Custom Property. Something along the lines of `--wp--preset--color--black`.
	 */
	protected static function replace_slug_in_string( $input, $slug ) {
		return strtr( $input, array( '$slug' => $slug ) );
	}

	/**
	 * Given the block settings, extracts the CSS Custom Properties
	 * for the presets and adds them to the $declarations array
	 * following the format:
	 *
	 *     array(
	 *       'name'  => 'property_name',
	 *       'value' => 'property_value,
	 *     )
	 *
	 * @since 5.8.0
	 * @since 5.9.0 Added the `$origins` parameter.
	 *
	 * @param array    $settings Settings to process.
	 * @param string[] $origins  List of origins to process.
	 * @return array The modified $declarations.
	 */
	protected static function compute_preset_vars( $settings, $origins ) {
		$declarations = array();
		foreach ( static::PRESETS_METADATA as $preset_metadata ) {
			if ( empty( $preset_metadata['css_vars'] ) ) {
				continue;
			}
			$values_by_slug = static::get_settings_values_by_slug( $settings, $preset_metadata, $origins );
			foreach ( $values_by_slug as $slug => $value ) {
				$declarations[] = array(
					'name'  => static::replace_slug_in_string( $preset_metadata['css_vars'], $slug ),
					'value' => $value,
				);
			}
		}

		return $declarations;
	}

	/**
	 * Given an array of settings, extracts the CSS Custom Properties
	 * for the custom values and adds them to the $declarations
	 * array following the format:
	 *
	 *     array(
	 *       'name'  => 'property_name',
	 *       'value' => 'property_value,
	 *     )
	 *
	 * @since 5.8.0
	 *
	 * @param array $settings Settings to process.
	 * @return array The modified $declarations.
	 */
	protected static function compute_theme_vars( $settings ) {
		$declarations  = array();
		$custom_values = isset( $settings['custom'] ) ? $settings['custom'] : array();
		$css_vars      = static::flatten_tree( $custom_values );
		foreach ( $css_vars as $key => $value ) {
			$declarations[] = array(
				'name'  => '--wp--custom--' . $key,
				'value' => $value,
			);
		}

		return $declarations;
	}

	/**
	 * Given a tree, it creates a flattened one
	 * by merging the keys and binding the leaf values
	 * to the new keys.
	 *
	 * It also transforms camelCase names into kebab-case
	 * and substitutes '/' by '-'.
	 *
	 * This is thought to be useful to generate
	 * CSS Custom Properties from a tree,
	 * although there's nothing in the implementation
	 * of this function that requires that format.
	 *
	 * For example, assuming the given prefix is '--wp'
	 * and the token is '--', for this input tree:
	 *
	 *     {
	 *       'some/property': 'value',
	 *       'nestedProperty': {
	 *         'sub-property': 'value'
	 *       }
	 *     }
	 *
	 * it'll return this output:
	 *
	 *     {
	 *       '--wp--some-property': 'value',
	 *       '--wp--nested-property--sub-property': 'value'
	 *     }
	 *
	 * @since 5.8.0
	 *
	 * @param array  $tree   Input tree to process.
	 * @param string $prefix Optional. Prefix to prepend to each variable. Default empty string.
	 * @param string $token  Optional. Token to use between levels. Default '--'.
	 * @return array The flattened tree.
	 */
	protected static function flatten_tree( $tree, $prefix = '', $token = '--' ) {
		$result = array();
		foreach ( $tree as $property => $value ) {
			$new_key = $prefix . str_replace(
				'/',
				'-',
				strtolower( _wp_to_kebab_case( $property ) )
			);

			if ( is_array( $value ) ) {
				$new_prefix        = $new_key . $token;
				$flattened_subtree = static::flatten_tree( $value, $new_prefix, $token );
				foreach ( $flattened_subtree as $subtree_key => $subtree_value ) {
					$result[ $subtree_key ] = $subtree_value;
				}
			} else {
				$result[ $new_key ] = $value;
			}
		}
		return $result;
	}

	/**
	 * Given a styles array, it extracts the style properties
	 * and adds them to the $declarations array following the format:
	 *
	 *     array(
	 *       'name'  => 'property_name',
	 *       'value' => 'property_value,
	 *     )
	 *
	 * @since 5.8.0
	 * @since 5.9.0 Added the `$settings` and `$properties` parameters.
	 * @since 6.1.0 Added `$theme_json`, `$selector`, and `$use_root_padding` parameters.
	 *
	 * @param array   $styles Styles to process.
	 * @param array   $settings Theme settings.
	 * @param array   $properties Properties metadata.
	 * @param array   $theme_json Theme JSON array.
	 * @param string  $selector The style block selector.
	 * @param boolean $use_root_padding Whether to add custom properties at root level.
	 * @return array  Returns the modified $declarations.
	 */
	protected static function compute_style_properties( $styles, $settings = array(), $properties = null, $theme_json = null, $selector = null, $use_root_padding = null ) {
		if ( null === $properties ) {
			$properties = static::PROPERTIES_METADATA;
		}

		$declarations = array();
		if ( empty( $styles ) ) {
			return $declarations;
		}

		$root_variable_duplicates = array();

		foreach ( $properties as $css_property => $value_path ) {
			$value = static::get_property_value( $styles, $value_path, $theme_json );

			if ( str_starts_with( $css_property, '--wp--style--root--' ) && ( static::ROOT_BLOCK_SELECTOR !== $selector || ! $use_root_padding ) ) {
				continue;
			}
			/*
			 * Root-level padding styles don't currently support strings with CSS shorthand values.
			 * This may change: https://github.com/WordPress/gutenberg/issues/40132.
			 */
			if ( '--wp--style--root--padding' === $css_property && is_string( $value ) ) {
				continue;
			}

			if ( str_starts_with( $css_property, '--wp--style--root--' ) && $use_root_padding ) {
				$root_variable_duplicates[] = substr( $css_property, strlen( '--wp--style--root--' ) );
			}

			/*
			 * Look up protected properties, keyed by value path.
			 * Skip protected properties that are explicitly set to `null`.
			 */
			if ( is_array( $value_path ) ) {
				$path_string = implode( '.', $value_path );
				if (
					isset( static::PROTECTED_PROPERTIES[ $path_string ] ) &&
					_wp_array_get( $settings, static::PROTECTED_PROPERTIES[ $path_string ], null ) === null
				) {
					continue;
				}
			}

			// Skip if empty and not "0" or value represents array of longhand values.
			$has_missing_value = empty( $value ) && ! is_numeric( $value );
			if ( $has_missing_value || is_array( $value ) ) {
				continue;
			}

			// Calculates fluid typography rules where available.
			if ( 'font-size' === $css_property ) {
				/*
				 * wp_get_typography_font_size_value() will check
				 * if fluid typography has been activated and also
				 * whether the incoming value can be converted to a fluid value.
				 * Values that already have a clamp() function will not pass the test,
				 * and therefore the original $value will be returned.
				 */
				$value = wp_get_typography_font_size_value( array( 'size' => $value ) );
			}

			$declarations[] = array(
				'name'  => $css_property,
				'value' => $value,
			);
		}

		// If a variable value is added to the root, the corresponding property should be removed.
		foreach ( $root_variable_duplicates as $duplicate ) {
			$discard = array_search( $duplicate, array_column( $declarations, 'name' ), true );
			if ( is_numeric( $discard ) ) {
				array_splice( $declarations, $discard, 1 );
			}
		}

		return $declarations;
	}

	/**
	 * Returns the style property for the given path.
	 *
	 * It also converts references to a path to the value
	 * stored at that location, e.g.
	 * { "ref": "style.color.background" } => "#fff".
	 *
	 * @since 5.8.0
	 * @since 5.9.0 Added support for values of array type, which are returned as is.
	 * @since 6.1.0 Added the `$theme_json` parameter.
	 * @since 6.3.0 It no longer converts the internal format "var:preset|color|secondary"
	 *              to the standard form "--wp--preset--color--secondary".
	 *              This is already done by the sanitize method,
	 *              so every property will be in the standard form.
	 *
	 * @param array $styles Styles subtree.
	 * @param array $path   Which property to process.
	 * @param array $theme_json Theme JSON array.
	 * @return string|array Style property value.
	 */
	protected static function get_property_value( $styles, $path, $theme_json = null ) {
		$value = _wp_array_get( $styles, $path, '' );

		if ( '' === $value || null === $value ) {
			// No need to process the value further.
			return '';
		}

