cascade.rb

# Standard cascade of JSON dependencies.
# Cascades from fastest performing & hardest dependency management (odd C libraries)
#          to   slowest performing & easiest dependency management (pure Ruby)
# Meant for libraries like TwitterSearch & LeGit

def cascade_require(*libs)
  require libs.shift.to_s
rescue LoadError
  libs.empty? ? raise : retry
end

cascade_require 'yajl-ruby', 'json', 'json_pure'