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\ProvidesFile{gloss-sanskrit.ldf}[polyglossia: module for sanskrit]
\ifluatex
  \xpg@warning{Sanskrit is not supported with LuaTeX.\MessageBreak
I will proceed with the compilation, but\MessageBreak
the output is not guaranteed to be correct\MessageBreak
and may look very wrong.}
\fi

\RequirePackage{devanagaridigits}

\PolyglossiaSetup{sanskrit}{
  bcp47=sa-Deva,
  langtag=SAN,
  hyphennames={sanskrit,prakrit},
  hyphenmins={1,3},
  frenchspacing=true,
  fontsetup=false, % will be done below
  localnumeral=sanskritnumerals
}

% BCP-47 compliant aliases
\setlanguagealias*{sanskrit}{sa}
\setlanguagealias*[script=Devanagari]{sanskrit}{sa-Deva}
\setlanguagealias*[script=Malayalam]{sanskrit}{sa-Mlym}
\setlanguagealias*[script=Telugu]{sanskrit}{sa-Telu}
\setlanguagealias*[script=Bengali]{sanskrit}{sa-Beng}
\setlanguagealias*[script=Kannada]{sanskrit}{sa-Knda}
\setlanguagealias*[script=Gujarati]{sanskrit}{sa-Gujr}
\setlanguagealias*[script=Latin]{sanskrit}{sa-Latn}

\define@key{sanskrit}{Script}[Devanagari]{%
  \ifcsdef{fontsetup@sanskrit@#1}%
    {\csname fontsetup@sanskrit@#1\endcsname}%
    {\xpg@error{`#1' is not a valid script for Sanskrit}%
  }%
}

\define@key{sanskrit}{script}[Devanagari]{\setkeys{sanskrit}{Script=#1}}

\def\fontsetup@sanskrit@Devanagari{%
  \SetLanguageKeys{sanskrit}{scripttag=deva,script=Devanagari,bcp47=sa-Deva}
  \xpg@fontsetup@nonlatin{sanskrit}}
\def\fontsetup@sanskrit@Gujarati{%
  \SetLanguageKeys{sanskrit}{scripttag=gujr,script=Gujarati,bcp47=sa-Gujr}
  \xpg@fontsetup@nonlatin{sanskrit}}
\def\fontsetup@sanskrit@Malayalam{%
  \SetLanguageKeys{sanskrit}{scripttag=mlym,script=Malayalam,bcp47=sa-Mlym}
  \xpg@fontsetup@nonlatin{sanskrit}}
\def\fontsetup@sanskrit@Bengali{%
  \SetLanguageKeys{sanskrit}{scripttag=beng,script=Bengali,bcp47=sa-Beng}
  \xpg@fontsetup@nonlatin{sanskrit}}
\def\fontsetup@sanskrit@Kannada{%
  \SetLanguageKeys{sanskrit}{scripttag=knda,script=Kannada,bcp47=sa-Knda}
  \xpg@fontsetup@nonlatin{sanskrit}}
\def\fontsetup@sanskrit@Telugu{%
  \SetLanguageKeys{sanskrit}{scripttag=telu,script=Telugu,bcp47=sa-Relu}
  \xpg@fontsetup@nonlatin{sanskrit}}
\def\fontsetup@sanskrit@Latin{%
  \SetLanguageKeys{sanskrit}{scripttag=latn,script=Latin,bcp47=sa-Latn}
  \xpg@fontsetup@latin{sanskrit}}


\newif\ifsanskrit@devanagari@numerals
\sanskrit@devanagari@numeralstrue
\define@choicekey*+{sanskrit}{numerals}[\xpg@val\xpg@nr]{Devanagari,Western}[Devanagari]{%
   \ifcase\xpg@nr\relax
      % Devanagari:
      \sanskrit@devanagari@numeralstrue%
   \or
      % Western:
      \sanskrit@devanagari@numeralsfalse%
   \fi
   \xpg@info{Option: Sanskrit, numerals=\xpg@val}%
}{\xpg@warning{Unknown Sanskrit numeral `#1'}}


% Register default options
\xpg@initialize@gloss@options{sanskrit}{script=Devanagari,numerals=Devanagari}


\newcommand{\sanskritnumerals}[2]{\sanskritnumber{#2}}

\def\sanskritnumber#1{%
  \ifsanskrit@devanagari@numerals
    \devanagaridigits{\number#1}%
  \else
    \number#1%
  \fi%
}

\ifluatex
  \directlua{require('polyglossia-sanskrit')}%
\else
  \newXeTeXintercharclass\sanskrit@questionexclamation % ! ? ‼ ⁇ ⁈ ⁉ ‽
  \newXeTeXintercharclass\sanskrit@punctthin % : ; danda double_danda
\fi

\def\sanskrit@punctthinspace{{\unskip\thinspace}}

\def\sanskrit@punctuation{%
  \ifluatex
    \directlua{polyglossia.activate_sanskrit_punct()}%
  \else
    \XeTeXinterchartokenstate=1%
    \XeTeXcharclass `\! \sanskrit@questionexclamation
    \XeTeXcharclass `\? \sanskrit@questionexclamation
    \XeTeXcharclass `\‼ \sanskrit@questionexclamation
    \XeTeXcharclass `\⁇ \sanskrit@questionexclamation
    \XeTeXcharclass `\⁈ \sanskrit@questionexclamation
    \XeTeXcharclass `\⁉ \sanskrit@questionexclamation
    \XeTeXcharclass `\‽ \sanskrit@questionexclamation % interrobang, U+203D
    \XeTeXcharclass `\: \sanskrit@punctthin
    \XeTeXcharclass `\; \sanskrit@punctthin
    \XeTeXcharclass `\। \sanskrit@punctthin % danda, U+0964
    \XeTeXcharclass `\॥ \sanskrit@punctthin % double danda, U+0965
    \XeTeXinterchartoks \z@ \sanskrit@questionexclamation = \sanskrit@punctthinspace
    \XeTeXinterchartoks \z@ \sanskrit@punctthin = \sanskrit@punctthinspace
    \XeTeXinterchartoks \sanskrit@questionexclamation \sanskrit@punctthin = \sanskrit@punctthinspace
  \fi
}

\def\nosanskrit@punctuation{%
  \ifluatex
    \directlua{polyglossia.deactivate_sanskrit_punct()}%
  \else
    \XeTeXcharclass `\! \z@
    \XeTeXcharclass `\? \z@
    \XeTeXcharclass `\‼ \z@
    \XeTeXcharclass `\⁇ \z@
    \XeTeXcharclass `\⁈ \z@
    \XeTeXcharclass `\⁉ \z@
    \XeTeXcharclass `\‽ \z@
    \XeTeXcharclass `\: \z@
    \XeTeXcharclass `\; \z@
    \XeTeXcharclass `\। \z@
    \XeTeXcharclass `\॥ \z@
    \XeTeXinterchartokenstate=0%
  \fi
}

\def\noextras@sanskrit{%
  \nosanskrit@punctuation%
}

\def\blockextras@sanskrit{%
  \sanskrit@punctuation%
}

\endinput