		/*
		 * This converts references to a path to the value at that path
		 * where the values is an array with a "ref" key, pointing to a path.
		 * For example: { "ref": "style.color.background" } => "#fff".
		 */
		if ( is_array( $value ) && isset( $value['ref'] ) ) {
			$value_path = explode( '.', $value['ref'] );
			$ref_value  = _wp_array_get( $theme_json, $value_path );
			// Only use the ref value if we find anything.
			if ( ! empty( $ref_value ) && is_string( $ref_value ) ) {
				$value = $ref_value;
			}

			if ( is_array( $ref_value ) && isset( $ref_value['ref'] ) ) {
				$path_string      = json_encode( $path );
				$ref_value_string = json_encode( $ref_value );
				_doing_it_wrong(
					'get_property_value',
					sprintf(
						/* translators: 1: theme.json, 2: Value name, 3: Value path, 4: Another value name. */
						__( 'Your %1$s file uses a dynamic value (%2$s) for the path at %3$s. However, the value at %3$s is also a dynamic value (pointing to %4$s) and pointing to another dynamic value is not supported. Please update %3$s to point directly to %4$s.' ),
						'theme.json',
						$ref_value_string,
						$path_string,
						$ref_value['ref']
					),
					'6.1.0'
				);
			}
		}

		if ( is_array( $value ) ) {
			return $value;
		}

		return $value;
	}

	/**
	 * Builds metadata for the setting nodes, which returns in the form of:
	 *
	 *     [
	 *       [
	 *         'path'     => ['path', 'to', 'some', 'node' ],
	 *         'selector' => 'CSS selector for some node'
	 *       ],
	 *       [
	 *         'path'     => [ 'path', 'to', 'other', 'node' ],
	 *         'selector' => 'CSS selector for other node'
	 *       ],
	 *     ]
	 *
	 * @since 5.8.0
	 *
	 * @param array $theme_json The tree to extract setting nodes from.
	 * @param array $selectors  List of selectors per block.
	 * @return array An array of setting nodes metadata.
	 */
	protected static function get_setting_nodes( $theme_json, $selectors = array() ) {
		$nodes = array();
		if ( ! isset( $theme_json['settings'] ) ) {
			return $nodes;
		}

		// Top-level.
		$nodes[] = array(
			'path'     => array( 'settings' ),
			'selector' => static::ROOT_BLOCK_SELECTOR,
		);

		// Calculate paths for blocks.
		if ( ! isset( $theme_json['settings']['blocks'] ) ) {
			return $nodes;
		}

		foreach ( $theme_json['settings']['blocks'] as $name => $node ) {
			$selector = null;
			if ( isset( $selectors[ $name ]['selector'] ) ) {
				$selector = $selectors[ $name ]['selector'];
			}

			$nodes[] = array(
				'path'     => array( 'settings', 'blocks', $name ),
				'selector' => $selector,
			);
		}

		return $nodes;
	}

	/**
	 * Builds metadata for the style nodes, which returns in the form of:
	 *
	 *     [
	 *       [
	 *         'path'     => [ 'path', 'to', 'some', 'node' ],
	 *         'selector' => 'CSS selector for some node',
	 *         'duotone'  => 'CSS selector for duotone for some node'
	 *       ],
	 *       [
	 *         'path'     => ['path', 'to', 'other', 'node' ],
	 *         'selector' => 'CSS selector for other node',
	 *         'duotone'  => null
	 *       ],
	 *     ]
	 *
	 * @since 5.8.0
	 *
	 * @param array $theme_json The tree to extract style nodes from.
	 * @param array $selectors  List of selectors per block.
	 * @return array An array of style nodes metadata.
	 */
	protected static function get_style_nodes( $theme_json, $selectors = array() ) {
		$nodes = array();
		if ( ! isset( $theme_json['styles'] ) ) {
			return $nodes;
		}

		// Top-level.
		$nodes[] = array(
			'path'     => array( 'styles' ),
			'selector' => static::ROOT_BLOCK_SELECTOR,
		);

		if ( isset( $theme_json['styles']['elements'] ) ) {
			foreach ( self::ELEMENTS as $element => $selector ) {
				if ( ! isset( $theme_json['styles']['elements'][ $element ] ) ) {
					continue;
				}
				$nodes[] = array(
					'path'     => array( 'styles', 'elements', $element ),
					'selector' => static::ELEMENTS[ $element ],
				);

				// Handle any pseudo selectors for the element.
				if ( isset( static::VALID_ELEMENT_PSEUDO_SELECTORS[ $element ] ) ) {
					foreach ( static::VALID_ELEMENT_PSEUDO_SELECTORS[ $element ] as $pseudo_selector ) {

						if ( isset( $theme_json['styles']['elements'][ $element ][ $pseudo_selector ] ) ) {
							$nodes[] = array(
								'path'     => array( 'styles', 'elements', $element ),
								'selector' => static::append_to_selector( static::ELEMENTS[ $element ], $pseudo_selector ),
							);
						}
					}
				}
			}
		}

		// Blocks.
		if ( ! isset( $theme_json['styles']['blocks'] ) ) {
			return $nodes;
		}

		$block_nodes = static::get_block_nodes( $theme_json );
		foreach ( $block_nodes as $block_node ) {
			$nodes[] = $block_node;
		}

		/**
		 * Filters the list of style nodes with metadata.
		 *
		 * This allows for things like loading block CSS independently.
		 *
		 * @since 6.1.0
		 *
		 * @param array $nodes Style nodes with metadata.
		 */
		return apply_filters( 'wp_theme_json_get_style_nodes', $nodes );
	}

	/**
	 * A public helper to get the block nodes from a theme.json file.
	 *
	 * @since 6.1.0
	 *
	 * @return array The block nodes in theme.json.
	 */
	public function get_styles_block_nodes() {
		return static::get_block_nodes( $this->theme_json );
	}

	/**
	 * Returns a filtered declarations array if there is a separator block with only a background
	 * style defined in theme.json by adding a color attribute to reflect the changes in the front.
	 *
	 * @since 6.1.1
	 *
	 * @param array $declarations List of declarations.
	 * @return array $declarations List of declarations filtered.
	 */
	private static function update_separator_declarations( $declarations ) {
		$background_color     = '';
		$border_color_matches = false;
		$text_color_matches   = false;

		foreach ( $declarations as $declaration ) {
			if ( 'background-color' === $declaration['name'] && ! $background_color && isset( $declaration['value'] ) ) {
				$background_color = $declaration['value'];
			} elseif ( 'border-color' === $declaration['name'] ) {
				$border_color_matches = true;
			} elseif ( 'color' === $declaration['name'] ) {
				$text_color_matches = true;
			}

			if ( $background_color && $border_color_matches && $text_color_matches ) {
				break;
			}
		}

		if ( $background_color && ! $border_color_matches && ! $text_color_matches ) {
			$declarations[] = array(
				'name'  => 'color',
				'value' => $background_color,
			);
		}

		return $declarations;
	}

	/**
	 * An internal method to get the block nodes from a theme.json file.
	 *
	 * @since 6.1.0
	 * @since 6.3.0 Refactored and stabilized selectors API.
	 *
	 * @param array $theme_json The theme.json converted to an array.
	 * @return array The block nodes in theme.json.
	 */
	private static function get_block_nodes( $theme_json ) {
		$selectors = static::get_blocks_metadata();
		$nodes     = array();
		if ( ! isset( $theme_json['styles'] ) ) {
			return $nodes;
		}

		// Blocks.
		if ( ! isset( $theme_json['styles']['blocks'] ) ) {
			return $nodes;
		}

		foreach ( $theme_json['styles']['blocks'] as $name => $node ) {
			$selector = null;
			if ( isset( $selectors[ $name ]['selector'] ) ) {
				$selector = $selectors[ $name ]['selector'];
			}

			$duotone_selector = null;
			if ( isset( $selectors[ $name ]['duotone'] ) ) {
				$duotone_selector = $selectors[ $name ]['duotone'];
			}

			$feature_selectors = null;
			if ( isset( $selectors[ $name ]['selectors'] ) ) {
				$feature_selectors = $selectors[ $name ]['selectors'];
			}

			$variation_selectors = array();
			if ( isset( $node['variations'] ) ) {
				foreach ( $node['variations'] as $variation => $node ) {
					$variation_selectors[] = array(
						'path'     => array( 'styles', 'blocks', $name, 'variations', $variation ),
						'selector' => $selectors[ $name ]['styleVariations'][ $variation ],
					);
				}
			}

			$nodes[] = array(
				'name'       => $name,
				'path'       => array( 'styles', 'blocks', $name ),
				'selector'   => $selector,
				'selectors'  => $feature_selectors,
				'duotone'    => $duotone_selector,
				'features'   => $feature_selectors,
				'variations' => $variation_selectors,
			);

			if ( isset( $theme_json['styles']['blocks'][ $name ]['elements'] ) ) {
				foreach ( $theme_json['styles']['blocks'][ $name ]['elements'] as $element => $node ) {
					$nodes[] = array(
						'path'     => array( 'styles', 'blocks', $name, 'elements', $element ),
						'selector' => $selectors[ $name ]['elements'][ $element ],
					);

