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|
% \iffalse meta-comment
%
%% File: ltmeta.dtx
%% Copyright (C) 2021-2024
%% Frank Mittelbach, The LaTeX 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
%
%
%%% From File: ltmeta.dtx
%<*driver>
% \fi
\ProvidesFile{ltmeta.dtx}
[2024/05/16 v1.0b LaTeX Kernel (Document Metadata)]
% \iffalse
%
\documentclass{l3doc}
\GetFileInfo{ltmeta.dtx}
\EnableCrossrefs
\CodelineIndex
\begin{document}
\DocInput{ltmeta.dtx}
\end{document}
%</driver>
%
% \fi
%
% \providecommand\hook[1]{\texttt{#1}}
% \providecommand\env[1]{\texttt{#1}}
%
%
%
% \title{The \texttt{ltmeta.dtx} code\thanks{This file has version
% \fileversion\ dated \filedate, \copyright\ \LaTeX\
% Project.}}
% \author{Frank Mittelbach}
%
% \maketitle
%
%
% \begin{abstract}
% This code defines the \cs{DocumentMetadata} interface.
% \end{abstract}
%
% \tableofcontents
%
%
% \section{Introduction}
%
%
% In the past there was no dedicated location to declare settings
% concerning a document as a whole. Settings are placed somewhere
% in the preamble or with the class options or even with some
% package options. For some settings this can be too late, for
% example the pdf version can no longer be changed if a package has
% used code which already opened the PDF.
%
% \cs{DocumentMetadata} as a new command unifies such settings in
% one place. It must be used before \cs{documentclass} but can be
% issued more than once there.
%
% At the moment most of the code run by \cs{DocumentMetadata} is
% external to the format and subject to change. This includes the
% supported key/values.
%
% For that reason all that happens right now in the format is to
% look for suitable support files and if found, to redirect the
% processing to them.
%
% \subsection{\cs{DocumentMetadata}}
%
% \begin{function}{\DocumentMetadata}
% \begin{syntax}
% \cs{DocumentMetadata}\Arg{key-value list}
% \end{syntax}
% \end{function}
%
%
%
% The keys defined for \cs{DocumentMetadata}
% currently allow to set the PDF version, to set the PDF \texttt{/Lang},
% to uncompress a PDF, to set the language and to declare a few PDF standards
% and some color profiles.
%
% \cs{DocumentMetadata} is also used to
% activate the new PDF management code and it loads
% a number of required files for the PDF management code.
% As this forces the loading of the backend files, a backend
% which can't be detected automatically like |dvipdfmx|,
% must be set in the first \cs{DocumentMetadata} call (if there is more than one).
%
% The full set of keys currently supported is documented in \texttt{documentmetadata-support.pdf}
% for now.
%
%
% \StopEventually{\setlength\IndexMin{200pt} \PrintIndex }
%
%
% \section{The Implementation}
%
%
%
% \begin{macrocode}
%<*2ekernel|latexrelease>
% \end{macrocode}
% Not needed yet but \ldots
% \begin{macrocode}
%\ExplSyntaxOn
% \end{macrocode}
%
% \begin{macrocode}
%<latexrelease>\NewModuleRelease{2022/06/01}{ltmeta}
%<latexrelease> {Document Metadata handling}
% \end{macrocode}
%
% \begin{macrocode}
\let \IfDocumentMetadataTF \@secondoftwo
\protected\def\DocumentMetadata{%
\InputIfFileExists{documentmetadata-support.ltx}%
{}%
% \end{macrocode}
% The above file is changing \cs{DocumentMetadata} to a suitable
% definition (or so we hope), so that we can try again --- if not
% tough.
%
% If the file can't be found we say so and carry on without it.
% \begin{macrocode}
{%
\@latex@error{No support files for
\noexpand\DocumentMetadata found}
{Is the 'LaTeX-lab' bundle installed?%
\MessageBreak
Without it, the declaration is ignored.}%
% \end{macrocode}
% No point in trying this more than once if there are several calls
% in the document.
% \begin{macrocode}
\let\DocumentMetadata\@gobble
}%
\let \IfDocumentMetadataTF \@firstoftwo
\DocumentMetadata
}
% \end{macrocode}
%
% To allow package and class author to support for document links
% we provide also the new interface commands of the hyperref package
% for the creation of targets.
% \changes{v1.0b}{2022/05/17}{Default definition for targets added}
% \begin{macro}{\MakeLinkTarget}
% \begin{macro}{\LinkTargetOn}
% \begin{macro}{\LinkTargetOff}
% \begin{macro}{\NextLinkTarget}
% \begin{macrocode}
\NewDocumentCommand\MakeLinkTarget{sO{}m}{%
\ifvmode
\special{}%
\else
\@savsf\spacefactor
\smash{}%
\spacefactor\@savsf
\fi}
\NewDocumentCommand\LinkTargetOn{}{}
\NewDocumentCommand\LinkTargetOff{}{}
\NewDocumentCommand\NextLinkTarget{m}{}
% \end{macrocode}
% \end{macro}
% \end{macro}
% \end{macro}
% \end{macro}
%
%
% We do not undo \cs{MakeLinkTarget} and friends if we roll back, in
% case they are used in packages that themselves do not offer
% rollback. This way a roll forward adds them, but the dummies remain
% if you roll back and you don't get missing csname errors if they
% are used.
% \begin{macrocode}
%<latexrelease>\IncludeInRelease{0000/00/00}{ltmeta}%
%<latexrelease> {Undo Document Metadata handling}
%<latexrelease>
%<latexrelease>\let\DocumentMetadata\@undefined
%<latexrelease>
%<latexrelease>\EndModuleRelease
% \end{macrocode}
% Again for the future \ldots
% \begin{macrocode}
%\ExplSyntaxOff
% \end{macrocode}
% \begin{macrocode}
%</2ekernel|latexrelease>
% \end{macrocode}
%
% Restore module prefix (if any):
% \begin{macrocode}
%<@@=>
% \end{macrocode}
%
%
%
%
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\endinput
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
|
