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;
				}
			}

			// Processes background styles.
			if ( 'background' === $value_path[0] && isset( $styles['background'] ) ) {
				$background_styles = wp_style_engine_get_styles( array( 'background' => $styles['background'] ) );
				$value             = isset( $background_styles['declarations'][ $css_property ] ) ? $background_styles['declarations'][ $css_property ] : $value;
			}

			// 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.
				 * Pass the current theme_json settings to override any global settings.
				 */
				$value = wp_get_typography_font_size_value( array( 'size' => $value ), $settings );
			}

			if ( 'aspect-ratio' === $css_property ) {
				// For aspect ratio to work, other dimensions rules must be unset.
				// This ensures that a fixed height does not override the aspect ratio.
				$declarations[] = array(
					'name'  => 'min-height',
					'value' => 'unset',
				);
			}

			$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_CSS_PROPERTIES_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
	 * @since 6.6.0 Added options array for modifying generated nodes.
	 *
	 * @param array $theme_json The tree to extract style nodes from.
	 * @param array $selectors  List of selectors per block.
	 * @param array $options {
	 *     Optional. An array of options for now used for internal purposes only (may change without notice).
	 *
	 *     @type bool $include_block_style_variations Includes style nodes for block style variations. Default false.
	 * }
	 * @return array An array of style nodes metadata.
	 */
	protected static function get_style_nodes( $theme_json, $selectors = array(), $options = 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, $selectors, $options );
		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.
	 * @since 6.6.0 Added optional selectors and options for generating block nodes.
	 *
	 * @param array $theme_json The theme.json converted to an array.
	 * @param array $selectors  Optional list of selectors per block.
	 * @param array $options {
	 *     Optional. An array of options for now used for internal purposes only (may change without notice).
	 *
	 *     @type bool   $include_block_style_variations  Includes nodes for block style variations. Default false.
	 * }
	 * @return array The block nodes in theme.json.
	 */
	private static function get_block_nodes( $theme_json, $selectors = array(), $options = array() ) {
		$selectors = empty( $selectors ) ? static::get_blocks_metadata() : $selectors;
		$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();
			$include_variations  = $options['include_block_style_variations'] ?? false;
			if ( $include_variations && 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
	 * @since 6.6.0 Setting a min-height of HTML when root styles have a background gradient or image.
	 *              Updated general global styles specificity to 0-1-0.
	 *              Fixed custom CSS output in block style variations.
	 *
	 * @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 );
		$is_root_selector     = static::ROOT_BLOCK_SELECTOR === $selector;

		// If there are style variations, generate the declarations for them, including any feature selectors the block may have.
		$style_variation_declarations = array();
		$style_variation_custom_css   = 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 );
				// Store custom CSS for the style variation.
				if ( isset( $style_variation_node['css'] ) ) {
					$style_variation_custom_css[ $style_variation['selector'] ] = $this->process_blocks_custom_css( $style_variation_node['css'], $style_variation['selector'] );
				}
			}
		}
		/*
		 * 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. Bespoke declaration modifiers:
		 * - 'filter': Separate the declarations that use the general selector
		 * from the ones using the duotone selector.
		 * - 'background|background-image': set the html min-height to 100%
		 * to ensure the background covers the entire viewport.
		 */
		$declarations_duotone       = array();
		$should_set_root_min_height = false;

		foreach ( $declarations as $index => $declaration ) {
			if ( 'filter' === $declaration['name'] ) {
				/*
				 * 'unset' filters happen when a filter is unset
				 * in the site-editor UI. Because the 'unset' value
				 * in the user origin overrides the value in the
				 * theme origin, we can skip rendering anything
				 * here as no filter needs to be applied anymore.
				 * So only add declarations to with values other
				 * than 'unset'.
				 */
				if ( 'unset' !== $declaration['value'] ) {
					$declarations_duotone[] = $declaration;
				}
				unset( $declarations[ $index ] );
			}

			if ( $is_root_selector && ( 'background-image' === $declaration['name'] || 'background' === $declaration['name'] ) ) {
				$should_set_root_min_height = true;
			}
		}

		/*
		 * If root styles has a background-image or a background (gradient) set,
		 * set the min-height to '100%'. Minus `--wp-admin--admin-bar--height` for logged-in view.
		 * Setting the CSS rule on the HTML tag ensures background gradients and images behave similarly,
		 * and matches the behavior of the site editor.
		 */
		if ( $should_set_root_min_height ) {
			$block_rules .= static::to_ruleset(
				'html',
				array(
					array(
						'name'  => 'min-height',
						'value' => 'calc(100% - var(--wp-admin--admin-bar--height, 0px))',
					),
				)
			);
		}

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

		/*
		 * Top-level element styles using element-only specificity selectors should
		 * not get wrapped in `:root :where()` to maintain backwards compatibility.
		 *
		 * Pseudo classes, e.g. :hover, :focus etc., are a class-level selector so
		 * still need to be wrapped in `:root :where` to cap specificity for nested
		 * variations etc. Pseudo selectors won't match the ELEMENTS selector exactly.
		 */
		$element_only_selector = $current_element &&
			isset( static::ELEMENTS[ $current_element ] ) &&
			// buttons, captions etc. still need `:root :where()` as they are class based selectors.
			! isset( static::__EXPERIMENTAL_ELEMENT_CLASS_NAMES[ $current_element ] ) &&
			static::ELEMENTS[ $current_element ] === $selector;

		// 2. Generate and append the rules that use the general selector.
		$general_selector = $element_only_selector ? $selector : ":root :where($selector)";
		$block_rules     .= static::to_ruleset( $general_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 (
			! $is_root_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 ) {
			$block_rules .= static::to_ruleset( ":root :where($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 ) {
			$block_rules .= static::to_ruleset( ":root :where($style_variation_selector)", $individual_style_variation_declarations );
			if ( isset( $style_variation_custom_css[ $style_variation_selector ] ) ) {
				$block_rules .= $style_variation_custom_css[ $style_variation_selector ];
			}
		}

		// 7. Generate and append any custom CSS rules pertaining to nested block style variations.
		if ( isset( $node['css'] ) && ! $is_root_selector ) {
			$block_rules .= $this->process_blocks_custom_css( $node['css'], $selector );
		}

		return $block_rules;
	}

	/**
	 * Outputs the CSS for layout rules on the root.
	 *
	 * @since 6.1.0
	 * @since 6.6.0 Use `ROOT_CSS_PROPERTIES_SELECTOR` for CSS custom properties and improved consistency of root padding rules.
	 *              Updated specificity of body margin reset and first/last child selectors.
	 *
	 * @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'];

		/*
		* 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         .= static::ROOT_CSS_PROPERTIES_SELECTOR . ' { --wp--style--global--content-size: ' . $content_size . ';';
			$css         .= '--wp--style--global--wide-size: ' . $wide_size . '; }';
		}

		/*
		* Reset default browser margin on the body element.
		* This is set on the body 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 .= ':where(body) { margin: 0; }';

		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); }';
			// 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); }';
			// Nested children of the container with left and right padding that are not full aligned do not get padding, unless they are direct children of an alignfull flow container.
			$css .= '.has-global-padding :where(:not(.alignfull.is-layout-flow) > .has-global-padding:not(.wp-block-block, .alignfull)) { padding-right: 0; padding-left: 0; }';
			// Alignfull direct children of the containers that are targeted by the rule above do not need negative margins.
			$css .= '.has-global-padding :where(:not(.alignfull.is-layout-flow) > .has-global-padding:not(.wp-block-block, .alignfull)) > .alignfull { margin-left: 0; margin-right: 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 styles will be output unless explicitly set to `null`. See static::PROTECTED_PROPERTIES.
		if ( isset( $this->theme_json['settings']['spacing']['blockGap'] ) ) {
			$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 { margin-block-start: 0; }';
			$css            .= ':where(.wp-site-blocks) > :last-child { margin-block-end: 0; }';

