%% cloze.sty
%% 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.

\NeedsTeXFormat{LaTeX2e}[1999/12/01]
\ProvidesPackage{cloze}
    [2025/06/06 v1.7.0 Package to typeset cloze worksheets or cloze tests]
%
% \subsection{The file \tt{cloze.sty}}
%
%    \begin{macrocode}
\input{cloze.tex}
%    \end{macrocode}
%
%    \begin{macrocode}
\ExplSyntaxOn
%    \end{macrocode}
%
% This packages are used to build \emph{cloze}:
%
% \subsubsection{Dependencies}
%
% The package \href{https://www.ctan.org/pkg/setspace}{setspace} is used
% by the environment |clozespace|.
%    \begin{macrocode}
\RequirePackage{setspace}
%    \end{macrocode}
%
% The package \href{https://www.ctan.org/pkg/xcolor}{xcolor} is required
% to colorize the text and the line of a gap.
%    \begin{macrocode}
\RequirePackage{xcolor}
%    \end{macrocode}
%
% The package \href{https://www.ctan.org/pkg/stackengine}{stackengine}
% is required by the command |\clozestrike{}{}|.
%    \begin{macrocode}
\RequirePackage{stackengine}
%    \end{macrocode}
%
% The package \href{https://www.ctan.org/pkg/ulem}{ulem} is required by
% the command |\clozestrike{}{}|.
%    \begin{macrocode}
\RequirePackage{ulem}
\normalem
%    \end{macrocode}
%
%    \begin{macrocode}
\RequirePackage{transparent}
%    \end{macrocode}
%
%    \begin{macrocode}
\DeclareOption*{} % suppresses the error message: ! LaTeX Error: Unknown option
\ProcessOptions\relax
\RequirePackage{luakeys}
\directlua{
  cloze.parse_options('\LuakeysGetPackageOptions', 'global')
}
%    \end{macrocode}
%
% Overwrite the cloze font definition in the plain tex definition to
% avoid undefined old font command errors. In plain \TeX{} we use \cmd{\it}.
%    \begin{macrocode}
\def\clozefont{\itshape}
%    \end{macrocode}
%
% Load the cloze lua module and put all return values in the variable
% |cloze|.
%
% \begin{macro}{\clozesetoption}
% \cmd{\clozesetoption} is a wrapper for the Lua function
% |registry.set_option|. \cmd{\clozesetoption}\marg{key}\marg{value}
% sets a key \meta{key} to the value \meta{value}. The plain Lua\TeX{}
% version always sets to the global options. The Lua\LaTeX-version
% can set values both to the local and the global options store.
%    \begin{macrocode}
\let\clozesetoption=\undefined
\newcommand{\clozesetoption}[2]
{
  \directlua{cloze.set_option('#1', '#2')}
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\ClozeSetLocalOptions}
% This macro is used in all cloze commands to handle the optional
% arguments.
%    \begin{macrocode}
\def\ClozeSetLocalOptions#1
{
  \directlua
  {
    cloze.parse_options('#1', 'local')
  }
}
%    \end{macrocode}
% \end{macro}
%
% \subsubsection{Options}
%
% At start all values are declared as global options. At the Lua side
% all values are now stored in the |registry.global_options| table.
%
%    \begin{macrocode}
\ClozeSetToGlobal
%    \end{macrocode}
%
% \subsubsection{Public macros}
%
% All public macros are prefixed with |\cloze|.
%
% \begin{macro}{\clozeset}
% The usage of the command \cmd{\clozeset} is described in detail in
% section \TmpSecRef{sec:command-clozeset}.
%    \begin{macrocode}
\newcommand{\clozeset}[1]
{
  \directlua
  {
    cloze.parse_options('#1', 'global')
  }
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\clozeshow}
% The usage of the command \cmd{\clozeshow} is described in detail in
% section \TmpSecRef{sec:command-clozeshow}.
%    \begin{macrocode}
\let\clozeshow=\undefined
\newcommand{\clozeshow}{%
  \clozeset{show}
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\clozehide}
% The usage of the command \cmd{\clozehide} is described in detail in
% section \TmpSecRef{sec:command-clozehide}.
%    \begin{macrocode}
\let\clozehide=\undefined
\newcommand{\clozehide}
{
  \clozeset{hide}
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\cloze}
% The usage of the command \cmd{\cloze} is described in detail in
% section \TmpSecRef{sec:command-cloze}.
%    \begin{macrocode}
\let\clozePLAIN=\cloze
\let\cloze=\undefined
\newcommand{\cloze}[2][]
{
  \ClozeSetLocalOptions{#1}
  \clozePLAIN{#2}
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\clozefix}
% The usage of the command \cmd{\clozefix} is described in detail in
% section \TmpSecRef{sec:command-clozefix}.
%    \begin{macrocode}
\let\clozefixPLAIN=\clozefix
\let\clozefix=\undefined
\newcommand{\clozefix}[2][]
{
  \ClozeSetLocalOptions{#1}
  \clozefixPLAIN{#2}
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\clozenol}
% The usage of the command \cmd{\clozenol} is described in detail in
% section \TmpSecRef{sec:command-clozenol}.
