require 'lgenerator'
gen = Generator.new do |g|
  # default non-terminal is main, can be set with    start :whatever
  main.is :hello, "\n", :ex1, "\n", :ex2
  hello.is "Hello, ", :somebody, "!"
  somebody.is "matz" | "world"     # basic disjunction

  ex1.is "This is a more ", ("complex " | "elaborate "), :example, "."
  example.is "example" | "test"

  ex2.define do
    is "Some simple sentence."
    is "Another, involving ", ["a more complex ", :exp] | "harder stuff ", "."
    is "Yet another possibility; each one is chosen with prob. 1/3."
  end
 
  exp.is "expression" | "disjunction" | :example
end

puts gen.generate

#>> Hello, world!
#>> This is a more elaborate test.
#>> Yet another possibility; each one is chosen with prob. 1/3.