• There are 712 files with units, with 66,401 lines of code.
• 1 very complex files (McCabe index sum 251+; 625 lines of code)
• 4 complex files (McCabe index sum 126-250; 4,002 lines of code)
• 17 medium complex files (McCabe index sum 51-125; 7,525 lines of code)
• 40 slightly complex files (McCabe index sum 26-50; 10,085 lines of code)
• 650 simple files (McCabe index sum 1-25; 44,164 lines of code)
• 1,380 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
interactiveSwfScript.js in admin/conf/resources/r2	625	45	255	41	21
PageElement.scala in common/app/model/dotcomrendering/pageElements	2169	26	182	8	72
HtmlCleaner.scala in common/app/views/support	777	49	172	22	20
Formats.scala in common/app/model	364	21	153	42	21
crossword.js in static/src/javascripts/projects/common/modules/crosswords	692	51	143	21	14
comment-box.js in static/src/javascripts/projects/common/modules/discussion	537	25	112	21	22
loader.js in static/src/javascripts/projects/common/modules/discussion	487	23	106	22	21
meta.scala in common/app/model	799	22	104	13	22
EmailSignupController.scala in common/app/controllers	678	26	104	15	10
lightbox.js in static/src/javascripts/projects/common/modules/gallery	564	41	88	16	10
FapiFrontPress.scala in facia-press/app/frontpress	579	29	88	15	10
FaciaController.scala in facia/app/controllers	450	25	87	19	19
comments.js in static/src/javascripts/projects/common/modules/discussion	511	18	86	17	15
gallery.js in static/src/javascripts/projects/commercial/modules/hosted	512	25	85	17	12
EmailAddons.scala in common/app/model	504	41	80	16	2
PuzzlesLayout.scala in common/app/model	229	4	69	30	62
DotcomRenderingUtils.scala in common/app/model/dotcomrendering	302	25	63	21	8
LiveBlogController.scala in article/app/controllers	336	15	58	17	10
component.js in static/src/javascripts/projects/common/modules	248	20	57	23	8
PuzzlesPageController.scala in applications/app/controllers	314	20	56	18	7
Commercial.scala in common/app/views/support	247	19	55	22	12
IndexPage.scala in common/app/services	228	8	51	22	27
ArchiveController.scala in archive/app/controllers	139	14	50	36	12
DotcomRenderingService.scala in common/app/renderers	527	28	49	9	9
Navigation.scala in common/app/navigation	284	11	47	17	10
content.scala in common/app/model	951	16	47	5	15
message.js in static/src/javascripts/projects/common/modules/ui	187	10	47	25	15
HostedContentController.scala in commercial/app/controllers	277	10	45	16	12
TrailsToShowcase.scala in common/app/common	590	24	44	7	8
ImageProfile.scala in common/app/views/support	364	17	44	12	15
assets.scala in common/app/common/Assets	133	11	42	32	12
CalloutExtraction.scala in common/app/model/dotcomrendering/pageElements	360	14	41	11	11
matches.scala in sport/app/football/model	185	15	40	22	8
BlockElement.scala in common/app/model/liveblog	208	5	40	19	34
Competitions.scala in sport/app/football/feed	415	14	38	9	7
search-tool.js in static/src/javascripts/projects/facia/modules/onwards	192	17	36	19	7
Atom.scala in common/app/model/content	483	23	35	7	5
ImageContentController.scala in applications/app/controllers	156	6	35	22	23
UrlHelpers.scala in common/app/navigation/helpers	85	4	34	40	26
package.scala in common/app/common	186	13	34	18	11
DotcomRenderingDataModel.scala in common/app/model/dotcomrendering	645	11	34	5	15
FaciaCard.scala in common/app/layout	223	8	33	15	7
package.scala in common/app/views/support	182	19	33	18	6
PuzzlesLayoutProvider.scala in applications/app/controllers	255	10	33	13	8
ArticleController.scala in article/app/controllers	161	9	33	20	13
TemplateTracker.java in template-tracker-agent/src/main/java/com/gu/templatetracker	141	7	32	23	6
ModelOrResult.scala in common/app/common	92	7	32	35	11
applyRenderConditions.scala.js in common/app/templates/inlineJS/blocking	106	10	32	30	14
EditionAdTargeting.scala in common/app/common/commercial	85	9	31	36	15
LinkedData.scala in common/app/model/dotcomrendering	411	9	31	8	9

• 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.