function installPhpParser()

in gen_stub.php [1762:1799]
34 lines of code
7 McCabe index (conditional complexity)

function installPhpParser(string $version, string $phpParserDir) {
    $lockFile = __DIR__ . "/PHP-Parser-install-lock";
    $lockFd = fopen($lockFile, 'w+');
    if (!flock($lockFd, LOCK_EX)) {
        throw new Exception("Failed to acquire installation lock");
    }

    try {
        // Check whether a parallel process has already installed PHP-Parser.
        if (is_dir($phpParserDir)) {
            return;
        }

        $cwd = getcwd();
        chdir(__DIR__);

        $tarName = "v$version.tar.gz";
        passthru("wget https://github.com/nikic/PHP-Parser/archive/$tarName", $exit);
        if ($exit !== 0) {
            passthru("curl -LO https://github.com/nikic/PHP-Parser/archive/$tarName", $exit);
        }
        if ($exit !== 0) {
            throw new Exception("Failed to download PHP-Parser tarball");
        }
        if (!mkdir($phpParserDir)) {
            throw new Exception("Failed to create directory $phpParserDir");
        }
        passthru("tar xvzf $tarName -C PHP-Parser-$version --strip-components 1", $exit);
        if ($exit !== 0) {
            throw new Exception("Failed to extract PHP-Parser tarball");
        }
        unlink(__DIR__ . "/$tarName");
        chdir($cwd);
    } finally {
        flock($lockFd, LOCK_UN);
        @unlink($lockFile);
    }
}