%%%==============================================================================
%% Copyright 2023-present by Alceu Frigeri
%%
%% This work may be distributed and/or modified under the conditions of
%%
%% * The [LaTeX Project Public License](http://www.latex-project.org/lppl.txt),
%%   version 1.3c (or later), and/or
%% * The [GNU Affero General Public License](https://www.gnu.org/licenses/agpl-3.0.html),
%%   version 3 (or later)
%%
%% This work has the LPPL maintenance status *maintained*.
%%
%% The Current Maintainer of this work is Alceu Frigeri
%%
%% This is version {1.24a} {2026/02/14}
%%
%% The list of files that compose this work can be found in the README.md file at
%% https://ctan.org/pkg/codedescribe
%%
%%%==============================================================================
\NeedsTeXFormat{LaTeX2e}[2025/06/01]

%%%%%%%
%%%
%%% Just an attempt at having my package's info in a regular way
%%%   \pkginfograb_set:nn {<pkg-name>} { props} sets package info
%%%
%%%   \pkginfograbProvidesExplPackage {<pkg-name>} { props} sets package info
%%%     and calls \ProvidesExplPackage
%%%
%%%%%%%
\RequirePackage{pkginfograb}
\pkginfograbProvidesExplPackage {codedescribe}
  {
     name        = {codedescribe} ,
     prefix      = {codedesc} ,
     date        = {2026/02/14} ,
     version     = {1.24a} ,
     description = {LaTeX Code Description/Documentation}
  }
%%%%%%%
%%% End of cut-n-paste
%%%%%%%

\use:c {@reversemargintrue}


%% bbding is need for those hollow stars...
\RequirePackage{xcolor,pifont}
\RequirePackage{xpeekahead,codecmm}

\cs_generate_variant:Nn \tl_set:Nn {Ne}
\cs_generate_variant:Nn \keys_set:nn {ne}
\cs_generate_variant:Nn \keys_define:nn {ne}
\cs_generate_variant:Nn \keys_precompile:nnN {nV}
\cs_generate_variant:Nn \tl_to_str:n {o , e}
\cs_generate_variant:Nn \msg_error:nnnnn {nnnne}
\cs_generate_variant:Nn \cs_gset:Nn {cV}

\prg_generate_conditional_variant:Nnn \regex_split:NnN {No} {TF}


    %%%%%%%
    %%% prep. for an eventual `side notes` parametrization
    %%%%%%%
\cs_set_eq:NN \__codedesc_note_fmt: \scriptsize

\bool_new:N       \l__codedesc_pkgopt_loadlisting_bool
\bool_set_true:N  \l__codedesc_pkgopt_loadlisting_bool
\bool_new:N       \l__codedesc_pkgopt_indexset_bool

\tl_set:Nn        \l__codedesc_pkgopt_colorsbright_tl {default}

%% instead of using kernel scratch variables.
\tl_new:N         \l__codedesc_tmpa_tl
\tl_new:N         \l__codedesc_tmpb_tl
\tl_new:N         \l__codedesc_tmpc_tl

\tl_new:N         \g__codedesc_tmpc_tl

\seq_new:N        \l__codedesc_tmpa_seq
\seq_new:N        \l__codedesc_tmpb_seq
\seq_new:N        \l__codedesc_tmpc_seq

\clist_new:N      \l__codedesc_tmpa_clist

\coffin_new:N     \l__codedesc_tmpa_coffin
\coffin_new:N     \l__codedesc_tmpb_coffin


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

    %%%%%%%
    %%% locale
    %%% label sets (package option)
    %%%%%%%
\seq_new:N          \l__codedesc_labelsets_seq


    %%%%%%%
    %%% This one comes first because can be called while loading.
    %%%%%%%
\msg_new:nnnn { codedesc / errors } {locale-err}
  {
    (#1)~label~set~(#2)~not~defined! ~valid~ones:~#3
  }
  {
    You~tried~to~use~a~non~defined~label~set:#2.
    ~Error~Code~ ID:<#1>.
    ~Valid~ sets: ~ #3
  }

\keys_define:nn {codedescribe / labels}
  {
    new .usage:n              = general ,
    new .tl_set:N             = \l__codedesc_label_new_tl ,
    new .value_required:n     = true ,

    update .usage:n           = general ,
    update .tl_set:N          = \l__codedesc_label_update_tl ,
    update .value_required:n  = true ,

    note .usage:n             = general ,
    note .tl_set:N            = \l__codedesc_label_note_tl ,
    note .value_required:n    = true ,

    remark .usage:n           = general ,
    remark .tl_set:N          = \l__codedesc_label_remark_tl ,
    remark .value_required:n  = true ,

    or .usage:n               = general ,
    or .tl_set:N              = \l__codedesc_label_or_tl ,
    or .value_required:n      = true ,

    and .usage:n              = general ,
    and .tl_set:N             = \l__codedesc_label_and_tl ,
    and .value_required:n     = true ,

    months .usage:n           = general ,
    months .code:n            =
      { \seq_set_from_clist:Nn \l__codedesc_label_months_seq {#1} } ,
    months .value_required:n  = true ,

    label~ set  .usage:n      = general ,
    label~ set  .choice: ,
    label~ set / unknown .code:n =
      {
        \msg_error:nnnne { codedesc / errors } {locale-err}
          {locale01} {#1} { \seq_use:Nn \l__codedesc_labelsets_seq {,~} }
      } ,


  }

\cs_new_protected:Npn \__codedesc_setlabels:n #1
  {
    \keys_set:nn {codedescribe / labels}{#1}
  }

\cs_new_protected:Npn \__codedesc_new_labelset_aux:nn #1#2
  {
    \keys_define:nn {codedescribe / labels}
      {
        label~ set / #1 .code:n = {#2} ,
      }
  }
\cs_generate_variant:Nn \__codedesc_new_labelset_aux:nn  {nV}

\cs_new_protected:Npn \__codedesc_new_labelset:nn #1#2
  {
    \keys_precompile:nnN
      {codedescribe / labels} {#2}
      \l__codedesc_tmpa_tl

    \__codedesc_new_labelset_aux:nV {#1} \l__codedesc_tmpa_tl

    \seq_put_right:Nn
      \l__codedesc_labelsets_seq
      {#1}
  }

\cs_new_eq:NN \setcodelabels  \__codedesc_setlabels:n
\cs_new_eq:NN \newlabelset    \__codedesc_new_labelset:nn

\NewDocumentCommand \selectlabelset {m}
  {
    \msg_warning:nnnnnn { codedesc / deprecated } {deprecated}
      {label01} {command}{\selectlabelset}{\setcodelabels}
    \__codedesc_setlabels:n { label~ set = #1 }
  }

    %%%%%%%
    %%% language set are to be defined at codedescsets
    %%%%%%%
\RequirePackage{codedescsets}

    %%%%%%%
    %%% Default label set
    %%%%%%%
\__codedesc_setlabels:n { label~ set = english }


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


%%%
%%% These two are related to {codedescribe} environment
%%% but the default value can be changed (package option)
%%%
\bool_new:N       \l__codedesc_descopt_inseq_bool
\bool_new:N       \l__codedesc_descopt_force_margin_bool


\bool_new:N       \l__codedesc_descopt_variants_bool
\bool_new:N       \l__codedesc_descopt_compact_bool


\keys_define:nn { codedescribe }
  {
    nolisting .usage:n              = load ,
  	nolisting .bool_set_inverse:N   = \l__codedesc_pkgopt_loadlisting_bool ,
    nolisting .default:n            = {true} ,

    no~ listing .usage:n            = load ,
  	no~ listing .bool_set_inverse:N = \l__codedesc_pkgopt_loadlisting_bool ,
    no~ listing .default:n          = {true} ,

    codelisting .usage:n            = load ,
    codelisting .code:n             =
      { \PassOptionsToPackage{#1}{codelisting} } ,

    index .usage:n                  = load ,
  	index .bool_set:N               = \l__codedesc_pkgopt_indexset_bool ,
    index .default:n                = {true} ,

    describe~ keys .usage:n         = load ,
    describe~ keys .value_required:n = true ,
    describe~ keys .choice: ,
    describe~ keys / grouped
      .code:n = { \bool_set_false:N \l__codedesc_descopt_inseq_bool } ,
    describe~ keys / as~ is
      .code:n = { \bool_set_true:N \l__codedesc_descopt_inseq_bool } ,

    base~ skip .usage:n             = load ,
    base~ skip .code:n              =
      { \__codecmm_set_skips:n {#1} } ,
    base~ skip .value_required:n    = true ,

    label~ set .usage:n             = load ,
    label~ set .code:n              =
      { \__codedesc_setlabels:n { label~ set = #1 } } ,
    label~ set .value_required:n    = true ,

    colors .usage:n                 = load ,
    colors .choices:nn              =
      { default , black , brighter , darker }
      { \tl_set_eq:NN \l__codedesc_pkgopt_colorsbright_tl \l_keys_choice_tl } ,
    colors .value_required:n        = true ,

    silence .usage:n                = load ,
    silence .code:n                 =
      { \hfuzz=#1 } ,
    silence .default:n              = 18.89999pt ,

    strict .usage:n                 = load ,
    strict .code:n                  =
      {
        \msg_redirect_module:nnn { codedesc / warnings } { warning } { error }
        \PassOptionsToPackage{strict}{codelisting}
      } ,

    suppress~ deprecated .usage:n                 = load ,
    suppress~ deprecated .code:n                  =
      {
        \msg_redirect_module:nnn { codedesc / deprecated } { warning } { none }
        \PassOptionsToPackage{suppress~ deprecated}{codelisting}
      } ,

    info grab .usage:n              = load ,
  	info grab .code:n               =
      { \pkginfograb_set_aliases: } ,
  }
\ProcessKeyOptions [ codedescribe ]

\bool_if:NT \l__codedesc_pkgopt_loadlisting_bool
  { \RequirePackage{codelisting} }


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


\msg_new:nnnn { codedesc / errors } {key choice}
  {
    (#1)~Choice~'#2'~not~defined!~Possible~values:~ #3
  }
  {
    You~tried~to~select~a~non~defined~value:#2.
    ~Possible~values:~#3
    ~Error~Code~ ID:<#1>.
  }

\msg_new:nnnn { codedesc / errors } {format-err}
  {
    (#1)~Format~Key~(#2)~not~defined!
  }
  {
    You~tried~to~use~a~non~defined~format~key:#2.
    ~Error~Code~ ID:<#1>.
  }

\msg_new:nnnn { codedesc / errors } {group-err}
  {
    (#1)~Format~group~(#2)~not~defined!
  }
  {
    You~tried~to~use~a~non~defined~format~group:#2.
    ~Error~Code~ ID:<#1>.
  }

\msg_new:nnnn { codedesc / errors } {object-err}
  {
    (#1)~Objetc~Type~(#2)~not~defined!
  }
  {
    You~tried~to~use~a~non~defined~object~type:#2.
    ~Error~Code~ ID:<#1>.
  }

\msg_new:nnnn { codedesc / warnings } {nested-env}
  {
    (#1)~You~are~nesting~a~\{#2\}~inside~of~a~\{#3\}. ~Better~ not.
  }
  {
    You~began~a ~\{#2\}~inside~of~a~\{#3\}.~ Better~ not.
    ~Error~Code~ ID:<#1>.
  }

\msg_new:nnnn { codedesc / warnings } {out of scope}
  {
    (#1)~You~tried~to~use~\{#2\}~outside~of~\{#3\}
  }
  {
    You~tried~to~use~\{#2\}~outside~of~\{#3\}.
    ~Error~Code~ ID:<#1>.
  }


\msg_new:nnnn { codedesc / warnings } {syntax dup}
  {
    (#1)~You~declared~the~codesyntax~env~ multiple~times
  }
  {
    (#1)~You~declared~the~codesyntax~env~multiple~times.
    Only~ the~ last~ one~ will~ prevail.
    ~Error~Code~ ID:<#1>.
  }

%%%
%%% #2 shall, normally, be {command} or {environment}
%%%
\msg_new:nnnn { codedesc / deprecated } {deprecated}
  {
    (#1)~The~ #2~ #3 ~is~ being~ deprecated~ use~ #4 ~ instead
  }
  {
    You~tried~to~use~a~deprecated~ #2:~ #3.
    Use~ #4~ instead.
    ~Error~Code~ ID:<#1>.
  }

\msg_new:nnnn { codedesc / deprecated } {deprecated env}
  {
    (#1)~The~ environment~#2~is~ being~ deprecated~ use~ #3 ~ instead
  }
  {
    You~tried~to~use~a~deprecated~ environment:#2.
    Use~ #3~ instead.
    ~Error~Code~ ID:<#1>.
  }

\msg_new:nnnn { codedesc / deprecated } {deprecated cs}
  {
    (#1)~The~ command~#2~is~ being~ deprecated~ use~ #3 ~ instead
  }
  {
    You~tried~to~use~a~deprecated~ command:#2.
    Use~ #3~ instead.
    ~Error~Code~ ID:<#1>.
  }


\msg_new:nnnn { codedesc / errors } {preamble only}
  {
    (#1)~The~ command~#2~can~ only~be~ used~in~the~preamble
  }
  {
    You~tried~to~use, ~in ~ the~ document~ body,
    a~preamble~ only~ command:~#2.
    ~Error~Code~ ID:<#1>.
  }

\msg_new:nnnn { codedesc / errors } {undefined cs}
  {
    (#1)~command~#2~doesn't ~ exist,~ and~ will~ be~ ignored
  }
  {
    The~ provided~ command~ (~#2~)~isn't~ defined~ and ~ will~ be ~ ignored.
    ~Error~Code~ ID:<#1>.
  }

\msg_new:nnnn { codedesc / index } {cs warning}
  {
    (#1)~command~#2~doesn't ~ exist~ yet. This~ might~be~an~error
  }
  {
    The~ provided~ command~ (~#2~)~isn't~ defined~ and ~ will~ be ~ ignored.
    ~Error~Code~ ID:<#1>.
  }

\msg_new:nnnn { codedesc / shortcut } {pre defined}
  {
    (#1)~The~character~#2~had~this~definition:~ #3
  }
  {
    Possible~ package~ conflict.~
    The character~#2~ already~had~an~ active~ code:~#3.~~
    And~ it~was:~#4
    ~Error~Code~ ID:<#1>.
  }


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


    %%%%%%%
    %%% Color schemes (package option)
    %%%%%%%
\cs_new_protected:Npn \__codedesc_set_colors:n #1
  {
    \__codecmm_color_set:ne {c__codedesc_none_color}       { \l__codedesc_colorscheme_error_tl  ! \fp_eval:n{ 40 + 15 * #1 } ! black ! 100 }
  	\__codecmm_color_set:ne {c__codedesc_verb_color}       { \l__codedesc_colorscheme_verb_tl   ! \fp_eval:n{ 30 * #1 }      ! black ! 100 }
  	\__codecmm_color_set:ne {c__codedesc_marg_color}       { \l__codedesc_colorscheme_args_tl   ! \fp_eval:n{ 15 + 15 * #1 } ! black ! 100 }
  	\__codecmm_color_set:ne {c__codedesc_oarg_color}       { \l__codedesc_colorscheme_args_tl   ! \fp_eval:n{ 25 + 15 * #1 } ! black ! 100 }
%  	\__codecmm_color_set:ne {c__codedesc_marg_color}       { \l__codedesc_colorscheme_args_tl   ! \fp_eval:n{ 40 + 15 * #1 } ! black ! 100 }
%  	\__codecmm_color_set:ne {c__codedesc_oarg_color}       { \l__codedesc_colorscheme_args_tl   ! \fp_eval:n{ 60 + 15 * #1 } ! black ! 100 }

