class Shoulda::Matchers::ActiveModel::ValidateFormatOfMatcher

def allow_blank(allow_blank = true)
  @options[:allow_blank] = allow_blank
  self
end

def allow_nil(allow_nil = true)
  @options[:allow_nil] = allow_nil
  self
end

def allows_blank_value?
  if @options.key?(:allow_blank)
    @options[:allow_blank] == allows_value_of('')
  else
    true
  end
end

def allows_nil_value?
  if @options.key?(:allow_nil)
    @options[:allow_nil] == allows_value_of(nil)
  else
    true
  end
end

def description
  "have a valid format for #{@attribute}"
end

def initialize(attribute)
  ActiveSupport::Deprecation.warn 'The validate_format_of matcher is deprecated and will be removed in 2.0'
  super
  @options = {}
end

def matches?(subject)
  super(subject)
  @expected_message ||= :invalid
  if @value_to_fail
    disallows_value_of(@value_to_fail, @expected_message) && allows_blank_value? && allows_nil_value?
  else
    allows_value_of(@value_to_pass, @expected_message) && allows_blank_value? && allows_nil_value?
  end
end

def not_with(value)
  if @value_to_pass
    raise 'You may not call both with and not_with'
  else
    @value_to_fail = value
    self
  end
end

def with(value)
  if @value_to_fail
    raise 'You may not call both with and not_with'
  else
    @value_to_pass = value
    self
  end
end

def with_message(message)
  if message
    @expected_message = message
  end
  self
end