Class: Key

Inherits:
Object show all
Defined in:
lib/presenter/key.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ Key

Returns a new instance of Key.



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# File 'lib/presenter/key.rb', line 5

def initialize(*args)
  @options = args.last.is_a?(Hash) ? args.pop : {}
  @name, @type = args.shift.to_s, args.shift || Object
  @default_value = @options.delete(:default)
  @options = nil if @type.method(:typecast).arity == 1
end

Instance Attribute Details

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/presenter/key.rb', line 3

def name
  @name
end

Instance Method Details

#default_value ⇒ Object 



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# File 'lib/presenter/key.rb', line 23

def default_value
  value = @default_value.is_a?(Proc) ? @default_value.call : @default_value
  @type.typecast(value)
end

#to_s ⇒ Object 



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# File 'lib/presenter/key.rb', line 28

def to_s
  "#<Key: name=#{name}, type=#{type}>"
end

#typecast(value) ⇒ Object 



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# File 'lib/presenter/key.rb', line 12

def typecast(value)
  if value.is_a?(Array)
    array = value.map { |v| typecast(v) }.compact
    array.any? ? array : nil
  elsif value.nil? || (value.respond_to?(:empty?) && value.empty?)
    nil
  else
    @options ? @type.typecast(value, @options) : @type.typecast(value)
  end
end