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From: Peter Rolf <peter.rolf@arcor.de>
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Subject: parameter mechanism
Date: Wed, 27 Aug 2003 15:32:32 +0200
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This is a multi-part message in MIME format.
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Hello all,

I have problems to understand the command (parameter) mechanism of context.
My experiments with \getparameters didn't work, so I used 
\xdescgetparameters
from Giuseppe Bilotta (t-xdesc.tex).
In my eyes they look the same, but \xdescgetparameters works with my sample
code, \getparameters don't. Mhhh....

% t-xdesc.tex
\def\xdescsetvalue#1#2{\expandafter\def\csname#1#2\endcsname}
\def\xdescgetparameters{\dogetparameters\xdescsetvalue}

% syst-gen.tex
\def\dosetvalue#1#2% #3
  {\@EA\def\csname#1#2\endcsname} % {#3}}
\def\getparameters   {\dogetparameters\dosetvalue}

This leads me to my two questions:
What must I change, to make my test example run with \getparameters?

Where is the error in my \docommand? All parameters but [height] work and
the tracing output at this parameter (\OTRSETshowstatus) says nothing to me.

Thanks for any help,

   Peter


P.S.: using miktex 2.3, context version 21.08.2003

--------------040500080309070907030506
Content-Type: application/x-tex;
 name="Cmd.tex"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline;
 filename="Cmd.tex"

% interface=en output=pdftex
% Time-stamp: <Mittwoch, 27 August 2003 14:56:30; cmd.tex>
%
\newdimen\Headheigth	\Headheigth=45mm
\newdimen\Headwidth	\Headwidth=\textwidth
\newdimen\Headhpos	\Headhpos=20mm
\newdimen\Headvpos	\Headvpos=16.9mm


\def\xdescsetvalue#1#2{\expandafter\def\csname#1#2\endcsname}
\def\xdescgetparameters{\dogetparameters\xdescsetvalue}


\def\SetupTesthead{\dosingleargument\doSetupTesthead}

\def\doSetupTesthead[#1]{%
  \xdescgetparameters[TH][#1]
  \def\Headervariableslist{hpos,vpos,height,width}

  \def\docommand##1{\doifdefined{TH##1}%
    {\getvalue{Head##1}=\getvalue{TH##1}}}
  \processcommacommand[\Headervariableslist]\docommand

% this works, but...
%%   \doifdefined{THheight}{\Headheigth=\THheight}
%%   \doifdefined{THwidth}{\Headwidth=\THwidth}
%%   \doifdefined{THhpos}{\Headhpos=\THhpos}
%%   \doifdefined{THvpos}{\Headvpos=\THvpos}
  \doifdefinedelse{THheader}{\setvariables[Test][header=\THheader]}
  {\message{** Test header isn't defined!}}
  }


%----------------------------------------%
\starttext

\tracingmacros=2
\SetupTesthead[
  height=27mm,
  width=60mm,
  hpos=0mm,
  vpos=120mm,
  header={line 1\crlf line 2\crlf line 3},
]
\tracingmacros=0


\framed[height=\Headheigth,width=\Headwidth,align={lohi,left}]
       {\vtop{\strut\getvariable{Test}{header}\strut}}

\stoptext
%----------------------------------------%

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