4 files changed, 91 insertions, 61 deletions
diff --git a/Master/texmf-dist/doc/latex/mhchem/README b/Master/texmf-dist/doc/latex/mhchem/README
index c987ef97966..797dd509ec4 100644
--- a/Master/texmf-dist/doc/latex/mhchem/README
+++ b/Master/texmf-dist/doc/latex/mhchem/README
@@ -1,7 +1,7 @@
-The mhchem Bundle 2015-01-05
+The mhchem Bundle 2015-02-09
 
 containing
-- mhchem v3.18
+- mhchem v3.19
 - hpstatement v1.01
 - rsphrase v3.11
 
diff --git a/Master/texmf-dist/doc/latex/mhchem/mhchem.pdf b/Master/texmf-dist/doc/latex/mhchem/mhchem.pdf
index f07b6fd0bf9..dae451d1870 100644
--- a/Master/texmf-dist/doc/latex/mhchem/mhchem.pdf
+++ b/Master/texmf-dist/doc/latex/mhchem/mhchem.pdf
diff --git a/Master/texmf-dist/doc/latex/mhchem/mhchem.tex b/Master/texmf-dist/doc/latex/mhchem/mhchem.tex
index b0d10c6191d..418bf4f2fe0 100644
--- a/Master/texmf-dist/doc/latex/mhchem/mhchem.tex
+++ b/Master/texmf-dist/doc/latex/mhchem/mhchem.tex
@@ -62,7 +62,7 @@
   The mhchem Bundle\\[0.3em]
   \Large\textmd{%
     Documentation for the Packages\\
-    mhchem v3.18,\\% check
+    mhchem v3.19,\\% check
     hpstatement v1.01 and\\
     rsphrase v3.11}%
 }
@@ -71,7 +71,7 @@
   mhchem\makebox[0pt][l]{\textcolor{white}{NOSPAM}}@MartinHensel\makebox[1pt][l]{\textcolor{white}{.}}.de%
 }
 \date{%
-  2015-01-09% check
+  2015-02-09% check
 }
 \maketitle
 
@@ -812,6 +812,11 @@ Meaning and usage of \macro{bond} changed.
 
