• There are 60 files with units, with 6,476 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)
• 0 medium complex files (McCabe index sum 51-125; 0 lines of code)
• 5 slightly complex files (McCabe index sum 26-50; 1,034 lines of code)
• 55 simple files (McCabe index sum 1-25; 5,442 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
passkeys.js in frontend/utils	305	11	49	16	14
DBSetupApp.scala in setup/src/main/scala/aws	120	2	30	25	24
UserAccess.scala in app/logic	255	10	27	11	6
Config.scala in app/conf	158	12	26	16	5
Loader.scala in configTools/src/main/scala/com/gu/janus/config	196	8	26	13	6
PasskeyAuthFilter.scala in app/filters	160	8	22	14	7
Date.scala in app/logic	99	12	22	22	5
janus.js in frontend	374	8	22	6	8
PasskeyController.scala in app/controllers	275	8	20	7	4
JsonErrorFormatter.scala in app/models	51	3	18	35	11
MetricsService.scala in app/services	247	6	16	6	3
Janus.scala in app/controllers	436	8	15	3	6
Federation.scala in app/aws	176	7	14	8	6
Passkey.scala in app/models	160	7	13	8	4
Passkey.scala in app/logic	198	6	12	6	3
AuditTrail.scala in app/logic	169	5	12	7	5
PasskeyDB.scala in app/aws	253	8	12	5	4
models.scala in configTools/src/main/scala/com/gu/janus/model	141	6	12	9	3
DeveloperPolicies.scala in app/logic	69	4	11	16	6
ViewHelpers.scala in app/logic	63	4	10	16	4
Accounts.scala in app/logic	78	6	9	12	3
modalUtils.js in frontend/utils	262	2	9	3	5
Validation.scala in configTools/src/main/scala/com/gu/janus	68	5	9	13	3
Statements.scala in configTools/src/main/scala/com/gu/janus/policy	83	6	8	10	3
Favourites.scala in app/logic	54	4	7	13	3
DeveloperPolicyCachingService.scala in app/services	173	4	7	4	2
AccountOrdering.scala in app/logic	57	2	6	11	4
DeveloperPolicy.scala in app/models	72	1	6	8	6
PasskeyChallengeDB.scala in app/aws	94	5	6	6	2
ResultHandler.scala in app/controllers	25	1	6	24	6
RevokePermissions.scala in app/controllers	118	3	6	5	3
Audit.scala in app/controllers	81	4	6	7	2
snow.js in frontend	67	3	6	9	4
toastMessages.js in frontend/utils	28	2	6	21	5
Customisation.scala in app/logic	28	2	5	18	4
models.scala in app/models	189	1	5	3	5
AuditTrailDB.scala in app/aws	93	5	5	5	1
Validation.scala in app/controllers	16	1	5	31	5
Main.scala in example/src/main/scala/com/example	46	1	5	11	5
VerifyJanusData.scala in configTools/src/main/scala/com/gu/janus	37	1	5	14	5
JanusConfig.scala in configTools/src/main/scala/com/gu/janus	39	5	5	13	1
PasskeyRegistrationAuthFilter.scala in app/filters	45	2	4	9	3
AccountsController.scala in app/controllers	93	2	4	4	3
Revocation.scala in app/logic	11	1	2	18	2
PlayHelpers.scala in app/logic	7	1	2	29	2
csrf.js in frontend/utils	13	1	2	15	2
Support.scala in example/src/main/scala/com/example	37	1	2	5	2
AuditTrailDBSetup.scala in setup/src/main/scala/aws	86	2	2	2	1
RunClientHook.scala in project	26	1	2	8	2
Writer.scala in configTools/src/main/scala/com/gu/janus/config	14	2	2	14	1

• 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.