NoCaseChange

base/changes.txt

@@ -6,6 +6,11 @@ completeness or accuracy and it contains some references to files that
 are not part of the distribution.
 ================================================================================
 
+2022-06-02  David Carlisle  <David.Carlisle@latex-project.org>
+
+	* ltfinal.dtx: add \NoCaseChange (previously available in the
+          textcase package)
+
 2022-05-27  David Carlisle  <David.Carlisle@latex-project.org>
 
 	* ltfiles.dtx, ltoutenc.dtx:

base/doc/ltnews35.tex

@@ -519,7 +519,7 @@ \subsection{\cs{protected} UTF-8 character definitions}
 Related to this change \cs{MakeUppercase} and \cs{MakeLowercase} have
 been updated to use the Unicode-aware case changing functions
 \cs{text\string_lowercase:n} in place of the \TeX\ primitive \cs{lowercase}.
-A similar change will be made in the \pkg{textcase} package.
+The \cs{NoCaseChange} command from the \pkg{textcase} package has also been added.
 
 Note: for technical reasons these low-level character handling changes
 will not be rolled back if the format version is rolled back using the

base/ltfinal.dtx

@@ -33,7 +33,7 @@
 %<*driver>
 % \fi
 \ProvidesFile{ltfinal.dtx}
-             [2022/04/21 v2.2t LaTeX Kernel (Final Settings)]
+             [2022/06/02 v2.2u LaTeX Kernel (Final Settings)]
 % \iffalse
 \documentclass{ltxdoc}
 \GetFileInfo{ltfinal.dtx}
@@ -273,9 +273,9 @@
 % \end{macro}
 % \end{macro}
 %
-% \begin{macro}{trace_stack_levels}
+% \begin{macro}{trace\string_stack\string_levels}
 %   Now define the Lua function to emulate \cs{tracingstacklevels} and
-%   install it in the \texttt{input_level_string} callback.
+%   install it in the |input_level_string| callback.
 %    \begin{macrocode}
 %</2ekernel>
 %<*2ekernel|latexrelease>
@@ -1064,6 +1064,7 @@
 %
 % \begin{macro}{\MakeUppercase}
 % \begin{macro}{\MakeUppercase}
+% \begin{macro}{\NoCaseChange}
 % \begin{macro}{\@uclclist}
 % \begin{macro}{\@expl@text@lowercase@@n}
 % \begin{macro}{\@expl@text@uppercase@@n}
@@ -1091,10 +1092,17 @@
 \ExplSyntaxOn
 \protected\def\@expl@text@lowercase@@n{\text_lowercase:n}
 \protected\def\@expl@text@uppercase@@n{\text_uppercase:n}
+%    \end{macrocode}
+%
+% \changes{v2.2u}{2022/06/02}{Add \cs{NoCaseChange}}
+% |\NoCaseChange| protects its argument from the case change functions.
+%    \begin{macrocode}
+\tl_put_right:Nn \l_text_case_exclude_arg_tl  { \NoCaseChange }
+\cs_new_protected:Npn \NoCaseChange #1 {#1}
 \ExplSyntaxOff
 %    \end{macrocode}
-
-%%    \begin{macrocode}
+%
+%    \begin{macrocode}
 \DeclareRobustCommand{\MakeUppercase}[1]{{%
       \def\i{I}\def\j{J}%
       \def\reserved@a##1##2{\let##1##2\reserved@a}%
@@ -1151,6 +1159,7 @@
 % \end{macro}
 % \end{macro}
 % \end{macro}
+% \end{macro}
 %
 % \changes{v1.0h}{1994/05/13}{Added output enc stuff}
 % \changes{v1.0i}{1994/05/16}{moved output enc stuff to lfonts}

base/testfiles/github-0838.lvt

@@ -0,0 +1,12 @@
+\documentclass{article}
+
+\input{test2e}
+% adding \NoCaseChange
+
+\begin{document}
+
+\sbox0{\MakeUppercase{abc \NoCaseChange{lll}xyz}}
+
+\START
+\showbox0
+\END

base/testfiles/github-0838.tlg

@@ -0,0 +1,16 @@
+This is a generated file for the LaTeX2e validation system.
+Don't change this file in any respect.
+> \box...=
+\hbox(6.94444+0.0)x54.58344
+.\OT1/cmr/m/n/10 A
+.\OT1/cmr/m/n/10 B
+.\OT1/cmr/m/n/10 C
+.\glue 3.33333 plus 1.66498 minus 1.11221
+.\OT1/cmr/m/n/10 l
+.\OT1/cmr/m/n/10 l
+.\OT1/cmr/m/n/10 l
+.\OT1/cmr/m/n/10 X
+.\OT1/cmr/m/n/10 Y
+.\OT1/cmr/m/n/10 Z
+! OK.
+l. ...\showbox0