String and byte representations for all kinds of R objects.
This package exists to reliably create readable text (and viewable image) representations of data without the side effects
print() can cause, such as invoking a pager and plotting to a plot device. In other words, all repr functions and methods are pure.
It is intended to be the basis of several packages that need to create rich text and graphics from R objects, such as Jupyter’s IRkernel, knitr, and others, such as a future more powerful replacement for
R CMD Rd2pdf.
repr is a function delegating to the individual
repr_png emit single-element character vectors or raw vectors. They have parameters also configurable via global
mime2repr is a list mapping all known mimetypes to
repr_* functions, e.g.
format2repr does the same for simple format names. So
repr will not use any packages not part of the R distribution.
Only if you want to use
repr_latex.function, and specify the parameter
highlight or option
repr.function.highlight to be
TRUE, then be sure to have highr installed.
Currently, the actually emitted formats are:
Plain text, for everything, using
capture.output(print(thing)). This will fail if
print(thing)plots it instead. Please report classes which do that and aren’t handled yet (such as
HTML, Markdown, and LaTeX, which are emitted for everything non-graphical
PNG, JPG, SVG, and PDF for everything graphical (ATM just
Why not Pander?
Because it emits just Markdown, which is the least semantic format available. A roundtrip through Markdown will undoubtedly create sub-par HTML and LaTeX.
Also Pander supports only text. Plots and images are also important to represent.
Pander is however awesome for high-quality Markdown so this project might want to depend on it.