28
votes
2answers
2k views

Understanding \@ifnextchar

I understand the definitions of the \makeatletter and \makeatother commands and also \def and \newcommand somewhat. But, explained in a simple way, what is happening in the following line? ...
12
votes
2answers
187 views

\if@minipage purpose in floats

In floating environments such as the captions of figures, LaTeX has a \global\@minipagefalse, why is this necessary and what does this switch do? \long\def\@makecaption#1#2{% ...
23
votes
1answer
1k views

Check if next char is {

Using \@ifnextchar one can detect if e.g. the next Character is a [, e.g.: \@ifnextchar[% { %% code to execute if [ scanned. }{ %% code to execute if [ scanned. } However, I can’t seem to ...
15
votes
3answers
399 views

What's the use of the @compatibility condition?

All of the standard LaTeX document classes (article, book and report) declare some basic functionality and parameters based on the condition @compatibility. Here's an extract from from article.cls ...
18
votes
2answers
313 views

How can I detect if I'm inside or outside of a float environment?

I am trying to detect whether I am inside or outside a float. I know the way how caption works. It uses the internal \@captype. But in the example below you see that this test failed by using ...
15
votes
1answer
462 views

What exactly does \@doendpe do?

Quoting from the LaTeX2e sources: [\@endparenv, \@doendpe] To suppress the paragraph indentation in text immediately following a paragraph-making environment, \everypar is changed to remove ...
9
votes
1answer
286 views

When is \if@nobreak set to \iftrue or \iffalse?

In my answer to a question on page breaking, I used a private switch that the user had to set by hand to prevent tables which start just after a section from breaking (at the first line). It seems ...