[NTG-context] Problem with expansion tables (macros with variable numbers of paramaters)

23 Nov 2010

      Hello ConTeXist...

I  work on my first module (t-scancsv) which allows to process external 
CSV files.
Now I have a problem with the processing of tables that require 
expansion line data.
Unable to discover why my macro is not capable of handling the expanded 
rows.
It seems to me that the macros with variable number of parameters work 
differently from the macros with a fixed number of parameters.

I attach a minimal example of what problems occur in the processing of 
expanded lines. I need to write a macro \doloopaction with a variable 
number of parameters that would work as well as macro \doloopfromto, 
which has 3 fixed parameters. In addition, I attach a demonstration of 
the failing macro \DOLOOPFROMTO (variable number of parameters), but 
seems to me the same as the macro \doloopfromto.
Someone help me find out what the problem is??
Thanx Jaroslav

Here is my example:

\def\FirstName{\recurselevel. MyFirstName}
\def\Surname{\recurselevel. MySurname}
\def\Id{\recurselevel. MyId}

\def\lineaction{\expanded{\bTR\bTD \Id \eTD\bTD \FirstName \eTD\bTD 
\Surname \eTD\eTR}}
\def\tab{\bTR\bTD \Id \eTD\bTD \FirstName \eTD\bTD \Surname \eTD\eTR}
\def\xtab{\expanded{\bTR\bTD \Id \eTD\bTD \FirstName \eTD\bTD \Surname 
\eTD\eTR}}

\def\bT{\bTABLE\bTR\bTD ID\eTD\bTD FirstName\eTD\bTD Surname\eTD\eTR}
\def\eT{\eTABLE}

\def\doloopfromto#1#2#3{%
          \dostepwiserecurse{#1}{#2}{1}{#3}
}%

\def\doloopaction{\dotriplegroupempty\doloopAction}

\def\doloopAction#1#2#3{%
   \doifelsenothing{#1}
      {\doloopfromto{1}{10}{\lineaction}%0 par.,
      }
      {\doifelsenothing{#2}
     {\doloopfromto{1}{10}{#1}% 1 par
         }
      {\doifelsenothing{#3}
      {\doloopfromto{1}{#2}{#1}%2 par
   }
      {\doloopfromto{#2}{#3}{#1}%3 par
      }}}
}

\def\DOLOOPFROMTO{\dotriplegroupempty\DOLOOPFROMTOAction}

\def\DOLOOPFROMTOAction#1#2#3{%
   \doifelsenothing{#1}
      {%\doloopfromto{1}{10}{\lineaction}%0 par.,
      \dostepwiserecurse{1}{10}{1}{\lineaction}
      }
      {\doifelsenothing{#2}
     {%\doloopfromto{1}{10}{#1}% 1 par
         \dostepwiserecurse{1}{10}{1}{#1}
         }
      {\doifelsenothing{#3}
      {%\doloopfromto{1}{#2}{#1}%2 par
   \dostepwiserecurse{1}{#2}{1}{#1}
     }
      {%\doloopfromto{#2}{#3}{#1}%3 par
      \dostepwiserecurse{#2}{#3}{1}{#1}
      }}}
}

\starttext

1.  OK, WITHOUT EXPANSION is working as expected

\bT
\doloopfromto{1}{3}{\tab}
\eT

2. OK, with expansion is working as expected

\bT
\doloopfromto{1}{5}{\xtab}
\eT

3. OK, with expansion is working as expected

\bT
\doloopfromto{1}{5}{\lineaction}
\eT

4. OK, with expansion (lineaction macro) is working as expected

\bT
\doloopaction
\eT

5. OK, WITHOUT EXPANSION is working as expected

\bT
\doloopaction{\tab}
\eT

6. OK, WITHOUT EXPANSION is working as expected

\bT
\doloopaction{\tab}{3}
\eT

8. OK, WITHOUT EXPANSION is working as expected

\bT
\doloopaction{\tab}{3}{5}
\eT

9. ERROR, WITH EXPANSION is not working (unlike examples 2, 3, 4)

\bT
%\doloopaction{\xtab}
\eT

10. ERROR, WITH EXPANSION is not working (unlike examples 2, 3, 4)

\bT
%\doloopaction{\xtab}{3}
\eT

11. ERROR, WITH EXPANSION is not working (unlike examples 2, 3, 4)

\bT
%\doloopaction{\xtab}{3}{5}
\eT

12.  OK, WITH EXPANSION (default lineaction) is working as expected

\bT
\DOLOOPFROMTO
\eT

13. OK, WITHOUT expansion, but is working as expected

\bT
\DOLOOPFROMTO{\tab}
\eT

14.  ERROR, WITH EXPANSION is not working (unlike examples 2, 3, 4)

\bT
%\DOLOOPFROMTO{\xtab}
\eT

15.  ERROR, WITH EXPANSION is not working (unlike examples 2, 3, 4)

\bT
%\DOLOOPFROMTO{\lineaction}{4}
\eT

16.  ERROR, WITH EXPANSION is not working (unlike examples 2, 3, 4)

\bT
%\DOLOOPFROMTO{\lineaction}{4}{6}
\eT

\stoptext

[NTG-context] Problem with expansion tables (macros with variable numbers of paramaters)

Jaroslav Hajtmar