Replace Elvis operator (?:) by null coalesce operator (??) when applicable

Related tags

Miscellaneous psalm-elvis-begone
Overview

psalm-elvis-begone

A Psalm plugin to replace Elvis operator (?:) by null coalesce operator (??) when applicable

Installation:

$ composer require --dev orklah/psalm-elvis-begone
$ vendor/bin/psalm-plugin enable orklah/psalm-elvis-begone

Usage:

Run Psalter command:

$ vendor/bin/psalm --alter --plugin=vendor/orklah/psalm-elvis-begone/src/Plugin.php

Explanation:

The short ternary operator (or Elvis operator ?: ) is used to evaluate return its condition if it's true or the second operand if it's not.

When the type is known and the only falsy value is null, we can actually replace it with the null coalesce operator (??) for strictness and clarity.

It will prevent future values to be evaluated to false when it was not the intention

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Comments
  • invalid php generated

    invalid php generated

    I'm not going to claim the source PHP the tool was asked to deal with was good. Far from it, it was horrible. But the tool's output was worse in so far as it was invalid php.

    Input: ($arr[$opt] ? '1' : null) ?: '0' Output: ($arr[$opt] ? '1' : null ?? '0'

    The context around it: that line is an argument to a function being called.... something like this:

    <?php

class test {
    function weird(string $variable) {
        $array = [
            'a' => 'apple',
            'b' => 'bananana',
        ];
     
        $this->target(
            'Alpha',
            'Bravo',
            ($array[$variable] ? 'Charlie' : null) ?: 'Delta'
        );
            
    }

    function target(string $one, string $two, string $three) {
        echo "$one $two $three" . PHP_EOL;
    }
}

$thing = new test();
$thing->weird('a');
$thing->weird('z');

    (once the resulting php syntax error brought my attention to this bit of code, it was thoroughly re-written and no longer resembles... whatever you want to call the above. I'm filing this just in the hopes you can see an obvious fix and save others from bit of panic that sets in when a commit that was 100% automated tooling fails on a pre-commit hook as simple as a syntax check.)

    opened by cabbey 1
Releases(v1.0.0)
Owner
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GitHub
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