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<?php
/**
 * Block state support for frontend CSS generation.
 *
 * Generates scoped CSS for per-instance state styles declared in block attributes,
 * including pseudo-states (e.g., `style[':hover']`) and responsive states
 * (e.g., `style['@mobile']` and `style['@mobile'][':hover']`).
 *
 * @package WordPress
 * @since 7.1.0
 */

/**
 * Converts internal preset references to CSS custom property references.
 *
 * State styles are emitted as CSS rules and cannot rely on preset classnames.
 * Converting `var:preset|color|contrast` to
 * `var(--wp--preset--color--contrast)` ensures preset values are emitted as
 * declarations by the style engine.
 *
 * @since 7.1.0
 *
 * @param mixed $value Style value to normalize.
 * @return mixed Normalized style value.
 */
function wp_normalize_state_preset_vars( $value ) {
	if ( is_array( $value ) ) {
		foreach ( $value as $key => $nested_value ) {
			$value[ $key ] = wp_normalize_state_preset_vars( $nested_value );
		}
		return $value;
	}

if ( ! is_string( $value ) || ! str_starts_with( $value, 'var:preset|' ) ) {
		return $value;
	}

$unwrapped_name = str_replace( '|', '--', substr( $value, strlen( 'var:' ) ) );
	return "var(--wp--$unwrapped_name)";
}

/**
 * Normalizes a state style object before generating CSS declarations.
 *
 * @since 7.1.0
 *
 * @param array $style State style object.
 * @return array Normalized state style object.
 */
function wp_normalize_state_style_for_css_output( $style ) {
	// Layout is processed separately by wp_render_layout_support_flag(), so we remove it before declaration generation.
	unset( $style['layout'] );
	$style = wp_normalize_state_preset_vars( $style );
	return $style;
}

/**
 * Adds fallback border-style declarations for visible border declarations.
 *
 * CSS does not render border color or width unless a border style is also set.
 * State styles are emitted as stylesheet rules rather than inline styles, so
 * they cannot rely on the block-library inline-style attribute fallback rules.
 *
 * @since 7.1.0
 *
 * @param array $declarations CSS declarations generated by the style engine.
 * @return array CSS declarations with fallback border styles applied where needed.
 */
function wp_get_state_declarations_with_fallback_border_styles( $declarations ) {
	if ( ! is_array( $declarations ) ) {
		return $declarations;
	}

$has_border_style = isset( $declarations['border-style'] ) && '' !== $declarations['border-style'];
	$has_border_color = isset( $declarations['border-color'] ) && '' !== $declarations['border-color'];
	$has_border_width = isset( $declarations['border-width'] ) && '' !== $declarations['border-width'];

if ( ! $has_border_style && ( $has_border_color || $has_border_width ) ) {
		$declarations['border-style'] = 'solid';
	}

$sides = array( 'top', 'right', 'bottom', 'left' );
	foreach ( $sides as $side ) {
		$side_style_property = "border-$side-style";
		$side_color_property = "border-$side-color";
		$side_width_property = "border-$side-width";

$has_side_style = isset( $declarations[ $side_style_property ] ) && '' !== $declarations[ $side_style_property ];
		$has_side_color = isset( $declarations[ $side_color_property ] ) && '' !== $declarations[ $side_color_property ];
		$has_side_width = isset( $declarations[ $side_width_property ] ) && '' !== $declarations[ $side_width_property ];

if ( ! $has_border_style && ! $has_side_style && ( $has_side_color || $has_side_width ) ) {
			$declarations[ $side_style_property ] = 'solid';
		}
	}

return $declarations;
}

/**
 * Adds background reset declarations to prevent gradient/solid color conflicts.
 *
 * When a state sets a solid background-color, any gradient applied to the
 * default state (via `background` shorthand or `background-image`) must be
 * explicitly cleared. Without this, the gradient image layer remains visible
 * on top of the solid hover color even when `!important` is used, because
 * `background-color` and `background-image` are separate CSS properties.
 *
 * @since 7.1.0
 *
 * @param array $declarations CSS declarations generated by the style engine.
 * @return array CSS declarations with background resets applied where needed.
 */
function wp_get_state_declarations_with_background_resets( $declarations ) {
	if ( ! is_array( $declarations ) ) {
		return $declarations;
	}

$has_background_color = isset( $declarations['background-color'] ) && '' !== $declarations['background-color'];
	$has_background       = isset( $declarations['background'] ) && '' !== $declarations['background'];
	$has_background_image = isset( $declarations['background-image'] ) && '' !== $declarations['background-image'];

