{parsing} is the process of analysing a string of symbols, either in natural or computer language.

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59
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Is there a BNF grammar of the TeX language?

I'm looking for a BNF grammar of the TeX language, does it exist?
11
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1answer
6k views

pgfplot: Datafile format for datetime field

I have a datafile (which I may manipulate to any format), it contains a date-time stamp currently in the form "year-month-day hour:min" and a single variable for each recorded time. When I attempt to ...
6
votes
1answer
154 views

Parsing a \$ as part of an improved \getargs command

As the author of stringstrings, I am acutely aware of its slowness. For small tasks, that slowness can be annoying. For larger tasks, it can be prohibitive. Recently, in using data column as ...
4
votes
2answers
480 views

Shell script which parses .tex files for figures

I would like to pull all figures including captions out of multiple .tex files and write them into a single new .tex file. This means I have to parse for \begin{figure} . . . \end{figure} and ...
14
votes
3answers
466 views

How could LaTeX replace the tokens <= by the command \leq?

How could LaTeX replace the tokens <= by the command \leq efficiently? Example 1: I have this code: \[ 2x <= 4x - 2 \] And I want to get after the compilation this: Example 2: \[ ...
8
votes
2answers
1k views

Iterate over space-separated list

I’ll briefly explain the background in case this can be solved simpler but I’d still be interested in an answer to the actual question, too. My chapter titles are very narrow and use a large font so ...
6
votes
2answers
175 views

Parse command argument separated by comma

I want to mix several language in my document, and the output language can be chosen according to corresponding variable I want to define this kind of command \mulan[en,fr,ru]{arg1}{arg2}{arg3} to ...
13
votes
2answers
987 views

Parsing files through LuaTeX

This question has two parts: How would one generally parse a file with LuaTeX, assuming the file only holds data that is delimited either by spaces, commas or semicolons. How would you parse the ...
13
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5answers
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How do I write a macro having comma-separated and variable number of arguments?

I want to write a macro in LaTeX2e that can pass \textcolor, which is embedded in another macro, the values of the colour model gray, rgb, or cmyk. The number of arguments specified implies the colour ...
13
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5answers
1k views

Parse comma-separated list of command names with spaces

Problem This question is related to How can I specify a long list of math operators? – but with a twist: I want to allow spaces in in the comma-separated list, like so: \newacronyms{acm, ams, cpu, ...
10
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2answers
721 views

\def taking next word as argument?

This question is a variant of my previous question requesting a macro that takes the rest of the line as argument. I would like to write a macro that would take the next word as argument, where word ...
-17
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2answers
1k views

Stringified commands to macros sequence [closed]

First, what is the proper terminology for a "string" in TeX/LaTeX that is an argument for a macro? e.g., \macro{somestring} Obviously somestring is a token, set of tokens, string, argument, etc. I ...
6
votes
1answer
147 views

Is it possible to scan until the end of the current `\item`

I do a lot of itemize lists in beamer presentation which, in a later step, I want to format nicely, for instance, typeset everything up to the first colon in boldface and the remaining part scriptsize ...
16
votes
5answers
483 views

Applying an operation only to capitals

I'd like to apply a function to capitals only so that: \emphcaps{YaWeH} Outputs like: \emph{Y}a\emph{W}e\emph{H} Preferably without using too many packages (I already use memoir). NOTES: I use ...
12
votes
5answers
549 views

Parsing hexadecimal numbers to binary and iterating over bits

I'm currently working on a software for an graphic display, so I recreated it in TikZ for documentation purposes: I currently use this to set individual pixels on the display: \setpixel{x}{y} ...
9
votes
3answers
3k views

What parsers for (La)TeX mathematics exist outside of the TeX engines?

Inspired by the author's motivation for asking Is there a BNF grammar of tex language. Are there any well done libraries that can parse some subset of TeX mathematics independently of the TeX engine? ...
19
votes
3answers
394 views

What are the effects of an empty group, {}?

In order to have a syntactic space after a no-argument command, one is taught to delimit the command token with an empty group ({}), like this: \somecommand{} more LaTeX material. However an empty ...
13
votes
4answers
1k views

Drawing Young tabloids

I would like LaTeX to produce output like the following (without the 2 a so called Young tabloid), ideally by writing \ytabloidshort{123,56} (using one character per cell, ideally allowing ...
16
votes
4answers
2k views

Syntax of TeX/LaTeX

{} and [] do some kind of grouping, and comma seems to be special as well. Being a programmer I find it frustrating to use Latex on incantation-only basis. I would like to know how does it exactly ...
13
votes
1answer
257 views

Parsing question: Do curly braces affect LaTeX compilation time?

