%% %% This is file `GS_cut_EAN_control_digit.tex', %% generated with the docstrip utility. %% %% The original source files were: %% %% GS1.dtx (with options: `test,GS.cut.EAN.control.digit') %% %% EXPERIMENTAL CODE %% %% This Work depends on the correct version of expl3 release. If %% you'll update expl3 you may need a update of this this Work too. %% %% Do not distribute this file without also distributing the %% source files specified above. %% %% Do not distribute modified version of this file. %% %% File: GS1.dtx Copyright (C) 2012-2017 Markus Kohm %% %% It may be distributed and/or modified under the conditions of the %% LaTeX Project Public License (LPPL), either version 1.3c of this %% license or (at your option) any later version. The latest version %% of this license is in the file %% %% http://www.latex-project.org/lppl.txt %% %% This file is part of the "GS1 bundle" (The Work in LPPL) %% and all files in that bundle must be distributed together. %% %% The released version of this bundle is available from CTAN. %% %% ------------------------------------------------------------------------- \RequirePackage{expl3}[2017/05/29] \GetIdInfo$Id: GS1.dtx 23 2021-06-17 07:00:36Z mjk $ {GS1 code handler and barcode generator} \documentclass{article} \usepackage{GS1} \ExplSyntaxOn \msg_new:nnn { GS1/test } { function } { Something~is~wrong~with~function~#1 \msg_line_context:~~of~\c_sys_jobname_str.tex. } \ExplSyntaxOff \begin{document} \raggedright \ExplSyntaxOn \seq_new:N \l_testa_seq \GS_set_code_digit_seq:Nn \l_testa_seq {ISBN 978-3-86541-459-5} With~control:~\seq_use:Nnnn \l_testa_seq { ,~ } { ,~} { ,~ }\\ \GS_set_code_digit_seq:Nn \l_testb_seq {ISBN 978-3-86541-459} \GS_cut_EAN_control_digit:N \l_testa_seq \seq_map_inline:Nn \l_testa_seq { \seq_pop_left:NN \l_testb_seq \l_tmpa_tl \tl_set:Nn \l_tmpb_tl { #1 } \tl_if_eq:NNF \l_tmpa_tl \l_tmpb_tl { \tl_show:N \l_testa_seq \tl_show:N \l_testb_seq \msg_fatal:nnn { GS1/test } { function } { \GS_cut_EAN_control_digit:N } } } Without~control:~\seq_use:Nnnn \l_testa_seq { ,~ } { ,~} { ,~ }\\ \ExplSyntaxOff \end{document} %% %% %% End of file `GS_cut_EAN_control_digit.tex'.