/*
	 * When the state sets a solid background-color but no gradient of its own,
	 * emit `background-image: unset` to clear any gradient (whether stored as
	 * the `background` shorthand or as `background-image`) that was applied to
	 * the default / normal state via an inline style attribute. The declaration
	 * is marked important when the state rule is registered with the style engine.
	 */
	if ( $has_background_color && ! $has_background && ! $has_background_image ) {
		$declarations['background-image'] = 'unset';
	}

return $declarations;
}

/**
 * Adds fallback dimension styles for aspectRatio and height block-support values.
 *
 * @since 7.1.0
 *
 * @param array $state_style State style object.
 * @return array State style object with fallback dimension styles applied where needed.
 */
function wp_get_state_style_with_fallback_dimension_styles( $state_style ) {
	if ( ! is_array( $state_style ) ) {
		return $state_style;
	}

$dimensions = isset( $state_style['dimensions'] ) && is_array( $state_style['dimensions'] )
		? $state_style['dimensions']
		: array();

if ( empty( $dimensions ) ) {
		return $state_style;
	}

if ( wp_is_explicit_aspect_ratio_value( $dimensions['aspectRatio'] ?? null ) ) {
		return array_replace_recursive(
			$state_style,
			array(
				'dimensions' => array(
					'minHeight' => 'unset',
					'height'    => 'unset',
				),
			)
		);
	}

$has_min_height = isset( $dimensions['minHeight'] ) && ( is_string( $dimensions['minHeight'] ) || is_numeric( $dimensions['minHeight'] ) ) && '' !== trim( (string) $dimensions['minHeight'] );
	$has_height     = isset( $dimensions['height'] ) && ( is_string( $dimensions['height'] ) || is_numeric( $dimensions['height'] ) ) && '' !== trim( (string) $dimensions['height'] );

if ( $has_min_height || $has_height ) {
		return array_replace_recursive(
			$state_style,
			array(
				'dimensions' => array(
					'aspectRatio' => 'unset',
				),
			)
		);
	}

return $state_style;
}

/**
 * Adds a style fragment to a selector-keyed state style group.
 *
 * @since 7.1.0
 *
 * @param array       $groups   Selector-keyed style groups.
 * @param string|null $selector Block or feature selector.
 * @param array       $style    Style fragment.
 */
function wp_add_state_style_group( &$groups, $selector, $style ) {
	$key = is_string( $selector ) ? $selector : '';

if ( ! isset( $groups[ $key ] ) ) {
		$groups[ $key ] = array(
			'selector' => $selector,
			'style'    => array(),
		);
	}

$groups[ $key ]['style'] = array_replace_recursive( $groups[ $key ]['style'], $style );
}

/**
 * Splits a state style object into groups based on block feature selectors.
 *
 * @since 7.1.0
 *
 * @param array $state_style     State style object.
 * @param array $block_selectors Block selectors metadata.
 * @return array[] Selector/style groups.
 */
function wp_get_state_style_groups( $state_style, $block_selectors ) {
	$groups = array();

foreach ( $state_style as $feature => $feature_styles ) {
		$feature_selectors = $block_selectors[ $feature ] ?? null;

if ( is_string( $feature_selectors ) ) {
			wp_add_state_style_group(
				$groups,
				$feature_selectors,
				array( $feature => $feature_styles )
			);
			continue;
		}

if ( is_array( $feature_selectors ) && is_array( $feature_styles ) ) {
			$remaining_styles = $feature_styles;

foreach ( $feature_selectors as $subfeature => $subfeature_selector ) {
				if (
					'root' === $subfeature ||
					! is_string( $subfeature_selector ) ||
					! array_key_exists( $subfeature, $feature_styles )
				) {
					continue;
				}

wp_add_state_style_group(
					$groups,
					$subfeature_selector,
					array(
						$feature => array(
							$subfeature => $feature_styles[ $subfeature ],
						),
					)
				);
				unset( $remaining_styles[ $subfeature ] );
			}

if ( array() !== $remaining_styles ) {
				wp_add_state_style_group(
					$groups,
					$feature_selectors['root'] ?? ( $block_selectors['root'] ?? null ),
					array( $feature => $remaining_styles )
				);
			}
			continue;
		}

wp_add_state_style_group(
			$groups,
			$block_selectors['root'] ?? null,
			array( $feature => $feature_styles )
		);
	}

return array_values( $groups );
}

/**
 * Returns a style object with nested state keys removed.
 *
 * @since 7.1.0
 *
 * @param array $state_style State style object.
 * @param array $nested_keys Keys to remove from the root style object.
 * @return array Root-only style object.
 */
function wp_get_root_state_style( $state_style, $nested_keys ) {
	if ( ! is_array( $state_style ) ) {
		return $state_style;
	}

