{expansion} is about expanding tokens, including the manipulation of expansion order and the suppressing of expansion.

learn more… | top users | synonyms

4
votes
2answers
152 views

Parsing rows (`\\`) and tab characters (`&`)

I have a use for parsing what would look like tabular input data, except that it isn't part of a tabular environment, but rather the argument to a macro. So I developed two macros, \readTABrow which ...
5
votes
1answer
171 views

Amsmath and tikz - conflict?

I have a problem with: \documentclass{minimal} \usepackage[T1]{fontenc} \usepackage[french]{babel} \usepackage{amsmath} \usepackage{tikz} \begin{document} \pgfmathparse{ifthenelse(1<0, ...
9
votes
2answers
102 views

How to expand \ifthenelse so that it can be used in \parshape?

How do I get the following MWE to work: \documentclass{article} \usepackage{xifthen} \usepackage{lipsum} \newboolean{bar} \setboolean{bar}{true} \def\foo{\parshape = 2 ...
8
votes
1answer
202 views

Formatting code fragments extracted from file with minted

I would like to use the catchfilebetweentags package to grab code snippets from a source file and use minted to highlight them. Imagine I have the following in program.scala: //<a def ...
3
votes
0answers
77 views

Difficulty saving formatting to a sequence to be called later in my code

I had an idea about how to answer this question and started putting some things together. I wanted to put something together that was fairly powerful and could handle simplification of linear ...
4
votes
1answer
123 views

I need a fully expandable function to expand in an “f” type argument

I really hope that I'm asking the correct question. What I'm actually working on if far more convoluted than what's happening in the MWE here. I think I've narrowed down things to real problem. I ...
5
votes
3answers
182 views

How can I remove outer brackets without expanding content?

I'm trying to use pgfkeys to collect information that will be passed to a clist. But, I'm not able to get this to work correctly. It seems that I'm getting brackets around the list and is prevent ...
6
votes
2answers
246 views

Use input inside a spreadtab environment with calculations

My aim is to create a command for inserting tables, which will format the table, and add calculations on its values, given a file containing the raw data of the rows only. ...
9
votes
3answers
156 views

Problem with ^^<HEX>

I have small problem with ^^<HEX>. If I have a <HEX> part of the ^^<HEX> in the macro \def\attemp{<HEX>}, I cannot write ^^<HEX> as ^^\attempt or ...
11
votes
1answer
193 views

expandable unit conversion

I'm writing a package to assist typesetting documents for some special Pen & Paper Fantasy RPG. In this fantasy setting, there are three types of coins: gold, silver and copper pieces, which ...
10
votes
4answers
281 views

why can't \the be expanded?

\documentclass{article} \begin{document} \tracingmacros=2 \newlength{\len} \setlength{\len}{1cm} we want to write out \verb$\len$ in cm \the\len { oops, answer in pt} \setlength{\len}{0.0352\len} ...
5
votes
1answer
85 views

newsavebox named after counter

I am trying to write a macro creting automatically a certain number of saveboxes. Therefore I would like to use the concatination of the value of a string and a counter to name the saveboxes. I tried ...
5
votes
2answers
170 views

Color Management with a Family of Curves

I am struggling with following fairly simple looking problem of plotting a family of curves. \documentclass[border=1mm]{standalone} \usepackage{pgfplotstable} \pgfplotsset{compat=1.8} ...
17
votes
2answers
461 views

How to display command name and its value

Latex displays the command values by default - I am finding it more difficult to display the command names along with the values. I have a list of commands that I would like to loop over and print ...
9
votes
1answer
240 views

Expansion inside \AtBeginDocument

I'd like to expand a macro inside \AtBeginDocument, although I guess the concrete macro does not matter. \documentclass{article} \makeatletter \@for\x:=1,2,3\do{% ...
4
votes
1answer
204 views

Are there any programs that will attempt to preprocess simple LaTeX?

