% \iffalse meta-comment
%
% File: siunitx-emulation.dtx Copyright (C) 2016-2019,2021-2023 Joseph Wright
%
% It may be distributed and/or modified under the conditions of the
% LaTeX Project Public License (LPPL), either version 1.3c of this
% license or (at your option) any later version.  The latest version
% of this license is in the file
%
%    https://www.latex-project.org/lppl.txt
%
% This file is part of the "siunitx bundle" (The Work in LPPL)
% and all files in that bundle must be distributed together.
%
% The released version of this bundle is available from CTAN.
%
% -----------------------------------------------------------------------
%
% The development version of the bundle can be found at
%
%    https://github.com/josephwright/siunitx
%
% for those people who are interested.
%
% -----------------------------------------------------------------------
%
%<*driver>
\documentclass{l3doc}
% Additional commands needed in this source
\ProvideDocumentCommand\email{m}{\href{mailto:#1}{\nolinkurl{#1}}}
% The next line is needed so that \GetFileInfo will be able to pick up
% version data
\usepackage{siunitx}
\begin{document}
  \DocInput{\jobname.dtx}
\end{document}
%</driver>
% \fi
%
% \GetFileInfo{siunitx.sty}
%
% \title{^^A
%   \pkg{siunitx-emulation} -- Emulation^^A
%   \thanks{This file describes \fileversion,
%     last revised \filedate.}^^A
% }
%
% \author{^^A
%  Joseph Wright^^A
%  \thanks{^^A
%    E-mail:
%    \email{joseph.wright@morningstar2.co.uk}^^A
%   }^^A
% }
%
% \date{Released \filedate}
%
% \maketitle
%
% \begin{documentation}
%
% \end{documentation}
%
% \begin{implementation}
%
% \section{\pkg{siunitx-emulation} implementation}
%
% Identify the internal prefix (\LaTeX3 \pkg{DocStrip} convention). In contrast
% to other parts of the bundle, the functions here may need to redefine those
% from various submodules.
%    \begin{macrocode}
%<@@=siunitx>
%    \end{macrocode}
%
% Start the \pkg{DocStrip} guards.
%    \begin{macrocode}
%<*package>
%    \end{macrocode}
%
%    \begin{macrocode}
%<*options>
%    \end{macrocode}
%
% Some messages.
%    \begin{macrocode}
\msg_new:nnn { siunitx } { option-removed }
  { Option~"#1"~has~been~removed~in~this~release. }
%    \end{macrocode}
%
% \begin{macro}{\@@_option_deprecated:nn}
% \begin{macro}{\@@_option_deprecated:nnn, \@@_option_deprecated:nnV}
%   Abstract out a simple wrapper.
%    \begin{macrocode}
\cs_new_protected:Npn \@@_option_deprecated:nn #1#2
  {
    \@@_deprecated_info:nn {#1} {#2}
    \keys_set:nn { siunitx } {#2}
  }
\cs_new_protected:Npn \@@_option_deprecated:nnn #1#2#3
  {
    \str_if_eq:nnTF {#3} { true }
      { \@@_option_deprecated:nn {#1} {#2} }
      {
        \@@_deprecated_info:nn {#1} { #2 ~=~ #3 }
        \keys_set:nn { siunitx } { #2 = #3 }
       }
  }
\cs_generate_variant:Nn \@@_option_deprecated:nnn { nnV }
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% \begin{macro}{\@@_option_removed:n, \@@_option_removed:V}
%   Abstract out a simple wrapper.
%    \begin{macrocode}
\cs_new_protected:Npn \@@_option_removed:n #1
  {
    \msg_warning:nnx { siunitx } { option-removed }
      {#1}
  }
\cs_generate_variant:Nn \@@_option_removed:n { V }
%    \end{macrocode}
% \end{macro}
%
% \subsection{Load-time option}
%
%    \begin{macrocode}
\clist_map_inline:nn
  {
    abbreviations           ,
    binary-units            ,
    load-configurations     ,
    version-1-compatibility
  }
  {
    \keys_define:nn { siunitx } { #1 .code:n = \@@_option_removed:n {#1} }
  }
%    \end{macrocode}
%
% \subsection{Angle options}
%
%  All straight-forward emulation.
