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-rw-r--r--Master/texmf-dist/source/latex/base/ltmiscen.dtx186
1 files changed, 162 insertions, 24 deletions
diff --git a/Master/texmf-dist/source/latex/base/ltmiscen.dtx b/Master/texmf-dist/source/latex/base/ltmiscen.dtx
index 122ef3b39bf..8cd61207514 100644
--- a/Master/texmf-dist/source/latex/base/ltmiscen.dtx
+++ b/Master/texmf-dist/source/latex/base/ltmiscen.dtx
@@ -1,6 +1,6 @@
% \iffalse meta-comment
%
-% Copyright 1993-2018
+% Copyright (C) 1993-2019
% The LaTeX3 Project and any individual authors listed elsewhere
% in this file.
%
@@ -13,7 +13,7 @@
% The latest version of this license is in
% https://www.latex-project.org/lppl.txt
% and version 1.3c or later is part of all distributions of LaTeX
-% version 2005/12/01 or later.
+% version 2008 or later.
%
% This file has the LPPL maintenance status "maintained".
%
@@ -32,7 +32,7 @@
%<*driver>
% \fi
\ProvidesFile{ltmiscen.dtx}
- [2018/10/11 v1.1o LaTeX Kernel (Misc. Environments)]
+ [2019/08/29 v1.1p LaTeX Kernel (Misc. Environments)]
% \iffalse
\documentclass{ltxdoc}
\GetFileInfo{ltmiscen.dtx}
@@ -72,6 +72,7 @@
% \changes{v1.1d}{1996/06/03}{Move setting of verbatim font and
% \cs{@noligs}.}
% \changes{v1.1g}{1998/08/17}{(RmS) Minor documentation fixes.}
+% \changes{v1.1p}{2019/08/27}{Make various commands robust}
%
% \section{Miscellaneous Environments}
% This section implements the basic environment mechanism, and also
@@ -505,8 +506,13 @@
% remember line number. Used by \cs{@badend} to display
% position of non-matching \cs{begin}.}
% \changes{v1.1e}{1996/07/26}{remove \cs{global} before \cs{@ignore...}}
+% \changes{v1.1p}{2019/08/27}{Make command robust}
% \begin{macrocode}
-\def\begin#1{%
+%</2ekernel>
+%<*2ekernel|latexrelease>
+%<latexrelease>\IncludeInRelease{2019/10/01}%
+%<latexrelease> {\begin}{Making \begin/\end robust}%
+\DeclareRobustCommand\begin[1]{%
\@ifundefined{#1}%
{\def\reserved@a{\@latex@error{Environment #1 undefined}\@eha}}%
{\def\reserved@a{\def\@currenvir{#1}%
@@ -515,17 +521,123 @@
\@ignorefalse
\begingroup\@endpefalse\reserved@a}
% \end{macrocode}
-% \end{macro}
+% A version that doesn't start out with \cs{relax} when in
+% typesetting mode would be the following, but since \cs{begin}
+% issues a \cs{begingroup} it wouldn't help much with respect to
+% allowing things like \cs{noalign} or \cs{multicolumn} inside.
+% \begin{macrocode}
+%\edef\begin
+% {\unexpanded{%
+% \ifx\protect\@typeset@protect
+% \expandafter\@gobble
+% \fi
+% \protect
+% }%
+% \expandafter\noexpand\csname begin \endcsname
+% }
+%\@namedef{begin }#1{%
+% \@ifundefined{#1}%
+% {\def\reserved@a{\@latex@error{Environment #1 undefined}\@eha}}%
+% {\def\reserved@a{\def\@currenvir{#1}%
+% \edef\@currenvline{\on@line}%
+% \csname #1\endcsname}}%
+% \@ignorefalse
+% \begingroup\@endpefalse\reserved@a}
+% \end{macrocode}
%
% \begin{macro}{\end}
+% While \cs{begin} was made robust simply by using
+% \cs{DeclareRobustCommand} we need to be a bit more subtle with
+% \cs{end} as there are packages out there that try to look into
+% the top-level contents of \verb=\end{foo}= (that is at the expansion
+% of \verb=\endfoo=) to see if it contains certain macros. This is
+% done by hitting \verb=\end{foo}= with three \cs{expandafter}s,
+% the first to get
+%\begin{verbatim}
+% \csname endfoo\endcsname \@checkend{foo}% etc.
+%\end{verbatim}
+% the second to expand the \cs{csname}, i.e., to get to
+%\begin{verbatim}
+% \endfoo \@checkend{foo}% etc.
+%\end{verbatim}
+% and the third to finally get to the top-level content of
+% \verb=\endfoo=, i.e.
+%\begin{verbatim}
+% <top-level content of \endfoo> \@checkend{foo}% etc.
+%\end{verbatim}
+% Therefore a robust replacement should produce the same results
+% after three expansions (there first is obviously different).
+%
+% Basically the definition of \cs{end} should either produce
+% \verb*=\protect\end = (when not doing typesetting) or it should
+% produce \verb*=\end = (without the \cs{protect}) when doing typesetting.
+% Furthermore, it should (when in typesetting mode) show exactly the
+% same result as
+% \verb*=\end = (which is the original fragile definition
+% of \cs{end}) when you expand either of them twice, i.e.,
+%\begin{verbatim}
+% \endfoo \@checkend{foo}% etc.
+%\end{verbatim}
+% That is achieved with the code below (which is worth studying
+% carefully).
