iftex.sty

%%
%% This is file `iftex.sty',

%% 
%%   __________________________________
%%   Copyright © 2010–2013 Persian TeX Group
%% 
%%   License information appended.
%% 
%% 
\csname iftexloaded\endcsname
\let\iftexloaded\endinput
\expandafter\ifx\csname ProvidesPackage\endcsname\relax\else
  \ProvidesPackage{iftex}
    [2013/04/04 v0.2 Provides if(tex) conditional for PDFTeX, XeTeX, and LuaTeX]
\fi
\def\RequirePDFTeX{%
  \ifPDFTeX\else
    \begingroup
      \errorcontextlines=-1\relax
      \newlinechar=10\relax
      \errmessage{^^J
      ********************************************^^J
      * PDFTeX is required to compile this document.^^J
      * Sorry!^^J
      ********************************************}%
    \endgroup
  \fi}
\def\RequireXeTeX{%
  \ifXeTeX\else
    \begingroup
      \errorcontextlines=-1\relax
      \newlinechar=10\relax
      \errmessage{^^J
      ********************************************^^J
      * XeTeX is required to compile this document.^^J
      * Sorry!^^J
      ********************************************}%
    \endgroup
  \fi}
\def\RequireLuaTeX{%
  \ifLuaTeX\else
    \begingroup
      \errorcontextlines=-1\relax
      \newlinechar=10\relax
      \errmessage{^^J
      ********************************************^^J
      * LuaTeX is required to compile this document.^^J
      * Sorry!^^J
      ********************************************}%
    \endgroup
  \fi}
\expandafter\ifx\csname ifPDFTeX\endcsname\relax\else
  \expandafter\endinput
\fi
\expandafter\ifx\csname ifXeTeX\endcsname\relax\else
  \expandafter\endinput
\fi
\expandafter\ifx\csname ifLuaTeX\endcsname\relax\else
  \expandafter\endinput
\fi
\newif\ifPDFTeX
\begingroup\expandafter\expandafter\expandafter\endgroup
\expandafter\ifx\csname pdfmatch\endcsname\relax
  \PDFTeXfalse
\else
  \PDFTeXtrue
\fi
\newif\ifXeTeX
\begingroup\expandafter\expandafter\expandafter\endgroup
\expandafter\ifx\csname XeTeXinterchartoks\endcsname\relax
  \XeTeXfalse
\else
  \XeTeXtrue
\fi
\newif\ifLuaTeX
\begingroup\expandafter\expandafter\expandafter\endgroup
\expandafter\ifx\csname directlua\endcsname\relax
  \LuaTeXfalse
\else
  \LuaTeXtrue
\fi
%% 
%% Copyright © 2010–2013      by Persian TeX Group     <persian-tex@tug.org>
%% 
%% Distributable under the LaTeX Project Public License,
%% version 1.3c or higher (your choice). The latest version of
%% this license is at: http://www.latex-project.org/lppl.txt
%% 
%% This work is "maintained" (as per LPPL maintenance status)
%% by Persian TeX Group.
%% 
%% 
%% 
%% 
%%
%% End of file `iftex.sty'.