bool ParseFileName()

in db/filename.cc [80:124]

• 43 lines of code
• 13 McCabe index (conditional complexity)

bool ParseFileName(const std::string& fname,
                   uint64_t* number,
                   FileType* type) {
  Slice rest(fname);
  if (rest == "CURRENT") {
    *number = 0;
    *type = kCurrentFile;
  } else if (rest == "LOCK") {
    *number = 0;
    *type = kDBLockFile;
  } else if (rest == "LOG" || rest == "LOG.old") {
    *number = 0;
    *type = kInfoLogFile;
  } else if (rest.starts_with("MANIFEST-")) {
    rest.remove_prefix(strlen("MANIFEST-"));
    uint64_t num;
    if (!ConsumeDecimalNumber(&rest, &num)) {
      return false;
    }
    if (!rest.empty()) {
      return false;
    }
    *type = kDescriptorFile;
    *number = num;
  } else {
    // Avoid strtoull() to keep filename format independent of the
    // current locale
    uint64_t num;
    if (!ConsumeDecimalNumber(&rest, &num)) {
      return false;
    }
    Slice suffix = rest;
    if (suffix == Slice(".log")) {
      *type = kLogFile;
    } else if (suffix == Slice(".sst") || suffix == Slice(".ldb")) {
      *type = kTableFile;
    } else if (suffix == Slice(".dbtmp")) {
      *type = kTempFile;
    } else {
      return false;
    }
    *number = num;
  }
  return true;
}