Factorio blueprint parsing with ruby

factorio_blueprint.rb

require 'base64'
require 'zlib'
require 'json'

# Sample blueprint, one burner mining drill and one stone furnace
blueprint = "0eNqF0N0KwjAMBeB3yXU7ZtkG9lVEZD9xBLpstJ04Rt/ddiIMRb1rCufrSVdozIyTJfagV6B2ZAf6tIKjnmuT7vwyIWggjwMI4HpIUzNbRisHYuJedpaMgSCAuMM76EMQfwXnR0Z5jU7d4i6rwlkAsidP+KyyDcuF56FBG/EvhIBpdDE1cnozSjLPSgFLPByyMqRKb5L6uc6H9+LypMWS2z5694ECbmjdFqiKQhXHXFVlFcIDjTN2Tg=="

# @param [String] blueprint
# @return [Hash]
def blueprint_to_hash(blueprint)
  JSON.parse(Zlib.inflate(Base64.decode64(blueprint.slice(1..-1))))
end

# @param [Hash] data
# @return [String]
def hash_to_blueprint(data)
  "0#{Base64.encode64(Zlib.deflate(data.to_json, Zlib::BEST_COMPRESSION))}".gsub("\n", '')
end

# pretty print
require 'pp'
pp blueprint_to_hash(blueprint)
puts hash_to_blueprint(blueprint_to_hash(blueprint)) == blueprint

##
# Output:
#
# {"blueprint"=>
#  {"icons"=>
#    [{"signal"=>{"type"=>"item", "name"=>"burner-mining-drill"}, "index"=>1},
#     {"signal"=>{"type"=>"item", "name"=>"stone-furnace"}, "index"=>2}],
#   "entities"=>
#    [{"entity_number"=>1,
#      "name"=>"stone-furnace",
#      "position"=>{"x"=>-0.5, "y"=>-1.5}},
#     {"entity_number"=>2,
#      "name"=>"burner-mining-drill",
#      "position"=>{"x"=>0.5, "y"=>0.5}}],
#   "item"=>"blueprint",
#   "version"=>64424902656}}
# true