			// For backwards compatibility, ensure the legacy block gap CSS variable is still available.
			$css .= static::ROOT_CSS_PROPERTIES_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 );

		/*
		 * Recompute all the spacing sizes based on the new hierarchy of data. In the constructor
		 * spacingScale and spacingSizes are both keyed by origin and VALID_ORIGINS is ordered, so
		 * we can allow partial spacingScale data to inherit missing data from earlier layers when
		 * computing the spacing sizes.
		 *
		 * This happens before the presets are merged to ensure that default spacing sizes can be
		 * removed from the theme origin if $prevent_override is true.
		 */
		$flattened_spacing_scale = array();
		foreach ( static::VALID_ORIGINS as $origin ) {
			$scale_path = array( 'settings', 'spacing', 'spacingScale', $origin );

			// Apply the base spacing scale to the current layer.
			$base_spacing_scale      = _wp_array_get( $this->theme_json, $scale_path, array() );
			$flattened_spacing_scale = array_replace( $flattened_spacing_scale, $base_spacing_scale );

			$spacing_scale = _wp_array_get( $incoming_data, $scale_path, null );
			if ( ! isset( $spacing_scale ) ) {
				continue;
			}

			// Allow partial scale settings by merging with lower layers.
			$flattened_spacing_scale = array_replace( $flattened_spacing_scale, $spacing_scale );

			// Generate and merge the scales for this layer.
			$sizes_path           = array( 'settings', 'spacing', 'spacingSizes', $origin );
			$spacing_sizes        = _wp_array_get( $incoming_data, $sizes_path, array() );
			$spacing_scale_sizes  = static::compute_spacing_sizes( $flattened_spacing_scale );
			$merged_spacing_sizes = static::merge_spacing_sizes( $spacing_scale_sizes, $spacing_sizes );

			_wp_array_set( $incoming_data, $sizes_path, $merged_spacing_sizes );
		}

		/*
		 * 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_metadata ) {
				$prevent_override = $preset_metadata['prevent_override'];
				if ( is_array( $prevent_override ) ) {
					$prevent_override = _wp_array_get( $this->theme_json['settings'], $preset_metadata['prevent_override'] );
				}

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

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

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

					// Set names for theme presets based on the slug if they are not set and can use default names.
					if ( 'theme' === $origin && $preset_metadata['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;
								}
							}
						}
					}

					// Filter out default slugs from theme presets when defaults should not be overridden.
					if ( 'theme' === $origin && $prevent_override ) {
						$slugs_node    = static::get_default_slugs( $this->theme_json, $node['path'] );
						$preset_global = _wp_array_get( $slugs_global, $preset_metadata['path'], array() );
						$preset_node   = _wp_array_get( $slugs_node, $preset_metadata['path'], array() );
						$preset_slugs  = array_merge_recursive( $preset_global, $preset_node );

						$content = static::filter_slugs( $content, $preset_slugs );
					}

					_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 leaves 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.
	 * @since 6.6.0 Updated to allow variation element styles and $origin parameter.
	 *
	 * @param array  $theme_json Structure to sanitize.
	 * @param string $origin    Optional. What source of data this object represents.
	 *                          One of 'blocks', 'default', 'theme', or 'custom'. Default 'theme'.
	 * @return array Sanitized structure.
	 */
	public static function remove_insecure_properties( $theme_json, $origin = 'theme' ) {
		if ( ! in_array( $origin, static::VALID_ORIGINS, true ) ) {
			$origin = 'theme';
		}

		$sanitized = array();

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

		$valid_block_names   = array_keys( static::get_blocks_metadata() );
		$valid_element_names = array_keys( static::ELEMENTS );
		$valid_variations    = static::get_valid_block_style_variations();

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

		$blocks_metadata = static::get_blocks_metadata();
		$style_options   = array( 'include_block_style_variations' => true ); // Allow variations data.
		$style_nodes     = static::get_style_nodes( $theme_json, $blocks_metadata, $style_options );

		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 );

					// Process a variation's elements and element pseudo selector styles.
					if ( isset( $variation_input['elements'] ) ) {
						foreach ( $valid_element_names as $element_name ) {
							$element_input = $variation_input['elements'][ $element_name ] ?? null;
							if ( $element_input ) {
								$element_output = static::remove_insecure_styles( $element_input );

								if ( isset( static::VALID_ELEMENT_PSEUDO_SELECTORS[ $element_name ] ) ) {
									foreach ( static::VALID_ELEMENT_PSEUDO_SELECTORS[ $element_name ] as $pseudo_selector ) {
										if ( isset( $element_input[ $pseudo_selector ] ) ) {
											$element_output[ $pseudo_selector ] = static::remove_insecure_styles( $element_input[ $pseudo_selector ] );
										}
									}
								}

								if ( ! empty( $element_output ) ) {
									_wp_array_set( $variation_output, array( 'elements', $element_name ), $element_output );
								}
							}
						}
					}

					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'] ) ) {
			$theme_settings['settings']['color']['custom'] = ! $settings['disableCustomColors'];
		}

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

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

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

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

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

		if ( isset( $settings['gradients'] ) ) {
			$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';
				}
			}
			$theme_settings['settings']['typography']['fontSizes'] = $font_sizes;
		}

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

		if ( isset( $settings['spacingSizes'] ) ) {
			$theme_settings['settings']['spacing']['spacingSizes'] = $settings['spacingSizes'];
		}

		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
	 * @deprecated 6.6.0 No longer used as the spacingSizes are automatically
	 *                   generated in the constructor and merge methods instead
	 *                   of manually after instantiation.
	 *
	 * @return null|void
	 */
	public function set_spacing_sizes() {
		_deprecated_function( __METHOD__, '6.6.0' );

		$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( $spacing_scale ) ) {
				wp_trigger_error(
					__METHOD__,
					sprintf(
						/* translators: 1: theme.json, 2: settings.spacing.spacingScale */
						__( 'Some of the %1$s %2$s values are invalid' ),
						'theme.json',
						'settings.spacing.spacingScale'
					),
					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;
		}

		$spacing_sizes = static::compute_spacing_sizes( $spacing_scale );

		// 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 );
	}

	/**
	 * Merges two sets of spacing size presets.
	 *
	 * @since 6.6.0
	 *
	 * @param array $base     The base set of spacing sizes.
	 * @param array $incoming The set of spacing sizes to merge with the base. Duplicate slugs will override the base values.
	 * @return array The merged set of spacing sizes.
	 */
	private static function merge_spacing_sizes( $base, $incoming ) {
		// Preserve the order if there are no base (spacingScale) values.
		if ( empty( $base ) ) {
			return $incoming;
		}
		$merged = array();
		foreach ( $base as $item ) {
			$merged[ $item['slug'] ] = $item;
		}
		foreach ( $incoming as $item ) {
			$merged[ $item['slug'] ] = $item;
		}
		ksort( $merged, SORT_NUMERIC );
		return array_values( $merged );
	}

