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-%% 
-%% This is file `phy-ab.sty',
-%% the `ab' module of `physics2' package.
-%% 
-%% ******************************************************
-%% * This work may be distributed and/or modified under *
-%% * the conditions of the LaTeX Project Public License *
-%% *                                                    *
-%% *     http://www.latex-project.org/lppl.txt          *
-%% *                                                    *
-%% * either version 1.3c of this license or any later   *
-%% * version.                                           *
-%% ******************************************************
-%% 
-%% This work has the LPPL maintenance status `maintained'.
-%% 
-%% The Current Maintainer of this work is Zhang Tingxuan.
-%% 
-\ProvidesFile{phy-ab.sty}
-  [2023/04/02 `ab' (autobraces) module of `physics2.sty']
-% \phy@requiremodule{common}
-% The `tightbraces' bool option, true or false.
-\phy@define@key{ab}{tightbraces}[true]{\def\@phy@abtight{#1}}
-% Execute the default values to keys in this module.
-\phy@setkeys{ab}{tightbraces=true}
-\phy@processkeyopt{ab}
-% \phy@abopen and \phy@abclose,
-% internal definition for all commands in this module.
-\ifx\@phy@abtight\phy@true
-  \let\phy@abopen\delopen
-  \let\phy@abclose\delclose
-\else
-  \let\phy@abopen\left
-  \let\phy@abclose\right
-\fi
-% The internal version of \ab. #1: `ab' or `mb'; #2: open symbol; (#3: arg-spec; #4: definition)
-\def\phy@AB@gen#1#2{\expandafter\DeclareDocumentCommand\csname phy@#1@\string#2\endcsname}
-% #1 (r<token1><token2>): inner content.
-\phy@AB@gen{ab}({r()}{\phy@abopen(#1\phy@abclose)}
-\phy@AB@gen{ab}[{r[]}{\phy@abopen[#1\phy@abclose]}
-\phy@AB@gen{ab}\{{r\{\}}{\phy@abopen\{#1\phy@abclose\}}
-\phy@AB@gen{ab}|{r||}{\phy@abopen|#1\phy@abclose|}
-\phy@AB@gen{ab}\|{r\|\|}{\phy@abopen\|#1\phy@abclose\|}
-\phy@AB@gen{ab}<{r<>}{\phy@abopen<#1\phy@abclose>}
-\phy@AB@gen{ab}\lbrace{r\lbrace\rbrace}{\phy@abopen\lbrace#1\phy@abclose\rbrace}
-\phy@AB@gen{ab}\vert{r\vert\vert}{\phy@abopen\vert#1\phy@abclose\vert}
-\phy@AB@gen{ab}\Vert{r\Vert\Vert}{\phy@abopen\Vert#1\phy@abclose\Vert}
-\phy@AB@gen{ab}\langle{r\langle\rangle}{\phy@abopen\langle#1\phy@abclose\rangle}
-% #1 (m): \biggg; #2 (r<token1><token2>): inner content.
-% \endgroup's in the end of definition are corresponding to \begingroup in \phy@d@l@genxm.
