% \iffalse meta-comment % %% File: latex-lab-float.dtx (C) Copyright 2023 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 % % % The development version of the bundle can be found below % % https://github.com/latex3/latex2e/required/latex-lab % % for those people who are interested or want to report an issue. % \def\ltlabfloatdate{2024-11-21} \def\ltlabfloatversion{0.81g} %<*driver> \documentclass{l3doc} \EnableCrossrefs \CodelineIndex \begin{document} \DocInput{latex-lab-float.dtx} \end{document} % % % \fi % % % \title{The \textsf{latex-lab-floats} package\\ % Tagging of floats } % \author{\LaTeX{} Project\thanks{Initial implementation done by Ulrike Fischer}} % \date{v\ltlabfloatversion\ \ltlabfloatdate} % % \maketitle % % \newcommand{\xt}[1]{\textsl{\textsf{#1}}} % \newcommand{\TODO}[1]{\textbf{[TODO:} #1\textbf{]}} % \newcommand{\docclass}{document class \marginpar{\raggedright document class % customizations}} % % \providecommand\hook[1]{\texttt{#1}} % \ProvideDocElement[printtype=\textit{plug},idxtype=plug,idxgroup=Plugs]{Plug}{plugdecl} % \ProvideDocElement[printtype=\textit{socket},idxtype=socket,idxgroup=Sockets]{Socket}{socketdecl} % % \begin{documentation} % \begin{abstract} % The following code implements a first draft for the tagging of float % environments % \end{abstract} % % % \section{Introduction} % % The code here handle the tagging of float environments. % % Figures (and tables) are in \LaTeX{} typically typeset in float environments. % These are boxes which can \emph{float} away to special float areas on the pages, % e.g., to the top or the bottom of a page or to special float pages. % If the rules allow it they can also be placed in the main text stream (\enquote{here}). % Floats can also be collected at the end of the document. % In either case the order within each type of floats % (e.g., figures, tables, algorithms, etc.) is preserved. % % A special type, called a H-float, (provided by the float package) % is always placed in the main text stream and does not % necessarily preserve the order with normal floats of the same type: It is basically % a minipage with a caption. % % Floats typically contain a figure (or a table, etc.) and a caption, % but more complex constructions with subfigures, % copyright statements, sources or additional description are possible too. % % In the \LaTeX{} source a float is normally more or less at the place of % the first call-out, but when preparing a document for print the code % is sometimes moved to place floats in a more visually pleasing way. % % \section{Tagging} % % Floats (with the exception of H-floats) do not belong into the text stream, they % are \enquote{consultation objects}: Readers must be able to choose if and when they read the float. % Floats have captions, the PDF rules require that a \texttt{Caption} is the first or last % structure in its parent structure. % This poses some challenges on a good tagging. % % In PDF~2.0 there is the suitable \texttt{Aside} tag which hopefully will % be handled correctly regarding the reading order once processor actually support % PDF~2.0. But in PDF~1.7 we rolemap it to \texttt{Note} and this doesn't lead to % a good reading order. The code therefore collects the float structures and moves % them to a \texttt{Sect} at the end of the document or the chapter % (H-floats once they are handled will not be moved). % % To fulfill the requirement that a \texttt{Caption} should be at the begin or end, we always % move it to the begin of the structure. If a float has two captions the author % has to insert a command which splits the float in two. % % Subfigures and subcaptions are currently not handled, but will be implemented % as simple \texttt{Part} with their own \texttt{Caption}. % % \section{Links} % The code disable the caption patches from hyperref. It will add an anchor at the % begin of the float or a split. It changes caption so that a link to a caption label % will go to the begin of the float. % % \section{Tools} % % The code add two keys for the \cs{tagtool} command % % % \begin{function}{flush-floats,split-float} % \begin{description} % \item[flush-floats] This