%%
%% This is file `bpchem.sty',
%% generated with the docstrip utility.
%%
%% The original source files were:
%%
%% bpchem.dtx  (with options: `bpchem')
%% 
%% IMPORTANT NOTICE:
%% 
%% For the copyright see the source file.
%% 
%% Any modified versions of this file must be renamed
%% with new filenames distinct from bpchem.sty.
%% 
%% For distribution of the original source see the terms
%% for copying and modification in the file bpchem.dtx.
%% 
%% This generated file may be distributed as long as the
%% original source files, as listed above, are part of the
%% same distribution. (The sources need not necessarily be
%% in the same archive or directory.)
%% File: bpchem.dtx Copyright (C) 2001-2017
%%                 Bjoern Pedersen <Bjoern.Pedersen@ch.tum.de>
%% This file may be distributed and used freely under
%% the LaTeX Project Public License
%%
%%
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{bpchem}[2004/08/21 v1.1 Chemical input helper]
\RequirePackage{xspace}
 %\IUPAC{Tetra\|cyclo[2.2.2.1\^{1,4}]\-

\newif\ifusecbgreek%
\usecbgreekfalse%
\DeclareOption{cbgreek}{\PackageInfo{bpchem}{cbgreek selected}\usecbgreektrue}
\ProcessOptions\relax
%% Define a  textsubscript corresponing to textsuperscript.
%% This is now also available as the package textsubscript by
%% D.Arsenau or as part of KOMA-Script2 by M. Kohm.
%%
%%
\providecommand*\textsubscript[1]{%
  \@textsubscript{\selectfont#1}}
\def\@textsubscript#1{%
  {\m@th\ensuremath{_{\mbox{\fontsize\sf@size\z@#1}}}}}
%% a register to save the length to backspace
%% two registers needed to get back to correct
%% working position if one is longer than the other.
\newlength{\BPClensub}
\newlength{\BPClensuper}
\newlength{\BPCdelta}
%% we are in subscript and maybe  the superscript was longer
\DeclareRobustCommand{\BPCadjustsub}{%
  \setlength\BPCdelta{\BPClensuper}\addtolength\BPCdelta{-\BPClensub}%
  \ifdim\BPCdelta>0pt{\kern\BPCdelta}\else\relax\fi%
  \setlength{\BPClensub}{0pt}% reset
  \setlength{\BPClensuper}{0pt}% reset
}%
%% we are in superscript and maybe  the subscript was longer
\DeclareRobustCommand{\BPCadjustsuper}{%
  \setlength\BPCdelta{\BPClensub}\addtolength\BPCdelta{-\BPClensuper}%
  \ifdim\BPCdelta>0pt{\kern\BPCdelta}\else\relax\fi%
  \setlength{\BPClensub}{0pt}% reset
  \setlength{\BPClensuper}{0pt}% reset
}%
%% make a subscript and remember length in BPClen
\DeclareRobustCommand{\BPCsub}[1]{%
  \ifmmode_{#1}\settowidth\BPClensub{_{#1}}%
  \else\textsubscript{#1}\settowidth\BPClensub{\textsubscript{#1}}\fi%
  \futurelet\next\lookforsuper%
}%
%% make a superscript and remember length in BPClen
%% raise by 0.15 em, else e.g. + collides with subscript
\DeclareRobustCommand{\BPCsuper}[1]{%
  \ifmmode^{#1}\settowidth\BPClensuper{^{#1}}%
  \else\raisebox{0.15em}{\textsuperscript{#1}}%
  \settowidth\BPClensuper{\textsuperscript{#1}}\fi%
  \futurelet\next\lookforsub%
}%
%% see if next token is BPCsuper,
\DeclareRobustCommand\lookforsuper{%
  \ifx\next\BPCsuper\let\next=\BPCsuperbs%
  \else\let\next=\BPCadjustsub\fi\next%
}%
%% see if next token is BPCsub
\DeclareRobustCommand\lookforsub{%
  \ifx\next\BPCsub\let\next=\BPCsubbs%
  \else\let\next=\BPCadjustsuper\fi\next%
}%
%%  backspace BPClen and make superscript
%%  eats the old \verb|\^|
\DeclareRobustCommand{\BPCsuperbs}[1]{\kern-\BPClensub\BPCsuper}%
%% backspace and make subscript
%% eats the old \_
\DeclareRobustCommand{\BPCsubbs}[1]{\kern-\BPClensuper\BPCsub}%
%% needed to get catcodes right
\DeclareRobustCommand{\DoBPChem}{}%
\def\DoBPChem#1{%
  #1\endgroup%
}%
\DeclareRobustCommand{\BPCSetupCat}{}
\def\BPCSetupCat{%
  %\catcode`^=\active%
  %\catcode`\_=\active%
  \BPCSetup%
}%
\DeclareRobustCommand{\BPCSetup}{}
\def\BPCSetup{%
 \let\_=\BPCsub%
 \let\^=\BPCsuper%
}%end BPCSetup
%% setup for chemical formula
\DeclareRobustCommand\BPChem{%
  \begingroup% endgroup in DoBPChem
  \BPCSetupCat%
  \DoBPChem%
}
%% these are taken from german.sty and allow more than one break
%% or breaks and hyphens in a word. Very useful for chemical names,
%% as they tend to grow rather long. Two short versions are also defined
\DeclareRobustCommand{\allowhyphens}{\penalty\@M \hskip\z@skip}
\DeclareRobustCommand{\BreakHyph}{\penalty\@M -\allowhyphens}
\DeclareRobustCommand{\MultiBreak}%
  {\penalty\@M\discretionary{-}{}{\kern.03em}%
   \allowhyphens}
\let\MB=\MultiBreak \let\BH=\BreakHyph
\DeclareRobustCommand{\DoIUPAC}[1]{%
  #1\endgroup}
\def\Prep{%
  \let\-=\BreakHyph%
  \let\|=\MultiBreak%
  \DoIUPAC%
}
\DeclareRobustCommand*{\IUPAC}{%
  \begingroup\BPCSetup\ignorespaces%
  \Prep}%
\expandafter\DeclareRobustCommand\expandafter\|\expandafter{\|}
%% Trick by David Kastrup <David.Kastrup@t-online.de> to make
%% non-fragile. Otherwise \verb+\|+ would become \verb+\delimiter"026B30D+ in
%% e.g. the toc
%% Recent \LaTeX{} releases (starting with <2017-04-15>) define \cs{-} robust.
