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% \iffalse meta-comment
%
%% File: l3sys.dtx Copyright (C) 2015-2018 The LaTeX3 Project
%
% It may be distributed and/or modified under the conditions of the
% LaTeX Project Public License (LPPL), either version 1.3c of this
% license or (at your option) any later version. The latest version
% of this license is in the file
%
% https://www.latex-project.org/lppl.txt
%
% This file is part of the "l3kernel bundle" (The Work in LPPL)
% and all files in that bundle must be distributed together.
%
% -----------------------------------------------------------------------
%
% The development version of the bundle can be found at
%
% https://github.com/latex3/latex3
%
% for those people who are interested.
%
%<*driver>
\documentclass[full,kernel]{l3doc}
\begin{document}
\DocInput{\jobname.dtx}
\end{document}
%</driver>
% \fi
%
% \title{^^A
% The \pkg{l3sys} package: System/runtime functions^^A
% }
%
% \author{^^A
% The \LaTeX3 Project\thanks
% {^^A
% E-mail:
% \href{mailto:latex-team@latex-project.org}
% {latex-team@latex-project.org}^^A
% }^^A
% }
%
% \date{Released 2018-08-23}
%
% \maketitle
%
% \begin{documentation}
%
% \section{The name of the job}
%
% \begin{variable}[added = 2015-09-19]{\c_sys_jobname_str}
% Constant that gets the \enquote{job name} assigned when \TeX{} starts.
% \begin{texnote}
% This copies the contents of the primitive \tn{jobname}. It is a constant
% that is set by \TeX{} and should not be overwritten by the package.
% \end{texnote}
% \end{variable}
%
% \section{Date and time}
%
% \begin{variable}[added = 2015-09-22]
% {
% \c_sys_minute_int,
% \c_sys_hour_int,
% \c_sys_day_int,
% \c_sys_month_int,
% \c_sys_year_int,
% }
% The date and time at which the current job was started: these are
% all reported as integers.
% \begin{texnote}
% Whilst the underlying primitives can be altered by the user, this
% interface to the time and date is intended to be the \enquote{real}
% values.
% \end{texnote}
% \end{variable}
%
% \section{Engine}
%
% \begin{function}[added = 2015-09-07, EXP, pTF]
% {
% \sys_if_engine_luatex:,
% \sys_if_engine_pdftex:,
% \sys_if_engine_ptex: ,
% \sys_if_engine_uptex: ,
% \sys_if_engine_xetex:
% }
% \begin{syntax}
% \cs{sys_if_engine_pdftex:TF} \Arg{true code} \Arg{false code}
% \end{syntax}
% Conditionals which allow engine-specific code to be used. The names
% follow naturally from those of the engine binaries: note that the
% |(u)ptex| tests are for \epTeX{} and \eupTeX{} as \pkg{expl3} requires
% the \eTeX{} extensions. Each conditional is true for
% \emph{exactly one} supported engine. In particular,
% |\sys_if_engine_ptex_p:| is true for \epTeX{} but false for \eupTeX{}.
% \end{function}
%
% \begin{variable}[added = 2015-09-19]{\c_sys_engine_str}
% The current engine given as a lower case string: one of
% |luatex|, |pdftex|, |ptex|, |uptex| or |xetex|.
% \end{variable}
%
% \section{Output format}
%
% \begin{function}[added = 2015-09-19, EXP, pTF]
% {
% \sys_if_output_dvi:,
% \sys_if_output_pdf:
% }
% \begin{syntax}
% \cs{sys_if_output_dvi:TF} \Arg{true code} \Arg{false code}
% \end{syntax}
% Conditionals which give the current output mode the \TeX{} run is
% operating in. This is always one of two outcomes, DVI mode or
% PDF mode. The two sets of conditionals are thus complementary and
% are both provided to allow the programmer to emphasise the most
% appropriate case.
% \end{function}
%
% \begin{variable}[added = 2015-09-19]{\c_sys_output_str}
% The current output mode given as a lower case string: one of
% |dvi| or |pdf|.
% \end{variable}
%
% \end{documentation}
%
% \begin{implementation}
%
% \section{\pkg{l3sys} implementation}
%
% \begin{macrocode}
%<*initex|package>
% \end{macrocode}
%
% \begin{macrocode}
%<@@=sys>
% \end{macrocode}
%
% \subsection{The name of the job}
%
% \begin{variable}{\c_sys_jobname_str}
% Inherited from the \LaTeX3 name for the primitive: this needs to
% actually contain the text of the job name rather than the name of
% the primitive, of course.