$root_style = $state_style;
	foreach ( $nested_keys as $key ) {
		unset( $root_style[ $key ] );
	}

return $root_style;
}

/**
 * Generates all element selectors for a block root selector.
 *
 * @since 7.1.0
 *
 * @param string $root_selector The block root CSS selector.
 * @return string[] Element selectors keyed by element name.
 */
function wp_get_block_state_element_selectors( $root_selector ) {
	if ( ! is_string( $root_selector ) || '' === trim( $root_selector ) ) {
		return array();
	}

$block_selectors   = wp_split_selector_list( $root_selector );
	$element_selectors = array();

foreach ( WP_Theme_JSON::ELEMENTS as $element_name => $element_selector ) {
		$selectors = array();

foreach ( $block_selectors as $block_selector ) {
			$block_selector = trim( $block_selector );
			if ( '' === $block_selector ) {
				continue;
			}

if ( $block_selector === $element_selector ) {
				$selectors = array( $element_selector );
				break;
			}

$selector_prefix = "$block_selector ";
			if ( ! str_contains( $element_selector, ',' ) ) {
				$selectors[] = $selector_prefix . $element_selector;
				continue;
			}

$prepended_selectors = array();
			foreach ( wp_split_selector_list( $element_selector ) as $selector ) {
				$prepended_selectors[] = $selector_prefix . $selector;
			}
			$selectors[] = implode( ',', $prepended_selectors );
		}

if ( ! empty( $selectors ) ) {
			$element_selectors[ $element_name ] = implode( ',', $selectors );
		}
	}

return $element_selectors;
}

/**
 * Adds a compiled state style rule to a rule list.
 *
 * @since 7.1.0
 *
 * @param array       $css_rules   Style rules.
 * @param string      $state       Pseudo-state selector.
 * @param string|null $selector    Block, feature, or element selector.
 * @param array       $style       Style object.
 * @param string|null $rules_group Optional CSS grouping rule, e.g. a media query.
 */
function wp_add_block_state_style_rule( &$css_rules, $state, $selector, $style, $rules_group = null ) {
	if ( empty( $style ) || ! is_array( $style ) ) {
		return;
	}

$compiled     = wp_style_engine_get_styles(
		wp_normalize_state_style_for_css_output( $style )
	);
	$declarations = $compiled['declarations'] ?? array();
	$text_align   = $style['typography']['textAlign'] ?? null;
	// Base text alignment is class-based, so state styles need a declaration.
	if ( is_string( $text_align ) && '' !== trim( $text_align ) ) {
		$declarations['text-align'] = $text_align;
	}

if ( empty( $declarations ) ) {
		return;
	}

$css_rules[] = array(
		'state'        => $state,
		'selector'     => $selector,
		'declarations' => $declarations,
	);
	if ( ! empty( $rules_group ) ) {
		$css_rules[ count( $css_rules ) - 1 ]['rules_group'] = $rules_group;
	}
}

/**
 * Builds compiled state style rules, preserving the selector each rule targets.
 *
 * @since 7.1.0
 *
 * @param array         $state_styles Map of state to style array.
 * @param WP_Block_Type $block_type   Block type.
 * @param string|null   $rules_group  Optional CSS grouping rule, e.g. a media query.
 * @return array[] State style rules.
 */
function wp_get_block_state_style_rules( $state_styles, $block_type, $rules_group = null ) {
	$css_rules       = array();
	$block_selectors = isset( $block_type->selectors ) && is_array( $block_type->selectors )
		? $block_type->selectors
		: array();

foreach ( $state_styles as $state => $state_style ) {
		if ( empty( $state_style ) || ! is_array( $state_style ) ) {
			continue;
		}

foreach ( wp_get_state_style_groups( $state_style, $block_selectors ) as $group ) {
			wp_add_block_state_style_rule(
				$css_rules,
				$state,
				$group['selector'],
				$group['style'],
				$rules_group
			);
		}
	}

return $css_rules;
}

/**
 * Returns a unique class for a set of state style rules.
 *
 * @since 7.1.0
 *
 * @param string $block_name Block name.
 * @param array  $css_rules  State style rules.
 * @return string Unique class name.
 */
function wp_get_block_state_unique_class( $block_name, $css_rules ) {
	return 'wp-states-' . substr(
		md5(
			wp_json_encode(
				array(
					'blockName' => $block_name,
					'rules'     => $css_rules,
				)
			)
		),
		0,
		8
	);
}

