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Block API: Convert block alias into canonical block (PoC) #61481

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@tjcafferkey tjcafferkey commented May 8, 2024

wordpress-develop counterpart: WordPress/wordpress-develop#6523

To do (that are known):

  • Alias blocks to have an additional class name.
  • Revisit code, especially around registration (linked PR).
  • Test coverage.

Related to: #43743

What?

Why?

How?

Testing Instructions

  1. Add the "Register variant" code to register a variant of the core/separator block with a new alias of block-variant/separartor-variant.
  2. Add the "Add variant to template" code to one of your block templates or add the "Variant Separator" via the inserter & Save template
  3. Add the "Hook block" code to your site
  4. Refresh template & reload on frontend to see hooked block

Register variant

function register_block_alias_block_variation( $variations, $block_type) {
	if ( 'core/separator' !== $block_type->name ) {
		return $variations;
	}

	$variations[] = array(
		'title' => 'Separator Variant',
		'name' => 'block-alias/separator-variant',
		'supports' => array(
			'alias' => true,
		),
	);

	return $variations;
}

add_filter('get_block_type_variations', 'register_block_alias_block_variation', 10, 2);

Hook block

function register_hooked_block( $hooked_block_types, $relative_position, $anchor_block_type, $context ) {
	if ( 'block-alias/separator-variant' === $anchor_block_type && 'after' === $relative_position ) {
		$hooked_block_types[] = 'core/loginout';
	}

	return $hooked_block_types;
}

add_filter( 'hooked_block_types', 'register_hooked_block', 10, 4 );

Add variant to template

<!-- wp:block-alias/separator-variant {"metadata":{"alias":"core/separator"},"className":"wp-block-block-alias-separator-variant"} -->
<hr class="wp-block-separator has-alpha-channel-opacity"/>
<!-- /wp:block-alias/separator-variant -->

Testing Instructions for Keyboard

Screenshots or screencast

@tjcafferkey tjcafferkey changed the title Block API: Convert block alias into canonical block Block API: Convert block alias into canonical block (PoC) May 8, 2024
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github-actions bot commented May 8, 2024

Size Change: +53 B (0%)

Total Size: 1.74 MB

Filename Size Change
build/blocks/index.min.js 51.7 kB +53 B (+0.1%)
ℹ️ View Unchanged
Filename Size
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@tjcafferkey tjcafferkey self-assigned this May 8, 2024
@tjcafferkey tjcafferkey added [Feature] Block API API that allows to express the block paradigm. [Status] In Progress Tracking issues with work in progress labels May 8, 2024
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...item.initialAttributes,
...variation.attributes,
...( supportsAlias && {
className: getBlockDefaultClassName( variation.name ),
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Maybe it would be better to move this to what generates the markup rather than a pre-set attribute?

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Potential problem with this is block validation

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Additional custom class names are ignored during validations, so that should be good. That's also a design question whether we want to have two class names printed:

  • computed from the original block type
  • computer from the alias for the block variation

@gziolo
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gziolo commented May 8, 2024

This looks very promising. Noting that it would potentially address #43743.

@ockham
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ockham commented May 13, 2024

@tjcafferkey and I just had a call where he walked me through this PR and WordPress/wordpress-develop#6523. Thanks Tom! This is looking very promising 😊

I'll need a bit more time to fully catch up, but as a quick brain dump, I was wondering if we could integrate the aliases a bit more tightly with the existing concept of block variations (and potentially avoid setting a metadata.alias attribute on the client side). Recall the example from the PR description:

<!-- wp:block-alias/separator-variant {"metadata":{"alias":"core/separator"},"className":"wp-block-block-alias-separator-variant"} -->
<hr class="wp-block-separator has-alpha-channel-opacity"/>
<!-- /wp:block-alias/separator-variant -->

The way I'm thinking about this is largely as follows: The existing concept of block variations works based on attributes. My go-to example is Core's Social Link block.

image

The markup for the above example is as follows:

<!-- wp:social-links -->
<ul class="wp-block-social-links">
<!-- wp:social-link {"url":"wordpress.org","service":"wordpress"} /-->
<!-- wp:social-link {"url":"tumblr.com","service":"tumblr"} /-->
</ul>
<!-- /wp:social-links -->

Note that the editor distinguishes variations of this block (as evidenced by the different icons it uses) based on their service attribute.

Per the code in this PR, if we were to introduce aliases for our block as its author, we would need to add code to set metadata.alias when an instance of a given block variation is inserted, e.g. "metadata":{"alias":"core/social-icon/wordpress"}.

However, this puts an extra burden on block authors, and it feels a bit redundant, since there's a 1:1 mapping from the "distinguishing" attribute (service) to the variation.

AFAICS, the existing client-side registration API already contains all the information we need:

wp.blocks.registerBlockVariation(
    'core/embed',
    {
        name: 'custom-embed',
        attributes: { providerNameSlug: 'custom' },
    }
);

So I think it should be possible to rewrite the client-side transforms to use information gathered from whatever registry is used for registerBlockVariation. (I'll probably create a copy of this branch to try this as a first step.)

This might still leave us with the problem of how to handle the server side. I think that we can treat that as a separate problem, and potentially tackle it in a similar way that block registration has evolved over time: Separate mechanisms on the client and server that were eventually bridged by a somewhat shared JSON format (i.e. block.json, in that case).

@ockham
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ockham commented May 14, 2024

I talked with @gziolo today, and he pointed out one reason why we might actually want to store the reference to the canonical block explicitly: If a plugin defines a block variation, and we start persisting that block in our markup using that variation's alias, then it'd be good to preserve the information what the underlying block is in case that plugin is disabled.

E.g. let's say there's a Custom Gallery plugin that ships a cg/custom-gallery block variation which is based on the core/gallery block, and the user saves that Custom Gallery block in a post or template, the markup will be something like

<!-- wp:cg/custom-gallery {"someAttribute":"value",...} /-->

Now if that plugin is disabled, any code that would include the mapping from alias to attribute value is no longer available, and as a result, WP won't know any longer what to show in the editor.

If OTOH the canonical block name is preserved in the markup, WP can degrade more gracefully by replacing

<!-- wp:cg/custom-gallery {"metadata":{"canonical":"core/gallery"},"someAttribute":"value",...} /-->

by

<!-- wp:gallery {"someAttribute":"value",...} /-->

In practice, I'm not yet 100% how compelling a reason this is for storing the reference to the canonical name in the markup. While it's nice to degrade gracefully, one could argue that

  1. It's somewhat expected to lose some functionality that comes with a plugin if the latter is disabled. E.g. if a plugin contains a full-fledged block that's used in markup, that block won't properly render anymore in the editor either if the plugin is disabled (and might not on the frontend either, especially if it's a dynamic block).
  2. Unless I'm mistaken, block variations only seem to allow for fairly light-weight customizations -- essentially just setting some attribute(s) on an existing block (but e.g. no custom code for that variation). The use case we're looking at is where a plugin includes the variation but not the underlying ("canonical") block. I'm not sure how much of a compelling use case it is for plugin authors to ship "only" a variation of an existing block.

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