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AssignNullCoalescingToCoalesceEqualFixer.php
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AssignNullCoalescingToCoalesceEqualFixer.php
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<?php
declare(strict_types=1);
/*
* This file is part of PHP CS Fixer.
*
* (c) Fabien Potencier <fabien@symfony.com>
* Dariusz Rumiński <dariusz.ruminski@gmail.com>
*
* This source file is subject to the MIT license that is bundled
* with this source code in the file LICENSE.
*/
namespace PhpCsFixer\Fixer\Operator;
use PhpCsFixer\Fixer\AbstractShortOperatorFixer;
use PhpCsFixer\FixerDefinition\CodeSample;
use PhpCsFixer\FixerDefinition\FixerDefinition;
use PhpCsFixer\FixerDefinition\FixerDefinitionInterface;
use PhpCsFixer\Tokenizer\Token;
use PhpCsFixer\Tokenizer\Tokens;
final class AssignNullCoalescingToCoalesceEqualFixer extends AbstractShortOperatorFixer
{
public function getDefinition(): FixerDefinitionInterface
{
return new FixerDefinition(
'Use the null coalescing assignment operator `??=` where possible.',
[
new CodeSample(
"<?php\n\$foo = \$foo ?? 1;\n",
),
]
);
}
/**
* {@inheritdoc}
*
* Must run before BinaryOperatorSpacesFixer, NoWhitespaceInBlankLineFixer.
* Must run after TernaryToNullCoalescingFixer.
*/
public function getPriority(): int
{
return -1;
}
public function isCandidate(Tokens $tokens): bool
{
return $tokens->isTokenKindFound(T_COALESCE);
}
protected function isOperatorTokenCandidate(Tokens $tokens, int $index): bool
{
if (!$tokens[$index]->isGivenKind(T_COALESCE)) {
return false;
}
// make sure after '??' does not contain '? :'
$nextIndex = $tokens->getNextTokenOfKind($index, ['?', ';', [T_CLOSE_TAG]]);
return !$tokens[$nextIndex]->equals('?');
}
protected function getReplacementToken(Token $token): Token
{
return new Token([T_COALESCE_EQUAL, '??=']);
}
}