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

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7
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1answer
712 views

A \typeout (or expandable command) that can expand once - or with variable levels of expansion?

Consider the following MWE: \documentclass[12pt]{article} \begin{document} \def\aaa{something} \typeout{=1==\aaa==} \typeout{=1==\meaning\aaa==} \typeout{} \def\bbb{else \aaa, else} ...
7
votes
1answer
289 views

Replacement for \unexpanded without eTeX extension

As comment on Can the extended register pool be used for \newinsert?, there is a reference to Dealing with tons of floats. It is interesting but uses \unexpanded: \edef\@freelist{% ...
7
votes
1answer
170 views

expansion of loop macro

I have a macro that contains a loop using \@for and it works until I try to write its output to a file. The following document shows the problem. \documentclass{article} \makeatletter ...
7
votes
1answer
94 views

Make the pattern of a \def depend on another macro

I would like to set up a macro defined something like this: \def\processline string: #1.#2\relax{\gdef\errorline{#1}} The catch is that the string should be given by the contents of another macro. ...
7
votes
1answer
309 views

Print name of command, defined by \csname

First off: I do not understand \expandafter and \noexpand completely which is probably the main problem. I have found a question that explains what it does, but still I cannot seem to make it work. I ...
7
votes
2answers
321 views

Convert string to file name and use in \href

I have a bunch of individual .tex files and want to be able to click on a link in one PDF file and have the appropriate PDF file open. These are small files, so don't really need to index into them, ...
7
votes
2answers
234 views

Hyperref to expand macro in argument

I am confused as to why the edef below does not get expanded in the link? The \GetTexFilePath is from Text being output when none should be, which is expandable, and the \GetTexFilePathOld is the ...
7
votes
1answer
451 views

Is there a robust \renewcommand replacement?

Replacing \newcommand by \DeclareRobustCommand makes a new command robust. But what about \renewcommand? Is there a command to robustly renew a command? It would be possible to first use ...
7
votes
2answers
1k views

Building labels out of counters

There is a simple version to my question, and a complex version. First, the simple version: I want to generate label names by combining a constant string with a counter's value, something like what is ...
7
votes
1answer
94 views

Define macro based on Datatool contents

I can define a macro of the form \csname../dirX Color\endcsname manually and use it as desired. However, I am unable to do the same thing based on the contents as read by the datatool package. The ...
7
votes
1answer
270 views

Defining inside an \edef

The following throws an "Undefined control sequence" error: \edef\testa{\edef\testb{foobar}\testb} when it gets to expanding \testb. This problem is also mentioned in "TEX by Topic" 12.6.2. But no ...
7
votes
1answer
47 views

expl3: \tl_put_right:Nx chokes on \{

I am trying to compose a command into a token list. \documentclass{article} \usepackage{expl3} \begin{document} \ExplSyntaxOn \tl_new:N \__a \tl_new:N \__b \tl_new:N \__c \tl_set:Nn \__a { ...
7
votes
1answer
129 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. ...
7
votes
1answer
128 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 ...
7
votes
2answers
602 views

Using \nameref within \path

Background Looking to apply a consistent style to file and directory names. The book's appendix has a subsection for every file referenced by the book. Every subsection has a label whose value is ...
7
votes
1answer
120 views

I'm confused about how expansion is happening here

I was really pleased that I could come up with a means of building the contents of a tabular environment using \foreach \x in {...} {...} structure. But I was curious about what exactly it would take ...
7
votes
1answer
78 views

Expand macro at float typesetting (not at definition) time

To my knowledge, the contents of a float environment are put into a box when the float is defined. Is it possible to proccess a user defined command/macro when the float is actually typeset, e.g. to ...
7
votes
1answer
111 views

Prevent \caption from expanding argument too early

I have a macro that defines some internal macros and does so locally as to not clutter the global namespace. However, \caption seems to expand the macro's argument too early. Here is a minimal ...
7
votes
1answer
226 views

Why do some arguments in a macro need to be preceded by \noexpand?

I keep on studying the use of nested tikzpicture environments (sorry) and I discover the next problem. I'm not sure but it sounds like a problem with "fragile" commands. Perhaps, the problem is the ...
6
votes
4answers
336 views

Signalling error in “expandable context”

I'm reviewing a few old macros of mine to make them fully expandable. One of the macros takes one argument, which should either be a two-digit or a four-digit integer (>1955). The macro then converts ...
6
votes
2answers
305 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
3answers
181 views

How to “demux” several aspects from a `\foreach` variable with `\ifstrequal`?

How can I "demux" several features from a mode specification given in a \foreach? I would like to use a \foreach to draw several nodes in a TikZ picture. The loop will specify a mode for each ...
6
votes
3answers
138 views

Expansion issue when adding to CSV list from within a \foreach

Another expansion issue that I am unable to guess at the correct combination of \edef/\expandafters to get to work. Background: Below I have defined \AddToCommaSeparateList which uses \g@addto@macro ...
6
votes
2answers
427 views

Nesting of test commands (IfStrEq, IfSubStr etc.) of xstring

The following code does not work: \documentclass{article} \usepackage{xstring} \newcommand\checkempty[1]{ \IfStrEq{#1}{}{% Empty }{% NonEmpty } } \begin{document} ...
6
votes
4answers
139 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 ...
6
votes
2answers
148 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 ...
6
votes
2answers
235 views

How to redefine commands and environments, and make them acceptable for `\write`

My general problem is the following. I want to "convert" many .tex files into some other format (xml-like). I don't want to modify the tex files, I can only build a documentclass. The texfiles are ...
6
votes
3answers
127 views

Expansion issue: How Check if options passed to an environment were used

I have an environment with portions of the content that being conditionally typeset based on options passed to the environment. The content of this environment is predefined elsewhere so depending on ...
6
votes
2answers
509 views

Expanding (edef) a lipsum command?

