%% iftex TeX engine tests %% LaTeX3 Project %% %% This work may be distributed and/or modified under the %% conditions of the LaTeX Project Public License, either %% version 1.3c of this license or (at your option) any later %% version. %% %% Using ideas from: %% %% ifetex Martin Scharrer %% ifxetex Will Robertson %% iftex 0.2 Persian TeX Group / Vafa Khalighi %% ifluatex ifvtex Heiko Oberdiek %% ifptex Takayuki YATO %% ifpdf Heiko Oberdiek and LaTeX3 Project % Only load once (not needed in LaTeX, but does no harm). \csname IFTEX\string @loaded\endcsname \expandafter\let\csname IFTEX\string @loaded\endcsname\endinput % File loadable in initex % require { } # with standard catcodes. \catcode123=1 \catcode125=2 \catcode35=6 % ProvidesPackage declaration in LaTeX \begingroup\expandafter\expandafter\expandafter\endgroup \expandafter\ifx\csname ProvidesPackage\endcsname\relax\else \ProvidesPackage{iftex}[2019/11/04 v1.0b TeX engine tests] \fi % Save @ catcode, to restore at end, not needed in LaTeX. \expandafter\chardef\csname IFTEX\string @atcatcode\endcsname\catcode64 \catcode 64 11 % Message format used in several pre-existing if*tex packages % Modified here to do a hard stop and not show any error context lines. \def\IFTEX@Require#1#2#3{% #1\else \newlinechar 64\relax \errorcontextlines -1\relax \immediate\write20{@ ********************************************@ * #2 is required to compile this document.@ * Sorry!@ ********************************************}% \batchmode\read -1 to \@tempa #3% } % eTeX \protected if available. \ifx\protected\@undefined \let\IFTEX@protected\relax \else \let\IFTEX@protected\protected \fi % make sure \detokenize and \protected are available in lualatex, % but avoid defining them after the package if not already defined. { \catcode34 12 % " \catcode40 12 % ( \catcode41 12 % ) \catcode44 12 % , \catcode46 12 % . \ifx\directlua\@undefined\else \directlua{tex.enableprimitives("IFTEX@", {"detokenize","protected"})} \fi } % \Require... commands that stop if the wrong engine detected. \IFTEX@protected\def\RequireeTeX{\IFTEX@Require\ifetex{eTeX}\fi} \IFTEX@protected\def\RequirePDFTeX{\IFTEX@Require\ifpdftex{pdfTeX}\fi} \IFTEX@protected\def\RequireXeTeX{\IFTEX@Require\ifxetex{XeTeX}\fi} \IFTEX@protected\def\RequireLuaTeX{\IFTEX@Require\ifluatex{LuaTeX}\fi} \IFTEX@protected\def\RequireLuaHBTeX{\IFTEX@Require\ifluahbtex{LuaHBTeX}\fi} \IFTEX@protected\def\RequirepTeX{\IFTEX@Require\ifptex{pTeX}\fi} \IFTEX@protected\def\RequireupTeX{\IFTEX@Require\ifuptex{upTeX}\fi} \IFTEX@protected\def\RequirepTeXng{\IFTEX@Require\ifptexng{pTeX-ng}\fi} \IFTEX@protected\def\RequireVTeX{\IFTEX@Require\ifvtex{VTeX}\fi} % alephtex as aleph name too generic \IFTEX@protected\def\RequireAlephTeX{\IFTEX@Require\ifalephtex{Aleph}\fi} % tutex == has \Umathchardef == XeTeX or Lua(HB)TeX currently \IFTEX@protected\def\RequireTUTeX{\IFTEX@Require\iftutex{LuaTeX or