					// Handle any pseudo selectors for the element.
					if ( isset( static::VALID_ELEMENT_PSEUDO_SELECTORS[ $element ] ) ) {
						foreach ( static::VALID_ELEMENT_PSEUDO_SELECTORS[ $element ] as $pseudo_selector ) {
							if ( isset( $theme_json['styles']['blocks'][ $name ]['elements'][ $element ][ $pseudo_selector ] ) ) {
								$nodes[] = array(
									'path'     => array( 'styles', 'blocks', $name, 'elements', $element ),
									'selector' => static::append_to_selector( $selectors[ $name ]['elements'][ $element ], $pseudo_selector ),
								);
							}
						}
					}
				}
			}
		}

		return $nodes;
	}

	/**
	 * Gets the CSS rules for a particular block from theme.json.
	 *
	 * @since 6.1.0
	 *
	 * @param array $block_metadata Metadata about the block to get styles for.
	 *
	 * @return string Styles for the block.
	 */
	public function get_styles_for_block( $block_metadata ) {
		$node                 = _wp_array_get( $this->theme_json, $block_metadata['path'], array() );
		$use_root_padding     = isset( $this->theme_json['settings']['useRootPaddingAwareAlignments'] ) && true === $this->theme_json['settings']['useRootPaddingAwareAlignments'];
		$selector             = $block_metadata['selector'];
		$settings             = isset( $this->theme_json['settings'] ) ? $this->theme_json['settings'] : array();
		$feature_declarations = static::get_feature_declarations_for_node( $block_metadata, $node );

		// If there are style variations, generate the declarations for them, including any feature selectors the block may have.
		$style_variation_declarations = array();
		if ( ! empty( $block_metadata['variations'] ) ) {
			foreach ( $block_metadata['variations'] as $style_variation ) {
				$style_variation_node           = _wp_array_get( $this->theme_json, $style_variation['path'], array() );
				$clean_style_variation_selector = trim( $style_variation['selector'] );

				// Generate any feature/subfeature style declarations for the current style variation.
				$variation_declarations = static::get_feature_declarations_for_node( $block_metadata, $style_variation_node );

				// Combine selectors with style variation's selector and add to overall style variation declarations.
				foreach ( $variation_declarations as $current_selector => $new_declarations ) {
					// If current selector includes block classname, remove it but leave the whitespace in.
					$shortened_selector = str_replace( $block_metadata['selector'] . ' ', ' ', $current_selector );

					// Prepend the variation selector to the current selector.
					$split_selectors    = explode( ',', $shortened_selector );
					$updated_selectors  = array_map(
						static function ( $split_selector ) use ( $clean_style_variation_selector ) {
							return $clean_style_variation_selector . $split_selector;
						},
						$split_selectors
					);
					$combined_selectors = implode( ',', $updated_selectors );

					// Add the new declarations to the overall results under the modified selector.
					$style_variation_declarations[ $combined_selectors ] = $new_declarations;
				}

				// Compute declarations for remaining styles not covered by feature level selectors.
				$style_variation_declarations[ $style_variation['selector'] ] = static::compute_style_properties( $style_variation_node, $settings, null, $this->theme_json );
			}
		}
		/*
		 * Get a reference to element name from path.
		 * $block_metadata['path'] = array( 'styles','elements','link' );
		 * Make sure that $block_metadata['path'] describes an element node, like [ 'styles', 'element', 'link' ].
		 * Skip non-element paths like just ['styles'].
		 */
		$is_processing_element = in_array( 'elements', $block_metadata['path'], true );

		$current_element = $is_processing_element ? $block_metadata['path'][ count( $block_metadata['path'] ) - 1 ] : null;

		$element_pseudo_allowed = array();

		if ( isset( static::VALID_ELEMENT_PSEUDO_SELECTORS[ $current_element ] ) ) {
			$element_pseudo_allowed = static::VALID_ELEMENT_PSEUDO_SELECTORS[ $current_element ];
		}

		/*
		 * Check for allowed pseudo classes (e.g. ":hover") from the $selector ("a:hover").
		 * This also resets the array keys.
		 */
		$pseudo_matches = array_values(
			array_filter(
				$element_pseudo_allowed,
				static function ( $pseudo_selector ) use ( $selector ) {
					return str_contains( $selector, $pseudo_selector );
				}
			)
		);

		$pseudo_selector = isset( $pseudo_matches[0] ) ? $pseudo_matches[0] : null;

		/*
		 * If the current selector is a pseudo selector that's defined in the allow list for the current
		 * element then compute the style properties for it.
		 * Otherwise just compute the styles for the default selector as normal.
		 */
		if ( $pseudo_selector && isset( $node[ $pseudo_selector ] ) &&
			isset( static::VALID_ELEMENT_PSEUDO_SELECTORS[ $current_element ] )
			&& in_array( $pseudo_selector, static::VALID_ELEMENT_PSEUDO_SELECTORS[ $current_element ], true )
		) {
			$declarations = static::compute_style_properties( $node[ $pseudo_selector ], $settings, null, $this->theme_json, $selector, $use_root_padding );
		} else {
			$declarations = static::compute_style_properties( $node, $settings, null, $this->theme_json, $selector, $use_root_padding );
		}

		$block_rules = '';

		/*
		 * 1. Separate the declarations that use the general selector
		 * from the ones using the duotone selector.
		 */
		$declarations_duotone = array();
		foreach ( $declarations as $index => $declaration ) {
			if ( 'filter' === $declaration['name'] ) {
				unset( $declarations[ $index ] );
				$declarations_duotone[] = $declaration;
			}
		}

		// Update declarations if there are separators with only background color defined.
		if ( '.wp-block-separator' === $selector ) {
			$declarations = static::update_separator_declarations( $declarations );
		}

		// 2. Generate and append the rules that use the general selector.
		$block_rules .= static::to_ruleset( $selector, $declarations );

		// 3. Generate and append the rules that use the duotone selector.
		if ( isset( $block_metadata['duotone'] ) && ! empty( $declarations_duotone ) ) {
			$block_rules .= static::to_ruleset( $block_metadata['duotone'], $declarations_duotone );
		}

		// 4. Generate Layout block gap styles.
		if (
			static::ROOT_BLOCK_SELECTOR !== $selector &&
			! empty( $block_metadata['name'] )
		) {
			$block_rules .= $this->get_layout_styles( $block_metadata );
		}

		// 5. Generate and append the feature level rulesets.
		foreach ( $feature_declarations as $feature_selector => $individual_feature_declarations ) {
			$block_rules .= static::to_ruleset( $feature_selector, $individual_feature_declarations );
		}

		// 6. Generate and append the style variation rulesets.
		foreach ( $style_variation_declarations as $style_variation_selector => $individual_style_variation_declarations ) {
			$block_rules .= static::to_ruleset( $style_variation_selector, $individual_style_variation_declarations );
		}

		return $block_rules;
	}

	/**
	 * Outputs the CSS for layout rules on the root.
	 *
	 * @since 6.1.0
	 *
	 * @param string $selector The root node selector.
	 * @param array  $block_metadata The metadata for the root block.
	 * @return string The additional root rules CSS.
	 */
	public function get_root_layout_rules( $selector, $block_metadata ) {
		$css              = '';
		$settings         = isset( $this->theme_json['settings'] ) ? $this->theme_json['settings'] : array();
		$use_root_padding = isset( $this->theme_json['settings']['useRootPaddingAwareAlignments'] ) && true === $this->theme_json['settings']['useRootPaddingAwareAlignments'];

		/*
		* Reset default browser margin on the root body element.
		* This is set on the root selector **before** generating the ruleset
		* from the `theme.json`. This is to ensure that if the `theme.json` declares
		* `margin` in its `spacing` declaration for the `body` element then these
		* user-generated values take precedence in the CSS cascade.
		* @link https://github.com/WordPress/gutenberg/issues/36147.
		*/
		$css .= 'body { margin: 0;';

		/*
		* If there are content and wide widths in theme.json, output them
		* as custom properties on the body element so all blocks can use them.
		*/
		if ( isset( $settings['layout']['contentSize'] ) || isset( $settings['layout']['wideSize'] ) ) {
			$content_size = isset( $settings['layout']['contentSize'] ) ? $settings['layout']['contentSize'] : $settings['layout']['wideSize'];
			$content_size = static::is_safe_css_declaration( 'max-width', $content_size ) ? $content_size : 'initial';
			$wide_size    = isset( $settings['layout']['wideSize'] ) ? $settings['layout']['wideSize'] : $settings['layout']['contentSize'];
			$wide_size    = static::is_safe_css_declaration( 'max-width', $wide_size ) ? $wide_size : 'initial';
			$css         .= '--wp--style--global--content-size: ' . $content_size . ';';
			$css         .= '--wp--style--global--wide-size: ' . $wide_size . ';';
		}

