Mark character strings as raw output that should not be converted
These functions provide a mechanism to protect the character output of R code
chunks. The output is annotated with special markers in raw_output;
extract_raw_output() will extract raw output wrapped in the markers,
and replace the raw output with its MD5 digest; restore_raw_output()
will restore the MD5 digest with the original raw output.
extract_raw_output(text, markers = raw_markers) restore_raw_output(text, chunks, markers = raw_markers) raw_output(x, markers = raw_markers, ...)
text |
For |
markers |
A length-2 character vector to be used to wrap |
chunks |
A named character vector returned from
|
x |
The character vector to be protected. |
... |
Arguments to be passed to |
This mechanism is designed primarily for R Markdown pre/post-processors. In
an R code chunk, you generate raw_output() to the Markdown output. In
the pre-processor, you can extract_raw_output() from the Markdown
file, store the raw output and MD5 digests, and remove the actual raw output
from Markdown so Pandoc will never see it. In the post-processor, you can
read the Pandoc output (e.g., an HTML or RTF file), and restore the raw
output.
For extract_raw_output(), a list of two components:
value (the text with raw output replaced by MD5 digests) and
chunks (a named character vector, of which the names are MD5 digests
and values are the raw output). For restore_raw_output(), the
restored text.
library(knitr)
out = c("*hello*", raw_output("<special>content</special> *protect* me!"),
"*world*")
pre = extract_raw_output(out)
str(pre)
pre$value = gsub("[*]([^*]+)[*]", "<em>\\1</em>",
pre$value) # think this as Pandoc conversion
pre$value
# raw output was protected from the conversion (e.g.
# *protect* was not converted)
restore_raw_output(pre$value, pre$chunks)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.