In timelyportfolio/railroadR: Railroad Diagrams for R

knitr::opts_chunk$set(
  comment = "#>",
  tidy = FALSE,
  error = FALSE,
  fig.width = 8,
  fig.height = 8)

railroadR

Railroad Diagrams for R

Generate railroad diagrams in R with the convenience and infrastructure of htmlwidgets, or eventually create static SVG railroad diagrams for use in non-htmlwidget situations. Thanks so much to Tab Atkins, Jr. for the JavaScript library railroad-diagrams that actually does all the hard work.

Installation

devtools::install_github("timelyportfolio/railroadR")

Usage

library(railroadR)

railroad(
  Choice(0, 'u', 'U'),
    Choice(0, 'r', 'R'),
    Choice(0, 'l', 'L'),
    '(',
    Choice(1,
        Optional(NonTerminal('WS')),
        Sequence(
            Optional(NonTerminal('WS')),
            NonTerminal('STRING', '#string'),
            Optional(NonTerminal('WS'))),
        Sequence(
            Optional(NonTerminal('WS')),
            OneOrMore(
                Choice(0,
                    NonTerminal('not " \' ( ) WS or NPC'),
          NonTerminal('escape'))),
          Optional(NonTerminal('WS'))
            )
        ),
  ')'
)