%% This resulted in a infinite loop with older version of bpchem. We could use
%% \cs{IncludeInRelease}, but it might be easier to just use the definition
%% from the latest \LaTeX{} releases.
\DeclareRobustCommand{\-}{%
  \discretionary{%
    \char \ifnum\hyphenchar\font<\z@%
            \defaulthyphenchar%
          \else%
            \hyphenchar\font%
          \fi%
  }{}{}%
}%    \end{macrocode}
%% counters for numbering of chemical substances
\newcounter{BPCno}
\renewcommand{\theBPCno}{\textbf{\arabic{BPCno}}}
\newcounter{BPCnoa}[BPCno]
\renewcommand{\theBPCnoa}{\textbf{\arabic{BPCno}\alph{BPCnoa}}}
%% helper functions to mark first definition
\newcommand{\newchems@b}[2]{
\expandafter\gdef\csname cna@#1#2\endcsname{#2}%
}
%% reference a CNlabel (useful for section titles, captions etc.)
\DeclareRobustCommand*{\CNref}[1]{%
  \ref{cn:#1}%
}
%% reference a CNlabel/sublabel
\DeclareRobustCommand*{\CNrefsub}[2]{%
  \ref{cn:#1#2}
%%\textbf{\csname cna@#1#2\endcsname}%
}
%% label a substance and insert the number
\DeclareRobustCommand*{\CNlabel}[1]{%
  \CNlabelnoref{#1}%
  \CNref{#1}%
}
\DeclareRobustCommand*{\CNlabelnoref}[1]{%
  \expandafter\ifx\csname cnd@#1\endcsname\relax%
  {\refstepcounter{BPCno}\label{cn:#1}}%
  \expandafter\gdef\csname cnd@#1\endcsname{x}%
  \fi%
}
\DeclareRobustCommand*{\CNlabelsub}[2]{%
  \CNlabelsubnoref{#1}{#2}%
  \CNrefsub{#1}{#2}%
}
\DeclareRobustCommand*{\CNlabelsubnoref}[2]{%
  \CNlabelnoref{#1}%
  \expandafter\ifx\csname cna@#1#2\endcsname\relax%
  {\refstepcounter{BPCnoa}\label{cn:#1#2}}%
  \expandafter\gdef\csname cna@#1#2\endcsname{x}%
%% \newchems@b{#1}{#2}%
%%   \write\@auxout{\string\newchems@b{#1}{#2}}%
  \fi%
}
%% more helper mcors
\DeclareRobustCommand{\HNMR}{\IUPAC{\^{1}H-NMR}: $\delta$\xspace}
\DeclareRobustCommand{\CNMR}{\IUPAC{\^{13}C-NMR}: $\delta$\xspace}
\DeclareRobustCommand{\cis}{\textit{cis}\xspace}
\DeclareRobustCommand{\trans}{\textit{trans}\xspace}
%%%%%%%%%%%%%%%%%%%%%
\ifusecbgreek% code with roman greek
  \PackageInfo{bpchem}{using upright greek fonts from cbgreek}
  \input{lgrenc.def}
  \DeclareRobustCommand{\rm@greekletter}[1]{{\fontencoding{LGR}\selectfont%
    \def\encodingdefault{LGR}#1}}%
  \DeclareRobustCommand{\bpalpha}{\rm@greekletter{a}}
  \DeclareRobustCommand{\bpbeta}{\rm@greekletter{b}}
  \DeclareRobustCommand{\bpDelta}{\rm@greekletter{D}}
  \DeclareRobustCommand{\hapto}[1]{\rm@greekletter{h}\^{#1}}
\else
  \PackageInfo{bpchem}{using default math greek fonts}
  \DeclareRobustCommand{\bpalpha}{\ensuremath{\alpha}\xspace}
  \DeclareRobustCommand{\bpbeta}{\ensuremath{\beta}\xspace}
  \DeclareRobustCommand{\bpDelta}{\ensuremath{\Delta}\xspace}
  \DeclareRobustCommand{\hapto}[1]{\ensuremath{\eta^{#1}}}
\fi%
\let\talpha\bpalpha
\let\tbeta\bpbeta
%%%%%%
\DeclareRobustCommand*{\dreh}[1]%
  {$\lbrack \alpha \rbrack _{\mathrm D}^{#1}$}
\endinput
%%
%% End of file `bpchem.sty'.