• There are 105 files with units, with 7,577 lines of code.
• 0 very complex files (McCabe index sum 251+; 0 lines of code)
• 0 complex files (McCabe index sum 126-250; 0 lines of code)
• 1 medium complex files (McCabe index sum 51-125; 210 lines of code)
• 6 slightly complex files (McCabe index sum 26-50; 1,743 lines of code)
• 98 simple files (McCabe index sum 1-25; 5,624 lines of code)
• 50 main files have no units (e.g. languages without unit analysis, or files without functions) and are not classified.

The McCabe index of a file grows with its size: per 100 lines tells a large but plain file from a dense one, and most complex unit whether the complexity sits in one unit or is spread over many.

File	# lines	# units	McCabe index (sum)	per 100 lines	most complex unit
AccountDetailsFromZuora.scala in membership-attribute-service/app/services	210	10	52	25	25
SubscriptionService.scala in membership-common/src/main/scala/com/gu/memsub/subsv2/services	160	10	43	27	14
ZuoraRestService.scala in membership-attribute-service/app/services/zuora/rest	560	15	40	7	9
AccountDetails.scala in membership-attribute-service/app/models	241	5	34	14	17
AccountController.scala in membership-attribute-service/app/controllers	340	9	32	9	7
ProductFamily.scala in membership-common/src/main/scala/com/gu/memsub	185	4	31	17	16
AttributeController.scala in membership-attribute-service/app/controllers	257	7	26	10	10
Subscription.scala in membership-common/src/main/scala/com/gu/memsub/subsv2	109	4	25	23	10
PaymentFailureAlerter.scala in membership-attribute-service/app/services	126	6	24	19	10
ExistingPaymentOptionsController.scala in membership-attribute-service/app/controllers	126	3	23	18	17
SimpleClientZuoraRestService.scala in membership-attribute-service/app/services/zuora/rest	141	12	21	15	4
PaymentService.scala in membership-attribute-service/app/services/zuora/payment	134	7	20	15	5
PaymentUpdateController.scala in membership-attribute-service/app/controllers	203	3	18	9	8
IdentityAuthService.scala in membership-attribute-service/app/services	71	3	18	25	9
BillingSchedule.scala in membership-common/src/main/scala/com/gu/memsub	89	6	18	20	9
Scalaforce.scala in membership-common/src/main/scala/com/gu/salesforce	142	7	15	11	5
CommonReads.scala in membership-common/src/main/scala/com/gu/memsub/subsv2/reads	38	3	14	37	8
ZuoraService.scala in membership-common/src/main/scala/com/gu/zuora	118	7	14	12	3
Stripe.scala in membership-common/src/main/scala/com/gu/stripe	162	3	14	9	6
ExistingPaymentOption.scala in membership-attribute-service/app/models	60	3	13	22	5
MobileSubscriptionPlatform.scala in membership-attribute-service/app/models	39	2	12	31	11
ContactController.scala in membership-attribute-service/app/controllers	87	3	12	14	6
WebServiceHelper.scala in membership-common/src/main/scala/com/gu/memsub/util	77	4	12	16	4
SafeLogger.scala in membership-common/src/main/scala/com/gu/monitoring	62	12	12	19	1
SubJsonReads.scala in membership-common/src/main/scala/com/gu/memsub/subsv2/reads	93	5	11	12	3
AuthAndBackendViaIdapiAction.scala in membership-attribute-service/app/actions	65	3	10	15	4
DynamoSupporterProductDataService.scala in membership-attribute-service/app/services	71	4	10	14	6
HttpBasicStripeService.scala in membership-attribute-service/app/services/stripe	48	4	10	21	4
CatJsonReads.scala in membership-common/src/main/scala/com/gu/memsub/subsv2/reads	65	4	10	15	3
ZuoraPaymentWrites.scala in membership-common/src/main/scala/com/gu/zuora/rest	66	2	10	15	6
Readers.scala in membership-common/src/main/scala/com/gu/zuora/rest	40	2	10	25	8
GuardianPatronService.scala in membership-attribute-service/app/services	131	5	9	7	3
DeliveryAddress.scala in membership-attribute-service/app/models	42	3	8	19	5
SupporterRatePlanToAttributesMapper.scala in membership-attribute-service/app/services	378	5	8	2	2
ContributionsStoreDatabaseService.scala in membership-attribute-service/app/services	72	5	8	11	4
SimpleClient.scala in membership-common/src/main/scala/com/gu/zuora/rest	57	3	7	12	5
Reader.scala in membership-common/src/main/scala/com/gu/salesforce/job	51	3	7	14	5
AddGuIdentityHeaders.scala in membership-attribute-service/app/filters	33	3	6	18	4
SentryLogging.scala in membership-attribute-service/app/monitoring	32	1	6	19	6
Sequence.scala in membership-attribute-service/app/services/subscription	16	1	6	38	6
SimpleContactRepository.scala in membership-attribute-service/app/services/salesforce	52	4	6	12	3
SimpleEitherT.scala in membership-attribute-service/app/utils	29	3	5	17	3
AuthAndBackendViaAuthLibAction.scala in membership-attribute-service/app/actions	29	1	5	17	5
MobileSubscriptionService.scala in membership-attribute-service/app/services	47	2	5	11	4
SqsAsync.scala in membership-attribute-service/app/services/mail	52	2	5	10	4
SetPaymentCard.scala in membership-attribute-service/app/services/zuora/payment	49	2	5	10	3
CancelSubscription.scala in membership-attribute-service/app/services/subscription	44	2	5	11	3
ScheduledTask.scala in membership-common/src/main/scala/com/gu/memsub/util	41	3	5	12	3
Plan.scala in membership-common/src/main/scala/com/gu/memsub/subsv2	205	3	5	2	3
CatalogService.scala in membership-common/src/main/scala/com/gu/memsub/subsv2/services	57	3	5	9	3

• File complexity is the sum of the McCabe indexes (conditional complexity) of the units (methods, functions...) in a file.
• Files are classified in five categories based on that sum: 1-25 (simple files), 26-50 (slightly complex files), 51-125 (medium complex files), 126-250 (complex files), 251+ (very complex files). The default bands are five times the unit complexity bands, as a file is a group of units.
• Only main code files with units are classified. Files without units (languages without unit analysis, or files without functions) have no complexity to measure and are left out rather than counted as simple.
• A very complex file holds many decisions, which often means it has too many responsibilities: a candidate to split, and a place where changes need more testing.