Just trying to debug some stuff, and I thought about 'expanding' a \lipsum[1-2] statement using \edef into a new command (that would contain the "raw" text); strangely I cannot get it to work; this ...
6
votes
4answers
135 views

How to fill a dynamically generated table with dynamic content?

how do I generate a tabular dynamically while filling it with dynamic data? Example: Let's say I have \def\N{10} and I want to generate a table with \N columns, where the top cell of each column ...
6
votes
3answers
169 views

How can I get these two nested \foreach loops to work?

I try to use nested \foreach loops to create edges between many nodes. \documentclass{standalone} \usepackage{tikz} \begin{document} \begin{tikzpicture} \node (a) at (0, 1) {}; \node (b) at (0, ...
6
votes
2answers
119 views

Use of a macro to set counter value in another macro

I am trying to simply set the value of the counter try which I defined previously to the value of the output of the \foo command. However this does not work. I guess that the problem is coming from ...
6
votes
2answers
1k views

Save current value of counter in a command

I would like to define kind of an own index, that collects certain information and one counter value - in the following small example the \addstuff-command that may get the value of a counter as its ...
6
votes
2answers
471 views

Forcing tikz/pgf to expand macros within commands

I would like to use simple macros within tikz commands, but it seems tikz doesn't expand them in the ways I would expect. For instance, the code ...
6
votes
2answers
119 views

Using an expanded macro for optional environment argument

I'd like to open an environment, passing the content of a macro to the optional arguments. Up to now I tried different approaches using \expandafter, however I could not get the expected behaviour. ...
6
votes
3answers
388 views

Expandable string substitution

I am trying to define a macro \formatstr{\mystring}{(string empty)}{the string is: #1} which expands to (string empty) when \mystring is empty (as judged, e.g. by etoolbox's \csdefempty) and ...
6
votes
1answer
261 views

Why am I processing a comma-separated list incorrectly when using etoolbox and kvoptions?

I'm trying to pick something out of a list that has been passed from some package options by kvoptions, but docsvlist doesn't appear to be recognising the commas. I suspect this may be something to ...
6
votes
2answers
551 views

Why is my macro not expanded inside of \special{…}?

I am writing my first LaTeX/TeX macro and not going anywhere with it. Could you please tell me what I am doing wrong in the code below. I have the following definitions. \def\defcolor#1#2{% ...
6
votes
1answer
452 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} ...
6
votes
3answers
124 views

reproduce section at different position

I would like to reproduce a \section at a later position, with the same number as at the original position. I tried \newsavebox{\meinebox} \savebox{\meinebox}[80mm][l]{\section{Hier}} ...
6
votes
1answer
164 views

How to extend the \romannumeral-based \fullyexpand to handle empty/all-space arguments?

In Expandable full expansion of tokens that preserves catcodes, Joseph Wright presents the following code: \long\def\fullyexpand#1{% \csname donothing\fullyexpandauxi{#1}{}% } ...
6
votes
1answer
348 views

Use \csname … \endcsname to compute the starred-version of some command

I want to define some commands declaring paired delimiters using the mathtools package in LaTeX. For example, \paren{...} should result in \left(...\right), whereas \paren[Big]{...} should give ...
6
votes
1answer
108 views

Package providing fully expandable conditionals

Is there a package providing a collection of fully expandable conditionals like this one: \newcommand\myif@num[1] {\ifnum#1\expandafter\@firstoftwo\else\expandafter\@secondoftwo\fi} Background: ...
6
votes
1answer
153 views

How can I inhibit expansion through several layers of \edef?

I'm using a macro I've defined based on some suggestions here to automate the creation of tables. For example something like \newcommand{\clearrows}{\let\matrixcontent\empty} ...
6
votes
1answer
203 views

Expansion of command for language in otherlanguage environment

I wish to keep the language in a command \newcommand{\testlang}{english} \begin{otherlanguage}{\testlang} ... \end{otherlangauge} However, \testlang is not expanded, and i get the error ! ...
6
votes
1answer
56 views

Expand package option, to make contained character math-active

In an answer to another question of mine, egreg posted code, which activates a character in math mode and gives it the function of \operatorname. Now I want to put this into a package and set the ...
6
votes
1answer
82 views

Expanding a macro as many times as possible without error

I'd like compute cosets using the permute package. Here's what I have so far: \documentclass{article} \usepackage{expl3,xparse,permute} \ExplSyntaxOn % Create a new command to compute the right ...
6
votes
1answer
126 views

Forcing macro expansion with keyval

While trying to provide an answer to this question, I've run into a stumbling block that I can't seem to get over. The listings package (like many others) uses keyval to handle configuration. What ...
6
votes
1answer
741 views

How do I examine a token?

... let me count the ways. I can test it with \if and \ifx and \show its \meaning And there I stop, both in my knowledge and my poetic ability (though some might argue that the latter never ...
6
votes
1answer
112 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: ...