Re: [NTG-context] def with if..else fails in TABLE

18 Oct 2005

      Henning Hraban Ramm wrote:
...
Am 2005-10-18 um 10:23 schrieb Peter Rolf:
...
...
I tried to write a macro for a TABLE line:
\def\TestCmd{\dodoubleempty\doTestCmd}
\def\doTestCmd[#1][#2]#3{\bTR\bTD #3
    \iffirstargument\hfill (#1)\fi
    \eTD \bTD
    \ifsecondargument
        3: #2 and #3
    \else
        2: only #3
    \fi
    \eTD\eTR
}
But it never goes into "else" (if #2 is empty, I get "3: and #3")!
And it's only with the table commands around.
Why? What can I do?
the numbering is not bound to the parameter number; it's just a  counter.
calling the macro with two arguments ->
  \iffirstargument  is true
  \ifsecondargument is true
  \ifthirdargument  is false
sorry, my fault. you are right :)

the numbers are bound to the parameter. and \ifthirdargument is always
true (not an optional parameter).

-----

\def\TestCmd{\dodoubleempty\doTestCmd}
\def\doTestCmd[#1][#2]#3{%
  \ifsecondargument
    \iffirstargument
      3(#1/#2/#3)
    \else
      2a(#1.#2.#3)
    \fi
  \else
    \iffirstargument
      2b(#1/#2/#3)
    \else
      1(#1/#2/#3)
    \fi
  \fi
}

\starttext

\TestCmd{C}

\TestCmd[A]{C}

\TestCmd[][B]{C}

\TestCmd[A][B]{C}

\stoptext

-----
this gives

1(//C)
2b(A//C)
3(/B/C)
3(A/B/C)

thanks for the lesson ;)

Peter
...
But why *does it work* without the TABLE commands??
??? maybe an expansion problem. have you tried \expanded{\TestCmd...}
...
If it would be true (or at least the reason for my problem) what you 
wrote, the following should work:
\def\TestCmd{\dodoubleempty\doTestCmd}
\def\doTestCmd[#1][#2]#3{\bTR\bTD #3
    \ifsecondargument
        \iffirstargument\hfill (#1)\fi
        \eTD \bTD
        3(#1.#2.#3)
    \else
        \iffirstargument\hfill (#1)\fi
        \eTD \bTD
        2(#1/#2/#3)
    \fi
    \eTD\eTR
}
But there I get only a
! Incomplete \iftrue; all text was ignored after line 63.
<inserted text>
                \fi
Grüßlis vom Hraban!
---
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http://www.cacert.org (I'm an assurer)
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