• There are 24 files with units, with 1,598 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; 294 lines of code)
• 1 slightly complex files (McCabe index sum 26-50; 313 lines of code)
• 22 simple files (McCabe index sum 1-25; 991 lines of code)
• 16 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
store.scala in api/src/main/scala/com/gu/core/store	294	20	56	19	11
Store.scala in api/src/main/scala/com/gu/adapters/store	313	16	31	10	6
AvatarServlet.scala in api/src/main/scala/com/gu/adapters/http	240	6	21	9	8
Filter.scala in api/src/main/scala/com/gu/adapters/http	58	2	20	34	18
Authentication.scala in api/src/main/scala/com/gu/adapters/http	150	6	18	12	5
ErrorHandling.scala in api/src/main/scala/com/gu/core/utils	40	5	11	28	3
Image.scala in api/src/main/scala/com/gu/adapters/http	42	4	10	24	5
errors.scala in api/src/main/scala/com/gu/core/models	59	7	7	12	1
Links.scala in api/src/main/scala/com/gu/adapters/http	18	1	7	39	7
Notifications.scala in api/src/main/scala/com/gu/adapters/notifications	53	4	6	11	2
statuses.scala in api/src/main/scala/com/gu/core/models	14	1	5	36	5
responses.scala in api/src/main/scala/com/gu/adapters/http	39	5	5	13	1
IOUtils.scala in api/src/main/scala/com/gu/adapters/http	29	3	4	14	2
order.scala in api/src/main/scala/com/gu/core/models	10	1	3	30	3
SqsDeletionConsumer.scala in api/src/main/scala/com/gu/adapters/queue	56	2	3	5	2
ScalatraBootstrap.scala in api/src/main/scala	31	2	2	6	1
utils.scala in api/src/main/scala/com/gu/core/utils	15	2	2	13	1
DeletionEvent.scala in api/src/main/scala/com/gu/core/models	23	1	2	9	2
Config.scala in api/src/main/scala/com/gu/adapters/config	51	2	2	4	1
Pekko.scala in api/src/main/scala/com/gu/core/pekko	15	1	1	7	1
User.scala in api/src/main/scala/com/gu/core/models	11	1	1	9	1
AuthorizedApiServlet.scala in api/src/main/scala/com/gu/adapters/http	15	1	1	7	1
Req.scala in api/src/main/scala/com/gu/adapters/http	9	1	1	11	1
ServletWithErrorHandling.scala in api/src/main/scala/com/gu/adapters/http	13	1	1	8	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.