	/**
	 * Generates a set of spacing sizes by starting with a medium size and
	 * applying an operator with an increment value to generate the rest of the
	 * sizes outward from the medium size. The medium slug is '50' with the rest
	 * of the slugs being 10 apart. The generated names use t-shirt sizing.
	 *
	 * Example:
	 *
	 *     $spacing_scale = array(
	 *         'steps'      => 4,
	 *         'mediumStep' => 16,
	 *         'unit'       => 'px',
	 *         'operator'   => '+',
	 *         'increment'  => 2,
	 *     );
	 *     $spacing_sizes = static::compute_spacing_sizes( $spacing_scale );
	 *     // -> array(
	 *     //        array( 'name' => 'Small',   'slug' => '40', 'size' => '14px' ),
	 *     //        array( 'name' => 'Medium',  'slug' => '50', 'size' => '16px' ),
	 *     //        array( 'name' => 'Large',   'slug' => '60', 'size' => '18px' ),
	 *     //        array( 'name' => 'X-Large', 'slug' => '70', 'size' => '20px' ),
	 *     //    )
	 *
	 * @since 6.6.0
	 *
	 * @param array $spacing_scale {
	 *      The spacing scale values. All are required.
	 *
	 *      @type int    $steps      The number of steps in the scale. (up to 10 steps are supported.)
	 *      @type float  $mediumStep The middle value that gets the slug '50'. (For even number of steps, this becomes the first middle value.)
	 *      @type string $unit       The CSS unit to use for the sizes.
	 *      @type string $operator   The mathematical operator to apply to generate the other sizes. Either '+' or '*'.
	 *      @type float  $increment  The value used with the operator to generate the other sizes.
	 * }
	 * @return array The spacing sizes presets or an empty array if some spacing scale values are missing or invalid.
	 */
	private static function compute_spacing_sizes( $spacing_scale ) {
		/*
		 * This condition is intentionally missing some checks on ranges for the values in order to
		 * keep backwards compatibility with the previous implementation.
		 */
		if (
			! isset( $spacing_scale['steps'] ) ||
			! is_numeric( $spacing_scale['steps'] ) ||
			0 === $spacing_scale['steps'] ||
			! isset( $spacing_scale['mediumStep'] ) ||
			! is_numeric( $spacing_scale['mediumStep'] ) ||
			! isset( $spacing_scale['unit'] ) ||
			! isset( $spacing_scale['operator'] ) ||
			( '+' !== $spacing_scale['operator'] && '*' !== $spacing_scale['operator'] ) ||
			! isset( $spacing_scale['increment'] ) ||
			! is_numeric( $spacing_scale['increment'] )
		) {
			return array();
		}

		$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;
		}

		return $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
	 * @since 6.5.0 Check for empty style before processing its value.
	 *
	 * @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 ( empty( $style ) ) {
				continue;
			}

			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;
	}

	/**
	 * Generates a selector for a block style variation.
	 *
	 * @since 6.5.0
	 *
	 * @param string $variation_name Name of the block style variation.
	 * @param string $block_selector CSS selector for the block.
	 * @return string Block selector with block style variation selector added to it.
	 */
	protected static function get_block_style_variation_selector( $variation_name, $block_selector ) {
		$variation_class = ".is-style-$variation_name";

		if ( ! $block_selector ) {
			return $variation_class;
		}

		$limit          = 1;
		$selector_parts = explode( ',', $block_selector );
		$result         = array();

		foreach ( $selector_parts as $part ) {
			$result[] = preg_replace_callback(
				'/((?::\([^)]+\))?\s*)([^\s:]+)/',
				function ( $matches ) use ( $variation_class ) {
					return $matches[1] . $matches[2] . $variation_class;
				},
				$part,
				$limit
			);
		}

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

	/**
	 * Collects valid block style variations keyed by block type.
	 *
	 * @since 6.6.0
	 *
	 * @return array Valid block style variations by block type.
	 */
	protected static function get_valid_block_style_variations() {
		$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'] );
		}

		return $valid_variations;
	}
}
 * @param int    $comment_id      Comment ID.
		 */
		$message_headers = apply_filters( 'comment_moderation_headers', $message_headers, $comment_id );

		foreach ( $emails as $email ) {
			wp_mail( $email, wp_specialchars_decode( $subject ), $notify_message, $message_headers );
		}

		if ( $switched_locale ) {
			restore_previous_locale();
		}

		return true;
	}
endif;

if ( ! function_exists( 'wp_password_change_notification' ) ) :
	/**
	 * Notifies the blog admin of a user changing password, normally via email.
	 *
	 * @since 2.7.0
	 *
	 * @param WP_User $user User object.
	 */
	function wp_password_change_notification( $user ) {
		/*
		 * Send a copy of password change notification to the admin,
		 * but check to see if it's the admin whose password we're changing, and skip this.
		 */
		if ( 0 !== strcasecmp( $user->user_email, get_option( 'admin_email' ) ) ) {
			/* translators: %s: User name. */
			$message = sprintf( __( 'Password changed for user: %s' ), $user->user_login ) . "\r\n";
			/*
			 * The blogname option is escaped with esc_html() on the way into the database in sanitize_option().
			 * We want to reverse this for the plain text arena of emails.
			 */
			$blogname = wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES );

			$wp_password_change_notification_email = array(
				'to'      => get_option( 'admin_email' ),
				/* translators: Password change notification email subject. %s: Site title. */
				'subject' => __( '[%s] Password Changed' ),
				'message' => $message,
				'headers' => '',
			);

			/**
			 * Filters the contents of the password change notification email sent to the site admin.
			 *
			 * @since 4.9.0
			 *
			 * @param array   $wp_password_change_notification_email {
			 *     Used to build wp_mail().
			 *
			 *     @type string $to      The intended recipient - site admin email address.
			 *     @type string $subject The subject of the email.
			 *     @type string $message The body of the email.
			 *     @type string $headers The headers of the email.
			 * }
			 * @param WP_User $user     User object for user whose password was changed.
			 * @param string  $blogname The site title.
			 */
			$wp_password_change_notification_email = apply_filters( 'wp_password_change_notification_email', $wp_password_change_notification_email, $user, $blogname );

			wp_mail(
				$wp_password_change_notification_email['to'],
				wp_specialchars_decode( sprintf( $wp_password_change_notification_email['subject'], $blogname ) ),
				$wp_password_change_notification_email['message'],
				$wp_password_change_notification_email['headers']
			);
		}
	}
endif;

if ( ! function_exists( 'wp_new_user_notification' ) ) :
	/**
	 * Emails login credentials to a newly-registered user.
	 *
	 * A new user registration notification is also sent to admin email.
	 *
	 * @since 2.0.0
	 * @since 4.3.0 The `$plaintext_pass` parameter was changed to `$notify`.
	 * @since 4.3.1 The `$plaintext_pass` parameter was deprecated. `$notify` added as a third parameter.
	 * @since 4.6.0 The `$notify` parameter accepts 'user' for sending notification only to the user created.
	 *
	 * @param int    $user_id    User ID.
	 * @param null   $deprecated Not used (argument deprecated).
	 * @param string $notify     Optional. Type of notification that should happen. Accepts 'admin' or an empty
	 *                           string (admin only), 'user', or 'both' (admin and user). Default empty.
	 */
	function wp_new_user_notification( $user_id, $deprecated = null, $notify = '' ) {
		if ( null !== $deprecated ) {
			_deprecated_argument( __FUNCTION__, '4.3.1' );
		}

		// Accepts only 'user', 'admin' , 'both' or default '' as $notify.
		if ( ! in_array( $notify, array( 'user', 'admin', 'both', '' ), true ) ) {
			return;
		}

		$user = get_userdata( $user_id );

