JiveDig/functions.php

## functions.php
<?php

/**
 * Dump the data.
 */
add_action( 'wp_footer', function() {
	// Get the data.
	$parsed = jivedig_get_parsed_blocks_for_template();

	// Dump however you'd like.
	var_dump( $parsed );
});

/**
 * Gets parsed blocks for `template` parameter of `register_post_type()`.
 *
 * @version 1.0.0
 *
 * @return array
 */
function jivedig_get_parsed_blocks_for_template() {
	global $post;
	$blocks = parse_blocks( $post->post_content );
	$blocks = jivedig_parse_blocks_for_template( $blocks );

	return $blocks;
}

/**
 * Parses blocks to be used in the `template` parameter of `register_post_type()`.
 *
 * @version 1.0.0
 *
 * @param array $blocks The blocks array from `parse_blocks()` function.
 *
 * @return array
 */
function jivedig_parse_blocks_for_template( $blocks ) {
	$parsed = [];

	if ( ! $blocks ) {
		return $parsed;
	}

	foreach ( $blocks as $key => $values ) {
		$name  = $values['blockName'];
		$atts  = $values['attrs'];
		$inner = isset( $values['innerBlocks'] ) ? jivedig_parse_blocks_for_template( $values['innerBlocks'] ) : [];

		// Bail if not block.
		if ( is_null( $name ) ) {
			continue;
		}

		// Set default content.
		if ( in_array( $name, [ 'core/heading', 'core/paragraph' ] ) && isset( $values['innerHTML'] ) && $values['innerHTML'] ) {
			$atts['content'] = jivedig_get_first_child_inner_html( $values['innerHTML'] );
		}

		// Lock all blocks.
		$atts['template_lock'] = [
			'move'   => in_array( $name, [ 'core/paragraph' ] ),
			'remove' => in_array( $name, [ 'core/paragraph' ] ),
		];

		// If ACF block.
		if ( isset( $atts['data'] ) ) {
			// Temp store data.
			$data = $atts['data'];

			// Remove unused attributes from ACF.
			unset( $atts['data'] );
			unset( $atts['id'] );
			unset( $atts['name'] );

			// Remove _field key references from ACF.
			foreach ( $data as $data_key => $data_value ) {
				if ( ! ( is_string( $data_key ) && str_starts_with( $data_key, '_' ) ) ) {
					continue;
				}

				unset( $data[ $data_key ] );
			}

			// Merge with existing atts.
			$atts = array_merge( $atts, $data );
		}

		$parsed[] = [ $name, $atts, $inner ];
	}

	return $parsed;
}

/**
 * Gets a DOMDocument first child element.
 *
 * @version 1.0.0
 *
 * @param string $html Any given HTML string.
 *
 * @return DOMElement $first_block The group block container.
 */
function jivedig_get_first_child_inner_html( $html ) {
	$dom   = jivedig_get_dom_document( $html );
	$first = $dom->childNodes->item(0);
	$inner = $first ? $first->childNodes->item(0) : '';

	return $inner ? $inner->ownerDocument->saveHTML( $inner ) : '';
}

/**
 * Gets DOMDocument object.
 *
 * @version 1.0.0
 *
 * @param string $html Any given HTML string.
 *
 * @return DOMDocument
 */
function jivedig_get_dom_document( $html ) {
	// Create the new document.
	$dom = new DOMDocument();

	// Modify state.
	$libxml_previous_state = libxml_use_internal_errors( true );

	// Load the content in the document HTML.
	$dom->loadHTML( mb_convert_encoding( $html, 'HTML-ENTITIES', 'UTF-8' ) );

	// Remove <!DOCTYPE.
	$dom->removeChild( $dom->doctype );

	// Remove <html><body></body></html>.
	$dom->replaceChild( $dom->firstChild->firstChild->firstChild, $dom->firstChild );

	// Handle errors.
	libxml_clear_errors();

	// Restore.
	libxml_use_internal_errors( $libxml_previous_state );

	return $dom;
}

/**
 * PHP 8 polyfill for older versions of PHP.
 *
 * @source Laravel Framework
 * @link   https://github.com/laravel/framework/blob/8.x/src/Illuminate/Support/Str.php
 */
if ( ! function_exists( 'str_starts_with' ) ) {
	function str_starts_with( $haystack, $needle ) {
		return (string) $needle !== '' && strncmp( $haystack, $needle, strlen( $needle ) ) === 0;
	}
}

## register-post-type.php
<?php

/**
 * Register custom post type.
 *
 * @return void
 */
add_action( 'init', function() {

	register_post_type( 'thing',
		[
			// Other
			// attributes
			// here.

			'template' => [
				[
					'core/group',
					[
						'align'                 => 'full',
						'contentWidth'          => 'xl',
						'contentAlign'          => 'center',
						'verticalSpacingTop'    => 'lg',
						'verticalSpacingBottom' => 'lg',
						'backgroundColor'       => 'alt',
						'template_lock'         => [
							'move'   => false,
							'remove' => false,
						],
					],
					[
						[
							'core/heading',
							[
								'content'       => 'Descriptive heading',
								'template_lock' => [
									'move'   => false,
									'remove' => false,
								],
							],
							[],
						],
						[
							'core/paragraph',
							[
								'className'     => 'is-style-heading',
								'content'       => 'Default text',
								'template_lock' => [
									'move'   => true,
									'remove' => true,
								],
							],
							[],
						],
					],
				]
			],
		]
	);
});
	<?php

