Questions tagged [parsing]
{parsing} is the process of analysing a string of symbols, either in natural or computer language.
150
questions
2
votes
1answer
26 views
Parse standard balanced group within verbatim context
Say I want to write a custom parser which reads characters in a verbatim context, where the parser argument should be split into several kinds of tokens:
Ordinary characters, i.e. all characters ...
2
votes
2answers
124 views
Automatically remove \ifthenelse
Let's assume that you have a single LaTeX source file that can compile two arts of documents: a main conference paper and its extended long version. Inside, you use \ifthenese to produce the two ...
0
votes
0answers
30 views
Parse all equations in eps file
When I draw figures with a vector graphic program I can
export them as .eps files.
I know it is possible to use psfrag to replace given text
in the eps file with another text which is then parsed in ...
2
votes
1answer
54 views
Efficiency of xstring (2e) vs. xparse (l3) in simple parsing
I understand string processing can be done on either LaTeX2e using xstring and expl3 using xparse (originally based on the 2013 thread "Tokenizing and parsing") I will be running a relatively simple ...
4
votes
1answer
45 views
Nested maths mode - Latex parsing
I needed a tiny bullet and found this solution :
$\vcenter{\hbox{\tiny$\bullet$}}$
Howover, I don't understand how latex interpret / parse this formula.
\vcenter is math mode
\hbox and \tiny are ...
10
votes
1answer
120 views
How do I define a new TeX register with arguments in LuaTeX?
Some time ago I tried to implement the \pdfadjustinterwordglue from pdfTeX in LuaTeX using a callback. Getting the callback to work is pretty simple, but there is another major problem in the way ...
1
vote
0answers
47 views
How to iterate over tags in a latex file?
I am working on a problem where I have been given a file and I have to find all the cells in all the tables in the latex document(Basically I have to make a border for all the cells. Currently, I am ...
0
votes
0answers
44 views
Split LaTeX paragraphs into new lines after each sentence - re-formatting tool for VCS
I think this question has relevance and overlap on both stack-overflow and TeX forums, but suspect the TeX community might be better suited, so have posted it here.
My text/tex files need ...
1
vote
1answer
71 views
In what ways can one write a parser in plain TeX or packageless LaTeX?
I want to write my own document class as a literate program with as minimal of a dependency tree as possible as an exercise to test my ability.
I've implemented a stable foreach loop by shredding an ...
0
votes
1answer
44 views
How much negative space needed? To recognizably remove a space by letting something be added? For macros whose argument is another macro?
Suppose that one has brea + (notice the space at the end).
brea + is not printed yet. A macro \m{brea +} will replace + with \added ... how then does one define added, imagine it prints a d but only ...
4
votes
3answers
169 views
Extract more than nine arguments that occur periodically in a sentence to use in macros in order to typset
What is a good way to write a definition of the type \fun below
\fun{abc1 EDF1 xyz1 efg jkl abc2 EDF2 xyz2 efg jkl abc3 EDF3 xyz3 efg jkl abc4 EDF2 xyz4 ...}
where the number of arguments is not ...
1
vote
0answers
30 views
Latex3 replacement for \afterassigment in parsing code to grab integer
When parsing expressions, one way that I like to grab an integer delimited on the end by any nonexpandable token that is not a digit is using a count register and \afterassignment. So the code looks ...
3
votes
3answers
106 views
Check whether String represents valid number for PGF
I am searching for a reliable way to determine whether a String can be fed into \pgfmathprintnumber. I used to use the \IfDecimal from the xstring package which works fine for things like 3.14 and ...
1
vote
1answer
52 views
Iterating over characters of a string during a for each loop in a Tikz picture
I am trying to make a command that renders a Tikz picture in which there is a square surrounded by a number of smaller squares on the boundary. The first parameter defines the size of the picture, the ...
5
votes
2answers
843 views
Parser for pure LaTeX
Is it possible to create a parser for pure LaTeX (no plain TeX, no TeX primitive) without using any TeX engine that supports total LaTeX?
I know about an iOS app to create and typeset LaTeX and I don'...
3
votes
0answers
221 views
Is there a BNF grammar of the LaTeX format?
I know it seems like there is no BNF for TeX language.