		/*
		 * The blogname option is escaped with esc_html() on the way into the database in sanitize_option().
		 * We want to reverse this for the plain text arena of emails.
		 */
		$blogname = wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES );

		/**
		 * Filters whether the admin is notified of a new user registration.
		 *
		 * @since 6.1.0
		 *
		 * @param bool    $send Whether to send the email. Default true.
		 * @param WP_User $user User object for new user.
		 */
		$send_notification_to_admin = apply_filters( 'wp_send_new_user_notification_to_admin', true, $user );

		if ( 'user' !== $notify && true === $send_notification_to_admin ) {
			$switched_locale = switch_to_locale( get_locale() );

			/* translators: %s: Site title. */
			$message = sprintf( __( 'New user registration on your site %s:' ), $blogname ) . "\r\n\r\n";
			/* translators: %s: User login. */
			$message .= sprintf( __( 'Username: %s' ), $user->user_login ) . "\r\n\r\n";
			/* translators: %s: User email address. */
			$message .= sprintf( __( 'Email: %s' ), $user->user_email ) . "\r\n";

			$wp_new_user_notification_email_admin = array(
				'to'      => get_option( 'admin_email' ),
				/* translators: New user registration notification email subject. %s: Site title. */
				'subject' => __( '[%s] New User Registration' ),
				'message' => $message,
				'headers' => '',
			);

			/**
			 * Filters the contents of the new user notification email sent to the site admin.
			 *
			 * @since 4.9.0
			 *
			 * @param array   $wp_new_user_notification_email_admin {
			 *     Used to build wp_mail().
			 *
			 *     @type string $to      The intended recipient - site admin email address.
			 *     @type string $subject The subject of the email.
			 *     @type string $message The body of the email.
			 *     @type string $headers The headers of the email.
			 * }
			 * @param WP_User $user     User object for new user.
			 * @param string  $blogname The site title.
			 */
			$wp_new_user_notification_email_admin = apply_filters( 'wp_new_user_notification_email_admin', $wp_new_user_notification_email_admin, $user, $blogname );

			wp_mail(
				$wp_new_user_notification_email_admin['to'],
				wp_specialchars_decode( sprintf( $wp_new_user_notification_email_admin['subject'], $blogname ) ),
				$wp_new_user_notification_email_admin['message'],
				$wp_new_user_notification_email_admin['headers']
			);

			if ( $switched_locale ) {
				restore_previous_locale();
			}
		}

		/**
		 * Filters whether the user is notified of their new user registration.
		 *
		 * @since 6.1.0
		 *
		 * @param bool    $send Whether to send the email. Default true.
		 * @param WP_User $user User object for new user.
		 */
		$send_notification_to_user = apply_filters( 'wp_send_new_user_notification_to_user', true, $user );

		// `$deprecated` was pre-4.3 `$plaintext_pass`. An empty `$plaintext_pass` didn't sent a user notification.
		if ( 'admin' === $notify || true !== $send_notification_to_user || ( empty( $deprecated ) && empty( $notify ) ) ) {
			return;
		}

		$key = get_password_reset_key( $user );
		if ( is_wp_error( $key ) ) {
			return;
		}

		$switched_locale = switch_to_user_locale( $user_id );

		/* translators: %s: User login. */
		$message  = sprintf( __( 'Username: %s' ), $user->user_login ) . "\r\n\r\n";
		$message .= __( 'To set your password, visit the following address:' ) . "\r\n\r\n";
		$message .= network_site_url( "wp-login.php?action=rp&key=$key&login=" . rawurlencode( $user->user_login ), 'login' ) . "\r\n\r\n";

		$message .= wp_login_url() . "\r\n";

		$wp_new_user_notification_email = array(
			'to'      => $user->user_email,
			/* translators: Login details notification email subject. %s: Site title. */
			'subject' => __( '[%s] Login Details' ),
			'message' => $message,
			'headers' => '',
		);

		/**
		 * Filters the contents of the new user notification email sent to the new user.
		 *
		 * @since 4.9.0
		 *
		 * @param array   $wp_new_user_notification_email {
		 *     Used to build wp_mail().
		 *
		 *     @type string $to      The intended recipient - New user email address.
		 *     @type string $subject The subject of the email.
		 *     @type string $message The body of the email.
		 *     @type string $headers The headers of the email.
		 * }
		 * @param WP_User $user     User object for new user.
		 * @param string  $blogname The site title.
		 */
		$wp_new_user_notification_email = apply_filters( 'wp_new_user_notification_email', $wp_new_user_notification_email, $user, $blogname );

		wp_mail(
			$wp_new_user_notification_email['to'],
			wp_specialchars_decode( sprintf( $wp_new_user_notification_email['subject'], $blogname ) ),
			$wp_new_user_notification_email['message'],
			$wp_new_user_notification_email['headers']
		);

		if ( $switched_locale ) {
			restore_previous_locale();
		}
	}
endif;

if ( ! function_exists( 'wp_nonce_tick' ) ) :
	/**
	 * Returns the time-dependent variable for nonce creation.
	 *
	 * A nonce has a lifespan of two ticks. Nonces in their second tick may be
	 * updated, e.g. by autosave.
	 *
	 * @since 2.5.0
	 * @since 6.1.0 Added `$action` argument.
	 *
	 * @param string|int $action Optional. The nonce action. Default -1.
	 * @return float Float value rounded up to the next highest integer.
	 */
	function wp_nonce_tick( $action = -1 ) {
		/**
		 * Filters the lifespan of nonces in seconds.
		 *
		 * @since 2.5.0
		 * @since 6.1.0 Added `$action` argument to allow for more targeted filters.
		 *
		 * @param int        $lifespan Lifespan of nonces in seconds. Default 86,400 seconds, or one day.
		 * @param string|int $action   The nonce action, or -1 if none was provided.
		 */
		$nonce_life = apply_filters( 'nonce_life', DAY_IN_SECONDS, $action );

		return ceil( time() / ( $nonce_life / 2 ) );
	}
endif;

if ( ! function_exists( 'wp_verify_nonce' ) ) :
	/**
	 * Verifies that a correct security nonce was used with time limit.
	 *
	 * A nonce is valid for 24 hours (by default).
	 *
	 * @since 2.0.3
	 *
	 * @param string     $nonce  Nonce value that was used for verification, usually via a form field.
	 * @param string|int $action Should give context to what is taking place and be the same when nonce was created.
	 * @return int|false 1 if the nonce is valid and generated between 0-12 hours ago,
	 *                   2 if the nonce is valid and generated between 12-24 hours ago.
	 *                   False if the nonce is invalid.
	 */
	function wp_verify_nonce( $nonce, $action = -1 ) {
		$nonce = (string) $nonce;
		$user  = wp_get_current_user();
		$uid   = (int) $user->ID;
		if ( ! $uid ) {
			/**
			 * Filters whether the user who generated the nonce is logged out.
			 *
			 * @since 3.5.0
			 *
			 * @param int        $uid    ID of the nonce-owning user.
			 * @param string|int $action The nonce action, or -1 if none was provided.
			 */
			$uid = apply_filters( 'nonce_user_logged_out', $uid, $action );
		}

		if ( empty( $nonce ) ) {
			return false;
		}

		$token = wp_get_session_token();
		$i     = wp_nonce_tick( $action );

		// Nonce generated 0-12 hours ago.
		$expected = substr( wp_hash( $i . '|' . $action . '|' . $uid . '|' . $token, 'nonce' ), -12, 10 );
		if ( hash_equals( $expected, $nonce ) ) {
			return 1;
		}