I find myself in the awkward, although apparently not uncommon, position of being ordered to write, or at least end up with, documentation in the Word format. I don't have anything that fancy in my ...
6
votes
1answer
866 views

How to use \ifnum for arguments (expanding macros)?

I want to count my section's, figure's etc. using the totcount package. To get a general useable template I want to show only counters which are larger than zero. But it seems that total{counter} ...
8
votes
1answer
101 views

How do the \xx_case: functions work?

In the process of answering expl3 switch for booleans: Is there a \bool_case:Nnn?, I tried to make sense of the various \xx_case: functions Expl3 provides. Here, for example, is \tl_case:Npn: ...
8
votes
1answer
276 views

\href is not working inside \xdef

this is my first question here. I've already spent a substantial amount of time searching this before posting it here. This is my code: \documentclass[]{article} \usepackage{hyperref} ...
4
votes
2answers
116 views

Wrapper around xdef to check for conflicts

How can I write transparent wrapper around xdef that, depending on package options, report error, override or obey previous definition without sacrificing all flexibility? I have no idea how to pass ...
7
votes
3answers
154 views

Command that expands to the contents of a file

I'd like to make a macro that expands to the contents of a file. Basically something like \def{\mycommand}{\input{file.txt}} % file.txt contains "Hello%" \anothercommand{\mycommand} ...
11
votes
4answers
209 views

Partially expanding a command

My \john command is defined like so: \def\john{\DontExpandMe} I would now like to repeatedly change its definition, to keep adding some extra stuff on the front. \foreach\i in {ape,bat,cow,dog} { ...
8
votes
1answer
79 views

A proxy command for deprecation

I'm interested in defining a macro to deprecate other macros. The system on which we are working goes through a lot of refactorings and is used by more than a couple people, so we want to be able to ...
9
votes
2answers
295 views

Expansion problems with pgfkeys

I'm using pgfkeys, and a fairly adventurous syntax in which the values for some keys contain additional key/value pairs. (For instance, the value of the nodes key is a list of pairs, and the second ...
7
votes
2answers
550 views

Expand command read from file

I have a file, that contains a list of latex commands each command per line. Now I want to read this file line per line and execute/expand the macros automatically. I tried the following but this only ...
6
votes
4answers
235 views

Expansion of commands in errmessage

When I run \documentclass{article} \def\pet{dog} \errmessage{My \pet\ is {sick}} \begin{document} My \pet\ is {sick}. \end{document} the error message is: My dog\ is {sick}. but the PDF ...
10
votes
2answers
175 views

Preserving (and Controlling) Expandedness

In most cases, by the time output gets to your screen, arguments are fully expanded and my question is moot. But sometimes (verbatim being a common example), one wishes to operate on arguments with ...
19
votes
2answers
347 views

Difficulty with macro expansion

I'm not getting the output I want from my LaTeX code, and I think the problem is that I'm not expanding things at the right times. Code \documentclass{article} \usepackage{tikz} ...
7
votes
1answer
166 views

String Comparison with a \protected\def

I am using a \protected\def as that solved an earlier issue of mine. I need to compare this value of the token to see if it is initialized to the same value as the \protected\def in different ways. ...
3
votes
2answers
396 views

Undefined control sequence \pgfmath@

Why does the following code give me this error message? Error ERROR: Undefined control sequence. --- TeX said --- \pgfmath@dimen@ ...men@@ #1=0.0pt\relax \pgfmath@ l.28 \draw ...
8
votes
2answers
437 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, ...
10
votes
1answer
129 views

Expandable, very specific keyval processing

I am having a hard time trying to come up with an fully expandable keyval parsing macro which deals only with specific keys/values. I wouldn't even attempt this in full generality, that's way beyond ...
7
votes
1answer
143 views

Modified \overline over first character of complex argument

I've been using zref to handle my references. It has allowed me to customize a reference the way I want through its property lists. In particular, I reference a variety of structures in my document ...
2
votes
1answer
211 views

Cutting string with formula or cite

I am trying to define a macro that would take a string and paint its ending, for example: \def\paintString#1{% \saveexploremode% \exploregroups% \textcolor{white}{\StrGobbleRight{#1}{5}}% ...
3
votes
2answers
109 views

How to append commands to a macro without expanding them

I'm working on building an expenses package. The intention is to be able to write \expense{someone}{something}{something a bit longer}{10}{GBP} \expense{someone else }{something else}{something a bit ...
22
votes
3answers
331 views

Why the \expandafter\@firstoftwo idiom?