		$css .= ' }';

		if ( $use_root_padding ) {
			// Top and bottom padding are applied to the outer block container.
			$css .= '.wp-site-blocks { padding-top: var(--wp--style--root--padding-top); padding-bottom: var(--wp--style--root--padding-bottom); }';
			// Right and left padding are applied to the first container with `.has-global-padding` class.
			$css .= '.has-global-padding { padding-right: var(--wp--style--root--padding-right); padding-left: var(--wp--style--root--padding-left); }';
			// Nested containers with `.has-global-padding` class do not get padding.
			$css .= '.has-global-padding :where(.has-global-padding:not(.wp-block-block)) { padding-right: 0; padding-left: 0; }';
			// Alignfull children of the container with left and right padding have negative margins so they can still be full width.
			$css .= '.has-global-padding > .alignfull { margin-right: calc(var(--wp--style--root--padding-right) * -1); margin-left: calc(var(--wp--style--root--padding-left) * -1); }';
			// The above rule is negated for alignfull children of nested containers.
			$css .= '.has-global-padding :where(.has-global-padding:not(.wp-block-block)) > .alignfull { margin-right: 0; margin-left: 0; }';
			// Some of the children of alignfull blocks without content width should also get padding: text blocks and non-alignfull container blocks.
			$css .= '.has-global-padding > .alignfull:where(:not(.has-global-padding):not(.is-layout-flex):not(.is-layout-grid)) > :where([class*="wp-block-"]:not(.alignfull):not([class*="__"]),p,h1,h2,h3,h4,h5,h6,ul,ol) { padding-right: var(--wp--style--root--padding-right); padding-left: var(--wp--style--root--padding-left); }';
			// The above rule also has to be negated for blocks inside nested `.has-global-padding` blocks.
			$css .= '.has-global-padding :where(.has-global-padding) > .alignfull:where(:not(.has-global-padding)) > :where([class*="wp-block-"]:not(.alignfull):not([class*="__"]),p,h1,h2,h3,h4,h5,h6,ul,ol) { padding-right: 0; padding-left: 0; }';
		}

		$css .= '.wp-site-blocks > .alignleft { float: left; margin-right: 2em; }';
		$css .= '.wp-site-blocks > .alignright { float: right; margin-left: 2em; }';
		$css .= '.wp-site-blocks > .aligncenter { justify-content: center; margin-left: auto; margin-right: auto; }';

		$block_gap_value       = isset( $this->theme_json['styles']['spacing']['blockGap'] ) ? $this->theme_json['styles']['spacing']['blockGap'] : '0.5em';
		$has_block_gap_support = isset( $this->theme_json['settings']['spacing']['blockGap'] );
		if ( $has_block_gap_support ) {
			$block_gap_value = static::get_property_value( $this->theme_json, array( 'styles', 'spacing', 'blockGap' ) );
			$css            .= ":where(.wp-site-blocks) > * { margin-block-start: $block_gap_value; margin-block-end: 0; }";
			$css            .= ':where(.wp-site-blocks) > :first-child:first-child { margin-block-start: 0; }';
			$css            .= ':where(.wp-site-blocks) > :last-child:last-child { margin-block-end: 0; }';

			// For backwards compatibility, ensure the legacy block gap CSS variable is still available.
			$css .= "$selector { --wp--style--block-gap: $block_gap_value; }";
		}
		$css .= $this->get_layout_styles( $block_metadata );

		return $css;
	}

	/**
	 * For metadata values that can either be booleans or paths to booleans, gets the value.
	 *
	 *     $data = array(
	 *       'color' => array(
	 *         'defaultPalette' => true
	 *       )
	 *     );
	 *
	 *     static::get_metadata_boolean( $data, false );
	 *     // => false
	 *
	 *     static::get_metadata_boolean( $data, array( 'color', 'defaultPalette' ) );
	 *     // => true
	 *
	 * @since 6.0.0
	 *
	 * @param array      $data          The data to inspect.
	 * @param bool|array $path          Boolean or path to a boolean.
	 * @param bool       $default_value Default value if the referenced path is missing.
	 *                                  Default false.
	 * @return bool Value of boolean metadata.
	 */
	protected static function get_metadata_boolean( $data, $path, $default_value = false ) {
		if ( is_bool( $path ) ) {
			return $path;
		}

		if ( is_array( $path ) ) {
			$value = _wp_array_get( $data, $path );
			if ( null !== $value ) {
				return $value;
			}
		}

		return $default_value;
	}

	/**
	 * Merges new incoming data.
	 *
	 * @since 5.8.0
	 * @since 5.9.0 Duotone preset also has origins.
	 *
	 * @param WP_Theme_JSON $incoming Data to merge.
	 */
	public function merge( $incoming ) {
		$incoming_data    = $incoming->get_raw_data();
		$this->theme_json = array_replace_recursive( $this->theme_json, $incoming_data );

		/*
		 * The array_replace_recursive algorithm merges at the leaf level,
		 * but we don't want leaf arrays to be merged, so we overwrite it.
		 *
		 * For leaf values that are sequential arrays it will use the numeric indexes for replacement.
		 * We rather replace the existing with the incoming value, if it exists.
		 * This is the case of spacing.units.
		 *
		 * For leaf values that are associative arrays it will merge them as expected.
		 * This is also not the behavior we want for the current associative arrays (presets).
		 * We rather replace the existing with the incoming value, if it exists.
		 * This happens, for example, when we merge data from theme.json upon existing
		 * theme supports or when we merge anything coming from the same source twice.
		 * This is the case of color.palette, color.gradients, color.duotone,
		 * typography.fontSizes, or typography.fontFamilies.
		 *
		 * Additionally, for some preset types, we also want to make sure the
		 * values they introduce don't conflict with default values. We do so
		 * by checking the incoming slugs for theme presets and compare them
		 * with the equivalent default presets: if a slug is present as a default
		 * we remove it from the theme presets.
		 */
		$nodes        = static::get_setting_nodes( $incoming_data );
		$slugs_global = static::get_default_slugs( $this->theme_json, array( 'settings' ) );
		foreach ( $nodes as $node ) {
			// Replace the spacing.units.
			$path   = $node['path'];
			$path[] = 'spacing';
			$path[] = 'units';

			$content = _wp_array_get( $incoming_data, $path, null );
			if ( isset( $content ) ) {
				_wp_array_set( $this->theme_json, $path, $content );
			}

			// Replace the presets.
			foreach ( static::PRESETS_METADATA as $preset ) {
				$override_preset = ! static::get_metadata_boolean( $this->theme_json['settings'], $preset['prevent_override'], true );

				foreach ( static::VALID_ORIGINS as $origin ) {
					$base_path = $node['path'];
					foreach ( $preset['path'] as $leaf ) {
						$base_path[] = $leaf;
					}

					$path   = $base_path;
					$path[] = $origin;

					$content = _wp_array_get( $incoming_data, $path, null );
					if ( ! isset( $content ) ) {
						continue;
					}

					if ( 'theme' === $origin && $preset['use_default_names'] ) {
						foreach ( $content as $key => $item ) {
							if ( ! isset( $item['name'] ) ) {
								$name = static::get_name_from_defaults( $item['slug'], $base_path );
								if ( null !== $name ) {
									$content[ $key ]['name'] = $name;
								}
							}
						}
					}

					if (
						( 'theme' !== $origin ) ||
						( 'theme' === $origin && $override_preset )
					) {
						_wp_array_set( $this->theme_json, $path, $content );
					} else {
						$slugs_node = static::get_default_slugs( $this->theme_json, $node['path'] );
						$slugs      = array_merge_recursive( $slugs_global, $slugs_node );

						$slugs_for_preset = _wp_array_get( $slugs, $preset['path'], array() );
						$content          = static::filter_slugs( $content, $slugs_for_preset );
						_wp_array_set( $this->theme_json, $path, $content );
					}
				}
			}
		}
	}

	/**
	 * Converts all filter (duotone) presets into SVGs.
	 *
	 * @since 5.9.1
	 *
	 * @param array $origins List of origins to process.
	 * @return string SVG filters.
	 */
	public function get_svg_filters( $origins ) {
		$blocks_metadata = static::get_blocks_metadata();
		$setting_nodes   = static::get_setting_nodes( $this->theme_json, $blocks_metadata );

		$filters = '';
		foreach ( $setting_nodes as $metadata ) {
			$node = _wp_array_get( $this->theme_json, $metadata['path'], array() );
			if ( empty( $node['color']['duotone'] ) ) {
				continue;
			}

