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+% --------------------------------------------------------------------------
+%
+% the CHEMMACROS package -- module: `mechanisms'
+%
+% --------------------------------------------------------------------------
+% 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 2011-2015 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{mechanisms}{2015/06/09 reaction mechanisms}
+
+\RequirePackage{amstext}
+
+% --------------------------------------------------------------------------
+% reaction mechanisms
+% \mech[<type>]
+% <type> - substitutions: {}, 1, 2, se, 1e, 2e, ar
+% - eliminations: e, e1, e2, cb
+\tl_new:N \l__chemmacros_mechanisms_type_tl
+\tl_new:N \l__chemmacros_mechanisms_mol_tl
+\tl_new:N \l__chemmacros_mechanisms_ar_tl
+
+\cs_new_protected:Npn \__chemmacros_set_mechanisms:nnn #1#2#3
+ {
+ \tl_set:Nn \l__chemmacros_mechanisms_type_tl { #1 }
+ \tl_set:Nn \l__chemmacros_mechanisms_mol_tl { #2 }
+ \tl_set:Nn \l__chemmacros_mechanisms_ar_tl { #3 }
+ }
+
+\keys_define:nn {chemmacros/mechanisms}
+ {
+ type .choice: ,
+ type / .code:n =
+ {
+ \__chemmacros_set_mechanisms:nnn { S }
+ {
+ \c_math_toggle_token
+ \c_math_subscript_token { \text {N} }
+ \c_math_toggle_token
+ }
+ { }
+ } ,
+ type / 1 .code:n =
+ {
+ \__chemmacros_set_mechanisms:nnn { S }
+ {
+ \c_math_toggle_token
+ \c_math_subscript_token { \text {N} }
+ \c_math_toggle_token
+ 1
+ }
+ { }
+ } ,
+ type / 2 .code:n =
+ {
+ \__chemmacros_set_mechanisms:nnn { S }
+ {
+ \c_math_toggle_token
+ \c_math_subscript_token { \text {N} }
+ \c_math_toggle_token
+ 2
+ }
+ { }
+ } ,
+ type / se .code:n =
+ {
+ \__chemmacros_set_mechanisms:nnn { S }
+ {
+ \c_math_toggle_token
+ \c_math_subscript_token { \text {E} }
+ \c_math_toggle_token
+ }
+ { }
+ } ,
+ type / 1e .code:n =
+ {
+ \__chemmacros_set_mechanisms:nnn { S }
+ {
+ \c_math_toggle_token
+ \c_math_subscript_token { \text {E} }
+ \c_math_toggle_token
+ 1
+ }
+ { }
+ } ,
+ type / 2e .code:n =
+ {
+ \__chemmacros_set_mechanisms:nnn { S }
+ {
+ \c_math_toggle_token
+ \c_math_subscript_token { \text {E} }
+ \c_math_toggle_token
+ 2
+ }
+ { }
+ } ,
+ type / ar .code:n =
+ {
+ \__chemmacros_set_mechanisms:nnn { S }
+ {
+ \c_math_toggle_token
+ \c_math_subscript_token { \text {E} }
+ \c_math_toggle_token
+ }
+ { Ar - }
+ } ,
+ type / e .code:n =
+ { \__chemmacros_set_mechanisms:nnn { E } { } { } } ,
+ type / e1 .code:n =
+ { \__chemmacros_set_mechanisms:nnn { E } { 1 } { } } ,
+ type / e2 .code:n =
+ { \__chemmacros_set_mechanisms:nnn { E } { 2 } { } } ,
+ type / cb .code:n =
+ {
+ \__chemmacros_set_mechanisms:nnn { E }
+ {
+ 1
+ \c_math_toggle_token
+ \c_math_subscript_token { \text {cb} }
+ \c_math_toggle_token
+ }
+ { }
+ } ,
+ type .default:n =
+ }
+
+\cs_new_protected:Npn \chemmacros_mechanisms:n #1
+ {
+ \tl_if_blank:nTF {#1}
+ { \keys_set:nn {chemmacros/mechanisms} { type } }
+ { \keys_set:nn {chemmacros/mechanisms} { type = #1 } }
+ \mbox
+ {
+ \tl_use:N \l__chemmacros_mechanisms_ar_tl
+ \tl_use:N \l__chemmacros_mechanisms_type_tl
+ \tl_use:N \l__chemmacros_mechanisms_mol_tl
+ }
+ }
+
+\NewDocumentCommand \mech {o}
+ {
+ \IfNoValueTF {#1}
+ { \chemmacros_mechanisms:n { } }
+ { \chemmacros_mechanisms:n {#1} }
+ }
+
+% --------------------------------------------------------------------------