I see a lot of macros which are conditional tests followed by a {true}{false} pair defined so that they result in either: \expandafter\@firstoftwo or \expandafter\@secondoftwo Why are these ...
3
votes
2answers
162 views

How to use a TeX macro with a CSV list to filter an external file

The code below produces the results I desire, which is a list of the lines with XXX={<value>} with a <value> which is not one of the allowed list of values: However, this solution ...
5
votes
1answer
539 views

Preprocessing Latex: What is your workflow? Your tools?

I know, for various reason, some users preprocess their latex file using Perl or sed, say. I'm considering doing this to, so I would like to seek your guidance, to smooth my entry in this area. My ...
6
votes
2answers
194 views

Delaying command expansion that appears in \begin handler until \end handler executes

I have a custom environment for handling a code interface declaration that is specified as: \begin{decl}{FOO} \param{in}{bar} the bar input parameter \param{out}{baz} the baz input parameter ...
16
votes
2answers
2k views

Expanding arguments before macro call

I've been banging my head against this for days. I have a macro which takes a macro name and its arguments. It then re-arranges the arguments a bit and then calls the passed macro with the re-arranged ...
4
votes
2answers
130 views

List of tokens from TeX mouth

Is it possible to get list of tokens which comes from TeX "mouth"? If I understand correctly: in mouth all macros, conditionals and special operations (like \the and \input) are expanded and then goes ...
1
vote
1answer
118 views

How to expand keyval options immediately

I am trying to build up a macro that creates other macros depending on kvoptions' options. But then, the outcoming macros are dependent on the actual state of the options instead of their state at the ...
4
votes
1answer
468 views

How to use commands in table specs, and still support array package?

For a package, I want to write code that creates tables, where the exact type of table is configurable (tabular, longtable, tabularx, ... [Update: David rightly remarked that formats like tabularx ...
6
votes
1answer
510 views

At which point does \immediate\write write to file?

Assume I have opened a file myfile and write to it with \immediate\write\myfile{My cat is too old} I have multiple such statements in my document and do calculations in between which influence the ...
4
votes
0answers
280 views

\ref, \autoref and hyperref expansion [duplicate]

I'm trying to write section numbers to a file with the newfile package. In details, this MWE basically tries to write to a .ref file with lines like A-B. The A and B are generated by \label and \ref ...
10
votes
5answers
538 views

How to create a “delay expansion” environment?

I don't want to use the following \begingroup \edef\next{\endgroup \noexpand\const{Xp}{\X(tp)} \noexpand\const{Yp}{\Y(tp)} \noexpand\const{Xf}{\X(tf)} \noexpand\const{Yf}{\Y(tf)} ...
2
votes
1answer
86 views

Specify file name shell access via \@@input

Background: I need to perform a conditional branch based on the first three characters of a file. I found a rather simple solution (on a Unix system, or PC with cygwin installed): head -1 ...
14
votes
2answers
355 views

LaTeX3: How to get reliable control over the level of expansion?

Say you want to write LaTeX3 code that manages user data. Sometimes you want to process that data, but other times you just want to store it, move it around and return it unchanged (when developing a ...
15
votes
3answers
336 views

Parsing strings containing diacritical marks (macros?)

I apologize that this question may seem very much like several other recent ones I have asked (Parsing leading hardspaces, Parsing a \$ as part of an improved \getargs command). They are all related ...
6
votes
1answer
131 views

\def variables with xparse and other questions about variables

I'm writing a documentation for a REST API. So there's very much information that has to get repeated. So I'm trying to figure out a few things: Consider the following code: ...