		// Nonce generated 12-24 hours ago.
		$expected = substr( wp_hash( ( $i - 1 ) . '|' . $action . '|' . $uid . '|' . $token, 'nonce' ), -12, 10 );
		if ( hash_equals( $expected, $nonce ) ) {
			return 2;
		}

		/**
		 * Fires when nonce verification fails.
		 *
		 * @since 4.4.0
		 *
		 * @param string     $nonce  The invalid nonce.
		 * @param string|int $action The nonce action.
		 * @param WP_User    $user   The current user object.
		 * @param string     $token  The user's session token.
		 */
		do_action( 'wp_verify_nonce_failed', $nonce, $action, $user, $token );

		// Invalid nonce.
		return false;
	}
endif;

if ( ! function_exists( 'wp_create_nonce' ) ) :
	/**
	 * Creates a cryptographic token tied to a specific action, user, user session,
	 * and window of time.
	 *
	 * @since 2.0.3
	 * @since 4.0.0 Session tokens were integrated with nonce creation.
	 *
	 * @param string|int $action Scalar value to add context to the nonce.
	 * @return string The token.
	 */
	function wp_create_nonce( $action = -1 ) {
		$user = wp_get_current_user();
		$uid  = (int) $user->ID;
		if ( ! $uid ) {
			/** This filter is documented in wp-includes/pluggable.php */
			$uid = apply_filters( 'nonce_user_logged_out', $uid, $action );
		}

		$token = wp_get_session_token();
		$i     = wp_nonce_tick( $action );

		return substr( wp_hash( $i . '|' . $action . '|' . $uid . '|' . $token, 'nonce' ), -12, 10 );
	}
endif;

if ( ! function_exists( 'wp_salt' ) ) :
	/**
	 * Returns a salt to add to hashes.
	 *
	 * Salts are created using secret keys. Secret keys are located in two places:
	 * in the database and in the wp-config.php file. The secret key in the database
	 * is randomly generated and will be appended to the secret keys in wp-config.php.
	 *
	 * The secret keys in wp-config.php should be updated to strong, random keys to maximize
	 * security. Below is an example of how the secret key constants are defined.
	 * Do not paste this example directly into wp-config.php. Instead, have a
	 * {@link https://api.wordpress.org/secret-key/1.1/salt/ secret key created} just
	 * for you.
	 *
	 *     define('AUTH_KEY',         ' Xakm<o xQy rw4EMsLKM-?!T+,PFF})H4lzcW57AF0U@N@< >M%G4Yt>f`z]MON');
	 *     define('SECURE_AUTH_KEY',  'LzJ}op]mr|6+![P}Ak:uNdJCJZd>(Hx.-Mh#Tz)pCIU#uGEnfFz|f ;;eU%/U^O~');
	 *     define('LOGGED_IN_KEY',    '|i|Ux`9<p-h$aFf(qnT:sDO:D1P^wZ$$/Ra@miTJi9G;ddp_<q}6H1)o|a +&JCM');
	 *     define('NONCE_KEY',        '%:R{[P|,s.KuMltH5}cI;/k<Gx~j!f0I)m_sIyu+&NJZ)-iO>z7X>QYR0Z_XnZ@|');
	 *     define('AUTH_SALT',        'eZyT)-Naw]F8CwA*VaW#q*|.)g@o}||wf~@C-YSt}(dh_r6EbI#A,y|nU2{B#JBW');
	 *     define('SECURE_AUTH_SALT', '!=oLUTXh,QW=H `}`L|9/^4-3 STz},T(w}W<I`.JjPi)<Bmf1v,HpGe}T1:Xt7n');
	 *     define('LOGGED_IN_SALT',   '+XSqHc;@Q*K_b|Z?NC[3H!!EONbh.n<+=uKR:>*c(u`g~EJBf#8u#R{mUEZrozmm');
	 *     define('NONCE_SALT',       'h`GXHhD>SLWVfg1(1(N{;.V!MoE(SfbA_ksP@&`+AycHcAV$+?@3q+rxV{%^VyKT');
	 *
	 * Salting passwords helps against tools which has stored hashed values of
	 * common dictionary strings. The added values makes it harder to crack.
	 *
	 * @since 2.5.0
	 *
	 * @link https://api.wordpress.org/secret-key/1.1/salt/ Create secrets for wp-config.php
	 *
	 * @param string $scheme Authentication scheme (auth, secure_auth, logged_in, nonce).
	 * @return string Salt value
	 */
	function wp_salt( $scheme = 'auth' ) {
		static $cached_salts = array();
		if ( isset( $cached_salts[ $scheme ] ) ) {
			/**
			 * Filters the WordPress salt.
			 *
			 * @since 2.5.0
			 *
			 * @param string $cached_salt Cached salt for the given scheme.
			 * @param string $scheme      Authentication scheme. Values include 'auth',
			 *                            'secure_auth', 'logged_in', and 'nonce'.
			 */
			return apply_filters( 'salt', $cached_salts[ $scheme ], $scheme );
		}

		static $duplicated_keys;
		if ( null === $duplicated_keys ) {
			$duplicated_keys = array(
				'put your unique phrase here' => true,
			);

			/*
			 * translators: This string should only be translated if wp-config-sample.php is localized.
			 * You can check the localized release package or
			 * https://i18n.svn.wordpress.org/<locale code>/branches/<wp version>/dist/wp-config-sample.php
			 */
			$duplicated_keys[ __( 'put your unique phrase here' ) ] = true;

			foreach ( array( 'AUTH', 'SECURE_AUTH', 'LOGGED_IN', 'NONCE', 'SECRET' ) as $first ) {
				foreach ( array( 'KEY', 'SALT' ) as $second ) {
					if ( ! defined( "{$first}_{$second}" ) ) {
						continue;
					}
					$value                     = constant( "{$first}_{$second}" );
					$duplicated_keys[ $value ] = isset( $duplicated_keys[ $value ] );
				}
			}
		}

		$values = array(
			'key'  => '',
			'salt' => '',
		);
		if ( defined( 'SECRET_KEY' ) && SECRET_KEY && empty( $duplicated_keys[ SECRET_KEY ] ) ) {
			$values['key'] = SECRET_KEY;
		}
		if ( 'auth' === $scheme && defined( 'SECRET_SALT' ) && SECRET_SALT && empty( $duplicated_keys[ SECRET_SALT ] ) ) {
			$values['salt'] = SECRET_SALT;
		}

		if ( in_array( $scheme, array( 'auth', 'secure_auth', 'logged_in', 'nonce' ), true ) ) {
			foreach ( array( 'key', 'salt' ) as $type ) {
				$const = strtoupper( "{$scheme}_{$type}" );
				if ( defined( $const ) && constant( $const ) && empty( $duplicated_keys[ constant( $const ) ] ) ) {
					$values[ $type ] = constant( $const );
				} elseif ( ! $values[ $type ] ) {
					$values[ $type ] = get_site_option( "{$scheme}_{$type}" );
					if ( ! $values[ $type ] ) {
						$values[ $type ] = wp_generate_password( 64, true, true );
						update_site_option( "{$scheme}_{$type}", $values[ $type ] );
					}
				}
			}
		} else {
			if ( ! $values['key'] ) {
				$values['key'] = get_site_option( 'secret_key' );
				if ( ! $values['key'] ) {
					$values['key'] = wp_generate_password( 64, true, true );
					update_site_option( 'secret_key', $values['key'] );
				}
			}
			$values['salt'] = hash_hmac( 'md5', $scheme, $values['key'] );
		}

		$cached_salts[ $scheme ] = $values['key'] . $values['salt'];

		/** This filter is documented in wp-includes/pluggable.php */
		return apply_filters( 'salt', $cached_salts[ $scheme ], $scheme );
	}
endif;

if ( ! function_exists( 'wp_hash' ) ) :
	/**
	 * Gets hash of given string.
	 *
	 * @since 2.0.3
	 *
	 * @param string $data   Plain text to hash.
	 * @param string $scheme Authentication scheme (auth, secure_auth, logged_in, nonce).
	 * @return string Hash of $data.
	 */
	function wp_hash( $data, $scheme = 'auth' ) {
		$salt = wp_salt( $scheme );

		return hash_hmac( 'md5', $data, $salt );
	}
endif;

if ( ! function_exists( 'wp_hash_password' ) ) :
	/**
	 * Creates a hash (encrypt) of a plain text password.
	 *
	 * For integration with other applications, this function can be overwritten to
	 * instead use the other package password checking algorithm.
	 *
	 * @since 2.5.0
	 *
	 * @global PasswordHash $wp_hasher PHPass object.
	 *
	 * @param string $password Plain text user password to hash.
	 * @return string The hash string of the password.
	 */
	function wp_hash_password( $password ) {
		global $wp_hasher;

		if ( empty( $wp_hasher ) ) {
			require_once ABSPATH . WPINC . '/class-phpass.php';
			// By default, use the portable hash from phpass.
			$wp_hasher = new PasswordHash( 8, true );
		}

		return $wp_hasher->HashPassword( trim( $password ) );
	}
endif;

if ( ! function_exists( 'wp_check_password' ) ) :
	/**
	 * Checks the plaintext password against the encrypted Password.
	 *
	 * Maintains compatibility between old version and the new cookie authentication
	 * protocol using PHPass library. The $hash parameter is the encrypted password
	 * and the function compares the plain text password when encrypted similarly
	 * against the already encrypted password to see if they match.
	 *
	 * For integration with other applications, this function can be overwritten to
	 * instead use the other package password checking algorithm.
	 *
	 * @since 2.5.0
	 *
	 * @global PasswordHash $wp_hasher PHPass object used for checking the password
	 *                                 against the $hash + $password.
	 * @uses PasswordHash::CheckPassword
	 *
	 * @param string     $password Plaintext user's password.
	 * @param string     $hash     Hash of the user's password to check against.
	 * @param string|int $user_id  Optional. User ID.
	 * @return bool False, if the $password does not match the hashed password.
	 */
	function wp_check_password( $password, $hash, $user_id = '' ) {
		global $wp_hasher;

		// If the hash is still md5...
		if ( strlen( $hash ) <= 32 ) {
			$check = hash_equals( $hash, md5( $password ) );
			if ( $check && $user_id ) {
				// Rehash using new hash.
				wp_set_password( $password, $user_id );
				$hash = wp_hash_password( $password );
			}

			/**
			 * Filters whether the plaintext password matches the encrypted password.
			 *
			 * @since 2.5.0
			 *
			 * @param bool       $check    Whether the passwords match.
			 * @param string     $password The plaintext password.
			 * @param string     $hash     The hashed password.
			 * @param string|int $user_id  User ID. Can be empty.
			 */
			return apply_filters( 'check_password', $check, $password, $hash, $user_id );
		}

		/*
		 * If the stored hash is longer than an MD5,
		 * presume the new style phpass portable hash.
		 */
		if ( empty( $wp_hasher ) ) {
			require_once ABSPATH . WPINC . '/class-phpass.php';
			// By default, use the portable hash from phpass.
			$wp_hasher = new PasswordHash( 8, true );
		}

		$check = $wp_hasher->CheckPassword( $password, $hash );

		/** This filter is documented in wp-includes/pluggable.php */
		return apply_filters( 'check_password', $check, $password, $hash, $user_id );
	}
endif;

if ( ! function_exists( 'wp_generate_password' ) ) :
	/**
	 * Generates a random password drawn from the defined set of characters.
	 *
	 * Uses wp_rand() to create passwords with far less predictability
	 * than similar native PHP functions like `rand()` or `mt_rand()`.
	 *
	 * @since 2.5.0
	 *
	 * @param int  $length              Optional. The length of password to generate. Default 12.
	 * @param bool $special_chars       Optional. Whether to include standard special characters.
	 *                                  Default true.
	 * @param bool $extra_special_chars Optional. Whether to include other special characters.
	 *                                  Used when generating secret keys and salts. Default false.
	 * @return string The random password.
	 */
	function wp_generate_password( $length = 12, $special_chars = true, $extra_special_chars = false ) {
		$chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
		if ( $special_chars ) {
			$chars .= '!@#$%^&*()';
		}
		if ( $extra_special_chars ) {
			$chars .= '-_ []{}<>~`+=,.;:/?|';
		}

		$password = '';
		for ( $i = 0; $i < $length; $i++ ) {
			$password .= substr( $chars, wp_rand( 0, strlen( $chars ) - 1 ), 1 );
		}

		/**
		 * Filters the randomly-generated password.
		 *
		 * @since 3.0.0
		 * @since 5.3.0 Added the `$length`, `$special_chars`, and `$extra_special_chars` parameters.
		 *
		 * @param string $password            The generated password.
		 * @param int    $length              The length of password to generate.
		 * @param bool   $special_chars       Whether to include standard special characters.
		 * @param bool   $extra_special_chars Whether to include other special characters.
		 */
		return apply_filters( 'random_password', $password, $length, $special_chars, $extra_special_chars );
	}
endif;

if ( ! function_exists( 'wp_rand' ) ) :
	/**
	 * Generates a random non-negative number.
	 *
	 * @since 2.6.2
	 * @since 4.4.0 Uses PHP7 random_int() or the random_compat library if available.
	 * @since 6.1.0 Returns zero instead of a random number if both `$min` and `$max` are zero.
	 *
	 * @global string $rnd_value
	 *
	 * @param int $min Optional. Lower limit for the generated number.
	 *                 Accepts positive integers or zero. Defaults to 0.
	 * @param int $max Optional. Upper limit for the generated number.
	 *                 Accepts positive integers. Defaults to 4294967295.
	 * @return int A random non-negative number between min and max.
	 */
	function wp_rand( $min = null, $max = null ) {
		global $rnd_value;

		/*
		 * Some misconfigured 32-bit environments (Entropy PHP, for example)
		 * truncate integers larger than PHP_INT_MAX to PHP_INT_MAX rather than overflowing them to floats.
		 */
		$max_random_number = 3000000000 === 2147483647 ? (float) '4294967295' : 4294967295; // 4294967295 = 0xffffffff

		if ( null === $min ) {
			$min = 0;
		}

		if ( null === $max ) {
			$max = $max_random_number;
		}

		// We only handle ints, floats are truncated to their integer value.
		$min = (int) $min;
		$max = (int) $max;

		// Use PHP's CSPRNG, or a compatible method.
		static $use_random_int_functionality = true;
		if ( $use_random_int_functionality ) {
			try {
				// wp_rand() can accept arguments in either order, PHP cannot.
				$_max = max( $min, $max );
				$_min = min( $min, $max );
				$val  = random_int( $_min, $_max );
				if ( false !== $val ) {
					return absint( $val );
				} else {
					$use_random_int_functionality = false;
				}
			} catch ( Error $e ) {
				$use_random_int_functionality = false;
			} catch ( Exception $e ) {
				$use_random_int_functionality = false;
			}
		}

