%% luakeys-debug.tex
%% Copyright 2021-2022 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 luakeys.lua, luakeys.sty, luakeys.tex
% luakeys-debug.sty and luakeys-debug.tex.

\directlua{
  luakeys = require('luakeys')
}

% https://tex.stackexchange.com/a/418401/42311
\catcode`\@=11
\long\def\LuaKeysIfNextChar#1#2#3{%
  \let\@tmpa=#1%
  \def\@tmpb{#2}%
  \def\@tmpc{#3}%
  \futurelet\@future\LuaKeysIfNextChar@i%
}%
\def\LuaKeysIfNextChar@i{%
  \ifx\@tmpa\@future%
    \expandafter\@tmpb
  \else
    \expandafter\@tmpc
  \fi
}%
\def\luakeysdebug@parse@options#1{
  \directlua{
    luakeys.save('debug_options', luakeys.parse('#1'))
  }
}%
\def\luakeysdebug@output#1{
  {
    \tt
    \parindent=0pt
    \directlua{
      local result = luakeys.parse('\luaescapestring{\unexpanded{#1}}', luakeys.get('debug_options'))
      tex.print(luakeys.stringify(result, true))
      luakeys.print(result)
    }
  }
}%
\def\luakeysdebug@oarg[#1]#2{%
  \luakeysdebug@parse@options{#1}%
  \luakeysdebug@output{#2}%
}%
\def\luakeysdebug@marg#1{%
  \luakeysdebug@output{#1}%
}%
\def\luakeysdebug{\LuaKeysIfNextChar[{\luakeysdebug@oarg}{\luakeysdebug@marg}}%
\catcode`\@=12
