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+% --------------------------------------------------------------------------
+% the CHEMMACROS package
+%
+% comprehensive support for typesetting chemistry documents
+%
+% --------------------------------------------------------------------------
+% 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.
+% --------------------------------------------------------------------------
+% The chemmacros package consists of the following files
+% - chemmacros.sty, chemmacros4.sty, chemmacros5.sty,
+% - chemmacros_en.tex, chemmacros_en.pdf,
+% - quite a number of module files following the naming scheme
+% chemmacros.module.*.code.tex
+% - README
+ % --------------------------------------------------------------------------
+\RequirePackage{expl3,xparse,l3keys2e}
+\ExplSyntaxOn
+
+% --------------------------------------------------------------------------
+% package information:
+\ProvidesExplPackage
+ {chemmacros5}
+ {\c_chemmacros_date_tl}
+ {\c_chemmacros_version_tl}
+ {\c_chemmacros_info_tl \c_space_tl (CN)}
+
+% --------------------------------------------------------------------------
+\msg_new:nnn {chemmacros} {package-option}
+ {
+ Unknown~ option~ `#1'!~ Since~ v5.0~ chemmacros~ has~ no~ package~
+ options~ any~ more!
+ }
+\cs_generate_variant:Nn \msg_warning:nnn { nnV }
+
+\keys_define:nn {chemmacros/package-options}
+ {
+ compatibility .code:n = ,
+ unknown .code:n =
+ \msg_warning:nnV {chemmacros} {package-option} \CurrentOption
+ }
+
+\ProcessKeysPackageOptions {chemmacros/package-options}
+
+% --------------------------------------------------------------------------
+% messages:
+\msg_new:nnn {chemmacros} {module-missing}
+ {
+ You've~ requested~ the~ chemmacros~ module~ `#1'~ but~ it~ appears~ to~
+ be~ missing~ on~ your~ system.~ Maybe~ you've~ misspelled~ the~ name?~
+ Loading~ the~ module~ will~ abort~ \msg_line_context:
+ }
+
+\msg_new:nnn {chemmacros} {loading-module}
+ {
+ (chemmacros) \c_space_tl \c_space_tl \c_space_tl \c_space_tl
+ Loading~ module~ `#1'...
+ }
+
+% --------------------------------------------------------------------------
+% variants of kernel functions:
+\cs_generate_variant:Nn \tl_if_eq:nnTF { xx , V }
+\cs_generate_variant:Nn \seq_set_split:Nnn { Nnx }
+\cs_generate_variant:Nn \prop_item:Nn { NV }
+\cs_generate_variant:Nn \seq_item:Nn { cV }
+\cs_generate_variant:Nn \int_to_arabic:n { V }
+\cs_generate_variant:Nn \tl_replace_once:Nnn { NnV }
+\cs_generate_variant:Nn \prop_gput:Nnn { cxx , NVf }
+\cs_generate_variant:Nn \msg_error:nnn { nnV }
+\cs_generate_variant:Nn \msg_warning:nnn { nnV }
+\cs_generate_variant:Nn \msg_warning:nnnn { nnV }
+\cs_generate_variant:Nn \vbox_set:Nn { NV }
+\cs_generate_variant:Nn \keys_define:nn { x }
+\cs_generate_variant:Nn \keys_set:nn { x , nx }
+
+% --------------------------------------------------------------------------
+% temporary variables:
+\tl_new:N \l__chemmacros_tmpa_tl
+\tl_new:N \l__chemmacros_tmpb_tl
+\tl_new:N \l__chemmacros_tmpc_tl
+\tl_new:N \l__chemmacros_tmpd_tl
+
+\bool_new:N \l__chemmacros_tmpa_bool
+\bool_new:N \l__chemmacros_tmpb_bool
+\bool_new:N \l__chemmacros_tmpc_bool
+
+\dim_new:N \l__chemmacros_tmpa_dim
+\dim_new:N \l__chemmacros_tmpb_dim
+\dim_new:N \l__chemmacros_tmpc_dim
+
+\seq_new:N \l__chemmacros_tmpa_seq
+\seq_new:N \l__chemmacros_tmpb_seq
+\seq_new:N \l__chemmacros_tmpc_seq
+
+\int_new:N \l__chemmacros_tmpa_int
+\int_new:N \l__chemmacros_tmpb_int
+\int_new:N \l__chemmacros_tmpc_int
+
+\box_new:N \l__chemmacros_tmpa_box
