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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\Import; use PhpCsFixer\AbstractFixer; use PhpCsFixer\FixerDefinition\CodeSample; use PhpCsFixer\FixerDefinition\FixerDefinition; use PhpCsFixer\FixerDefinition\FixerDefinitionInterface; use PhpCsFixer\Preg; use PhpCsFixer\Tokenizer\Analyzer\Analysis\NamespaceAnalysis; use PhpCsFixer\Tokenizer\Analyzer\Analysis\NamespaceUseAnalysis; use PhpCsFixer\Tokenizer\Analyzer\GotoLabelAnalyzer; use PhpCsFixer\Tokenizer\Analyzer\NamespaceUsesAnalyzer; use PhpCsFixer\Tokenizer\CT; use PhpCsFixer\Tokenizer\Token; use PhpCsFixer\Tokenizer\Tokens; use PhpCsFixer\Tokenizer\TokensAnalyzer; /** * @author Dariusz Rumiński <dariusz.ruminski@gmail.com> */ final class NoUnusedImportsFixer extends AbstractFixer { public function getDefinition(): FixerDefinitionInterface { return new FixerDefinition( 'Unused `use` statements must be removed.', [new CodeSample("<?php\nuse \\DateTime;\nuse \\Exception;\n\nnew DateTime();\n")] ); } /** * {@inheritdoc} * * Must run before BlankLineAfterNamespaceFixer, NoExtraBlankLinesFixer, NoLeadingImportSlashFixer, SingleLineAfterImportsFixer. * Must run after ClassKeywordRemoveFixer, GlobalNamespaceImportFixer, PhpUnitDedicateAssertFixer, PhpUnitFqcnAnnotationFixer. */ public function getPriority(): int { return -10; } public function isCandidate(Tokens $tokens): bool { return $tokens->isTokenKindFound(T_USE); } protected function applyFix(\SplFileInfo $file, Tokens $tokens): void { $useDeclarations = (new NamespaceUsesAnalyzer())->getDeclarationsFromTokens($tokens, true); if (0 === \count($useDeclarations)) { return; } foreach ($tokens->getNamespaceDeclarations() as $namespace) { $currentNamespaceUseDeclarations = []; $currentNamespaceUseDeclarationIndices = []; foreach ($useDeclarations as $useDeclaration) { if ($useDeclaration->getStartIndex() >= $namespace->getScopeStartIndex() && $useDeclaration->getEndIndex() <= $namespace->getScopeEndIndex()) { $currentNamespaceUseDeclarations[] = $useDeclaration; $currentNamespaceUseDeclarationIndices[$useDeclaration->getStartIndex()] = $useDeclaration->getEndIndex(); } } foreach ($currentNamespaceUseDeclarations as $useDeclaration) { if (!$this->isImportUsed($tokens, $namespace, $useDeclaration, $currentNamespaceUseDeclarationIndices)) { $this->removeUseDeclaration($tokens, $useDeclaration); } } $this->removeUsesInSameNamespace($tokens, $currentNamespaceUseDeclarations, $namespace); } } /** * @param array<int, int> $ignoredIndices indices of the use statements themselves that should not be checked as being "used" */ private function isImportUsed(Tokens $tokens, NamespaceAnalysis $namespace, NamespaceUseAnalysis $import, array $ignoredIndices): bool { $analyzer = new TokensAnalyzer($tokens); $gotoLabelAnalyzer = new GotoLabelAnalyzer(); $tokensNotBeforeFunctionCall = [T_NEW]; $attributeIsDefined = \defined('T_ATTRIBUTE'); if ($attributeIsDefined) { // @TODO: drop condition when PHP 8.0+ is required $tokensNotBeforeFunctionCall[] = T_ATTRIBUTE; } $namespaceEndIndex = $namespace->getScopeEndIndex(); $inAttribute = false; for ($index = $namespace->getScopeStartIndex(); $index <= $namespaceEndIndex; ++$index) { $token = $tokens[$index]; if ($attributeIsDefined && $token->isGivenKind(T_ATTRIBUTE)) { $inAttribute = true; continue; } if ($attributeIsDefined && $token->isGivenKind(CT::T_ATTRIBUTE_CLOSE)) { $inAttribute = false; continue; } if (isset($ignoredIndices[$index])) { $index = $ignoredIndices[$index]; continue; } if ($token->isGivenKind(T_STRING)) { if (0 !