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StaticLambdaFixer.php
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StaticLambdaFixer.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\FunctionNotation;
use PhpCsFixer\AbstractFixer;
use PhpCsFixer\FixerDefinition\CodeSample;
use PhpCsFixer\FixerDefinition\FixerDefinition;
use PhpCsFixer\FixerDefinition\FixerDefinitionInterface;
use PhpCsFixer\Tokenizer\CT;
use PhpCsFixer\Tokenizer\Token;
use PhpCsFixer\Tokenizer\Tokens;
use PhpCsFixer\Tokenizer\TokensAnalyzer;
final class StaticLambdaFixer extends AbstractFixer
{
public function getDefinition(): FixerDefinitionInterface
{
return new FixerDefinition(
'Lambdas not (indirectly) referencing `$this` must be declared `static`.',
[new CodeSample("<?php\n\$a = function () use (\$b)\n{ echo \$b;\n};\n")],
null,
'Risky when using `->bindTo` on lambdas without referencing to `$this`.'
);
}
public function isCandidate(Tokens $tokens): bool
{
return $tokens->isAnyTokenKindsFound([T_FUNCTION, T_FN]);
}
public function isRisky(): bool
{
return true;
}
protected function applyFix(\SplFileInfo $file, Tokens $tokens): void
{
$analyzer = new TokensAnalyzer($tokens);
$expectedFunctionKinds = [T_FUNCTION, T_FN];
for ($index = $tokens->count() - 4; $index > 0; --$index) {
if (!$tokens[$index]->isGivenKind($expectedFunctionKinds) || !$analyzer->isLambda($index)) {
continue;
}
$prev = $tokens->getPrevMeaningfulToken($index);
if ($tokens[$prev]->isGivenKind(T_STATIC)) {
continue; // lambda is already 'static'
}
$argumentsStartIndex = $tokens->getNextTokenOfKind($index, ['(']);
$argumentsEndIndex = $tokens->findBlockEnd(Tokens::BLOCK_TYPE_PARENTHESIS_BRACE, $argumentsStartIndex);
// figure out where the lambda starts and ends
if ($tokens[$index]->isGivenKind(T_FUNCTION)) {
$lambdaOpenIndex = $tokens->getNextTokenOfKind($argumentsEndIndex, ['{']);
$lambdaEndIndex = $tokens->findBlockEnd(Tokens::BLOCK_TYPE_CURLY_BRACE, $lambdaOpenIndex);
} else { // T_FN
$lambdaOpenIndex = $tokens->getNextTokenOfKind($argumentsEndIndex, [[T_DOUBLE_ARROW]]);
$lambdaEndIndex = $analyzer->getLastTokenIndexOfArrowFunction($index);
}
if ($this->hasPossibleReferenceToThis($tokens, $lambdaOpenIndex, $lambdaEndIndex)) {
continue;
}
// make the lambda static
$tokens->insertAt(
$index,
[
new Token([T_STATIC, 'static']),
new Token([T_WHITESPACE, ' ']),
]
);
$index -= 4; // fixed after a lambda, closes candidate is at least 4 tokens before that
}
}
/**
* Returns 'true' if there is a possible reference to '$this' within the given tokens index range.
*/
private function hasPossibleReferenceToThis(Tokens $tokens, int $startIndex, int $endIndex): bool
{
for ($i = $startIndex; $i <= $endIndex; ++$i) {
if ($tokens[$i]->isGivenKind(T_VARIABLE) && '$this' === strtolower($tokens[$i]->getContent())) {
return true; // directly accessing '$this'
}
if ($tokens[$i]->isGivenKind([
T_INCLUDE, // loading additional symbols we cannot analyze here
T_INCLUDE_ONCE, // "
T_REQUIRE, // "
T_REQUIRE_ONCE, // "
CT::T_DYNAMIC_VAR_BRACE_OPEN, // "$h = ${$g};" case
T_EVAL, // "$c = eval('return $this;');" case
])) {
return true;
}
if ($tokens[$i]->equals('$')) {
$nextIndex = $tokens->getNextMeaningfulToken($i);
if ($tokens[$nextIndex]->isGivenKind(T_VARIABLE)) {
return true; // "$$a" case
}
}
if ($tokens[$i]->equals([T_STRING, 'parent'], false)) {
return true; // parent:: case
}
}
return false;
}
}