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# frozen_string_literal: true
module Net
class IMAP
class Config
# >>>
# *NOTE:* This module is an internal implementation detail, with no
# guarantee of backward compatibility.
#
# Adds a +type+ keyword parameter to +attr_accessor+, to enforce that
# config attributes have valid types, for example: boolean, numeric,
# enumeration, non-nullable, etc.
module AttrTypeCoercion
# :stopdoc: internal APIs only
module Macros # :nodoc: internal API
def attr_accessor(attr, type: nil)
super(attr)
AttrTypeCoercion.attr_accessor(attr, type: type)
end
end
private_constant :Macros
def self.included(mod)
mod.extend Macros
end
private_class_method :included
def self.attr_accessor(attr, type: nil)
return unless type
if :boolean == type then boolean attr
elsif Integer == type then integer attr
elsif Array === type then enum attr, type
else raise ArgumentError, "unknown type coercion %p" % [type]
end
end
def self.boolean(attr)
define_method :"#{attr}=" do |val| super !!val end
define_method :"#{attr}?" do send attr end
end
def self.integer(attr)
define_method :"#{attr}=" do |val| super Integer val end
end
def self.enum(attr, enum)
enum = enum.dup.freeze
expected = -"one of #{enum.map(&:inspect).join(", ")}"
define_method :"#{attr}=" do |val|
unless enum.include?(val)
raise ArgumentError, "expected %s, got %p" % [expected, val]
end
super val
end
end
end
end
end
end
Version data entries
18 entries across 17 versions & 4 rubygems