will flush out the collected floats sofar (currently % table and figure. The value is a sectioning level, e.g. \texttt{section} or \texttt{chapter}, % the floats will then inserted as a \texttt{Sect} of this level (all \texttt{Sect} of smaller or equal % level are closed). The key then starts a new container for following floats. % If no value is given, the \texttt{Sect} is at the document level. The code automatically % flush all open floats at the end of the document. % % \item[split-float] This can be used inside a float if there are two captions. % It will only work reasonably well if the content of the float parts are in a sensible order % and can be separated by this command. More complex setups with tabulars will need more % thoughts. % \end{description} % \end{function} % % \section{Kernel commands} % \begin{function}{\@current@float@struct} % This variable holds the number of the current float structure. With tagging % this is the structure number, without tagging a unique counter. A float % can contain more than one float structure (e.g. if there is more than one % caption). % \end{function} % % \begin{function}{\@makecaption} % \cs{@makecaption} is defined by the classes so we overwrite it for now % at begin document. % \end{function} % % % \begin{macrocode} %<@@=tag> %<*package> % \end{macrocode} % \end{documentation} % \begin{implementation} % \section{Implementation} % \begin{macrocode} \ProvidesExplPackage {latex-lab-testphase-float} {\ltlabfloatdate} {\ltlabfloatversion} {Code related to the tagging of floats} % \end{macrocode} % \subsection{Variables} % We rolemap floats to Aside, and float sections to Sect. % % \begin{variable}{ % \g_@@_float_sect_prop, % \g_@@_float_types_seq, % \@current@float@struct, % \g_@@_float_int % } % These variables will hold the structure number for the float container % and the list of float types. Currently only figure and table are supported % TODO: interface to declare new float types. % To set the target for links we need also a unique counter. % With tagging we could use the structure number, but % the structure commands now are hidden inside tagging sockets % so we use a dedicated counter. % \begin{macrocode} \prop_new:N \g_@@_float_sect_prop \seq_new:N \g_@@_float_types_seq \seq_gput_right:Nn \g_@@_float_types_seq {figure} \seq_gput_right:Nn \g_@@_float_types_seq {table} \tl_new:N\@current@float@struct \int_new:N\g_@@_float_int % \end{macrocode} % \end{variable} % % \begin{variable}{\g_@@_float_sect_bool} % With this boolean float collection is switched on and off. % Currently it is always on and set globally. % TODO: think if an interface is needed. % TODO: would a local variable make more sense? % \begin{macrocode} \bool_new:N \g_@@_float_sect_bool \bool_gset_true:N \g_@@_float_sect_bool % \end{macrocode} % \end{variable} % % \begin{macro}{\@@_float_init:} % To be able to set unique targets for links, we % need a counter outside the tagging sockets. % TODO: check if this command should be public or % a socket or a hook. % \begin{macrocode} \cs_new_protected:Npn \@@_float_init: { \int_gincr:N \g_@@_float_int \tl_set:Ne \@current@float@struct { \int_use:N \g_@@_float_int} } % \end{macrocode} % \end{macro} % %\subsection{Moving float structures} % % Currently it is for all float types or none. % Probably we will need some more options here to select some float types. % % \begin{macro}{\@@_float_init_collect:} % This initializes a container structure for every float type. % It can be used more than once in a document, this allows to have e.g. % chapter wise containers. % \begin{macrocode} \cs_new_protected:Npn\@@_float_init_collect: { \bool_if:NT\g_@@_float_sect_bool { \seq_map_inline:Nn\g_@@_float_types_seq { \tag_struct_begin:n{tag=##1s,stash} \prop_gput:Nne\g_@@_float_sect_prop {##1-struct}{\int_use:N\c@g__tag_struct_abs_int} \tag_struct_end: } } } % \end{macrocode} % \end{macro} % % % \begin{macro}{\@@_float_stop_sect:} % This pushes out the floats. For every type is checks if there is actually % a float of this type and then writes out the