Document Classes ⇒ File ended while scanning use of \@defdefault@ds.

[Ethan Phan]

Hi,

I'm now reading section 4.5 of 'clsguide'. As in this section, the writer discussed about the effects and use of the two constructions:

[code]\LoadClassWithOptions
\LoadPackageWithOptions[/code]
with
[code]\PassOptionsToClass
\PassOptionsToPackage[/code]
He then gave examples compared them to see the difference as following:

First Example
[code]\DeclareOption{landscape}{\@landscapetrue}
\ProcessOptions\relax
\LoadClassWithOptions{article}[/code]
Second Example
[code]\DeclareOption{landscape}{\@landscapetrue}
\DeclareOption*{\PassOptionsToClass{\CurrentOption}{article}}
\ProcessOptions\relax
\LoadClass{article}[/code]

Well, I'm not quite clear of what the author explained, so I made some testing by creating a 'temp.tex'

[code]
% temp.tex using for testing purpose only
\documentclass[<option-list>]{custart}
\begin{document}
\begin{abstract}
It is shown that...
\end{abstract}
\section{Introduction}
A module $ M $ is called ...
\end{document}[/code]
and a custart.cls (customary article class) with its content to be either the first or second example, respectively.

After all, I got some 'strange' results and I don't understand them nor how to fix them. Please help

With the 'custart.cls' together with First Example, and <option-list> to be "landscape" and "titlepage", the typesetting results in PDF is a normal paper (no landspace) in both cases---with or without <option-list>.

With the 'custart.cls' together with Second Example, <option-list> are the same as above, all I got is Errors(!)
If the <option-list> is on, then LaTeX says that the 'abstract' enviroment and also 'section' are undefinded sequences (whereas, in my mind, by calling 'LoadClass{article} they should be well-defined as well).
If either I delete those options, i.e., <option-list> off, or I delete all those 'section' and 'abstract', then last result is "temp.tex | line 2 | File ended while scanning use of \@defdefault@ds. \begin".

Would you explain me again what was happened? If possible, please also help me clearly understand their differences between First and Second Examples. Thank you for reading this.

[Johannes_B]

I don't have much time right now. Here is a short example for you to play around, some notes. Please also have a look at Class for CVs where i was explaining the option handling a bit. If you have further questions, to the linked thread or here, please feel free to ask.

Code: Select all

%\RequirePackage{filecontents}
\begin{filecontents}{\jobname-first.cls}
	\DeclareOption{landscape}{\PassOptionsToClass{landscape}{article}}
	\DeclareOption*{\PassOptionsToClass{\CurrentOption}{article}}
	\ProcessOptions\relax
	\LoadClass{article}
\end{filecontents}
\begin{filecontents}{\jobname-second.cls}
	\DeclareOption{landscape}{\@landscapetrue}%that is never defined
	\DeclareOption*{\PassOptionsToClass{\CurrentOption}{article}}
	\ProcessOptions\relax
	\LoadClass{article}
\end{filecontents}
\documentclass[landscape,titlepage
%]{\jobname-first}
%]{\jobname-second}
]{article}
\title{test}
\author{ethan}
%\input{pdftex.def}
\begin{document}
\maketitle
\begin{abstract}
	It is shown that...
\end{abstract}
\section{Introduction}
A module $ M $ is called
...
\end{document}