But I am interested in BNF, PEG or any other kind of formal grammar for the LaTeX format.
Is it possible to create such a grammar for pure LaTeX ...
1
vote
1answer
68 views
Stripping leading characters from command parameter
I have a command (AlertShort) with one input parameter that both prints text and generates an index. For standard text this works fine but, in some cases, the input parameter contains a symbol which ...
1
vote
1answer
109 views
LaTeX Grammar and Nesting Rule
Is there any grammar and rule describing the allowed nestings and combinations and the allowed format of the arguments in LaTeX? E.g.
\section{\verb|mySec|}
\section{\begin{huge}mySec\end{huge}}
\...
2
votes
1answer
152 views
2
votes
1answer
79 views
Latex reformat text structure
Say I have a file of abbreivations.txt
&Estimated &Time of &Arrival
&North, &East, &West, &South
&Special &Weapons &And &Tactics
&W&ireless &F&...
8
votes
4answers
382 views
Runaway argument? with \newcommand[2]
I have a date (in the format YYYY.MM.DD) and a time (format HH:MM).
From these, I want to compute a kind of TimeStamp/Total of minutes.
\documentclass{article}
\makeatletter
% Timestamp
\...
1
vote
1answer
161 views
Runaway argument? with \def
I have a time value in the format HH:MM (i.e 03:00).
I need to compute the TotalMinutes of this time (expected result 180).
My current code is
\documentclass{article}
\makeatletter
\newcommand{\...
1
vote
1answer
104 views
Parsing function arguments and brackets
I've been trying to get a macro to work without any kind of success.
I want a function \graf{} to take a list of arguments separated by a semicolon. These arguments need to be passed to the function \...
8
votes
4answers
404 views
Check for group as argument (expandable)
I want to check whether an argument of a command is fully contained in a pair of curly braces without using any extra packages. For this I define two macros containing { and } with catcode 12, ...
11
votes
6answers
657 views
How to go about creating custom parser in Latex
Say I wanted to write a macro like this:
\makelinesegment{1:1-1:2-2:2}
And have it become something like:
\draw (1,1) -- (1,2) -- (2,2);
The question is, how to go about parsing that 1:1-1:2-2:2 ...
5
votes
1answer
161 views
Control symbol formed by escape character followed by return
Does the control symbol obtained by following the escape character by return (\<return>, catcode 0 then catcode 5) behave like the control space character (\<space>, catcode 0 then catcode ...
10
votes
2answers
407 views
When is \catcode executed?
According to the TeXbook, characters in a file are first converted to tokens with catcodes ("mouth") and then any nonexpandable commands are executed ("stomach"). \catcode is a nonexpandable command, ...
10
votes
1answer
3k views
How does “\char`” work?
In LaTeX, you can use \char` followed by a symbol to get that symbol. For example \char`b or \char`\b would just yield the letter b.
Which symbols/letters does that work for? Two ...
7
votes
1answer
430 views
How to increase minimum space between words in XeLaTex output?
Update: The problem seems to be that the spacing between some words is too small, and the ATS thinks it's one word. So, the ideal solution would be to set a minimum spacing across the entire document,...
3
votes
1answer
1k views
Load fields from JSON file using LuaLatex
I want to load a lot of numbers in my document from a single JSON file that is returned from a simulation. To do that I so far followed this stackexchange answer but for multiple values I would have ...
0
votes
0answers
124 views
Compute image ratio based on the largest picture available in the document
Following this question I asked a few years ago, I'm looking for a way to find the width of the largest picture (in width) in my document.
Typically, this requires a for loop and some TeX programming....
3
votes
1answer
153 views
Automated Code Listing Line Numbers
I want to automate source code examples in my documentation. Listing comes very close to doing this as it allows specification of start and ending line numbers:
\lstinputlisting[firstline=300,...
14
votes
2answers
661 views
What are tokens used for?
When reading TeX for the impatient, we learn that:
The "eyes" of TeX convert the input file into a sequence of characters;
Then the "mouth" of TeX converts the character sequence into tokens;
Then ...
2
votes
1answer
180 views
multi-striped nodes
I'm trying to create a pgf key that will achieve multicolored nodes with left-to-right stripes using the method outlined here.
