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um-code-sym-commands.dtx
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um-code-sym-commands.dtx
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%%^^A%% um-code-sym-commands.dtx -- part of UNICODE-MATH <wspr.io/unicode-math>
%%^^A%% Definition of "math symbol alphabet" commands such as `\symbf` and co.
% \section{Mapping in maths alphabets}
% \label{sec:symcmd}
%
% \begin{macrocode}
%<*package>
% \end{macrocode}
%
%
% \subsection{Setting styles}
%
% Algorithm for setting alphabet fonts.
% By default, when |range| is empty, we are in \emph{implicit} mode.
% If |range| contains the name of the math alphabet, we are in \emph{explicit}
% mode and do things slightly differently.
%
% Implicit mode:
% \begin{itemize}
% \item Try and set all of the alphabet shapes.
% \item Check for the first glyph of each alphabet to detect if the font supports each
% alphabet shape.
% \item For alphabets that do exist, overwrite whatever’s already there.
% \item For alphabets that are not supported, \emph{do nothing}.
% (This includes leaving the old alphabet definition in place.)
% \end{itemize}
%
% Explicit mode:
% \begin{itemize}
% \item Only set the alphabets specified.
% \item Check for the first glyph of the alphabet to detect if the font contains
% the alphabet shape in the Unicode math plane.
% \item For Unicode math alphabets, overwrite whatever’s already there.
% \item Otherwise, use the \ascii\ glyph slots instead.
% \end{itemize}
%
%
%
% \subsection{Defining the math style macros}
%
% We call the different shapes that a math alphabet can be a `math style’.
% Note that different alphabets can exist within the same math style. E.g.,
% we call `bold’ the math style |bf| and within it there are upper and lower
% case Greek and Roman alphabets and Arabic numerals.
%
% \begin{macro}{\@@_prepare_mathstyle:n}
% \darg{math style name (e.g., \texttt{it} or \texttt{bb})}
% Define the high level math alphabet macros (\cs{mathit}, etc.) in terms of
% unicode-math definitions. Use \cs{bgroup}/\cs{egroup} so s’scripts scan the
% whole thing.
%
% The flag \cs{l_@@_mathstyle_tl} is for other applications to query the
% current math style.
% \begin{macrocode}
\@@_cs_new:Nn \@@_prepare_mathstyle:n
{
\seq_gput_right:Nn \g_@@_mathstyles_seq {#1}
\@@_init_alphabet:n {#1}
\cs_set_protected:cpx {sym#1}
{
\@@_group_begin:
\exp_not:n
{
\mode_if_math:F { \exp_args:Nc \non@alpherr {sym#1} }
\tl_set:Nn \l_@@_mathstyle_tl {#1}
}
\@@_switch_to:n {#1}
\@@_mathgroup_set:n {-1}
\@@_group_end:n
}
}
% \end{macrocode}
% \end{macro}
%
%
% \begin{macro}{\@@_init_alphabet:n}
% \darg{math alphabet name (e.g., \texttt{it} or \texttt{bb})}
% This macro initialises the macros used to set up a math alphabet.
% First used when the math alphabet macro is first defined, but then used
% later when redefining a particular maths alphabet.
% \begin{macrocode}
\@@_cs_new:Nn \@@_init_alphabet:n
{
\@@_log:nx {alph-initialise} {#1}
\tl_gclear_new:c {g_@@_switchto_#1_tl}
\cs_set_protected:cpn {@@_switchto_#1:} { \tl_use:c {g_@@_switchto_#1_tl} }
}
\cs_new_protected:Nn \@@_switch_to:n
{
\tl_use:c {g_@@_switchto_#1_tl}
}
% \end{macrocode}
% \end{macro}
%
% \subsection{Definition of alphabets and styles}
%
%
% The linking between named ranges and symbol style commands happens here.
% It’s currently not using all of the machinery we’re in the process of setting up above.
% Baby steps.