%    \begin{macrocode}
\keys_define:nn { siunitx }
  {
    add-arc-degree-zero .code:n =
      {
        \@@_option_deprecated:nnV
          { add-arc-degree-zero }
          { fill-angle-degrees }
          \l_keys_value_tl
      } ,
    add-arc-degree-zero .default:n = true ,
    add-arc-minute-zero .code:n =
      {
        \@@_option_deprecated:nnV
          { add-arc-minute-zero }
          { fill-angle-minutes }
          \l_keys_value_tl
      } ,
    add-arc-minute-zero .default:n = true ,
    add-arc-second-zero .code:n =
      {
        \@@_option_deprecated:nnV
          { add-arc-second-zero }
          { fill-angle-seconds }
          \l_keys_value_tl
      } ,
    add-arc-second-zero .default:n = true ,
    arc-separator .code:n =
      {
        \@@_option_deprecated:nnV
          { arc-separator }
          { angle-separator }
          \l_keys_value_tl
      }
  }
%    \end{macrocode}
%
% \subsection{Combination functions options}
%
%    \begin{macrocode}
\keys_define:nn { siunitx }
  {
    list-units / brackets .code:n =
      {
        \@@_option_deprecated:nn
          { list-units~=~brackets }
          { list-units~=~bracket }
      } ,
    range-units / brackets .code:n =
      {
        \@@_option_deprecated:nn
          { range-units~=~brackets }
          { range-units~=~bracket }
      } ,
    product-units / brackets .code:n =
      {
        \@@_option_deprecated:nn
          { product-units~=~brackets }
          { product-units~=~bracket }
      }
  }
%    \end{macrocode}
%
% \subsection{Command options}
%
%    \begin{macrocode}
\keys_define:nn { siunitx }
  {
    overwrite-functions .code:n =
      {
        \@@_option_deprecated:nnV
          { overwrite-functions }
          { overwrite-commands }
          \l_keys_value_tl
      } ,
    overwrite-functions .default:n = true
  }
%    \end{macrocode}
%
% \subsection{Print options}
%
%    \begin{macrocode}
\keys_define:nn { siunitx }
  {
    detect-all .code:n =
      {
        \@@_option_deprecated:nn
          { detect-all }
          {
            mode~=~match , ~
            propagate-math-font~=~true , ~
            reset-math-version~=~false , ~
            reset-text-family~=~false , ~
            reset-text-series~=~false , ~
            reset-text-shape~=~false , ~
            text-family-to-math~=~true , ~
            text-series-to-math~=~true
          }
      } ,
    detect-family .code:n =
      {
        \@@_option_deprecated:nn
          { detect-family }
          {
            reset-text-family~=~false , ~
            text-family-to-math~=~true
          }
      } ,
    detect-mode .code:n =
      {
        \@@_option_deprecated:nn
          { detect-mode }
          { mode~=~match }
      } ,
    detect-none .code:n =
      {
        \@@_option_deprecated:nn
          { detect-none }
          {
            mode~=~math , ~
            propagate-math-font~=~false , ~
            reset-math-version~=~true , ~
            reset-text-family~=~true , ~
            reset-text-series~=~true , ~
            text-family-to-math~=~false , ~
            text-series-to-math~=~false
          }
      } ,
    detect-shape .code:n =
      {
        \@@_option_deprecated:nn
          { detect-shape }
          { reset-text-shape~=~false }
      } ,
    detect-weight .code:n =
      {
        \@@_option_deprecated:nn
          { detect-weight }
          {
            reset-text-series~=~false , ~
            text-series-to-math~=~true
          }
      }
  }
\clist_map_inline:nn
  {
    detect-display-math  ,
    detect-inline-family ,
    detect-inline-weight
  }
  {
    \keys_define:nn { siunitx } { #1 .code:n = \@@_option_removed:n {#1} }
  }
%    \end{macrocode}
%
% The old font insertion options.
