A high-level package from the LaTeX3 project that provides a powerful mechanism for defining new commands with various types of arguments.

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38
votes
2answers
659 views

How “safe” is it to use LaTeX3 (l3packages, l3kernel)?

Are l3kernel and l3packages present in most of the LaTeX distributions? Are they "stable enough"? I am asking this because I am preparing a .tex document for a client. I have found convenient to use ...
22
votes
2answers
580 views

Sum of finite series using LaTeX 3

Is it possible to calculate the value of a finite series, say, using LaTeX 3?
16
votes
3answers
283 views

Defining Extensible macros

Question: For a macro that has only one parameter, are there any issues with defining it as follows: \NewDocumentCommand{\MyMacro}{% s% #1 = starred variant (*** unused as of yet ...
16
votes
3answers
1k views

Latex dynamic macro definition

I am trying to dynamically define variables. What I want to do is be able to define a person in the following way \definePerson{MrTestKey}{Mr Test}{0400 000 000}{mr@test.com} and then subsequently ...
14
votes
1answer
1k views

How to transpose a table in expl3

I've been very impressed with xparse and expl3, and have written a wonderful document command using \ProcessList that takes a comma separated list and turns it into a (basically) 1 column table. ...
13
votes
1answer
740 views

Suppress xparse message “Redefining document command”

I am trying to suppress messages of the form: ************************************************* * LaTeX warning: "xparse/redefine-command" * * Redefining document command \MyMacro with arg. spec. ...
12
votes
1answer
306 views

Text being output when none should be

I am confused as to why the MWE below produces any black text. As the code is below, the output is: However, if you comment out the \IfStrEq line then it works fine and the black text goes away? ...
11
votes
2answers
235 views

Changing \newcommand into xparse \NewDocumentCommand

I would like to change the \newcommand \shcpoint into an xparse \NewDocumentCommand. How can I achieve this? \newcounter{totalpoints} \regtotcounter{totalpoints} \newcommand{\shcpoint}[1]{% ...
11
votes
3answers
171 views

Use a macro to define a \NewDocumentCommand macro without backslash

Or as, Werner simplified it: "How to define a command without backslash in xparse". Background: I am trying to set up a macro to define a macro for me (which will also do some other things which ...
10
votes
2answers
360 views

How do I pass an expanded optional argument using expl3/xparse?

I have a command defined using xparse syntax: \DeclareDocumentCommand \foo { O{} m } {} Inside some other command (say, \bar), I want to call this command. The calling command (\bar) has to ...
10
votes
2answers
781 views

Why using a backslash in command definitions?

I want to know the reasoning behind the (La)TeX inferface for defining commands with leading backslashes. I see why a backslash has to be used to call (expand) a command (macro), but I do not ...
10
votes
2answers
163 views

Is it possible to use \index{\command} inside a \DeclareDocumentCommand?

So I've been writing a book of sorts where I've used xparse to create some commands and environments. Now, when the thing is almost done, I realised a index would be great to have! One of the ...
10
votes
1answer
169 views

Processing a sequence of pairs

I want to process a list of pairs like this: {{a1,b1},{a2,b2},{a3,b3}} where the first items in each pairs are distinct. So, for each pair of those {ai,bi} I would need the following data: ...
10
votes
1answer
136 views

What are best practices when augmenting and building on the keys provided by someone else's package

The situation is one where I'm developing my own commands and environments which build on the commands and environments provided by another package: for ease of talking let's call this other package ...
10
votes
1answer
118 views

Collecting environment content with support for xparse arguments

I'm trying to create an environment which uses xparse style arguments but I have to be able to use the whole environment content in the environment definition, e.g. as an argument. Ideally I'd like ...
9
votes
3answers
177 views

Test whether last letter of a string is upper case or not

I would like to define a command that will behave according to the nature of the last character fed it. But I'm having difficulty just getting the components of my command to work. I thought I could ...
9
votes
2answers
183 views

