\ProvidesPackage{blx-case-latex2e}
[\abx@cptid]

% auxiliary macros
% babel's \languagename has weird catcodes,
% so we \detokenize our language names

\def\blx@listgadd@switched#1#2{\listgadd{#2}{#1}}

\ifundef\expanded
  {\protected\def\blx@deifinlist#1{%
     \begingroup
     \edef\blx@tempa{\endgroup
       \blx@deifinlist@i{#1}}%
     \blx@tempa}%
   \protected\def\blx@deifinlist@i#1{%
     \expandafter\ifinlist\expandafter{\detokenize{#1}}}%
   %
   \protected\def\blx@listdxadd@switched#1{%
     \begingroup
     \edef\blx@tempa{\endgroup
       \blx@listdxadd@switched@i{#1}}%
     \blx@tempa}%
   \protected\def\blx@listdxadd@switched@i#1{%
     \expandafter\blx@listgadd@switched\expandafter{\detokenize{#1}}}}
  {\def\blx@deifinlist#1{%
     \expandafter\expandafter\expandafter\ifinlist
     \expandafter\expandafter\expandafter{%
       \expandafter\detokenize\expandafter{\expanded{#1}}}}%
   %
   \def\blx@listdxadd@switched#1{%
     \expandafter\expandafter\expandafter\blx@listgadd@switched
     \expandafter\expandafter\expandafter{%
       \expandafter\detokenize\expandafter{\expanded{#1}}}}}

\def\blx@listdxadd#1#2{\blx@listdxadd@switched{#2}{#1}}


% we don't have l3text's (pseudo)BCP47 language codes here
\newrobustcmd*{\DeclareBabelToExplLanguageMapping}[2]{%
  \blx@warning{The command '\string\DeclareBabelToExplLanguageMapping'%
    \MessageBreak
    is only available with the expl3 case changing\MessageBreak
    implementation ('casechanger=expl3').\MessageBreak
    Ignoring}}

\newrobustcmd*{\UndeclareBabelToExplLanguageMapping}[1]{%
  \blx@warning{The command '\string\UndeclareBabelToExplLanguageMapping'%
    \MessageBreak
    is only available with the expl3 case changing\MessageBreak
    implementation ('casechanger=expl3').\MessageBreak
    Ignoring}}

\def\blx@maketext@lowercase{\MakeLowercase}

\def\blx@maketext@uppercase{\MakeUppercase}

\def\blx@maketext@makecapital{\MakeCapital}

% {<text>}
\newrobustcmd{\MakeCapital}[1]{%
  \begingroup
  \blx@mkcp@init
  \protected@edef\blx@tempa{#1}%
  \expandafter\blx@mkcp@parse\blx@tempa\@empty\blx@mkcp@end}

\def\blx@mkcp@init{%
  \def\blx@mkcp@iec{\noexpand\blx@mkcp@iec\noexpand}%
  \def\blx@mkcp@bbl{\noexpand\blx@mkcp@bbl\noexpand}%
  \def\blx@mkcp@sgl{\noexpand\blx@mkcp@sgl\noexpand}%
  \def\blx@mkcp@dbl{\noexpand\blx@mkcp@dbl\noexpand}%
  \def\do##1{\def##1{\blx@mkcp@sgl##1}}\abx@dosingleaccents
  \def\do##1{\def##1{\blx@mkcp@dbl##1}}\abx@dodoubleaccents
  \def\IeC##1{\blx@mkcp@iec\IeC{##1}}%
  \def\@tabacckludge##1{%
    \expandafter\blx@mkcp@sgl\csname\string##1\endcsname}}

\begingroup
\catcode`\"=\active
\gappto\blx@mkcp@init{%
  \ifnum\catcode`\"=\active
    \def"#1{\blx@mkcp@bbl"\noexpand#1}%
  \fi}
\endgroup

\def\blx@mkcp@parse{%
  \futurelet\@let@token\blx@mkcp@eval}

\long\def\blx@mkcp@eval{%
  \ifx\@let@token\blx@mkcp@iec
    \expandafter\blx@mkcp@getiec
  \fi
  \ifx\@let@token\blx@mkcp@bbl
    \expandafter\blx@mkcp@gettwo
  \fi
  \ifx\@let@token\blx@mkcp@sgl
    \expandafter\blx@mkcp@gettwo
  \fi
  \ifx\@let@token\blx@mkcp@dbl
    \expandafter\blx@mkcp@getthree
  \fi
  \blx@mkcp@case}

