Questions tagged [expl3]
{expl3} is the programming "language" written for the LaTeX3 project. It is a library of common functions for storing and manipulating data and performing higher-level logical tasks than commonly provided for in TeX and LaTeX.
1,498
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Seeking Enhancements and Solutions for Dynamic LaTeX Command Substitution
I am engaging with the community to seek insights and possible solutions for a LaTeX macro customisation. This is inspired by a discussion in this thread, which explores the possibility of dynamically ...
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2
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2
answers
114
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Command that expands to `{ <output> }` instead of `<output>`
I'd like to define a command which expands to { <output> } instead of <output>. I've tried wrapping the command contents with additional
{ / }
\bgroup / \egroup
\begingroup / \endgroup
\...
- 1.1m
3
votes
2
answers
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expl3 — fully expand before \use:c
Consider
\def\niii{10}
\def\niiii{21}
I can easily obtain it via
\use:c {niii} % 10
\use:c {niiii} % 21
However I would like to create csname dynamically using \int_step_inline:nn {4} {i}. I tried ...
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2
votes
2
answers
113
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Understanding expansion in \addtocontents
I am confused about how expansion works in \addtocontents, or more precisely in \protected@write. As I understand it, \addtocontents should essentially expand its second argument with \protected@edef ...
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0
answers
40
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"Merge" subsequent counter-based commands
I'm trying to implement two simple paragraph numbering commands \verse and \subverse.
When a \verse command is followed by a \subverse (irrespective of spaces and new lines), only the subverse counter ...
- 11
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0
answers
50
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How do I use commands with spaces with Expl mode on?
The Problem
I want to put a command inside an xparse section so I can do a fancy little if/else option. However, the command I am issuing includes a native space inside the options: TikZ's node ...
- 427
2
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1
answer
81
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expl3 renew msg?
Using lualatex, Linux, TeXlive 2023.
When fontspec cannot find a requested font, it issues a message,
defined as follows (using expl3):
\__fontspec_msg_new:nnn {font-not-found}
{
The font "#1&...
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1
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1
answer
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Braces in l3keys
In many cases, the braces surrounding values to keys in l3keys are omitted when defining keys, even when the keys themselves have n-,c-, or e-type arguments, which normally require braced arguments. ...
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0
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1
answer
37
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Compound glossaries command with proper sub- and superscripts and custom arguments
I would like to create a macro which helps in combining gls-symbols. Each compound symbol should consist of a body and (optionally) a super and subscript (which are itself gls symbols and get listed ...
- 28.9k
1
vote
1
answer
71
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\regex_match is not working as expected
I have the following macro and the following input:
\def\something#1{
\regex_extract_all:nnN{
([A-Za-z]{1}\d{1,2})\s*-\|\s*([A-Za-z]{1}\d{1,2})
}{#1}\l_my_seq
\...
- 14.9k
7
votes
1
answer
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expl3's regex_replace_all has a problem with German ß, why?
EDIT: Solution for this problem below.
I'm trying to have an in-text direct replacement of entire words, but it seems using regex_replace_all does not work properly as it does not find a word ending ...
- 115
2
votes
1
answer
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The L3 programming layer in the LaTeX format is outdated
I'm submitting my manuscript to a journal. It required me to provide the .tex file. Everything is ok when I compile the source file on overleaf or my local texlive. But the submission system failed to ...
CommunityBot
- 1
0
votes
0
answers
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Change xeCJK without editing its source code
In xeCJK.sty there is this command:
\clist_const:Nn \c__xeCJK_CJK_chars_clist
{
"02EA -> "02EB ,
"2E80 -> "2EFF ,
"2F00 -> "2FDF ,
"2FF0 -&...
- 2,013
2
votes
1
answer
101
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Searching a list of words using Boolean operators
In the project I'm currently working on, the user can define, within an environment defined by the project, a list of tags, stored internally in a macro (for example, \tags). Each item in this list ...
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5
votes
4
answers
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Command to sum values in a list
I'm a novice to expl3. Can something list this be done?
\documentclass{article}
\usepackage{xparse}
\ExplSyntaxOn
\NewDocumentCommand{\sumlist}{m}{
\clist_add:n { #1 }
}
\ExplSyntaxOff
\begin{...
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votes
0
answers
120
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Best practices for setting package options mid-document
I am currently working on a package where the user can set the package options mid-document or within a local group. Currently, the user can do this via the user commands \set<package>keys or \...
- 1,860
2
votes
2
answers
149
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can l3keys process multiple 'submodule'?
I would like to know if I can use l3keys to process multiple submodules as pgfoption can do ?