%    \begin{macrocode}
\let\clozenolPLAIN=\clozenol
\let\clozenol=\undefined
\newcommand{\clozenol}[2][]
{
  \ClozeSetLocalOptions{#1}
  \clozenolPLAIN{#2}
}
%    \end{macrocode}
% \end{macro}
%
% \begin{environment}{clozepar}
% The usage of the environment |clozepar| is described in detail in
% section \TmpSecRef{sec:command-clozepar}.
%    \begin{macrocode}
\newenvironment{clozepar}[1][]
{
  \par
  \ClozeSetLocalOptions{#1}
  \ClozeStartMarker{par}
  \clozefont\relax
}
{
  \ClozeStopMarker{par}
  \par
  \directlua{cloze.unregister_callback('par')}
}
%    \end{macrocode}
% \end{environment}
%
%
% \begin{macro}{\clozeparplain}
% The usage of the command \cmd{\clozeparplain} is described in detail in
% section \TmpSecRef{sec:command-clozeparplain}.
%    \begin{macrocode}
\let\clozeparplainPLAIN=\clozeparplain
\let\clozeparplain=\undefined
\newcommand{\clozeparplain}[2][]
{
  \ClozeSetLocalOptions{#1}
  \clozeparplainPLAIN{#2}
}
%    \end{macrocode}
% \end{macro}
%
% \begin{environment}{clozebox}
% The usage of the environment |clozebox| is described in detail in
% section \TmpSecRef{sec:command-clozebox}.
% For the box rule a \cmd{\fbox} is used. We store the original rule
% thickness and restore the dimension after the clozebox is set.
% The dimension |fboxrule| have to be set before the environment
% |lrbox|.
%    \begin{macrocode}
\newsavebox{\ClozeBox}
\NewDocumentEnvironment{clozebox}{ s O{} +b }
{
  \directlua
  {
    cloze.print_box('\luaescapestring{\unexpanded{#3}}','\luaescapestring{\unexpanded{#2}}','\luaescapestring{\unexpanded{#1}}')
  }
}
{
  \directlua
  {
    cloze.restore_fboxrule()
  }
}
%    \end{macrocode}
% \end{environment}
%
% \begin{environment}{clozespace}
% The usage of the environment |clozespace| is described in detail in
% section \TmpSecRef{sec:command-clozespace}.
% TODO: Realization without setspace package.
%    \begin{macrocode}
\NewDocumentEnvironment { clozespace } { O {} }
{
  \directlua{cloze.print_space('#1')}
}
{
  \end{spacing}
}
%    \end{macrocode}
% \end{environment}
%
% \begin{macro}{\clozeline}
% The usage of the command \cmd{\clozeline} is described in detail in
% section \TmpSecRef{sec:command-clozeline}.
%    \begin{macrocode}
\let\clozelinePLAIN=\clozeline
\let\clozeline=\undefined
\newcommand{\clozeline}[1][]
{
  \ClozeSetLocalOptions{#1}
  \clozelinePLAIN
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\clozelinefil}
% The usage of the command \cmd{\clozelinefil} is described in detail in
% section \TmpSecRef{sec:command-clozelinefil}.
%    \begin{macrocode}
\let\clozelinefilPLAIN=\clozelinefil
\let\clozelinefil=\undefined
\newcommand{\clozelinefil}[1][]
{
  \ClozeSetLocalOptions{#1}
  \clozelinefilPLAIN
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\clozefil}
% The usage of the command \cmd{\clozefil} is described in detail in
% section \TmpSecRef{sec:command-clozefil}.
%    \begin{macrocode}
\let\clozefil=\undefined
\newcommand{\clozefil}[2][]
{
  \cloze[#1]{#2}\clozelinefil[#1]
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\clozeextend}
% TODO: Use node library to create kern nodes.
%    \begin{macrocode}
\newcommand{\clozeextend}[1][1]
{
  \directlua
  {
    cloze.print_extension('#1')
  }
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\ClozeTextColor}
%    \begin{macrocode}
\newcommand{\ClozeTextColor}[1]
{
  \FarbeTextColor{blue}{#1}
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\ClozeStrikeLine}
%    \begin{macrocode}
\newcommand\ClozeStrikeLine
{
  \bgroup
  \markoverwith{
    \ClozeTextColor{
      \rule[0.5ex]{2pt}{1pt}
    }
  }
  \ULon
}
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\clozestrike}
%    \begin{macrocode}
\newcommand{\clozestrike}[3][]{%
  \ClozeSetLocalOptions{#1}%
  \ifclozeshow%
    \stackengine%
      {\Sstackgap}% \Sstackgap or \Lstackgap or \stackgap or stacklength
      {\ClozeStrikeLine{#2}}% anchor
      {\ClozeTextColor{\clozefont{}#3}}% item
      {O}% O or U
      {c}% \stackalignment or l or c or r
      {\quietstack}% \quietstack or T or F
      {T}% \useanchorwidth or T or F
      {\stacktype}% \stacktype or S or L
  \else%
    \stackengine%
      {\Sstackgap}% \Sstackgap or \Lstackgap or \stackgap or stacklength
      {#2}% anchor
      {\texttransparent{0}{\clozefont{}#3}}% item
      {O}% O or U
      {c}% \stackalignment or l or c or r
      {\quietstack}% \quietstack or T or F
      {T}% \useanchorwidth or T or F
      {\stacktype}% \stacktype or S or L
  \fi%
}
%    \end{macrocode}
% \end{macro}
%
%    \begin{macrocode}
\ExplSyntaxOff
%    \end{macrocode}