I have an old and slow computer and long LaTeX files. When typing I prefer to use \frac 1{x} instead of \frac{1}{x} or x_i instead of x_{i}. Does the presence or omission of curly braces in these ...
9
votes
3answers
442 views

Implementing car and cdr in TeX

I've been trying to implement a macro that reads and transforms its argument into a different form...but I'm having quite a bit of trouble finding or creating even the most basic parsing tools. Case ...
5
votes
2answers
199 views

Why various syntaxes for various commands?

I understand that the standard syntax of commands in TeX is \name[optional-1]…[optional-n]{argument-1}…{argument-n} The tabular environment, however, apparently takes its optional arguments after ...
5
votes
1answer
185 views

How to skip an `\item` entirely, with no side-effects?

In Ryan Reich's great answer to my question on onlyitems, he had LaTeX ignore an \item by setting it into a box and then not using the box, effectively discarding it: ...SNIP... ...
2
votes
2answers
354 views

Time calculation for task reports

Consider this MWE: \documentclass{article} \newenvironment{dayreport}{\begin{tabular}{ll}\hline Task & Time\\\hline}{\hline\end{tabular}} \newcommand{\task}[2]{#1 & #2\\} \begin{document} ...
12
votes
3answers
1k views

Ways to parse JSON in LaTeX?

I'm writing my recipes (food) in a small textfile in JSON. Are there any ways to parse this in LaTeX? I know, that are lots of templates dealing with recipes, but I want to have my own style, which ...
10
votes
1answer
512 views

Extract the logically first slide in a Beamer overlay specification?

When writing Beamer slides for a talk, I find that I often want to have some text (usually math) visible on a group of slides and be alerted on only the first slide in the group. For example, I can ...
6
votes
1answer
346 views

Arbitrary text parsing from a separate file

I'm still very new to the world of TeX, so please bear with me if this question is unclear or has been asked before. I'm starting to figure my way through TeX and the millions of plugins and ...
6
votes
3answers
160 views

String parsing macro fails within custom cite command of biblatex?

I am trying to use the same string parsing macro as in String parsing macro fails within a minipage environment?; but this time in context of biblatex - and I'm having similar problems, I guess. ...
6
votes
4answers
759 views

Parse a string into tokens of numbers and not numbers

I have a string that I want to parse into to numbers and non-numbers. For my purposes: A Number can EITHER be any sequential string of digits OR sequential string of digits with a . followed by ...
5
votes
2answers
160 views

Parsing leading hardspaces

This question is related to (but distinct from) this question: Parsing a \$ as part of an improved \getargs command, which I asked earlier. I am experiencing a residual space in a string result from ...
5
votes
2answers
3k views

In the siunitx package, how do i get it to produce uncertainties with the \pm symbol instead of parenthesis

Using the siunitx package, if I specify an error with the \pm symbol then it automatically converts it to a form using parenthesis. I would like it to not do this and keep the \pm symbol, but still ...
5
votes
3answers
238 views

Cartesian product of two lists as parameters for a command

Friends, I used to suffer a lot when had to iterate through elements of a list, but thanks to egreg's suggestion, I've been successfully using the etoolbox package for that task, e.g.: ...
4
votes
2answers
181 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 ...
4
votes
1answer
593 views

String parsing macro fails within a minipage environment? [closed]

I am trying to work with a string parsing macro, found in the answer of TeX capacity exceeded while parsing a date string - TeX - LaTeX. Basically, I have strings num01, num02... num09 - from these, ...
3
votes
2answers
36 views

Formatting Strings in Dynamic Variables with xstring

I need to format a string resulting from a dynamic variable set in a separate program for a LaTeX generated report. In particular, if a variable has a negative value (starts with a minus sign), I ...
1
vote
1answer
95 views

Is there a BNF-grammar for simple constructs of the TeX language?

(Previously) Is there a TeX grammar that parses simple constructs like document, enumerate, section, subsection, etc.? I'm not interested in parsing complicated constructs requiring a more complex ...