			$duotone_presets = $node['color']['duotone'];

			foreach ( $origins as $origin ) {
				if ( ! isset( $duotone_presets[ $origin ] ) ) {
					continue;
				}
				foreach ( $duotone_presets[ $origin ] as $duotone_preset ) {
					$filters .= wp_get_duotone_filter_svg( $duotone_preset );
				}
			}
		}

		return $filters;
	}

	/**
	 * Determines whether a presets should be overridden or not.
	 *
	 * @since 5.9.0
	 * @deprecated 6.0.0 Use {@see 'get_metadata_boolean'} instead.
	 *
	 * @param array      $theme_json The theme.json like structure to inspect.
	 * @param array      $path       Path to inspect.
	 * @param bool|array $override   Data to compute whether to override the preset.
	 * @return bool
	 */
	protected static function should_override_preset( $theme_json, $path, $override ) {
		_deprecated_function( __METHOD__, '6.0.0', 'get_metadata_boolean' );

		if ( is_bool( $override ) ) {
			return $override;
		}

		/*
		 * The relationship between whether to override the defaults
		 * and whether the defaults are enabled is inverse:
		 *
		 * - If defaults are enabled  => theme presets should not be overridden
		 * - If defaults are disabled => theme presets should be overridden
		 *
		 * For example, a theme sets defaultPalette to false,
		 * making the default palette hidden from the user.
		 * In that case, we want all the theme presets to be present,
		 * so they should override the defaults.
		 */
		if ( is_array( $override ) ) {
			$value = _wp_array_get( $theme_json, array_merge( $path, $override ) );
			if ( isset( $value ) ) {
				return ! $value;
			}

			// Search the top-level key if none was found for this node.
			$value = _wp_array_get( $theme_json, array_merge( array( 'settings' ), $override ) );
			if ( isset( $value ) ) {
				return ! $value;
			}

			return true;
		}
	}

	/**
	 * Returns the default slugs for all the presets in an associative array
	 * whose keys are the preset paths and the leafs is the list of slugs.
	 *
	 * For example:
	 *
	 *     array(
	 *       'color' => array(
	 *         'palette'   => array( 'slug-1', 'slug-2' ),
	 *         'gradients' => array( 'slug-3', 'slug-4' ),
	 *       ),
	 *     )
	 *
	 * @since 5.9.0
	 *
	 * @param array $data      A theme.json like structure.
	 * @param array $node_path The path to inspect. It's 'settings' by default.
	 * @return array
	 */
	protected static function get_default_slugs( $data, $node_path ) {
		$slugs = array();

		foreach ( static::PRESETS_METADATA as $metadata ) {
			$path = $node_path;
			foreach ( $metadata['path'] as $leaf ) {
				$path[] = $leaf;
			}
			$path[] = 'default';

			$preset = _wp_array_get( $data, $path, null );
			if ( ! isset( $preset ) ) {
				continue;
			}

			$slugs_for_preset = array();
			foreach ( $preset as $item ) {
				if ( isset( $item['slug'] ) ) {
					$slugs_for_preset[] = $item['slug'];
				}
			}

			_wp_array_set( $slugs, $metadata['path'], $slugs_for_preset );
		}

		return $slugs;
	}

	/**
	 * Gets a `default`'s preset name by a provided slug.
	 *
	 * @since 5.9.0
	 *
	 * @param string $slug The slug we want to find a match from default presets.
	 * @param array  $base_path The path to inspect. It's 'settings' by default.
	 * @return string|null
	 */
	protected function get_name_from_defaults( $slug, $base_path ) {
		$path            = $base_path;
		$path[]          = 'default';
		$default_content = _wp_array_get( $this->theme_json, $path, null );
		if ( ! $default_content ) {
			return null;
		}
		foreach ( $default_content as $item ) {
			if ( $slug === $item['slug'] ) {
				return $item['name'];
			}
		}
		return null;
	}

	/**
	 * Removes the preset values whose slug is equal to any of given slugs.
	 *
	 * @since 5.9.0
	 *
	 * @param array $node  The node with the presets to validate.
	 * @param array $slugs The slugs that should not be overridden.
	 * @return array The new node.
	 */
	protected static function filter_slugs( $node, $slugs ) {
		if ( empty( $slugs ) ) {
			return $node;
		}

		$new_node = array();
		foreach ( $node as $value ) {
			if ( isset( $value['slug'] ) && ! in_array( $value['slug'], $slugs, true ) ) {
				$new_node[] = $value;
			}
		}

		return $new_node;
	}

	/**
	 * Removes insecure data from theme.json.
	 *
	 * @since 5.9.0
	 * @since 6.3.2 Preserves global styles block variations when securing styles.
	 *
	 * @param array $theme_json Structure to sanitize.
	 * @return array Sanitized structure.
	 */
	public static function remove_insecure_properties( $theme_json ) {
		$sanitized = array();

		$theme_json = WP_Theme_JSON_Schema::migrate( $theme_json );

		$valid_block_names   = array_keys( static::get_blocks_metadata() );
		$valid_element_names = array_keys( static::ELEMENTS );
		$valid_variations    = array();
		foreach ( self::get_blocks_metadata() as $block_name => $block_meta ) {
			if ( ! isset( $block_meta['styleVariations'] ) ) {
				continue;
			}
			$valid_variations[ $block_name ] = array_keys( $block_meta['styleVariations'] );
		}

		$theme_json = static::sanitize( $theme_json, $valid_block_names, $valid_element_names, $valid_variations );

		$blocks_metadata = static::get_blocks_metadata();
		$style_nodes     = static::get_style_nodes( $theme_json, $blocks_metadata );

		foreach ( $style_nodes as $metadata ) {
			$input = _wp_array_get( $theme_json, $metadata['path'], array() );
			if ( empty( $input ) ) {
				continue;
			}

			// The global styles custom CSS is not sanitized, but can only be edited by users with 'edit_css' capability.
			if ( isset( $input['css'] ) && current_user_can( 'edit_css' ) ) {
				$output = $input;
			} else {
				$output = static::remove_insecure_styles( $input );
			}

			/*
			 * Get a reference to element name from path.
			 * $metadata['path'] = array( 'styles', 'elements', 'link' );
			 */
			$current_element = $metadata['path'][ count( $metadata['path'] ) - 1 ];

			/*
			 * $output is stripped of pseudo selectors. Re-add and process them
			 * or insecure styles here.
			 */
			if ( isset( static::VALID_ELEMENT_PSEUDO_SELECTORS[ $current_element ] ) ) {
				foreach ( static::VALID_ELEMENT_PSEUDO_SELECTORS[ $current_element ] as $pseudo_selector ) {
					if ( isset( $input[ $pseudo_selector ] ) ) {
						$output[ $pseudo_selector ] = static::remove_insecure_styles( $input[ $pseudo_selector ] );
					}
				}
			}

			if ( ! empty( $output ) ) {
				_wp_array_set( $sanitized, $metadata['path'], $output );
			}

			if ( isset( $metadata['variations'] ) ) {
				foreach ( $metadata['variations'] as $variation ) {
					$variation_input = _wp_array_get( $theme_json, $variation['path'], array() );
					if ( empty( $variation_input ) ) {
						continue;
					}

					$variation_output = static::remove_insecure_styles( $variation_input );
					if ( ! empty( $variation_output ) ) {
						_wp_array_set( $sanitized, $variation['path'], $variation_output );
					}
				}
			}
		}

		$setting_nodes = static::get_setting_nodes( $theme_json );
		foreach ( $setting_nodes as $metadata ) {
			$input = _wp_array_get( $theme_json, $metadata['path'], array() );
			if ( empty( $input ) ) {
				continue;
			}

			$output = static::remove_insecure_settings( $input );
			if ( ! empty( $output ) ) {
				_wp_array_set( $sanitized, $metadata['path'], $output );
			}
		}

		if ( empty( $sanitized['styles'] ) ) {
			unset( $theme_json['styles'] );
		} else {
			$theme_json['styles'] = $sanitized['styles'];
		}

		if ( empty( $sanitized['settings'] ) ) {
			unset( $theme_json['settings'] );
		} else {
			$theme_json['settings'] = $sanitized['settings'];
		}

		return $theme_json;
	}

	/**
	 * Processes a setting node and returns the same node
	 * without the insecure settings.
	 *
	 * @since 5.9.0
	 *
	 * @param array $input Node to process.
	 * @return array
	 */
	protected static function remove_insecure_settings( $input ) {
		$output = array();
		foreach ( static::PRESETS_METADATA as $preset_metadata ) {
			foreach ( static::VALID_ORIGINS as $origin ) {
				$path_with_origin   = $preset_metadata['path'];
				$path_with_origin[] = $origin;
				$presets            = _wp_array_get( $input, $path_with_origin, null );
				if ( null === $presets ) {
					continue;
				}

				$escaped_preset = array();
				foreach ( $presets as $preset ) {
					if (
						esc_attr( esc_html( $preset['name'] ) ) === $preset['name'] &&
						sanitize_html_class( $preset['slug'] ) === $preset['slug']
					) {
						$value = null;
						if ( isset( $preset_metadata['value_key'], $preset[ $preset_metadata['value_key'] ] ) ) {
							$value = $preset[ $preset_metadata['value_key'] ];
						} elseif (
							isset( $preset_metadata['value_func'] ) &&
							is_callable( $preset_metadata['value_func'] )
						) {
							$value = call_user_func( $preset_metadata['value_func'], $preset );
						}

