• There are 25 files with units, with 2,967 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; 260 lines of code)
• 2 slightly complex files (McCabe index sum 26-50; 232 lines of code)
• 22 simple files (McCabe index sum 1-25; 2,475 lines of code)
• 19 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
object_serializer.rb in lib/fast_jsonapi	260	28	87	33	7
serialization_core.rb in lib/fast_jsonapi	129	11	42	33	12
relationship.rb in lib/fast_jsonapi	103	11	27	26	5
movie_context.rb in spec/shared/contexts	404	17	19	5	2
multi_to_json.rb in lib/fast_jsonapi	78	9	19	24	3
js_context.rb in spec/shared/contexts	105	8	8	8	1
js_group_context.rb in spec/shared/contexts	94	6	6	6	1
attribute.rb in lib/fast_jsonapi	26	3	6	23	3
ams_context.rb in spec/shared/contexts	138	5	5	4	1
jsonapi_context.rb in spec/shared/contexts	98	4	4	4	1
jsonapi_group_context.rb in spec/shared/contexts	92	4	4	4	1
object_serializer_inheritance_spec.rb in spec/lib	135	4	4	3	1
object_serializer_performance_spec.rb in spec/lib	168	3	3	2	1
link.rb in lib/fast_jsonapi	16	2	3	19	2
object_serializer_spec.rb in spec/lib	421	2	2	0	1
has_one.rb in lib/extensions	12	1	2	17	2
serializer_generator.rb in lib/generators/serializer	12	2	2	17	1
group_context.rb in spec/shared/contexts	77	1	1	1	1
ams_group_context.rb in spec/shared/contexts	72	1	1	1	1
object_serializer_class_methods_spec.rb in spec/lib	381	1	1	0	1
object_serializer_attribute_param_spec.rb in spec/lib	90	1	1	1	1
serialized_json.rb in lib/fast_jsonapi/instrumentation	11	1	1	9	1
serializable_hash.rb in lib/fast_jsonapi/instrumentation	11	1	1	9	1
serialized_json.rb in lib/fast_jsonapi/instrumentation/skylight/normalizers	17	1	1	6	1
serializable_hash.rb in lib/fast_jsonapi/instrumentation/skylight/normalizers	17	1	1	6	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.