'Rcpp' Bindings to Parser for Tom's Obvious Markup Language

The configuration format defined by 'TOML' (which expands to "Tom's Obvious Markup Language") specifies an excellent format (described at < https://github.com/toml-lang/toml>) suitable for both human editing as well as the common uses of a machine-readable format. This package uses 'Rcpp' to connect the 'cpptoml' parser written by Chase Geigle (in modern C++11) to R.

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Rcpp bindings for TOML

What is TOML?

TOML is a configuration file grammar for humans. It is easier to read and edit than the alternatives yet arguably more useful as it is strongly typed: values come back as integer, double, (multiline-) character (strings), boolean or Datetime. Moreover, complex nesting and arrays are supported as well.

This package uses the C++11 implementation written by Chase Geigle in cpptoml to implement a parser used by R.


Consider the following TOML input example input:

# This is a TOML document.
title = "TOML Example"
name = "Tom Preston-Werner"
dob = 1979-05-27T07:32:00-08:00 # First class dates
server = ""
ports = [ 800180018002 ]
connection_max = 5000
enabled = true
  # Indentation (tabs and/or spaces) is allowed but not required
  ip = ""
  dc = "eqdc10"
  ip = ""
  dc = "eqdc10"
data = [ ["gamma""delta"], [12] ]
# Line breaks are OK when inside arrays
hosts = [

Once parsed, note how R has properly typed input:

R> library(RcppTOML)
R> parseTOML("inst/toml/example.toml")
List of 5
 $ clients :List of 2
  ..$ data :List of 2
  .. ..$ : chr [1:2] "gamma" "delta"
  .. ..$ : int [1:2] 1 2
  ..$ hosts: chr [1:2] "alpha" "omega"
 $ database:List of 4
  ..$ connection_max: int 5000
  ..$ enabled       : logi TRUE
  ..$ ports         : int [1:3] 8001 8001 8002
  ..$ server        : chr ""
 $ owner   :List of 2
  ..$ dob : POSIXct[1:1], format: "1979-05-27 15:32:00"
  ..$ name: chr "Tom Preston-Werner"
 $ servers :List of 2
  ..$ alpha:List of 2
  .. ..$ dc: chr "eqdc10"
  .. ..$ ip: chr ""
  ..$ beta :List of 2
  .. ..$ dc: chr "eqdc10"
  .. ..$ ip: chr ""
 $ title   : chr "TOML Example"

See the other examples and the upstream documentation for more. Also note that most decent editors have proper TOML support which makes editing and previewing a breeze:


The package is on CRAN and can be installed from every mirror via


Development releases may be provided by the ghrr repository which can accessed via

## if needed, first do:  install.packages("drat")


Feature-complete with TOML v0.4.0, see the tests/ directory. It parses everything that the underlying cpptoml parses with the same (sole) exception of unicode escape characters in strings.


Dirk Eddelbuettel


GPL (>= 2)


Reference manual

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0.1.6 by Dirk Eddelbuettel, a year ago


Report a bug at https://github.com/eddelbuettel/rcpptoml/issues

Browse source code at https://github.com/cran/RcppTOML

Authors: Dirk Eddelbuettel

Documentation:   PDF Manual  

GPL (>= 2) license

Imports Rcpp

Suggests tinytest

Linking to Rcpp

System requirements: A C++11 compiler; g++ (>= 4.8.*) should be fine.

Imported by configr, sen2r.

See at CRAN