diff options
Diffstat (limited to 'rubocop/cop/module_with_instance_variables.rb')
-rw-r--r-- | rubocop/cop/module_with_instance_variables.rb | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/rubocop/cop/module_with_instance_variables.rb b/rubocop/cop/module_with_instance_variables.rb new file mode 100644 index 00000000000..6ed1b986fdd --- /dev/null +++ b/rubocop/cop/module_with_instance_variables.rb @@ -0,0 +1,55 @@ +module RuboCop + module Cop + class ModuleWithInstanceVariables < RuboCop::Cop::Cop + MSG = <<~EOL.freeze + Do not use instance variables in a module. Please read this + for the rationale behind it: + + doc/development/module_with_instance_variables.md + + If you think the use for this is fine, please just add: + # rubocop:disable Cop/ModuleWithInstanceVariables + EOL + + def on_module(node) + return if + rails_helper?(node) || rails_mailer?(node) || spec_helper?(node) + + check_method_definition(node) + + # Not sure why some module would have an extra begin wrapping around + node.each_child_node(:begin) do |begin_node| + check_method_definition(begin_node) + end + end + + private + + # We ignore Rails helpers right now because it's hard to workaround it + def rails_helper?(node) + node.source_range.source_buffer.name =~ + %r{app/helpers/\w+_helper.rb\z} + end + + # We ignore Rails mailers right now because it's hard to workaround it + def rails_mailer?(node) + node.source_range.source_buffer.name =~ + %r{app/mailers/emails/} + end + + # We ignore spec helpers because it usually doesn't matter + def spec_helper?(node) + node.source_range.source_buffer.name =~ + %r{spec/support/|features/steps/} + end + + def check_method_definition(node) + node.each_child_node(:def) do |definition| + definition.each_descendant(:ivar, :ivasgn) do |offense| + add_offense(offense, :expression) + end + end + end + end + end +end |