• There are 222 files with units, with 104,965 lines of code.
• 20 very complex files (McCabe index sum 251+; 46,015 lines of code)
• 14 complex files (McCabe index sum 126-250; 13,811 lines of code)
• 41 medium complex files (McCabe index sum 51-125; 19,229 lines of code)
• 38 slightly complex files (McCabe index sum 26-50; 9,354 lines of code)
• 109 simple files (McCabe index sum 1-25; 16,556 lines of code)
• 113 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
abc.hpp in lib/bill/bill/sat/solver	4221	203	1076	25	48
glucose.hpp in lib/bill/bill/sat/solver	3797	312	1015	27	52
maple.hpp in lib/bill/bill/sat/solver	3746	277	1002	27	47
ghack.hpp in lib/bill/bill/sat/solver	3145	272	912	29	53
watercluster2.c in lib/nauty	2792	79	789	28	75
format.h in lib/fmt/fmt	2797	305	593	21	28
phmap.h in lib/parallel_hashmap/parallel_hashmap	3171	315	560	18	7
btree.h in lib/parallel_hashmap/parallel_hashmap	3042	254	503	17	17
maj_encoder.hpp in lib/percy/percy/encoders	1674	60	492	29	68
satSolver.cpp in lib/abcsat	1838	75	446	24	32
aig_encoder.hpp in lib/percy/percy/encoders	1518	53	444	29	68
concurrentqueue.h in lib/percy/percy	2625	99	383	15	44
phmap_base.h in lib/parallel_hashmap/parallel_hashmap	3129	235	344	11	5
Glucose.cpp in lib/abcsat	1021	34	311	30	47
verilog.hpp in lib/lorina/lorina	1252	73	311	25	37
mig_encoder.hpp in lib/percy/percy/encoders	1299	46	309	24	27
operations.hpp in lib/kitty/kitty	1495	111	265	18	22
vecInt.h in lib/bill/bill/sat/solver/abc	1150	93	261	23	7
vecInt.h in lib/abcsat/abc	1157	93	261	23	7
vecInt.h in lib/abcesop/eabc	1146	93	260	23	7
format-inl.h in lib/fmt/fmt	1115	60	239	21	27
constructors.hpp in lib/kitty/kitty	1077	32	233	22	66
spectral.hpp in lib/kitty/kitty	924	46	201	22	67
partial_dag_encoder.hpp in lib/percy/percy/encoders	990	26	199	20	42
matplotlibcpp.h in lib/matplot/matplot	1844	87	198	11	13
chrono.h in lib/fmt/fmt	891	106	186	21	10
dag_generation.hpp in lib/percy/percy	987	55	176	18	24
SimpSolver.cpp in lib/abcsat	516	22	170	33	26
ditt_maj_encoder.hpp in lib/percy/percy/encoders	658	22	163	25	22
core.h in lib/fmt/fmt	1235	112	161	13	21
ssv_encoder.hpp in lib/percy/percy/encoders	1166	19	155	13	20
zdd.hpp in lib/bill/bill/dd	763	35	134	18	12
ssv_fence2_encoder.hpp in lib/percy/percy/encoders	684	23	132	19	22
shift.hpp in lib/kitty/kitty/detail	961	1	128	13	128
phmap_bits.h in lib/parallel_hashmap/parallel_hashmap	447	83	123	28	9
printf.h in lib/fmt/fmt	517	51	120	23	33
partial_dag_generator.hpp in lib/percy/percy/generators	572	29	117	20	16
partial_dag3_generator.hpp in lib/percy/percy/generators	536	26	108	20	18
npn.hpp in lib/kitty/kitty	748	19	107	14	13
percy.hpp in lib/percy/percy	1651	9	102	6	23
abc_global.h in lib/bill/bill/sat/solver/abc	291	52	100	34	15
abc_global.h in lib/abcsat/abc	296	52	100	34	15
vecPtr.h in lib/abcesop/eabc	518	41	98	19	9
exorList.cpp in lib/abcesop	631	21	93	15	17
Solver.h in lib/bill/bill/sat/solver/abc	319	58	92	29	9
Solver.h in lib/abcsat/abc	319	58	92	29	9
AbcGlucose.cpp in lib/abcsat	402	58	92	23	9
partial_dag.hpp in lib/percy/percy	538	16	92	17	15
majority_chain.hpp in lib/percy/percy	370	11	80	22	50
compile.h in lib/fmt/fmt	480	49	77	16	12

• 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.