/**
 * Splits a selector list by top-level commas.
 *
 * @since 7.1.0
 *
 * @param string $selector CSS selector list.
 * @return string[] Selectors.
 */
function wp_split_selector_list( $selector ) {
	if ( ! str_contains( $selector, ',' ) ) {
		return array( $selector );
	}

$selectors         = array();
	$current_selector  = '';
	$parentheses_depth = 0;
	$selector_length   = strlen( $selector );

for ( $i = 0; $i < $selector_length; $i++ ) {
		$char = $selector[ $i ];

if ( '(' === $char ) {
			++$parentheses_depth;
		} elseif ( ')' === $char && $parentheses_depth > 0 ) {
			--$parentheses_depth;
		} elseif ( ',' === $char && 0 === $parentheses_depth ) {
			$selectors[]      = $current_selector;
			$current_selector = '';
			continue;
		}

$current_selector .= $char;
	}

$selectors[] = $current_selector;

return $selectors;
}

/**
 * Builds a scoped selector from a block selector and optional pseudo-state.
 *
 * @since 7.1.0
 *
 * @param string      $base_selector  Block-instance scoping selector.
 * @param string|null $block_selector Block or feature selector from metadata.
 * @param string      $state          Pseudo-state selector.
 * @return string Scoped selector.
 */
function wp_build_state_selector( $base_selector, $block_selector, $state ) {
	if ( ! is_string( $block_selector ) || '' === trim( $block_selector ) ) {
		return $base_selector . $state;
	}

$selectors        = wp_split_selector_list( $block_selector );
	$scoped_selectors = array();

foreach ( $selectors as $selector ) {
		$selector = trim( $selector );
		if ( '' === $selector ) {
			continue;
		}

/*
		 * Replace only the leading block selector part (e.g. class name,
		 * attribute selector, ID, or tag name) with the block instance selector.
		 * Preserve anything after that prefix, including modifier classes on the
		 * same element and combinators without spaces.
		 */
		if ( preg_match( '/^([.#]?[-_a-zA-Z0-9]+|\[[^\]]+\])/', $selector, $matches ) ) {
			$scoped_selectors[] = $base_selector . substr( $selector, strlen( $matches[0] ) ) . $state;
			continue;
		}

$scoped_selectors[] = $base_selector . $state;
	}

return empty( $scoped_selectors )
		? $base_selector . $state
		: implode( ', ', $scoped_selectors );
}

/**
 * Renders per-instance state styles on the frontend.
 *
 * @since 7.1.0
 *
 * @param string $block_content The block's rendered HTML.
 * @param array  $block         The block data including blockName and attrs.
 * @return string Modified block content with injected state styles.
 */
function wp_render_block_states_support( $block_content, $block ) {
	if ( empty( $block['blockName'] ) || empty( $block_content ) ) {
		return $block_content;
	}

/*
	 * Every CSS rule this function can produce is keyed off the block's `style`
	 * attribute. Without it there is nothing to generate, so bail before doing
	 * any of the lookups below — this runs for every block on every request.
	 */
	$style = $block['attrs']['style'] ?? array();
	if ( empty( $style ) || ! is_array( $style ) ) {
		return $block_content;
	}

$block_name = $block['blockName'];
	$block_type = WP_Block_Type_Registry::get_instance()->get_registered( $block_name );
	if ( ! $block_type ) {
		return $block_content;
	}

$supported_pseudo_states  = WP_Theme_JSON::VALID_BLOCK_PSEUDO_SELECTORS[ $block_name ] ?? array();
	$css_rules                = array();
	$viewport_settings        = wp_get_global_settings( array( 'viewport' ) );
	$responsive_media_queries = WP_Theme_JSON::get_viewport_media_queries( $viewport_settings );

foreach ( $supported_pseudo_states as $pseudo_state ) {
		if ( empty( $style[ $pseudo_state ] ) || ! is_array( $style[ $pseudo_state ] ) ) {
			continue;
		}

$css_rules = array_merge(
			$css_rules,
			wp_get_block_state_style_rules(
				array( $pseudo_state => $style[ $pseudo_state ] ),
				$block_type
			)
		);
	}

foreach ( $responsive_media_queries as $breakpoint => $media_query ) {
		if ( empty( $style[ $breakpoint ] ) || ! is_array( $style[ $breakpoint ] ) ) {
			continue;
		}

