[latex3-commits] [git/LaTeX3-latex3-latex3] master: xbox: Add \clap (dd3d9e8e5)

[Joseph Wright]

Repository : https://github.com/latex3/latex3
On branch  : master
Link       : https://github.com/latex3/latex3/commit/dd3d9e8e5280c35232b9f1129f9ca364ba9060ed

>---------------------------------------------------------------

commit dd3d9e8e5280c35232b9f1129f9ca364ba9060ed
Author: Joseph Wright <joseph.wright at morningstar2.co.uk>
Date:   Tue Aug 25 15:53:41 2020 +0100

    xbox: Add \clap


>---------------------------------------------------------------

dd3d9e8e5280c35232b9f1129f9ca364ba9060ed
 l3trial/xbox/xbox.dtx | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/l3trial/xbox/xbox.dtx b/l3trial/xbox/xbox.dtx
index 8b5265da1..e4bfb5a58 100644
--- a/l3trial/xbox/xbox.dtx
+++ b/l3trial/xbox/xbox.dtx
@@ -313,13 +313,15 @@
 %
 % \section{Plain \TeX{} commands inherited by \LaTeX{}}
 %
-% \begin{function}{\llap, \rlap}
+% \begin{function}{\clap, \llap, \rlap}
 %   \begin{syntax}
+%     \cs{clap} \Arg{content}
 %     \cs{llap} \Arg{content}
 %     \cs{rlap} \Arg{content}
 %   \end{syntax}
 %   Typesets the \meta{content} in a horizontal box of zero width such that
-%   it protrudes to the left (\cs{llap}) or right (\cs{rlap}) of the current
+%   it protrudes to the center (\cs{clap}), left (\cs{llap})
+%   or right (\cs{rlap}) of the current
 %   insertion point. The \meta{content} will overlap any other material due
 %   to the fact it is treated as having zero width.
 %   \begin{texnote}
@@ -940,6 +942,7 @@
 % \begin{macro}{\xbox_minipage_end:nn}
 % \begin{macro}{\xbox_minipage_end:nnnn}
 % \begin{macro}{\@@_minipage_end:}
+%   Most of this is setup to hand over the the same internals as \cs{parbox}.
 %    \begin{macrocode}
 \cs_new_protected:Npn \xbox_minipage_begin:n #1
   {
@@ -1467,11 +1470,16 @@
 % These are inherited from plain \TeX{}, and are therefore potentially
 % to be removed.
 %
-% \begin{macro}{\llap, \rlap}
+% \begin{macro}{\clap, \llap, \rlap}
 %   These macros place text to the left or right of the current reference point
 %   without taking up space. Unlike the plain \TeX{} versions, these correctly
 %   leave vertical mode.
 %    \begin{macrocode}
+\RenewDocumentCommand \clap { m }
+  {
+    \mode_leave_vertical:
+    \hbox_overlap_center:n  {#1}
+  }
 \RenewDocumentCommand \llap { m }
   {
     \mode_leave_vertical: