parseLatex

The goal of parseLatex is to provide a parser for a subset of LaTeX syntax that is more complete than what is handled by the tools::parseLatex() parser.

Perhaps some day it will handle all LaTeX inputs, but that’s not likely. For now, I’m aiming to handle anything that knitr::kable() and the kableExtra functions will produce, plus related code.

A website describing the current state is here: https://dmurdoch.github.io/parseLatex/ .

Installation

You can install the development version of parseLatex from GitHub with:

# install.packages("pak")
pak::pak("dmurdoch/parseLatex")

Example

This is a basic example.

library(parseLatex)
library(kableExtra)
latex <- kbl(mtcars[1:2, 1:2], format = "latex")
cat(latex)
#> 
#> \begin{tabular}[t]{l|r|r}
#> \hline
#>   & mpg & cyl\\
#> \hline
#> Mazda RX4 & 21 & 6\\
#> \hline
#> Mazda RX4 Wag & 21 & 6\\
#> \hline
#> \end{tabular}
parsed <- parseLatex(latex)
# This is a blank followed by a table; drop the blank
table <- parsed[[find_env(parsed, "tabular")]]
# Get the alignment options from the content
brace_options(get_contents(table))
#> {l|r|r}
tableCell(table, 2,2) # The title counts!
#>  21
tableCell(table, 2,2) <- "Changed!"
table
#> ENVIRONMENT: \begin{tabular}[t]{l|r|r}
#> \hline
#>   & mpg & cyl\\
#> \hline
#> Mazda RX4 & Changed! & 6\\
#> \hline
#> Mazda RX4 Wag & 21 & 6\\
#> \hline
#> \end{tabular}

To-do list

• Possibly add class for table objects, and implement indexing and subsetting on that class.
• See what kableExtra does with tables, and try to make that easier.
• Do something with math environments?