However, I would like to provide a more convenient usage for this, ...
1
vote
1answer
154 views
Command with argument and several results inside command (inside command…)
I want to reuse a command that performs the same type of action (a specific parsing of the incoming expression) inside the other command, which should form the contents of the document and can also ...
4
votes
3answers
246 views
How do I extraxt a value from a “key1=value1,key2=value2” list?
I have a comma-separated list of key=value strings. I want to extract the value based on the key. Something a bit like
\LookUpValue{c}{a=foo,b=bar,c=baz,d=zyyzx}{error:notfound}
The intention is ...
3
votes
2answers
115 views
What causes this runaway argument when attempting to parse \jobname?
I’m attempting to parse the jobname of my (Xe)LaTeX document to set a true/false flag for later use. I came across this solution which seemed promising and which I implemented (see the following MWE).
...
5
votes
3answers
248 views
Split input at hyphen or space
I need to treat input differently, depending on whether it contains a space or a hyphen. That is, the following
\foo{foobar}
\foo{foo bar baz}
\foo{foo bar-baz}
\foo{foo-bar baz}
\foo{foo-bar-baz}
...
6
votes
1answer
716 views
Extract filename from path
For labelling purposes I want to print the filename with extension given a full file path (in \tt font)
Based on Egreg's answer in Only get filename and extension of listing, not whole path I cooked ...
7
votes
1answer
186 views
Macro overloading, catcode redefining… or how can I parse XML with TeX?
Given this code that barely parse XML and print it as SXML (s-exp XML, aka lisp-style XML, aka XML-with-parenthesis):
\catcode`@=11
\let\@xp\expandafter
\def\@makeletter#1#2\@nil{\catcode`#1 \ifx\...
4
votes
2answers
68 views
footnote inside a tested string
I would like to create a footnote within a command that tests the parent string (using xstring), such as:
\documentclass{article}
\usepackage{etex}
\usepackage{xstring}
\begin{document}
\...
12
votes
3answers
360 views
Accessing TeX token or exporting filtered plain text
(updated according to gained information)
In the context of keyword extraction from arbitrary (La)TeX documents and simple manipulations with them (automated annotation), I would like to be able to ...
3
votes
1answer
72 views
Parse macro arguments char by char and for loop through these chars
I have an idea. I want to loop through every character in string argument of macro. For example:
\def\dowithchar#1{%
% some actions with #1
}
\def\mymacro#1{%
% further pseudocode
for (every ...
1
vote
2answers
143 views
How to get paragraph contents
I have been using the following trick to obtain the contents of a paragraph. It works most of the time, but not on macros like \lipsum or \end{document} or \end{minipage} which expand the \par ...
1
vote
0answers
112 views
Problem with microtype's `\textls` and math mode [duplicate]
I have some issues with classicthesis' \spacedlowsmallcaps command that I could bring down to the following MWE:
\documentclass{scrartcl}
\usepackage{microtype}
\newcommand{\spacedword}[1]{\textls[...
7
votes
3answers
6k views
Defining \tg so it behaves exactly like \sin and \cos?
In my country, instead of tan, we use tg (this is just one of them). I want to be able to type
\tg{x}
and possibly
\tgx
So that Latex recognizes them. I tried defining them like this:
\...
2
votes
1answer
63 views
Creating a command that concatenates an input string token by token
Using (first of all) xparse I want to create a command like this:
\DeclareDocumentCommand{\c}{ s > { \SplitList { ; } } r""}
{
% do something
}
It basically should just do the following:
convert ...
2
votes
1answer
108 views
How to properly parse […]{…} with expl3?
What would be the more efficient way of parsing [...]{...} with expl3, that is to get the content inside the brackets in one variable and the content inside the braces in another one?
This question ...
3
votes
3answers
204 views
Generalized File Name Parsing
In Parse filename and extract revision from name, the OP wanted to parse a file name of the format cv3.01 to extract the revision number 3.01.
@egreg posted the following solution for a file name ...
7
votes
2answers
307 views
Parse filename and extract revision from name
My file is named 'cv3.01.tex'. I want to extract the '3.01' part and use it in the footer of the document, i.e. 'Rev 3.01'.
I found Parsing file name into document, but it does not work for my ...
