Questions tagged [tex-core]
{tex-core} is for questions about the core concepts of TeX, including the syntax, semantics and expected behavior of primitive control sequences, regardless of extensions (eTeX, etc.), formats (Plain or LaTeX) and macro packages (tikz). Such questions usually relate to low-level TeX programming or the behaviour of TeX at an underlying level. Note that even Plain TeX is a format in itself; for questions about it, use {plain-tex}.
2,053 questions
3
votes
1
answer
98
views
Is the use of boxes (un)limited? Using boxes instead of an outfile
In this file, I use boxes instead of an outfile. \FOXNum=1 %startbox defines the number of the first box, \lastFOXNum=10 defines the last box.
The values are optional.(1-10,20-50,1000-4000).
\...
- 177
0
votes
1
answer
173
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I want to recreate this by implementing a low lvl macro [closed]
Naturally i want this to add the next comment after it detects the next y.
My current progress is:
\documentclass{article}
\usepackage{amsmath}
\makeatletter
\newcommand{\hbrace}[1]{%
\mathop{%
\...
- 17
5
votes
1
answer
90
views
Problem with \ifx
\def\drawDSID#1#2{
\def\trP{#2}\def\rpT{R}\def\trV{\ifx{\trP}{\rpT}3\else2\fi}
\trV}
The result is always 2, irrespective of #2, eg \drawDSID{(0,-7)}{R};
- 125
5
votes
1
answer
421
views
Possible bug in TeX?
If paragraph is started implicitly and begins with a group, \everypar is executed inside group. Is it a feature?
\hsize=12em
\parindent=0pt
\everypar={\hangindent=20pt }
\indent{T}he quick brown fox ...
- 7,837
3
votes
1
answer
140
views
How to prevent `\input` from appending an extra newline at the end of a file?
I'm trying to visualize newlines in an input file by making ^^M active and displaying it as \n. However, the \input command appears to append an extra empty line at the end of the file, which I don't ...
- 157
0
votes
0
answers
34
views
How to ignore all blank lines in source code? [duplicate]
A blank line in the tex source code will leads to a paragraph break. For example,
\documentclass{amsart}
\begin{document}
This is line1.
This is line2.
This is also line2.
\end{...
- 155
4
votes
2
answers
325
views
Why is it useful to have mem_top < mem_max?
In §12 of tex.web mem_bot and mem_top are introduced.
mem_bot >= mem_min
mem_top <= mem_max
It is possible to set mem_max = mem_top and mem_min = mem_bot permanently and everything will be ...
- 7,837
5
votes
1
answer
153
views
Why does the space for hyphenation patterns differ in TEX vs INITEX?
In section 11 of tex.web it says that the space for hyphenation patterns should be larger for INITEX than it is in production
versions of TEX. Why should the space be different? And why does tex.web ...
- 7,837
3
votes
2
answers
146
views
unable to remap U+212C (ℬ) from calligraphic to script style in unicode-math
By default, the Unicode character ℬ (U+212C) is mapped to a calligraphic style letter in unicode-math.
I would like to reset it so that it instead produces a script style (curved) letter.
I tried ...
8
votes
3
answers
303
views
Why is there no expansion of a local let despite using xdef here?
In this example:
{
\let\oldpar=\par
\xdef\par{NEXT UP!\oldpar}
}
Par 1
Par 2
Par 3
\bye
TeX complains that oldpar is not defined.
I do not understand why it tries to look for a definition ...
- 174
9
votes
2
answers
428
views
What are the exact rules about spaces surrounding macro parameters/arguments?
To my surprise, the TeXbook (page 203) mentions that the first argument in
\cs AB {\Look}C${And\$ }{look}\$ 5.
where \cs is defined as
\def\cs AB#1#2C$#3\$ {#3{ab#1}#1 c##\x #2}
is \Look, and not [...
- 174
5
votes
2
answers
152
views
\futurelet with \csname
I would like to use \futurelet with two tokens defined with \csname. Here's a MWE that seems to work with no \csname (first commented line) and with one \csname for the first token (second commented ...
- 117
2
votes
1
answer
95
views
How tex engines encode file names internally on windows?
This question concerns how file names are written to the .synctex files.
On unix, these file names seem UTF8 material for any engine used.
On windows what is the exact situation for each engine (...
- 956
0
votes
2
answers
80
views
Recent change affecting line-initial whitespace
The combination of the Funnelweb literate programming tool (Ubuntu) and Latex has recently (as in last year or two) stopped working under some conditions. What happens is that the indentation ...
- 263
3
votes
1
answer
198
views
How to write exact pdf line positions, line number and page numbers to a file using Lua in LuaLaTeX?
How to get the (x, y) position of each line in the PDF output using Lua in LuaLaTeX?
I'm trying to extract the line number and the exact (x, y) position of each line in the output PDF using a Lua ...