% \begin{macrocode}
\@@_cs_new:Nn \@@_default_mathalph:nnn
{
\prop_new:c {g_@@_named_range_#1_prop}
\seq_gput_right:Nn \g_@@_default_mathalph_seq {{#1}{#2}{#3}}
\prop_gput:cnn { g_@@_named_range_#1_prop } { default-alpha } {#2}
}
% \end{macrocode}
% \begin{macrocode}
\@@_default_mathalph:nnn {up } {latin,Latin,greek,Greek,num,misc} {up }
\@@_default_mathalph:nnn {it } {latin,Latin,greek,Greek,misc} {it }
\@@_default_mathalph:nnn {bb } {latin,Latin,num,misc} {bb }
\@@_default_mathalph:nnn {bbit } {misc} {bbit }
\@@_default_mathalph:nnn {scr } {latin,Latin} {scr }
\@@_default_mathalph:nnn {cal } {latin,Latin} {scr }
\@@_default_mathalph:nnn {bfcal } {latin,Latin} {bfscr }
\@@_default_mathalph:nnn {frak } {latin,Latin} {frak }
\@@_default_mathalph:nnn {tt } {latin,Latin,num} {tt }
\@@_default_mathalph:nnn {sfup } {latin,Latin,num} {sfup }
\@@_default_mathalph:nnn {sfit } {latin,Latin} {sfit }
\@@_default_mathalph:nnn {bfup } {latin,Latin,greek,Greek,num,misc} {bfup }
\@@_default_mathalph:nnn {bfit } {latin,Latin,greek,Greek,misc} {bfit }
\@@_default_mathalph:nnn {bfscr } {latin,Latin} {bfscr }
\@@_default_mathalph:nnn {bffrak} {latin,Latin} {bffrak}
\@@_default_mathalph:nnn {bfsfup} {latin,Latin,greek,Greek,num,misc} {bfsfup}
\@@_default_mathalph:nnn {bfsfit} {latin,Latin,greek,Greek,misc} {bfsfit}
% \end{macrocode}
%
% \subsubsection{Define symbol style commands}
% Finally, all of the `symbol styles’ commands are set up, which are the commands to access each of the named alphabet styles. There is not a one-to-one mapping between symbol style commands and named style ranges!
% \begin{macrocode}
\clist_map_inline:nn
{
up, it, bfup, bfit, sfup, sfit, bfsfup, bfsfit, bfsf,
tt, bb, bbit, scr, bfscr, cal, bfcal, frak, bffrak,
normal, literal, sf, bf,
}
{
\@@_prepare_mathstyle:n {#1}
}
% \end{macrocode}
%
%
% \subsubsection{New names for legacy textmath alphabet selection}
% In case a package option overwrites, say, \cs{mathbf} with \cs{symbf}.
% \begin{macrocode}
\clist_map_inline:nn
{ rm, it, bf, sf, tt }
{ \cs_set_eq:cc { mathtext #1 } { math #1 } }
% \end{macrocode}
% Perhaps these should actually be defined using a hypothetical unicode-math interface to creating new such styles. To come.
%
%
% \subsubsection{Replacing legacy pure-maths alphabets}
% The following are alphabets which do not have a math/text ambiguity.
% \begin{macrocode}
\clist_map_inline:nn
{
normal, bb , bbit, scr, bfscr, cal, bfcal, frak, bffrak, tt,
bfup, bfit, sfup, sfit, bfsfup, bfsfit, bfsf
}
{
\cs_set:cpx { math #1 } { \exp_not:c { sym #1 } }
}
% \end{macrocode}
%
%
% \subsubsection{New commands for ambiguous alphabets}
%
% \begin{macrocode}
\AtBeginDocument { \@@_setup_mathtext: }
\@@_cs_new:Nn \@@_setup_mathtext:
{
\clist_map_inline:nn
{ rm, it, bf, sf, tt }
{
\cs_set_protected:cpx { math ##1 }
{
\exp_not:n { \bool_if:NTF } \exp_not:c { g_@@_ math ##1 _text_bool}
{ \exp_not:c { mathtext ##1 } }
{ \exp_not:c { sym ##1 } }
}
}
}
% \end{macrocode}
%
% \paragraph{Alias \cs{mathrm} as legacy name for \cs{mathup}}
% \begin{macrocode}
\cs_set_protected:Npn \mathup { \mathrm }
\cs_set_protected:Npn \symrm { \symup }
% \end{macrocode}
%
%
% \begin{macrocode}
%</package>
% \end{macrocode}
\endinput
% /©
%
% ------------------------------------------------
% The UNICODE-MATH package <wspr.io/unicode-math>
% ------------------------------------------------
% This package is free software and may be redistributed and/or modified under
% the conditions of the LaTeX Project Public License, version 1.3c or higher
% (your choice): <http://www.latex-project.org/lppl/>.
% ------------------------------------------------
% Copyright 2006-2019 Will Robertson, LPPL "maintainer"
% Copyright 2010-2017 Philipp Stephani
% Copyright 2011-2017 Joseph Wright
% Copyright 2012-2015 Khaled Hosny
% ------------------------------------------------
%
% ©/