== strcasecmp($import->getShortName(), $token->getContent())) { continue; } $prevMeaningfulToken = $tokens[$tokens->getPrevMeaningfulToken($index)]; if ($prevMeaningfulToken->isGivenKind(T_NAMESPACE)) { $index = $tokens->getNextTokenOfKind($index, [';', '{', [T_CLOSE_TAG]]); continue; } if ( $prevMeaningfulToken->isGivenKind([T_NS_SEPARATOR, T_FUNCTION, T_CONST, T_DOUBLE_COLON]) || $prevMeaningfulToken->isObjectOperator() ) { continue; } if ($inAttribute) { return true; } $nextMeaningfulIndex = $tokens->getNextMeaningfulToken($index); if ($gotoLabelAnalyzer->belongsToGoToLabel($tokens, $nextMeaningfulIndex)) { continue; } $nextMeaningfulToken = $tokens[$nextMeaningfulIndex]; if ($analyzer->isConstantInvocation($index)) { $type = NamespaceUseAnalysis::TYPE_CONSTANT; } elseif ($nextMeaningfulToken->equals('(') && !$prevMeaningfulToken->isGivenKind($tokensNotBeforeFunctionCall)) { $type = NamespaceUseAnalysis::TYPE_FUNCTION; } else { $type = NamespaceUseAnalysis::TYPE_CLASS; } if ($import->getType() === $type) { return true; } continue; } if ($token->isComment() && Preg::match( '/(?<![[:alnum:]\$])(?<!\\\)'.$import->getShortName().'(?![[:alnum:]])/i', $token->getContent() ) ) { return true; } } return false; } private function removeUseDeclaration( Tokens $tokens, NamespaceUseAnalysis $useDeclaration, bool $forceCompleteRemoval = false ): void { [$start, $end] = ($useDeclaration->isInMulti() && !$forceCompleteRemoval) ? [$useDeclaration->getChunkStartIndex(), $useDeclaration->getChunkEndIndex()] : [$useDeclaration->getStartIndex(), $useDeclaration->getEndIndex()]; $loopStartIndex = $useDeclaration->isInMulti() || $forceCompleteRemoval ? $end : $end - 1; for ($index = $loopStartIndex; $index >= $start; --$index) { if ($tokens[$index]->isComment()) { continue; } if (!$tokens[$index]->isWhitespace() || !str_contains($tokens[$index]->getContent(), "\n")) { $tokens->clearAt($index); continue; } // when multi line white space keep the line feed if the previous token is a comment $prevIndex = $tokens->getPrevNonWhitespace($index); if ($tokens[$prevIndex]->isComment()) { $content = $tokens[$index]->getContent(); $tokens[$index] = new Token([T_WHITESPACE, substr($content, strrpos($content, "\n"))]); // preserve indent only } else { $tokens->clearTokenAndMergeSurroundingWhitespace($index); } } // For multi-use import statements the tokens containing FQN were already removed in the loop above. // We need to clean up tokens around the ex-chunk to keep the correct syntax and achieve proper formatting. if (!