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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Style
# This cop checks that constants defined in classes and modules have
# an explicit visibility declaration. By default, Ruby makes all class-
# and module constants public, which litters the public API of the
# class or module. Explicitly declaring a visibility makes intent more
# clear, and prevents outside actors from touching private state.
#
# @example
#
# # bad
# class Foo
# BAR = 42
# BAZ = 43
# end
#
# # good
# class Foo
# BAR = 42
# private_constant :BAR
#
# BAZ = 43
# public_constant :BAZ
# end
#
class ConstantVisibility < Cop
MSG = 'Explicitly make `%<constant_name>s` public or private using ' \
'either `#public_constant` or `#private_constant`.'.freeze
def on_casgn(node)
return unless class_or_module_scope?(node)
return if visibility_declaration?(node)
add_offense(node)
end
private
def message(node)
_namespace, constant_name, _value = *node
format(MSG, constant_name: constant_name)
end
def class_or_module_scope?(node)
node.parent && %i[class module].include?(node.parent.type)
end
def visibility_declaration?(node)
_namespace, constant_name, _value = *node
node.parent.each_child_node(:send).any? do |child|
visibility_declaration_for?(child, constant_name)
end
end
def_node_matcher :visibility_declaration_for?, <<-PATTERN
(send nil? {:public_constant :private_constant} ({sym str} %1))
PATTERN
end
end
end
end
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