  	\__codecmm_color_set:ne {c__codedesc_code_color}       { \l__codedesc_colorscheme_code_tl   ! \fp_eval:n{ 30 * #1 }      ! black ! 100 }
  	\__codecmm_color_set:ne {c__codedesc_syntax_color}     { \l__codedesc_colorscheme_code_tl   ! \fp_eval:n{ 35 * #1 }      ! black ! 100 }
  	\__codecmm_color_set:ne {c__codedesc_keys_color}       { \l__codedesc_colorscheme_keys_tl   ! \fp_eval:n{ 30 * #1 }      ! black ! 100 }
  	\__codecmm_color_set:ne {c__codedesc_options_color}    { \l__codedesc_colorscheme_keys_tl   ! \fp_eval:n{ 30 * #1 }      ! black ! 100 }
  	\__codecmm_color_set:ne {c__codedesc_values_color}     { \l__codedesc_colorscheme_values_tl ! \fp_eval:n{ 30 * #1 }      ! black ! 100 }
  	\__codecmm_color_set:ne {c__codedesc_defaultval_color} { \l__codedesc_colorscheme_values_tl ! \fp_eval:n{ 35 * #1 }      ! black ! 100 }
  	\__codecmm_color_set:ne {c__codedesc_env_color}        { \l__codedesc_colorscheme_env_tl    ! \fp_eval:n{ 30 * #1 }      ! black ! 100 }
  	\__codecmm_color_set:ne {c__codedesc_pkg_color}        { \l__codedesc_colorscheme_pack_tl   ! \fp_eval:n{ 30 * #1 }      ! black ! 100 }
  }
\cs_generate_variant:Nn  \__codedesc_set_colors:n {V}


\cs_new_protected:Npn \__codedesc_set_brightness:n #1
  {
    \str_case:enF {#1}
      {
        {default}
          { \__codedesc_set_colors:n {1} }
        {black}
          { \__codedesc_set_colors:n {0} }
        {brighter}
          { \__codedesc_set_colors:n {1.5} }
        {darker}
          { \__codedesc_set_colors:n {0.70} }
      } %% fail-safe: default
      { \__codedesc_set_colors:n {1} }
  }
\cs_generate_variant:Nn  \__codedesc_set_brightness:n {V}


\keys_define:nn { codedesc / color scheme }
  {
    error   .usage:n              = general ,
    error   .tl_set:N             = \l__codedesc_colorscheme_error_tl ,
    error   .default:n            = red ,

    verb    .usage:n              = general ,
    verb    .tl_set:N             = \l__codedesc_colorscheme_verb_tl ,
    verb    .default:n            = black ,

    args    .usage:n              = general ,
    args    .tl_set:N             = \l__codedesc_colorscheme_args_tl ,
    args    .default:n            = white , %gray ,

    code    .usage:n              = general ,
    code    .tl_set:N             = \l__codedesc_colorscheme_code_tl ,
    code    .default:n            = blue ,

    keys    .usage:n              = general ,
    keys    .tl_set:N             = \l__codedesc_colorscheme_keys_tl ,
    keys    .default:n            = teal ,

    values  .usage:n              = general ,
    values  .tl_set:N             = \l__codedesc_colorscheme_values_tl ,
    values  .default:n            = green ,

    env     .usage:n              = general ,
    env     .tl_set:N             = \l__codedesc_colorscheme_env_tl ,
    env     .default:n            = green ,

    pack    .usage:n              = general ,
    pack    .tl_set:N             = \l__codedesc_colorscheme_pack_tl ,
    pack    .default:n            = green ,

    brightness  .usage:n          = general ,
    brightness  .tl_set:N         = \l__codedesc_colorscheme_bright_tl ,
    brightness  .default:n        = 1 ,

    scheme  .usage:n              = general ,
    scheme  .choice: ,
    scheme  .default:n            = default ,
  }


\cs_new_protected:Npn \__codedesc_set_colorscheme:n #1
  {
    \keys_set:nn { codedesc / color scheme } {#1}
    \__codedesc_set_colors:n \l__codedesc_colorscheme_bright_tl
  }

\cs_new_protected:Npn  \__codedesc_new_colorscheme:nn #1#2
  {
    \keys_precompile:nnN { codedesc / color scheme } {#2}
      \l__codedesc_tmpa_tl
    \keys_define:ne { codedesc / color scheme }
      {
        scheme / #1
          .code:n = { \exp_not:V \l__codedesc_tmpa_tl }
      }
  }

\__codedesc_new_colorscheme:nn
  {default}
  { error , verb , args , code , keys , values , env , pack , brightness }

\keys_set:nn { codedesc / color scheme } {scheme = default}
\__codedesc_set_brightness:n \l__codedesc_pkgopt_colorsbright_tl



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


%%%%%%%%
%%%
%%% makeindex especifiers
%%%
%%%%%%%%
%%% { {level} {actual} {encap} {quote} }
\tl_new:N \l__codedesc_index_specs_tl
\tl_set:Nn \l__codedesc_index_specs_tl { {!} {@} {|} {"} }
%%% { {arg_open} {arg_close} {range_open} {range_close} }
\tl_new:N \l__codedesc_index_oc_specs_tl
\tl_set:Nn \l__codedesc_index_oc_specs_tl { {\{} {\}} {(} {)} }
%%% { {escape} {page_compositor} {keyword} }
\tl_new:N \l__codedesc_index_others_specs_tl
\tl_set:Nn \l__codedesc_index_others_specs_tl { {\\} {-} {\indexentry} }

%%
%% This has a :wn because \index might have (or not) a conditional parameter.
%% And it has to be delayed because an index package(s) (if any) might/will change it...
%%
%\AtBeginDocument
\AddToHook {begindocument}
  { \cs_set_eq:NN \__codedesc_index_cmd:wn \index }

\keys_define:nn { codedesc / index }
  {
    index~ cmd .usage:n = preamble ,
    index~ cmd .value_required:n = true ,
    index~ cmd .code:n =
      {
        \AddToHook {begindocument}
          {
            \cs_if_exist:NTF #1
              {
                \cs_set_eq:NN \__codedesc_index_cmd:wn #1
              }
              {
                \msg_error:nnnn { codedesc / errors } {undefined cs}
                  {idx01} {#1}
              }
          }
      } , %% It's delayed past the preamble, to be sure #1 is defined (by other package(s))

    index~ specs .usage:n = preamble ,
    index~ specs .value_required:n = true ,
    index~ specs .tl_set:N = \l__codedesc_index_specs_tl ,
    index~ specs .default:n = {{!}{@}{|}{"}} ,

    index~ specs~ oc .usage:n = preamble ,
    index~ specs~ oc .value_required:n = true ,
    index~ specs~ oc .tl_set:N = \l__codedesc_index_oc_specs_tl ,
    index~ specs~ oc .default:n = {{\{}{\}}{(}{)}} ,

    index~ specs~ others .usage:n = preamble ,
    index~ specs~ others .value_required:n = true ,
    index~ specs~ others .tl_set:N = \l__codedesc_index_others_specs_tl ,
    index~ specs~ others .default:n = {{\\}{-}{\indexentry}} ,
  }

\cs_new_protected:Npn \__codedesc_index_setup:n #1
  {
    \__codedesc_if_document:TF
      {
        \msg_error:nnnn  { codedesc / errors } {preamble only}
          {setup:01} {\indexcodesetup}
      }
      {
        \keys_set:nn { codedesc / index } {#1}
        \__codedesc_index_setcmds:
      }
  }

\cs_set_eq:NN \indexcodesetup \__codedesc_index_setup:n


\makeatletter
\cs_new_protected:Npn \__codedesc_if_document:TF
  {
    \cs_if_eq:NNTF \@onlypreamble \@notprerr
  }
\makeatother

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


    %%%%%%%
    %%% group/object formats
    %%%%%%%

\tl_new:N \l__codedesc_deftmp_font_tl
\tl_new:N \l__codedesc_deftmp_fsize_tl
\tl_new:N \l__codedesc_deftmp_fmt_tl
\tl_new:N \l__codedesc_deftmp_shape_tl
\tl_new:N \l__codedesc_deftmp_color_tl
\tl_new:N \l__codedesc_deftmp_lbracket_tl
\tl_new:N \l__codedesc_deftmp_rbracket_tl
\tl_new:N \l__codedesc_deftmp_indxgrp_tl
\tl_new:N \l__codedesc_deftmp_indxpre_tl
\tl_new:N \l__codedesc_deftmp_indxname_tl
\tl_new:N \l__codedesc_deftmp_indx_tl
\tl_new:N \l__codedesc_deftmp_indxfmt_tl
\tl_new:N \l__codedesc_deftmp_shapepreadj_tl
\tl_new:N \l__codedesc_deftmp_shapeposadj_tl
\tl_new:N \l__codedesc_makefmt_tmp_tl
\seq_new:N \l__codedesc_idx_gen_seq

\keys_define:nn { codedesc / scratch_def }
  {
    font            .usage:n            = general ,
    font            .value_required:n   = true ,
    font            .code:n             =
      {
        \cs_if_exist:NTF #1
          {
            \tl_set:Nn \l__codedesc_deftmp_font_tl { font = #1 , }
          }
          {
            \msg_error:nnnn { codedesc / errors } {undefined cs}
              {font01} {#1}
          }
      },

    fsize           .usage:n            = general ,
    fsize           .value_required:n   = true ,
    fsize           .code:n             =
      {
        \cs_if_exist:NTF #1
          {
            \tl_set:Nn \l__codedesc_deftmp_fsize_tl { fsize = #1 , }
          }
          {
            \msg_error:nnnn { codedesc / errors } {undefined cs}
              {fsize01} {#1}
          }
      } ,

    meta            .usage:n            = general ,
    meta            .value_forbidden:n  = true ,
    meta            .code:n             =
      { \tl_set:Nn \l__codedesc_deftmp_fmt_tl {meta , } } ,

    xmeta           .usage:n            = general ,
    xmeta           .value_forbidden:n  = true ,
    xmeta           .code:n             =
      { \tl_set:Nn \l__codedesc_deftmp_fmt_tl {xmeta , } } ,

    code            .usage:n            = general ,
    code            .value_forbidden:n  = true ,
    code            .code:n             =
      { \tl_set:Nn \l__codedesc_deftmp_fmt_tl {code , } } ,

    verb            .usage:n            = general ,
    verb            .value_forbidden:n  = true ,
    verb            .code:n             =
      { \tl_set:Nn \l__codedesc_deftmp_fmt_tl {verb , } } ,

    xverb           .usage:n            = general ,
    xverb           .value_forbidden:n  = true ,
    xverb           .code:n             =
      { \tl_set:Nn \l__codedesc_deftmp_fmt_tl {xverb , } } ,

    nofmt           .usage:n            = general ,
    nofmt           .value_forbidden:n  = true ,
    nofmt           .code:n             =
      {\tl_clear:N \l__codedesc_deftmp_fmt_tl } ,

    no~fmt          .usage:n            = general ,
    no~fmt          .value_forbidden:n  = true ,
    no~fmt          .code:n             =
      {\tl_clear:N \l__codedesc_deftmp_fmt_tl } ,

    format          .usage:n            = general ,
    format          .value_required:n   = true ,
    format          .choice: ,
    format / meta
      .code:n = { \tl_set:Nn \l__codedesc_deftmp_fmt_tl {meta , } } ,
    format / xmeta
      .code:n = { \tl_set:Nn \l__codedesc_deftmp_fmt_tl {xmeta , } } ,
    format / code
      .code:n = { \tl_set:Nn \l__codedesc_deftmp_fmt_tl {code , } } ,
    format / verb
      .code:n = { \tl_set:Nn \l__codedesc_deftmp_fmt_tl {verb , } } ,
    format / xverb
      .code:n = { \tl_set:Nn \l__codedesc_deftmp_fmt_tl {xverb , } } ,
    format / nofmt
      .code:n = { \tl_clear:N \l__codedesc_deftmp_fmt_tl } ,
    format / no~fmt
      .code:n = { \tl_clear:N \l__codedesc_deftmp_fmt_tl } ,
    format / none
      .code:n = { \tl_clear:N \l__codedesc_deftmp_fmt_tl } ,
    format / unknown .code:n =
      {
       \msg_error:nneee { codedesc / errors } {key choice} {format02}{\l_keys_value_tl}{meta,~xmeta,~code,~verb,~xverb,~nofmt,~none}
      },

    slshape         .usage:n            = general ,
    slshape         .value_forbidden:n  = true ,
    slshape         .code:n             =
      { \tl_set:Nn \l__codedesc_deftmp_shape_tl { slshape , } } ,

    itshape         .usage:n            = general ,
    itshape         .value_forbidden:n  = true ,
    itshape         .code:n             =
      { \tl_set:Nn \l__codedesc_deftmp_shape_tl { itshape , } } ,

    noshape         .usage:n            = general ,
    noshape         .value_forbidden:n  = true ,
    noshape         .code:n             =
      { \tl_clear:N \l__codedesc_deftmp_shape_tl } ,

    shape           .usage:n            = general ,
    shape           .value_required:n   = true ,
    shape           .choice: ,
    shape / none
      .code:n = { \tl_clear:N \l__codedesc_deftmp_shape_tl } ,
    shape / noshape
      .code:n = { \tl_clear:N \l__codedesc_deftmp_shape_tl } ,
    shape / italic
      .code:n = { \tl_set:Nn \l__codedesc_deftmp_shape_tl { itshape , } } ,
    shape / itshape
      .code:n = { \tl_set:Nn \l__codedesc_deftmp_shape_tl { itshape , } } ,
    shape / slanted
      .code:n = { \tl_set:Nn \l__codedesc_deftmp_shape_tl { slshape , } } ,
    shape / slshape
      .code:n = { \tl_set:Nn \l__codedesc_deftmp_shape_tl { slshape , } } ,
    shape / unknown .code:n =
      {
       \msg_error:nneee { codedesc / errors } {key choice} {shape02}{\l_keys_value_tl}{italic,~itshape,~slanted,~slshape,~noshape,~none}
      },

    shape~ preadj   .usage:n            = general ,
    shape~ preadj   .value_required:n   = true ,
    shape~ preadj   .choice: ,
    shape~ preadj / none
      .code:n = { \tl_clear:N \l__codedesc_deftmp_shapepreadj_tl },
    shape~ preadj / very ~ thin
      .code:n = { \tl_set:Nn  \l__codedesc_deftmp_shapepreadj_tl { shape~ preadj = very~ thin  , } },
    shape~ preadj / thin
      .code:n = { \tl_set:Nn  \l__codedesc_deftmp_shapepreadj_tl { shape~ preadj = thin  , } },
    shape~ preadj / mid
      .code:n = { \tl_set:Nn  \l__codedesc_deftmp_shapepreadj_tl { shape~ preadj = mid  , } },

    shape~ posadj   .usage:n            = general ,
    shape~ posadj   .value_required:n   = true ,
    shape~ posadj   .choice: ,
    shape~ posadj / none
      .code:n = { \tl_clear:N \l__codedesc_deftmp_shapeposadj_tl },
    shape~ posadj / very ~ thin
      .code:n = { \tl_set:Nn  \l__codedesc_deftmp_shapeposadj_tl { shape~ posadj = very~ thin  , } },
    shape~ posadj / thin
      .code:n = { \tl_set:Nn  \l__codedesc_deftmp_shapeposadj_tl { shape~ posadj = thin  , } },
    shape~ posadj / mid
      .code:n = { \tl_set:Nn  \l__codedesc_deftmp_shapeposadj_tl { shape~ posadj = mid  , } },

    color           .usage:n            = general ,
    color           .value_required:n   = true ,
    color           .code:n             =
      { \tl_set:Nn \l__codedesc_deftmp_color_tl { color = #1  , } },

    lbracket        .usage:n            = general ,
    lbracket        .value_required:n   = true ,
    lbracket        .code:n             =
      { \tl_set:Nn \l__codedesc_deftmp_lbracket_tl { lbracket = #1  , } } ,

    rbracket        .usage:n            = general ,
    rbracket        .value_required:n   = true ,
    rbracket        .code:n             =
      { \tl_set:Nn \l__codedesc_deftmp_rbracket_tl { rbracket = #1  , } } ,

  	unknown   .code:n =
      {
       \msg_error:nnxx { codedesc / errors } {format-err} {format}{\l_keys_key_str}
      },
  }