$forceCompleteRemoval && $useDeclaration->isInMulti()) { $this->cleanUpAfterImportChunkRemoval($tokens, $useDeclaration); return; } if ($tokens[$useDeclaration->getEndIndex()]->equals(';')) { // do not remove `? >` $tokens->clearAt($useDeclaration->getEndIndex()); } $this->cleanUpSurroundingNewLines($tokens, $useDeclaration); } /** * @param list<NamespaceUseAnalysis> $useDeclarations */ private function removeUsesInSameNamespace(Tokens $tokens, array $useDeclarations, NamespaceAnalysis $namespaceDeclaration): void { $namespace = $namespaceDeclaration->getFullName(); $nsLength = \strlen($namespace.'\\'); foreach ($useDeclarations as $useDeclaration) { if ($useDeclaration->isAliased()) { continue; } $useDeclarationFullName = ltrim($useDeclaration->getFullName(), '\\'); if (!str_starts_with($useDeclarationFullName, $namespace.'\\')) { continue; } $partName = substr($useDeclarationFullName, $nsLength); if (!str_contains($partName, '\\')) { $this->removeUseDeclaration($tokens, $useDeclaration); } } } private function cleanUpAfterImportChunkRemoval(Tokens $tokens, NamespaceUseAnalysis $useDeclaration): void { $beforeChunkIndex = $tokens->getPrevMeaningfulToken($useDeclaration->getChunkStartIndex()); $afterChunkIndex = $tokens->getNextMeaningfulToken($useDeclaration->getChunkEndIndex()); $hasNonEmptyTokenBefore = $this->scanForNonEmptyTokensUntilNewLineFound( $tokens, $afterChunkIndex, -1 ); $hasNonEmptyTokenAfter = $this->scanForNonEmptyTokensUntilNewLineFound( $tokens, $afterChunkIndex, 1 ); // We don't want to merge consequent new lines with indentation (leading to e.g. `\n \n `), // so it's safe to merge whitespace only if there is any non-empty token before or after the chunk. $mergingSurroundingWhitespaceIsSafe = $hasNonEmptyTokenBefore[1] || $hasNonEmptyTokenAfter[1]; $clearToken = static function (int $index) use ($tokens, $mergingSurroundingWhitespaceIsSafe): void { if ($mergingSurroundingWhitespaceIsSafe) { $tokens->clearTokenAndMergeSurroundingWhitespace($index); } else { $tokens->clearAt($index); } }; if ($tokens[$afterChunkIndex]->equals(',')) { $clearToken($afterChunkIndex); } elseif ($tokens[$beforeChunkIndex]->equals(',')) { $clearToken($beforeChunkIndex); } // Ensure there's a single space where applicable, otherwise no space (before comma, before closing brace) for ($index = $beforeChunkIndex; $index <= $afterChunkIndex; ++$index) { if (null === $tokens[$index]->getId() || !$tokens[$index]->isWhitespace(' ')) { continue; } $nextTokenIndex = $tokens->getNextMeaningfulToken($index); if ( $tokens[$nextTokenIndex]->equals(',') || $tokens[$nextTokenIndex]->equals(';') || $tokens[$nextTokenIndex]->isGivenKind([CT::T_GROUP_IMPORT_BRACE_CLOSE]) ) { $tokens->clearAt($index); } else { $tokens[$index] = new Token([T_WHITESPACE, ' ']); } $prevTokenIndex = $tokens->getPrevMeaningfulToken($index); if ($tokens[$prevTokenIndex]->isGivenKind([CT::T_GROUP_IMPORT_BRACE_OPEN])) { $tokens->clearAt($index); } } $this->removeLineIfEmpty($tokens, $useDeclaration); $this->removeImportStatementIfEmpty($tokens, $useDeclaration); } private function cleanUpSurroundingNewLines(Tokens $tokens, NamespaceUseAnalysis $useDeclaration): void { $prevIndex = $useDeclaration->getStartIndex() - 1; $prevToken = $tokens[$prevIndex]; if ($prevToken->isWhitespace()) { $content = rtrim($prevToken->getContent(), " \t"); $tokens->ensureWhitespaceAtIndex($prevIndex, 0, $content); $prevToken = $tokens[$prevIndex]; } if (!isset($tokens[$useDeclaration->getEndIndex() + 1])) { return; } $nextIndex = $tokens->getNonEmptySibling($useDeclaration->getEndIndex(), 1); if (null === $nextIndex) { return; } $nextToken = $tokens[$nextIndex]; if ($nextToken->isWhitespace()) { $content = Preg::replace( "#^\r\n|^\n#", '', ltrim($nextToken->getContent(), " \t"), 1 ); $tokens->ensureWhitespaceAtIndex($nextIndex, 0, $content); $nextToken = $tokens[$nextIndex]; } if ($prevToken->isWhitespace() && $nextToken->isWhitespace()) { $content = $prevToken->getContent().