						$preset_is_valid = true;
						foreach ( $preset_metadata['properties'] as $property ) {
							if ( ! static::is_safe_css_declaration( $property, $value ) ) {
								$preset_is_valid = false;
								break;
							}
						}

						if ( $preset_is_valid ) {
							$escaped_preset[] = $preset;
						}
					}
				}

				if ( ! empty( $escaped_preset ) ) {
					_wp_array_set( $output, $path_with_origin, $escaped_preset );
				}
			}
		}

		// Ensure indirect properties not included in any `PRESETS_METADATA` value are allowed.
		static::remove_indirect_properties( $input, $output );

		return $output;
	}

	/**
	 * Processes a style node and returns the same node
	 * without the insecure styles.
	 *
	 * @since 5.9.0
	 *
	 * @param array $input Node to process.
	 * @return array
	 */
	protected static function remove_insecure_styles( $input ) {
		$output       = array();
		$declarations = static::compute_style_properties( $input );

		foreach ( $declarations as $declaration ) {
			if ( static::is_safe_css_declaration( $declaration['name'], $declaration['value'] ) ) {
				$path = static::PROPERTIES_METADATA[ $declaration['name'] ];

				/*
				 * Check the value isn't an array before adding so as to not
				 * double up shorthand and longhand styles.
				 */
				$value = _wp_array_get( $input, $path, array() );
				if ( ! is_array( $value ) ) {
					_wp_array_set( $output, $path, $value );
				}
			}
		}

		// Ensure indirect properties not handled by `compute_style_properties` are allowed.
		static::remove_indirect_properties( $input, $output );

		return $output;
	}

	/**
	 * Checks that a declaration provided by the user is safe.
	 *
	 * @since 5.9.0
	 *
	 * @param string $property_name  Property name in a CSS declaration, i.e. the `color` in `color: red`.
	 * @param string $property_value Value in a CSS declaration, i.e. the `red` in `color: red`.
	 * @return bool
	 */
	protected static function is_safe_css_declaration( $property_name, $property_value ) {
		$style_to_validate = $property_name . ': ' . $property_value;
		$filtered          = esc_html( safecss_filter_attr( $style_to_validate ) );
		return ! empty( trim( $filtered ) );
	}

	/**
	 * Removes indirect properties from the given input node and
	 * sets in the given output node.
	 *
	 * @since 6.2.0
	 *
	 * @param array $input  Node to process.
	 * @param array $output The processed node. Passed by reference.
	 */
	private static function remove_indirect_properties( $input, &$output ) {
		foreach ( static::INDIRECT_PROPERTIES_METADATA as $property => $paths ) {
			foreach ( $paths as $path ) {
				$value = _wp_array_get( $input, $path );
				if (
					is_string( $value ) &&
					static::is_safe_css_declaration( $property, $value )
				) {
					_wp_array_set( $output, $path, $value );
				}
			}
		}
	}

	/**
	 * Returns the raw data.
	 *
	 * @since 5.8.0
	 *
	 * @return array Raw data.
	 */
	public function get_raw_data() {
		return $this->theme_json;
	}

	/**
	 * Transforms the given editor settings according the
	 * add_theme_support format to the theme.json format.
	 *
	 * @since 5.8.0
	 *
	 * @param array $settings Existing editor settings.
	 * @return array Config that adheres to the theme.json schema.
	 */
	public static function get_from_editor_settings( $settings ) {
		$theme_settings = array(
			'version'  => static::LATEST_SCHEMA,
			'settings' => array(),
		);

		// Deprecated theme supports.
		if ( isset( $settings['disableCustomColors'] ) ) {
			if ( ! isset( $theme_settings['settings']['color'] ) ) {
				$theme_settings['settings']['color'] = array();
			}
			$theme_settings['settings']['color']['custom'] = ! $settings['disableCustomColors'];
		}

		if ( isset( $settings['disableCustomGradients'] ) ) {
			if ( ! isset( $theme_settings['settings']['color'] ) ) {
				$theme_settings['settings']['color'] = array();
			}
			$theme_settings['settings']['color']['customGradient'] = ! $settings['disableCustomGradients'];
		}

		if ( isset( $settings['disableCustomFontSizes'] ) ) {
			if ( ! isset( $theme_settings['settings']['typography'] ) ) {
				$theme_settings['settings']['typography'] = array();
			}
			$theme_settings['settings']['typography']['customFontSize'] = ! $settings['disableCustomFontSizes'];
		}

		if ( isset( $settings['enableCustomLineHeight'] ) ) {
			if ( ! isset( $theme_settings['settings']['typography'] ) ) {
				$theme_settings['settings']['typography'] = array();
			}
			$theme_settings['settings']['typography']['lineHeight'] = $settings['enableCustomLineHeight'];
		}

		if ( isset( $settings['enableCustomUnits'] ) ) {
			if ( ! isset( $theme_settings['settings']['spacing'] ) ) {
				$theme_settings['settings']['spacing'] = array();
			}
			$theme_settings['settings']['spacing']['units'] = ( true === $settings['enableCustomUnits'] ) ?
				array( 'px', 'em', 'rem', 'vh', 'vw', '%' ) :
				$settings['enableCustomUnits'];
		}

		if ( isset( $settings['colors'] ) ) {
			if ( ! isset( $theme_settings['settings']['color'] ) ) {
				$theme_settings['settings']['color'] = array();
			}
			$theme_settings['settings']['color']['palette'] = $settings['colors'];
		}

		if ( isset( $settings['gradients'] ) ) {
			if ( ! isset( $theme_settings['settings']['color'] ) ) {
				$theme_settings['settings']['color'] = array();
			}
			$theme_settings['settings']['color']['gradients'] = $settings['gradients'];
		}

		if ( isset( $settings['fontSizes'] ) ) {
			$font_sizes = $settings['fontSizes'];
			// Back-compatibility for presets without units.
			foreach ( $font_sizes as $key => $font_size ) {
				if ( is_numeric( $font_size['size'] ) ) {
					$font_sizes[ $key ]['size'] = $font_size['size'] . 'px';
				}
			}
			if ( ! isset( $theme_settings['settings']['typography'] ) ) {
				$theme_settings['settings']['typography'] = array();
			}
			$theme_settings['settings']['typography']['fontSizes'] = $font_sizes;
		}

		if ( isset( $settings['enableCustomSpacing'] ) ) {
			if ( ! isset( $theme_settings['settings']['spacing'] ) ) {
				$theme_settings['settings']['spacing'] = array();
			}
			$theme_settings['settings']['spacing']['padding'] = $settings['enableCustomSpacing'];
		}

		return $theme_settings;
	}

	/**
	 * Returns the current theme's wanted patterns(slugs) to be
	 * registered from Pattern Directory.
	 *
	 * @since 6.0.0
	 *
	 * @return string[]
	 */
	public function get_patterns() {
		if ( isset( $this->theme_json['patterns'] ) && is_array( $this->theme_json['patterns'] ) ) {
			return $this->theme_json['patterns'];
		}
		return array();
	}

	/**
	 * Returns a valid theme.json as provided by a theme.
	 *
	 * Unlike get_raw_data() this returns the presets flattened, as provided by a theme.
	 * This also uses appearanceTools instead of their opt-ins if all of them are true.
	 *
	 * @since 6.0.0
	 *
	 * @return array
	 */
	public function get_data() {
		$output = $this->theme_json;
		$nodes  = static::get_setting_nodes( $output );

		/**
		 * Flatten the theme & custom origins into a single one.
		 *
		 * For example, the following:
		 *
		 * {
		 *   "settings": {
		 *     "color": {
		 *       "palette": {
		 *         "theme": [ {} ],
		 *         "custom": [ {} ]
		 *       }
		 *     }
		 *   }
		 * }
		 *
		 * will be converted to:
		 *
		 * {
		 *   "settings": {
		 *     "color": {
		 *       "palette": [ {} ]
		 *     }
		 *   }
		 * }
		 */
		foreach ( $nodes as $node ) {
			foreach ( static::PRESETS_METADATA as $preset_metadata ) {
				$path = $node['path'];
				foreach ( $preset_metadata['path'] as $preset_metadata_path ) {
					$path[] = $preset_metadata_path;
				}
				$preset = _wp_array_get( $output, $path, null );
				if ( null === $preset ) {
					continue;
				}

				$items = array();
				if ( isset( $preset['theme'] ) ) {
					foreach ( $preset['theme'] as $item ) {
						$slug = $item['slug'];
						unset( $item['slug'] );
						$items[ $slug ] = $item;
					}
				}
				if ( isset( $preset['custom'] ) ) {
					foreach ( $preset['custom'] as $item ) {
						$slug = $item['slug'];
						unset( $item['slug'] );
						$items[ $slug ] = $item;
					}
				}
				$flattened_preset = array();
				foreach ( $items as $slug => $value ) {
					$flattened_preset[] = array_merge( array( 'slug' => (string) $slug ), $value );
				}
				_wp_array_set( $output, $path, $flattened_preset );
			}
		}

