prettier / prettier/plugin-php

Parens incorrectly removed when cloning the result of an expression

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bug
Dominant language
PHP
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Description

Prettier 2.7.1

PHP Plugin 0.19.1

# Options (if any):
# our .prettierrc
{
    "phpVersion": "8.1",
    "printWidth": 80,
    "tabWidth": 4,
    "useTabs": false,
    "singleQuote": true,
    "trailingCommaPHP": true,
    "braceStyle": "psr-2",
    "requirePragma": false,
    "insertPragma": false
}

Input:

$questions = clone ($panel->primaryViewer()?->questions() ?? new Questions());

Output:

$questions = clone $panel->primaryViewer()?->questions() ?? new Questions();

Expected behavior:

The outermost parens are being removed by prettier, affecting behavior. Given

$questions = clone ($panel->primaryViewer()?->questions() ?? new Questions());

if $panel->primaryViewer() is null, because prettier drops the outermost parens, it ends up leaving PHP to evaluate clone null - something I'm actively guarding against with the null coalesce operator.

I expect the parens to remain in place, resulting in the ?? new Questions() to be cloned.

Contributor guide

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First steps

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  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the reported PHP input and comparing Prettier 2.7.1 with the expected output. Trace the formatter's handling of parentheses around the clone expression; done means the outer parentheses remain so the null-coalesce expression is cloned, with a regression test covering this case.

Written by the indexing model from the issue text.

Assessment

Tech stack
php
Domain
tooling
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Clearly specified
Newbie friendliness
35/100

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