string AttrView::VariableStrLen() const {
  return Call("strlen", {VariableName()});
}

string AttrView::VariableSpanData() const {
  return Call(VariableName(), "data", {}, ".");
}

string AttrView::VariableSpanLen() const {
  return Call(VariableName(), "length", {}, ".");
}

string AttrView::InputArg(bool with_default_value) const {
  string default_value = DefaultValue();

  string VariableName() const;
  string VariableType() const;
  string AttrNameString() const;
  string VariableStrLen() const;
  string VariableSpanData() const;
  string VariableSpanLen() const;
  string DefaultValue() const;
  string InputArg(bool with_default_value) const;
  string SetterMethod() const;
  std::vector<string> SetterArgs() const;

 private:
  AttrSpec attr_;
};