		/*
		 * If all of the static::APPEARANCE_TOOLS_OPT_INS are true,
		 * this code unsets them and sets 'appearanceTools' instead.
		 */
		foreach ( $nodes as $node ) {
			$all_opt_ins_are_set = true;
			foreach ( static::APPEARANCE_TOOLS_OPT_INS as $opt_in_path ) {
				$full_path = $node['path'];
				foreach ( $opt_in_path as $opt_in_path_item ) {
					$full_path[] = $opt_in_path_item;
				}
				/*
				 * Use "unset prop" as a marker instead of "null" because
				 * "null" can be a valid value for some props (e.g. blockGap).
				 */
				$opt_in_value = _wp_array_get( $output, $full_path, 'unset prop' );
				if ( 'unset prop' === $opt_in_value ) {
					$all_opt_ins_are_set = false;
					break;
				}
			}

			if ( $all_opt_ins_are_set ) {
				$node_path_with_appearance_tools   = $node['path'];
				$node_path_with_appearance_tools[] = 'appearanceTools';
				_wp_array_set( $output, $node_path_with_appearance_tools, true );
				foreach ( static::APPEARANCE_TOOLS_OPT_INS as $opt_in_path ) {
					$full_path = $node['path'];
					foreach ( $opt_in_path as $opt_in_path_item ) {
						$full_path[] = $opt_in_path_item;
					}
					/*
					 * Use "unset prop" as a marker instead of "null" because
					 * "null" can be a valid value for some props (e.g. blockGap).
					 */
					$opt_in_value = _wp_array_get( $output, $full_path, 'unset prop' );
					if ( true !== $opt_in_value ) {
						continue;
					}

					/*
					 * The following could be improved to be path independent.
					 * At the moment it relies on a couple of assumptions:
					 *
					 * - all opt-ins having a path of size 2.
					 * - there's two sources of settings: the top-level and the block-level.
					 */
					if (
						( 1 === count( $node['path'] ) ) &&
						( 'settings' === $node['path'][0] )
					) {
						// Top-level settings.
						unset( $output['settings'][ $opt_in_path[0] ][ $opt_in_path[1] ] );
						if ( empty( $output['settings'][ $opt_in_path[0] ] ) ) {
							unset( $output['settings'][ $opt_in_path[0] ] );
						}
					} elseif (
						( 3 === count( $node['path'] ) ) &&
						( 'settings' === $node['path'][0] ) &&
						( 'blocks' === $node['path'][1] )
					) {
						// Block-level settings.
						$block_name = $node['path'][2];
						unset( $output['settings']['blocks'][ $block_name ][ $opt_in_path[0] ][ $opt_in_path[1] ] );
						if ( empty( $output['settings']['blocks'][ $block_name ][ $opt_in_path[0] ] ) ) {
							unset( $output['settings']['blocks'][ $block_name ][ $opt_in_path[0] ] );
						}
					}
				}
			}
		}

		wp_recursive_ksort( $output );

		return $output;
	}

	/**
	 * Sets the spacingSizes array based on the spacingScale values from theme.json.
	 *
	 * @since 6.1.0
	 *
	 * @return null|void
	 */
	public function set_spacing_sizes() {
		$spacing_scale = isset( $this->theme_json['settings']['spacing']['spacingScale'] )
			? $this->theme_json['settings']['spacing']['spacingScale']
			: array();

		if ( ! isset( $spacing_scale['steps'] )
			|| ! is_numeric( $spacing_scale['steps'] )
			|| ! isset( $spacing_scale['mediumStep'] )
			|| ! isset( $spacing_scale['unit'] )
			|| ! isset( $spacing_scale['operator'] )
			|| ! isset( $spacing_scale['increment'] )
			|| ! isset( $spacing_scale['steps'] )
			|| ! is_numeric( $spacing_scale['increment'] )
			|| ! is_numeric( $spacing_scale['mediumStep'] )
			|| ( '+' !== $spacing_scale['operator'] && '*' !== $spacing_scale['operator'] ) ) {
			if ( ! empty( $spacing_scale ) ) {
				trigger_error( __( 'Some of the theme.json settings.spacing.spacingScale values are invalid' ), E_USER_NOTICE );
			}
			return null;
		}

		// If theme authors want to prevent the generation of the core spacing scale they can set their theme.json spacingScale.steps to 0.
		if ( 0 === $spacing_scale['steps'] ) {
			return null;
		}

		$unit            = '%' === $spacing_scale['unit'] ? '%' : sanitize_title( $spacing_scale['unit'] );
		$current_step    = $spacing_scale['mediumStep'];
		$steps_mid_point = round( $spacing_scale['steps'] / 2, 0 );
		$x_small_count   = null;
		$below_sizes     = array();
		$slug            = 40;
		$remainder       = 0;

		for ( $below_midpoint_count = $steps_mid_point - 1; $spacing_scale['steps'] > 1 && $slug > 0 && $below_midpoint_count > 0; $below_midpoint_count-- ) {
			if ( '+' === $spacing_scale['operator'] ) {
				$current_step -= $spacing_scale['increment'];
			} elseif ( $spacing_scale['increment'] > 1 ) {
				$current_step /= $spacing_scale['increment'];
			} else {
				$current_step *= $spacing_scale['increment'];
			}

			if ( $current_step <= 0 ) {
				$remainder = $below_midpoint_count;
				break;
			}

			$below_sizes[] = array(
				/* translators: %s: Digit to indicate multiple of sizing, eg. 2X-Small. */
				'name' => $below_midpoint_count === $steps_mid_point - 1 ? __( 'Small' ) : sprintf( __( '%sX-Small' ), (string) $x_small_count ),
				'slug' => (string) $slug,
				'size' => round( $current_step, 2 ) . $unit,
			);

			if ( $below_midpoint_count === $steps_mid_point - 2 ) {
				$x_small_count = 2;
			}

			if ( $below_midpoint_count < $steps_mid_point - 2 ) {
				++$x_small_count;
			}

			$slug -= 10;
		}

		$below_sizes = array_reverse( $below_sizes );

		$below_sizes[] = array(
			'name' => __( 'Medium' ),
			'slug' => '50',
			'size' => $spacing_scale['mediumStep'] . $unit,
		);

		$current_step  = $spacing_scale['mediumStep'];
		$x_large_count = null;
		$above_sizes   = array();
		$slug          = 60;
		$steps_above   = ( $spacing_scale['steps'] - $steps_mid_point ) + $remainder;

		for ( $above_midpoint_count = 0; $above_midpoint_count < $steps_above; $above_midpoint_count++ ) {
			$current_step = '+' === $spacing_scale['operator']
				? $current_step + $spacing_scale['increment']
				: ( $spacing_scale['increment'] >= 1 ? $current_step * $spacing_scale['increment'] : $current_step / $spacing_scale['increment'] );

			$above_sizes[] = array(
				/* translators: %s: Digit to indicate multiple of sizing, eg. 2X-Large. */
				'name' => 0 === $above_midpoint_count ? __( 'Large' ) : sprintf( __( '%sX-Large' ), (string) $x_large_count ),
				'slug' => (string) $slug,
				'size' => round( $current_step, 2 ) . $unit,
			);

			if ( 1 === $above_midpoint_count ) {
				$x_large_count = 2;
			}

			if ( $above_midpoint_count > 1 ) {
				++$x_large_count;
			}

			$slug += 10;
		}

		$spacing_sizes = $below_sizes;
		foreach ( $above_sizes as $above_sizes_item ) {
			$spacing_sizes[] = $above_sizes_item;
		}

		// If there are 7 or fewer steps in the scale revert to numbers for labels instead of t-shirt sizes.
		if ( $spacing_scale['steps'] <= 7 ) {
			for ( $spacing_sizes_count = 0; $spacing_sizes_count < count( $spacing_sizes ); $spacing_sizes_count++ ) {
				$spacing_sizes[ $spacing_sizes_count ]['name'] = (string) ( $spacing_sizes_count + 1 );
			}
		}

		_wp_array_set( $this->theme_json, array( 'settings', 'spacing', 'spacingSizes', 'default' ), $spacing_sizes );
	}

