src/Fixer/Basic/Psr4Fixer.php
protected function applyFix(\SplFileInfo $file, Tokens $tokens)
    {
        $isNamespaceFound = false;
        $classyIndex = 0;
        $classyName = null;

        foreach ($tokens as $index => $token) {
            if ($token->isGivenKind(T_NAMESPACE)) {
                if ($isNamespaceFound) {
                    return;
                }

                $isNamespaceFound = true;
            } elseif ($token->isClassy()) {
                $prevToken = $tokens[$tokens->getPrevMeaningfulToken($index)];
                if ($prevToken->isGivenKind(T_NEW)) {
                    continue;
                }

                if (null !== $classyName) {
                    return;
                }

                $classyIndex = $tokens->getNextMeaningfulToken($index);
                $classyName = $tokens[$classyIndex]->getContent();
            }
        }

        if (null === $classyName) {
            return;
        }

        if ($isNamespaceFound) {
            $filename = basename(str_replace('\\', '/', $file->getRealPath()), '.php');

            if ($classyName !== $filename) {
                $tokens[$classyIndex] = new Token([T_STRING, $filename]);
            }
        } else {
            $normClass = str_replace('_', '/', $classyName);
            $filename = substr(str_replace('\\', '/', $file->getRealPath()), -\strlen($normClass) - 4, -4);

            if ($normClass !== $filename && strtolower($normClass) === strtolower($filename)) {
                $tokens[$classyIndex] = new Token([T_STRING, str_replace('/', '_', $filename)]);
            }
        }
    }
protected function applyFix(\SplFileInfo $file, Tokens $tokens)
    {
        $isNamespaceFound = false;
        $classyIndex = 0;
        $classyName = null;

        foreach ($tokens as $index => $token) {
            if ($token->isGivenKind(T_NAMESPACE)) {
                if ($isNamespaceFound) {
                    return;
                }

                $isNamespaceFound = true;
            } elseif ($token->isClassy()) {
                $prevToken = $tokens[$tokens->getPrevMeaningfulToken($index)];
                if ($prevToken->isGivenKind(T_NEW)) {
                    continue;
                }

                if (null !== $classyName) {
                    return;
                }

                $classyIndex = $tokens->getNextMeaningfulToken($index);
                $classyName = $tokens[$classyIndex]->getContent();
            }
        }

        if (null === $classyName) {
            return;
        }

        if ($isNamespaceFound) {
            $filename = basename(str_replace('\\', '/', $file->getRealPath()), '.php');

            if ($classyName !== $filename) {
                $tokens[$classyIndex] = new Token([T_STRING, $filename]);
            }
        } else {
            $normClass = str_replace('_', '/', $classyName);
            $filename = substr(str_replace('\\', '/', $file->getRealPath()), -\strlen($normClass) - 4, -4);

            if ($normClass !== $filename && strtolower($normClass) === strtolower($filename)) {
                $tokens[$classyIndex] = new Token([T_STRING, str_replace('/', '_', $filename)]);
            }
        }
    }
{@inheritdoc}