Document Classes ⇒ Class vs Document Code Mismatch

[gseba]

Hi there,

I have a class, try to invoke macros/commands via my special macro, but I get no expansion in the class when using \newcommandx, while it is working in the document or without the optional first argument.

I provide a MWE. The console output of latexing the document from 4 \typeouts is:

Code: Select all

--- rollover beethoven ---
--- \mwe@{macro}{beethoven} ---
--- rollover beethoven ---
--- rollover beethoven ---

The second comes from within the class, and I expect should be as the other three!

Class is the file mwe.cls:

Code: Select all

\NeedsTeXFormat{LaTeX2e}[1995/12/01]
\ProvidesClass{./mwe}
[2011/10/14 v1.0
 A mwe class]
\IfFileExists{xargs.sty}{%
  \RequirePackage{xargs}}{%
  \ClassError{./mwe}{%
    The xargs package was not found.}{%
    The xargs package provides for commands and environments.%
  }}
\newcommand\mwe@test[1]{\typeout{--- #1 ---}}
\newcommand\mwemacro[1]{rollover #1 ---}
\newcommandx\mwe@[2]{\@nameuse{mwe#1}{#2}}
\mwe@test{\mwe@{macro}{beethoven}}
\renewcommandx\mwe@[3][1=mwe]{\csname#1#2\endcsname{#3}}% here
\mwe@test{\mwe@{macro}{beethoven}}
\LoadClass[a4paper,10pt,twoside,openright]{report}[2007/10/19]
\endinput

It loads report; in the same directory, the document is the file mwe.tex:

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\documentclass{./mwe}
\begin{document}

\makeatletter
\newcommandx\myt@st[1]{\typeout{--- rollover #1 ---}}
\newcommandx\use@[3][1=my]{\@nameuse{#1#2}{#3}}
\use@{t@st}{beethoven}
\makeatother

\TeX\space it.

\newcommand\mytest[1]{\typeout{--- rollover #1 ---}}
\newcommand\use[3][my]{\csname#1#2\endcsname{#3}}
\use{test}{beethoven}
\end{document}

The class uses package xargs. Actually, I need my special invocation command for \newcommandx's defined with optional trailing arguments too (square brackets). There are in fact a series of similar special macros to replace many otherwise occurring \@nameuse's.

Yet I cannot seem to fix this. Why is there no expansion in the class code for the \newcommandx with optional first parameter?

Thanks for your help or reply,
Sebastian