after_2_0_0  = [ '~> 2.0.2' ]
before_2_4_0 = [ '< 1.8.5' ]
before_2_2_0 = [ '~> 1.7.7', '~> 1.6.8', '~> 1.5.5' ]

json_gems = []
json_gems += after_2_0_0  if RUBY_VERSION >= '2.0.0'
json_gems += before_2_4_0 if RUBY_VERSION < '2.4.0'
json_gems += before_2_2_0 if RUBY_VERSION < '2.2.0'

if RUBY_ENGINE == "jruby"
  json_gems.delete('~> 1.2.4')
  json_gems.delete('~> 1.1.9')
end

json_gems.each do |version|
  gemfile <<-RB
    gem 'rack'
    gem 'json', '#{version}'
  RB
end

# vim: ft=ruby