AbstractFunctionParameterSniff: don't ignore first class callables#2544
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jrfnl merged 2 commits intoJul 22, 2025
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... but pass them to a dedicated `process_first_class_callable()` method instead to allow sniffs to decide whether to flag these or not. Typical use-case for why first class callables should not be ignored by default: A sniff which ALWAYS flags the use of a certain function, but has different error messages depending on whether parameters are passed or not. In that situation, I believe first class callables should be treated the same as other uses of the target function. First class callables are basically syntax sugar for closures (example: https://3v4l.org/cra8s) and if the sniff would flag the use of the target function within a closure, it is only reasonable to also flag the use of the target function as a first class callable. This commit implements this. The commit does not include tests as there are no sniffs in WPCS for which the above would apply. However, I have manually tested this change via a sniff in an external standard for which this change is relevant.
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Just to clarify - the previous PR did add tests with first class callables, so the logic in this PR is actually covered by tests. |
rodrigoprimo
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Jul 18, 2025
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@GaryJones @dingo-d Could you please have a look at this ? |
GaryJones
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Jul 21, 2025
dingo-d
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Jul 21, 2025
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…lables
First class callables are basically syntax sugar for closures.
So:
```php
add_action('my_action', strip_tags(...));
```
... could also be written as:
```php
add_action('my_action', function(...$args) {
return strip_tags(...$args);
});
```
Example: https://3v4l.org/cra8s#veol
As the code would be flagged when used in a closure, it is my opinion, it should also be flagged when used as a first class callable.
This commit implements this in a WPCS cross-version compatible manner.
Prior to WPCS 3.2.0, first class callables would be send to the `process_no_parameters()` method.
As of WPCS 3.2.0, they will be send to the dedicated `process_first_class_callable()` method. See WordPress/WordPress-Coding-Standards#2544
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... but pass them to a dedicated
process_first_class_callable()method instead to allow sniffs to decide whether to flag these or not.Typical use-case for why first class callables should not be ignored by default:
A sniff which ALWAYS flags the use of a certain function, but has different error messages depending on whether parameters are passed or not.
In that situation, I believe first class callables should be treated the same as other uses of the target function.
First class callables are basically syntax sugar for closures (example: https://3v4l.org/cra8s) and if the sniff would flag the use of the target function within a closure, it is only reasonable to also flag the use of the target function as a first class callable.
This commit implements this.
The commit does not include tests as there are no sniffs in WPCS for which the above would apply. However, I have manually tested this change via a sniff in an external standard for which this change is relevant.
Follow up on #2518, also see: #2518 (comment)