class PasswordCharacters::PasswordAndOrdinals

Public Class Methods

new(password, ordinals) click to toggle source
# File lib/password_characters.rb, line 10
def initialize(password, ordinals)
  raise(ArgumentError, "#{ordinals} does not ask for any characters") if ordinals.empty?
  raise(ArgumentError, "#{ordinals} only asks for one character") if ordinals.one?

  raise(ArgumentError, "#{ordinals} does not only ask for integers") unless ordinals.all? { |o| o.is_a? Fixnum }

  raise(ArgumentError, "#{ordinals} is not in ascending order") unless sorted?(ordinals)

  raise(ArgumentError, "#{ordinals.uniq.to_sentence} duplicated in #{ordinals}") unless uniq?(ordinals)
  raise(ArgumentError, "#{ordinals} would reveal entire password") unless ordinals.size < password.size # needs to come after checking duplicates

  raise(ArgumentError, "#{ordinals_out_of_bounds(password, ordinals).to_sentence} out of bounds") unless ordinals.all? { |i| i.in? ordinal_range(password) }

  @password_array = password.chars
  @indices = indices ordinals
end

Public Instance Methods

characters() click to toggle source
# File lib/password_characters.rb, line 27
def characters
  @indices.map { |i| @password_array.at i }
end

Private Instance Methods

indices(ordinals) click to toggle source
# File lib/password_characters.rb, line 49
def indices(ordinals)
  ordinals.map { |n| n - 1 }
end
ordinal_range(password) click to toggle source
# File lib/password_characters.rb, line 45
def ordinal_range(password)
  1..password.length
end
ordinals_out_of_bounds(password, ordinals) click to toggle source
# File lib/password_characters.rb, line 41
def ordinals_out_of_bounds(password, ordinals)
  ordinals.reject { |i| i.in? ordinal_range(password) }
end
sorted?(a) click to toggle source
# File lib/password_characters.rb, line 33
def sorted?(a)
  a.sort == a
end
uniq?(a) click to toggle source
# File lib/password_characters.rb, line 37
def uniq?(a)
  a.uniq == a
end