\def\blx@mkcp@getiec#1\blx@mkcp@case#2#3#4{%
  \blx@mkcp@case{#2#3{#4}}}

\def\blx@mkcp@gettwo#1\blx@mkcp@case#2#3#4{%
  \blx@mkcp@case{#2#3#4}}

\def\blx@mkcp@getthree#1\blx@mkcp@case#2#3#4#5{%
  \blx@mkcp@case{#2#3#4#5}}

\long\def\blx@mkcp@case#1{%
  \begingroup
  \def\i{I}\def\j{J}%
  \def\do##1##2{\let##1##2\do}%
  \expandafter\do\@uclclist\relax{\relax\@gobble}%
  \uppercase{\protected@edef\blx@tempa{\endgroup\blx@mkcp@end#1}}%
  \blx@tempa}

\protected\long\def\blx@mkcp@end#1\blx@mkcp@end{%
  \let\blx@mkcp@iec\noexpand
  \let\blx@mkcp@bbl\noexpand
  \let\blx@mkcp@sgl\noexpand
  \let\blx@mkcp@dbl\noexpand
  \protected@edef\blx@tempa{\endgroup#1}%
  \blx@tempa}


\DeclareBiblatexOption{global,type,entry}[boolean]{bibtexcaseprotection}[true]{%
  \ifstrequal{#1}{true}
    {}
    {\ifstrequal{#1}{false}
       {\blx@warning
          {The option 'bibtexcaseprotection=false' is only\MessageBreak
           available with expl3}}
       {\blx@err@invopt{bibtexcaseprotection=#1}
          {Valid values for 'bibtexcaseprotection' are 'true' and
           'false'\MessageBreak
           (but 'false' only works with expl3 code)}}}}

% {<text>}
\newrobustcmd*{\MakeSentenceCase}{%
  \@ifstar\blx@mksc@i\blx@mksc@ii}


% \blx@cmksc@lang is defined in biblatex.sty
% it expands to the applicable language for the title field
\def\blx@mksc@i{%
  \blx@deifinlist\blx@mksc@lang\blx@cmksc@lang
    {\blx@mksc@ii}
    {\@firstofone}}

\long\def\blx@mksc@ii#1{%
  \begingroup
  \let\blx@tempa\@empty
  \let\blx@tempb\@empty
  \blx@mksc@init
  \protected@edef\@tempa{#1}%
  \expandafter\blx@mksc@parse\@tempa\blx@mksc@end}

\def\blx@mksc@init{%
  \blx@mkcp@init
  \def\blx@mkcp@nil{\noexpand\blx@mkcp@nil\noexpand}%
  \def\i{\blx@mkcp@nil\i}\def\j{\blx@mkcp@nil\j}%
  \def\do##1{%
    \ifx##1\relax
    \else
      \def##1{\blx@mkcp@nil##1}%
      \expandafter\do
    \fi}%
  \expandafter\do\@uclclist\relax}

\def\blx@mksc@parse{%
  \futurelet\@let@token\blx@mksc@eval}

\let\blx@asttoken=*

\def\blx@mksc@eval{%
  \ifx\@let@token\blx@mksc@end
    \expandafter\blx@mksc@end
  \fi
  \ifx\@let@token\bgroup
    \expandafter\blx@mksc@group
  \fi
  \ifx\@let@token\@sptoken
    \expandafter\blx@mksc@space
  \fi
  \ifx\@let@token\blx@mkcp@nil
    \expandafter\blx@mksc@getone
  \fi
  \ifx\@let@token\blx@mkcp@iec
    \expandafter\blx@mksc@getiec
  \fi
  \ifx\@let@token\blx@mkcp@bbl
    \expandafter\blx@mksc@gettwo
  \fi
  \ifx\@let@token\blx@mkcp@sgl
    \expandafter\blx@mksc@gettwo
  \fi
  \ifx\@let@token\blx@mkcp@dbl
    \expandafter\blx@mksc@getthree
  \fi
  \ifx\@let@token\blx@asttoken
    \expandafter\blx@mksc@cs
  \fi
  \if\noexpand\@let@token\relax
    \expandafter\blx@mksc@cs
  \fi
  \blx@mksc@other}