%    \begin{macrocode}
\clist_map_inline:nn
  {
    math-rm        ,
    math-sf        ,
    math-tt        ,
    number-math-rm ,
    number-math-sf ,
    number-math-tt ,
    number-text-rm ,
    number-text-sf ,
    number-text-tt ,
    text-rm        ,
    text-sf        ,
    text-tt        ,
    unit-math-rm   ,
    unit-math-sf   ,
    unit-math-tt   ,
    unit-text-rm   ,
    unit-text-sf   ,
    unit-text-tt
  }
  {
    \keys_define:nn { siunitx } { #1 .code:n = \@@_option_removed:n {#1} }
  }
%    \end{macrocode}
%
% \subsection{Symbol options}
%
%    \begin{macrocode}
\clist_map_inline:nn
  {
    math-angstrom  ,
    math-arcminute ,
    math-arcsecond ,
    math-celsius   ,
    math-degree    ,
    math-micro     ,
    math-ohm       ,
    text-angstrom  ,
    text-arcminute ,
    text-arcsecond ,
    text-celsius   ,
    text-degree    ,
    text-micro     ,
    text-ohm       ,
  }
  {
    \keys_define:nn { siunitx } { #1 .code:n = \@@_option_removed:n {#1} }
  }
%    \end{macrocode}
%
% \subsection{Number options}
%
%    \begin{macrocode}
\keys_define:nn { siunitx }
  {
    group-digits / false .code:n =
      {
        \@@_option_deprecated:nn
          { group-digits ~ = ~ false }
          { group-digits ~ = ~ none }
      } ,
    group-digits / true .code:n =
      {
        \@@_option_deprecated:nn
          { group-digits ~ = ~ true }
          { group-digits ~ = ~ all }
      } ,
    input-symbols .code:n =
      {
        \msg_info:nnnn { siunitx } { option-deprecated }
          { input-symbols } { input-digits }
        \tl_put_right:Nn \l_@@_number_input_digit_tl {#1}
      } ,
    separate-uncertainty .choice: ,
    separate-uncertainty / false .code:n =
      {
        \@@_option_deprecated:nn
          { separate-uncertainty }
          { uncertainty-mode~=~compact }
      } ,
    separate-uncertainty / true .code:n =
      {
        \@@_option_deprecated:nn
          { separate-uncertainty }
          { uncertainty-mode~=~separate }
      } ,
    separate-uncertainty .default:n = true
  }
%    \end{macrocode}
%
% A small number of removed options.
%    \begin{macrocode}
\clist_map_inline:nn
  {
    input-protect-tokens ,
    input-quotient       ,
    output-product       ,
    quotient-mode
  }
  {
    \keys_define:nn { siunitx } { #1 .code:n = \@@_option_removed:n {#1} }
  }
%    \end{macrocode}
%
% Options for number processing: largely removals.
%    \begin{macrocode}
\keys_define:nn { siunitx }
  {
    add-decimal-zero .choice: ,
    add-decimal-zero / false .code:n =
      {
        \@@_option_deprecated:nn
          { add-decimal-zero }
          { minimum-decimal-digits~=~0 }
      } ,
    add-decimal-zero / true .code:n =
      {
        \@@_option_deprecated:nn
          { add-decimal-zero }
          { minimum-decimal-digits~=~1 }
      } ,
    add-decimal-zero .default:n = true ,
    add-integer-zero .code:n =
      {
        \@@_option_deprecated:nn
          { add-integer-zero }
          { print-zero-integer }
      } ,
    close-bracket .code:n =
      { \@@_option_removed:V \l_keys_key_tl } ,
    bracket-numbers .choice: ,
    bracket-numbers / false .code:n =
      {
        \@@_option_deprecated:nn
          { bracket-numbers }
          { bracket-ambiguous-numbers~=~false }
      } ,
    bracket-numbers / true .code:n =
      {
        \@@_option_deprecated:nn
          { bracket-numbers }
          { bracket-ambiguous-numbers~=~true }
      } ,
    bracket-numbers .default:n = true ,
    explicit-sign .code:n =
      {
        \str_if_eq:nnTF {#1} { + }
          {
            \@@_option_deprecated:nn
              { explicit-sign }
              { print-implicit-plus~=~true  }
          }
          { \@@_option_removed:V \l_keys_key_tl }
      } ,
    group-four-digits .choice: ,
    group-four-digits / false .code:n =
      {
        \@@_option_deprecated:nn
          { group-four-digits~=~false }
          { group-minimum-digits~=~5 }
      } ,
    group-four-digits / true .code:n =
      {
        \@@_option_deprecated:nn
          { group-four-digits~=~false }
          { group-minimum-digits~=~4 }
      } ,
    bracket-numbers .default:n = true ,
    omit-uncertainty .code:n =
      {
        \@@_option_deprecated:nnV
          { omit-uncertainty }
          { drop-uncertainty }
          \l_keys_value_tl
      } ,
    omit-uncertainty .default:n = true ,
    open-bracket .code:n =
      { \@@_option_removed:V \l_keys_key_tl } ,
    retain-unity-mantissa .code:n =
      {
        \@@_option_deprecated:nnV
          { retain-unity-mantissa }
          { print-unity-mantissa }
          \l_keys_value_tl
      } ,
    retain-unity-mantissa .default:n = true ,
    retain-zero-exponent .code:n =
      {
        \@@_option_deprecated:nnV
          { retain-zero-exponent }
          { print-zero-exponent }
          \l_keys_value_tl
      } ,
    retain-zero-exponent .default:n = true ,
    round-integer-to-decimal .code:n =
      { \@@_option_removed:V \l_keys_key_tl } ,
    scientific-notation .choice: ,
    scientific-notation / engineering .code:n =
      {
        \@@_option_deprecated:nn
          { scientific-notation~=~engineering }
          { exponent-mode~=~engineering }
      } ,
    scientific-notation / fixed .code:n =
      {
        \@@_option_deprecated:nn
          { scientific-notation~=~fixed }
          { exponent-mode~=~fixed }
      } ,
    scientific-notation / false .code:n =
      {
        \@@_option_deprecated:nn
          { scientific-notation~=~false }
          { exponent-mode~=~input }
      } ,
    scientific-notation / true .code:n =
      {
        \@@_option_deprecated:nn
          { scientific-notation~=~true }
          { exponent-mode~=~scientific }
      } ,
    scientific-notation .default:n = true ,
    zero-decimal-to-integer .code:n =
      {
        \@@_option_deprecated:nnV
          { zero-decimal-to-integer }
          { drop-zero-decimal }
          \l_keys_value_tl
      } ,
    zero-decimal-to-integer .default:n = true
  }
%    \end{macrocode}
%
% \subsubsection{Table options}
%
%  All straight-forward emulation.
