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NoSuperfluousElseifFixer.php
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NoSuperfluousElseifFixer.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\ControlStructure;
use PhpCsFixer\AbstractNoUselessElseFixer;
use PhpCsFixer\FixerDefinition\CodeSample;
use PhpCsFixer\FixerDefinition\FixerDefinition;
use PhpCsFixer\FixerDefinition\FixerDefinitionInterface;
use PhpCsFixer\Preg;
use PhpCsFixer\Tokenizer\Token;
use PhpCsFixer\Tokenizer\Tokens;
final class NoSuperfluousElseifFixer extends AbstractNoUselessElseFixer
{
public function isCandidate(Tokens $tokens): bool
{
return $tokens->isAnyTokenKindsFound([T_ELSE, T_ELSEIF]);
}
public function getDefinition(): FixerDefinitionInterface
{
return new FixerDefinition(
'Replaces superfluous `elseif` with `if`.',
[
new CodeSample("<?php\nif (\$a) {\n return 1;\n} elseif (\$b) {\n return 2;\n}\n"),
]
);
}
/**
* {@inheritdoc}
*
* Must run before SimplifiedIfReturnFixer.
* Must run after NoAlternativeSyntaxFixer.
*/
public function getPriority(): int
{
return parent::getPriority();
}
protected function applyFix(\SplFileInfo $file, Tokens $tokens): void
{
foreach ($tokens as $index => $token) {
if ($this->isElseif($tokens, $index) && $this->isSuperfluousElse($tokens, $index)) {
$this->convertElseifToIf($tokens, $index);
}
}
}
private function isElseif(Tokens $tokens, int $index): bool
{
return
$tokens[$index]->isGivenKind(T_ELSEIF)
|| ($tokens[$index]->isGivenKind(T_ELSE) && $tokens[$tokens->getNextMeaningfulToken($index)]->isGivenKind(T_IF));
}
private function convertElseifToIf(Tokens $tokens, int $index): void
{
if ($tokens[$index]->isGivenKind(T_ELSE)) {
$tokens->clearTokenAndMergeSurroundingWhitespace($index);
} else {
$tokens[$index] = new Token([T_IF, 'if']);
}
$whitespace = '';
for ($previous = $index - 1; $previous > 0; --$previous) {
$token = $tokens[$previous];
if ($token->isWhitespace() && Preg::match('/(\R\N*)$/', $token->getContent(), $matches)) {
$whitespace = $matches[1];
break;
}
}
if ('' === $whitespace) {
return;
}
$previousToken = $tokens[$index - 1];
if (!$previousToken->isWhitespace()) {
$tokens->insertAt($index, new Token([T_WHITESPACE, $whitespace]));
} elseif (!Preg::match('/\R/', $previousToken->getContent())) {
$tokens[$index - 1] = new Token([T_WHITESPACE, $whitespace]);
}
}
}