\PassOptionsToPackage{full}{textcomp}
\documentclass[exfoo=value, exbar, exfoo=\empty]{l3doc}

% preamble >>=
\makeatletter
\let\save@onlypreamble\@onlypreamble
\let\@onlypreamble\@gobble
\usepackage[all]{expkv}
\let\@onlypreamble\save@onlypreamble
\makeatother
\usepackage[oldstylenums,nott]{kpfonts}
\input{glyphtounicode}
\pdfgentounicode=1
\usepackage{xfp} % required for an example
\usepackage{booktabs}
\usepackage{array}
\usepackage{collcell}
\usepackage{siunitx}
\DeclareSIUnit\ops{ops}
\usepackage{xcolor}
\usepackage{caption}
\usepackage{microtype}
\usepackage{accsupp}
\usepackage{enumitem}
\usepackage{randtext}

\usepackage{tcolorbox}%>>=
\newtcolorbox{exresult}[2][]
  {%
     colback=ekvgrey!10!white%
    ,colframe=ekvgrey%
    ,fontupper=\small
    ,width={\dimexpr#2\relax}%
    ,#1%
  }
\newtcbox\exres[1][]
  {
     colback=ekvgrey!10!white
    ,colframe=ekvgrey
    ,size=small
    ,nobeforeafter
    ,tcbox raise base
    ,fontupper=\small
    ,#1
  }
%=<<

\usepackage{listings}%>>=
\input{preamble-lst.tex}
%=<<

\let\metaORIG\meta
\protected\def\meta #1{\texttt{\metaORIG{#1}}}

\input{preamble-examples.tex}
\input{preamble-logos.tex}

\makeatletter
% shortcuts >>=
\newcommand\Vkey{\texttt{Val}-\key}
\newcommand*\Nkey{\texttt{NoVal}-\key}
\newcommand\kv{\meta{key}=\penalty2000\meta{value}}
\newcommand\kvarg{\{\kv, \ldots\}}
\newcommand\key{\meta{key}}
\newcommand\val{\meta{value}}
\newcommand\set{\meta{set}}
\newcommand\prefix{\texorpdfstring{\textit{prefix}}{prefix}}
\newcommand\prefixes{\textit{prefixes}}
\newcommand\type{\texorpdfstring{\textit{type}}{type}}
\newcommand\types{\textit{types}}
\newcommand\tkn[2]{\texttt{\char`#1}\textsubscript{#2}}
\newcommand\expansion{\meta{expansion}}
%\newcommand\expnotation{}
%\edef\expnotation
  %{\noexpand\texttt{exp\string|}\penalty\@M-\hskip\z@skip notation}
\newcommand\singlecs[1]
  {%
    The \meta{cs} should be a single control sequence, such as
    \cs[no-index]{#1}. \ignorespaces
  }
\newcommand\ekvdocsection[8]
  {%
    \clearpage
    \chardef\ekvdoc@insection1
    \section[{#7}]%
      {%
        #7%
        \hfill
        \begingroup\scriptsize\ttfamily
          \begin{tabular}{@{}r@{}l@{}}%
            #1{\string\input\{expkv#8\}}      & \rlap{#2{\ \% plain}}\\
            #3{\string\usepackage\{expkv#8\}} & \rlap{#4{\ \% LaTeX}}\\
            #5{\string\usemodule[expkv#8]}    & \rlap{#6{\ \% ConTeXt}}\\
          \end{tabular}%
        \endgroup
        \label{sec:expkv#8}%
      }%
    \chardef\ekvdoc@insection0
  }
\chardef\ekvdoc@insection0
\newcommand*\genericekv
  {\ekvdocsection{}{\textcolor{gray}}{}{\textcolor{gray}}{}{\textcolor{gray}}}
\newcommand*\latexekv
  {\ekvdocsection\phantom\phantom{}{\textcolor{gray}}\phantom\phantom}
%=<<

\hypersetup{linkcolor=red!80!black,urlcolor=purple!80!black}

\input{preamble-prefixes.tex}
\input{preamble-noidx.tex}
\input{preamble-enverb.tex}

% vissp >>=
\ExplSyntaxOn
\cs_new_protected:Npn \vissp #1
  {
    \group_begin:
      \tl_set:Nn \l_tmpa_tl {#1}
      \tl_replace_all:Nnn \l_tmpa_tl { ~ } { \asciispace }
      \l_tmpa_tl
    \group_end:
  }
\ExplSyntaxOff
% =<<

\ekvcSplit\expkvorules% >>=
  {
     cd = \emph{nothing}
    ,cu = \emph{nothing}
    ,pd = \emph{nothing}
    ,pu = \emph{nothing}
  }
  {%
    \begin{description}
      \item[Class:]
        \begin{description}
          \item[defined]   #1
          \item[undefined] #2
        \end{description}
      \item[Package:]
        \begin{description}
          \item[defined]   #3
          \item[undefined] #4
        \end{description}
    \end{description}%
  }
\ekvcSecondaryKeys\expkvorules
  {
     meta d = {cd={#1},pd={#1}}
    ,meta u = {cu={#1},pu={#1}}
  }% =<<

\newcommand*\pmso[1] % poor man's strike out%>>=
  {%
    \leavevmode
    \begingroup
      \sbox0{#1}%
      \rlap{\vrule height .6ex depth -.5ex width \wd0\relax}%
      \usebox0\relax
    \endgroup
  }%=<<

\@ifdefinable\gobbledocstriptag{\def\gobbledocstriptag#1>{}}

\renewcommand*\partname{Part}

% \addsec and friends >>=
\newcommand*\addsec@[2]
  {%
    \c@secnumdepth=%
    \expanded
      {%
        \m@ne
        \unexpanded{#1{#2}}%
        \c@secnumdepth=\the\c@secnumdepth\relax
      }%
  }
\newcommand*\addsec  {\addsec@\section}
\newcommand*\addssec {\addsec@\subsection}
\newcommand*\addsssec{\addsec@\subsubsection}
% =<<

