tex-compiler/texmf-dist/tex/latex/l3kernel/expl3.ltx

%%
%% This is file `expl3.ltx',
%% generated with the docstrip utility.
%%
%% The original source files were:
%%
%% expl3.dtx  (with options: `2ekernel,loader')
%% 
%% Copyright (C) 1990-2020 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.
%% 
%% File: expl3.dtx
\def\ExplFileDate{2020-08-07}%
\let\ExplLoaderFileDate\ExplFileDate
\global\expandafter\let\csname\detokenize
  {c__kernel_expl_date_tl}\endcsname\ExplFileDate
\everyjob\expandafter{\the\everyjob
  \message{L3 programming layer <\ExplFileDate>}%
}
\protected\def\ProvidesExplPackage
  {\@expl@provides@file@@Nnnnnn\ProvidesPackage{Package}}
\protected\def\ProvidesExplClass
  {\@expl@provides@file@@Nnnnnn\ProvidesClass{Document Class}}
\protected\def\ProvidesExplFile
  {\@expl@provides@file@@Nnnnnn\ProvidesFile{File}}
\protected\long\def\@expl@provides@file@@Nnnnnn#1#2#3#4#5#6%
  {%
    \ifnum0%
        \ifdefined#11\fi
        \ifx\relax#1\else1\fi
        =11
      \expandafter#1%
    \else
      \@expl@provides@generic@@wnnw{#2}%
    \fi
      {#3}[{#4 \ifx\relax#5\relax\else v#5\space\fi #6}]%
    \ExplSyntaxOn
  }
\protected\long\def\@expl@provides@generic@@wnnw#1\fi#2[#3]%
  {%
    \immediate\write-1{#1: #2 #3}%
  }
\begingroup\expandafter\expandafter\expandafter\endgroup
\expandafter\ifx\csname tex\string _let:D\endcsname\relax
  \expandafter\@firstofone
\else
  \expandafter\@gobble
\fi
  {\input{expl3-code.tex}}%
\begingroup\expandafter\expandafter\expandafter\endgroup
\expandafter\ifx\csname tex\string _let:D\endcsname\relax
  \expandafter\endinput
\fi
\ifcsname\detokenize{c__kernel_expl_date_tl}\endcsname
  \expandafter\ifx\csname\detokenize
      {c__kernel_expl_date_tl}\endcsname\ExplLoaderFileDate
  \else
    \ExplSyntaxOn
    \__kernel_msg_set:nnn { kernel } { mismatched-expl3 }
      {
        Mismatched~expl3~detected!~Loading~expl3~will~abort.
        \\ \\
        The~version~of~expl3~preloaded~in~LaTeX~is~
        \c__kernel_expl_date_tl,~but~the~version~of~expl3~you~are~
        trying~to~load~is~dated~\ExplLoaderFileDate.~This~is~most~
        likely~due~to~a~stray~format~file~in~the~user~tree.~Please~
        make~sure~that~your~LaTeX~format~is~updated.