\bool_if:NTF \l__codedesc_pkgopt_indexset_bool
  {
    \keys_define:nn { codedesc / scratch_def }
      {
        index~ prefix    .usage:n            = general ,
        index~ prefix    .value_required:n   = true ,
        index~ prefix    .code:n             =
          { \tl_set:Nn \l__codedesc_deftmp_indxpre_tl { index~ prefix = {#1}  , } } ,

        index~ gen~ prefix    .usage:n            = general ,
        index~ gen~ prefix    .value_required:n   = true ,
        index~ gen~ prefix    .code:n             =
          {
            \__codedesc_idx_genkey:Ne \l__codedesc_tmpc_tl {#1}
            \tl_set:Ne \l__codedesc_deftmp_indxpre_tl { index~ prefix = {\l__codedesc_tmpc_tl}  , }
          } ,

        index~ group    .usage:n            = general ,
        index~ group    .value_required:n   = true ,
        index~ group    .code:n             =
          { \tl_set:Nn \l__codedesc_deftmp_indxgrp_tl { index~ group = {#1}  , } } ,

        index~ gen~ group    .usage:n            = general ,
        index~ gen~ group    .value_required:n   = true ,
        index~ gen~ group    .code:n             =
          {
            \__codedesc_idx_genkey:Ne \l__codedesc_tmpc_tl {#1}
            \tl_set:Ne \l__codedesc_deftmp_indxgrp_tl { index~ group = {\l__codedesc_tmpc_tl}  , }
          } ,

        index~ name    .usage:n            = general ,
        index~ name    .value_required:n   = true ,
        index~ name    .code:n             =
          { \tl_set:Nn \l__codedesc_deftmp_indxname_tl { index~name = {#1}  , } } ,

        index           .usage:n            = general ,
        index           .value_forbidden:n  = true ,
        index           .code:n             =
          { \tl_set:Nn \l__codedesc_deftmp_indx_tl { index  , } } ,

        no~ index       .usage:n            = general ,
        no~ index       .value_forbidden:n  = true ,
        no~ index       .code:n             =
          { \tl_set:Nn \l__codedesc_deftmp_indx_tl { no~ index  , } } ,

        index~ fmt      .usage:n            = general ,
        index~ fmt      .value_required:n   = true ,
        index~ fmt      .code:n             =
          {
            \tl_set:Nn \l__codedesc_deftmp_indxfmt_tl { index~ fmt = #1 , }
            \cs_if_exist:NTF #1
              { }
              { \msg_warning:nnnn { codedesc / index } {cs warning} {idxfmt01} {#1} }
          },
      }
  }
  { % silently ignore them... if index not used
    \keys_define:nn { codedesc / scratch_def }
      {
        index~ prefix    .usage:n            = general ,
        index~ prefix    .value_required:n   = true ,
        index~ prefix    .code:n             = {  } ,

        index~ gen~ prefix    .usage:n            = general ,
        index~ gen~ prefix    .value_required:n   = true ,
        index~ gen~ prefix    .code:n             = {  } ,

        index~ group    .usage:n            = general ,
        index~ group    .value_required:n   = true ,
        index~ group    .code:n             = {  } ,

        index~ gen~ group    .usage:n            = general ,
        index~ gen~ group    .value_required:n   = true ,
        index~ gen~ group    .code:n             = {  } ,

        index~ name    .usage:n            = general ,
        index~ name    .value_required:n   = true ,
        index~ name    .code:n             = {  } ,

        index           .usage:n            = general ,
        index           .value_forbidden:n  = true ,
        index           .code:n             = {  } ,

        no~ index       .usage:n            = general ,
        no~ index       .value_forbidden:n  = true ,
        no~ index       .code:n             = {  } ,

        index~ fmt      .usage:n            = general ,
        index~ fmt      .value_required:n   = true ,
        index~ fmt      .code:n             = {  } ,
      }
  }


\keys_define:nn { codedesc / grp_scratch }
  {
    unknown .code:n = {}
  }

\cs_new_protected:Npn \__codedesc_group_define:nn #1#2
  {
    \group_begin:
      \keys_set:nn { codedesc / grp_scratch } {#1}
      \keys_set:nn { codedesc / scratch_def } {#2}

      \tl_set:Ne \l__codedesc_tmpa_tl
        {
          \l__codedesc_deftmp_fmt_tl
          \l__codedesc_deftmp_shape_tl
          \l__codedesc_deftmp_color_tl
          \l__codedesc_deftmp_lbracket_tl
          \l__codedesc_deftmp_rbracket_tl
          \l__codedesc_deftmp_shapepreadj_tl
          \l__codedesc_deftmp_shapeposadj_tl
          \l__codedesc_deftmp_indxgrp_tl
          \l__codedesc_deftmp_indxpre_tl
          \l__codedesc_deftmp_indxname_tl
          \l__codedesc_deftmp_indx_tl
          \exp_not:o \l__codedesc_deftmp_indxfmt_tl
          \exp_not:o \l__codedesc_deftmp_font_tl
          \exp_not:o \l__codedesc_deftmp_fsize_tl
        }

      \keys_precompile:nVN { codedesc / scratch_def }
        \l__codedesc_tmpa_tl
        \l__codedesc_tmpb_tl

    %%%%%%%
    %%% \keys_define:nn is LOCAL !!!
    %%%%%%%
      \tl_gset:NV \g__codedesc_tmpc_tl \l__codedesc_tmpb_tl

      \keys_set:nV { codedesc / make fmt } \l__codedesc_tmpa_tl
      \cs_gset:cV {__codedesc_grpfmt_ #1:} \l__codedesc_makefmt_tmp_tl

    \group_end:
    \__codedesc_grp_scratch_def:nV {#1} \g__codedesc_tmpc_tl
  }


\cs_new_protected:Npn \__codedesc_group_dup:nn #1#2
  {
    \group_begin:
      \keys_precompile:nnN { codedesc / grp_scratch } {#2}
        \l__codedesc_tmpb_tl
      \tl_gset:NV \g__codedesc_tmpc_tl \l__codedesc_tmpb_tl
    \group_end:

    \__codedesc_grp_scratch_def:nV {#1} \g__codedesc_tmpc_tl
  }


\cs_new_protected:Npn \__codedesc_grp_scratch_def:nn #1#2
  {
    \keys_define:nn { codedesc / grp_scratch }
      { #1 .code:n = {#2} }
  }
\cs_generate_variant:Nn \__codedesc_grp_scratch_def:nn {nV}

\cs_new_protected:Npn \__codedesc_object_define:nnn #1#2#3
  {
    \tl_if_blank:nTF {#3}
      {
        \cs_if_exist:cTF { __codedesc_grpfmt_ #1_objfmt : }
          {
            \keys_define:ne { codedesc / format } %% redefine it, regardless, group might have changed.
              {
                #1 .code:n =
                  \exp_not:c { __codedesc_grpfmt_ #2 : }
                  \exp_not:c { __codedesc_grpfmt_ #1_objfmt : }
              }
          }
          {
            \keys_define:ne { codedesc / format } %% redefine it, regardless, group might have changed.
              {
                #1 .code:n =
                  \exp_not:c { __codedesc_grpfmt_ #2 : }
              }
          }
      }
      {
        \__codedesc_group_define:nn { #1_objfmt } {#3}
        \keys_define:ne { codedesc / format }  %% redefine it, regardless, group might have changed.
          {
            #1 .code:n =
              \exp_not:c { __codedesc_grpfmt_ #2 : }
              \exp_not:c { __codedesc_grpfmt_ #1_objfmt : }
          }
      }
  }




    %%%%%%%
    %%% group/object format effective commands
    %%%%%%%

\keys_define:nn { codedesc / make fmt }
{
  fsize .usage:n = general ,
  fsize .value_required:n = true ,
  fsize .code:n  = {
    \tl_put_right:Nn \l__codedesc_makefmt_tmp_tl
      {
        \cs_set_eq:NN \__codedesc_metasize: #1
      }
   } ,

  font .usage:n = general ,
  font .value_required:n = true ,
  font .code:n  = {
    \tl_put_right:Nn \l__codedesc_makefmt_tmp_tl
      {
        \cs_set_eq:NN \__codedesc_metafont: #1
      }
   } ,

  meta .usage:n = general ,
  meta .value_forbidden:n = true ,
  meta .code:n  = {
    \tl_put_right:Nn \l__codedesc_makefmt_tmp_tl
      {
        \cs_set_eq:NN \__codedesc_typeset:n  \__codedesc_meta:n
      }
   } ,

  xmeta .usage:n = general ,
  xmeta .value_forbidden:n = true ,
  xmeta .code:n  = {
    \tl_put_right:Nn \l__codedesc_makefmt_tmp_tl
      {
        \cs_set_eq:NN \__codedesc_typeset:n  \__codedesc_meta*:n
      }
   } ,

  verb .usage:n = general ,
  verb .value_forbidden:n = true ,
  verb .code:n  = {
    \tl_put_right:Nn \l__codedesc_makefmt_tmp_tl
      {
        \cs_set_eq:NN \__codedesc_typeset:n \tl_to_str:n
      }
   } ,

  xverb .usage:n = general ,
  xverb .value_forbidden:n = true ,
  xverb .code:n  = {
    \tl_put_right:Nn \l__codedesc_makefmt_tmp_tl
      {
        \cs_set_eq:NN \__codedesc_typeset:n \__codedesc_verb_nospc_typeset:n
      }
   } ,

  code .usage:n = general ,
  code .value_forbidden:n = true ,
  code .code:n  = {
    \tl_put_right:Nn \l__codedesc_makefmt_tmp_tl
      {
        \cs_set_eq:NN \__codedesc_typeset:n \__codedesc_macro_typeset:n
        \cs_set_eq:NN \__codedesc_seq_from_clist:Nn \__codedesc_macro_seq_from_clist:Nn
      }
   } ,

  slshape .usage:n = general ,
  slshape .value_forbidden:n = true ,
  slshape .code:n  = {
     \tl_put_right:Nn \l__codedesc_makefmt_tmp_tl
      {
       \cs_set_eq:NN \__codedesc_metashape: \slshape
      }
   } ,

  itshape .usage:n = general ,
  itshape .value_forbidden:n = true ,
  itshape .code:n  = {
    \tl_put_right:Nn \l__codedesc_makefmt_tmp_tl
      {
        \cs_set_eq:NN \__codedesc_metashape: \itshape
      }
   } ,

  shape~ preadj .usage:n = general ,
  shape~ preadj .value_required:n = true ,
  shape~ preadj .choice: ,
  shape~ preadj / very ~ thin .code:n =
    {
      \tl_put_right:Nn \l__codedesc_makefmt_tmp_tl
      {
       \cs_set:Npn \__codedesc_shape_preadj:
         { \skip_horizontal:N \l__codecmm_verythin_skip }
      }
    } ,
  shape~ preadj / thin .code:n =
    {
      \tl_put_right:Nn \l__codedesc_makefmt_tmp_tl
      {
       \cs_set:Npn \__codedesc_shape_preadj:
         { \skip_horizontal:N \l__codecmm_thin_skip }
      }
    } ,
  shape~ preadj / mid .code:n =
    {
      \tl_put_right:Nn \l__codedesc_makefmt_tmp_tl
      {
       \cs_set:Npn \__codedesc_shape_preadj:
         { \skip_horizontal:N \l__codecmm_midthin_skip }
      }
    } ,

  shape~ posadj .usage:n = general ,
  shape~ posadj .value_required:n = true ,
  shape~ posadj .choice: ,
  shape~ posadj / very ~ thin .code:n =
    {
      \tl_put_right:Nn \l__codedesc_makefmt_tmp_tl
      {
       \cs_set:Npn \__codedesc_shape_posadj:
         { \skip_horizontal:N \l__codecmm_verythin_skip }
      }
    } ,
  shape~ posadj / thin .code:n =
    {
      \tl_put_right:Nn \l__codedesc_makefmt_tmp_tl
      {
       \cs_set:Npn \__codedesc_shape_posadj:
         { \skip_horizontal:N \l__codecmm_thin_skip }
      }
    } ,
  shape~ posadj / mid .code:n =
    {
      \tl_put_right:Nn \l__codedesc_makefmt_tmp_tl
      {
       \cs_set:Npn \__codedesc_shape_posadj:
         { \skip_horizontal:N \l__codecmm_midthin_skip }
      }
    } ,

  index .usage:n = general ,
  index .value_forbidden:n = true ,
  index .code:n = {
    \tl_put_right:Nn \l__codedesc_makefmt_tmp_tl
      {
        \bool_set_true:N \l__codedesc_index_bool
      }
  } ,

  no~ index .usage:n = general ,
  no~ index .value_forbidden:n = true ,
  no~ index .code:n = {
    \tl_put_right:Nn \l__codedesc_makefmt_tmp_tl
      {
        \bool_set_false:N \l__codedesc_index_bool
      }
  } ,

  index~ fmt .usage:n = general ,
  index~ fmt .value_required:n = true ,
  index~ fmt .code:n  = {
    \tl_put_right:Nn \l__codedesc_makefmt_tmp_tl
      {
        \cs_set_eq:NN \__codedesc_indexfmt:nnnn #1
      }
   } ,