+%
+% There is some trickery involved here: in particular we use
+% \cs{romannumeral} to change a single expansion into three
+% successive expansions in one go. That primitive expands until it
+% has scanned a number (0 in this case, so it doesn't produce any
+% output) and so it allows us to place arbitrary many
+% \cs{expandafter}s inside that are all going to be executed when
+% \cs{romannumeral} is hit by a single \cs{expandafter}.
+%
% \changes{v1.1e}{1996/07/26}{remove \cs{global} before \cs{@ignore...}}
+% \changes{v1.1p}{2019/08/27}{Make command robust}
+%
+% \begin{macrocode}
+\edef\end
+ {\unexpanded{%
+ \romannumeral
+ \ifx\protect\@typeset@protect
+ \expandafter %1
+ \expandafter %2
+ \expandafter %1
+ \expandafter %3 expands the \csname inside \end<space>
+ \expandafter %1
+ \expandafter %2 expands \end<space>
+ \expandafter %1 expands the \else
+ \z@
+ \else
+ \expandafter\z@\expandafter\protect
+ \fi
+ }%
+ \expandafter\noexpand\csname end \endcsname
+ }
+% \end{macrocode}
+% And here is the original definition of \cs{end} the way it was in
+% \LaTeX{} for several decades now hidden in \verb*=\end =.
% \begin{macrocode}
-\def\end#1{%
+\@namedef{end }#1{%
\csname end#1\endcsname\@checkend{#1}%
\expandafter\endgroup\if@endpe\@doendpe\fi
\if@ignore\@ignorefalse\ignorespaces\fi}
+%</2ekernel|latexrelease>
+%<latexrelease>\EndIncludeInRelease
+% \end{macrocode}
+% An here the rollback in case that is ever needed.
+% \begin{macrocode}
+%<latexrelease>\IncludeInRelease{0000/00/00}%
+%<latexrelease> {\begin}{Making \begin/\end robust}%
+%<latexrelease>\kernel@make@fragile\begin
+%<latexrelease>\kernel@make@fragile\end
+%<latexrelease>
+%<latexrelease>\EndIncludeInRelease
+%<*2ekernel>
% \end{macrocode}
% \end{macro}
+% \end{macro}
+%
+%
+%
+%
%
% \begin{macro}{\@checkend}
% \begin{macrocode}
@@ -598,6 +710,7 @@
% \begin{macrocode}
\def\@icentercr[#1]{\vskip #1\ignorespaces}
% \end{macrocode}
+%
% \end{macro}
%
%
@@ -615,15 +728,57 @@
% \end{macrocode}
% \end{environment}
%
+%
+% \begin{macrocode}
+%</2ekernel>
+%<*2ekernel|latexrelease>
+%<latexrelease>\IncludeInRelease{2019/10/01}%
+%<latexrelease> {\centering}{Make commands robust}%
+% \end{macrocode}
+%
% \begin{macro}{\centering}
% \begin{macrocode}
-\def\centering{%
+\DeclareRobustCommand\centering{%
\let\\\@centercr
\rightskip\@flushglue\leftskip\@flushglue
\parindent\z@\parfillskip\z@skip}
% \end{macrocode}
% \end{macro}
%
+% \begin{macro}{\raggedright}
+% \begin{macrocode}
+\DeclareRobustCommand\raggedright{%
+ \let\\\@centercr\@rightskip\@flushglue \rightskip\@rightskip
+ \leftskip\z@skip
+ \parindent\z@}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macro}{\raggedleft}
+% \begin{macrocode}
+\DeclareRobustCommand\raggedleft{%
+ \let\\\@centercr
+ \rightskip\z@skip\leftskip\@flushglue
+ \parindent\z@\parfillskip\z@skip}
+% \end{macrocode}
+% \end{macro}
+%
+% \begin{macrocode}
+%</2ekernel|latexrelease>
+%<latexrelease>\EndIncludeInRelease
+%<latexrelease>\IncludeInRelease{0000/00/00}%
+%<latexrelease> {\centering}{Make commands robust}%
+%<latexrelease>
+%<latexrelease>\kernel@make@fragile\centering
+%<latexrelease>\kernel@make@fragile\raggedright
+%<latexrelease>\kernel@make@fragile\raggedleft
+%<latexrelease>
+%<latexrelease>\EndIncludeInRelease
+%<*2ekernel>
+% \end{macrocode}
+%
+%
+%
% \begin{macro}{\@rightskip}
% \begin{macrocode}
\newskip\@rightskip \@rightskip \z@skip
@@ -644,14 +799,6 @@
% \end{macrocode}
% \end{environment}
%
-% \begin{macro}{\raggedright}
-% \begin{macrocode}
-\def\raggedright{%
- \let\\\@centercr\@rightskip\@flushglue \rightskip\@rightskip
- \leftskip\z@skip
- \parindent\z@}
-% \end{macrocode}
-% \end{macro}
%
% \begin{environment}{flushright}
% \changes{v0.9h}{1993/12/13}{Removed optional argument of \cs{item}}
@@ -667,15 +814,6 @@
% \end{macrocode}
% \end{environment}
%
-% \begin{macro}{\raggedleft}
-% \begin{macrocode}
-\def\raggedleft{%
- \let\\\@centercr
- \rightskip\z@skip\leftskip\@flushglue
- \parindent\z@\parfillskip\z@skip}
-% \end{macrocode}
-% \end{macro}
-%
%
% \subsection{Verbatim}
%