class Holidays::Definition::Generator::Module

def call(module_name, files, regions, month_strings, custom_methods)
  raise ArgumentError.new("module name cannot be nil") if module_name.nil?
  raise ArgumentError.new("module name cannot be blank") if module_name.empty?
  raise ArgumentError.new("files cannot be nil") if files.nil?
  raise ArgumentError.new("files cannot be empty") if files.empty?
  raise ArgumentError.new("files must all be strings") unless files.all? { |f| f.is_a?(String) }
  raise ArgumentError.new("regions cannot be nil") if regions.nil?
  raise ArgumentError.new("regions cannot be empty") if regions.empty?
  raise ArgumentError.new("month strings cannot be nil") if month_strings.nil?
  raise ArgumentError.new("month strings cannot be empty") if month_strings.empty?
  module_src =<<-EOM
ng: utf-8
olidays
 file is generated by the Ruby Holidays gem.
nitions loaded: #{files.join(', ')}
the definitions are available at https://github.com/holidays/holidays
 #{module_name.to_s.upcase} # :nodoc:
self.defined_regions
#{regions.join(', :')}]
self.holidays_by_month
  #{month_strings.join(",\n")}
self.custom_methods
  #{custom_methods}
  EOM
  module_src
end