$nextToken->getContent(); $tokens->ensureWhitespaceAtIndex($nextIndex, 0, $content); $tokens->clearAt($prevIndex); } } private function removeImportStatementIfEmpty(Tokens $tokens, NamespaceUseAnalysis $useDeclaration): void { // First we look for empty groups where all chunks were removed (`use Foo\{};`). // We're only interested in ending brace if its index is between start and end of the import statement. $endingBraceIndex = $tokens->getPrevTokenOfKind( $useDeclaration->getEndIndex(), [[CT::T_GROUP_IMPORT_BRACE_CLOSE]] ); if ($endingBraceIndex > $useDeclaration->getStartIndex()) { $openingBraceIndex = $tokens->getPrevMeaningfulToken($endingBraceIndex); if ($tokens[$openingBraceIndex]->isGivenKind(CT::T_GROUP_IMPORT_BRACE_OPEN)) { $this->removeUseDeclaration($tokens, $useDeclaration, true); } } // Second we look for empty groups where all comma-separated chunks were removed (`use;`). $beforeSemicolonIndex = $tokens->getPrevMeaningfulToken($useDeclaration->getEndIndex()); if ( $tokens[$beforeSemicolonIndex]->isGivenKind([T_USE]) || \in_array($tokens[$beforeSemicolonIndex]->getContent(), ['function', 'const'], true) ) { $this->removeUseDeclaration($tokens, $useDeclaration, true); } } private function removeLineIfEmpty(Tokens $tokens, NamespaceUseAnalysis $useAnalysis): void { if (!$useAnalysis->isInMulti()) { return; } $hasNonEmptyTokenBefore = $this->scanForNonEmptyTokensUntilNewLineFound( $tokens, $useAnalysis->getChunkStartIndex(), -1 ); $hasNonEmptyTokenAfter = $this->scanForNonEmptyTokensUntilNewLineFound( $tokens, $useAnalysis->getChunkEndIndex(), 1 ); if ( \is_int($hasNonEmptyTokenBefore[0]) && !$hasNonEmptyTokenBefore[1] && \is_int($hasNonEmptyTokenAfter[0]) && !$hasNonEmptyTokenAfter[1] ) { $tokens->clearRange($hasNonEmptyTokenBefore[0], $hasNonEmptyTokenAfter[0] - 1); } } /** * Returns tuple with the index of first token with whitespace containing new line char * and a flag if any non-empty token was found along the way. * * @param -1|1 $direction * * @return array{0: null|int, 1: bool} */ private function scanForNonEmptyTokensUntilNewLineFound(Tokens $tokens, int $index, int $direction): array { $hasNonEmptyToken = false; $newLineTokenIndex = null; // Iterate until we find new line OR we get out of $tokens bounds (next sibling index is `null`). while (\is_int($index)) { $index = $tokens->getNonEmptySibling($index, $direction); if (null === $index || null === $tokens[$index]->getId()) { continue; } if (!$tokens[$index]->isWhitespace()) { $hasNonEmptyToken = true; } elseif (str_starts_with($tokens[$index]->getContent(), "\n")) { $newLineTokenIndex = $index; break; } } return [$newLineTokenIndex, $hasNonEmptyToken]; } }
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