\newenvironment{syntaxexample}% >>=
  {%
    \quote
    \ttfamily\small\frenchspacing
    \parskip=\z@
    \def\indent{\leavevmode\phantom{mm}}%
  }
  {\endquote}
\newenvironment{syntaxexample*}
  {\syntaxexample\obeylines}
  {\endsyntaxexample}% =<<

\newcommand\expkvdocPrintErrors[1][]
  {%
    \protected\long\def\expkvdoc@errfont##1%
      {\texttt{\frenchspacing\textcolor{red!80!black}{##1}}}%
    \protected\long\def\ekv@err@collect##1\par##2%
      {\expkvdoc@errfont{! \detokenize{##2} Error: ##1}#1}%
    \protected\long\def\expkvdoc@errm##1##2%
      {\expkvdoc@errfont{! expkv##1 Error: ##2}#1}%
    \def\ekv@errm{\expkvdoc@errm{}}%
    \def\ekvc@errm{\expkvdoc@errm{-cs}}%
    \def\ekvd@errm{\expkvdoc@errm{-def}}%
    \def\ekvp@errm{\expkvdoc@errm{-pop}}%
  }
\makeatother

\ExplSyntaxOn
\str_new:N \g__expkvdoc_module_str
\cs_new_protected:Npn \expkvdocfile #1% >>=
  {
    \expkvdoc_for_module:nn {#1}
      {
        \str_if_eq:nnTF {#1} {main}
          { \lstset{style=expkv} }
          { \lstset{style=expkv-#1} }
        \addtocontents{exs}
          {
            \medskip
            \noindent
            \use:c { expkv \str_if_eq:nnF {#1} {main} { \str_head:n {#1} } }
            \smallskip
          }
        \input{pkg-#1.tex}
      }
  }% =<<
\cs_new_protected:Npn \expkvdocdtx #1% >>=
  {
    \expkvdoc_for_module:nn {#1}
      {
        \str_if_eq:nnTF {#1} {main}
          { \DocInput{expkv.dtx} }
          { \DocInput{expkv-#1.dtx} }
      }
  }% =<<
\cs_new_protected:Npn \expkvdoc_for_module:nn #1#2% >>=
  {
    \use:e
      {
        \exp_not:n
          {
            \str_gset:Nn \g__expkvdoc_module_str {#1}
            #2
            \str_gset:Nn \g__expkvdoc_module_str
          }
            { \g__expkvdoc_module_str }
      }
  }% =<<
\ExplSyntaxOff

\input{preamble-l3doctweaks.tex}

%=<<

% for thanking Niranjan
% code from https://tex.stackexchange.com/a/635125/117050
\def\DevnagVersion{2.17}
\usepackage{devanagari}

\newif\ifexpkvDocImplementation%\expkvDocImplementationtrue

\begin{document}
\title{\expkvbundle}
%\title% >>=
  %{%
    %\texorpdfstring
      %{%
        %\huge\expkvbundle
        %\\[\medskipamount]
        %\Large an {\expFormat}andable
        %\meta{{\kvstyle k}\kern-.05em ey}=%
        %\meta{{\kvstyle v}\kern-.05em alue}
        %implementation and more%
      %}
      %{expkv-bundle - an expandable <key>=<value> implementation and more}%
  %}% =<<
\author
  {%
    Jonathan P. Spratte%
    \thanks
      {%
        \protect\randomize{jspratte@yahoo.de};
        Special thanks to {\protect\dn Enr\2jn} (Niranjan) for valuable
        suggestions and additions to this documentation.%
      }%
  }
\date{2023-01-23}
\begingroup
\renewcommand*\thefootnote{\fnsymbol{footnote}}
\maketitle
\endgroup

\begin{abstract}%>>=
  \noindent\parfillskip=0pt
  The \expkvbundle\ provides at its core a \emph{fully expandable} \kv\ parser,
  that is \emph{safe} for active commas and equals signs, \emph{reliable} to
  only strip one set of braces after spaces are stripped, and blazingly
  \emph{fast}, as of writing this only \pkg{keyval} is faster.
  \par
  \bigskip
  This parser gets augmented by a family of packages. \expkvc\ allows to easily
  define expandable macros using a \kv\ interface, making the expandable parser
  available to the masses. \expkvd\ provides a \kv\ interface to
  define common \key-types. With \expkvo\ you can parse package
  and class options. \expkvp\ enables you to design your own prefix
  oriented parsers for interface definitions.
\end{abstract}%=<<

\tableofcontents

\clearpage

\begin{documentation}% >>=
\ifexpkvDocImplementation\part{Documentation}\fi

\input{introduction.tex}
\clearpage
\input{impatient.tex}

\expkvdocfile{main}
\expkvdocfile{cs}
\expkvdocfile{def}
\expkvdocfile{opt}
\expkvdocfile{pop}
\clearpage
\lstset{style=expkv-all}
\input{comparison.tex}
\end{documentation}% =<<

\clearpage
\listofexamples

\ifexpkvDocImplementation
  \clearpage
  \begin{implementation}% >>=
    \part{Implementation}
    \expkvdocdtx{main}
    \clearpage
    \expkvdocdtx{cs}
    \clearpage
    \expkvdocdtx{def}
    \clearpage
    \expkvdocdtx{opt}
    \clearpage
    \expkvdocdtx{pop}
  \end{implementation}% =<<
\fi

\clearpage
\PrintIndex
\end{document}