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\ProvidesPackage{librecaslon}[%
   2013/10/15 (Bob Tennent)  Supports LibreCaslon fonts for all LaTeX engines. ] 

\RequirePackage{ifxetex,ifluatex,textcomp}

\newif\iflibrecaslon@otf
\ifxetex
  \librecaslon@otftrue
\else\ifluatex
  \librecaslon@otftrue
\else  % [pdf]LaTeX
  \librecaslon@otffalse
\fi\fi

\newif\iflibrecaslon@lining \librecaslon@liningtrue

\newcommand*{\LibreCaslonText@scale}{1}  
\RequirePackage{xkeyval}
\DeclareOptionX{scaled}{\renewcommand*{\LibreCaslonText@scale}{#1}}
\DeclareOptionX{scale}{\renewcommand*{\LibreCaslonText@scale}{#1}}

\DeclareOptionX{type1}{\librecaslon@otffalse}

\DeclareOptionX{lining}[true]{%
\@nameuse{if#1}%
  \librecaslon@liningtrue
\else
  librecaslon@liningfalse
\fi
}
\DeclareOptionX{lf}[true]{%
\@nameuse{if#1}%
  \librecaslon@liningtrue
\else
  librecaslon@liningfalse
\fi
}
\DeclareOptionX{oldstyle}[true]{%
\@nameuse{if#1}%
  \librecaslon@liningfalse
\else
  \librecaslon@liningtrue
\fi
}

\DeclareOptionX{osf}[true]{%
\@nameuse{if#1}%
  \librecaslon@liningfalse
\else
  \librecaslon@liningtrue
\fi
}

\ProcessOptionsX\relax

\iflibrecaslon@otf
  \iflibrecaslon@lining
    \def\librecaslon@figurestyle{Monospaced}
  \else
    \def\librecaslon@figurestyle{OldStyle}
  \fi

\else % type1

  \iflibrecaslon@lining
    \def\librecaslon@figurealign{T} 
    \def\librecaslon@figurestyle{LF} 
  \else
    \def\librecaslon@figurealign{} 
    \def\librecaslon@figurestyle{OsF} 
  \fi
\fi


\iflibrecaslon@otf
  \RequirePackage{fontspec}
\else
  \RequirePackage{fontenc,fontaxes}
\fi

\iflibrecaslon@otf
  \ifxetex\XeTeXtracingfonts=1\fi
  \defaultfontfeatures{
     Ligatures = TeX ,
     Extension = .otf ,
     Scale     = \LibreCaslonText@scale ,
  }
  \setmainfont
      [ Numbers = {\librecaslon@figurestyle},
        UprightFont    = *-Regular ,
        ItalicFont     = *-Italic ,
        BoldFont       = *-Bold , 
        BoldItalicFont = *-BoldItalic ]
      {LibreCaslonText}
  \providecommand\useosf{%
    \edef\librecaslon@figurestyle{OldStyle}
    \defaultfontfeatures{
       Ligatures = TeX ,
       Extension = .otf ,
       Scale = \LibreCaslonText@scale ,
    }
    \setmainfont
        [ Numbers = {\librecaslon@figurestyle},
          UprightFont    = *-Regular ,
          ItalicFont     = *-Italic ,
          BoldFont       = *-Bold , 
          BoldItalicFont = *-BoldItalic ]
        {LibreCaslonText}
    \defaultfontfeatures{}
  }
  \newfontfamily\librecaslon
      [ Numbers = {\librecaslon@figurestyle},
        UprightFont    = *-Regular ,
        ItalicFont     = *-Italic ,
        BoldFont       = *-Bold , 
        BoldItalicFont = *-BoldItalic ]
      {LibreCaslonText}
  \newfontfamily\librecaslonOsF
        [ Numbers = {OldStyle},
        UprightFont    = *-Regular ,
        ItalicFont     = *-Italic ,
        BoldFont       = *-Bold , 
        BoldItalicFont = *-BoldItalic ]
      {LibreCaslonText}
  \newfontfamily\librecaslonLF
        [ Numbers = {Monospaced},
        UprightFont    = *-Regular ,
        ItalicFont     = *-Italic ,
        BoldFont       = *-Bold , 
        BoldItalicFont = *-BoldItalic ]
      {LibreCaslonText}

  \providecommand\sufigures{\librecaslonOsF\addfontfeatures{VerticalPosition=Superior}}  
%                           !!!!!!!!!!!!!!!


\else % type1

  \def\librecaslonfamily{LibreCaslonText-\librecaslon@figurealign\librecaslon@figurestyle}
  \providecommand*\librecaslon{\fontfamily{\librecaslonfamily}\selectfont}
  \providecommand*\librecaslonLF{\fontfamily{LibreCaslonText-TLF}\selectfont}
  \providecommand*\librecaslonOsF{\fontfamily{LibreCaslonText-OsF}\selectfont}

  \fa@naming@exception{figures}{{superior}{proportional}}{Sup}
  \fa@naming@exception{figures}{{superior}{tabular}}{Sup}
  \providecommand\sufigures{\@nomath\sufigures\fontfigurestyle{superior}\selectfont}
  \renewcommand*\rmdefault{\librecaslonfamily}
  \providecommand*\useosf{\edef\librecaslon@figurealign{}\edef\librecaslon@figurestyle{OsF}%
     \renewcommand*{\rmdefault}{LibreCaslonText-OsF}}

\fi
\DeclareTextFontCommand{\textsu}{\sufigures}

% turn off defaults in case other fonts are selected:
\iflibrecaslon@otf
  \defaultfontfeatures{}
\fi

\endinput