		/*
		 * Reset $rnd_value after 14 uses.
		 * 32 (md5) + 40 (sha1) + 40 (sha1) / 8 = 14 random numbers from $rnd_value.
		 */
		if ( strlen( $rnd_value ) < 8 ) {
			if ( defined( 'WP_SETUP_CONFIG' ) ) {
				static $seed = '';
			} else {
				$seed = get_transient( 'random_seed' );
			}
			$rnd_value  = md5( uniqid( microtime() . mt_rand(), true ) . $seed );
			$rnd_value .= sha1( $rnd_value );
			$rnd_value .= sha1( $rnd_value . $seed );
			$seed       = md5( $seed . $rnd_value );
			if ( ! defined( 'WP_SETUP_CONFIG' ) && ! defined( 'WP_INSTALLING' ) ) {
				set_transient( 'random_seed', $seed );
			}
		}

		// Take the first 8 digits for our value.
		$value = substr( $rnd_value, 0, 8 );

		// Strip the first eight, leaving the remainder for the next call to wp_rand().
		$rnd_value = substr( $rnd_value, 8 );

		$value = abs( hexdec( $value ) );

		// Reduce the value to be within the min - max range.
		$value = $min + ( $max - $min + 1 ) * $value / ( $max_random_number + 1 );

		return abs( (int) $value );
	}
endif;

if ( ! function_exists( 'wp_set_password' ) ) :
	/**
	 * Updates the user's password with a new encrypted one.
	 *
	 * For integration with other applications, this function can be overwritten to
	 * instead use the other package password checking algorithm.
	 *
	 * Please note: This function should be used sparingly and is really only meant for single-time
	 * application. Leveraging this improperly in a plugin or theme could result in an endless loop
	 * of password resets if precautions are not taken to ensure it does not execute on every page load.
	 *
	 * @since 2.5.0
	 *
	 * @global wpdb $wpdb WordPress database abstraction object.
	 *
	 * @param string $password The plaintext new user password.
	 * @param int    $user_id  User ID.
	 */
	function wp_set_password( $password, $user_id ) {
		global $wpdb;

		$hash = wp_hash_password( $password );
		$wpdb->update(
			$wpdb->users,
			array(
				'user_pass'           => $hash,
				'user_activation_key' => '',
			),
			array( 'ID' => $user_id )
		);

		clean_user_cache( $user_id );

		/**
		 * Fires after the user password is set.
		 *
		 * @since 6.2.0
		 *
		 * @param string $password The plaintext password just set.
		 * @param int    $user_id  The ID of the user whose password was just set.
		 */
		do_action( 'wp_set_password', $password, $user_id );
	}
endif;

if ( ! function_exists( 'get_avatar' ) ) :
	/**
	 * Retrieves the avatar `<img>` tag for a user, email address, MD5 hash, comment, or post.
	 *
	 * @since 2.5.0
	 * @since 4.2.0 Added the optional `$args` parameter.
	 * @since 5.5.0 Added the `loading` argument.
	 * @since 6.1.0 Added the `decoding` argument.
	 * @since 6.3.0 Added the `fetchpriority` argument.
	 *
	 * @param mixed  $id_or_email   The avatar to retrieve. Accepts a user ID, Gravatar MD5 hash,
	 *                              user email, WP_User object, WP_Post object, or WP_Comment object.
	 * @param int    $size          Optional. Height and width of the avatar in pixels. Default 96.
	 * @param string $default_value URL for the default image or a default type. Accepts:
	 *                              - '404' (return a 404 instead of a default image)
	 *                              - 'retro' (a 8-bit arcade-style pixelated face)
	 *                              - 'robohash' (a robot)
	 *                              - 'monsterid' (a monster)
	 *                              - 'wavatar' (a cartoon face)
	 *                              - 'identicon' (the "quilt", a geometric pattern)
	 *                              - 'mystery', 'mm', or 'mysteryman' (The Oyster Man)
	 *                              - 'blank' (transparent GIF)
	 *                              - 'gravatar_default' (the Gravatar logo)
	 *                              Default is the value of the 'avatar_default' option,
	 *                              with a fallback of 'mystery'.
	 * @param string $alt           Optional. Alternative text to use in the avatar image tag.
	 *                              Default empty.
	 * @param array  $args {
	 *     Optional. Extra arguments to retrieve the avatar.
	 *
	 *     @type int          $height        Display height of the avatar in pixels. Defaults to $size.
	 *     @type int          $width         Display width of the avatar in pixels. Defaults to $size.
	 *     @type bool         $force_default Whether to always show the default image, never the Gravatar.
	 *                                       Default false.
	 *     @type string       $rating        What rating to display avatars up to. Accepts:
	 *                                       - 'G' (suitable for all audiences)
	 *                                       - 'PG' (possibly offensive, usually for audiences 13 and above)
	 *                                       - 'R' (intended for adult audiences above 17)
	 *                                       - 'X' (even more mature than above)
	 *                                       Default is the value of the 'avatar_rating' option.
	 *     @type string       $scheme        URL scheme to use. See set_url_scheme() for accepted values.
	 *                                       Default null.
	 *     @type array|string $class         Array or string of additional classes to add to the img element.
	 *                                       Default null.
	 *     @type bool         $force_display Whether to always show the avatar - ignores the show_avatars option.
	 *                                       Default false.
	 *     @type string       $loading       Value for the `loading` attribute.
	 *                                       Default null.
	 *     @type string       $fetchpriority Value for the `fetchpriority` attribute.
	 *                                       Default null.
	 *     @type string       $decoding      Value for the `decoding` attribute.
	 *                                       Default null.
	 *     @type string       $extra_attr    HTML attributes to insert in the IMG element. Is not sanitized.
	 *                                       Default empty.
	 * }
	 * @return string|false `<img>` tag for the user's avatar. False on failure.
	 */
	function get_avatar( $id_or_email, $size = 96, $default_value = '', $alt = '', $args = null ) {
		$defaults = array(
			// get_avatar_data() args.
			'size'          => 96,
			'height'        => null,
			'width'         => null,
			'default'       => get_option( 'avatar_default', 'mystery' ),
			'force_default' => false,
			'rating'        => get_option( 'avatar_rating' ),
			'scheme'        => null,
			'alt'           => '',
			'class'         => null,
			'force_display' => false,
			'loading'       => null,
			'fetchpriority' => null,
			'decoding'      => null,
			'extra_attr'    => '',
		);

		if ( empty( $args ) ) {
			$args = array();
		}

		$args['size']    = (int) $size;
		$args['default'] = $default_value;
		$args['alt']     = $alt;

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

		if ( empty( $args['height'] ) ) {
			$args['height'] = $args['size'];
		}
		if ( empty( $args['width'] ) ) {
			$args['width'] = $args['size'];
		}

		// Update args with loading optimized attributes.
		$loading_optimization_attr = wp_get_loading_optimization_attributes( 'img', $args, 'get_avatar' );

		$args = array_merge( $args, $loading_optimization_attr );

		if ( is_object( $id_or_email ) && isset( $id_or_email->comment_ID ) ) {
			$id_or_email = get_comment( $id_or_email );
		}

		/**
		 * Allows the HTML for a user's avatar to be returned early.
		 *
		 * Returning a non-null value will effectively short-circuit get_avatar(), passing
		 * the value through the {@see 'get_avatar'} filter and returning early.
		 *
		 * @since 4.2.0
		 *
		 * @param string|null $avatar      HTML for the user's avatar. Default null.
		 * @param mixed       $id_or_email The avatar to retrieve. Accepts a user ID, Gravatar MD5 hash,
		 *                                 user email, WP_User object, WP_Post object, or WP_Comment object.
		 * @param array       $args        Arguments passed to get_avatar_url(), after processing.
		 */
		$avatar = apply_filters( 'pre_get_avatar', null, $id_or_email, $args );

		if ( ! is_null( $avatar ) ) {
			/** This filter is documented in wp-includes/pluggable.php */
			return apply_filters( 'get_avatar', $avatar, $id_or_email, $args['size'], $args['default'], $args['alt'], $args );
		}

		if ( ! $args['force_display'] && ! get_option( 'show_avatars' ) ) {
			return false;
		}

