Style engine: support nested CSS rules (or CSS containers) #58797
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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❔ phpunit/style-engine/class-wp-style-engine-css-rules-container-test.php ❔ lib/load.php ❔ phpunit/style-engine/class-wp-style-engine-css-rules-store-test.php ❔ phpunit/style-engine/class-wp-style-engine-processor-test.php ❔ phpunit/style-engine/style-engine-test.php |
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# Clean up after rebase Clean up after rebase
Ensuring we can add rule objects to store Tests new container class
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ramonjd
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Feb 10, 2024
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Still testing.
Does "container" make sense? It can apply to CSS nesting, at-rules etc
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| /** | ||
| * Holds, sanitizes, processes and prints CSS declarations for the Style Engine. | ||
| * Holds, sanitizes, processes and prints CSS rules for the Style Engine. |
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Aside from this copy update, these changes just revert those in #58867
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New class with a similar interface to WP_Style_Engine_CSS_Rule
This is intentional so that the relevant getter class methods such as get_css/selector can be called where there is a collection of rules + nested rules, e.g., in a single store.
Also so WP_Style_Engine_CSS_Rule doesn't need to care about whether its nested or not, which is the same as the declarations class, and can take care of its own output.
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TODO - WP_Style_Engine_CSS_Rules_Container should extend WP_Style_Engine_CSS_Rule, or even look into adding WP_Style_Engine_CSS_Rules_Container methods to WP_Style_Engine_CSS_Rule itself.
I'd say the former to maintain separation of concerns.
Reason being, with nested CSS, the container rule should also be able to have declarations.
This can be handled by the existing API, indicated by passing a container and not a selector:
wp_style_engine_get_stylesheet_from_css_rules(
array(
'container' => 'fieldset',
'declarations' => array( .... )
),
array(
'container' => 'fieldset',
'container' => 'textarea',
'declarations' => array( .... )
)
)
/*
Output:
fieldset {
...declarations;
textarea {
...declarations;
}
}
*/
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I can't seem to unit test this using $this->expectNotice();
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Bumps the indent count for nested rules
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If the selector is a string create a CSS_Rule. This is legacy behaviour. Containers should be passed as already instantiated.
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[Type] New API
Store combines existing rules Store combines
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Flaky tests detected in 1737f72. 🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/7860556773
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ramonjd
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Feb 11, 2024
| } | ||
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| if ( $container ) { | ||
| $new_rule = new WP_Style_Engine_CSS_Rules_Container( $container, $new_rule ); |
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A WP_Style_Engine_CSS_Rules_Container also allows us to limit the depth of nested rules to 1
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Does the CSS spec have a name for these? |
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That's a good question. I haven't found anything really striking so far, other than Maybe "nested-rule" is the closest to the spec I can find. |
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In MDN the closest I could find was either "nested" or "conditional group rules" under at-rules... also a bit of a mouthful! |
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Edit: or just "parent" |
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Naming's always hard! I think I lean slightly toward |
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This was just an experiment. Closing in favour of: |
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In progress... this PR will be pared back to satisfy the minimum requirements of #58867. I'm coding "ahead" to validate the approach 😁
What?
Proposed refactor as a follow up to #58867, from which all the ideas flow. Props to @tellthemachines
Provide an API to generate nested CSS rules, e.g.,
Expressed in PHP:
Features:
TODO
@containerqueries) See: Add/try/style engine nested rules explosion/add/grid child spans #58919Why?
To provide a base-line way to add nested rules.
How?
Creating a
WP_Style_Engine_CSS_Rules_Containerthat storesWP_Style_Engine_CSS_Ruleobjects and outputs nested CSS.Accepting a
containervalue in the public API functions of:wp_style_engine_get_stylesheet_from_css_rules()wp_style_engine_get_styles()Testing Instructions
npm run test:unit:php:base -- --group style-engineTesting Instructions for Keyboard
Screenshots or screencast