+\box_new:N \l__chemmacros_tmpb_box
+\box_new:N \l__chemmacros_tmpc_box
+
+\clist_new:N \l__chemmacros_tmpa_clist
+\clist_new:N \l__chemmacros_tmpb_clist
+\clist_new:N \l__chemmacros_tmpc_clist
+
+% --------------------------------------------------------------------------
+% module mechanism:
+\tl_const:Nn \c__chemmacros_module_extension_tl {code.tex}
+\tl_const:Nn \c__chemmacros_module_prefix_tl {chemmacros.module}
+
+\cs_new_protected:Npn \chemmacros_load_modules:n #1
+ { \clist_map_inline:nn {#1} { \chemmacros_load_module:n {##1} } }
+
+\cs_new_protected:Npn \chemmacros_load_module:n #1
+ {
+ \tl_set:Nx \l__chemmacros_tmpa_tl { \tl_trim_spaces:n {#1} }
+ \__chemmacros_load_module:V \l__chemmacros_tmpa_tl
+ }
+
+\cs_new_protected:Npn \__chemmacros_load_module:n #1
+ {
+ \chemmacros_if_module_loaded:nF {#1}
+ {
+ \chemmacros_if_module_exist:nTF {#1}
+ {
+ \msg_log:nnn {chemmacros} {loading-module} {#1}
+ \@onefilewithoptions
+ {\c__chemmacros_module_prefix_tl.#1}[][]
+ \c__chemmacros_module_extension_tl
+ }
+ { \msg_error:nnn {chemmacros} {module-missing} {#1} }
+ }
+ }
+\cs_generate_variant:Nn \__chemmacros_load_module:n { V }
+
+\prg_new_conditional:Npnn \chemmacros_if_module_loaded:n #1 {T,F,TF}
+ {
+ \cs_if_exist:cTF {chemmacros-module-#1-loaded}
+ { \prg_return_true: }
+ { \prg_return_false: }
+ }
+
+\prg_new_conditional:Npnn \chemmacros_if_module_exist:n #1 {T,F,TF}
+ {
+ \file_if_exist:nTF
+ {\c__chemmacros_module_prefix_tl.#1.\c__chemmacros_module_extension_tl}
+ { \prg_return_true: }
+ { \prg_return_false: }
+ }
+
+\cs_new_protected:Npn \chemmacros_module:nnn #1#2#3
+ {
+ \cs_new:cpn {chemmacros-module-#2-loaded} {chemmacros:~module~`#2'}
+ \ProvidesFile
+ {\c__chemmacros_module_prefix_tl.#2.\c__chemmacros_module_extension_tl}
+ [
+ \c_chemmacros_date_tl
+ \c_space_tl
+ v \c_chemmacros_version_tl
+ \c_space_tl
+ chemmacros~ module~ `#2'~ #3
+ ]
+ \bool_if:nF {#1} { \ExplSyntaxOn }
+ }
+
+% --------------------------------------------------------------------------
+% define a chemmacros module:
+% standard modules are written in the expl3 programming environment, the
+% starred version only uses a 2e programming environment, i.e., with @ as a
+% letter
+% #1: boolean
+% #2: name
+% #3: description
+\NewDocumentCommand \ChemModule {smm}
+ { \chemmacros_module:nnn {#1} {#2} {#3} }
+
+% --------------------------------------------------------------------------
+% command for loading modules:
+\NewDocumentCommand \usechemmodule {m} { \chemmacros_load_modules:n {#1} }
+
+% --------------------------------------------------------------------------
+% load default modules:
+\chemmacros_load_modules:n
+ {
+ base, lang, greek, chemformula, % <= those need to be present for all modules
+ acid-base, symbols, charges, particles, phases , nomenclature
+ }
+
+% --------------------------------------------------------------------------
+\tex_endinput:D
+
+% --------------------------------------------------------------------------
+Modules: (* = preloaded)
+ - internal modules:
+ - base *
+ - lang *
+ - greek *
+ - chemformula *
+ - tikz
+ - user modules:
+ - acid-base *
+ - all
+ - charges *
+ - isotopes
+ - mechanisms
+ - newman
+ - nomenclature *
+ - orbital
+ - particles *
+ - phases *
+ - reactions
+ - redox
+ - scheme
+ - spectroscopy
+ - symbols *
+ - thermodynamics
+ - units
+ - xfrac
+
+% --------------------------------------------------------------------------
+Version history
+2015/08/29 v5.0 - major update of chemmacros; please refer to the end of file
+ chemmacros4.sty for the earlier history