  index~ prefix .usage:n = general ,
  index~ prefix .value_required:n = true ,
  index~ prefix .code:n = {
    \tl_if_empty:nTF { #1 }
      {
        \tl_put_right:Nn \l__codedesc_makefmt_tmp_tl
          {
            \tl_clear:N \l__codedesc_indexprefix_tl
          }
      }
      {
        \tl_put_right:Nn \l__codedesc_makefmt_tmp_tl
          {
            \tl_set:Nn \l__codedesc_indexprefix_tl { #1 }
          }
      }
  } ,

  index~ group .usage:n = general ,
  index~ group .value_required:n = true ,
  index~ group .code:n = {
    \tl_if_empty:nTF { #1 }
      {
        \tl_put_right:Nn \l__codedesc_makefmt_tmp_tl
          {
            \tl_clear:N \l__codedesc_indexgrp_tl
          }
      }
      {
        \tl_put_right:Nn \l__codedesc_makefmt_tmp_tl
          {
            \tl_set:Nn \l__codedesc_indexgrp_tl { #1 }
          }
      }
  } ,

  index~ name .usage:n = general ,
  index~ name .value_required:n = true ,
  index~ name .code:n = {
    \tl_if_empty:nTF { #1 }
      {
        \tl_put_right:Nn \l__codedesc_makefmt_tmp_tl
          {
            \tl_clear:N \l__codedesc_indexname_tl
          }
      }
      {
        \tl_put_right:Nn \l__codedesc_makefmt_tmp_tl
          {
            \tl_set:Nn \l__codedesc_indexname_tl { [#1] }
          }
      }
  } ,

  lbracket .usage:n = general ,
  lbracket .value_required:n = true ,
  lbracket .code:n = {
    \tl_put_right:Nn \l__codedesc_makefmt_tmp_tl
      {
        \tl_set:Nn \l__codedesc_Lbracket_tl { #1 }
      }
  } ,

  rbracket .usage:n = general ,
  rbracket .value_required:n = true ,
  rbracket .code:n = {
    \tl_put_right:Nn \l__codedesc_makefmt_tmp_tl
      {
        \tl_set:Nn \l__codedesc_Rbracket_tl { #1 }
      }
  } ,

  color .usage:n = general ,
  color .value_required:n = true ,
  color .code:n = {
    \tl_put_right:Nn \l__codedesc_makefmt_tmp_tl
      {
        \cs_set:Npn \__codedesc_metacolor: { \__codecmm_color_select:n{#1} }
        \cs_set:Npn \__codedesc_metafaintcolor: { \__codecmm_color_select:n{#1!75!white} }
      }
  } ,
}


    %%%%%%%
    %%% group/object formats pre-set
    %%%%%%%

\__codedesc_group_define:nn     {meta}      {meta,color=c__codedesc_marg_color}
\__codedesc_object_define:nnn   {meta}      {meta}    {}
\__codedesc_object_define:nnn   {arg}       {meta}    {}
\__codedesc_object_define:nnn   {marg}      {meta}    {lbracket={\{},rbracket={\}}}

\__codedesc_group_define:nn     {verb}      {color=c__codedesc_verb_color}
\__codedesc_object_define:nnn   {verb}      {verb}    {verb}
\__codedesc_object_define:nnn   {xverb}     {verb}    {xverb}

\__codedesc_group_define:nn     {oarg}      {meta,color=c__codedesc_oarg_color}
\__codedesc_object_define:nnn   {oarg}      {oarg}    {lbracket={[},rbracket={]}}
\__codedesc_object_define:nnn   {parg}      {oarg}    {lbracket={(},rbracket={)}}
\__codedesc_object_define:nnn   {xarg}      {oarg}    {lbracket={<},rbracket={>}}

\__codedesc_group_define:nn     {code}      {code,color=c__codedesc_code_color}
\__codedesc_object_define:nnn   {code}      {code}    {}
\__codedesc_object_define:nnn   {macro}     {code}    {}
\__codedesc_object_define:nnn   {function}  {code}    {}

\__codedesc_group_define:nn     {syntax}    {color=c__codedesc_syntax_color}
\__codedesc_object_define:nnn   {syntax}    {syntax}  {}

\__codedesc_group_define:nn     {keys}      {slshape,color=c__codedesc_keys_color}
\__codedesc_object_define:nnn   {keyval}    {keys}    {}
\__codedesc_object_define:nnn   {key}       {keys}    {}
\__codedesc_object_define:nnn   {keys}      {keys}    {}

\__codedesc_group_define:nn     {values}    {slshape,color=c__codedesc_values_color}
\__codedesc_object_define:nnn   {value}     {values}  {}
\__codedesc_object_define:nnn   {values}    {values}  {}

\__codedesc_group_define:nn     {option}    {color=c__codedesc_options_color}
\__codedesc_object_define:nnn   {option}    {option}  {}

\__codedesc_group_define:nn     {defaultval}{color=c__codedesc_defaultval_color}
\__codedesc_object_define:nnn   {defaultval}{defaultval}{}

\__codedesc_group_define:nn     {env}       {slshape,color=c__codedesc_env_color}
\__codedesc_object_define:nnn   {env}       {env}     {}

\__codedesc_group_define:nn     {pkg}       {slshape,color=c__codedesc_pkg_color}
\__codedesc_object_define:nnn   {pkg}       {pkg}     {}
\__codedesc_object_define:nnn   {pack}      {pkg}     {}


\regex_const:Nn \c__codedesc_slash_regex {^\\}
\regex_const:Nn \c__codedesc_colon_regex {:}
\regex_const:Nn \c__codedesc_under_regex {_}
%\regex_const:Nn \c__codedesc_spc_regex {~}

\cs_new_protected:Npn \__codedesc_set_sanitize_cmds:Nn #1#2
  {
    \tl_set:Nn #1 {#2}
    \str_remove_all:Nn #1 {~}
    \regex_replace_all:NnN \c__codedesc_under_regex {{\\_}} #1
  }


%%%%%%%%
%%%
%%% {level}{actual}{encap}{quote}{rest/nothing}
%%% normally (makeindex default) this is
%%% {!}{@}{|}{"}
%%% #5 is just for 'safety' and grab whatever garbage is left (should always be empty)
%%%
%%%%%%%%
\cs_new_protected:Npn \__codedesc_grab_index_specs:nnnnw #1#2#3#4#5 \q_stop
  {
    \cs_set_protected:Npn \__codedesc_idxfmt_raw:nnnn ##1##2##3##4
      { \__codedesc_index_cmd:wn ##1 {##4} }

    \cs_set_protected:Npn \__codedesc_idxfmt_rawat:nnnn ##1##2##3##4
      {
        \tl_if_empty:nTF {##3}
          { \__codedesc_index_cmd:wn ##1 {##2 ##4 #2 ##4} }
          { \__codedesc_index_cmd:wn ##1 {##2 ##4 #2 ##3 #1 ##4} }
      }

    \cs_set_protected:Npn \__codedesc_idxfmt_csraw:nnnn ##1##2##3##4
      {
        \__codedesc_set_sanitize_cmds:Nn \l__codedesc_tmpa_tl {##4}
        \regex_replace_once:NnNTF \c__codedesc_slash_regex {\\string\\} \l__codedesc_tmpa_tl
          { \__codedesc_index_cmd:wn ##1 {\l__codedesc_tmpa_tl} }
          { \__codedesc_index_cmd:wn ##1 {##4} }
      }

    \cs_set_protected:Npn \__codedesc_idxfmt_csrawat:nnnn ##1##2##3##4
      {
        \__codedesc_set_sanitize_cmds:Nn \l__codedesc_tmpa_tl {##4}
        \str_set_eq:NN \l__codedesc_tmpb_tl \l__codedesc_tmpa_tl
        \regex_replace_once:NnNTF \c__codedesc_slash_regex {} \l__codedesc_tmpa_tl
          {
            \regex_replace_once:NnN \c__codedesc_slash_regex {\\string\\} \l__codedesc_tmpb_tl
            \tl_if_empty:nTF {##3}
              { \__codedesc_index_cmd:wn ##1 {##2 \l__codedesc_tmpa_tl #2 \l__codedesc_tmpb_tl} }
              { \__codedesc_index_cmd:wn ##1 {##2 \l__codedesc_tmpa_tl #2 ##3 #1 \l__codedesc_tmpb_tl} }
          }
          {
            \tl_if_empty:nTF {##3}
              { \__codedesc_index_cmd:wn ##1 {##2 ##4 #2 ##4} }
              { \__codedesc_index_cmd:wn ##1 {##2 ##4 #2 ##3 #1 ##4} }
          }
      }

    \cs_set_protected:Npn \__codedesc_idx_genkey:Nn ##1##2
      {
        \seq_set_from_clist:Nn \l__codedesc_idx_gen_seq {##2}
        \seq_pop_left:NNTF \l__codedesc_idx_gen_seq \l__codedesc_idx_tmpa_tl
          {
            \tl_set_eq:NN ##1 \l__codedesc_idx_tmpa_tl
            \seq_pop_right:NNTF \l__codedesc_idx_gen_seq \l__codedesc_idx_tmpa_tl
              {
                \seq_map_inline:Nn \l__codedesc_idx_gen_seq
                  {
                    \tl_put_right:Nn ##1 { #1 ####1 }
                  }
                  \tl_put_right:Ne ##1 {#1 \l__codedesc_idx_tmpa_tl}
              }
              { }
          }
          { }
      }
  }
\cs_generate_variant:Nn \__codedesc_idx_genkey:Nn {Ne}

\cs_new_protected:Npn \__codedesc_index_setcmds:
  {
    \exp_last_unbraced:NV \__codedesc_grab_index_specs:nnnnw \l__codedesc_index_specs_tl \q_stop
    \cs_set_eq:NN \indexfmtraw     \__codedesc_idxfmt_raw:nnnn
    \cs_set_eq:NN \indexfmtrawat   \__codedesc_idxfmt_rawat:nnnn
    \cs_set_eq:NN \indexfmtcsraw   \__codedesc_idxfmt_csraw:nnnn
    \cs_set_eq:NN \indexfmtcsrawat \__codedesc_idxfmt_csrawat:nnnn
    \cs_set_eq:NN \indexgenkey     \__codedesc_idx_genkey:Ne
  }

%%%%%%%%
%%%  So we have a default set
%%%%%%%%
\__codedesc_index_setcmds:


%%%%%%%%
%%%
%%%  This has to be 'here' so it won't generate a warning
%%%
%%%%%%%%
\bool_if:NTF \l__codedesc_pkgopt_indexset_bool
  {
    \__codedesc_group_define:nn {code}    {index, index~ fmt=\__codedesc_idxfmt_csraw:nnnn}
    \__codedesc_group_define:nn {keys}    {index, index~ fmt=\__codedesc_idxfmt_raw:nnnn}
    \__codedesc_group_define:nn {option}  {index, index~ fmt=\__codedesc_idxfmt_raw:nnnn}
    \__codedesc_group_define:nn {env}     {index, index~ fmt=\__codedesc_idxfmt_raw:nnnn}
  }
  {}




\bool_if:NTF \l__codedesc_pkgopt_indexset_bool
  {
    \cs_new_protected:Npn \__codedesc_index_if_set:n #1
      {
        \bool_if:NTF \l__codedesc_index_bool
          { \__codedesc_index:n {#1} }
          {}
      }
  }
  {
    \cs_set_eq:NN \__codedesc_index_if_set:n \use_none:n
  }


\cs_new_protected:Npn \__codedesc_index:n
  {
    \__codedesc_indexfmt:eeen
      \l__codedesc_indexname_tl
      \l__codedesc_indexprefix_tl
      \l__codedesc_indexgrp_tl
  }


    %%%%%%%
    %%% codedescribe/tsobj common keys
    %%%%%%%

\keys_define:nn { codedesc / format }
{
  strut .usage:n                  = general ,
  strut .code:n                   =
    {
      \tl_set:Nn \l__codedesc_strut_tl { \strut }
    },

    TF            .usage:n  = general ,
    TF            .code:n   =
      {
        \bool_set_true:N \l__codedesc_descopt_TF_bool
        \tl_set:Nn \l__codedesc_descopt_TF_tl { TF }
      } ,

    noTF          .usage:n  = general ,
    noTF          .code:n   =
      {
        \bool_set_true:N \l__codedesc_descopt_TF_bool
        \tl_set:Nn \l__codedesc_descopt_TF_tl { noTF }
      } ,

    pTF           .usage:n  = general ,
    pTF           .code:n   =
      {
        \bool_set_true:N \l__codedesc_descopt_TF_bool
        \tl_set:Nn \l__codedesc_descopt_TF_tl { pTF }

        \tl_set:Nn \l__codedesc_descopt_exp_tl
          { ~\hfill{\__codedesc_note_fmt:\ding{72}} }

      } ,

    nopTF         .usage:n  = general ,
    nopTF         .code:n   =
      {
        \bool_set_true:N \l__codedesc_descopt_TF_bool
        \tl_set:Nn \l__codedesc_descopt_TF_tl { nopTF }

        \tl_set:Nn \l__codedesc_descopt_exp_tl
          { ~\hfill{\__codedesc_note_fmt:\ding{72}} }
      } ,

    variants .usage:n         = load ,
    variants .value_required:n = true ,
    variants .choice: ,
    variants / none
      .code:n = { \bool_set_false:N \l__codedesc_descopt_variants_bool } ,
    variants / compact
      .code:n = {
                  \bool_set_true:N \l__codedesc_descopt_variants_bool
                  \bool_set_true:N \l__codedesc_descopt_compact_bool
                } ,
    variants / list
      .code:n = {
                  \bool_set_true:N \l__codedesc_descopt_variants_bool
                  \bool_set_false:N \l__codedesc_descopt_compact_bool
                } ,

  unknown.usage:n                 = general ,
	unknown.code:n                  =
    {
     \cs_set:Npn \__codedesc_metacolor: { \__codecmm_color_select:n{c__codedesc_none_color} }
     \msg_error:nnxx { codedesc / errors } {object-err} {format}{\l_keys_key_str}
    },
}

