On 2018-01-31 01:04, Wolfgang Schuster wrote:
Rik Kabel <mailto:cont...@rik.users.panix.com>
31. Januar 2018 um 03:10
Listers,
I have a problem, and a question on ConTeXt programming efficiency.
In the example below, I have a set of variables. When these are
reference directly via \getvariable, everything works as expected in
simple text and in TABLEs. When I \define a macro to the
\getvariable, that works in simple text, but only the value of the
last iteration appears in the TABLE. The macro definition is saved
and when it is used, that is the value that it has.
So, how can I \define (or \def, ...) a macro to the expanded value to
avoid this? That is the problem.
The question is, Is there is any advantage to be had in doing this?
Assume that the value is referenced many (tens of) times. There seems
to be an aesthetic value of factoring out the multiple identical
instances of the \getvariable syntax and assigning a more
semantically informative name, but beyond that, is there any other value?
Natural tables collect the content of all cells to perform the width
and height calculations
and you have to expand the content of the cells to get the current
value of \getvariable.
\starttexdefinition unexpanded doTableRow #SET
\bTR
\expanded{\bTC\getvariable{#SET}{a}\eTC}
\expanded{\bTC\getvariable{#SET}{b}\eTC}
\eTR
\stoptexdefinition
BTW: You can use the \processcommacommand command when you save your
lists in a macro (no need for \expandafter).
\defineexpandable\Sets{one,two}
\processcommacommand[\Sets]\doInlineTextExp
Wolfgang
Thank you for the help and the processcommacommand bit. However, the
problem is still there (and I was just wrong in my own follow-up).
Below is an updated example with and without the \expanded{\bTC...
It does not seem to make a difference here, but perhaps it is needed in
some situations.
My question is about factoring the \getvariable out of the \bTC rows (in
this example) and \defining a simpler macro to hold the value. Should it
be done, and if so, how?
% macros=mkvi engine=luajittex
\setvariables [one]
[a=1aaaaaaaa,b=1b,c=1c]
\setvariables [two]
[a=2a,b=2bbbbbbbbbbbbbbbb,c=2c]
\defineexpandable \Sets
{one,two}
\starttexdefinition unexpanded doInlineText #SET
Direct: \getvariable{#SET}{a} \getvariable{#SET}{b}\
\getvariable{#SET}{c}\par
\stoptexdefinition
\starttexdefinition unexpanded doTableRow #SET
\bTR
\bTC\getvariable{#SET}{a}\eTC
\bTC\getvariable{#SET}{b}\eTC
\bTC\getvariable{#SET}{c}\eTC
\eTR
\stoptexdefinition
\starttexdefinition doInlineTextExpA #SET
\define\A{\getvariable{#SET}{a}}
\define\B{\getvariable{#SET}{b}}
\define\C{\getvariable{#SET}{c}}
Factored A: \A\ \B\ \C\par
\stoptexdefinition
\starttexdefinition doTableRowExpA #SET
\define\A{\getvariable{#SET}{a}}
\define\B{\getvariable{#SET}{b}}
\define\C{\getvariable{#SET}{c}}
\bTR
\bTC\A\eTC
\bTC\B\eTC
\bTC\C\eTC
\eTR
\stoptexdefinition
\starttexdefinition doInlineTextExpB #SET
\define\A{\getvariable{#SET}{a}}
\define\B{\getvariable{#SET}{b}}
\define\C{\getvariable{#SET}{c}}
Factored B: \A\ \B\ \C\par
\stoptexdefinition
\starttexdefinition doTableRowExpB #SET
\define\A{\getvariable{#SET}{a}}
\define\B{\getvariable{#SET}{b}}
\define\C{\getvariable{#SET}{c}}
\bTR
\expanded{\bTC\A\eTC}
\expanded{\bTC\B\eTC}
\expanded{\bTC\C\eTC}
\eTR
\stoptexdefinition
\starttext
\processcommacommand[\Sets]\doInlineText
\bTABLE[frame=off]
\bTABLEhead
\bTR[nc=2]
\bTH Direct\eTH
\eTR
\eTABLEhead
\bTABLEbody
\processcommacommand[\Sets]\doTableRow
\eTABLEbody
\eTABLE
\processcommacommand[\Sets]\doInlineTextExpA
\bTABLE[frame=off]
\bTABLEhead
\bTR[nc=2]
\bTH Factored A\eTH
\eTR
\eTABLEhead
\bTABLEbody
\processcommacommand[\Sets]\doTableRowExpA
\eTABLEbody
\eTABLE
\processcommacommand[\Sets]\doInlineTextExpB
\bTABLE[frame=off]
\bTABLEhead
\bTR[nc=2]
\bTH Factored B\eTH
\eTR
\eTABLEhead
\bTABLEbody
\processcommacommand[\Sets]\doTableRowExpB
\eTABLEbody
\eTABLE
\stoptext
--
RIk
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the
Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://context.aanhet.net
archive : https://bitbucket.org/phg/context-mirror/commits/
wiki : http://contextgarden.net
___________________________________________________________________________________
