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Extract the getSupportedStyles selector to the blocks store as a private selector #47606

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merged 5 commits into from
Feb 3, 2023

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youknowriad
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Extracted from #47356

What?

This is a small refactoring that extracts the getSupportedStyles function as a private selector into the blocks store.

Why?

In #47356, we moved the getSupportedGlobalStylesPanels function to the block-editor package but in reality it's better suited for the blocks package because it only needs the block registration.

Also, I'd like to use this function in a follow-up to build a "theme.json" like settings object based on a blockName, selector pair using this function as a starting point.

See related discussion #47356 (comment) and #47356 (comment)

Testing Instructions

1- Open the global styles UI (especially typography)
2- Ensure that they show the exact same panels as in trunk.

I've also added some unit tests to this function.

@youknowriad youknowriad added the [Type] Code Quality Issues or PRs that relate to code quality label Jan 31, 2023
@youknowriad youknowriad self-assigned this Jan 31, 2023
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Size Change: +1.6 kB (0%)

Total Size: 1.31 MB

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github-actions bot commented Jan 31, 2023

Flaky tests detected in 81c1807.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/4082324020
📝 Reported issues:

@youknowriad
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The failing unit test is a bit weird here, I think it's somehow related to "mocking" and "private selectors in store". For some reason the mocking is not working properly. Can you help @adamziel ?

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@youknowriad packages/blocks/src/api/raw-handling/utils.js mocks @wordpress/data including createReduxStore which means registerPrivateActions never gets locked in the store object. We'd either need to recreate the locking logic in the mocked function, or call the real createReduxStore. Do you know why are these mocks needed? Creating a real non-mocked registry is a part of many tests - maybe we could do the same here?

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Nice! I like the hooks and that you added unit tests.

It seems to me that getSupportedStyles is two functions smooshed together:

(1) If name is provided then it looks up what styles are supported via getBlockType( name ).supports.

(2) If element is provided then it computes what styles are supported using ROOT_BLOCK_SUPPORTS and some custom logic.

Do you think it would be easier to reason about if we split them apart?

So have wp.data.select( 'core/blocks' ).getSupportedStyles( name ) which does (1) and then maybe wp.blockEditor.getSupportedStyles( element ) which does (2).

Then wp-blocks doesn't have to know what an "element" is which doesn't really feel right to me.

Lmkwyt. I might be misunderstanding something!

}
} );

return filterElementBlockSupports( supportKeys, name, element );
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Calling filterElementBlockSupports here should have no effect, right? Because we know that name is truthy and all but one of the branches in filterElementBlockSupports contain a ! name check meaning they won't execute. The one exception is the support === 'fontSize' && element === 'heading' branch but I think that might never execute here either because otherwise there wouldn't be a Font size control in Styles → Blocks → Heading → Typography.

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youknowriad commented Feb 1, 2023

It's not easy to split this PR like you suggested because there's some logic that needs to know both at the same time. Like links have this particular style only in root or something like that.

I think as it stands, element only impacts "root" but for me, this is just a temporary thing. In other words, when we added this logic, we only thought about the root use case but It doesn't seem crazy for me that we'd add "supports" for elements as well and have some logic like blockSupports && elementSupports

also note that root block supports also make sense even without passing an "element".

I'm hesitant here.

@youknowriad youknowriad force-pushed the update/extracted-get-supported-styles branch from 52d4e32 to bd27573 Compare February 1, 2023 08:44
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Thanks @adamziel I've managed to remove the mocking.

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youknowriad commented Feb 1, 2023

After thinking about it, it's about getting the supported styles for a couple (element, blockName) when both of these arguments are nullable. In other words, while getting supports for an element make sense on its own, getting the supports for a block also make sense, what this function is about is the combination of both.

It's also a private selector so we can adapt.

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LGTM 👍 Things worked as expected.

'letterSpacing',
];

function filterElementBlockSupports( blockSuppots, name, element ) {
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Could we include some minor docs for this function?


function filterElementBlockSupports( blockSuppots, name, element ) {
return blockSuppots.filter( ( support ) => {
if ( support === 'fontSize' && element === 'heading' ) {
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It would be nice to somehow encode these rules in a declarative approach as a JavaScript object. But unfortunately, that is not simple to do.

STYLE_PROPERTY[ styleName ].support
) !== false
) {
return supportKeys.push( styleName );
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nitpick: given that a forEach does not returns, I would do:

supportKeys.push( styleName );
return;

To make it clear we are in a function that does not return.

blockType.supports &&
get(
blockType.supports,
STYLE_PROPERTY[ styleName ].support
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Do we need this logic STYLE_PROPERTY[ styleName ].support[ 0 ] in blockType.supports ? Could we simply get(blockType.supports, STYLE_PROPERTY[ styleName ].support ) !== false without that part?

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To be honest I'm not entirely sure, this was just copied as is.

@youknowriad youknowriad enabled auto-merge (squash) February 3, 2023 08:17
@youknowriad youknowriad merged commit ddcaa70 into trunk Feb 3, 2023
@youknowriad youknowriad deleted the update/extracted-get-supported-styles branch February 3, 2023 17:50
@github-actions github-actions bot added this to the Gutenberg 15.2 milestone Feb 3, 2023
@DaisyOlsen DaisyOlsen added [Package] Editor /packages/editor Global Styles Anything related to the broader Global Styles efforts, including Styles Engine and theme.json and removed [Package] Editor /packages/editor labels Feb 14, 2023
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5 participants