\bool_if:NTF \l__codedesc_pkgopt_indexset_bool
  {
    \keys_define:nn { codedesc / format }
      {
        index .usage:n                  = general ,
        index .value_forbidden:n        = true ,
        index .code:n                   =
          {
            \bool_set_true:N \l__codedesc_index_bool
          } ,

        no~ index .usage:n              = general ,
        no~ index .value_forbidden:n    = true ,
        no~ index .code:n               =
          {
            \bool_set_false:N \l__codedesc_index_bool
          } ,

        index~ group .usage:n           = general ,
        index~ group .value_required:n  = true ,
        index~ group .code: n =
          {
            \tl_if_empty:nTF { #1 }
              {
                \tl_clear:N \l__codedesc_indexgrp_tl
              }
              {
                \tl_set:Nn \l__codedesc_indexgrp_tl { #1 }
              }
          } ,

        index~ gen~ group .usage:n           = general ,
        index~ gen~ group .value_required:n  = true ,
        index~ gen~ group .code: n =
          {
            \__codedesc_idx_genkey:Ne \l__codedesc_indexgrp_tl { #1 }
          } ,

        index~ name .usage:n            = general ,
        index~ name .value_required:n   = true ,
        index~ name .code:n = {
          \tl_if_empty:nTF { #1 }
            {
              \tl_clear:N \l__codedesc_indexname_tl
            }
            {
              \tl_set:Nn \l__codedesc_indexname_tl { [#1] }
            }
        } ,

        index~ prefix .usage:n          = general ,
        index~ prefix .value_required:n = true ,
        index~ prefix .tl_set:N         = \l__codedesc_indexprefix_tl ,

        index~ gen~ prefix .usage:n           = general ,
        index~ gen~ prefix .value_required:n  = true ,
        index~ gen~ prefix .code: n =
          {
            \__codedesc_idx_genkey:Ne \l__codedesc_indexprefix_tl { #1 }
          } ,
      }
  }
  {
    \keys_define:nn { codedesc / format }
      { % silently ignore them
        index .usage:n                  = general ,
        index .value_forbidden:n        = true ,
        index .code:n                   = { } ,

        no~ index .usage:n              = general ,
        no~ index .value_forbidden:n    = true ,
        no~ index .code:n               =  { } ,

        index~ group .usage:n           = general ,
        index~ group .value_required:n  = true ,
        index~ group .code: n           =  { } ,

        index~ gen~ group .usage:n           = general ,
        index~ gen~ group .value_required:n  = true ,
        index~ gen~ group .code: n           =  { } ,

        index~ name .usage:n            = general ,
        index~ name .value_required:n   = true ,
        index~ name .code:n             =  { } ,

        index~ prefix .usage:n          = general ,
        index~ prefix .value_required:n = true ,
        index~ prefix .code:n           =  { }  ,

        index~ gen~ prefix .usage:n          = general ,
        index~ gen~ prefix .value_required:n = true ,
        index~ gen~ prefix .code:n           =  { }  ,
      }
  }

    %%%%%%%
    %%% codedescribe keys
    %%%%%%%

\keys_define:nn {}
  { codedesc / desc format .inherit:n = codedesc / format }
\keys_define:nn { codedesc / desc format }
  {
    new           .usage:n  = general ,
    new           .code:n   =
      {
        \bool_set_true:N  \l__codedesc_descopt_notes_bool
        \bool_set_true:N  \l__codedesc_descopt_date_new_bool
        \seq_put_right:Nn \l__codedesc_descopt_date_new_seq
          {#1}
        \seq_put_right:Nn \l__codedesc_descopt_inseq_seq
          {\l__codedesc_label_new_tl :~ #1}
      } ,

    update        .usage:n  = general ,
    update        .code:n   =
      {
        \bool_set_true:N  \l__codedesc_descopt_notes_bool
        \bool_set_true:N  \l__codedesc_descopt_update_bool
        \seq_put_right:Nn \l__codedesc_descopt_update_seq
          {#1}
        \seq_put_right:Nn \l__codedesc_descopt_inseq_seq
          {\l__codedesc_label_update_tl :~ #1}
      } ,

    note          .usage:n  = general ,
    note          .code:n   =
      {
        \bool_set_true:N  \l__codedesc_descopt_notes_bool
        \bool_set_true:N  \l__codedesc_descopt_sidenote_bool
        \seq_put_right:Nn \l__codedesc_descopt_sidenote_seq
          {#1}
        \seq_put_right:Nn \l__codedesc_descopt_inseq_seq
          {\l__codedesc_label_note_tl :~ #1}
      } ,

    keys~ seq .usage:n         = load ,
    keys~ seq .value_required:n = true ,
    keys~ seq .choice: ,
    keys~ seq / grouped
      .code:n = { \bool_set_false:N \l__codedesc_descopt_inseq_bool } ,
    keys~ seq / as~ is
      .code:n = { \bool_set_true:N \l__codedesc_descopt_inseq_bool } ,

    rulecolor     .usage:n  = general ,
    rulecolor     .code:n   =
      {
        \cs_set:Npn \__codedesc_rulecolor:
          { \__codecmm_color_select:n{#1} }
      } ,

    EXP           .usage:n  = general ,
    EXP           .code:n   =
      {
        \tl_set:Nn \l__codedesc_descopt_exp_tl
          { ~\hfill{\__codedesc_note_fmt:\ding{72}} }
      } ,

    rEXP          .usage:n  = general ,
    rEXP          .code:n   =
      {
        \tl_set:Nn \l__codedesc_descopt_exp_tl
          { ~\hfill{\__codedesc_note_fmt:\ding{73}} }
      } ,

    force~ margin .usage:n  = general ,
    force~ margin .code:n   =
      {
        \bool_set_true:N
          \l__codedesc_descopt_force_margin_bool
      } ,

    unknown       .usage:n  = general ,
  	unknown       .code:n   =
      {
        \cs_set:Npn \__codedesc_metacolor:
          { \__codecmm_color_select:n{c__codedesc_none_color} }
        \msg_error:nnxx { codedesc / errors } {object-err}
          {desc ~ format}{\l_keys_key_str}
      } ,
  }


    %%%%%%%
    %%% tsobj and friends keys
    %%%%%%%

\keys_define:nn {}
  { codedesc / list format .inherit:n = codedesc / format }
\keys_define:nn { codedesc / list format }
  {

    mid~ sep.usage:n        = general ,
    mid~ sep.code:n         =
      {
        \tl_set:Nn \l__codedesc_sep_tl { ~ #1 ~ }
      } ,

    sep.usage:n             = general ,
    sep.code:n              =
      {
        \tl_set:Nn \l__codedesc_lastsep_tl { ~ #1 ~ }
      } ,

    or.usage:n              = general ,
    or.code:n               =
      {
        \tl_set:Nn \l__codedesc_lastsep_tl { ~ \l__codedesc_label_or_tl{} ~ }
      } ,

    comma.usage:n           = general ,
    comma.code:n            =
      {
        \tl_set:Nn \l__codedesc_lastsep_tl { , ~ }
      } ,

    meta~ or .usage:n       = general ,
    meta~ or .code:n        =
      {
        \tl_set:Nn \l__codedesc_sep_tl { | }
        \tl_set:Nn \l__codedesc_lastsep_tl { | }
        \tl_set:Nn \l__codedesc_Lbrace_tl {\ensuremath\langle}
        \tl_set:Nn \l__codedesc_Rbrace_tl {\ensuremath\rangle}
      } ,

    bnf~ or .usage:n        = general ,
    bnf~ or .code:n         =
      {
        \tl_set:Nn \l__codedesc_sep_tl { | }
        \tl_set:Nn \l__codedesc_lastsep_tl { | }
        \tl_set:Nn \l__codedesc_Lbrace_tl {[}
        \tl_set:Nn \l__codedesc_Rbrace_tl {]}
      } ,

    par~ or .usage:n        = general ,
    par~ or .code:n         =
      {
        \tl_set:Nn \l__codedesc_sep_tl { | }
        \tl_set:Nn \l__codedesc_lastsep_tl { | }
        \tl_set:Nn \l__codedesc_Lbrace_tl {(}
        \tl_set:Nn \l__codedesc_Rbrace_tl {)}
      } ,

    unknown.usage:n         = general ,
  	unknown.code:n          =
      {
       \cs_set:Npn \__codedesc_metacolor: { \__codecmm_color_select:n{c__codedesc_none_color} }
       \msg_error:nnxx { codedesc / errors } {object-err} {list ~ format}{\l_keys_key_str}
      } ,
  }

    %%%%%%%
    %%% variables/commands initializing
    %%%%%%%

\cs_new_protected:Npn \__codedesc_metafmt_clear:
  {
    \cs_set_eq:NN     \__codedesc_metasize: \small
    \cs_set_eq:NN     \__codedesc_metafont: \ttfamily

    \cs_set_eq:NN     \__codedesc_faint_test:N \use_none:n

    \cs_set_eq:NN     \__codedesc_metashape: \prg_do_nothing:
    \cs_set_eq:NN     \__codedesc_metacolor: \relax
    \cs_set_eq:NN     \__codedesc_metafaintcolor: \relax

    \cs_set_eq:NN     \__codedesc_shape_preadj: \prg_do_nothing:
    \cs_set_eq:NN     \__codedesc_shape_posadj: \prg_do_nothing:

    \cs_set:Npn       \__codedesc_rulecolor: { \__codedesc_metacolor: }

    \cs_set:Npn       \__codedesc_typeset:n {}
    \cs_generate_variant:Nn \__codedesc_typeset:n {V}

    \cs_set_eq:NN     \__codedesc_seq_from_clist:Nn \seq_set_from_clist:Nn


    \tl_clear:N   \l__codedesc_Lbracket_tl
    \tl_clear:N   \l__codedesc_Rbracket_tl
    \tl_set:Nn    \l__codedesc_sep_tl {,~}
    \tl_set:Nn    \l__codedesc_lastsep_tl {~ \l__codedesc_label_and_tl{} ~}
    \tl_clear:N   \l__codedesc_descopt_exp_tl
    \tl_clear:N   \l__codedesc_Lbrace_tl
    \tl_clear:N   \l__codedesc_Rbrace_tl
    \tl_clear:N   \l__codedesc_strut_tl

    \tl_clear:N   \l__codedesc_descopt_TF_tl
    \bool_set_false:N \l__codedesc_descopt_TF_bool

    \bool_set_false:N \l__codedesc_descopt_notes_bool
    \bool_set_false:N \l__codedesc_descopt_date_new_bool
    \bool_set_false:N \l__codedesc_descopt_update_bool
    \bool_set_false:N \l__codedesc_descopt_sidenote_bool

    \bool_set_false:N \l__codedesc_index_bool

    \tl_clear:N   \l__codedesc_indexgrp_tl
    \tl_clear:N   \l__codedesc_indexname_tl
    \tl_clear:N   \l__codedesc_indexprefix_tl

    \cs_set_eq:NN           \__codedesc_indexfmt:nnnn \__codedesc_idxfmt_raw:nnnn
    \cs_generate_variant:Nn \__codedesc_indexfmt:nnnn { eee }
  }

\__codedesc_metafmt_clear:



\cs_new_protected:Npn \__codedesc_metafmt:n #1
  {
    \__codedesc_metafmt_set:n {#1}
    \__codedesc_metafmt:
  }
\cs_generate_variant:Nn \__codedesc_metafmt:n {V}

\cs_new_protected:Npn \__codedesc_metafmt:
  {
    \__codedesc_metasize:
    \__codedesc_metafont:
    \__codedesc_metashape:
    \__codedesc_metacolor: {}
  }


\cs_new_protected:Npn \__codedesc_metafmt_get:nnN #1#2#3
  {
    \keys_precompile:nnN {codedesc / #1}{#2} #3
    \cs_set:Npe  \__codedesc_metafmt:
      {
        \exp_not:o \__codedesc_metasize:
        \exp_not:o \__codedesc_metafont:
        \exp_not:o \__codedesc_metashape:
        \exp_not:o \__codedesc_metacolor: {}
      }
  }

\cs_new_protected:Npn \__codedesc_metafmt_get:nN #1#2
  {
    \keys_precompile:nnN {codedesc / format}{#1} #2
    \cs_set:Npe  \__codedesc_metafmt:
      {
        \exp_not:o \__codedesc_metasize:
        \exp_not:o \__codedesc_metafont:
        \exp_not:o \__codedesc_metashape:
        \exp_not:o \__codedesc_metacolor: {}
      }
  }
\cs_generate_variant:Nn \__codedesc_metafmt_get:nN {V}


\cs_new_protected:Npn \__codedesc_metafmt_set:nn #1#2
  {
    \keys_set:nn {codedesc / #1}{#2}

    \cs_set:Npe  \__codedesc_metafmt:
      {
        \exp_not:o \__codedesc_metasize:
        \exp_not:o \__codedesc_metafont:
        \exp_not:o \__codedesc_metashape:
        \exp_not:o \__codedesc_metacolor: {}
      }
  }

\cs_new_protected:Npn \__codedesc_metafmt_set:n #1
  {
    \keys_set:nn {codedesc / format}{#1}

    \cs_set:Npe  \__codedesc_metafmt:
      {
        \exp_not:o \__codedesc_metasize:
        \exp_not:o \__codedesc_metafont:
        \exp_not:o \__codedesc_metashape:
        \exp_not:o \__codedesc_metacolor: {}
      }
  }
\cs_generate_variant:Nn \__codedesc_metafmt_set:n {V}


    %%%%%%%
    %%% < meta >
    %%%%%%%
\cs_new_protected:Npn \__codedesc_meta:n #1
  {
    \mode_if_math:TF
      {   \langle     #1     \rangle   } %% We shouldn't be here, but...
      { $ \langle $   #1   $ \rangle $ }
  }
\cs_generate_variant:Nn \__codedesc_meta:n {V}

    %%%%%%%
    %%% < meta > 'detokenized'
    %%%%%%%
\cs_new_protected:Npn \__codedesc_meta*:n #1
  {
    \mode_if_math:TF
      {   \langle     \tl_to_str:n {#1}     \rangle   } %% We shouldn't be here, but...
      { $ \langle $   \tl_to_str:n {#1}   $ \rangle $ }
  }
\cs_generate_variant:cn {__codedesc_meta*:n} {V}


%%% __faint__  ( ... ) => codedesc_faint:n { \1 }
%%% __faint:           => codedesc_faint:n
%%% __faintb:          => codedesc_faintbreack:n
\regex_const:Nn \c__codedesc_faint_a_regex {__faint:}
\regex_const:Nn \c__codedesc_faint_b_regex {__faintb:}
\regex_const:Nn \c__codedesc_faint_c_regex {__faint__ (.*?) :}

\cs_new:Npn \__codedesc_faint:n #1
  {
      \smash
        { \__codedesc_metafaintcolor: { #1 } }
  }

\cs_new:Npn \__codedesc_faintbreak:n #1
  {
    \skip_horizontal:N \c_zero_skip
      \__codedesc_faint:n {#1}
    \skip_horizontal:N \c_zero_skip
  }

\cs_new:Npn \__codedesc_faint_replace:N #1
  {
    \regex_replace_all:NnNTF \c__codedesc_faint_c_regex {\c{__codedesc_faint:n}\cB\{\1\cE\}:} #1
      {
        \regex_replace_all:NnNTF \c__codedesc_faint_a_regex {\c{__codedesc_faint:n}} #1
          {
            \regex_replace_all:NnN \c__codedesc_faint_b_regex {\c{__codedesc_faintbreak:n}} #1
          }
          { }
      }
      { }
  }

    %%%%%%%
    %%% code 'detokenized'
    %%%%%%%
\regex_const:Nn \c__codedesc_tf_regex {TF$}
\regex_const:Nn \c__codedesc_bnfsep_regex {\|}

\cs_new_protected:Npn \__codedesc_macro_typeset:n #1
  {
    \tl_set:Nn \l__codedesc_tmpb_tl {#1}
    \str_remove_all:Nn \l__codedesc_tmpb_tl {~}

