constexpr string_view pretty_name()

in src/common/utils/Nameof.hpp [425:499]

• 68 lines of code
• 49 McCabe index (conditional complexity)

constexpr string_view pretty_name(string_view name, bool remove_suffix = true) noexcept {
  if (name.size() >= 1 && (name[0] == '"' || name[0] == '\'')) {
    return {};  // Narrow multibyte string literal.
  } else if (name.size() >= 2 && name[0] == 'R' && (name[1] == '"' || name[1] == '\'')) {
    return {};  // Raw string literal.
  } else if (name.size() >= 2 && name[0] == 'L' && (name[1] == '"' || name[1] == '\'')) {
    return {};  // Wide string literal.
  } else if (name.size() >= 2 && name[0] == 'U' && (name[1] == '"' || name[1] == '\'')) {
    return {};  // UTF-32 encoded string literal.
  } else if (name.size() >= 2 && name[0] == 'u' && (name[1] == '"' || name[1] == '\'')) {
    return {};  // UTF-16 encoded string literal.
  } else if (name.size() >= 3 && name[0] == 'u' && name[1] == '8' && (name[2] == '"' || name[2] == '\'')) {
    return {};  // UTF-8 encoded string literal.
  } else if (name.size() >= 1 && (name[0] >= '0' && name[0] <= '9')) {
    return {};  // Invalid name.
  }

  for (std::size_t i = name.size(), h = 0, s = 0; i > 0; --i) {
    if (name[i - 1] == ')') {
      ++h;
      ++s;
      continue;
    } else if (name[i - 1] == '(') {
      --h;
      ++s;
      continue;
    }

    if (h == 0) {
      name.remove_suffix(s);
      break;
    } else {
      ++s;
      continue;
    }
  }

  std::size_t s = 0;
  for (std::size_t i = name.size(), h = 0; i > 0; --i) {
    if (name[i - 1] == '>') {
      ++h;
      ++s;
      continue;
    } else if (name[i - 1] == '<') {
      --h;
      ++s;
      continue;
    }

    if (h == 0) {
      break;
    } else {
      ++s;
      continue;
    }
  }

  for (std::size_t i = name.size() - s; i > 0; --i) {
    if (!((name[i - 1] >= '0' && name[i - 1] <= '9') || (name[i - 1] >= 'a' && name[i - 1] <= 'z') ||
          (name[i - 1] >= 'A' && name[i - 1] <= 'Z') || (name[i - 1] == '_'))) {
      name.remove_prefix(i);
      break;
    }
  }
  if (remove_suffix) {
    name.remove_suffix(s);
  }

  if (name.size() > 0 &&
      ((name[0] >= 'a' && name[0] <= 'z') || (name[0] >= 'A' && name[0] <= 'Z') || (name[0] == '_'))) {
    return name;
  }

  return {};  // Invalid name.
}