Module: TypedAttr::ModuleMethods

Defined in:
lib/typed_attr.rb

Constant Summary collapse

OPTIONS = 
{ }

Instance Method Summary collapse

Instance Method Details

#typed_attr(*types_and_names) ⇒ Object

typed_attr name: Type, … typed_attr Type, :name, …

Generates an initialize method that will accept each :name as a typechecked positional argument. Unspecified arguments are undefined and not typechecked. Additional arguments are ignored.



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# File 'lib/typed_attr.rb', line 35

def typed_attr *types_and_names
  if h = types_and_names.first and Hash === h and types_and_names.size == 1
    names = h.keys
    name_to_type = h
  else
    name_to_type = Hash[*types_and_names.reverse]
    names =
      (0 .. types_and_names.size).to_a.
      keep_if(&:odd?).
      map { | i | types_and_names[i] }
  end
  expr = <<"END"
def initialize *__args
  initialize_typed_attrs *__args
end

def initialize_typed_attrs *__args
  #{names.map_with_index do | name, i |
  "@#{name} = __args[#{i}] if __args.size > #{i}"
  end * "\n  "}
  #{"binding.pry if #{OPTIONS[:pry_if] || true}" if OPTIONS[:pry]}
  #{names.map_with_index do | name, i |
type = name_to_type[name]
"typecheck @#{name}, #{type} if __args.size > #{i}"
  end * "\n  "}
end
attr_reader #{names.map(&:to_sym).map(&:inspect) * ', '}
END
  $stderr.puts "#{self}\n#{expr}" if OPTIONS[:debug]
  class_eval expr
end

#typed_attr_option(opts) ⇒ Object 



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# File 'lib/typed_attr.rb', line 25

def typed_attr_option opts
  OPTIONS.update(opts)
end