    \__codedesc_faint_test:N \l__codedesc_tmpb_tl

    \regex_replace_once:NnNTF \c__codedesc_tf_regex {}\l__codedesc_tmpb_tl
      {
        \tl_use:N \l__codedesc_tmpb_tl\textsl{\underline{TF}}
      }
      { \l__codedesc_tmpb_tl }
  }
\cs_generate_variant:Nn \__codedesc_macro_typeset:n {V}

    %%%%%%%
    %%% just 'detokenized'
    %%%%%%%
\cs_new_protected:Npn \__codedesc_verb_nospc_typeset:n #1
  {
    \tl_set:Nn \l__codedesc_tmpb_tl {#1}
    \str_remove_all:Nn \l__codedesc_tmpb_tl {~}
    \l__codedesc_tmpb_tl
  }
\cs_generate_variant:Nn \__codedesc_verb_nospc_typeset:n {V}

    %%%%%%%
    %%% processing as a list
    %%%%%%%
\cs_new_protected:Npn \__codedesc_list_typeset:nnn #1#2#3
  {
    \__codedesc_seq_from_clist:Nn \l__codedesc_tmpa_seq {#1}

    \l__codedesc_strut_tl
    \l__codedesc_Lbrace_tl

    \seq_pop_left:NNTF \l__codedesc_tmpa_seq \l__codedesc_tmpa_tl
      {
        {
          \__codedesc_metafmt:
          \__codedesc_shape_preadj:
          \__codedesc_typeset:V \l__codedesc_tmpa_tl
          \__codedesc_shape_posadj:
        }
        \seq_pop_right:NNTF \l__codedesc_tmpa_seq \l__codedesc_tmpb_tl   % last one, if any
          {
            \seq_map_inline:Nn \l__codedesc_tmpa_seq
              {
                #2
                {
                  \__codedesc_metafmt:
                  \__codedesc_shape_preadj:
                  \__codedesc_typeset:n {##1}
                  \__codedesc_shape_posadj:
                }
              }
            #3
            {
              \__codedesc_metafmt:
              \__codedesc_shape_preadj:
              \__codedesc_typeset:V \l__codedesc_tmpb_tl
              \__codedesc_shape_posadj:
            }
          }
          {} %% there was only one
      }
      {}  %% none there

      \l__codedesc_Rbrace_tl
  }


\cs_new_protected:Npn \__codedesc_args_typeset:nnnn #1#2#3#4
  {
    \group_begin:
      \seq_set_from_clist:Nn \l__codedesc_tmpa_seq {#3}
      \__codedesc_metafmt_set:n {#1}
      \l__codedesc_strut_tl
      \__codedesc_metafmt:
      \seq_map_inline:Nn \l__codedesc_tmpa_seq
        {~\!\!#2 \__codedesc_meta:n {##1} #4 }
    \group_end:
  }




%%%%%%%
%%%  'pure' aftergroup (for now, used only by codedescribe env)
%%%%%%%
\int_new:N \l__codedesc_grplevel_int
\cs_new_protected:Npn \__codedesc_groupmark:
  {
    \int_set_eq:NN \l__codedesc_grplevel_int \currentgrouplevel
    \int_incr:N \l__codedesc_grplevel_int
  }

\cs_new_protected:Npn \__codedesc_aftergroup:N #1
  {
    \if_int_compare:w \l__codedesc_grplevel_int < \currentgrouplevel
        \group_insert_after:N \__codedesc_aftergroup:N
        \group_insert_after:N #1
    \else:
        \group_insert_after:N #1
    \fi:
  }



    %%%%%%%
    %%%  Variables used in the codedescribe/describelist environments
    %%%%%%%

\bool_new:N   \l__codedesc_longblock_bool

\coffin_new:N \l__codedesc_margin_coffin
\coffin_new:N \l__codedesc_text_coffin
\coffin_new:N \l__codedesc_syntax_coffin
\bool_new:N   \g__codedesc_syntax_bool
\dim_new:N    \l__codedesc_syntax_wd_dim
\dim_new:N    \l__codedesc_margin_wd_dim

\seq_new:N    \l__codedesc_descopt_date_new_seq
\seq_new:N    \l__codedesc_descopt_update_seq
\seq_new:N    \l__codedesc_descopt_sidenote_seq
\seq_new:N    \l__codedesc_descopt_inseq_seq


\coffin_new:N \l__codedesc_describe_coffin
\dim_new:N    \l__codedesc_describelabel_wd_dim
\dim_new:N    \l__codedesc_describelist_wd_dim
\tl_new:N     \l__codedesc_ragged_tl

\dim_new:N    \l__codedesc_tmpa_dim
\dim_new:N    \l__codedesc_tmpb_dim

\bool_new:N   \l__codedesc_codedescribe_activ_bool

\bool_new:N \l__codedesc_force_margin_bool

\bool_new:N \l__codedesc_bnfbar_bool



    %%%%%%%
    %%%  User/Document level commands/environments
    %%%%%%%


\NewDocumentCommand \setcolorscheme {m}
  { \__codedesc_set_colorscheme:n {#1} }

\NewDocumentCommand \newcolorscheme {mm}
  { \__codedesc_new_colorscheme:nn {#1}{#2} }

\NewDocumentCommand \defgroupfmt {mm}
  { \__codedesc_group_define:nn {#1} {#2} }

\NewDocumentCommand \dupgroupfmt {mm}
  { \__codedesc_group_dup:nn {#1} {#2} }

\NewDocumentCommand \defobjectfmt {mmm}
  { \__codedesc_object_define:nnn {#1} {#2} {#3} }


%%%%%%%
%%%
%%%  It will always consume two tokens after it
%%%  If index set, it will be a true TF conditional
%%%  otherwise, it will execute the 2nd argument
%%%
%%%%%%%
\bool_if:NTF  \l__codedesc_pkgopt_indexset_bool
  {
    \cs_new_protected:Npn \__codedesc_index_if_set:TF
      { \bool_if:NTF \l__codedesc_index_bool }
  }
  {
    \cs_new_eq:NN \__codedesc_index_if_set:TF \use_ii:nn
  }


%%%%%%%
%%%  This will create a seq, processing variants (if option set)
%%%%%%%
\regex_const:Nn \c__codedesc_variant_regex {(\\[a-zA-Z_]+):([nNwpD]*)\{([noexvVNcwpD,\-]*)\}}

\cs_new:Npn \__codedesc_variant_put_right:Nnn #1#2#3
  {
    \seq_put_right:Nn #1 {#2:#3}
  }
\cs_generate_variant:Nn \__codedesc_variant_put_right:Nnn {Noo, No}

\cs_new:Npn \__codedesc_variant_put_right_par:Nnn #1#2#3
  {
    \seq_put_right:Nn #1 {#2: __faint: (#3 __faint: )}
  }
\cs_generate_variant:Nn \__codedesc_variant_put_right_par:Nnn {Noo}

\cs_new_protected:Npn \__codedesc_macro_seq_from_clist:Nn #1#2
  {
    \bool_if:NTF \l__codedesc_descopt_variants_bool
      {
        \seq_set_from_clist:Nn \l__codedesc_tmpb_seq {#2}
        \seq_clear:N #1
        \seq_map_inline:Nn \l__codedesc_tmpb_seq
          {
            \tl_set:Nn  \l__codedesc_tmpa_tl {##1}
            \str_remove_all:Nn \l__codedesc_tmpa_tl {~}

            \regex_split:NoNTF \c__codedesc_variant_regex \l__codedesc_tmpa_tl \l__codedesc_tmpc_seq
              {
                \seq_pop_left:NN \l__codedesc_tmpc_seq \l__codedesc_tmpa_tl   % garbage
                \seq_pop_left:NN \l__codedesc_tmpc_seq \l__codedesc_tmpa_tl   % cmd-name
                \seq_pop_right:NN \l__codedesc_tmpc_seq \l__codedesc_tmpc_tl  % garbage
                \seq_pop_right:NN \l__codedesc_tmpc_seq \l__codedesc_tmpa_clist  % variants' signatures
                \seq_pop_right:NN \l__codedesc_tmpc_seq \l__codedesc_tmpb_tl  % base signature

                \__codedesc_variant_put_right:Noo #1 \l__codedesc_tmpa_tl \l__codedesc_tmpb_tl
                \seq_set_from_clist:NN \l__codedesc_tmpc_seq \l__codedesc_tmpa_clist

                \tl_clear:N \l__codedesc_tmpD_tl

                \seq_pop_left:NNTF \l__codedesc_tmpc_seq \l__codedesc_tmpD_tl % first one, if any
                  {
                    \tl_set:Ne \l__codedesc_tmpa_tl { __faint__ \l__codedesc_tmpa_tl }
                    \cs_set_eq:NN \__codedesc_faint_test:N \__codedesc_faint_replace:N

                    \seq_pop_right:NNTF \l__codedesc_tmpc_seq \l__codedesc_tmpE_tl   % last one, if any
                      { %% if here, then at least 2
                        \bool_if:NTF \l__codedesc_descopt_compact_bool
                          {
                            \bool_set_true:N \l__codedesc_bnfbar_bool
                            \seq_map_inline:Nn \l__codedesc_tmpc_seq  %% might be empty
                              {
                                \str_compare:nNnTF {####1} = {-}
                                  {
                                    \__codedesc_variant_put_right_par:Noo #1 \l__codedesc_tmpa_tl \l__codedesc_tmpD_tl
                                    \tl_clear:N \l__codedesc_tmpD_tl
                                    \bool_set_false:N \l__codedesc_bnfbar_bool
                                  }
                                  {
                                    \bool_if:NTF \l__codedesc_bnfbar_bool
                                      { \tl_put_right:Nn \l__codedesc_tmpD_tl {__faintb: |####1} }
                                      {
                                        \tl_put_right:Nn \l__codedesc_tmpD_tl { ####1}
                                        \bool_set_true:N \l__codedesc_bnfbar_bool
                                      }

                                  }
                              }
                            \bool_if:NTF \l__codedesc_bnfbar_bool
                              { \tl_put_right:Nn \l__codedesc_tmpD_tl {__faintb: |} }
                              {}

                            \tl_put_right:No \l__codedesc_tmpD_tl \l__codedesc_tmpE_tl
                            \__codedesc_variant_put_right_par:Noo #1 \l__codedesc_tmpa_tl \l__codedesc_tmpD_tl
                          }
                          {
                            \__codedesc_variant_put_right:Noo #1 \l__codedesc_tmpa_tl \l__codedesc_tmpD_tl
                            \seq_map_inline:Nn \l__codedesc_tmpc_seq  %% might be empty
                              {
                                \str_compare:nNnTF {####1} = {-}
                                  { }
                                  {  \__codedesc_variant_put_right:Non #1 \l__codedesc_tmpa_tl {####1} }
                              }
                            \__codedesc_variant_put_right:Noo #1 \l__codedesc_tmpa_tl \l__codedesc_tmpE_tl
                          }
                      }
                      {
                        \__codedesc_variant_put_right:Noo #1 \l__codedesc_tmpa_tl \l__codedesc_tmpD_tl
                      } %% there was only one
                  }
                  {}  %% none there
              }
              {
                \seq_put_right:Nn #1 {##1}
              }
          }
      }
      {
        \seq_set_from_clist:Nn #1 {#2}
      }

      \bool_if:NTF \l__codedesc_descopt_TF_bool
        {
          \seq_set_eq:NN \l__codedesc_tmpb_seq #1
          \seq_clear:N   #1
          \str_case:Nn  \l__codedesc_descopt_TF_tl
            {
              {TF}
                {
                  \seq_map_inline:Nn \l__codedesc_tmpb_seq
                    {
                      \seq_put_right:Nn #1 {##1TF}
                    }
                }
              {noTF}
                {
                  \seq_map_inline:Nn \l__codedesc_tmpb_seq
                    {
                      \seq_put_right:Nn #1 {##1}
                      \seq_put_right:Nn #1 {##1TF}
                    }
                }
              {pTF}
                {
                  \seq_map_inline:Nn \l__codedesc_tmpb_seq
                    {
                      \str_set:Nn \l__codedesc_tmpa_tl {##1}
                      \regex_replace_once:NnN \c__codedesc_colon_regex {_p:} \l__codedesc_tmpa_tl
                      \seq_put_right:NV #1 \l__codedesc_tmpa_tl
                      \seq_put_right:Nn #1 {##1TF}
                    }
                }
              {nopTF}
                {
                  \seq_map_inline:Nn \l__codedesc_tmpb_seq
                    {
                      \str_set:Nn \l__codedesc_tmpa_tl {##1}
                      \regex_replace_once:NnN \c__codedesc_colon_regex {_p:} \l__codedesc_tmpa_tl
                      \seq_put_right:Nn #1 {##1}
                      \seq_put_right:NV #1 \l__codedesc_tmpa_tl
                      \seq_put_right:Nn #1 {##1TF}
                    }
                }
            }
        }
        {}
  }



\cs_new_protected:Npn \__codedesc_marginblock:nn #1#2
  {
        \begin{tabular}{ #1 }
          \__codecmm_hline:nnnn {\__codedesc_rulecolor:}{0.5ex}{2}{0.25ex}
          #2  %%% for spacing correction :(

          \__codedesc_index_if_set:TF
            {
              \seq_map_inline:Nn \l__codedesc_tmpa_seq
                {
                  \__codedesc_index:n {##1}

                  \__codedesc_typeset:n {##1} \l__codedesc_descopt_exp_tl \\
                }
            }
            {
              \seq_map_inline:Nn \l__codedesc_tmpa_seq
                {

                  \__codedesc_typeset:n {##1} \l__codedesc_descopt_exp_tl \\
                }
            }

          \bool_if:NTF \l__codedesc_descopt_notes_bool
            {
              \\[-2.5ex]
              \__codecmm_hline:nnnn {\__codecmm_color_select:n{black}}{0.5ex}{0.25}{0.25ex}

              \bool_if:NTF \l__codedesc_descopt_inseq_bool
                {
                  \seq_map_inline:Nn \l__codedesc_descopt_inseq_seq
                    { \__codedesc_note_fmt:\__codecmm_color_select:n{black} ##1\\[-1ex] }
                }
                {
                  \bool_if:NT \l__codedesc_descopt_date_new_bool
                    {
                      \seq_map_inline:Nn \l__codedesc_descopt_date_new_seq
                        {\__codedesc_note_fmt:\__codecmm_color_select:n{black} \l__codedesc_label_new_tl :~ ##1\\[-1ex]}
                    }
                  \bool_if:NT \l__codedesc_descopt_update_bool
                    {
                      \seq_map_inline:Nn \l__codedesc_descopt_update_seq
                        {\__codedesc_note_fmt:\__codecmm_color_select:n{black} \l__codedesc_label_update_tl :~ ##1\\[-1ex]}
                    }
                  \bool_if:NT \l__codedesc_descopt_sidenote_bool
                    {
                      \seq_map_inline:Nn \l__codedesc_descopt_sidenote_seq
                        {\__codedesc_note_fmt:\__codecmm_color_select:n{black} \l__codedesc_label_note_tl :~ ##1\\[-1ex]}
                    }
                }
              \\[-1.5ex]
            }
            {
              \\[-2.5ex]
            }
          \__codecmm_hline:nnnn {\__codedesc_rulecolor:}{-0.25ex}{2}{1ex}
        \end{tabular}
  }