%    \begin{macrocode}
\keys_define:nn { siunitx }
  {
    table-align-text-post .code:n =
      {
        \@@_option_deprecated:nnV
          { table-align-text-post }
          { table-align-text-after }
          \l_keys_value_tl
      } ,
    table-align-text-post .default:n = true ,
    table-align-text-pre .code:n =
      {
        \@@_option_deprecated:nnV
          { table-align-text-pre }
          { table-align-text-before }
          \l_keys_value_tl
      } ,
    table-align-text-pre .default:n = true ,
    table-number-alignment / center-decimal-marker .code:n =
      {
        \msg_info:nnnn { siunitx } { option-deprecated }
          { table-number-alignment~=~center-decimal-marker }
          { table-alignment-mode~=~marker }
        \keys_set:nn
          { siunitx }
          { table-alignment-mode = marker }
      } ,
    table-omit-exponent .code:n =
      {
        \msg_info:nnnn { siunitx } { option-deprecated }
          { table-omit-exponent } { drop-exponent }
        \str_if_eq:VnTF \l_keys_value_tl { true }
          {
            \keys_set:nn
              { siunitx }
              { drop-exponent = true , exponent-mode = fixed }
          }
          {
            \keys_set:nn
              { siunitx }
              { drop-exponent = false }
          }
      } ,
    table-omit-exponent .default:n = true ,
    table-parse-only .code:n =
      {
        \msg_info:nnnn { siunitx } { option-deprecated }
          { table-parse-only }
          { table-alignment-mode~=~none }
        \str_if_eq:VnTF \l_keys_value_tl { false }
          {
            \keys_set:nn
              { siunitx }
              { table-alignment-mode = marker }
          }
          {
            \keys_set:nn
              { siunitx }
              { table-alignment-mode = none }
          }
      } ,
    table-space-text-post .code:n =
      {
        \msg_info:nnnn { siunitx } { option-deprecated }
          { table-space-text-post }
          { table-format }
        \tl_set:Nn \l_@@_table_after_model_tl {#1}
      } ,
    table-space-text-pre .code:n =
      {
        \msg_info:nnnn { siunitx } { option-deprecated }
          { table-space-text-post }
          { table-format }
        \tl_set:Nn \l_@@_table_before_model_tl {#1}
      }
  }
%    \end{macrocode}
%
% \begin{macro}{\@@_option_table_format:n}
% \begin{macro}
%   {
%     \@@_option_table_comparator:nnnnnnn           ,
%     \@@_option_table_figures-decimal:nnnnnnnn     ,
%     \@@_option_table_figures-exponent:nnnnnnnn    ,
%     \@@_option_table_figures-integer:nnnnnnnn     ,
%     \@@_option_table_figures-uncertainty:nnnnnnnn ,
%     \@@_option_table_sign-exponent:nnnnnnnn       ,
%     \@@_option_table_sign-mantissa:nnnnnnnn
%   }
%    \begin{macrocode}
\cs_new_protected:Npn \@@_option_table_format:n #1
  {
    \msg_info:nnnn { siunitx } { option-deprecated }
      { table- #1 }
      { table-format }
    \tl_set:Nx \l_@@_table_format_tl
      {
        \cs:w @@_option_table_ #1 :nnnnnnnn
          \exp_after:wN \exp_after:wN \exp_after:wN \cs_end:
          \exp_after:wN \l_@@_table_format_tl
