Definition of \registerpagerange

Definition of \registerpagerange

[Hynek, Stefan]

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Hello fellow ConTeXies, 

since April 2019 it is possible to use \setupregister with
compress=text which is a fine addition and has its use cases.
Unfortunately, I am confronted with the demand to style the registers
with 'f.' for a following single page and else with page ranges. Since
the Definition of \registerpagerange is not well documented I don't
know which parameter to check for the conditional statement when
rewriting it. Could you please give me a hint? 

In ConTeXt that shipped with TeXlive 2015 it worked that way:
\unexpanded\def\registerpagerange#1#2#3#4#5#6#7%
    {\registerpageseparator
     \global\setconstant\c_strc_registers_page_state\plusone
     \dostarttagged\t!registerpagerange\empty
     \dostarttagged\t!registerfrompage\empty
     \withregisterpagecommand{#1}{#2}{#3}{#4}%
     \dostoptagged
     \ifnum\the\numexpr#6-#3\relax=1
       f.%
     \else
       \registeronepagerangeseparator
       \dostarttagged\t!registertopage\empty
       \withregisterpagecommand{#1}{#5}{#6}{#7}%
       \dostoptagged
     \fi
     \dostoptagged}

With best regards
Stefan

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Re: Definition of \registerpagerange

[Henning Hraban Ramm]

> Am 05.05.2020 um 10:35 schrieb Hynek, Stefan <stefan.hynek@uni-goettingen.de>:
> 
> Hello fellow ConTeXies, 
> 
> since April 2019 it is possible to use \setupregister with
> compress=text which is a fine addition and has its use cases.
> Unfortunately, I am confronted with the demand to style the registers
> with 'f.' for a following single page and else with page ranges. Since
> the Definition of \registerpagerange is not well documented I don't
> know which parameter to check for the conditional statement when
> rewriting it. Could you please give me a hint? 


This doesn’t answer your question, but I found:

\setupregister[index][compress=yes] % 14, 15 becomes 14-15
\setupregister[index][compress=text] % 14, 15 becomes 14f.

To change the "f."/"ff." text, you’d use:

\setuplabeltext[de][following:singular=sq.,following:plural=sqq.]

This is defined in tex/context/base/mkiv/lang-txt.lua
and addressed in context/base/mkiv/strc-reg.mkiv in the definition of \registerpagerange:

\unexpanded\def\registerpagerange#1#2#3#4#5#6#7#8% #1:class #2:processor  content, content todo: -- configurable
  {\pushcurrentregister{#1}%
   \edef\p_pagenumber{\registerparameter\c!pagenumber}%
   \ifx\p_pagenumber\v!no\else
     \registerpageseparator
     \global\setconstant\c_strc_registers_page_state\plusone
     \dostarttagged\t!registerpagerange\empty
     \dostarttagged\t!registerfrompage\empty
     \withregisterpagecommand{#2}{#3}{#4}{#5}%
     \dostoptagged
     \ifconditional\c_strc_registers_following
       \ifnum#3=\numexpr#6-1\relax
         \labeltext{following:\s!singular}%
       \else
         \labeltext{following:\s!plural}%
       \fi
    \else
       \registeronepagerangeseparator
       \dostarttagged\t!registertopage\empty
       \withregisterpagecommand{#2}{#6}{#7}{#8}%
     \fi
     \dostoptagged
     \dostoptagged
   \fi
   \popcurrentregister}

(see https://source.contextgarden.net/tex/context/base/mkiv/strc-reg.mkiv?search=singular)


You should be able to combine the two "else" branches.

HTH
Hraban
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