%D \module
%D   [       file=math-del,
%D        version=2007.07.19,
%D          title=\CONTEXT\ Math Macros,
%D       subtitle=Delimiters,
%D         author=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.

\writestatus{loading}{ConTeXt Math Macros / Delimiters}

\unprotect

%D Old code that will be redone:
%D
%D \macros
%D   {checkdelimiters, fakeleftdelimiter, fakerightdelimiter}
%D
%D Handy for non matching situations (as with mathml):
%D
%D \starttyping
%D \checkdelimiters{... bla bla ...}
%D \fakeleftdelimiter
%D  ... bla bla ...
%D \fakerightdelimiter
%D \stoptyping

% Actually we can do better now with lua hacks.

\newcount\c_math_delimiter_nesting

\def\leftfakedelimiter {\advance\c_math_delimiter_nesting\minusone\gobbleoneargument}
\def\rightfakedelimiter{\advance\c_math_delimiter_nesting\plusone \gobbleoneargument}

\def\checkdelimiters#1%
  {\c_math_delimiter_nesting\zerocount
   \setbox\scratchbox\hbox\bgroup
     \let\left \leftfakedelimiter
     \let\right\rightfakedelimiter
     $#1\expandafter$\expandafter
   \egroup
   \expandafter\c_math_delimiter_nesting\the\c_math_delimiter_nesting\relax}

\def\fakeleftdelimiter {\ifnum\c_math_delimiter_nesting>\zerocount\left .\fi}
\def\fakerightdelimiter{\ifnum\c_math_delimiter_nesting<\zerocount\right.\fi}

%D The following macros are used in the MathML interpreter, so
%D there is a good change of them never being documented for
%D other usage.

\let\normalordelimiter\secondoftwoarguments
\let\normalorfiller   \firstoftwoarguments

\unexpanded\def\enabledelimiter {\let\normalordelimiter\secondoftwoarguments}
\unexpanded\def\disabledelimiter{\let\normalordelimiter\firstoftwoarguments}

\unexpanded\def\enablefiller    {\let\normalorfiller\secondoftwoarguments}
\unexpanded\def\disablefiller   {\let\normalorfiller\firstoftwoarguments}

\def\mathopnolimits#1{\mathop{\mr#1}\nolimits} % was \rm, which follows text fonts (used in mml parser)
\def\mathopdolimits#1{\mathop{\mr#1}}          % was \rm, which follows text fonts (used in mml parser)

\protect \endinput
