apache / httpd-tests - Conditional Complexity

Intro

Conditional complexity (also called cyclomatic complexity) is a term used to measure the complexity of software. The term refers to the number of possible paths through a program function. A higher value ofter means higher maintenance and testing costs (infosecinstitute.com).
Conditional complexity is calculated by counting all conditions in the program that can affect the execution path (e.g. if statement, loops, switches, and/or operators, try and catch blocks...).
Conditional complexity is measured at the unit level (methods, functions...).
Units are classified in four categories based on the measured McCabe index: 1-5 (simple units), 6-10 (medium complex units), 11-25 (complex units), 26+ (very complex units).

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Conditional Complexity Overall

There are 149 units with 2,282 lines of code in units (13.4% of code).

0 very complex units (0 lines of code)
1 complex units (197 lines of code)
5 medium complex units (267 lines of code)
15 simple units (516 lines of code)
128 very simple units (1,302 lines of code)

Legend:

51+

26-50

11-25

6-10

1-5

Alternative Visuals

3D view of all units

Conditional Complexity per Extension

51+

26-50

11-25

6-10

1-5

Conditional Complexity per Logical Component

primary logical decomposition

51+

26-50

11-25

6-10

1-5

Most Complex Units

Top 50 most complex units

Unit	# lines	McCabe index	# params
t sub ai_test() in t/modules/autoindex.t	197	40	0
t sub test_header() in t/modules/headers.t	69	15	0
t sub expires_test() in t/modules/expires.t	52	13	0
static int echo_post_chunk_handler() in c-modules/echo_post_chunk/mod_echo_post_chunk.c	65	12	1
t sub verify() in t/apache/byterange3.t	44	12	0
t sub verify() in t/apache/byterange.t	37	11	0
static int random_chunk_handler() in c-modules/random_chunk/mod_random_chunk.c	63	10	1
t sub write_htaccess() in t/modules/authz_core.t	42	10	0
t sub get_rand_time_str() in t/modules/expires.t	30	10	0
static int echo_post_handler() in c-modules/echo_post/mod_echo_post.c	78	8	1
static int input_body_filter_handler() in c-modules/input_body_filter/mod_input_body_filter.c	45	8	5
static int eat_post_handler() in c-modules/eat_post/mod_eat_post.c	37	7	1
static int nntp_like_process_connection() in c-modules/nntp_like/mod_nntp_like.c	31	7	1
t sub test_content() in t/modules/autoindex.t	26	7	0
t sub GetNonce() in t/modules/proxy_balancer.t	26	7	0
t sub convert_to_time() in t/modules/expires.t	22	7	0
static int httpd_test_split_qs_numbers() in c-modules/httpd_test_util.c	22	6	2
t sub test_header2() in t/modules/headers.t	32	6	0
t sub run_fcgi_envvar_request() in t/modules/proxy_fcgi.t	23	6	0
t sub verify() in t/ssl/env.t	23	6	0
sub cwait() in Misc.pm	16	6	0
static int require_any_user() in c-modules/authany/mod_authany.c	21	5	1
static int authany_handler() in c-modules/authany/mod_authany.c	31	5	1
static int memory_track_handler() in c-modules/memory_track/mod_memory_track.c	23	5	1
t $client->connect() in t/modules/proxy_websockets_ssl.t	37	5	0
t sub uds_script() in t/modules/proxy.t	21	5	0
t $client->connect() in t/modules/proxy_websockets.t	35	5	0
t sub expect_chunked() in t/http11/chunked.t	38	5	0
t sub expect_not_chunked() in t/http11/chunked.t	37	5	0
lua function handle() in t/htdocs/modules/lua/websockets.lua	16	5	1
static int fold_handler() in c-modules/fold/mod_fold.c	14	4	1
static authz_status any_check_authorization() in c-modules/authany/mod_authany.c	11	4	3
static int input_body_filter_fixup_handler() in c-modules/input_body_filter/mod_input_body_filter.c	9	4	1
static int list_modules_handler() in c-modules/list_modules/mod_list_modules.c	18	4	1
t sub permutations() in t/modules/authz_core.t	17	4	0
t sub run_fcgi_handler() in t/modules/proxy_fcgi.t	38	4	0
lua function translate_name2() in t/htdocs/modules/lua/translate.lua	15	4	1
function switchtest() in t/htdocs/php/switch4.php	21	4	2
t sub print_result() in t/apache/byterange7.t	12	4	0
t sub set_chunking() in t/apache/limits.t	7	4	0
t sub { !have_min_apache_version() in t/protocol/nntp-like.t	3	4	0
static authn_status authn_check_password() in c-modules/authany/mod_authany.c	6	3	3
static int client_add_filter_header() in c-modules/client_add_filter/mod_client_add_filter.c	13	3	3
static int input_body_filter_response_handler() in c-modules/input_body_filter/mod_input_body_filter.c	13	3	1
t sub check() in t/modules/authz_core.t	18	3	0
t sub check_xbithack() in t/modules/include.t	9	3	0
t sub check_xbithack_etag() in t/modules/include.t	9	3	0
t sub check_result() in t/modules/session.t	29	3	0
t sub set_expect() in t/modules/setenvif.t	20	3	0
t sub write_htaccess() in t/modules/substitute.t	10	3	0