          \exp_after:wN { \l_keys_value_tl }
      }
    \exp_after:wN \@@_table_generate_model:nnnnnnn
      \l_@@_table_format_tl
  }
\cs_new:Npn \@@_option_table_comparator:nnnnnnnn #1#2#3#4#5#6#7#8
  { \exp_not:n { {#8} {#2} {#3} {#4} {#5} {#6} {#7} } }
\cs_new:cpn { @@_option_table_figures-decimal:nnnnnnnn }
  #1#2#3#4#5#6#7#8
  { \exp_not:n { {#1} {#2} {#3} {#8} {#5} {#6} {#7} } }
\cs_new:cpn { @@_option_table_figures-exponent:nnnnnnnn }
  #1#2#3#4#5#6#7#8
  { \exp_not:n { {#1} {#2} {#3} {#4} {#5} {#6} {#8} } }
\cs_new:cpn { @@_option_table_figures-integer:nnnnnnnn }
  #1#2#3#4#5#6#7#8
  { \exp_not:n { {#1} {#2} {#8} {#4} {#5} {#6} {#7} } }
\cs_new:cpn { @@_option_table_figures-uncertainty:nnnnnnnn }
  #1#2#3#4#5#6#7#8
  { \exp_not:n { {#1} {#2} {#3} {#4} { { S } {#8} } {#6} {#7} } }
\cs_new:cpn { @@_option_table_sign-exponent:nnnnnnnn }
  #1#2#3#4#5#6#7#8
  { \exp_not:n { {#1} {#2} {#3} {#4} {#5} {#8} {#7} } }
\cs_new:cpn { @@_option_table_sign-mantissa:nnnnnnnn }
  #1#2#3#4#5#6#7#8
  { \exp_not:n { {#1} {#8} {#3} {#4} {#5} {#6} {#7} } }
%    \end{macrocode}
% \end{macro}
% \end{macro}
%
% Options which all use the same emulation set up.
%    \begin{macrocode}
\keys_define:nn { siunitx }
  {
    table-comparator .code:n =
      { \@@_option_table_format:n { comparator } } ,
    table-figures-decimal .code:n =
      { \@@_option_table_format:n { figures-decimal } } ,
    table-figures-exponent .code:n =
      { \@@_option_table_format:n { figures-exponent } } ,
    table-figures-integer .code:n =
      { \@@_option_table_format:n { figures-integer } } ,
    table-figures-uncertainty .code:n =
      { \@@_option_table_format:n { figures-uncertainty } } ,
    table-sign-exponent .code:n =
      { \@@_option_table_format:n { sign-exponent } } ,
    table-sign-mantissa .code:n =
      { \@@_option_table_format:n { sign-mantissa } }
  }
%    \end{macrocode}
%
% \subsection{Unit options}
%
%    \begin{macrocode}
\keys_define:nn { siunitx }
  {
    fraction-function .code:n =
      {
        \@@_option_deprecated:nnV
          { fraction-function }
          { fraction-command }
          \l_keys_value_tl
      } ,
    literal-superscript-as-power .code:n =
      { \@@_option_removed:V \l_keys_key_tl } ,
    power-font .code:n =
      { \@@_option_removed:V \l_keys_key_tl } ,
    qualifier-mode / brackets .code:n =
      {
        \@@_option_deprecated:nn
          { qualifier-mode~=~brackets }
          { qualifier-mode~=~bracket }
      } ,
    qualifier-mode / space .code:n =
      {
        \msg_info:nnnn { siunitx } { option-deprecated }
          { qualifier-mode~=~space }
          { qualifier-mode~=~phrase"~plus~"qualifier-phrase=\  }
        \keys_set:nn
          { siunitx }
          { qualifier-mode = phrase, qualifier-phrase = \  }
      } ,
    qualifier-mode / text .code:n =
      {
        \@@_option_deprecated:nn
          { qualifier-mode~=~text }
          { qualifier-mode~=~combine }
      }
  }
%    \end{macrocode}
%
% The deprecated settings for |per-mode| have to be handled manually as
% |per-mode| is no longer a choice.
