protect_math: Protect math elements from commonmark's character escape

In tinkr: Cast '(R)Markdown' Files to 'XML' and Back Again

Protect math elements from commonmark's character escape

Description

Protect math elements from commonmark's character escape

Usage

protect_math(body, ns = md_ns())

Arguments

body	an XML object
ns	an XML namespace object (defaults: md_ns()).

Details

Commonmark does not know what LaTeX is and will LaTeX equations as normal text. This means that content surrounded by underscores are interpreted as ⁠<emph>⁠ elements and all backslashes are escaped by default. This function protects inline and block math elements that use $ and ⁠$$⁠ for delimiters, respectively.

Value

a copy of the modified XML object

Note

this function is also a method in the yarn object.

Examples

m <- tinkr::to_xml(system.file("extdata", "math-example.md", package = "tinkr"))
txt <- textConnection(tinkr::to_md(m))
cat(tail(readLines(txt)), sep = "\n") # broken math
close(txt)
m$body <- protect_math(m$body)
txt <- textConnection(tinkr::to_md(m))
cat(tail(readLines(txt)), sep = "\n") # fixed math
close(txt)

tinkr documentation built on March 31, 2023, 8:12 p.m.