Workaround how to use expl3 functionality in tikz

What I want to do I want to create a command \planfigur{<edges>}{<angles>} which draws a triangle using TikZ. \planfigur should have 2 mandatory arguments, which let me specify edges ...
9
votes
2answers
230 views

recursive multiple subscript and superscript with xparse

How can I define a new command with xparse, something like this: \NewDocumentCommand\tensorkor{ m >{\SplitList{,}}o >{\SplitList{,}}o } { ????? } that i can execute $ ...
9
votes
2answers
2k views

xparse: Define new command with multiple optional parameters

I'd like to define a new command with optional parameters using the xparse package. Please consider the following example: \documentclass{minimal} \usepackage{xparse} ...
9
votes
1answer
172 views

Using an array environment inside an xparse command

I would like to define a macro for optimization problems. My attempt is given below. I am wondering why \optimizationproblema works, but \optimizationproblemb does not (I get a "misplaced alignment ...
9
votes
1answer
554 views

Wrapping \cmidrule in a macro

In my earlier solution for Multivariate polynomial long division using LaTeX I had wrapped \cmidrule in a macro as its syntax alowing to shorten the end points was not standard: ...
9
votes
1answer
624 views

Use the s (star) argument with \NewDocumentEnvironment

Would it be possible to use the s argument specifier of xparse in \NewDocumentEnvironment so that we get an environment an a starred version of it? Actually it works, but the star goes to the wrong ...
9
votes
1answer
202 views

Optional arguments: xparse vs. xargs

To implement a macro that takes one or more optional arguments that do not have to be placed in the first position, xargs can be used as well as xparse. The latter seems to have more recent updates ...
8
votes
2answers
542 views

xparse and key value arguments

I'm trying to learn how to do macros. I want to use xparse as it seems the most powerful tool. I also want named arguments, as numbered arguments make me, as a programmer, uncomfortable. I had some ...
8
votes
2answers
245 views

Automating table creation

I have the following table that I need to recreate quite a few times Due to its size and complexity (yes, I am a tex novice) I am looking into ways of automating the creation of said table. I try ...
8
votes
2answers
542 views

Package xparse \SplitList last token

I need to create a macro to render lists with a variable number of arguments (1+), e.g. \mylist{1,2,3} should expand to $\tilde{1}$--$\tilde{2}$--$\tilde{3}$. I'm trying to use xparse and \SplitList, ...
8
votes
4answers
312 views

Greek `\chi`'s subscript expressions: how to make it smaller or offset lower?

I am unsatisfied with the way subscript is rendered for the Greek letter \chi. This particular letter is rendered with a small downward offset. I occasionally have to prefix the subscript with ...
8
votes
1answer
72 views

xparse's \DeclareDocumentEnvironment gives error on already-defined environment

I'm trying to redefine an existing environment subfigure defined by the subcaption package. To do this, I'm using xparse's DeclareDocumentEnvironment since that's suppose to declare a new environment ...
8
votes
1answer
96 views

SplitArgument on colon doesn't work under expl3 syntax

\documentclass{article} \usepackage{xparse} \DeclareDocumentCommand\TestA{>{\SplitArgument{1}{:}}m}{% \Example #1 } \ExplSyntaxOn \DeclareDocumentCommand\TestB{>{\SplitArgument{1}{:}}m}{ ...
8
votes
1answer
183 views

On pitfalls of robust commands

These days, I’m more and more defining robust commands, e.g., using \newrobustcmd (etoolbox package) or \NewDocumentCommand (xparse package). Robust commands seem advantageous to me in many respects ...
8
votes
1answer
179 views

TikZ path doesn't work with xparse generated macro

I am trying to use TikZ together with a macro that I defined via \NewDocumentCommand (for multiple optional arguments), but it doesn't behave as expected. TikZ is giving up on the path instead of ...
8
votes
1answer
134 views

Can I temporarily supress xparse's log messages?