%    \begin{macrocode}
\keys_define:nn { siunitx }
  {
    display-per-mode / reciprocal .code:n =
      {
        \@@_option_deprecated:nn
          { per-mode~=~reciprocal }
          { per-mode~=~power }
      } ,
    inline-per-mode / reciprocal .code:n =
      {
        \@@_option_deprecated:nn
          { per-mode~=~reciprocal }
          { per-mode~=~power }
      } ,
    display-per-mode / reciprocal-positive-first .code:n =
      {
        \@@_option_deprecated:nn
          { per-mode~=~reciprocal-positive-first }
          { per-mode~=~power-positive-first }
      } ,
    inline-per-mode / reciprocal-positive-first .code:n =
      {
        \@@_option_deprecated:nn
          { per-mode~=~reciprocal-positive-first }
          { per-mode~=~power-positive-first }
      }
  }
%    \end{macrocode}
%
% \subsection{Quantity units}
%
%    \begin{macrocode}
\keys_define:nn { siunitx }
  {
    allow-number-unit-breaks .code:n =
      {
        \@@_option_deprecated:nnV
          { allow-number-unit-breaks  }
          { allow-quantity-breaks }
          \l_keys_value_tl
      } ,
    allow-number-unit-breaks .default:n = true ,
    exponent-to-prefix .choice: ,
    exponent-to-prefix / false .code:n =
      {
        \@@_option_deprecated:nn
          { exponent-to-prefix~=~false }
          { prefix-mode~=~input }
      } ,
    exponent-to-prefix / true .code:n =
      {
        \@@_option_deprecated:nn
          { exponent-to-prefix~=~true }
          { prefix-mode~=~combine-exponent }
      } ,
    exponent-to-prefix .default:n = true ,
    multi-part-units .choice: ,
    multi-part-units / brackets . code:n =
      {
        \@@_option_deprecated:nn
          { multi-part-units~=~brackets }
          { separate-uncertainty-units~=~bracket }
      } ,
    multi-part-units / repeat . code:n =
      {
        \@@_option_deprecated:nn
          { multi-part-units~=~repeat }
          { separate-uncertainty-units~=~repeat }
      } ,
    multi-part-units / single . code:n =
      {
        \@@_option_deprecated:nn
          { multi-part-units~=~single }
          { separate-uncertainty-units~=~single }
      } ,
    number-unit-product .code:n =
      {
        \@@_option_deprecated:nnV
          { number-unit-product }
          { quantity-product }
          \l_keys_value_tl
      } ,
    number-unit-separator .code:n =
      {
        \@@_option_deprecated:nnV
          { number-unit-separator }
          { quantity-product }
          \l_keys_value_tl
      } ,
    prefixes-as-symbols .choice: ,
    prefixes-as-symbols / false . code:n =
      {
        \@@_option_deprecated:nn
          { prefixes-as-symbols~=~false }
          { prefix-mode~=~extract-exponent }
      } ,
    prefixes-as-symbols / true . code:n =
      {
        \@@_option_deprecated:nn
          { prefixes-as-symbols~=~true }
          { prefix-mode~=~input }
      } ,
    prefixes-as-symbols .default:n = true
  }
%    \end{macrocode}
%
%    \begin{macrocode}
%</options>
%    \end{macrocode}
%
% \subsection{Preamble commands}
%
%    \begin{macrocode}
%<*interfaces>
%    \end{macrocode}
%
% \begin{macro}{\DeclareBinaryPrefix}
%   We simply drop |#3|.
%    \begin{macrocode}
\NewDocumentCommand \DeclareBinaryPrefix { +m m m }
  {
    \siunitx_declare_prefix:Nn #1 {#2}
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\DeclareSIPrePower, \DeclareSIPostPower}
%   Simply use a throw-away command for the part we do not need: this can
%   be followed by some clean-up.
%    \begin{macrocode}
\NewDocumentCommand \DeclareSIPrePower { +m m }
  {
    \siunitx_declare_power:NNn #1 \@@_tmp:w {#2}
    \seq_remove_all:Nn \l_siunitx_unit_symbolic_seq { \@@_tmp:w }
  }
\NewDocumentCommand \DeclareSIPostPower { +m m }
  {
    \siunitx_declare_power:NNn \@@_tmp:w #1 {#2}
    \seq_remove_all:Nn \l_siunitx_unit_symbolic_seq { \@@_tmp:w }
  }
%    \end{macrocode}
% \end{macro}
%
% \subsection{Document commands}
%
% \begin{macro}{\si}
%   A straight copy of \cs{unit}.
%    \begin{macrocode}
\NewDocumentCommand \si { O { } > { \TrimSpaces } m }
  {
    \mode_leave_vertical:
    \group_begin:
      \siunitx_unit_options_apply:n {#2}
      \keys_set:nn { siunitx } {#1}
      \siunitx_unit_format:nN {#2} \l_@@_tmp_tl
      \siunitx_print_unit:V \l_@@_tmp_tl
    \group_end:
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\SI}
%   Almost the same as \cs{qty}, but with the addition pre-unit.