Here is a MWE to illustrate my question:
a package file mypkg.sty (containing in comment the error I get ...
- 60.7k
4
votes
3
answers
185
views
Expl3 to simplify expansion issues with loop-built Tabularray content
A follow-on from my previous question answered thanks to @egreg. (Perhaps Prof. Gregorio would be able to help me here too.)
Situation
I am creating a Table of Questions (ToQ) macro for creating ...
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1
vote
3
answers
80
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How to pass multiple parameters to `\clist_map_function`?
I try to use a clist for the parameters for a function. One parameter, however, can contain also additional optional parameters for the function.
How can I do that?
\documentclass{article}
\...
- 60.7k
3
votes
1
answer
64
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`\str_if_eq:NcTF` does not work but `\str_case:NnTF` does?
Why is the commented code (with \str_case:NnTF) working but the code with \str_if_eq:NcTF not?
I want to overwrite the value of \l__ghs_signalword only if is not set to Gefahr...
\documentclass{...
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3
votes
2
answers
95
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Iterating over seq and using \str_case with content of seq does not work
I try to give multiple arguments to a function using a comma seperated list (clist). This seems to work and I can also iterate over the elements by using a seq. However, using the elements of the seq ...
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2
votes
2
answers
73
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LaTeX does not finish compiling (infinite loop, maybe) when I place multiple \tl_use commands inside the \bool_until_do loop
I am trying to retrieve data from a .aux file using expl3.
I want to ignore the first line because it serves a different purpose (hence the \ior_str_get:NN \l_seccion_lista_ior \l_tmpa_tl). The ...
- 28.9k
5
votes
1
answer
103
views
Font encoding affects \box_wd:N calculation
I have written a simple function to calculate the width of a line of text and display it using tikz:
\documentclass{article}
%\usepackage{mathpazo}
\usepackage{domitian}
\usepackage[T1]{fontenc}
%\let\...
- 453
2
votes
0
answers
64
views
Undefined control sequence \tl_gput_right:Ne
A user reported to me that when using the document class Q-and-A, an error of Undefined control sequence occurs:
! Undefined control sequence.
<argument> \tl_gput_right:Ne
...
- 8,528
3
votes
1
answer
131
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"Label multiply defined" with new cross-referencing properties
When recording multiple different properties (see texdoc ltproperties-doc or online) for the same label, warnings are issued. I am not able to record all properties at the same time (some must be ...
- 1,165
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1
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Trying to expand items within a newglossaryentry in a generic function without causing the Improper alphabetic constant
I've looked at both these related topics, but my situation is a little bit different.
improper alphabetic constant with-glossaries
improper alphabetic constant
The first thing I found in the ...
- 335
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2
answers
196
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Calling a Global Variable using Expl3
I've written a macro for my document that producing a random discontinuous but otherwise smooth curve, given a few randomly assigned points. I then ask what the output is for particular (not random) ...
- 1.1m
0
votes
2
answers
178
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Preserving newlines in body of \NewDocumentEnvironment when writing to an external file
I am working on a system for providing hints for exercises in a different location of the typeset document.
The current approach is based on saving the content of the hint environment to a file.
This ...
CommunityBot
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9
votes
1
answer
362
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New cs variants
In the very recent 2023-10-10 l3kernel update, (See: https://www.ctan.org/pkg/l3kernel), it looks like many new argument-specifier variants of existing control sequences were added to the kernel, ...
- 1,860
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votes
1
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90
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Test if a user command is at the end of the document
Is there any chance for a command \testcommand to test if it is the last user command before \end{document}? Since there are still hooks at enddocument, this seems a little bit tricky.
I am thinking ...
- 4,717
2
votes
1
answer
159
views
footnotes in boxes compatible with hyperref
I am trying to implement a support for \footnote in a horizontal list (boxed)
environment based on shortlst and ported (more less) to expl3. The
trick used in shortlst is taken from the tabularx ...
- 3,594
0
votes
3
answers
62
views
Defining a command that applies an inline function to each element in a list and saves the result to multiple commads
I would like to modify/extend a collection of pre-existing macros with an inline code that the user provides as an argument.
Consider we have multiple variables, for instance:
\def\mon{Monday}
\def\...
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votes
0
answers
67
views
Sort a property list (`l3prop`) by keys
How to sort a property list by keys?
There is a \clist_sort but no \prop_sort function.
My workaround is to create a clist with the keys of the property list, sort the clist, and then create a new ...
- 513
1
vote
2
answers
110
views
Access option and argument with same name
I'm trying to understand the scope of variables in latex3 and to construct an example of a function that takes an option and an argument of a command both (option and argument) having the same name.