\NewDocumentEnvironment {codedescribe}{O{code}m}
  {
    \mode_if_horizontal:TF
      {\unskip\skip_vertical:n{\l__codecmm_mid_skip}}
      {\skip_vertical:n{\l__codecmm_mid_skip}}

    \bool_if:NTF \l__codedesc_codedescribe_activ_bool
      {
        \msg_warning:nnnxx { codedesc / warnings } {nested-env}
          {syntax:01}{codedescribe~ env}{codedescribe~ env}
      }
      {
        \bool_set_true:N \l__codedesc_codedescribe_activ_bool
      }

    \__codedesc_groupmark:  %for the aftergroup trick
    \__codecmm_set_textcolwidth:
    \hcoffin_set:Nn \l__codedesc_margin_coffin
      {
        \__codedesc_metafmt_set:nn {desc format}{#1}
        \__codedesc_metafmt:

        %%% This will 'locally copy' \l__codedesc_descopt_force_margin_bool
        %%% into \l__codedesc_force_margin_bool
        %%% ==> reentrant friendly, otherwise set_false could be ommited
        \bool_if:NTF \l__codedesc_descopt_force_margin_bool
          {
            \__codedesc_aftergroup:N \bool_set_true:N
            \__codedesc_aftergroup:N \l__codedesc_force_margin_bool
          }
          {
            \__codedesc_aftergroup:N \bool_set_false:N
            \__codedesc_aftergroup:N \l__codedesc_force_margin_bool
          }

        \__codedesc_macro_seq_from_clist:Nn
          \l__codedesc_tmpa_seq {#2}
        \__codedesc_marginblock:nn
          { @{} l @{} }
          { }
      }
    \dim_set:Nn \l__codedesc_margin_wd_dim {\coffin_wd:N \l__codedesc_margin_coffin}

%    \coffin_mark_handle:Nnnn  \l__codedesc_margin_coffin {r}{T}{blue}
%    \coffin_mark_handle:Nnnn  \l__codedesc_margin_coffin {r}{B}{green}
%    \coffin_mark_handle:Nnnn  \l__codedesc_margin_coffin {r}{t}{red}

%    \dim_compare:nNnTF \l__codedesc_margin_wd_dim > \l__codecmm_marginwidth_dim
    \__codecmm_dim_compare:NNNTF \l__codedesc_margin_wd_dim > \l__codecmm_marginwidth_dim
      {
        \bool_if:NTF \l__codedesc_force_margin_bool
          { %% well, user's choice...
            \bool_set_false:N \l__codedesc_longblock_bool
            \dim_set:Nn \l__codedesc_syntax_wd_dim {\l__codecmm_textcolwidth_dim}
          }
          {
            \bool_set_true:N \l__codedesc_longblock_bool

            \dim_compare:nNnTF \l__codedesc_margin_wd_dim > \l__codecmm_maxcodeblock_dim
              {
                \hcoffin_set:Nn \l__codedesc_margin_coffin
                  {
                    \__codedesc_metafmt_set:nn {desc format}{#1}
                    \__codedesc_metafmt:

                    \__codedesc_macro_seq_from_clist:Nn
                      \l__codedesc_tmpa_seq {#2}
                    \__codedesc_marginblock:nn
                      { @{} p{\l__codecmm_maxcodetab_dim} @{} }
                      { \\[-2.85ex] }
                  }
                \dim_set:Nn \l__codedesc_margin_wd_dim {\coffin_wd:N \l__codedesc_margin_coffin}
              }
              {}
            \dim_set:Nn \l__codedesc_syntax_wd_dim {\l__codecmm_textcolwidth_dim - (\l__codedesc_margin_wd_dim - \l__codecmm_marginwidth_dim) }
          }
      }
      {
        \bool_set_false:N \l__codedesc_longblock_bool
        \dim_set:Nn \l__codedesc_syntax_wd_dim {\l__codecmm_textcolwidth_dim}
      }

    \bool_gset_false:N \g__codedesc_syntax_bool
    \vcoffin_set:Nnw \l__codedesc_text_coffin {\l__codecmm_textcolwidth_dim}

    \setlength\parindent{0pt}
  }
  {
    \vcoffin_set_end:
    \bool_if:NF \g__codedesc_syntax_bool
      {
        \vcoffin_gset:Nnn \l__codedesc_syntax_coffin {\l__codedesc_syntax_wd_dim}
          {
            \begin{tabular} { @{} l @{} }
              \__codecmm_hline:nnnn {\__codecmm_color_select:n{white}}{0.5ex}{2}{-1.5ex}
              \__codedesc_metacolor:
              \begin{minipage}[t]{\l__codedesc_syntax_wd_dim}
                \obeylines\obeyspaces\setlength\parindent{-2em}
              \end{minipage}\\[-2.5ex]
                  \\
                  \__codecmm_hline:nnnn {\__codecmm_color_select:n{white}}{0ex}{2}{1ex}
            \end{tabular}
          }
      }

%    \coffin_mark_handle:Nnnn  \l__codedesc_syntax_coffin {l}{T}{blue}
%    \coffin_mark_handle:Nnnn  \l__codedesc_syntax_coffin {l}{B}{green}
%    \coffin_mark_handle:Nnnn  \l__codedesc_syntax_coffin {l}{t}{red}

    \bool_if:NTF \l__codedesc_longblock_bool
      { % __describeblock starting at marginpar
        \dim_compare:nNnTF { \l__codecmm_marginwidth_dim + \marginparsep - \l__codedesc_margin_wd_dim } < { \l__codecmm_marginminsep_dim }
          {
            \coffin_join:NnnNnnnn
              \l__codedesc_syntax_coffin {l}{t}
              \l__codedesc_margin_coffin {r}{t}
              {-\marginparsep}{0pt}
            \coffin_join:NnnNnnnn
              \l__codedesc_syntax_coffin {l}{b}
              \l__codedesc_text_coffin   {l}{t}
              {\l__codecmm_marginwidth_dim+\marginparsep}{\l__codecmm_baselineskip_dim}
          }
          {
            \dim_set:Nn \l__codedesc_tmpa_dim {\coffin_ht_plus_dp:N \l__codedesc_syntax_coffin}
            \coffin_join:NnnNnnnn
              \l__codedesc_syntax_coffin {l}{t}
              \l__codedesc_margin_coffin {r}{t}
              {-\marginparsep + \l__codedesc_margin_wd_dim - \l__codecmm_marginwidth_dim}{0pt}
            \dim_set:Nn \l__codedesc_tmpb_dim {\coffin_ht_plus_dp:N \l__codedesc_syntax_coffin}
            \coffin_join:NnnNnnnn
              \l__codedesc_syntax_coffin {l}{b}
              \l__codedesc_text_coffin   {l}{t}
              {\l__codecmm_marginwidth_dim+\marginparsep}{\l__codecmm_baselineskip_dim  + \l__codedesc_tmpb_dim - \l__codedesc_tmpa_dim}
          }
        \par\noindent
%\coffin_mark_handle:Nnnn  \l__codedesc_syntax_coffin {r}{T}{blue}
        \coffin_typeset:Nnnnn \l__codedesc_syntax_coffin {l}{t} {-\l__codecmm_marginwidth_dim-\marginparsep}{0pt}
      }
      { % __describeblock at marginpar
        \bool_if:NTF \g__codedesc_syntax_bool
          {
            \coffin_join:NnnNnnnn
              \l__codedesc_syntax_coffin {l}{b}
              \l__codedesc_text_coffin   {l}{t}
              {0pt}{\l__codecmm_baselineskip_dim}
          }
          {
            \coffin_join:NnnNnnnn
              \l__codedesc_syntax_coffin {l}{B}
              \l__codedesc_text_coffin   {l}{T}
              {0pt}{0pt}
          }
        \coffin_attach:NnnNnnnn
          \l__codedesc_syntax_coffin {l}{t}
          \l__codedesc_margin_coffin {r}{t}
          {-\marginparsep}{0pt}
%\coffin_mark_handle:Nnnn  \l__codedesc_syntax_coffin {r}{T}{red}
        \par\noindent
        \coffin_typeset:Nnnnn \l__codedesc_syntax_coffin {l}{t} {0pt}{0pt}
      }

    \skip_vertical:n{\l__codecmm_large_skip}\par
  }



\NewDocumentEnvironment{codesyntax}{O{syntax}}
  {
    \bool_if:NTF \l__codedesc_codedescribe_activ_bool
      {
        \bool_if:NT \g__codedesc_syntax_bool
          {
            \msg_warning:nnn { codedesc / warnings } {syntax dup}
                  {syntax:02}
          }
      }
      {
        \msg_warning:nnnxx { codedesc / warnings } {out of scope}
              {syntax:03}{codesyntax~ env}{codedescribe~ env}
      }

    \vcoffin_gset:Nnw \l__codedesc_syntax_coffin {\l__codedesc_syntax_wd_dim}
    \__codedesc_metafmt:n {#1}
    \hspace*{2em}     %% !!! together with \parindent{-2em}
    \begin{tabular} { @{} l @{} }
      \__codecmm_hline:nnnn {\__codecmm_color_select:n{white}}{0.5ex}{2}{-1.5ex}
      \__codedesc_metacolor:
      \begin{minipage}[t]{\l__codedesc_syntax_wd_dim}
        \obeylines\obeyspaces\setlength\parindent{-2em}
  }
  {
      \end{minipage}\\[-2.5ex]
          \\
          \__codecmm_hline:nnnn {\__codecmm_color_select:n{white}}{0ex}{2}{1ex}
    \end{tabular}
    \vcoffin_gset_end:
    \bool_gset_true:N \g__codedesc_syntax_bool
  }



\bool_if:NTF \l__codedesc_pkgopt_loadlisting_bool
  {
    \lstnewenvironment{codesyntax*}[1][]
      {
        \bool_if:NTF \l__codedesc_codedescribe_activ_bool
          {
            \bool_if:NT \g__codedesc_syntax_bool
              {
                \msg_warning:nnn { codedesc / warnings } {syntax dup}
                      {syntax:02}
              }
          }
          {
            \msg_warning:nnnxx { codedesc / warnings } {out of scope}
                  {syntax:03}{codesyntax~ env}{codedescribe~ env}
          }

        \vcoffin_gset:Nnw \l__codedesc_syntax_coffin {\l__codedesc_syntax_wd_dim}
        \__codelist_set_options:n {#1,bckgndcolor=white,numbers=none}

    %%%%%%%%%%%%%%
    %%% keeping this consistent with
    %%% \lstnewenvironment{verbatimsc} in codelisting
    %%%%%%%%%%%%%%
        \__codelist_lstset:

        \skip_vertical:n {0.5ex}
      }
      {
        \skip_vertical:n {1ex}~\__codecmm_color_select:n {white} .  %% Yep, a single white dot
        \vcoffin_gset_end:

        \bool_gset_true:N \g__codedesc_syntax_bool
      }
  }
  {}


    %%%%%%%
    %%%  Variables used in the describelist/tsremark environments
    %%%%%%%

\coffin_new:N     \l__codedesc_tsremark_coffin

\bool_new:N       \l__codedesc_tsremark_peek_bool
\bool_new:N       \l__codedesc_describe_peek_bool

\tl_new:N         \l__codedesc_metafmt_describe_set_tl

\regex_const:Nn \c__codedesc_describe_regex { \c{describe} }
\regex_const:Nn \c__codedesc_remark_regex   { \c{begin} \cB{tsremark} }


\NewDocumentEnvironment{describelist}{O{20mm}m}
  {
    \skip_vertical:n{\l__codecmm_neg_skip}

    \__codecmm_set_textcolwidth:
    \dim_set:Nn \l__codedesc_describelabel_wd_dim {#1}
    \dim_set:Nn \l__codedesc_describelist_wd_dim {\l__codecmm_textcolwidth_dim}
    \cs_set_eq:NN \__codedesc_join:NnnNnnnn \coffin_attach:NnnNnnnn
    \tl_set:Nn \l__codedesc_ragged_tl {\raggedleft}

    \__codedesc_metafmt_get:nN {#2} \l__codedesc_metafmt_describe_set_tl

    \cs_set_eq:NN \describe \__codedesc_describe:nn
  }
  {
  }

\NewDocumentEnvironment{describelist*}{O{20mm}m}
  {
    \mode_if_horizontal:TF
      {\skip_vertical:n{\l__codecmm_neg_skip}}
      {\skip_vertical:n{\l__codecmm_null_skip}}

    \__codecmm_set_textcolwidth:
    \dim_set:Nn \l__codedesc_describelabel_wd_dim {#1}
    \dim_set:Nn \l__codedesc_describelist_wd_dim {\l__codecmm_textcolwidth_dim - \l__codedesc_describelabel_wd_dim -\marginparsep}
    \cs_set_eq:NN \__codedesc_join:NnnNnnnn \coffin_join:NnnNnnnn
    \tl_clear:N \l__codedesc_ragged_tl

    \__codedesc_metafmt_get:nN {#2} \l__codedesc_metafmt_describe_set_tl

    \cs_set_eq:NN \describe \__codedesc_describe:nn
  }
  {
  }


\cs_new_protected:Npn \__codedesc_describe:nn #1#2
  {
    \hcoffin_set:Nn \l__codedesc_tmpb_coffin
      {
        \l__codedesc_metafmt_describe_set_tl
        \__codedesc_index_if_set:n {#1}
        \__codedesc_metafmt: %V \l__codedesc_listkind_tl
        \l__codedesc_ragged_tl
        \__codedesc_typeset:n {#1}
      }
    \dim_compare:nNnTF {\coffin_wd:N \l__codedesc_tmpb_coffin} > {\l__codedesc_describelabel_wd_dim}
      {
        \vcoffin_set:Nnn \l__codedesc_tmpa_coffin
          { \l__codedesc_describelabel_wd_dim }
          {  ~\ ~ }
        \coffin_attach:NnnNnnnn
          \l__codedesc_tmpa_coffin {r}{t}
          \l__codedesc_tmpb_coffin {r}{t}
          {0pt}{0pt}
      }
      {
        \vcoffin_set:Nnn \l__codedesc_tmpa_coffin
          { \l__codedesc_describelabel_wd_dim }
          {
            \l__codedesc_metafmt_describe_set_tl
            \__codedesc_index_if_set:n {#1}
            \__codedesc_metafmt: %V \l__codedesc_listkind_tl
            \noindent\l__codedesc_ragged_tl \__codedesc_typeset:n {#1}
          }
      }

    \vcoffin_set:Nnn \l__codedesc_tmpb_coffin
      { \l__codedesc_describelist_wd_dim }
      { \noindent  #2 \skip_vertical:N \l__codecmm_coffinskip_dim }

    \__codedesc_join:NnnNnnnn
      \l__codedesc_tmpb_coffin {l}{T}
      \l__codedesc_tmpa_coffin {r}{B}
      {-\marginparsep}{0pt}