	/**
	* Dump the data.
	*/
	add_action( 'wp_footer', function() {
	// Get the data.
	$parsed = jivedig_get_parsed_blocks_for_template();

	// Dump however you'd like.
	var_dump( $parsed );
	});

	/**
	* Gets parsed blocks for `template` parameter of `register_post_type()`.
	*
	* @version 1.0.0
	*
	* @return array
	*/
	function jivedig_get_parsed_blocks_for_template() {
	global $post;
	$blocks = parse_blocks( $post->post_content );
	$blocks = jivedig_parse_blocks_for_template( $blocks );

	return $blocks;
	}

	/**
	* Parses blocks to be used in the `template` parameter of `register_post_type()`.
	*
	* @version 1.0.0
	*
	* @param array $blocks The blocks array from `parse_blocks()` function.
	*
	* @return array
	*/
	function jivedig_parse_blocks_for_template( $blocks ) {
	$parsed = [];

	if ( ! $blocks ) {
	return $parsed;
	}

	foreach ( $blocks as $key => $values ) {
	$name = $values['blockName'];
	$atts = $values['attrs'];
	$inner = isset( $values['innerBlocks'] ) ? jivedig_parse_blocks_for_template( $values['innerBlocks'] ) : [];

	// Bail if not block.
	if ( is_null( $name ) ) {
	continue;
	}

	// Set default content.
	if ( in_array( $name, [ 'core/heading', 'core/paragraph' ] ) && isset( $values['innerHTML'] ) && $values['innerHTML'] ) {
	$atts['content'] = jivedig_get_first_child_inner_html( $values['innerHTML'] );
	}

	// Lock all blocks.
	$atts['template_lock'] = [
	'move' => in_array( $name, [ 'core/paragraph' ] ),
	'remove' => in_array( $name, [ 'core/paragraph' ] ),
	];

	// If ACF block.
	if ( isset( $atts['data'] ) ) {
	// Temp store data.
	$data = $atts['data'];

	// Remove unused attributes from ACF.
	unset( $atts['data'] );
	unset( $atts['id'] );
	unset( $atts['name'] );

	// Remove _field key references from ACF.
	foreach ( $data as $data_key => $data_value ) {
	if ( ! ( is_string( $data_key ) && str_starts_with( $data_key, '_' ) ) ) {
	continue;
	}

	unset( $data[ $data_key ] );
	}

	// Merge with existing atts.
	$atts = array_merge( $atts, $data );
	}

	$parsed[] = [ $name, $atts, $inner ];
	}

	return $parsed;
	}

	/**
	* Gets a DOMDocument first child element.
	*
	* @version 1.0.0
	*
	* @param string $html Any given HTML string.
	*
	* @return DOMElement $first_block The group block container.
	*/
	function jivedig_get_first_child_inner_html( $html ) {
	$dom = jivedig_get_dom_document( $html );
	$first = $dom->childNodes->item(0);
	$inner = $first ? $first->childNodes->item(0) : '';

	return $inner ? $inner->ownerDocument->saveHTML( $inner ) : '';
	}

	/**
	* Gets DOMDocument object.
	*
	* @version 1.0.0
	*
	* @param string $html Any given HTML string.
	*
	* @return DOMDocument
	*/
	function jivedig_get_dom_document( $html ) {
	// Create the new document.
	$dom = new DOMDocument();

	// Modify state.
	$libxml_previous_state = libxml_use_internal_errors( true );

	// Load the content in the document HTML.
	$dom->loadHTML( mb_convert_encoding( $html, 'HTML-ENTITIES', 'UTF-8' ) );

	// Remove <!DOCTYPE.
	$dom->removeChild( $dom->doctype );

	// Remove <html><body></body></html>.
	$dom->replaceChild( $dom->firstChild->firstChild->firstChild, $dom->firstChild );

	// Handle errors.
	libxml_clear_errors();

	// Restore.
	libxml_use_internal_errors( $libxml_previous_state );

	return $dom;
	}

	/**
	* PHP 8 polyfill for older versions of PHP.
	*
	* @source Laravel Framework
	* @link https://github.com/laravel/framework/blob/8.x/src/Illuminate/Support/Str.php
	*/
	if ( ! function_exists( 'str_starts_with' ) ) {
	function str_starts_with( $haystack, $needle ) {
	return (string) $needle !== '' && strncmp( $haystack, $needle, strlen( $needle ) ) === 0;
	}
	}
	<?php

	/**
	* Register custom post type.
	*
	* @return void
	*/
	add_action( 'init', function() {

	register_post_type( 'thing',
	[
	// Other
	// attributes
	// here.

	'template' => [
	[
	'core/group',
	[
	'align' => 'full',
	'contentWidth' => 'xl',
	'contentAlign' => 'center',
	'verticalSpacingTop' => 'lg',
	'verticalSpacingBottom' => 'lg',
	'backgroundColor' => 'alt',
	'template_lock' => [
	'move' => false,
	'remove' => false,
	],
	],
	[
	[
	'core/heading',
	[
	'content' => 'Descriptive heading',
	'template_lock' => [
	'move' => false,
	'remove' => false,
	],
	],
	[],
	],
	[
	'core/paragraph',
	[
	'className' => 'is-style-heading',
	'content' => 'Default text',
	'template_lock' => [
	'move' => true,
	'remove' => true,
	],
	],
	[],
	],
	],
	]
	],
	]
	);
	});