I know that I can suppress all those annoying xparse logging messages about redefining commands using the log-declarations=false package option. I find that I can do this after xparse has been loaded ...
7
votes
3answers
557 views

Defining 3*(2^4) complex macro at once

An Automata can be 1- or 2- ways, With Several Heads or a Single head Deterministic or Non-deterministic With a stack or not That makes 2^4 = 16 possibilities. However, for each combination, I'd ...
7
votes
4answers
183 views

How can I capture both superscripts and subscripts after a macro

This question piggy-backs on the answer to Capture a macro's subscripts/superscripts by the macro by egreg. I'm attempting to use the xparse package to create some macros and I'd rather not have ...
7
votes
2answers
895 views

New command and the corresponding star counterpart with xparse

The following works as expected: \newcommand{\engl}[2]{#1 (en. \textsl{#2})\index{en-ro}{#2}} However, what I want to achieve would be a * version of it which only adds to the indices, without the ...
7
votes
3answers
690 views

xparse empty arguments

I have defined a command using xparse as \DeclareDocumentCommand\mymacro{o o o} and I want to call it with various numbers of arguments (up to 3) \mymacro, \mymacro[test][two], \mymacro[][][test] ...
7
votes
2answers
379 views

How can I create an oddly-delimited macro, using xparse?

I have a partial version of this macro working, without xparse, but I needed to tweak it and it got too unwieldy, so I'm trying to use xparse instead. It's admittedly a farfetched macro, but I'm ...
7
votes
2answers
129 views

Redefine \newcommand to insert code at start and end of custom macros

I would like to be able to insert code into the definitions of my custom macros, without having to modify each macro definition. This seemed like a simple case of redefining \newcommand, but this ...
7
votes
1answer
167 views

NewDocumentCommand-defined command in bookmark

I have a scenario where xparse's \NewDocumentCommand has a regression compared to any alternative I know, including ones defining robust commands. So I'm avoiding \NewDocumentCommand in this case, but ...
7
votes
1answer
196 views

Removing strange vertical space after first (customized) \item

I have a custom environment properties (that is almost ready for release to Github) that works like so: \begin{properties} \item[no max in reals] \forall a \in \Re, \exists b \in \Re : a < b ...
7
votes
1answer
105 views

Filling a table by iterating over a sequence produces an orphan cell

I'm trying to fill a table with content that is stored in a sequence by a custom command. \documentclass{article} \usepackage{xparse} \usepackage{expl3} \ExplSyntaxOn \seq_new:N \my_sequence ...
6
votes
2answers
197 views

Define a New Macro via a Macro Using xparse Syntax

I am trying to set up a macro that defines a macro that is to be executed only once. With what I learned from Define a Macro via Macro if Given Macro is not defined I can do that via the ...
6
votes
3answers
545 views

\NewDocumentCommand with constructed csname

In the spirit of my previous questions Defining \xthinspace: Thin space only if not followed by certain characters and Ellipses & Correct Space Factor, I’m trying to define a generic \xspace-like ...
6
votes
1answer
344 views

Color each letter in document

I am trying to define a command that changes the color of every letter in the whole document to a specified color. I already tried different approaches from this thread, but I was not able to color ...
6
votes
1answer
153 views

What is the difference between \NewDocumentCommand and \DeclareDocumentCommand?

These commands are part of the LaTeX3 Project xparsepackage. This question is to satisfy curiosity… From xparse documentation released on 25 Nov 2014: \DeclareDocumentCommand will always create ...
6
votes
1answer
202 views

\edef in LaTeX 3?

Is there a version of \DeclareDocumentCommand (in LaTeX 3) which performs like \edef? I.e. where the argument is evaluated at the time of definition as opposed to the time the macro is called? For ...
6
votes
3answers
168 views

Define a \dots-aware command

edit: changed the MWE to show the problem with french babel So, I was wondering about in TeX.sx and came upon this question How do magic \dots work in amsmath?, I wanted to do the same thing (have a ...
6
votes
1answer
127 views

Different result using \newcommand and \NewDocumentCommand

I am writing a text which references a whole bunch of Brazilian norms. All of these norms are prefixed with "NBR". I therefore created the following command \newcommand*{\NBR}[1]{NBR #1\cite{NBR#1}} ...
6
votes
1answer
91 views

Behavior of xparse and “token”-type argument

Please consider the following example: \documentclass{minimal} \usepackage{xparse} \NewDocumentCommand{\f}{tx}{\IfBooleanTF{#1}{true}{false}} \begin{document} \f{x} \f[x] \f x \end{document} ...
6
votes
1answer
1k views

How to convert to odt using xparse and mk4ht oolatex

Both tex4ht and htlatex compile documents with package xparse. But mk4ht oolatex doesn't. Running it on a document as simple as: \documentclass{article} \usepackage{xparse} \begin{document} a ...