% --------------------------------------------------------------------------
%
% the CHEMMACROS package -- module: `xfrac'
%
% --------------------------------------------------------------------------
% Clemens Niederberger
% --------------------------------------------------------------------------
% https://github.org/cgnieder/chemmacros/
% contact@mychemistry.eu
% --------------------------------------------------------------------------
% If you have any ideas, questions, suggestions or bugs to report, please
% feel free to contact me.
% --------------------------------------------------------------------------
% Copyright 2011-2016 Clemens Niederberger
%
% This work may be distributed and/or modified under the
% conditions of the LaTeX Project Public License, either version 1.3
% of this license or (at your option) any later version.
% The latest version of this license is in
%   http://www.latex-project.org/lppl.txt
% and version 1.3 or later is part of all distributions of LaTeX
% version 2005/12/01 or later.
%
% This work has the LPPL maintenance status `maintained'.
%
% The Current Maintainer of this work is Clemens Niederberger.
% --------------------------------------------------------------------------
\ChemModule{xfrac}{2015/07/22 use xfrac package with chemmacros}

\RequirePackage{xfrac}

% --------------------------------------------------------------------------

% #1: type
% #2: numerator
% #3: denominator
\cs_new_protected:Npn \chemmacros_frac:nnn #1#2#3
  {
    \IfInstanceExistTF {xfrac} {chemmacros-frac-\f@family-#1}
      { \sfrac [chemmacros-frac-\f@family-#1] {#2} {#3} }
      { \sfrac [chemmacros-frac-default-#1]{#2} {#3} }
  }

\NewDocumentCommand \chemfrac {O{text}mm}
  { \chemmacros_frac:nnn {#1} {#2} {#3} }

% --------------------------------------------------------------------------

% default:
\DeclareInstance {xfrac} {chemmacros-frac-cmr-superscript} {text}
  {
    numerator-top-sep   = -.1ex ,
    slash-left-kern     = -.2em ,
    slash-right-kern    = -.2em ,
    slash-symbol-font   = cmr
  }

\DeclareInstance {xfrac} {chemmacros-frac-cmr-text} {text}
  {
    numerator-top-sep   = 0ex ,
    slash-left-kern     = -.2em ,
    slash-right-kern    = -.2em ,
    slash-symbol-font   = cmr
  }

% computer modern (same as default):
\DeclareInstance {xfrac} {chemmacros-frac-cmr-superscript} {text}
  {
    numerator-top-sep   = -.1ex ,
    slash-left-kern     = -.2em ,
    slash-right-kern    = -.2em ,
    slash-symbol-font   = cmr
  }

\DeclareInstance {xfrac} {chemmacros-frac-cmr-text} {text}
  {
    numerator-top-sep   = 0ex ,
    slash-left-kern     = -.2em ,
    slash-right-kern    = -.2em ,
    slash-symbol-font   = cmr
  }

% Linux Libertine T lining:
\DeclareInstance {xfrac} {chemmacros-frac-LinuxLibertineT-TLF-text} {text}
  {
    numerator-top-sep   = 0ex ,
    slash-left-kern     = 0em ,
    slash-right-kern    = .05em ,
    slash-symbol-font   = LinuxLibertineT-TLF
  }

\DeclareInstance {xfrac} {chemmacros-frac-LinuxLibertineT-TLF-superscript} {text}
  {
    scale-factor        = 1.2 ,
    denominator-bot-sep = -.1ex ,
    numerator-top-sep   = -.1ex ,
    slash-left-kern     = .1em ,
    slash-right-kern    = .1em ,
    slash-symbol-font   = LinuxLibertineT-TLF
  }

% Linux Libertine T oldstyle:
\DeclareInstance {xfrac} {chemmacros-frac-LinuxLibertineT-TOsF-text} {text}
  {
    denominator-bot-sep = .1ex ,
    numerator-top-sep   = -.2ex ,
    slash-left-kern     = 0em ,
    slash-right-kern    = 0em ,
    slash-symbol-font   = LinuxLibertineT-TOsF
  }

\DeclareInstance {xfrac} {chemmacros-frac-LinuxLibertineT-TOsF-superscript} {text}
  {
    scale-factor        = 1.2 ,
    denominator-bot-sep = -.1ex ,
    numerator-top-sep   = -.2ex ,
    slash-left-kern     = 0em ,
    slash-right-kern    = .1em ,
    slash-symbol-font   = LinuxLibertineT-TOsF
  }

% lmodern:
\DeclareInstance {xfrac} {chemmacros-frac-lmr-superscript} {text}
  {
    slash-left-kern     = -.2em ,
    slash-right-kern    = -.2em ,
    slash-symbol-font   = lmr
  }

\DeclareInstance {xfrac} {chemmacros-frac-lmr-text} {text}
  {
    slash-left-kern     = -.2em ,
    slash-right-kern    = -.2em ,
    slash-symbol-font   = lmr
  }

% --------------------------------------------------------------------------