On Fri, 25 Aug 2006, Aditya Mahajan wrote:
On Tue, 8 Aug 2006, Aditya Mahajan wrote:
[ A long list of feature requests ]
Here is something that was not in my original list: subformula
numbering.
[...]
I was thinking of a better (rather more familar) way of treating
subformulas by imitating the \begin{subequations} ....
\end{subeqations} environment of latex.
I propose a \startsubformula .... \stopsubformula environment, so
that inside it, I will get subformula numbers rather than formula
numbers. Having discovered conversions (see my previous mail on tagged
formulas), I tried to implement it using conversions. The following
straightforward approach works fine. This is just a stop gap code, I
do not take care of inherting the right settings for formulas, but
it conveys the idea.
Hans and Taco, can something like this be added to the core? If so, I
will try to make this macro more robust (correct inheritence, etc.)
Here is a more robust version. I use \??sf as a namespace for
subformulas. I do not think that this is used anywhere else.
Aditya
\unprotect
%D \macros{setupsubformulas}
\def\setupsubformulas
{\dodoubleargument\getparameters[\??sf]}
\definenumber
[parentformula]
[\c!text=parentformula,
\c!way=\@@fmway]
\def\subformulaconversion#1%
{\getnumber[parentformula]%
\@@sfseparator%
\convertnumber{\@@sfconversion}{#1}}
\defineconversion[subformulaconversion][\subformulaconversion]
%D \macros{startsubformulas}
\def\startsubformulas%
{\bgroup
\incrementnumber[\v!formula]
\expanded{\setupnumber[parentformula][start={\rawnumber[\v!formula]}]}
\savenumber[\v!formula]
\setupformulas[conversion=subformulaconversion,way=\@@sfway]
\resetnumber[\v!formula]}
\def\stopsubformulas%
{\restorenumber[\v!formula]
\resetlastlinewidth
\nonoindentation
\dochecknextindentation{\??sf}%
\egroup
\dorechecknextindentation} % here ?
% I have just copied the indentation checking from \stopformulas. I am not
% sure on how this works.
\setupsubformulas
[\c!way=\v!by\v!text,
\c!sectionnumber=\v!no,
\c!conversion=\v!character,
\c!separator=\@@fmseparator,
\c!indentnext=\@@fmindentnext]
\protect
%D The test cases
\startbuffer
\placeformula \startformula
a^2 + b^2 = c^2
\stopformula
\stopbuffer
\startsetups[test]
\dorecurse{3}{\getbuffer}
Lets start subformulas
\startsubformulas
\dorecurse{3}{\getbuffer}
\stopsubformulas
Also works inside alignments
\startsubformulas
\placeformula \startformula \startalign
\NC A \EQ B + C \NR[first]
\NC D \EQ E + F \NR[+]
\stopalign \stopformula
\stopsubformulas
Notice that in \in formula[first] we get the correct reference.
\dorecurse{3}{\getbuffer}
\stopsetups
\starttext
\section{Default}
\setups[test]\page
\section{Section}
\setupformulas[way=bysection]
\setups[test]\page
\section{Roman}
\setupsubformulas[conversion=romannumerals]
\setups[test]\page
\section{Separator}
\setupsubformulas[separator=-]
\setups[test]\page
\stoptext
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