XeTeX}\fi} % As a matter of policy over-write any existing \if*tex macro and set % by the tests here. % \csname and \let construct useful for hiding \ifzzz tokens from % outer level \if tests. \def\IFTEX@let#1#2{% \expandafter\let\csname if#1\expandafter\endcsname \csname if#2\endcsname} % etex (should always be true in latex based formats) \ifx\numexpr\@undefined \IFTEX@let{etex}{false} \else \IFTEX@let{etex}{true} \fi \IFTEX@let{eTeX}{etex} % pdftex (including in dvi mode) \IFTEX@let{IFTEX@savedpdftex}{pdftex} \ifx\pdftexversion\@undefined \IFTEX@let{pdftex}{false} \else \IFTEX@let{pdftex}{true} \fi \IFTEX@let{PDFTeX}{pdftex} % xetex \ifx\XeTeXrevision\@undefined \IFTEX@let{xetex}{false} \else \IFTEX@let{xetex}{true} \fi \IFTEX@let{XeTeX}{xetex} % luatex (including luahbtex) \ifx\directlua\@undefined \IFTEX@let{luatex}{false} \else \IFTEX@let{luatex}{true} \fi \IFTEX@let{LuaTeX}{luatex} % luahbtex (or luatex + luaharfbuzz) % Use luaharfbuzz test rather than status.luatex_engine=="luahbtex" % for issue #2. \IFTEX@let{luahbtex}{false} \ifx\directlua\@undefined \else \directlua{\IFTEX@detokenize{ if(pcall(require, 'luaharfbuzz')) then tex.print("\\let\\ifluahbtex\\iftrue ") end }} \fi \IFTEX@let{LuaHBTeX}{luahbtex} % ptex (including all variants) \ifx\kanjiskip\@undefined \IFTEX@let{ptex}{false} \else \IFTEX@let{ptex}{true} \fi \IFTEX@let{pTeX}{ptex} % uptex (including euptex) \ifx\enablecjktoken \@undefined \IFTEX@let{uptex}{false} \else \IFTEX@let{uptex}{true} \fi \IFTEX@let{upTeX}{uptex} % ptex-ng \ifx\ngbanner\@undefined \IFTEX@let{ptexng}{false} \else \IFTEX@let{ptexng}{true} \fi \IFTEX@let{pTeXng}{ptexng} % vtex \IFTEX@let{IFTEX@savedVTeX}{VTeX} \ifx\VTeXversion\@undefined \IFTEX@let{vtex}{false} \else \IFTEX@let{vtex}{true} \fi \IFTEX@let{VTeX}{vtex} % aleph \IFTEX@let{alephtex}{false} \ifptex\else \ifx\omathchardef\@undefined \else \IFTEX@let{alephtex}{true} \fi \fi \IFTEX@let{AlephTeX}{alephtex} % tutex (LuaTeX or XeTeX) \ifx\Umathchardef\@undefined \IFTEX@let{tutex}{false} \else \IFTEX@let{tutex}{true} \fi \IFTEX@let{TUTeX}{tutex} % Output mode % declare with as if with \newif \def\pdftrue{\let\ifpdf\iftrue} \def\pdffalse{\let\ifpdf\iffalse} \pdffalse \ifx\directlua\undefined \begingroup\expandafter\expandafter\expandafter\endgroup \expandafter\ifx\csname pdfoutput\endcsname\relax \ifvtex \ifnum\OpMode=3 % \pdftrue \fi \fi \else \ifnum\pdfoutput>0 % \pdftrue \fi \fi \else \directlua{\IFTEX@detokenize{ if (tex.outputmode or tex.pdfoutput or 0) > 0 then tex.print('\\pdftrue') end }} \fi % special compat for scrbase \ifx\scr@ifpdftex\@undefined\else\ifx\ifIFTEX@savedpdftex\relax\else \IFTEX@let{pdftex}{IFTEX@savedpdftex} \IFTEX@protected\def\RequirePDFTeX{\IFTEX@Require\ifPDFTeX{pdfTeX}\fi} \fi\fi \ifx\scr@ifVTeX\@undefined\else\ifx\ifIFTEX@savedVTeX\relax\else \IFTEX@let{VTeX}{IFTEX@savedVTeX} \fi\fi % restore things \catcode64 \IFTEX@atcatcode