% \begin{macrocode}
%<*initex>
\tex_everyjob:D \exp_after:wN
{
\tex_the:D \tex_everyjob:D
\str_const:Nx \c_sys_jobname_str { \tex_jobname:D }
}
%</initex>
%<*package>
\str_const:Nx \c_sys_jobname_str { \tex_jobname:D }
%</package>
% \end{macrocode}
% \end{variable}
%
% \subsection{Time and date}
%
% \begin{variable}
% {
% \c_sys_minute_int,
% \c_sys_hour_int,
% \c_sys_day_int,
% \c_sys_month_int,
% \c_sys_year_int,
% }
% Copies of the information provided by \TeX{}
% \begin{macrocode}
\int_const:Nn \c_sys_minute_int
{ \int_mod:nn { \tex_time:D } { 60 } }
\int_const:Nn \c_sys_hour_int
{ \int_div_truncate:nn { \tex_time:D } { 60 } }
\int_const:Nn \c_sys_day_int { \tex_day:D }
\int_const:Nn \c_sys_month_int { \tex_month:D }
\int_const:Nn \c_sys_year_int { \tex_year:D }
% \end{macrocode}
% \end{variable}
%
% \subsection{Detecting the engine}
%
% \begin{macro}{\@@_const:nn}
% Set the |T|, |F|, |TF|, |p| forms of |#1| to be constants equal to
% the result of evaluating the boolean expression~|#2|.
% \begin{macrocode}
\cs_new_protected:Npn \@@_const:nn #1#2
{
\bool_if:nTF {#2}
{
\cs_new_eq:cN { #1 :T } \use:n
\cs_new_eq:cN { #1 :F } \use_none:n
\cs_new_eq:cN { #1 :TF } \use_i:nn
\cs_new_eq:cN { #1 _p: } \c_true_bool
}
{
\cs_new_eq:cN { #1 :T } \use_none:n
\cs_new_eq:cN { #1 :F } \use:n
\cs_new_eq:cN { #1 :TF } \use_ii:nn
\cs_new_eq:cN { #1 _p: } \c_false_bool
}
}
% \end{macrocode}
% \end{macro}
%
% \begin{macro}[pTF, EXP]
% {
% \sys_if_engine_luatex:,
% \sys_if_engine_pdftex:,
% \sys_if_engine_ptex:,
% \sys_if_engine_uptex:,
% \sys_if_engine_xetex:
% }
% \begin{variable}{\c_sys_engine_str}
% Set up the engine tests on the basis exactly one test should be true.
% Mainly a case of looking for the appropriate marker primitive. For
% \upTeX{}, there is a complexity in that setting |-kanji-internal=sjis|
% or |-kanji-internal=euc| effective makes it more like \pTeX{}. In those
% cases we therefore report \pTeX{} rather than \upTeX{}.
% \begin{macrocode}
\str_const:Nx \c_sys_engine_str
{
\cs_if_exist:NT \tex_luatexversion:D { luatex }
\cs_if_exist:NT \tex_pdftexversion:D { pdftex }
\cs_if_exist:NT \tex_kanjiskip:D
{
\bool_lazy_and:nnTF
{ \cs_if_exist_p:N \tex_disablecjktoken:D }
{ \int_compare_p:nNn { \tex_jis:D "2121 } = { "3000 } }
{ uptex }
{ ptex }
}
\cs_if_exist:NT \tex_XeTeXversion:D { xetex }
}
\tl_map_inline:nn { { luatex } { pdftex } { ptex } { uptex } { xetex } }
{
\@@_const:nn { sys_if_engine_ #1 }
{ \str_if_eq_p:Vn \c_sys_engine_str {#1} }
}
% \end{macrocode}
% \end{variable}
% \end{macro}
%
% \subsection{Detecting the output}
%
% \begin{macro}[pTF, EXP]
% {
% \sys_if_output_dvi:,
% \sys_if_output_pdf:
% }
% \begin{variable}{\c_sys_output_str}
% This is a simple enough concept: the two views here are complementary.
% \begin{macrocode}
\str_const:Nx \c_sys_output_str
{
\int_compare:nNnTF
{ \cs_if_exist_use:NF \tex_pdfoutput:D { 0 } } > { 0 }
{ pdf }
{ dvi }
}
\@@_const:nn { sys_if_output_dvi }
{ \str_if_eq_p:Vn \c_sys_output_str { dvi } }
\@@_const:nn { sys_if_output_pdf }
{ \str_if_eq_p:Vn \c_sys_output_str { pdf } }
% \end{macrocode}
% \end{variable}
% \end{macro}
%
% \subsection{Randomness}
%
% This candidate function is placed there because
% \cs{sys_if_rand_exist:TF} is used in \pkg{l3fp-rand}.
%
% \begin{macro}[EXP, pTF]{\sys_if_rand_exist:}
% Currently, randomness exists under \pdfTeX{}, \LuaTeX{}, \pTeX{} and \upTeX{}.
% \begin{macrocode}
\@@_const:nn { sys_if_rand_exist }
{ \cs_if_exist_p:N \tex_uniformdeviate:D }
% \end{macrocode}
% \end{macro}
%
% \begin{macrocode}
%</initex|package>
% \end{macrocode}
%
%\end{implementation}
%
%\PrintIndex
|