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Global Styles: refactor how we iterate over the tree #30801

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merged 11 commits into from
Apr 14, 2021

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@oandregal oandregal commented Apr 13, 2021

Extracted from #30541 so it can land in pieces and make reviews easier/quicker.

This PR refactors the existing WP_Theme_JSON methods so they operate over nodes and so are independent of the theme.json structure. The logic about which paths to iterate over (the structure of theme.json) is centralized in two methods: get_style_nodes and get_setting_nodes. After this change, #30541 only has to update the get_style_nodes and get_setting_nodes logic to compute the paths based on the new structure ― the other methods will remain unchanged.

Perhaps the quickest way to review this PR is going commit by commit and compare the before/after changes. It doesn't change any behavior, only the internal logic of the methods ― I tried to keep each commit isolate for ease of review.

How to test

npm run test-unit-php /var/www/html/wp-content/plugins/gutenberg/phpunit/class-wp-theme-json-test.php

@oandregal oandregal self-assigned this Apr 13, 2021
@oandregal oandregal added [Type] Code Quality Issues or PRs that relate to code quality Global Styles Anything related to the broader Global Styles efforts, including Styles Engine and theme.json labels Apr 13, 2021
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@oandregal
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This is ready for review.

@oandregal oandregal requested a review from ockham April 14, 2021 07:04
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I personally don't like the fact that we rely on intermediary objects like "$metadata", one person reading the code reading the code need to wrap its head around these and understand these structures while a function to retrieve css_variables from theme.json is more straightforward. It just requires one to know the input "theme.json" and the output "css variables".

I also don't like that we actually test internal implementation details because it prevents folks from doing refactoring. Do we expect users of the class to call get_setting_nodes and get_style_nodes from the outside or are these constructions just internal implementation details in which case in which case the unit test is not really a good idea for me unless we want to test something critical?

I guess this is me saying that I'd prefer if we remove the arguments and block_metadata entirely.

I also say this acknowledging that it's not that important. In other words

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Despite my opinion on how to architecture code, this doesn't bother me much, the important right now is that we implement the new schema rapidly and if this is a step towards that, I'm fine with it.

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gziolo commented Apr 14, 2021

I guess it's safer to go with the intermediate approach where we use those lower-level functions that are easier to test. However, on principle, I totally agree that in the end, we should have a much higher-level API that tests everything integrated together.

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oandregal commented Apr 14, 2021

Yes to revisit the higher-level APIs after the new shape is in place ― and with the help of an extensive test suite I feel way more comfortable 🙂

I also don't like that we actually test internal implementation details because it prevents folks from doing refactoring. Do we expect users of the class to call get_setting_nodes and get_style_nodes from the outside or are these constructions just internal implementation details in which case the unit test is not really a good idea for me unless we want to test something critical?

I'm also uncomfortable making get_style_nodes and get_setting_nodes public. I don't expect any consumer to use these. The reason I wanted to test them is that it's immediately obvious if they fail what's the core issue (no need to debug to understand why a public method fails). I find the value it provides outweighs my concerns or requiring the methods to be public. Happy to remove them after #30541 if people find these outrageous and/or go with a different approach (prepend the method name with _ such as _get_style_nodes, is that something we do?).

I'm going to merge this one to continue the work.

@oandregal oandregal merged commit 89ca6f7 into trunk Apr 14, 2021
@oandregal oandregal deleted the update/iterate-over-nodes branch April 14, 2021 10:52
@github-actions github-actions bot added this to the Gutenberg 10.5 milestone Apr 14, 2021
@oandregal oandregal mentioned this pull request Apr 14, 2021
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#31224 made the utility methods private and removed the tests as well.

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