      }
    \exp_after:wN \ExplSyntaxOff \use:n
      {
        \__kernel_msg_critical:nn { kernel } { mismatched-expl3 }
        \use:c { fi: } \use:c { fi: }
      }
  \fi
\else
  \ifodd\csname\detokenize{l__kernel_expl_bool}\endcsname
  \else
    \ExplSyntaxOn
    \bool_if_exist:NF \g__expl_reload_bool
      { \bool_new:N \g__expl_reload_bool }
    \ExplSyntaxOff
  \fi
\fi
\ifcsname\detokenize{g__expl_reload_bool}\endcsname
  \ExplSyntaxOn
  \bool_gset_true:N \g__expl_reload_bool
\else
  \bool_new:N \g__expl_reload_bool
\fi
\tl_if_exist:NF \c__expl_def_ext_tl
  { \tl_const:Nn \c__expl_def_ext_tl { def } }
\cs_gset_protected:Npn \__kernel_sys_configuration_load:n #1
  {
    \cs_undefine:c { ver@ #1 .def }
    \@onefilewithoptions {#1} [ ] [ ]
      \c__expl_def_ext_tl
  }
\keys_define:nn { sys }
  {
    backend .choices:nn =
      { dvipdfmx , dvips , dvisvgm , pdfmode , xdvipdfmx }
      { \sys_load_backend:n {#1} } ,
    check-declarations .code:n =
      {
        \sys_load_debug:
        \debug_on:n { check-declarations }
      } ,
    driver .meta:n = { backend = #1 } ,
    enable-debug .code:n =
      \sys_load_debug: ,
    log-functions .code:n =
      {
        \sys_load_debug:
        \debug_on:n { log-functions }
      } ,
    suppress-backend-headers .bool_gset_inverse:N
      = \g__kernel_backend_header_bool ,
    suppress-backend-headers .initial:n = false ,
    undo-recent-deprecations .code:n =
      {
        \bool_gset_true:N \g__kernel_deprecation_undo_recent_bool
        \sys_load_deprecation:
      }
  }
\cs_if_exist:NF \@expl@sys@load@backend@@
  {
    \tl_put_left:Nn \document
      {
        \endgroup
        \@expl@sys@load@backend@@
        \begingroup
      }
  }
\cs_gset_protected:Npn \@expl@sys@load@backend@@
  {
    \str_if_exist:NF \c_sys_backend_str
      { \sys_load_backend:n { } }
  }
\cs_if_free:cTF { ver@expl3.sty }
  {
    \tex_everyjob:D \exp_after:wN
      {
        \tex_the:D \tex_everyjob:D
        \sys_everyjob:
      }
  }
  { \sys_everyjob: }
\reverse_if:N \if_cs_exist:N \s__expl_stop
  \scan_new:N \s__expl_stop
\fi:
\cs_if_exist:NF \@expl@push@filename@@
  {
    \tl_put_left:Nn  \@pushfilename { \@expl@push@filename@@ }
    \tl_put_right:Nn \@pushfilename { \@expl@push@filename@aux@@ }
  }
\cs_gset_protected:Npn \@expl@push@filename@@
  {
    \exp_args:Nx \__kernel_file_input_push:n
      {
        \tl_to_str:N \@currname .
        \tl_to_str:N \@currext
      }
    \tl_put_left:Nx \l__expl_status_stack_tl
      {
        \bool_if:NTF \l__kernel_expl_bool
          { 1 }
          { 0 }
      }
    \ExplSyntaxOff
  }
\cs_gset_protected:Npn \@expl@push@filename@aux@@ #1#2#3
  {
    \str_gset:Nn \g_file_curr_name_str {#3}
    #1 #2 {#3}
  }
\cs_if_exist:NF \@expl@pop@filename@@
  {
    \tl_put_right:Nn \@popfilename
      { \@expl@pop@filename@@ }
  }
\cs_gset_protected:Npn \@expl@pop@filename@@
  {
    \__kernel_file_input_pop:
    \tl_if_empty:NTF \l__expl_status_stack_tl
      { \ExplSyntaxOff }
      { \exp_after:wN \__expl_status_pop:w \l__expl_status_stack_tl \s__expl_stop }
  }
\cs_gset_protected:Npn \__expl_status_pop:w #1#2 \s__expl_stop
  {
    \tl_set:Nn \l__expl_status_stack_tl {#2}
    \int_if_odd:nTF {#1}
      { \ExplSyntaxOn }
      { \ExplSyntaxOff }
  }
\tl_if_exist:NF \l__expl_status_stack_tl
  {
    \tl_new:N \l__expl_status_stack_tl
    \tl_set:Nn \l__expl_status_stack_tl { 0 }
  }
\ExplSyntaxOff
%% 
%%
%% End of file `expl3.ltx'.