%    \begin{macrocode}
\NewDocumentCommand \SI { O { } m o > { \TrimSpaces } m }
  {
    \mode_leave_vertical:
    \group_begin:
      \siunitx_unit_options_apply:n {#4}
      \keys_set:nn { siunitx } {#1}
      \IfNoValueF {#3}
        {
          \siunitx_unit_format:nN {#3} \l_@@_tmp_tl
          \siunitx_print_unit:V \l_@@_tmp_tl
          \nobreak
        }
      \siunitx_quantity:nn {#2} {#4}
    \group_end:
  }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}{\SIlist, \SIrange}
%   Straight copies.
%    \begin{macrocode}
\NewDocumentCommand \SIlist
  { O { } > { \SplitList { ; } } m > { \TrimSpaces } m }
  {
    \mode_leave_vertical:
    \group_begin:
      \siunitx_unit_options_apply:n {#3}
      \keys_set:nn { siunitx } {#1}
      \siunitx_quantity_list:nn {#2} {#3}
    \group_end:
  }
\NewDocumentCommand \SIrange { O { } m m > { \TrimSpaces } m }
  {
    \mode_leave_vertical:
    \group_begin:
      \siunitx_unit_options_apply:n {#4}
      \keys_set:nn { siunitx } {#1}
      \siunitx_quantity_range:nnn {#2} {#3} {#4}
    \group_end:
  }
%    \end{macrocode}
% \end{macro}
%
% \subsection{Symbol commands}
%
%    \begin{macrocode}
%<@@=siunitx_emulation>
%    \end{macrocode}
%
% \begin{macro}{\@@_non_latin:n}
%   A shortcut.
%    \begin{macrocode}
\cs_new:Npn \@@_non_latin:n #1
  { \codepoint_generate:nn {#1} { \char_value_catcode:n {#1} } }
%    \end{macrocode}
% \end{macro}
%
% \begin{macro}
%   {
%     \SIUnitSymbolAngstrom  ,
%     \SIUnitSymbolArcminute ,
%     \SIUnitSymbolArcsecond ,
%     \SIUnitSymbolCelsius   ,
%     \SIUnitSymbolDegree    ,
%     \SIUnitSymbolMicro     ,
%     \SIUnitSymbolOhm
%   }
%     The same setup as elsewhere but localised to the emulation module
%    \begin{macrocode}
\AtBeginDocument
  {
    \cs_new_protected:Npn \SIUnitSymbolArcminute
       { \ensuremath { { } ' } }
    \cs_new_protected:Npn \SIUnitSymbolArcsecond
       { \ensuremath { { } '' } }
    \@ifpackageloaded { fontspec }
      {
        \cs_new_protected:Npx \SIUnitSymbolAngstrom
           { \@@_non_latin:n { "00C5 } }
        \cs_new_protected:Npx \SIUnitSymbolDegree
           { \@@_non_latin:n { "00B0 } }
        \cs_new_protected:Npx \SIUnitSymbolCelsius
           { \@@_non_latin:n { "00B0 } C }
      }
      {
        \cs_new_protected:Npx \SIUnitSymbolAngstrom
          {
            \siunitx_print_text:n
              { \@@_non_latin:n { "00C5 } }
          }
        \cs_new_protected:Npx \SIUnitSymbolCelsius
          {
            \siunitx_print_text:n
              { \@@_non_latin:n { "00B0 } } C
          }
        \cs_new_protected:Npx \SIUnitSymbolDegree
          {
            \siunitx_print_text:n
              { \@@_non_latin:n { "00B0 } }
          }
      }
    \cs_new_protected:Npx \SIUnitSymbolMicro
       {
          \siunitx_print_text:n
            {
              \bool_lazy_or:nnTF
                { \sys_if_engine_luatex_p: }
                { \sys_if_engine_xetex_p: }
                { \@@_non_latin:n { "00B5 } }
                { \exp_not:N \textmu }
            }
       }
    \cs_new_protected:Npx \SIUnitSymbolOhm
       {
          \exp_not:N \ifmmode
            \cs_if_exist:NTF \upOmega
              { \exp_not:N \upOmega }
              { \exp_not:N \Omega }
          \exp_not:N \else
            \siunitx_print_text:n
              {
                \bool_lazy_or:nnTF
                  { \sys_if_engine_luatex_p: }
                  { \sys_if_engine_xetex_p: }
                  { \@@_non_latin:n { "03A9 } }
                  { \exp_not:N \textohm }
              }
          \exp_not:N \fi
       }
  }
%    \end{macrocode}
% \end{macro}
%
% \subsection{Unit commands}
%
% \begin{macro}{\celsius}
%   Deprecated but should work.
%    \begin{macrocode}
\siunitx_declare_unit:Nn \celsius { \degreeCelsius }
%    \end{macrocode}
% \end{macro}
%
% Units that have been removed: to avoid issues, we mark them as deprecated.
