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+% --------------------------------------------------------------------------
+%
+% the CHEMMACROS package -- module: `thermodynamics'
+%
+% --------------------------------------------------------------------------
+% 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 2011-2017 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{thermodynamics}{2015/06/09 thermodynamics}
+
+\RequirePackage {siunitx}
+
+\tl_new:N \l__chemmacros_state_pre_tl
+\tl_new:N \l__chemmacros_state_post_tl
+\tl_new:N \l__chemmacros_state_sp_left_tl
+\tl_new:N \l__chemmacros_state_sb_left_tl
+\tl_new:N \l__chemmacros_state_sp_right_tl
+\tl_new:N \l__chemmacros_state_sb_right_tl
+\tl_new:N \l__chemmacros_state_sb_pos_tl
+\tl_new:N \l__chemmacros_state_symbol_tl
+\tl_new:N \l__chemmacros_state_unit_tl
+
+\tl_set:Nn \l__chemmacros_state_pre_tl { \changestate }
+\tl_set:Nn \l__chemmacros_state_sp_right_tl { \standardstate }
+\tl_set:Nn \l__chemmacros_state_sb_pos_tl {left}
+
+\chemmacros_define_keys:nn {thermodynamics}
+ {
+ pre .tl_set:N = \l__chemmacros_state_pre_tl ,
+ post .tl_set:N = \l__chemmacros_state_post_tl ,
+ superscript-left .tl_set:N = \l__chemmacros_state_sp_left_tl ,
+ superscript-right .tl_set:N = \l__chemmacros_state_sp_right_tl ,
+ superscript .meta:n = { superscript-right = #1 } ,
+ subscript-left .tl_set:N = \l__chemmacros_state_sb_left_tl ,
+ subscript-right .tl_set:N = \l__chemmacros_state_sb_right_tl ,
+ subscript .meta:n = { subscript-left = #1 } ,
+ unit .tl_set:N = \l__chemmacros_state_unit_tl ,
+ unit .groups:n = {variables}
+ }
+
+\cs_new_protected:Npn \chemmacros_state:nn #1#2
+ {
+ % pre (\Delta)
+ % post
+ % superscript-left
+ % superscript-right (\standardstate)
+ % subscript-left
+ % subscript-right
+ \group_begin:
+ \chemmacros_set_keys:nn {thermodynamics} {#1}
+ \ensuremath
+ {
+ \chemmacros_text:V \l__chemmacros_state_pre_tl
+ \c_math_superscript_token
+ { \chemmacros_text:V \l__chemmacros_state_sp_left_tl }
+ \c_math_subscript_token
+ { \chemmacros_text:V \l__chemmacros_state_sb_left_tl }
+ #2
+ \c_math_superscript_token
+ { \chemmacros_text:V \l__chemmacros_state_sp_right_tl }
+ \c_math_subscript_token
+ { \chemmacros_text:V \l__chemmacros_state_sb_right_tl }
+ \chemmacros_text:V \l__chemmacros_state_post_tl
+ }
+ \group_end:
+ }
+\cs_generate_variant:Nn \chemmacros_state:nn { nV }
+
+\DeclareDocumentCommand \state { O{}m }
+ { \chemmacros_state:nn {#1} {#2} }
+
+\cs_new_protected:Npn \chemmacros_declare_state:Nn #1#2
+ {
+ \chemmacros_define_keys:xn
+ {thermodynamics/\chemmacros_remove_backslash:N #1}
+ {
+ pre .meta:nn = {chemmacros/thermodynamics} { pre = ##1 } ,
+ post .meta:nn = {chemmacros/thermodynamics} { post = ##1 } ,
+ superscript-left .meta:nn = {chemmacros/thermodynamics} { superscript-left = ##1 } ,
+ superscript-right .meta:nn = {chemmacros/thermodynamics} { superscript-right = ##1 } ,
+ superscript .meta:n = { superscript-right = ##1 } ,
+ subscript-left .meta:nn = {chemmacros/thermodynamics} { subscript-left = ##1 } ,
+ subscript-right .meta:nn = {chemmacros/thermodynamics} { subscript-right = ##1 } ,
+ subscript .meta:n = { subscript-left = ##1 } ,
+ subscript-pos .choices:nn =
+ { left , right }
+ { \tl_set_eq:NN \l__chemmacros_state_sb_pos_tl \l_keys_choice_tl } ,
+ symbol .tl_set:N = \l__chemmacros_state_symbol_tl ,
+ unit .tl_set:N = \l__chemmacros_state_unit_tl
+ }
+ \DeclareDocumentCommand #1 { sO{}D(){}m }
+ {
+ \group_begin:
+ \chemmacros_set_keys:xn
+ {thermodynamics/\chemmacros_remove_backslash:N #1}
+ {#2}
+ \tl_if_blank:nF {##3}
+ {
+ \chemmacros_set_keys:nx {thermodynamics}
+ { subscript-\l__chemmacros_state_sb_pos_tl = \exp_not:n {##3} }
+ }
+ \ensuremath
+ {
+ \chemmacros_state:nV {##2} \l__chemmacros_state_symbol_tl
+ \chemmacros_set_keys_groups:nnn {thermodynamics} {variables} {##2}
+ \IfBooleanF {##1} { = \SI {##4} { \l__chemmacros_state_unit_tl } }
+ }
+ \group_end:
+ }
+ }
+
+\NewChemMacroset {State} {mm}
+ { \chemmacros_declare_state:Nn #1 {#2} }
+
+% --------------------------------------------------------------------------
+% predefined:
+\NewChemState \enthalpy { symbol = H , unit = \kilo\joule\per\mole }
+\NewChemState \entropy { symbol = S , unit = \joule\per\kelvin\per\mole , pre = }
+\NewChemState \gibbs { symbol = G , unit = \kilo\joule\per\mole }
+
+\ChemCompatibilityTo{5.3}
+ \DeclareChemDeprecated \State \state
+ \DeclareChemDeprecated \Enthalpy \enthalpy
+ \DeclareChemDeprecated \Entropy \entropy
+ \DeclareChemDeprecated \Gibbs \gibbs
+\EndChemCompatibility
+
+% --------------------------------------------------------------------------