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Block Styles: Fix block style variation selector generation #58051

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merged 8 commits into from
Jan 30, 2024

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aaronrobertshaw
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What?

Updates the approach to generating selectors for block style variations so that they aren't broken if a block's selector happens to be an element tag such as the paragraph block.

Why?

With the current approach just pretending is-style-whatever to the block's selector we end up with a broken selector for the paragraph block. As block style variations are being extended to support section styling it is highly likely theme authors and users might want to have some different styles within paragraphs on a per section basis.

How?

  • Creates a new function to add the block style variation's class to the block's current selector.
  • Adds some unit tests to cover most use cases

Testing Instructions

  1. Check npm run test:unit:php:base -- --filter WP_Theme_JSON_Gutenberg_Test is all green
  2. Confirm block styles in the editor still work

@aaronrobertshaw aaronrobertshaw added [Type] Bug An existing feature does not function as intended Global Styles Anything related to the broader Global Styles efforts, including Styles Engine and theme.json labels Jan 22, 2024
@aaronrobertshaw aaronrobertshaw self-assigned this Jan 22, 2024
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This pull request has changed or added PHP files. Please confirm whether these changes need to be synced to WordPress Core, and therefore featured in the next release of WordPress.

If so, it is recommended to create a new Trac ticket and submit a pull request to the WordPress Core Github repository soon after this pull request is merged.

If you're unsure, you can always ask for help in the #core-editor channel in WordPress Slack.

Thank you! ❤️

View changed files
❔ lib/class-wp-theme-json-gutenberg.php
❔ phpunit/class-wp-theme-json-test.php

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@andrewserong andrewserong left a comment

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Thanks for the ping @aaronrobertshaw! Just to make sure I'm following — the problem with the current approach on trunk is that anything that uses an element selector will be broken because it currently prepends the variation classname instead of appending, so we wind up getting .is-style-customp instead of p.is-style-custom.

Attempting to ensure that we're always adding the classname after the wrapping selector sounds like a good idea to me 👍. It's a bit tricky to predict, but I like the way you're honing in on what would be the valid characters before the bit we wish to inject.

Just left a few questions — my regex is a little rusty, so I copy / pasted it into https://regexr.com/ to play with some sample values, and I wasn't sure how much of the is|not|has|where we needed?

Also, it looks like we'll also need to update the JS logic for consistency. While manually testing, I noticed that the paragraph styles are output correctly for me in the post editor (which uses this PHP logic) but not in the site editor.

Post editor

The selector is correct:

image

Site editor

This block is set to my is-style-custom style, but doesn't get the color:

image

Here's the output in the site editor:

image

To reproduce:

  • I added the following at the end of the paragraph block's block.json:
	"styles": [
		{ "name": "fill", "label": "Fill", "isDefault": true },
		{ "name": "outline", "label": "Outline" },
		{ "name": "custom", "label": "Custom" }
	]
  • Opened up the site editor, went to the Paragraph block in global styles, edited the Custom block style and gave it a color.
  • Added a paragraph block and selected the Custom style.

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github-actions bot commented Jan 22, 2024

Flaky tests detected in 327d1ee.
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/7690849477
📝 Reported issues:

@aaronrobertshaw
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I've quickly updated the JS side of block style variation selectors but am out of time today. I'll give this a proper test tomorrow before flagging it ready for a final review.

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github-actions bot commented Jan 22, 2024

Size Change: +64 B (0%)

Total Size: 1.7 MB

Filename Size Change
build/block-editor/index.min.js 250 kB +64 B (0%)
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@aaronrobertshaw aaronrobertshaw force-pushed the fix/block-style-variation-selectors branch from 026207d to 3c7a5c1 Compare January 25, 2024 04:11
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aaronrobertshaw commented Jan 25, 2024

I think this is ready for a final review. I fixed the expected selector in the JS unit tests I missed.

The rest of the earlier unit test failures seemed unrelated but I've rebased this in case. FWIW the tests are passing locally.

I also gave this PR another manual test in the browser and it behaves as expected.

@andrewserong
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Thanks for the update, Aaron! I likely won't get time to take this for another spin today, but if no-one beats me to it, I'll give this another review on Monday 🙂

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Just managed to get this review in before wrapping up for the week. This is testing great for me now!

✅ Adding additional styles to the paragraph block as in my earlier review is now working nicely
✅ Paragraph and Button outline style updates are working well in the site editor, post editor, and on the site front end
✅ Regex pattern looks good to me, thanks for adding in the good test coverage for both the JS and PHP approaches!

image

While it's good to avoid complex regex patterns where we can, in this instance I think parsing the CSS selector with these regex patterns is nicely justified:

  • The custom selector is only set by blocks, so is unlikely to be super complex selectors and is relatively controlled
  • Due to the above, we're not parsing user entered data
  • We're not attempting to parse all of the CSS spec or anything like that

So, all up I think this is a good approach to go with — it resolves the current bug while making the feature more robust and adding some good test coverage.

LGTM! ✨

@aaronrobertshaw aaronrobertshaw force-pushed the fix/block-style-variation-selectors branch from dfedef0 to 327d1ee Compare January 29, 2024 03:37
@aaronrobertshaw aaronrobertshaw force-pushed the fix/block-style-variation-selectors branch from 327d1ee to f7f6b1a Compare January 30, 2024 01:15
@aaronrobertshaw aaronrobertshaw merged commit 8895a51 into trunk Jan 30, 2024
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@aaronrobertshaw aaronrobertshaw deleted the fix/block-style-variation-selectors branch January 30, 2024 02:31
@github-actions github-actions bot added this to the Gutenberg 17.7 milestone Jan 30, 2024
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Backport is available in WordPress/wordpress-develop#6053

@aaronrobertshaw aaronrobertshaw added the Needs PHP backport Needs PHP backport to Core label Feb 7, 2024
@youknowriad youknowriad added Backported to WP Core Pull request that has been successfully merged into WP Core and removed Needs PHP backport Needs PHP backport to Core labels Feb 8, 2024
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3 participants