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.
1,443
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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}
\...
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1
answer
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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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2
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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
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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 ...
5
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1
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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\...
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2
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0
answers
49
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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
...
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3
votes
1
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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 ...
- 1,133
0
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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
3
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1
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83
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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 ...
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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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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 ...
- 503
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2
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99
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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.
...
- 503
2
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1
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88
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Embed key-values in key-values using expl3
I'm trying to embed key-values in key-values in a call like the following:
\showchapter{
title=My chapter,
authors={
{name=Peter,affiliation=MIT},
{name=Mary,affiliation=UCLA},
...
- 503
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2
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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 ...
- 69
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votes
1
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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 ...
- 3,534
1
vote
1
answer
72
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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 ...
- 456
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1
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252
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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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2
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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 \...
- 456
2
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2
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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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0
answers
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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 ...
- 116k
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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 ...
- 3,534
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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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4
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1
answer
85
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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 ...
- 3,101
9
votes
1
answer
351
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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, ...
- 1,611
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0
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84
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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 ...
- 194k
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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 ...
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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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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 }
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2
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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 ...
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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 ...
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Texdoc and the various files [closed]
Have been looking at texdoc and have found
texdoc interface3
texdoc source3
One of the documents states that it is a reference manual, the other that it is a reference documentation, for the L3 ...
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Instructional example employing \cs_generate_variant:Nn [duplicate]
With \cs_generate_variant:Nn one can derive new function variants from a base variant by just giving the original, full function name (N) and the argument specifiers for the function to derive (n).
...
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Defining new functions using parameter text and using the signature [closed]
Have been reading the expl3 document interfaces3.pdf to understand how to declare and use functions. Although I have understood that there are three main methods (new, set, gset) where each method ...
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1
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84
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Expansion in precompiled l3keys
I'm having some issues with expansion in precompiled l3keys. I'd like to define a command \NewThm{<name>}[<options>] that sets the displayed theorem name to be a titlecased version of the ...
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Descriptions for n, N, V, T, F [closed]
Where can I find descriptions for n, N, V, T, F. What are they called ? Generally found after commands.
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Documentation for programmers regarding expl3
Does there exist documentation for programmers regarding Latex3 ? With details about \cs, \tl, \use, and so on ?
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1
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113
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Using lthooks to locally hook into command
Following a previous question of mine, as an exercise I'm trying to mimic the behavior of thmtools with amsthm using l3keys and lthooks. Now I am stuck on the hooks part. thmtools defines prehead, ...
- 3,460
9
votes
2
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164
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l3keys equivalent of pgfkeys' .code 2 args
What is the recommended way to emulate pgfkeys' /.code 2 args (or more generally /.code n args) handler with l3keys? For example, with pgfkeys one can do
\documentclass{article}
\usepackage{pgfkeys}
...
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Expl3 - sorting and displaying a seq in Tabularray
I want to print a sequence in a tblr environment. The \sortdata command accepts the list of integers to be sorted as well as an optional argument to specify how it should be printed out. I want to ...
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1
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Using a token list in tabularray
I am trying to expand \mydataX a tblr environment that contains a tl variable, and getting the following error: TeX capacity exceeded, sorry [input stack size=10000]. \__tl_if_novalue:w #1-NoValue-#2?#...
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Finding an int among a list of int
I'm trying to find a command or define a command that takes a list of integer and an integer and does things when the integer in in the list and does something else if it is not the case. I have seen ...
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1
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50
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Fully expand an argument of a newenvironment created with expl3
In this answer, I was provided with the following code that solves my original problem.
\ExplSyntaxOn
\NewDocumentEnvironment{withalignment}{m}
{
\begin{\vincent_alignment:n { #1 }}
}
{
\end{\...
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2
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220
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Using expl3 to load geometry parameters from a file
expl3 has defeated me again so I'm relying on the kindness of strangers again.
I think the underlying problem is more about splitting input rather than the file reading.
Context:
I want to load the ...
- 369
7
votes
2
answers
210
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Expansion issues again
I seem to keep encountering the same issue. In my attempt to learn more about expansions I have written a program that starts with a sequence of 1s and then after each step increments it to generate a ...
- 453
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votes
2
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67
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Generating tensor expression with macro
I am trying to create a command that given a comma separated list of subscript indices,
subscript values, superscript indices, superscript values and then name of the tensor generates the following ...
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votes
3
answers
164
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Generating matrices with a single command
Suppose I wanted to generate a 5x4 matrix. A good way to do it is to write the following commands:
\[
\begin{tikzpicture}
\matrix(m) [matrix of nodes, ampersand replacement=\&, row ...
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3
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Convert lines start with >> into centered text
This is actually a follow-up / the real question of this previous question.
I would like to convert text start with >> into centered text.
The motivation for this seemingly silly purpose would ...
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votes
2
answers
218
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Default units in expl3
So I have produced code, which I think is kind of a hack, but it seems to work so far in my testing.
I have setup a new expl3 function that sets a dimen variable.
If the input for the dimen expression ...
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votes
2
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42
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having trouble calling \regex_match
This works as expected:
\documentclass{minimal}
\ExplSyntaxOn
% USE X instead of \space for a space.
\catcode`\X=\active
\defX{\space }
% \mycheck:nnn <regex> <string to test against ...
- 125
1
vote
4
answers
42
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Iterate on set and use \rowcolor
I would like to generate the table contents with pure latex.
My draft is as follows:
\documentclass{article}
\usepackage{expl3}
\usepackage{colortbl}
\definecolor{lightgray}{gray}{0.9}
\ExplSyntaxOn
\...
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