$root_state_style = wp_get_root_state_style(
			$style[ $breakpoint ],
			array_merge( array( 'elements' ), $supported_pseudo_states )
		);

if ( ! empty( $root_state_style ) ) {
			$css_rules = array_merge(
				$css_rules,
				wp_get_block_state_style_rules(
					array( '' => $root_state_style ),
					$block_type,
					$media_query
				)
			);
		}

if (
			! empty( $style[ $breakpoint ]['elements'] ) &&
			is_array( $style[ $breakpoint ]['elements'] )
		) {
			$element_selectors = wp_get_block_state_element_selectors(
				wp_get_block_css_selector( $block_type )
			);

foreach ( $style[ $breakpoint ]['elements'] as $element_name => $element_style ) {
				if (
					empty( $element_style ) ||
					! is_array( $element_style ) ||
					empty( $element_selectors[ $element_name ] )
				) {
					continue;
				}

$element_pseudo_states = WP_Theme_JSON::VALID_ELEMENT_PSEUDO_SELECTORS[ $element_name ]
					?? array();
				$root_element_style    = wp_get_root_state_style(
					$element_style,
					$element_pseudo_states
				);

wp_add_block_state_style_rule(
					$css_rules,
					'',
					$element_selectors[ $element_name ],
					$root_element_style,
					$media_query
				);

foreach ( $element_pseudo_states as $pseudo_state ) {
					if (
						empty( $element_style[ $pseudo_state ] ) ||
						! is_array( $element_style[ $pseudo_state ] )
					) {
						continue;
					}

wp_add_block_state_style_rule(
						$css_rules,
						$pseudo_state,
						$element_selectors[ $element_name ],
						$element_style[ $pseudo_state ],
						$media_query
					);
				}
			}
		}

foreach ( $supported_pseudo_states as $pseudo_state ) {
			if ( empty( $style[ $breakpoint ][ $pseudo_state ] ) || ! is_array( $style[ $breakpoint ][ $pseudo_state ] ) ) {
				continue;
			}

$css_rules = array_merge(
				$css_rules,
				wp_get_block_state_style_rules(
					array( $pseudo_state => $style[ $breakpoint ][ $pseudo_state ] ),
					$block_type,
					$media_query
				)
			);
		}
	}

if ( empty( $css_rules ) ) {
		return $block_content;
	}

$unique_class = wp_get_block_state_unique_class( $block_name, $css_rules );

/*
	 * Register each state's CSS rules with the block-supports style engine store.
	 * The store deduplicates rules by selector — two block instances with identical
	 * state styles share the same hash class and therefore the same selector,
	 * so only one CSS rule is emitted. The store is flushed to the page by
	 * wp_enqueue_stored_styles() rather than injected inline here.
	 *
	 * State declarations need !important to apply reliably over inline styles and
	 * preset utility classes such as .has-accent-3-background-color.
	 *
	 * Layout-driven state styles (responsive layout, blockGap, child layout) are
	 * handled by wp_render_layout_support_flag() so they share a selector with
	 * the base layout and target the correct (inner) wrapper element.
	 */
	$style_rules = array();
	foreach ( $css_rules as $rule ) {
		$declarations                 = $rule['declarations'];
		$important_declaration_values = wp_get_state_declarations_with_background_resets( $declarations );
		$important_declarations       = new WP_Style_Engine_CSS_Declarations();
		foreach ( $important_declaration_values as $property => $value ) {
			$important_declarations->add_declaration(
				$property,
				$value,
				array(
					'important' => true,
				)
			);
		}
		$selector             = wp_build_state_selector(
			".$unique_class",
			$rule['selector'],
			$rule['state']
		);
		$important_style_rule = array(
			'selector'     => $selector,
			'declarations' => $important_declarations,
		);
		if ( ! empty( $rule['rules_group'] ) ) {
			$important_style_rule['rules_group'] = $rule['rules_group'];
		}
		$style_rules[] = $important_style_rule;

$fallback_declarations = wp_get_state_declarations_with_fallback_border_styles( $declarations );
		foreach ( array_keys( $declarations ) as $property ) {
			unset( $fallback_declarations[ $property ] );
		}

if ( empty( $fallback_declarations ) ) {
			continue;
		}

$fallback_style_rule = array(
			'selector'     => $selector,
			'declarations' => $fallback_declarations,
		);
		if ( ! empty( $rule['rules_group'] ) ) {
			$fallback_style_rule['rules_group'] = $rule['rules_group'];
		}
		$style_rules[] = $fallback_style_rule;
	}

wp_style_engine_get_stylesheet_from_css_rules(
		$style_rules,
		array(
			'context'  => 'block-supports',
			'prettify' => false,
		)
	);

$processor = new WP_HTML_Tag_Processor( $block_content );
	if ( $processor->next_tag() ) {
		$processor->add_class( $unique_class );
	}
	return $processor->get_updated_html();
}
add_filter( 'render_block', 'wp_render_block_states_support', 10, 2 );

Editing: states.php

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