iftex.sty
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%%
%% 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'.