		$url2x = get_avatar_url( $id_or_email, array_merge( $args, array( 'size' => $args['size'] * 2 ) ) );

		$args = get_avatar_data( $id_or_email, $args );

		$url = $args['url'];

		if ( ! $url || is_wp_error( $url ) ) {
			return false;
		}

		$class = array( 'avatar', 'avatar-' . (int) $args['size'], 'photo' );

		if ( ! $args['found_avatar'] || $args['force_default'] ) {
			$class[] = 'avatar-default';
		}

		if ( $args['class'] ) {
			if ( is_array( $args['class'] ) ) {
				$class = array_merge( $class, $args['class'] );
			} else {
				$class[] = $args['class'];
			}
		}

		// Add `loading`, `fetchpriority`, and `decoding` attributes.
		$extra_attr = $args['extra_attr'];

		if ( in_array( $args['loading'], array( 'lazy', 'eager' ), true )
			&& ! preg_match( '/\bloading\s*=/', $extra_attr )
		) {
			if ( ! empty( $extra_attr ) ) {
				$extra_attr .= ' ';
			}

			$extra_attr .= "loading='{$args['loading']}'";
		}

		if ( in_array( $args['fetchpriority'], array( 'high', 'low', 'auto' ), true )
			&& ! preg_match( '/\bfetchpriority\s*=/', $extra_attr )
		) {
			if ( ! empty( $extra_attr ) ) {
				$extra_attr .= ' ';
			}

			$extra_attr .= "fetchpriority='{$args['fetchpriority']}'";
		}

		if ( in_array( $args['decoding'], array( 'async', 'sync', 'auto' ), true )
			&& ! preg_match( '/\bdecoding\s*=/', $extra_attr )
		) {
			if ( ! empty( $extra_attr ) ) {
				$extra_attr .= ' ';
			}

			$extra_attr .= "decoding='{$args['decoding']}'";
		}

		$avatar = sprintf(
			"<img alt='%s' src='%s' srcset='%s' class='%s' height='%d' width='%d' %s/>",
			esc_attr( $args['alt'] ),
			esc_url( $url ),
			esc_url( $url2x ) . ' 2x',
			esc_attr( implode( ' ', $class ) ),
			(int) $args['height'],
			(int) $args['width'],
			$extra_attr
		);

		/**
		 * Filters the HTML for a user's avatar.
		 *
		 * @since 2.5.0
		 * @since 4.2.0 Added the `$args` parameter.
		 *
		 * @param string $avatar        HTML for the user's avatar.
		 * @param mixed  $id_or_email   The avatar to retrieve. Accepts a user ID, Gravatar MD5 hash,
		 *                              user email, WP_User object, WP_Post object, or WP_Comment object.
		 * @param int    $size          Height and width of the avatar in pixels.
		 * @param string $default_value URL for the default image or a default type. Accepts:
		 *                              - '404' (return a 404 instead of a default image)
		 *                              - 'retro' (a 8-bit arcade-style pixelated face)
		 *                              - 'robohash' (a robot)
		 *                              - 'monsterid' (a monster)
		 *                              - 'wavatar' (a cartoon face)
		 *                              - 'identicon' (the "quilt", a geometric pattern)
		 *                              - 'mystery', 'mm', or 'mysteryman' (The Oyster Man)
		 *                              - 'blank' (transparent GIF)
		 *                              - 'gravatar_default' (the Gravatar logo)
		 * @param string $alt           Alternative text to use in the avatar image tag.
		 * @param array  $args          Arguments passed to get_avatar_data(), after processing.
		 */
		return apply_filters( 'get_avatar', $avatar, $id_or_email, $args['size'], $args['default'], $args['alt'], $args );
	}
endif;

if ( ! function_exists( 'wp_text_diff' ) ) :
	/**
	 * Displays a human readable HTML representation of the difference between two strings.
	 *
	 * The Diff is available for getting the changes between versions. The output is
	 * HTML, so the primary use is for displaying the changes. If the two strings
	 * are equivalent, then an empty string will be returned.
	 *
	 * @since 2.6.0
	 *
	 * @see wp_parse_args() Used to change defaults to user defined settings.
	 * @uses Text_Diff
	 * @uses WP_Text_Diff_Renderer_Table
	 *
	 * @param string       $left_string  "old" (left) version of string.
	 * @param string       $right_string "new" (right) version of string.
	 * @param string|array $args {
	 *     Associative array of options to pass to WP_Text_Diff_Renderer_Table().
	 *
	 *     @type string $title           Titles the diff in a manner compatible
	 *                                   with the output. Default empty.
	 *     @type string $title_left      Change the HTML to the left of the title.
	 *                                   Default empty.
	 *     @type string $title_right     Change the HTML to the right of the title.
	 *                                   Default empty.
	 *     @type bool   $show_split_view True for split view (two columns), false for
	 *                                   un-split view (single column). Default true.
	 * }
	 * @return string Empty string if strings are equivalent or HTML with differences.
	 */
	function wp_text_diff( $left_string, $right_string, $args = null ) {
		$defaults = array(
			'title'           => '',
			'title_left'      => '',
			'title_right'     => '',
			'show_split_view' => true,
		);
		$args     = wp_parse_args( $args, $defaults );

		if ( ! class_exists( 'WP_Text_Diff_Renderer_Table', false ) ) {
			require ABSPATH . WPINC . '/wp-diff.php';
		}

		$left_string  = normalize_whitespace( $left_string );
		$right_string = normalize_whitespace( $right_string );

		$left_lines  = explode( "\n", $left_string );
		$right_lines = explode( "\n", $right_string );
		$text_diff   = new Text_Diff( $left_lines, $right_lines );
		$renderer    = new WP_Text_Diff_Renderer_Table( $args );
		$diff        = $renderer->render( $text_diff );

		if ( ! $diff ) {
			return '';
		}

		$is_split_view       = ! empty( $args['show_split_view'] );
		$is_split_view_class = $is_split_view ? ' is-split-view' : '';

		$r = "<table class='diff$is_split_view_class'>\n";

		if ( $args['title'] ) {
			$r .= "<caption class='diff-title'>$args[title]</caption>\n";
		}

		if ( $args['title_left'] || $args['title_right'] ) {
			$r .= '<thead>';
		}

		if ( $args['title_left'] || $args['title_right'] ) {
			$th_or_td_left  = empty( $args['title_left'] ) ? 'td' : 'th';
			$th_or_td_right = empty( $args['title_right'] ) ? 'td' : 'th';

			$r .= "<tr class='diff-sub-title'>\n";
			$r .= "\t<$th_or_td_left>$args[title_left]</$th_or_td_left>\n";
			if ( $is_split_view ) {
				$r .= "\t<$th_or_td_right>$args[title_right]</$th_or_td_right>\n";
			}
			$r .= "</tr>\n";
		}

		if ( $args['title_left'] || $args['title_right'] ) {
			$r .= "</thead>\n";
		}

		$r .= "<tbody>\n$diff\n</tbody>\n";
		$r .= '</table>';

		return $r;
	}
endif;