container structure. % \begin{macrocode} \cs_new_protected:Npn \@@_float_stop_sect: { \bool_if:NT\g_@@_float_sect_bool { \seq_map_inline:Nn\g_@@_float_types_seq { \prop_get:NnNT\g_@@_float_sect_prop{##1-used}\l_@@_tmpa_tl { \exp_args:Ne \tag_struct_use_num:n{\prop_item:Nn\g_@@_float_sect_prop{##1-struct}} \prop_gremove:Nn \g_@@_float_sect_prop{##1-used} } } } } % \end{macrocode} % \end{macro} % \begin{macro}{flush-floats} % This is a key for \cs{tagtool} to flush out the collected floats. % The value allows to set to which level the create Sect contains. % So \texttt{section} will close all previous Sect until the section level % and create a new section. % \begin{macrocode} \keys_define:nn { tag / tool} { flush-floats .code:n = { \keys_set:nn {tag / tool} {sec-stop=#1} \@@_float_stop_sect: \@@_float_init_collect: }, flush-float .default:n = Document } % \end{macrocode} % \end{macro} % We need at least one pair % \begin{macrocode} \AddToHook{begindocument/end}[latex-lab/float] {\@@_float_init_collect:} \AddToHook{tagpdf/finish/before}[latex-lab/float] {\par\__tag_sec_end:n{-10}\@@_float_stop_sect:} \DeclareHookRule{tagpdf/finish/before}{latex-lab/float}{before}{tagpdf} % \end{macrocode} % % \subsection{Splitting floats} % \begin{macro}{split-float} % TODO: check if the target affect spacing!! % \begin{macrocode} \keys_define:nn { tag / tool} { split-float .code:n = { \UseTaggingSocket{float/end} \@@_float_init: \UseTaggingSocket{float/begin} \MakeLinkTarget*{floatstructure.\@current@float@struct} } } % \end{macrocode} % \end{macro} % % \subsection{Tagging sockets} % For now we test if the sockets are already defined % \begin{macrocode} \str_if_exist:cF { l__socket_tagsupport/float/begin_plug_str } { \NewSocket{tagsupport/float/hmode/begin}{0} \NewSocket{tagsupport/float/hmode/end}{0} \NewSocket{tagsupport/float/begin}{0} \NewSocket{tagsupport/float/end}{0} } % \end{macrocode} % % \begin{plugdecl}{default (tagsupport/float/hmode/begin)} % This plug should be used if a float is called in hmode. % In then closes the MC-chunks and starts the structure. % \begin{macrocode} \NewSocketPlug {tagsupport/float/hmode/begin}{default} { \@@_float_stop_par: } \AssignSocketPlug{tagsupport/float/hmode/begin}{default} % \end{macrocode} % \end{plugdecl} % % \begin{plugdecl}{default (tagsupport/float/hmode/end)} % This plug should be used if a float is called in hmode % and the end of the float it then restarts the MC. % \begin{macrocode} \NewSocketPlug{tagsupport/float/hmode/end}{default} { \@@_float_start_par: } \AssignSocketPlug{tagsupport/float/hmode/end}{default} % \end{macrocode} % \end{plugdecl} % % \begin{plugdecl}{default (tagsupport/float/begin)} % \begin{macrocode} \NewSocketPlug{tagsupport/float/begin}{default} { \@@_float_begin: } \AssignSocketPlug{tagsupport/float/begin}{default} % \end{macrocode} % \end{plugdecl} % % \begin{plugdecl}{default (tagsupport/float/end)} % \begin{macrocode} \NewSocketPlug{tagsupport/float/end}{default} { \@@_float_end: } \AssignSocketPlug{tagsupport/float/end}{default} % \end{macrocode} % \end{plugdecl} % % \begin{macro}{\@@_float_stop_par:,\@@_float_start_par:} % if a float is in a par, we need commands to stop and restart the P-mc % \begin{macrocode} \cs_new_protected:Npn \@@_float_stop_par: { \tag_mc_end: \bool_if:NF \g_@@_float_sect_bool { \tag_struct_end: } } \cs_new_protected:Npn \@@_float_start_par: { \bool_if:NF \g_@@_float_sect_bool { \tag_struct_begin:n{tag=text}% } \tag_mc_begin:n{tag=P} } % \end{macrocode} % \end{macro} % These commands are the main commands to start and end the float tagging. % % \begin{macrocode} \cs_new_protected:Npn \@@_float_begin: {% % \end{macrocode} % We test if the float structure should be included directly or move to a dedicated section. % \begin{macrocode} \bool_if:NTF\g_@@_float_sect_bool { \exp_args:Ne \tag_struct_begin:n{tag=float,parent=0\prop_item:No\g_@@_float_sect_prop{\@captype-struct}}% \prop_gput:Nee \g_@@_float_sect_prop {\@captype-used}{true} } { \tag_struct_begin:n{tag=float} } \tl_set:Ne\@current@float@struct{\tag_get:n{struct_num}}% \typeout{Float structure: \@current@float@struct} } \cs_new_protected:Npn\@@_float_end:{\tag_struct_end:} %end Aside % \end{macrocode} % \subsection{Patching} % This patches the main command \cs{@xfloat}. % There is a : in the code, so we disable expl3 syntax % \begin{macrocode} \ExplSyntaxOff \def\@xfloat #1[#2]{% \@nodocument \def \@captype {#1}% \def \@fps {#2}% \@onelevel@sanitize \@fps \def \reserved@b {!