diff options
Diffstat (limited to 'macros/latex-dev/required/latex-lab/latex-lab-amsmath.dtx')
-rw-r--r-- | macros/latex-dev/required/latex-lab/latex-lab-amsmath.dtx | 90 |
1 files changed, 85 insertions, 5 deletions
diff --git a/macros/latex-dev/required/latex-lab/latex-lab-amsmath.dtx b/macros/latex-dev/required/latex-lab/latex-lab-amsmath.dtx index e1f95730fa..c50a40eedd 100644 --- a/macros/latex-dev/required/latex-lab/latex-lab-amsmath.dtx +++ b/macros/latex-dev/required/latex-lab/latex-lab-amsmath.dtx @@ -2,7 +2,7 @@ % %% File: latex-lab-amsmath.dtx % -% Copyright (C) 2022,2023 The LaTeX Project +% Copyright (C) 2022-2024 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 @@ -66,7 +66,7 @@ % \subsection{File declaration} % \begin{macrocode} \ProvidesFile{latex-lab-amsmath.ltx} - [2023-01-05 v0.1a amsmath adaptions] + [2024-02-12 v0.1b amsmath adaptions] % \end{macrocode} % \subsection{Tagpdf support} % To make the code independent from tagging being loaded and active @@ -90,7 +90,11 @@ \def\intertext##1{% \ifvmode\else\\\@empty\fi \noalign{% - \penalty\postdisplaypenalty\vskip\belowdisplayskip +% \end{macrocode} +% we have to flip the sign and use a negative \cs{belowdisplayskip} +% as we flipped the sign at the outside. +% \begin{macrocode} + \penalty\postdisplaypenalty\vskip-\belowdisplayskip \vbox{ % \end{macrocode} % Stop tagging when measuring: @@ -105,9 +109,13 @@ % \begin{macrocode} \tag_mc_end_push: % \end{macrocode} -% We are already in a par so we change now to Span: +% We are already in a par so we change now to text: +% \begin{macrocode} + \tagpdfsetup{paratag=P}% +% \end{macrocode} +% TODO why \cs{tagpdfparaOn} needed? % \begin{macrocode} - \tagpdfsetup{paratag=Span}% + \tagpdfparaOn \noindent\ignorespaces##1\par % \end{macrocode} % Restart the MC @@ -119,6 +127,78 @@ } % \end{macrocode} % +% \subsection{\cs{text}} +% +% The \cs{text} command uses \cs{mathchoice} which \enquote{typesets} the argument +% four times. This makes it quite problematic for tagging. Without precautions +% structure objects would be created four times and would get MC-chunks as kids +% that doesn't really exist. amsmath contains a switch that allows to execute code +% only in the first (displaymath) branch, but that isn't usable here. At first because +% we don't know if the first branch creates the same structure as the one that is +% actually used. At second because the engines executes some commands like \cs{label} +% and \cs{pdfannot} only at shipout from the branch that really was used. So we would +% get structure data from one \cs{mathchoice}-branch and MC-labels and links from another +% one and that gets very messy. +% +% We therefore have to avoid that tagging is active in unused branches. In pdflatex it +% is not possible to detect the mathstyle before, so we use a label. With lualatex is +% is possible to redefine \cs{text} not to use \cs{mathchoice} +% +% \begin{macrocode} +\AddToHook{package/amstext/after} + { +% \end{macrocode} +% currently amsmath is loaded in a begindocument hook, so this +% test is fine. If amstext is loaded earlier (in the kernel), this needs perhaps a change. +% \begin{macrocode} + \tag_if_active:T + { + \sys_if_engine_luatex:TF + { + \def\text@#1{{% + \ifcase\mathstyle + \hbox{{#1}}\or + \hbox{{#1}}\or + \hbox{{#1}}\or + \hbox{{#1}}\or + \hbox{{\let\f@size\sf@size\selectfont#1}}\or + \hbox{{\let\f@size\sf@size\selectfont#1}}\or + \hbox{{\let\f@size\ssf@size\selectfont#1}}\or + \hbox{{\let\f@size\ssf@size\selectfont#1}}\or + \ERROR + \fi + \check@mathfonts + }} + } + { + \def\text@#1 + {{ + \int_gincr:N\g__math_mathchoice_int + \tag_stop: + \mathchoice + { + \@@_tag_if_mathstyle:en{mathchoice-\int_use:N\g__math_mathchoice_int}{0} + \textdef@\displaystyle\f@size{#1} + } + { + \@@_tag_if_mathstyle:en{mathchoice-\int_use:N\g__math_mathchoice_int}{2} + \textdef@\textstyle\f@size{\firstchoice@false #1} + } + { + \@@_tag_if_mathstyle:en{mathchoice-\int_use:N\g__math_mathchoice_int}{4} + \textdef@\textstyle\sf@size{\firstchoice@false #1} + } + { + \@@_tag_if_mathstyle:en{mathchoice-\int_use:N\g__math_mathchoice_int}{6} + \textdef@\textstyle \ssf@size{\firstchoice@false #1} + } + \check@mathfonts + }} + } + } + } +% \end{macrocode} +% % \begin{macrocode} \ExplSyntaxOff % \end{macrocode} |