%D \module
%D   [       file=publ-imp-page,
%D        version=2014.11.05,
%D          title=\CONTEXT\ Publication Support,
%D       subtitle=Page numbers,
%D         author=Alan Braslau and Hans Hagen,
%D           date=\currentdate,
%D      copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.

\unprotect

\definebtx
  [\s!page] % or just outer level
  [\c!pagestate=\v!stop,
   \c!pageleft=\btxleftparenthesis, % see below!!
   \c!pageright=\btxrightparenthesis,
   \c!pagesep={,\space},
   \c!lastpagesep={,\space\btxlabeltext{\currentbtxspecification:and}\space},
   \c!finalpagesep={\space\btxlabeltext{\currentbtxspecification:and}\space},
   \c!pageconnector=\endash]

\definebtx
  [\s!page:\s!list]
  [\s!page]
  [\c!command={\wordright}]

\startsetups \s!btx:\s!page:concat
    \ifcase\currentbtxoverflow
        \ifcase\currentbtxconcat
        \or % first
        \or % second
            \btxparameter\c!pagesep
        \or % second of two
            \btxparameter\c!lastpagesep
        \or % last
            \btxparameter\c!finalpagesep
        \fi
    \fi
\stopsetups

% for the moment we have only one variant

\startsetups [\s!btx:\s!page:\s!list]
    \fastsetup{\s!btx:\s!page:concat}
  % \ifx\currentbtxlastpage\empty
  %     p.
  % \else
  %     pp.
  % \fi
  % \btxnbsp
    \ifconditional\btxinteractive
        \goto {
            \currentbtxfirstpage
        } [
            internal(\currentbtxfirstinternal)
        ]
        \ifx\currentbtxlastpage\empty \else
            \btxparameter\c!pageconnector
            \goto {
                \currentbtxlastpage
            } [
                internal(\currentbtxlastinternal)
            ]
        \fi
    \else
        \currentbtxfirstpage
        \ifx\currentbtxlastpage\empty \else
            \btxparameter\c!pageconnector
            \currentbtxlastpage
        \fi
    \fi
\stopsetups

\protect