Simplify property memoization for Flyweight pattern by replacing it with ??=
#4084
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Would be great to have an auto-fixable rule that would enforce this under https://github.com/phpstan/phpstan-src/tree/2.1.x/build/PHPStan/Build. Do you think it'd be easy for you to implement that? And verify it by actually using it to make these changes. And compare it to your manual changes 😊 (Yeah, RuleErrorBuilder has |
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I hadn't noticed that they added |
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Yeah, just detect if === null and assignment to the same thing in the only statement. |
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@ondrejmirtes The refactoring feature integrated into PHPStan is a game changer. 🎉 |
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| [$ifNode, $returnNode] = $stmts; | ||
| if (!$returnNode instanceof Return_ | ||
| || !$returnNode->expr instanceof PropertyFetch |
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I think you can do the same for StaticPropertyFetch
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Thanks for the suggestion, I implemented it.
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I described the logic as following:
Yeah, just detect if === null and assignment to the same thing in the only statement.
So even if there's if in the middle of a function body, this rule could detect and change it.
It doesn't matter if there's $this->foo = $foo; or return $this->foo = $foo;. The rule should be able to handle both.
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| public function getNodeType(): string | ||
| { | ||
| return InClassMethodNode::class; |
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I think the rule should apply to If_, not to a method body.
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Ok, it has been reflected in the rule.
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| return []; | ||
| } | ||
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| $errorBuilder = RuleErrorBuilder::message('Memoization property can be simplified.') |
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The message could be better. Something like "This initializing if statement can be replaced with null coalescing assignment operator (??=)."
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I changed the message and squashed the commits!
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MemoizationPropertyRule supports static properties
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Thank you! |
Now that PHP 7.2 has been dropped, this pattern can be replaced.