}% \ifx \reserved@b \@fps \@fpsadddefault \else \ifx \@fps \@empty \@fpsadddefault \fi \fi \ifhmode \@bsphack % \end{macrocode} % If the float is in hmode we have to interrupt the P % \begin{macrocode} \UseTaggingSocket{float/hmode/begin}% \@floatpenalty -\@Mii \else \@floatpenalty-\@Miii \fi \ifinner \@parmoderr\@floatpenalty\z@ \else \@next\@currbox\@freelist {% \@tempcnta \sixt@@@@n \expandafter \@tfor \expandafter \reserved@a \expandafter :\expandafter =\@fps \do {% \if \reserved@a h% \ifodd \@tempcnta \else \advance \@tempcnta \@ne \fi \else\if \reserved@a t% \@setfpsbit \tw@ \else\if \reserved@a b% \@setfpsbit 4% \else\if \reserved@a p% \@setfpsbit 8% \else\if \reserved@a !% \ifnum \@tempcnta>15 \advance\@tempcnta -\sixt@@@@n\relax \fi \else \@latex@error{Unknown float option `\reserved@a'}% {Option `\reserved@a' ignored and `p' used.}% \@setfpsbit 8% \fi\fi\fi\fi\fi }% \@tempcntb \csname ftype@\@captype \endcsname \multiply \@tempcntb \@xxxii \advance \@tempcnta \@tempcntb \global \count\@currbox \@tempcnta }% \@fltovf \fi % \end{macrocode} % This starts the structure for the float. % \begin{macrocode} \csname @@_float_init:\endcsname \UseTaggingSocket{float/begin}% \global \setbox\@currbox \color@vbox \normalcolor \vbox \bgroup \hsize\columnwidth \@parboxrestore \@floatboxreset % \end{macrocode} % We add a target for links. TODO: check that it doesn't affect spacing!! % \begin{macrocode} \MakeLinkTarget*{\@captype.struct.\@current@float@struct}% }% % \end{macrocode} % The end code of the float ... % \begin{macrocode} \def\end@float{% \@endfloatbox \UseTaggingSocket{float/end}% \ifnum\@floatpenalty <\z@ \@largefloatcheck \@cons\@currlist\@currbox \ifnum\@floatpenalty <-\@Mii \penalty -\@Miv \@tempdima\prevdepth \vbox{}% \prevdepth\@tempdima \penalty\@floatpenalty \else \vadjust{\penalty -\@Miv \vbox{}\penalty\@floatpenalty}\@Esphack \UseTaggingSocket{float/hmode/end}% \fi \fi } % \end{macrocode} % and similar for double floats: % \begin{macrocode} \def\end@dblfloat{% \if@twocolumn \@endfloatbox \UseTaggingSocket{float/end}% \ifnum\@floatpenalty <\z@ \@largefloatcheck \global\dp\@currbox1sp % \@cons\@currlist\@currbox \ifnum\@floatpenalty <-\@Mii \penalty -\@Miv \@tempdima\prevdepth \vbox{}% \prevdepth\@tempdima \penalty\@floatpenalty \else \vadjust{\penalty -\@Miv \vbox{}\penalty\@floatpenalty}\@Esphack \UseTaggingSocket{float/hmode/end}% \fi \fi \else \end@float \fi }% \ExplSyntaxOn % \end{macrocode} % % \subsection{Handling captions} % % To avoid that hyperref interferes we disable its patches: % \begin{macrocode} \def\hyper@nopatch@caption{} % \end{macrocode} % % \subsubsection{(Tagging) sockets} % % First some temporary sockets. % These sockets are in lttagging. % \begin{macrocode} \str_if_exist:cF { l__socket_tagsupport/caption/begin_plug_str } { \NewSocket{tagsupport/caption/begin}{1} \NewSocket{tagsupport/caption/end}{0} \NewSocket{tagsupport/caption/label/begin}{0} \NewSocket{tagsupport/caption/label/end}{0} } % \end{macrocode} % These socket are currently defined in tagpdf. % \changes{v0.81g}{2024-11-21}{add missing argument to socket} % \begin{macrocode} \str_if_exist:cF { l__socket_tagsupport/para/begin_plug_str } { \NewSocket{tagsupport/para/begin}{0} \NewSocket{tagsupport/para/end}{0} } % \end{macrocode} % % \begin{socketdecl}{caption/label} % This socket is a lightweight start for % some interface to format the label or add a font command. % The argument is the label text. % The default plug \texttt{kernel} adds a colon % and a space. % TODO: revisit after checking float and caption packages % to identify which sockets and hooks are needed. % \begin{macrocode} \NewSocket{caption/label}{1} % \end{macrocode} % \end{socketdecl} % % \begin{plugdecl}{kernel (caption/label)} % The standard label formatting from the kernel. % \begin{macrocode} \NewSocketPlug{caption/label}{kernel} { #1:~ } \AssignSocketPlug{caption/label}{kernel} % \end{macrocode} % \end{plugdecl} % \begin{plugdecl}{default} % The caption begin socket takes an argument: the structure number of % the parent float. If the argument is empty, the current structure is used. % TODO: a tagpdf key that moves a structure to the begin of the parent. % The caption is moved to the first position with the firstkid option. % \begin{macrocode} \NewSocketPlug {tagsupport/caption/begin}{default} { \tl_if_empty:eTF {#1} { \tag_struct_begin:n{tag=Caption,firstkid} } { \tag_struct_begin:n{tag=Caption,parent=#1,firstkid} } \bool_set_true:N \l__tag_para_flattened_bool } \AssignSocketPlug{tagsupport/caption/begin}{default} % \end{macrocode} % \end{plugdecl} % \begin{plugdecl}{default} % \begin{macrocode} \NewSocketPlug {tagsupport/caption/end}{default} { \tag_struct_end: } \AssignSocketPlug{tagsupport/caption/end}{default} % \end{macrocode} % \end{plugdecl} % % \begin{plugdecl}{default (tagsupport/caption/label/begin)} % \begin{macrocode} \NewSocketPlug {tagsupport/caption/label/begin}{default} { % \end{macrocode} % suppress para tagging at the begin. % \begin{macrocode} \tagpdfparaOff \tag_struct_begin:n{tag=Lbl} \tag_mc_begin:n{} } \AssignSocketPlug{tagsupport/caption/label/begin}{default} % \end{macrocode} % \end{plugdecl} % % \begin{plugdecl}{default (tagsupport/caption/label/end)} % \begin{macrocode} \NewSocketPlug {tagsupport/caption/label/end}{default} { \tag_mc_end: \tag_struct_end: \tagpdfparaOn } \AssignSocketPlug{tagsupport/caption/label/end}{default} % \end{macrocode} % \end{plugdecl} % % \subsubsection{Redefinitions} % % With hyperref that means that the \cs{refstepcounter} now can affect spacing so we % change that to the kernel refstepcounter: % \begin{macrocode} \def\caption{% \ifx\@captype\@undefined \@latex@error{\noexpand\caption\c_space_tl outside~float}\@ehd \expandafter\@gobble \else % \end{macrocode} % if a caption is used outside a float no % target has been set and \cs{@current@float@struct} is empty % \begin{macrocode} \tl_if_empty:NTF\@current@float@struct { \refstepcounter\@captype } { \@kernel@refstepcounter\@captype % \end{macrocode} % we need to reset the target for \cs{addcontentsline}. % We use \cs{@captype} to support autoref. % \begin{macrocode} \xdef\@currentHref{\@captype.struct.\@current@float@struct}% } \expandafter\@firstofone \fi {\@dblarg{\@caption\@captype}}% } % \end{macrocode} % % \begin{macro}{\@makecaption} % \cs{@makecaption} is defined by the classes so we overwrite it for now % at begin document. % \begin{macrocode} \AddToHook{begindocument} { \long\def\@makecaption#1#2{% \vskip\abovecaptionskip % \end{macrocode} % we don't want tagging when storing the caption for the singleline check % \begin{macrocode} \SuspendTagging{\@makecaption} \sbox\@tempboxa{#1:~#2}% \ResumeTagging{\@makecaption} % \end{macrocode} % We pass \cs{@current@float@struct} as parent structure % number. If that is empty the socket will use the parent structure and hope ... % \begin{macrocode} \UseTaggingSocket{caption/begin}{\@current@float@struct} \ifdim \wd\@tempboxa >\hsize \UseTaggingSocket{caption/label/begin} \UseSocket{caption/label}{#1} \UseTaggingSocket{caption/label/end} \UseTaggingSocket{para/begin} #2 \par \else % \end{macrocode} % we don't reuse the box as it doesn't contain tagging, but set the text explicitly. % \begin{macrocode} \global \@minipagefalse \hb@xt@\hsize{\hfil \UseTaggingSocket{caption/label/begin} \UseSocket{caption/label}{#1} \UseTaggingSocket{caption/label/end} \UseTaggingSocket{para/begin} #2 \UseTaggingSocket{para/end} \hfil}% \fi \UseTaggingSocket{caption/end} \vskip\belowcaptionskip} } % \end{macrocode} % \end{macro} % % \begin{macrocode} % % \end{macrocode} % \begin{macrocode} %<*latex-lab> \ProvidesFile{float-latex-lab-testphase.ltx} [\ltlabfloatdate\space v\ltlabfloatversion\space latex-lab wrapper float] \RequirePackage{latex-lab-testphase-float} % % \end{macrocode} % \end{implementation}