%    \begin{macrocode}
\msg_new:nnn { siunitx } { unit-deprecated }
  {
    Unit~macro~#1~has~been~deprecated~in~this~release. \\ \\
    The~BIPM~have~removed~this~unit~from~the~SI~Brochure.~
    You~should~define~it~yourself~using~\token_to_str:N \DeclareSIUnit\ %
    in~your~source.~The~current~definition~is\\ \\
    \token_to_str:N \DeclareSIUnit #1 \{ #2 \}
  }
\cs_gset_protected:Npn \@@_tmp:w #1#2
  {
    \quark_if_recursion_tail_stop:N #1
    \bool_new:c { g_@@_unit_warning_ \token_to_str:N #1 _bool }
    \siunitx_declare_unit:Nx #1
      {
        \exp_not:N \bool_if:NF
          \exp_not:c { g_@@_unit_warning_ \token_to_str:N #1 _bool  }
          {
            \exp_not:N \bool_gset_true:N 
              \exp_not:c { g_@@_unit_warning_ \token_to_str:N #1 _bool  }
            \msg_warning:nnnn { siunitx } { unit-deprecated }
              { \token_to_str:N #1 } {#2}
          }
        #2
      }
    \@@_tmp:w
  }
\@@_tmp:w
  \atomicmassunit   { u }
  \bar              { bar }
  \barn             { b }
  \bohr
    {
      \exp_not:N \text
        { \exp_not:N \ensuremath { a } } \char_generate:nn { `\_ } { 8 } { 0 }
    }
  \clight
    {
      \exp_not:N \text
        { \exp_not:N \ensuremath { c } } \char_generate:nn { `\_ } { 8 } { 0 }
    }
  \electronmass
    {
      \exp_not:N \text { \exp_not:N \ensuremath { m } }
      \char_generate:nn { `\_ } { 8 } { \exp_not:N \mathrm { e } }
    }
  \elementarycharge { \text { \ensuremath { e } } }
  \hartree
    {
      \exp_not:N \text { \exp_not:N \ensuremath { E } }
      \char_generate:nn { `\_ } { 8 } { \exp_not:N \mathrm { h } }
    }
  \knot             { kn }
  \mmHg             { mmHg }
  \nauticalmile     { M }
  \planckbar
    { \exp_not:N \text { \exp_not:N \ensuremath { \exp_not:N \hbar } } }
  \q_recursion_tail { }
  \q_recursion_stop
\@ifpackageloaded { fontspec }
  {
    \@@_tmp:w \angstrom { \@@_non_latin:n { "00C5 } }
  }
  {
    \@@_tmp:w \angstrom
      { \exp_not:N \text { \@@_non_latin:n { "00C5 } } }
  }
  \q_recursion_tail { }
  \q_recursion_stop
%    \end{macrocode}
%
% \subsection{Communication with \pkg{pgf}}
%
%    \begin{macrocode}
%<@@=siunitx_number>
%    \end{macrocode}
%
% \begin{macro}{\SendSettingsToPgf}
%    \begin{macrocode}
\NewDocumentCommand \SendSettingsToPgf { }
  {
    \use:x
      {
        \exp_not:N \pgfqkeys { /pgf/number~format }
          {
            \str_if_eq:VnT \l_@@_round_mode_tl { figures }
              {
                fixed ,
                fixed~zerofill = true ,
              }
            precision = \int_use:N \l_@@_round_precision_int ,
            set~decimal~separator =
              \str_if_eq:VnTF \l_siunitx_number_output_decimal_tl { , }
                { \exp_not:N \mathord }
                { \use:n }
                  { \exp_not:V \l_siunitx_number_output_decimal_tl } ,
            set~thousands~separator =
            set~decimal~separator =
              \str_if_eq:VnTF \l_@@_group_separator_tl { , }
                { \exp_not:N \mathord }
                { \use:n }
                  { \exp_not:V \l_@@_group_separator_tl } ,
            min~exponent~for~1000~sep =
              \int_eval:n { \l_@@_group_minimum_int - 1 } ,
            \bool_lazy_or:nnF
              { \l_@@_group_decimal_bool }
              { \l_@@_group_integer_bool }
              { min~exponent~for~1000~sep = 999 , }
            showpos = 
              \bool_if:NTF \l_@@_implicit_plus_bool
                { true }
                { false }
          }
      }
  }
%    \end{macrocode}
% \end{macro}
%
%    \begin{macrocode}
%</interfaces>
%    \end{macrocode}
%
%    \begin{macrocode}
%</package>
%    \end{macrocode}
%
% \end{implementation}
%
% \PrintIndex