 \section{Most Recent Changes}% check
 
+\minisec{2015-02-09 mhchem v3.19}
+\begin{compactitem}
+\item fixed an incompatibility when running without (implicit) pdftexcmds
+\end{compactitem}
+
 \minisec{2015-01-05 mhchem v3.18}
 \begin{compactitem}
 \item rewrote further large parts using \LaTeX3, preparing for new features
diff --git a/Master/texmf-dist/tex/latex/mhchem/mhchem.sty b/Master/texmf-dist/tex/latex/mhchem/mhchem.sty
index 50d11a60c0d..aba1aec977d 100644
--- a/Master/texmf-dist/tex/latex/mhchem/mhchem.sty
+++ b/Master/texmf-dist/tex/latex/mhchem/mhchem.sty
@@ -27,7 +27,7 @@
 % This work consists of all files listed in manifest.txt.
 %
 %
-\ProvidesPackage{mhchem}[2015/01/05 v3.18 for typesetting chemical formulae]
+\ProvidesPackage{mhchem}[2015/02/09 v3.19 for typesetting chemical formulae]
 \RequirePackage{ifthen}
 \RequirePackage{calc}[1998/07/07]
 \RequirePackage{amsmath}
@@ -1065,53 +1065,61 @@
                      \resizebox{\mhchem@smallbondwidth}{\mhchem@bondheight}{\sbond}%
                      \resizebox{\mhchem@smallbondwidth}{\mhchem@bondheight}{\sbond}}%
                      \phantom{\sbond}}%
-\def\mhchem@bond#1{%
-  \ifnum\pdf@strcmp{#1}{-}=0%
-    \sbond%
-  \else\ifnum\pdf@strcmp{#1}{1}=0%
-    \sbond%
-  \else\ifnum\pdf@strcmp{#1}{=}=0%
-    \dbond%
-  \else\ifnum\pdf@strcmp{#1}{2}=0%
-    \dbond%
-  \else\ifnum\pdf@strcmp{#1}{##}=0%
-    \tbond%
-  \else\ifnum\pdf@strcmp{#1}{3}=0%
-    \tbond%
-  \else\ifnum\pdf@strcmp{#1}{~}=0%
-      \mhchem@setbondwidth%
-      \mhchem@halfbond%
-  \else\ifnum\pdf@strcmp{#1}{~-}=0%
-      \mhchem@setbondwidth%
-      \rlap{\protect\raisebox{.2ex}{\mhchem@halfbond}}%
-      \protect\raisebox{-.2ex}{\sbond}%
-  \else\ifnum\pdf@strcmp{#1}{~--}=0%
-      \mhchem@setbondwidth%
-      \rlap{\protect\raisebox{.4ex}{\mhchem@halfbond}}%
-      \rlap{\sbond}%
-      \protect\raisebox{-.4ex}{\sbond}%
-  \else\ifnum\pdf@strcmp{#1}{~=}=0%
-      \mhchem@setbondwidth%
-      \rlap{\protect\raisebox{.4ex}{\mhchem@halfbond}}%
-      \rlap{\sbond}%
-      \protect\raisebox{-.4ex}{\sbond}%
-  \else\ifnum\pdf@strcmp{#1}{-~-}=0%
-      \mhchem@setbondwidth%
-      \rlap{\protect\raisebox{.4ex}{\sbond}}%
-      \rlap{\mhchem@halfbond}%
-      \protect\raisebox{-.4ex}{\sbond}%
-  \else\ifnum\pdf@strcmp{#1}{...}=0%
-    {\cdot}{\cdot}{\cdot}%
-  \else\ifnum\pdf@strcmp{#1}{....}=0%
-    {\cdot}{\cdot}{\cdot}{\cdot}%
-  \else\ifnum\pdf@strcmp{#1}{->}=0%
-    {\rightarrow}%
-  \else\ifnum\pdf@strcmp{#1}{<-}=0%
-    {\leftarrow}%
-  \else
-    \PackageError{mhchem}{Unknown bond type in \string\bond (#1)}%
-  \fi\fi\fi\fi\fi\fi\fi\fi\fi\fi\fi\fi\fi\fi\fi%
-}
+\ExplSyntaxOn
+\char_set_catcode_letter:n { 126 } % tilde
+\cs_new_protected:Npn \mhchem@bond #1
+  {
+    \str_case:nnn {#1}
+      {
+        { - } { \sbond }
+        { 1 } { \sbond }
+        { = } { \dbond }
+        { 2 } { \dbond }
+        { ## } { \tbond }
+        { 3 } { \tbond }
+        { ~ }
+          {
+            \mhchem@setbondwidth
+            \mhchem@halfbond
+          }
+        { ~- }
+          {
+            \mhchem@setbondwidth
+            \rlap{\protect\raisebox{.2ex}{\mhchem@halfbond}}
+            \protect\raisebox{-.2ex}{\sbond}
+          }
+        { ~-- }
+          {
+            \mhchem@setbondwidth
+            \rlap{\protect\raisebox{.4ex}{\mhchem@halfbond}}
+            \rlap{\sbond}
+            \protect\raisebox{-.4ex}{\sbond}
+          }
+        { ~= }
+          {
+            \mhchem@setbondwidth
+            \rlap{\protect\raisebox{.4ex}{\mhchem@halfbond}}
+            \rlap{\sbond}
+            \protect\raisebox{-.4ex}{\sbond}
+          }
+        { -~- }
+          {
+            \mhchem@setbondwidth
+            \rlap{\protect\raisebox{.4ex}{\sbond}}
+            \rlap{\mhchem@halfbond}
+            \protect\raisebox{-.4ex}{\sbond}
+          }
+        { ... } { {\cdot}{\cdot}{\cdot} }
+        { .... } { {\cdot}{\cdot}{\cdot}{\cdot} }
+        { -> } { {\rightarrow} }
+        { <- } { {\leftarrow} }
+      }
+      {
+        %todo Tilde is not a space anymore, here
+        \PackageError{mhchem}{Unknown~bond~type~in~\string\bond~(#1)}%
+      }
+  }
+\ExplSyntaxOff  % end of Expl with tilde
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %%%%%%%%%%   loop helpers   %%%%%%%%%%
@@ -2407,15 +2415,29 @@
 %%%%%%%%%%%%%%%%%%%%%
 \cs_new_protected:Npn \__mhchem_chemfive:nnnnnn #1#2#3#4#5#6
   {
-    \mhchem@prepostscript%
-      {\mhchem@mathOrText{\smash[t]{2+}}}%
-      {\mhchem@mathOrText{\smash[t]{2}}}%
-      {\mhchem@mathOrText{#1}}%
-      {\mhchem@mathOrText{#2}}%
-      {\mhchem@mathOrText@ii{\mhchem@option@mathFont{#3}}{\text{#3}}}%
-      {\mhchem@mathOrText{#4}}%
-      {\mhchem@mathOrText{#5}}%
-      {\mhchem@mathOrText{#6}}%
+    \str_if_eq:VnTF \mhchem@option@superscriptstacked { true }
+      {
+        \mhchem@prepostscript%
+          {\mhchem@mathOrText{\smash[t]{2+}}}%
+          {\mhchem@mathOrText{\smash[t]{2}}}%
+          {\mhchem@mathOrText{#1}}%
+          {\mhchem@mathOrText{#2}}%
+          {\mhchem@mathOrText@ii{\mhchem@option@mathFont{#3}}{\text{#3}}}%
+          {\mhchem@mathOrText{#4#6}}%
+          {\mhchem@mathOrText{#5}}%
+          {}%
+      }
+      {
+        \mhchem@prepostscript%
+          {\mhchem@mathOrText{\smash[t]{2+}}}%
+          {\mhchem@mathOrText{\smash[t]{2}}}%
+          {\mhchem@mathOrText{#1}}%
+          {\mhchem@mathOrText{#2}}%
+          {\mhchem@mathOrText@ii{\mhchem@option@mathFont{#3}}{\text{#3}}}%
+          {\mhchem@mathOrText{#4}}%
+          {\mhchem@mathOrText{#5}}%
+          {\mhchem@mathOrText{#6}}%
+      }
   }
 \ExplSyntaxOff
 
@@ -2570,6 +2592,9 @@
 \def\mhchem@option@textcdot{\cdot}
 \define@key{mhchem}{textcdot}{\def\mhchem@option@textcdot{#1}}
 
+\def\mhchem@option@superscriptstacked{0}
+\define@key{mhchem}{superscriptstacked}[true]{\def\mhchem@option@superscriptstacked{#1}}%
+
 %%% begin: standard keyval handling as in many other packages
 \def\ProcessOptionsWithKV#1{%
   \let\@tempc\relax%