\def\blx@mksc@end#1\blx@mksc@end{%
  \blx@mksc@eject
  \let\blx@mkcp@nil\noexpand
  \let\blx@mkcp@iec\noexpand
  \let\blx@mkcp@bbl\noexpand
  \let\blx@mkcp@sgl\noexpand
  \let\blx@mkcp@dbl\noexpand
  \let\MakeUppercase\relax
  \let\MakeLowercase\relax
  \protected@edef\blx@tempa{\endgroup\blx@tempa}%
  \blx@tempa}

\long\def\blx@mksc@group#1\blx@mksc@other#2{%
  \futurelet\@let@token\blx@mksc@ingroup#2&{#2}%
  \blx@mksc@endhead
  \blx@mksc@parse}

\long\def\blx@mksc@ingroup#1&#2{%
  \if\noexpand\@let@token\relax
    \ifx\@let@token\blx@mkcp@sgl
      \blx@mksc@nocase{{#2}}%
    \else
      \ifx\@let@token\blx@mkcp@dbl
        \blx@mksc@nocase{{#2}}%
      \else
        \blx@mksc@locase{{#2}}%
      \fi
    \fi
  \else
    \blx@mksc@nocase{{#2}}%
  \fi}

\def\blx@mksc@space{\def\blx@mksc@space##1\blx@mksc@other}
\csuse{blx@mksc@space} {%
  \blx@mksc@anycase{ }%
  \blx@mksc@endhead
  \blx@mksc@parse}

\long\def\blx@mksc@cs#1\blx@mksc@other#2{%
  \ifcat\noexpand~\noexpand#2%
    \blx@mksc@locase{#2}%
  \else
    \blx@mksc@nocase{#2}%
  \fi
  \blx@mksc@endhead
  \blx@mksc@parse}

\def\blx@mksc@getiec#1\blx@mksc@other#2#3#4{%
  \blx@mksc@other{#2#3{#4}}}

\def\blx@mksc@getone#1\blx@mksc@other#2#3{%
  \blx@mksc@other{#2#3}}

\def\blx@mksc@gettwo#1\blx@mksc@other#2#3#4{%
  \blx@mksc@other{#2#3#4}}

\def\blx@mksc@getthree#1\blx@mksc@other#2#3#4#5{%
  \blx@mksc@other{#2#3#4#5}}

\long\def\blx@mksc@other#1{%
  \blx@mksc@locase{#1}%
  \blx@mksc@endhead
  \blx@mksc@parse}

\def\blx@mksc@locase{%
  \appto\blx@tempb}

\def\blx@mksc@nocase{%
  \blx@mksc@eject
  \appto\blx@tempa}

\def\blx@mksc@anycase{%
  \ifx\blx@tempb\@empty
    \expandafter\appto
    \expandafter\blx@tempa
  \else
    \expandafter\appto
    \expandafter\blx@tempb
  \fi}

\def\blx@mksc@eject{%
  \ifx\blx@tempb\@empty
  \else
    \eappto\blx@tempa{\noexpand\MakeLowercase{\expandonce\blx@tempb}}%
    \let\blx@tempb\@empty
  \fi}

\def\blx@mksc@endhead{%
  \ifx\blx@tempb\@empty
  \else
    \eappto\blx@tempa{\noexpand\MakeCapital{\expandonce\blx@tempb}}%
    \let\blx@tempb\@empty
  \fi
  \let\blx@mksc@endhead\relax}



% {<language,language,...>}
\newrobustcmd*{\DeclareCaseLangs}{%
  \@ifstar
    {\blx@defcaselangs}
    {\global\let\blx@cmksc@lang\@empty
     \blx@defcaselangs}}

\def\blx@defcaselangs#1{%
  \ifblank{#1}
    {}
    {\forcsvlist{\blx@listdxadd\blx@cmksc@lang}{#1}}}

% \DeclareCaseLangs invocation is in biblatex.sty

\newrobustcmd*{\ifcaselang}[1][\blx@languagename]{%
  \blx@deifinlist{#1}\blx@cmksc@lang}

\endinput