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# # = ostruct.rb: OpenStruct implementation # # Author:: Yukihiro Matsumoto # Documentation:: Gavin Sinclair # # OpenStruct allows the creation of data objects with arbitrary attributes. # See OpenStruct for an example. # # # OpenStruct allows you to create data objects and set arbitrary attributes. # For example: # # require 'ostruct' # # record = OpenStruct.new # record.name = "John Smith" # record.age = 70 # record.pension = 300 # # puts record.name # -> "John Smith" # puts record.address # -> nil # # It is like a hash with a different way to access the data. In fact, it is # implemented with a hash, and you can initialize it with one. # # hash = { "country" => "Australia", :population => 20_000_000 } # data = OpenStruct.new(hash) # # p data # -> <OpenStruct country="Australia" population=20000000> # class OpenStruct # # Create a new OpenStruct object. The optional +hash+, if given, will # generate attributes and values. For example. # # require 'ostruct' # hash = { "country" => "Australia", :population => 20_000_000 } # data = OpenStruct.new(hash) # # p data # -> <OpenStruct country="Australia" population=20000000> # # By default, the resulting OpenStruct object will have no attributes. # def initialize(hash=nil) @table = {} if hash for k,v in hash @table[k.to_sym] = v new_ostruct_member(k) end end end # Duplicate an OpenStruct object members. def initialize_copy(orig) super @table = @table.dup end def marshal_dump @table end def marshal_load(x) @table = x @table.each_key{|key| new_ostruct_member(key)} end def modifiable if self.frozen? raise TypeError, "can't modify frozen #{self.class}", caller(2) end @table end protected :modifiable def new_ostruct_member(name) name = name.to_sym unless self.respond_to?(name) class << self; self; end.class_eval do define_method(name) { @table[name] } define_method("#{name}=") { |x| modifiable[name] = x } end end name end def method_missing(mid, *args) # :nodoc: mname = mid.id2name len = args.length if mname.chomp!('=') if len != 1 raise ArgumentError, "wrong number of arguments (#{len} for 1)", caller(1) end modifiable[new_ostruct_member(mname)] = args[0] elsif len == 0 @table[mid] else raise NoMethodError, "undefined method `#{mname}' for #{self}", caller(1) end end # # Remove the named field from the object. # def delete_field(name) @table.delete name.to_sym end InspectKey = :__inspect_key__ # :nodoc: # # Returns a string containing a detailed summary of the keys and values. # def inspect str = "#<#{self.class}" ids = (Thread.current[InspectKey] ||= []) if ids.include?(object_id) return str << ' ...>' end ids << object_id begin first = true for k,v in @table str << "," unless first first = false str << " #{k}=#{v.inspect}" end return str << '>' ensure ids.pop end end alias :to_s :inspect attr_reader :table # :nodoc: protected :table # # Compare this object and +other+ for equality. # def ==(other) return false unless(other.kind_of?(OpenStruct)) return @table == other.table end end