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

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11
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1answer
281 views

Parsing commands with multiple optional arguments

Some LaTeX commands accept multiple optional arguments. Here are some examples: \makebox[<width>][<pos>]{<text>} \framebox[<width>][<pos>]{<text>} ...
4
votes
1answer
190 views

Plain TeX macro to read a document in Pig Latin

Say I have a file eng.tex: \def\encounter (#1){Hello, #1!} \encounter (World) \bye I convert it to Pig Latin and save it as pig.tex: \efday\encounterway (#1){Ellohay, #1!} \encounterway (Orldway) ...
2
votes
0answers
68 views

How to maintain data to be both implemented and documented (in a personal package)

I'm looking for the best strategy for maintaining, in a personal package, a (long) list of data that has to be defined in the implementation and to be documented in the documentation. Let me be more ...
21
votes
5answers
427 views

How to define a command that surronds an argument with parenthesis if it contains a comma?

I have a very simple command in which one of the arguments can contain commas, in which case the output may not be easily readable since the text in which it is used may contain other commas, making ...
5
votes
2answers
209 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 ...
4
votes
2answers
235 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
79 views

Processing a particular line of text in a document

My question points actually to a particular problem, as opposed to the more general type of problem suggested in the title -- which would nevertheless be interesting to me to see answered: I'd like to ...
15
votes
3answers
557 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: \[ ...
10
votes
1answer
93 views

Scan argument for parentheses

I'd like to define a macro which expands to (#1) if #1 does not contain any parentheses, but expands to \big(#1\big) if it does. I'd choose simplicity over generality: if a solution works in the most ...
12
votes
5answers
647 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} ...
2
votes
1answer
188 views

How to check if token is a macro?

I am thinking about possibility to parse LaTeX document. What I really need is to track category codes of symbols. As I understand TeX expands all of macros in his mouth and tracks changes of category ...
9
votes
1answer
2k views

How does 'filecontents' keep LaTeX parsing while temporarily stop writing output

We all know filecontents.sty can do \documentcalss{article} \usepackage{filecontents} \begin{document} Hello World \begin{filecontents}{dummy.txt} No one will read this if I don't use it ...
8
votes
2answers
104 views

Parsing various types of page ranges with a single command

Having to treat a considerable amount of page ranges, I'd like to have a robust and simple command that would parse and print them correctly. The most simple case is e.g. 264,15-26 which ...
2
votes
2answers
2k views

How to automatically insert values into latex code/template

I'm in the process of generating an automated report in pdf from latex. Each report is the same, but has different values/graphs. The graphs is no problem, but what is the best way to process a latex ...
5
votes
2answers
164 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 ...
7
votes
4answers
225 views

How to break a line after the n-th word?

Suppose i have a raw text defined as: \newcommand{\rawtext}{this is some raw text with many words in it} How to break this line after a given word or position? Of course, i only have access to ...
6
votes
1answer
173 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 ...
1
vote
0answers
162 views

Help with verbatim-like environments [closed]

I am writing a script for LaTeX shallow parsing (assuming that there are no complicated definitions in the preamble). First of all I decided to check the document for in-line verbatims and comments, ...
20
votes
3answers
428 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 ...
8
votes
1answer
425 views

Replacing Leading Minus Signs in Environment

In this question concerning negative signs and the alignment of entries in matrix environments, Heiko Oberdiek gave a great answer in which he uses a user-defined command called \matminus instead of ...
4
votes
2answers
536 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 ...
9
votes
5answers
425 views

Parse dotted string, extracting last part

I want a macro that will separate a string like "1.2.3" into two parts: the part until the last dot (call that the context) and the last number. This seems a pretty basic application of a helper ...
10
votes
2answers
569 views

The different meanings of LaTeX's \stop command

we know that \stop will cause LaTeX to stop parsing and output what it has processed up to this command. But then I discovered another way to use it, as demonstrated in this minimum working ...
1
vote
1answer
321 views

Using \SplitArgument with r() arguments in xparse

I have been experimenting with using the xparse package for custom document macros with a Markdown-like syntax. For example, I used to write \cut{x}{P}{Q} to produce . With the help of xparse, I ...
6
votes
1answer
507 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 ...
3
votes
2answers
328 views

How to stop a block of code from being parsed?

I would like to pass some latex code to lua directly without it being parsed: \directlua{ PrintPrettyLatexCode("LATEX CODE GOES HERE!") } BUT latex tries to parse the "LATEX CODE GOES HERE!". I ...
13
votes
4answers
2k 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 ...
9
votes
3answers
497 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 ...
3
votes
1answer
158 views

pgfparser module and blank spaces

After the question Macro for a code translator, I followed the advice of polgab and used the pgf parser module. I was very disappointed when I reached the point of trying to parse a blank space. I ...
13
votes
1answer
153 views

What is considered a token for non-standard input encodings?

When I use an input encoding to (La)TeX that allows me to directly input characters such as é and ä (such as by declaring \usepackage[utf8]{inputenc}), how is a token defined? Specifically, is it ...
10
votes
1answer
542 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
3answers
164 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. ...
4
votes
1answer
653 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, ...
6
votes
1answer
157 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 ...
6
votes
1answer
259 views

Parse a file with a regexp and return first match

I need to write a command that searches a file for a string that matches a certain regexp, and inserts that string. I know how to parse a string of text using a regex with \usepackage{l3regex} ...
5
votes
3answers
831 views

How to extract parts of (La)TeX document?

I want to run queries against LaTeX documents like these: get list of all equations, even if one declares \def\be{\begin{equation}} and uses it; get list of all arguments of some command (e. g. ...
9
votes
4answers
413 views

Read command with varying input arguments

Out of curiosity I'd like to define a LaTeX command that looks like: \newcommand{\trigger}{out1,out2,...,outn} with a rather strange function (at least, I couldn't find anything like this ...
-1
votes
1answer
189 views

LPeg alternative match? [closed]

Looking over the LPeg docs I do not see a way to have alternatives(OR) http://www.inf.puc-rio.br/~roberto/lpeg e.g., a | b will match a or b. Am I missing something?
-17
votes
2answers
2k 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
4answers
863 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 ...
6
votes
4answers
538 views

List parsing with special input/optional arguments

I’d like to parse a list where the elements can be given as either [<pre>]<text>[<post>], where <pre> and <post> are optional, or (<special text>). I found a ...
16
votes
5answers
491 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 ...
4
votes
1answer
130 views

Parsing some buzzwords in the Latex document and replacing them by link possible?

Is it possible to parse teh whole document automatically, looking for buzzwords, which I will maintain in a special list, and replacing the buzzwords by links to a predefined page e.g. a glossary?
5
votes
1answer
213 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... ...
3
votes
2answers
517 views

Split long string into paragraphs

How can I test a string to see if it has more than one paragraph, and split a string that contains multiple paragraphs into two strings, one with the first paragraph of the original, one with the ...
6
votes
2answers
4k 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
1answer
996 views

Generate a parse tree for TeX

If I google for parse tree and TeX. All I'm getting are how to draw parse trees in TeX. I want to know if there are programs that can parse TeX, and output a parse tree that's easy to manipulate.
5
votes
3answers
253 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.: ...
2
votes
2answers
369 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} ...
7
votes
2answers
816 views

Formatting crystallographic indices

I would like to make a command in LaTeX that can be used like this: \zoneaxis{1 2 -3} \zoneaxis{2 -1 -1 10} and would produce this: $[1\,2\,\overline{3}]$ $[2\,\overline{1}\,\overline{1}\,10]$ ...