	/**
	 * This is used to convert the internal representation of variables to the CSS representation.
	 * For example, `var:preset|color|vivid-green-cyan` becomes `var(--wp--preset--color--vivid-green-cyan)`.
	 *
	 * @since 6.3.0
	 * @param string $value The variable such as var:preset|color|vivid-green-cyan to convert.
	 * @return string The converted variable.
	 */
	private static function convert_custom_properties( $value ) {
		$prefix     = 'var:';
		$prefix_len = strlen( $prefix );
		$token_in   = '|';
		$token_out  = '--';
		if ( str_starts_with( $value, $prefix ) ) {
			$unwrapped_name = str_replace(
				$token_in,
				$token_out,
				substr( $value, $prefix_len )
			);
			$value          = "var(--wp--$unwrapped_name)";
		}

		return $value;
	}

	/**
	 * Given a tree, converts the internal representation of variables to the CSS representation.
	 * It is recursive and modifies the input in-place.
	 *
	 * @since 6.3.0
	 * @param array $tree   Input to process.
	 * @return array The modified $tree.
	 */
	private static function resolve_custom_css_format( $tree ) {
		$prefix = 'var:';

		foreach ( $tree as $key => $data ) {
			if ( is_string( $data ) && str_starts_with( $data, $prefix ) ) {
				$tree[ $key ] = self::convert_custom_properties( $data );
			} elseif ( is_array( $data ) ) {
				$tree[ $key ] = self::resolve_custom_css_format( $data );
			}
		}

		return $tree;
	}

	/**
	 * Returns the selectors metadata for a block.
	 *
	 * @since 6.3.0
	 *
	 * @param object $block_type    The block type.
	 * @param string $root_selector The block's root selector.
	 *
	 * @return array The custom selectors set by the block.
	 */
	protected static function get_block_selectors( $block_type, $root_selector ) {
		if ( ! empty( $block_type->selectors ) ) {
			return $block_type->selectors;
		}

		$selectors = array( 'root' => $root_selector );
		foreach ( static::BLOCK_SUPPORT_FEATURE_LEVEL_SELECTORS as $key => $feature ) {
			$feature_selector = wp_get_block_css_selector( $block_type, $key );
			if ( null !== $feature_selector ) {
				$selectors[ $feature ] = array( 'root' => $feature_selector );
			}
		}

		return $selectors;
	}

	/**
	 * Generates all the element selectors for a block.
	 *
	 * @since 6.3.0
	 *
	 * @param string $root_selector The block's root CSS selector.
	 * @return array The block's element selectors.
	 */
	protected static function get_block_element_selectors( $root_selector ) {
		/*
		 * Assign defaults, then override those that the block sets by itself.
		 * If the block selector is compounded, will append the element to each
		 * individual block selector.
		 */
		$block_selectors   = explode( ',', $root_selector );
		$element_selectors = array();
		foreach ( static::ELEMENTS as $el_name => $el_selector ) {
			$element_selector = array();
			foreach ( $block_selectors as $selector ) {
				if ( $selector === $el_selector ) {
					$element_selector = array( $el_selector );
					break;
				}
				$element_selector[] = static::prepend_to_selector( $el_selector, $selector . ' ' );
			}
			$element_selectors[ $el_name ] = implode( ',', $element_selector );
		}

		return $element_selectors;
	}

	/**
	 * Generates style declarations for a node's features e.g., color, border,
	 * typography etc. that have custom selectors in their related block's
	 * metadata.
	 *
	 * @since 6.3.0
	 *
	 * @param object $metadata The related block metadata containing selectors.
	 * @param object $node     A merged theme.json node for block or variation.
	 *
	 * @return array The style declarations for the node's features with custom
	 * selectors.
	 */
	protected function get_feature_declarations_for_node( $metadata, &$node ) {
		$declarations = array();

		if ( ! isset( $metadata['selectors'] ) ) {
			return $declarations;
		}

		$settings = isset( $this->theme_json['settings'] )
			? $this->theme_json['settings']
			: array();

		foreach ( $metadata['selectors'] as $feature => $feature_selectors ) {
			/*
			 * Skip if this is the block's root selector or the block doesn't
			 * have any styles for the feature.
			 */
			if ( 'root' === $feature || empty( $node[ $feature ] ) ) {
				continue;
			}

			if ( is_array( $feature_selectors ) ) {
				foreach ( $feature_selectors as $subfeature => $subfeature_selector ) {
					if ( 'root' === $subfeature || empty( $node[ $feature ][ $subfeature ] ) ) {
						continue;
					}

					/*
					 * Create temporary node containing only the subfeature data
					 * to leverage existing `compute_style_properties` function.
					 */
					$subfeature_node = array(
						$feature => array(
							$subfeature => $node[ $feature ][ $subfeature ],
						),
					);

					// Generate style declarations.
					$new_declarations = static::compute_style_properties( $subfeature_node, $settings, null, $this->theme_json );

					// Merge subfeature declarations into feature declarations.
					if ( isset( $declarations[ $subfeature_selector ] ) ) {
						foreach ( $new_declarations as $new_declaration ) {
							$declarations[ $subfeature_selector ][] = $new_declaration;
						}
					} else {
						$declarations[ $subfeature_selector ] = $new_declarations;
					}

					/*
					 * Remove the subfeature from the block's node now its
					 * styles will be included under its own selector not the
					 * block's.
					 */
					unset( $node[ $feature ][ $subfeature ] );
				}
			}

			/*
			 * Now subfeatures have been processed and removed we can process
			 * feature root selector or simple string selector.
			 */
			if (
				is_string( $feature_selectors ) ||
				( isset( $feature_selectors['root'] ) && $feature_selectors['root'] )
			) {
				$feature_selector = is_string( $feature_selectors ) ? $feature_selectors : $feature_selectors['root'];

				/*
				 * Create temporary node containing only the feature data
				 * to leverage existing `compute_style_properties` function.
				 */
				$feature_node = array( $feature => $node[ $feature ] );

				// Generate the style declarations.
				$new_declarations = static::compute_style_properties( $feature_node, $settings, null, $this->theme_json );

				/*
				 * Merge new declarations with any that already exist for
				 * the feature selector. This may occur when multiple block
				 * support features use the same custom selector.
				 */
				if ( isset( $declarations[ $feature_selector ] ) ) {
					foreach ( $new_declarations as $new_declaration ) {
						$declarations[ $feature_selector ][] = $new_declaration;
					}
				} else {
					$declarations[ $feature_selector ] = $new_declarations;
				}

				/*
				 * Remove the feature from the block's node now its styles
				 * will be included under its own selector not the block's.
				 */
				unset( $node[ $feature ] );
			}
		}

		return $declarations;
	}

	/**
	 * Replaces CSS variables with their values in place.
	 *
	 * @since 6.3.0
	 * @param array $styles CSS declarations to convert.
	 * @param array $values key => value pairs to use for replacement.
	 * @return array
	 */
	private static function convert_variables_to_value( $styles, $values ) {
		foreach ( $styles as $key => $style ) {
			if ( is_array( $style ) ) {
				$styles[ $key ] = self::convert_variables_to_value( $style, $values );
				continue;
			}

			if ( 0 <= strpos( $style, 'var(' ) ) {
				// find all the variables in the string in the form of var(--variable-name, fallback), with fallback in the second capture group.

				$has_matches = preg_match_all( '/var\(([^),]+)?,?\s?(\S+)?\)/', $style, $var_parts );

				if ( $has_matches ) {
					$resolved_style = $styles[ $key ];
					foreach ( $var_parts[1] as $index => $var_part ) {
						$key_in_values   = 'var(' . $var_part . ')';
						$rule_to_replace = $var_parts[0][ $index ]; // the css rule to replace e.g. var(--wp--preset--color--vivid-green-cyan).
						$fallback        = $var_parts[2][ $index ]; // the fallback value.
						$resolved_style  = str_replace(
							array(
								$rule_to_replace,
								$fallback,
							),
							array(
								isset( $values[ $key_in_values ] ) ? $values[ $key_in_values ] : $rule_to_replace,
								isset( $values[ $fallback ] ) ? $values[ $fallback ] : $fallback,
							),
							$resolved_style
						);
					}
					$styles[ $key ] = $resolved_style;
				}
			}
		}

		return $styles;
	}

	/**
	 * Resolves the values of CSS variables in the given styles.
	 *
	 * @since 6.3.0
	 * @param WP_Theme_JSON $theme_json The theme json resolver.
	 *
	 * @return WP_Theme_JSON The $theme_json with resolved variables.
	 */
	public static function resolve_variables( $theme_json ) {
		$settings    = $theme_json->get_settings();
		$styles      = $theme_json->get_raw_data()['styles'];
		$preset_vars = static::compute_preset_vars( $settings, static::VALID_ORIGINS );
		$theme_vars  = static::compute_theme_vars( $settings );
		$vars        = array_reduce(
			array_merge( $preset_vars, $theme_vars ),
			function ( $carry, $item ) {
				$name                    = $item['name'];
				$carry[ "var({$name})" ] = $item['value'];
				return $carry;
			},
			array()
		);

		$theme_json->theme_json['styles'] = self::convert_variables_to_value( $styles, $vars );
		return $theme_json;
	}
}