Returns color classnames depending on whether there are named or custom text and background colors.

function get_color_classes_for_block_core_search( $attributes ) {
	$classnames = array();

	// Text color.
	$has_named_text_color  = ! empty( $attributes['textColor'] );
	$has_custom_text_color = ! empty( $attributes['style']['color']['text'] );
	if ( $has_named_text_color ) {
		$classnames[] = sprintf( 'has-text-color has-%s-color', $attributes['textColor'] );
	} elseif ( $has_custom_text_color ) {
		// If a custom 'textColor' was selected instead of a preset, still add the generic `has-text-color` class.
		$classnames[] = 'has-text-color';
	}

	// Background color.
	$has_named_background_color  = ! empty( $attributes['backgroundColor'] );
	$has_custom_background_color = ! empty( $attributes['style']['color']['background'] );
	$has_named_gradient          = ! empty( $attributes['gradient'] );
	$has_custom_gradient         = ! empty( $attributes['style']['color']['gradient'] );
	if (
		$has_named_background_color ||
		$has_custom_background_color ||
		$has_named_gradient ||
		$has_custom_gradient
	) {
		$classnames[] = 'has-background';
	}
	if ( $has_named_background_color ) {
		$classnames[] = sprintf( 'has-%s-background-color', $attributes['backgroundColor'] );
	}
	if ( $has_named_gradient ) {
		$classnames[] = sprintf( 'has-%s-gradient-background', $attributes['gradient'] );
	}

	return implode( ' ', $classnames );
}