...
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14
votes
5
answers
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Sorting a comma-separated list with LaTeX?
Is there a simple way to sort a comma separated list alphabetically in LaTeX? I tried to write a macro (\sortlist{World, Hello} → "Hello, World") using the l3sort documentation example but it ...
- 74.5k
2
votes
2
answers
360
views
How to simplify the code below by using cycles?
\documentclass{article}
\newcommand[3]{\mycounter}{a=#1, b=#2, c=#3}
\begin{document}
\mycounter{1}{2}{3}
\mycounter{4}{5}{6}
Too much… and the last line is
\mycounter{28}{29}{30}
\end{document}
I ...
- 74.5k
1
vote
1
answer
78
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expl3/xparse: expansion, comparing tokens and xparse-defined macros
What is the correct (preferred?) way to do comparisons of whether a particular token---in my examples, it's typically a single character, but it could be something like \mathcal{A} or \mathbf{b} and ...
- 759k
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1
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When should we use \cs_new...nopar?
I ask about some of the best practices for programming expl3 code.
Section 4 of interface3.pdf describes functions that define new control sequences that prohibit \par in their function parameters (#1,...
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votes
1
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expl3: peek_charcode_remove:NTF doesn't recognize \c_math_subscript_token
I have observed that the \peek_charcode:NTF and related functions do something unexpected. The functions do what I expect when the next character is ^ and I call, say,
\peek_charcode_remove:NTF \...
- 640
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votes
2
answers
146
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int_case leads to missing number problem when using multiple digits
Somehow my code breaks with Missing number, treated as zero...
\documentclass{article}
\ExplSyntaxOn
\newcommand{\Hsatz}[1]{%
\int_case:nn { #1 }{
{ 225 } { abc }
{ 319 } { def }...
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votes
1
answer
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views
Replace "\def" and "\@ifnextchar" with "expl3" code in list environment
I was trying to answer another question I asked here in the forum (How to modify the horizontal and vertical spacing between "\item" in shortenumerate (shortlst)?) regarding the shortlst ...
- 3,594
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votes
0
answers
63
views
How can I improve the coloring of macrocode envronments?
In my opinion l3 layer code readability in macrocode environments, using the doc/docstrip system can be improved by adding a bit of color to the macros. I wrote some code to do this and an example of ...
- 117k
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votes
1
answer
93
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How to use similar package and command keys, should they be separate or the same variable?
I am writing a expl3 package for typesetting amino acid residues and I am still getting to grips with LaTeX3 and the interfaces documentation. I have looked at the nicematrix annotated code for ...
- 199k
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votes
1
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Is `.code:n` still a last resort when setting LaTeX3 keys and if so, why?
I am making headway with a expl3 package I am writing, hence many questions on this subject, but I was reading an answer by @egreg to What are best practices when augmenting and building on the keys ...
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6
votes
0
answers
96
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(Corrected) updated \l_file_search_path_seq (expl3) no longer recognises `~` (TeX Live 2023 updated yesterday)
[This is an amended version of Updated \l_file_search_path_seq (expl3) no longer recognises `~` (TeX Live 2023 updated yesterday), which isn't the question I needed to ask.]
After updating TeX Live ...
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1
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Updated \l_file_search_path_seq (expl3) no longer recognises `~` (TeX Live 2023 updated yesterday)
[This question is an erroneous version of (Corrected) updated \l_file_search_path_seq (expl3) no longer recognises `~` (TeX Live 2023 updated yesterday).]
After updating TeX Live 2023 using tlmgr ...
- 199k
0
votes
0
answers
61
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Converting commands with arguments to expl3 [duplicate]
How would one convert this to expl3 version ?
\newcommand{\piston_bfblue}[1]{\textcolor{blue}{\textbf{#1}}}
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votes
1
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74
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Generating variants
Does the following command just add an additional name for the function ? Would the arguments be identical to the original function ?
\cs_generate_variant:Nn \feuds_newteorema_simple:nn { VV }
- 759k
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votes
2
answers
81
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Expl3 - Fill a tabularray in xskakloop
I would like to fill a tabularray tblr or longtblr environment using the \xskakloop command of the xskak package.
I would like to use expl3 if possible. I have tried looking into the xskak source code ...
- 328k
11
votes
1
answer
624
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How to create an active tilde in LaTeX 3
I have some LaTeX3 code that generates matrices and uses the hhline package internally. In LaTeX3 the ~ character is a special character, used for inserting spaces in strings, and using \c_tilde_str ...
