<?php

/**

 * Border block support flag.

 *

 * @package WordPress

 * @since 5.8.0

 */

/**

 * Registers the style attribute used by the border feature if needed for block

 * types that support borders.

 *

 * @since 5.8.0

 * @access private

 *

 * @param WP_Block_Type $block_type Block Type.

 */

function wp_register_border_support( $block_type ) {

	// Setup attributes and styles within that if needed.

	if ( ! $block_type->attributes ) {

		$block_type->attributes = array();

	}

		$block_type->attributes['style'] = array(

			'type' => 'object',

		);

	}

		$block_type->attributes['borderColor'] = array(

			'type' => 'string',

		);

	}

}

/**

 * Adds CSS classes and inline styles for border styles to the incoming

 * attributes array. This will be applied to the block markup in the front-end.

 *

 * @since 5.8.0

 * @access private

 *

 * @param WP_Block_Type $block_type       Block type.

 * @param array         $block_attributes Block attributes.

 * @return array Border CSS classes and inline styles.

 */

function wp_apply_border_support( $block_type, $block_attributes ) {

	if ( wp_should_skip_block_supports_serialization( $block_type, 'border' ) ) {

		return array();

	}

	// Border radius.

	if (

		wp_has_border_feature_support( $block_type, 'radius' ) &&

		isset( $block_attributes['style']['border']['radius'] ) &&

		! wp_should_skip_block_supports_serialization( $block_type, '__experimentalBorder', 'radius' )

	) {

		$border_radius = $block_attributes['style']['border']['radius'];

	}

	// Border style.

	if (

		wp_has_border_feature_support( $block_type, 'style' ) &&

		isset( $block_attributes['style']['border']['style'] ) &&

		! wp_should_skip_block_supports_serialization( $block_type, '__experimentalBorder', 'style' )

	) {

	}

	// Border width.

	if (

		isset( $block_attributes['style']['border']['width'] ) &&

		! wp_should_skip_block_supports_serialization( $block_type, '__experimentalBorder', 'width' )

	) {

		$border_width = $block_attributes['style']['border']['width'];

		// This check handles original unitless implementation.

		if ( is_numeric( $border_width ) ) {

			$border_width .= 'px';

		}

	}

	// Border color.

	if (

		! wp_should_skip_block_supports_serialization( $block_type, '__experimentalBorder', 'color' )

	) {

		}

	}

	// Collect classes and styles.

	$attributes = array();

	}

	}

	return $attributes;

}

/**

 * Checks whether the current block type supports the border feature requested.

 *

 * If the `__experimentalBorder` support flag is a boolean `true` all border

 * support features are available. Otherwise, the specific feature's support

 * flag nested under `experimentalBorder` must be enabled for the feature

 * to be opted into.

 *

 * @since 5.8.0

 * @access private

 *

 * @param WP_Block_Type $block_type    Block type to check for support.

 * @param string        $feature       Name of the feature to check support for.

 * @param mixed         $default_value Fallback value for feature support, defaults to false.

 * @return bool Whether the feature is supported.

 */

function wp_has_border_feature_support( $block_type, $feature, $default_value = false ) {

	// Check if all border support features have been opted into via `"__experimentalBorder": true`.

	}

	// Check if the specific feature has been opted into individually

	// via nested flag under `__experimentalBorder`.

	return block_has_support( $block_type, array( '__experimentalBorder', $feature ), $default_value );

}

// Register the block support.

WP_Block_Supports::get_instance()->register(

	'border',

	array(

		'register_attribute' => 'wp_register_border_support',

		'apply'              => 'wp_apply_border_support',

	)

);