-\phy@AB@gen{mb}({mr()}{\mathopen#1(#2\mathclose#1)\endgroup}
-\phy@AB@gen{mb}[{mr[]}{\mathopen#1[#2\mathclose#1]\endgroup}
-\phy@AB@gen{mb}\{{mr\{\}}{\mathopen#1\lbrace#2\mathclose#1\rbrace\endgroup}
-\phy@AB@gen{mb}|{mr||}{\mathopen#1\vert#2\mathclose#1\vert\endgroup}
-\phy@AB@gen{mb}\|{mr\|\|}{\mathopen#1\Vert#2\mathclose#1\Vert\endgroup}
-\phy@AB@gen{mb}<{mr<>}{\mathopen#1\langle#2\mathclose#1\rangle\endgroup}
-\phy@AB@gen{mb}\lbrace{mr\lbrace\rbrace}{\mathopen#1\lbrace#2\mathclose#1\rbrace\endgroup}
-\phy@AB@gen{mb}\vert{mr\vert\vert}{\mathopen#1\vert#2\mathclose#1\vert\endgroup}
-\phy@AB@gen{mb}\Vert{mr\Vert\Vert}{\mathopen#1\Vert#2\mathclose#1\Vert\endgroup}
-\phy@AB@gen{mb}\langle{mr\langle\rangle}{\mathopen#1\langle#2\mathclose#1\rangle\endgroup}
-% \phy@del, the automatic braces. #1: opensymbol; #2: close symbol; #3
-\def\phy@del#1#2#3{\phy@abopen#1#3\phy@abclose#2}
-\expandafter\def\csname phy@del\string*\endcsname#1#2#3{\mathopen#1#3\mathclose#2}
-\expandafter\def\csname phy@del\string\big\endcsname#1#2#3{\bigl#1#3\bigr#2}
-\expandafter\def\csname phy@del\string\Big\endcsname#1#2#3{\Bigl#1#3\Bigr#2}
-\expandafter\def\csname phy@del\string\bigg\endcsname#1#2#3{\biggl#1#3\biggr#2}
-\expandafter\def\csname phy@del\string\Bigg\endcsname#1#2#3{\Biggl#1#3\Biggr#2}
-\expandafter\def\csname phy@del\string\biggg\endcsname#1#2#3{\bigggl#1#3\bigggr#2}
-\expandafter\def\csname phy@del\string\Biggg\endcsname#1#2#3{\Bigggl#1#3\Bigggr#2}
-% \phy@d@lx (phy_del_x): the internal defination of \ab.
-% #1: `mb', according to \phy@AB@gen; #2: `ab'; #3: star or big or left delimiter.
-\def\phy@d@lx#1#2#3{%
-  \ifcsname phy@del\string#3\endcsname%
-    \def\reserved@a{#1}% #3 is star or \biggg, then get the next argument.
-  \else%
-    \def\reserved@a{#2}% #3 is delimiter, the braces are automatic.
-  \fi%
-  \csname phy@d@lx\reserved@a\endcsname#3}
-% The first two arguments of \phy@d@lx need to be generated by the following two commands.
-\def\phy@d@l@genxm#1{% generate arguments like `mb'
-  \expandafter\def\csname phy@d@lx#1\endcsname##1##2{%
-    \begingroup% \endgroup in \phy@AB@gen{mb}<open><arg><definition>
-    \ifx##1*\let\phy@tempa=\relax\else\let\phy@tempa=##1\fi
-    \csname phy@#1@\string##2\endcsname\phy@tempa##2}}
-\def\phy@d@l@genxa#1{% generate arguments like `ab'
-  \expandafter\def\csname phy@d@lx#1\endcsname##1{%
-    \csname phy@#1@\string##1\endcsname##1}}
-% Generate the `mb' and `ab' arguments.
-\phy@d@l@genxm{mb}
-\phy@d@l@genxa{ab}
-% \ab(<subformula>), after \ab can be a star or \biggg.
-\DeclareRobustCommand\ab{\phy@d@lx{mb}{ab}}
-% \phy@d@l@geny: define commands like \pab. #1: cs; #2: open symbol; #3: close symbol.
-\def\phy@d@l@geny#1#2#3{%
-  \DeclareDocumentCommand#1{som}{% ##1: star; ##2: bigg (csname); ##3: subformula.
-    \IfBooleanTF{##1}%
-      {#2##3#3}%
-      {\IfValueTF{##2}%
-        {\csname##2l\endcsname#2##3\csname##2r\endcsname#3}%
-        {\phy@abopen#2##3\phy@abclose#3}%
-      }%
-  }%
-}
-\phy@d@l@geny\pab()
-\phy@d@l@geny\bab[]
-\phy@d@l@geny\Bab\lbrace\rbrace
-\phy@d@l@geny\vab\vert\vert
-\phy@d@l@geny\aab\langle\rangle
-\phy@d@l@geny\Vab\Vert\Vert
-\endinput
-%% End of file `phy-ab.sty'.