[latex3-commits] [git/LaTeX3-latex3-latex3] main: Document how to get tl head/tail with space (8ea5fe93d)
Joseph Wright
joseph.wright at morningstar2.co.uk
Mon Jun 27 08:25:52 CEST 2022
Repository : https://github.com/latex3/latex3
On branch : main
Link : https://github.com/latex3/latex3/commit/8ea5fe93d42640426a5a9f2cdc34d56c9aaf8dfa
>---------------------------------------------------------------
commit 8ea5fe93d42640426a5a9f2cdc34d56c9aaf8dfa
Author: Joseph Wright <joseph.wright at morningstar2.co.uk>
Date: Mon Jun 27 07:25:52 2022 +0100
Document how to get tl head/tail with space
This fixes #1092.
>---------------------------------------------------------------
8ea5fe93d42640426a5a9f2cdc34d56c9aaf8dfa
l3kernel/l3tl.dtx | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/l3kernel/l3tl.dtx b/l3kernel/l3tl.dtx
index 2f00437a6..d5da4a17a 100644
--- a/l3kernel/l3tl.dtx
+++ b/l3kernel/l3tl.dtx
@@ -927,6 +927,26 @@
% \end{texnote}
% \end{function}
%
+% If you wish to handle token lists where the first token may be a space, and
+% this needs to be treated as the head/tail, this can be accomplished using
+% \cs{tl_if_head_is_space:nTF}, for example
+% \begin{verbatim}
+% \exp_last_unbraced:NNo
+% \cs_new:Npn \__mypkg_gobble_space:w \c_space_tl { }
+% \cs_new:Npn \mypkg_tl_head_keep_space:n #1
+% {
+% \tl_if_head_is_space:nTF {#1}
+% { ~ }
+% { \tl_head:n {#1} }
+% }
+% \cs_new:Npn \mypkg_tl_tail_keep_space:n #1
+% {
+% \tl_if_head_is_space:nTF {#1}
+% { \exp_not:o { \__mypkg_gobble_space:w #1 } }
+% { \tl_tail:n {#1} }
+% }
+% \end{verbatim}
+%
% \subsection{Items and ranges in token lists}
%
% \begin{function}[added = 2014-07-17, EXP]
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