%% cloze.tex
%% Copyright 2015-2025 Josef Friedrich
%
% This work may be distributed and/or modified under the
% conditions of the LaTeX Project Public License, either version 1.3c
% of this license or (at your option) any later version.
% The latest version of this license is in
%   http://www.latex-project.org/lppl.txt
% and version 1.3c or later is part of all distributions of LaTeX
% version 2008/05/04 or later.
%
% This work has the LPPL maintenance status `maintained'.
%
% The Current Maintainer of this work is Josef Friedrich.
%
% This work consists of the files cloze.lua, cloze.tex,
% and cloze.sty.

% \subsection{The file \tt{cloze.tex}}
%
% The cloze package uses following naming conventions: Internal / private
% macros / commands / envirnoments are written in PascalCase, public
% ones are written in lowercase. Earlier versions of this package used
% @ characters for private macros. The lower level / private macros
% are now defined in the plain Lua\TeX{} version of the package and
% used to set cloze text in plain Lua\TeX{}.
%
%    \begin{macrocode}
\directlua{
  cloze = require('cloze')
  cloze.register_functions()
}
%    \end{macrocode}
%
%    \begin{macrocode}
\input farbe.tex
%    \end{macrocode}
%
% \subsubsection{Internal macros}
%
% \begin{macro}{\ClozeGetOption}
% This macro is used in the documentation to show the default values
% of some options.
%    \begin{macrocode}
\def\ClozeGetOption#1{%
  \directlua{
    tex.print(cloze.get_option('#1'))
  }%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\ClozeStartMarker}
% At the begining |\ClozeStartMarker| registers the required Lua
% callbacks. Then it inserts a whatsit marker which marks the begin of a
% gap.
%    \begin{macrocode}
\def\ClozeStartMarker#1#2{%
  \strut\directlua{
    cloze.initialize_cloze('#1', '\luaescapestring{#2}')
  }%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\ClozeStopMarker}
% \cmd{\ClozeStopMarker} inserts a whatsit marker that marks the end
% of gap.
%    \begin{macrocode}
\def\ClozeStopMarker#1{%
  \strut\directlua{
    cloze.write_marker('#1', 'stop')
  }%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\ClozeWrapWithFont}
% \cmd{\ClozeWrapWithFont} wraps the text with the font definition.
%    \begin{macrocode}
\def\ClozeWrapWithFont#1{%
  {%
    \directlua{cloze.print_font()}\relax%
    #1%
  }%
}%
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\ClozeMargin}
% \cmd{\ClozeMargin} surrounds a text in a gap with two |kerns|.
%    \begin{macrocode}
\def\ClozeMargin#1{%
  \directlua{cloze.write_margin_node()}%
  #1%
  \directlua{cloze.write_margin_node()}%
}
%    \end{macrocode}
% \end{macro}
%
% \subsubsection{Public plain \TeX{} macros}
%
% \begin{macro}{\clozeset}
%    \begin{macrocode}
\def\clozeset#1{%
  \directlua
  {
    cloze.parse_global_options('\luaescapestring{\unexpanded{#1}}')
  }%
}
%    \end{macrocode}
% \end{macro}
%
%
% \begin{macro}{\clozereset}
%    \begin{macrocode}
\def\clozereset{%
  \directlua{cloze.reset()}%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\clozeshow}
%    \begin{macrocode}
\def\clozeshow{%
  \clozeset{show}%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\clozehide}
%    \begin{macrocode}
\def\clozehide{%
  \clozeset{hide}%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\clozefont}
%    \begin{macrocode}
\def\clozefont{\it}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\clozesetfont}
%    \begin{macrocode}
\def\clozesetfont#1{%
  \def\clozefont{%
    #1%
  }%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\Cloze}
% \cmd{\Cloze}\marg{cloze-type}\marg{kv-string}\marg{text}
%    \begin{macrocode}
\def\Cloze#1#2#3{%
  \ClozeStartMarker{#1}{#2}%
  \ClozeWrapWithFont{%
    \ClozeMargin{#3}%
  }%
  \ClozeStopMarker{#1}%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\ClozeLine}
% This is the plain Lua\TeX-Version of the macro \cmd{\clozeline}.
%    \begin{macrocode}
\def\ClozeLine#1{%
  \directlua{
    cloze.parse_local_options('\luaescapestring{#1}')
    cloze.write_line_nodes()
  }%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\ClozeLinefil}
% This is the plain Lua\TeX-Version of the macro \cmd{\clozelinefil}.
%    \begin{macrocode}
\def\ClozeLinefil#1{%
  \strut%
  \directlua{
    cloze.parse_local_options('\luaescapestring{#1}')
    cloze.write_linefil_nodes()
  }%
  \strut%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\ClozeFil}
% This is the plain Lua\TeX-Version of the macro \cmd{\clozefil}.
%    \begin{macrocode}
\def\ClozeFil#1#2{%
  \Cloze{basic}{#1}{#2}\ClozeLinefil{#1}%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\ClozeStrike}
%    \begin{macrocode}
\def\ClozeStrike#1#2#3{%
  \ClozeStartMarker{strike}{#1}%
  \vbox{\hbox{\kern0pt\ClozeWrapWithFont{#3}}\hbox{#2}}%
  \ClozeStopMarker{strike}%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\ClozePar}
% \cmd{\ClozePar}\marg{kv-string}\marg{text}
%    \begin{macrocode}
\def\ClozePar#1#2{%
  \par%
  \ClozeStartMarker{par}{#1}%
  \ClozeWrapWithFont{#2}%
  \ClozeStopMarker{par}%
  \par%
  \directlua{cloze.unregister_callback('par')}%
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\clozeparcapture}
%    \begin{macrocode}
\def\clozeparcapture#1\par {%
  \ClozePar{}{#1}%
}
\let\clozeparcmd=\clozeparcapture
%    \end{macrocode}
% \end{macro}

% \begin{macro}{\ClozeExtend}
% TODO: Use node library to create kern nodes.
%    \begin{macrocode}
\def\ClozeExtend#1{%
  \directlua
  {
    cloze.print_extension('\luaescapestring{#1}')
  }%
}
%    \end{macrocode}
% \end{macro}