PhpCsFixer\Fixer\NamespaceNotation\NoLeadingNamespaceWhitespaceFixer::fix PHP Method

    public function fix(\SplFileInfo $file, Tokens $tokens)
    {
        for ($index = count($tokens) - 1; 0 <= $index; --$index) {
            $token = $tokens[$index];
            if (!$token->isGivenKind(T_NAMESPACE)) {
                continue;
            }
            $beforeNamespace = $tokens[$index - 1];
            if (!$beforeNamespace->isWhitespace()) {
                if (!self::endsWithWhitespace($beforeNamespace->getContent())) {
                    $tokens->insertAt($index, new Token(array(T_WHITESPACE, $this->whitespacesConfig->getLineEnding())));
                }
                continue;
            }
            $lastNewline = strrpos($beforeNamespace->getContent(), "\n");
            if (false === $lastNewline) {
                $beforeBeforeNamespace = $tokens[$index - 2];
                if (self::endsWithWhitespace($beforeBeforeNamespace->getContent())) {
                    $beforeNamespace->clear();
                } else {
                    $beforeNamespace->setContent(' ');
                }
            } else {
                $beforeNamespace->setContent(substr($beforeNamespace->getContent(), 0, $lastNewline + 1));
            }
        }
    }