Contents

# frozen_string_literal: true

##
# Abstraction for an attribute to determine its name, reader, writer, and
# instance variable name.
class Attribool::Attribute
  ##
  # The name of the attribute, without the leading "@".
  #
  # @return [String]
  attr_reader :name

  ##
  # The name of the instance variable for the attribute, with the leading "@".
  #
  # @return [String]
  attr_reader :ivar

  ##
  # The name of the reader for the attribute.
  #
  # @return [String]
  attr_reader :reader

  ##
  # The name of the writer for the attribute.
  #
  # @return [String]
  attr_reader :writer

  class << self
    ##
    # Ensures that if multiple attributes are being defined, and +method_name+
    # is provided, that +method_name+ is a +Proc+.
    #
    # @param [Integer] number_of_attributes
    #
    # @param [String, Symbol, Proc] method_name
    def validate_method_name(method_name, number_of_attributes)
      return if number_of_attributes == 1 || nil_or_proc?(method_name)

      raise ArgumentError, "Must use a Proc when creating multiple methods"
    end

    private

    def nil_or_proc?(method_name) # :nodoc:
      method_name.nil? || (method_name.is_a?(Proc) && method_name.arity == 1)
    end
  end

  ##
  # Create an Attribute. The attribute can either be a String or a Symbol, and
  # can also start with an "@", or not.
  #
  # @param [String, Symbol] attribute
  #
  # @param [String, Symbol, Proc, nil] reader_name
  def initialize(attribute, reader_name = nil)
    attribute.to_s.tap do |a|
      @ivar = a.start_with?('@') ? a : "@#{a}"
      @name = @ivar.delete_prefix('@')
      @reader =
        case reader_name
        when Proc then reader_name.call(name)
        when nil then "#{name}?"
        else reader_name.to_s
        end
      @writer = "#{name}="
    end
  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
attribool-1.0.3	lib/attribool/attribute.rb