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%D \module
%D [ file=level,
%D version=2002.10.20,
%D title=\CONTEXT\ Extra Modules,
%D subtitle=Catching Nesting Errors,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright=\PRAGMA]
%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
\newcount\currentnesting
\def\startnesting#1%
{\global\advance\currentnesting\plusone
\setxvalue{level::\number\currentnesting}{#1}}
\def\stopnesting#1%
{\edef\nestingstring{#1}%
\relax\ifnum\currentnesting>\zerocount
\doifelsevalue{level::\number\currentnesting}\nestingstring
{\global\advance\currentnesting\minusone}
{\@EA\reportnestingerror\@EA\stoptext}
\else
\@EA\reportnestingerror\@EA\stoptext
\fi}
\def\checknesting
{\relax\ifnum\currentnesting>\zerocount
\def\nestingstring{end of document}%
\@EA\reportnestingerror
\fi}
\def\reportnestingerror
{\endgraf
\global\let\checknesting\relax
\bgroup \definedfont[Mono at 18pt]\incolortrue
\setupinterlinespace
\raggedright
\bgroup \red
\ifnum\currentnesting>\plusone
wrong end level
\else
too many end levels
\fi
at \nestingstring\space in line \number\inputlineno
\ifnum\currentnesting>\zerocount, stack:\fi\endgraf
\egroup
\dostepwiserecurse\currentnesting\plusone\minusone
{\space\getvalue{level::\recurselevel}}
\endgraf
\egroup
\writestatus\m!systems{quitting due to level error}\wait
\batchmode}
\prependtoks
\checknesting
\to \everystoptext
\protect \doifnotmode{demo}{\endinput}
\starttext
% \startnesting{eerste}
% \startnesting{tweede}
% \startnesting{derde}
% \startnesting{vierde}
% test
% \stopnesting{vierde}
% \stopnesting{eerste}
% \startnesting{eerste}
% \startnesting{tweede}
% test
% \stopnesting{vierde}
% \stopnesting{derde}
% \stopnesting{tweede}
% \stopnesting{eerste}
\startnesting{eerste}
\startnesting{tweede}
\startnesting{derde}
\startnesting{vierde}
test
\stopnesting{vierde}
\stopnesting{derde}
\stopnesting{tweede}
\stopnesting{eerste}
\stoptext
|