    \bool_if:NTF \l__codedesc_describe_peek_bool
      { \par }
      {
        \mode_if_horizontal:T { \unskip\par}
        \skip_vertical:N \l__codecmm_small_skip
      }

    \noindent
    \coffin_typeset:Nnnnn
      \l__codedesc_tmpb_coffin {l}{t} {0pt}{-1.5pt}

    \xpeekahead_cmd_peek:NTF
      \c__codedesc_describe_regex
      {
        \bool_set_true:N  \l__codedesc_describe_peek_bool
      }
      {
        \bool_set_false:N \l__codedesc_describe_peek_bool
        \par
        \skip_vertical:N \l__codecmm_mid_skip
      }
  }


\NewDocumentCommand \tsmeta {m}
  {
    \__codedesc_meta:n {#1}
  }
\cs_new_eq:NN \typesetmeta  \tsmeta


\NewDocumentCommand \tsargs {O{meta}m}
  {
    \__codedesc_args_typeset:nnnn {#1} {\l__codedesc_Lbracket_tl} {#2} {\l__codedesc_Rbracket_tl}
  }
\cs_new_eq:NN \typesetargs  \tsargs


\NewDocumentCommand \tsmacro {O{code}mO{}m}
  {
    \group_begin:
      \__codedesc_metafmt_set:n {#1}
      \__codedesc_list_typeset:nnn{#2}{,~}{,~}
      \,\__codedesc_args_typeset:nnnn {oarg} [ {#3} ]
      \__codedesc_args_typeset:nnnn {marg} \{ {#4} \}
    \group_end:
  }
\cs_new_eq:NN \typesetmacro \tsmacro


\regex_const:Nn \c__codedesc_cmdspc_regex {(\\[^\ ]+)\ ( [ \[ \{ \} \] ] )}

\NewDocumentCommand \tsverb {ssO{code}m}
  {
    \group_begin:
      \__codedesc_metafmt_set:n {#3}

      \l__codedesc_strut_tl
      \__codedesc_metafmt:

      \str_set:Nn \l__codedesc_tmpa_tl {#4}
      \bool_if:NTF #2
        {
          \str_remove_all:Nn \l__codedesc_tmpa_tl {~}
        }
        {
          \bool_if:NTF #1
            {
              \regex_replace_all:NnN \c__codedesc_cmdspc_regex {\1\2} \l__codedesc_tmpa_tl
            }
            {  }
        }
      \l__codedesc_tmpa_tl
    \group_end:
  }
\cs_new_eq:NN \typesetverb \tsverb

\NewDocumentCommand \tsfmt {O{code}m}
  {
    \group_begin:
      \__codedesc_metafmt_set:n {#1}
      \__codedesc_metafmt:
      #2
    \group_end:
  }
\cs_new_eq:NN \typesetfmt \tsfmt


\bool_if:NTF \l__codedesc_pkgopt_indexset_bool
  {
    \NewDocumentCommand \tsobj {O{code}m}
      {
        \group_begin:
          \__codedesc_metafmt_set:nn {list format}{#1}
          \__codedesc_list_typeset:nnn{#2} \l__codedesc_sep_tl \l__codedesc_lastsep_tl

          \bool_if:NTF \l__codedesc_index_bool
            {
              \seq_set_from_clist:Nn \l__codedesc_tmpa_seq {#2}
              \seq_map_inline:Nn \l__codedesc_tmpa_seq
                { \__codedesc_index:n {##1} }
            }
            {}
        \group_end:
      }
  }
  {
    \NewDocumentCommand \tsobj {O{code}m}
      {
        \group_begin:
          \__codedesc_metafmt_set:nn {list format}{#1}
          \__codedesc_list_typeset:nnn{#2} \l__codedesc_sep_tl \l__codedesc_lastsep_tl
        \group_end:
      }
  }
\cs_new_eq:NN \typesetobj \tsobj


\NewDocumentCommand \tsmarginnote {m}
  {
    \marginpar
      {
        { \__codedesc_note_fmt:\raggedleft #1 \par }
      }
  }
\cs_new_eq:NN \typesetmarginnote \tsmarginnote



% TODO: issue #18
% Test if already defined...maybe not...
%
\NewDocumentEnvironment {tsremark} {O{ \l__codedesc_label_remark_tl :}}
  {
    \xpeekahead_env_set:nNTF {tsremark}
      \c__codedesc_remark_regex
      {
        \bool_set_true:N  \l__codedesc_tsremark_peek_bool
      }
      {
        \bool_set_false:N \l__codedesc_tsremark_peek_bool
        \par
        \skip_vertical:N \l__codecmm_mid_skip
      }

    \__codecmm_set_textcolwidth:
    \group_begin:
      \vcoffin_gset:Nnw \l__codedesc_tsremark_coffin {0.8\l__codecmm_textcolwidth_dim}
        \setlength\parindent{0pt}\small
        \textsl{\textbf{#1}}
  }
  {
      \skip_vertical:N \l__codecmm_coffinskip_dim
      \vcoffin_gset_end:
      \bool_if:NTF \l__codedesc_tsremark_peek_bool
        {
          \par
        }
        {
          \mode_if_horizontal:T
            { \par }
          \skip_vertical:n{\l__codecmm_tiny_skip}
        }

      \noindent\hspace{0.2\l__codecmm_textcolwidth_dim}
      \coffin_typeset:Nnnnn
        \l__codedesc_tsremark_coffin
        {l}{T}  {0pt}{0pt}
    \group_end:
  }
\cs_new_eq:NN \typesetremark \tsremark
\cs_new_eq:NN \endtypesetremark \endtsremark

\NewDocumentEnvironment {tsremark*} {O{Note:}}
  {
    \msg_warning:nnnnn { codedesc / deprecated } {deprecated env} {remark*:01}{tsremark*}{tsremark}
    \begin{tsremark}[#1]
  }
  {
    \end{tsremark}
  }


%%%%%%%%
%%%
%%% Implementing active token 'short cut'
%%% To be sure it might be a command and not some random string
%%% no spaces or anything else allowed but:
%%%
%%% !:[    or !:{    ==> \tsobj
%%% !::[   or !::{   ==> \tsargs
%%% !![    or !!{    ==> \tsverb
%%% !!:{             ==> \tsmeta
%%% !!::{            ==> \tsmarginnote
%%% !!?[   or !!?{   ==> \tsmacro
%%%
%%%%%%%%

\bool_new:N \l__codedesc_exc_was_activ_bool
\bool_new:N \l__codedesc_tsOn_bool

\cs_new:Npn \__codedesc_peek_arg:Nn #1#2
  {
    \peek_charcode:NTF [
      { #1 }
      {
        \peek_catcode:NTF \c_group_begin_token
          { #1 }
          { \__codedesc_exc_hack: #2 }
      }
  }

\cs_new:Npn \__codedesc_exc_shortcut:
  {
    \peek_charcode_remove:NTF :
      {
        \peek_charcode_remove:NTF :
          {
            \__codedesc_peek_arg:Nn \tsargs { \__codedesc_collon_hack: \__codedesc_collon_hack: }
          }
          {
            \__codedesc_peek_arg:Nn \tsobj { \__codedesc_collon_hack: }
          }
      }
      {
        \peek_charcode_remove:NTF !
          {
            \peek_charcode_remove:NTF :
              {
                \peek_charcode_remove:NTF :
                  {
                    \peek_catcode:NTF \c_group_begin_token
                      { \tsmarginnote }
                      { \__codedesc_exc_hack: \__codedesc_exc_hack: \__codedesc_collon_hack: \__codedesc_collon_hack: }
                  }
                  {
                    \peek_catcode:NTF \c_group_begin_token
                      { \tsmeta }
                      { \__codedesc_exc_hack: \__codedesc_exc_hack: \__codedesc_collon_hack: }
                  }
              }
              {
                \peek_charcode_remove:NTF ?
                  {
                    \__codedesc_peek_arg:Nn \tsmacro { \__codedesc_exc_hack: \__codedesc_quest_hack: }
                  }
                  {
                    \__codedesc_peek_arg:Nn \tsverb { \__codedesc_exc_hack: }
                  }
              }
          }
          {
            \__codedesc_exc_hack:
          }
      }
  }

\cs_new_protected:Npn \__codedesc_exc_msg:n #1
  {
    \msg_warning:nnnnn { codedesc / shortcut } {pre defined}
      {active01}{!}{#1}
  }

\cs_new_protected:Npn \tsOn
  {
    \bool_if:NF \l__codedesc_tsOn_bool
      {
        \cs_set:Npn \__codedesc_exc_hack: {!}


        \int_compare:nNnTF { \char_value_catcode:n { `? } } = { 13 }
          {
           \exp_last_unbraced:NNNo \exp_last_unbraced:NNo \cs_set_eq:NN \__codedesc_quest_hack: { \char_generate:nn { `? } { 13 } }
          }
          {
            \cs_set:Npn \__codedesc_quest_hack: {?}
          }
        \int_compare:nNnTF { \char_value_catcode:n { `: } } = { 13 }
          {
            \exp_last_unbraced:NNNo \exp_last_unbraced:NNo \cs_set_eq:NN  \__codedesc_collon_hack: { \char_generate:nn { `: } { 13 } }
          }
          {
            \cs_set:Npn \__codedesc_collon_hack: {:}
          }

        \int_compare:nNnTF { \char_value_catcode:n { `! } } = { 13 }
          {
            \bool_set_true:N \l__codedesc_exc_was_activ_bool
          }
          {
            \bool_set_false:N \l__codedesc_exc_was_activ_bool  %% might not be needed
            \char_set_catcode_active:N !
          }

       \exp_last_unbraced:NNNo \exp_last_unbraced:NNo \cs_set_eq:NN \__codedesc_prev_exc: { \char_generate:nn { `! } { 13 } }

       \cs_if_eq:NNF \__codedesc_prev_exc: \__codedesc_exc_shortcut:
          { %% some other definition
            \cs_if_exist:NT \__codedesc_prev_exc:
              {
                \exp_args:No \__codedesc_exc_msg:n {\token_to_meaning:N \__codedesc_prev_exc:}
                \bool_if:NT \l__codedesc_exc_was_activ_bool
                  {
                    \cs_set_eq:NN \__codedesc_exc_hack: \__codedesc_prev_exc:
                  }
              }

          }

        \char_set_active_eq:NN ! \__codedesc_exc_shortcut:
        \bool_set_true:N \l__codedesc_tsOn_bool
      }
  }

\cs_new_protected:Npn \tsOff
  {
    \bool_if:NT \l__codedesc_tsOn_bool
      {
        %% getting out
        \cs_if_exist:NT \__codedesc_prev_exc:
          {
            %% restoring whatever definition was there
            \char_set_active_eq:NN ! \__codedesc_prev_exc:
          }
        \bool_if:NTF \l__codedesc_exc_was_activ_bool
          {
            %% leaving it active in this case
            \bool_set_false:N \l__codedesc_exc_was_activ_bool  %% might not be active next time
          }
          {
            %% back as other
            \char_set_catcode_other:N !
          }
        \bool_set_false:N \l__codedesc_tsOn_bool
      }
  }






%%%% ARGH !!!!

\keys_define:nn { codedesc / title }
  {
    title    .usage:n           = general ,
    title    .value_required:n  = true ,
  	title    .tl_set:N          = \l__codedesc_title_tl ,

    author   .usage:n           = general ,
    author   .value_required:n  = true ,
  	author   .tl_set:N          = \l__codedesc_author_tl ,

    date     .usage:n           = general ,
    date     .value_required:n  = true ,
  	date     .tl_set:N          = \l__codedesc_descdate_tl ,
  }


\cs_new_protected:Npn \__codedesc_make_title: {%
	\newpage
	\null
	\vskip 2em%
	\begin{center}%
		{\LARGE \l__codedesc_title_tl \par}%
		\vskip 1.5em%
		{\large
			\lineskip .5em%
			\begin{tabular}[t]{c}%
				\l__codedesc_author_tl
			\end{tabular}\par}%
		\vskip 1em%
		{\large \l__codedesc_descdate_tl}%
	\end{center}%
	\par
	\vskip 1.5em
}


\NewDocumentCommand \tsdate {}
  {
      \seq_item:NV \l__codedesc_label_months_seq \c_sys_month_int
      \use:n {~} \int_to_arabic:n {\c_sys_year_int}
  }
\cs_new_eq:NN \typesetdate \tsdate



%%%ARGH !!!!!
%%% 'adapted' from 'abstract.cls'
%%%
%%%

\makeatletter

\tl_new:N \g__codedesc_footnote_tl
\int_new:N \g__codedesc_footnote_int

\cs_new_protected:Npn \__codedesc_footnote:nn #1#2
  {
    \footnotemark[#1]
    \tl_gput_right:Nn \g__codedesc_footnote_tl {\footnotetext[#1]{#2}}
  }

\cs_new_protected:Npn \__codedesc_footnote:n #1
  {
    \int_gincr:N \g__codedesc_footnote_int
    \exp_args:NV \__codedesc_footnote:nn \g__codedesc_footnote_int {#1}
  }

\NewDocumentCommand{\__codedesc_footnote:w}{O{}m}
  {
    \tl_if_empty:nTF {#1}
      { \__codedesc_footnote:n  {#2} }
      { \__codedesc_footnote:nn {#1}{#2} }
  }

\NewDocumentCommand \tstitle {m}
  {
    \keys_set:nn {codedesc / title}{#1}
  	\group_begin:
          \cs_set_eq:NN \footnote \__codedesc_footnote:w
          \tl_gclear:N \g__codedesc_footnote_tl
          \int_gzero:N \g__codedesc_footnote_int
        	\def\thefootnote{\@fnsymbol\c@footnote}%
        	\def\@makefnmark{\rlap{\@textsuperscript{\normalfont\@thefnmark}}}%
        	\long\def\@makefntext##1{\parindent 1em\noindent
        		\hb@xt@1.8em{%
        			\hss\@textsuperscript{\normalfont\@thefnmark}}##1}%
    	\if@twocolumn
      	\ifnum \col@number=\@ne
        	\__codedesc_make_title:
    	  \else
        	\twocolumn[\__codedesc_make_title:]%
    	  \fi
    	\else
      	\newpage
      	\global\@topnum\z@   % Prevents figures from going at top of page.
      	\__codedesc_make_title:
    	\fi
    	\thispagestyle{plain}
      \g__codedesc_footnote_tl
  	\group_end:
  }
\cs_new_eq:NN \typesettitle \tstitle


\NewDocumentEnvironment{tsabstract}{}
  {
   	\if@twocolumn
     	\section*{\abstractname}%
   	\else
     	\small
     	\begin{center}%
     		{\bfseries \abstractname\vspace{-.5em}\vspace{\z@}}%
     	\end{center}%
     	\quotation
   	\fi
  }
  {
    \if@twocolumn\else\endquotation\fi
  }
\cs_new_eq:NN \typesetabstract \tsabstract
\cs_new_eq:NN \endtypesetabstract \endtsabstract

\makeatother