apache / couchdb - 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 931 units with 15,384 lines of code in units (10.0% of code).

9 very complex units (2,165 lines of code)
10 complex units (1,380 lines of code)
47 medium complex units (2,495 lines of code)
89 simple units (2,674 lines of code)
776 very simple units (6,670 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
static int re_parse_term() in src/couch_quickjs/quickjs/libregexp.c	446	133	2
static intptr_t lre_exec_backtrack() in src/couch_quickjs/quickjs/libregexp.c	396	108	7
double js_atod() in src/couch_quickjs/quickjs/dtoa.c	245	97	5
int unicode_from_utf8() in src/couch_quickjs/quickjs/cutils.c	52	68	3
static JSValue js_printf_internal() in src/couch_quickjs/quickjs/quickjs-libc.c	193	62	4
int main() in src/couch_quickjs/quickjs/run-test262.c	176	62	2
int run_test() in src/couch_quickjs/quickjs/run-test262.c	212	60	2
int main() in src/couch_quickjs/quickjs/qjsc.c	263	55	2
static JSValue js_os_exec() in src/couch_quickjs/quickjs/quickjs-libc.c	182	53	4
static int eval_buf() in src/couch_quickjs/quickjs/run-test262.c	177	50	10
static int unicode_decomp_entry() in src/couch_quickjs/quickjs/libunicode.c	136	49	6
void load_config() in src/couch_quickjs/quickjs/run-test262.c	150	46	2
int js_dtoa() in src/couch_quickjs/quickjs/dtoa.c	179	45	6
int lre_parse_escape() in src/couch_quickjs/quickjs/libregexp.c	103	40	2
static int get_class_atom() in src/couch_quickjs/quickjs/libregexp.c	104	38	4
static JSValue js_std_urlGet() in src/couch_quickjs/quickjs/quickjs-libc.c	136	34	4
static int lre_case_conv_entry() in src/couch_quickjs/quickjs/libunicode.c	89	30	5
static __maybe_unused void lre_dump_bytecode() in src/couch_quickjs/quickjs/libregexp.c	114	30	2
int unicode_prop() in src/couch_quickjs/quickjs/libunicode.c	192	27	2
int unicode_script() in src/couch_quickjs/quickjs/libunicode.c	110	25	3
static int parse_unicode_property() in src/couch_quickjs/quickjs/libregexp.c	89	25	4
static int re_parse_char_class() in src/couch_quickjs/quickjs/libregexp.c	82	22	2
static void mpb_shr_round() in src/couch_quickjs/quickjs/dtoa.c	81	22	3
static BOOL re_need_check_advance() in src/couch_quickjs/quickjs/libregexp.c	48	21	2
static int js_os_poll() in src/couch_quickjs/quickjs/quickjs-libc.c	99	21	1
static int unicode_case1() in src/couch_quickjs/quickjs/libunicode.c	58	20	2
static int js_os_poll() in src/couch_quickjs/quickjs/quickjs-libc.c	81	20	1
void rqsort() in src/couch_quickjs/quickjs/cutils.c	89	19	5
static int re_parse_captures() in src/couch_quickjs/quickjs/libregexp.c	48	18	3
void build_tables() in src/couch_quickjs/quickjs/dtoa.c	76	17	1
int cr_regexp_canonicalize() in src/couch_quickjs/quickjs/libunicode.c	68	16	2
static int unicode_prop_ops() in src/couch_quickjs/quickjs/libunicode.c	73	16	2
function runShow() in share/server/render.js	36	16	3
static ERL_NIF_TERM pread_nif() in src/couch/priv/couch_cfile/couch_cfile.c	52	15	3
static int re_parse_group_name() in src/couch_quickjs/quickjs/libregexp.c	52	15	3
int skip_comments() in src/couch_quickjs/quickjs/run-test262.c	35	15	3
fitnessAndQualityParsed : function() in share/server/mimeparse.js	25	15	2
public boolean equals() in nouveau/src/main/java/org/apache/couchdb/nouveau/api/Range.java	18	15	1
private Query deserializeNode() in nouveau/src/main/java/org/apache/couchdb/nouveau/lucene9/QueryDeserializer.java	65	15	3
private static Document toDocument() in nouveau/src/main/java/org/apache/couchdb/nouveau/lucene9/Lucene9Index.java	47	15	2
int unicode_normalize() in src/couch_quickjs/quickjs/libunicode.c	61	14	6
static inline exchange_f exchange_func() in src/couch_quickjs/quickjs/cutils.c	33	14	2
static ERL_NIF_TERM seek_nif() in src/couch/priv/couch_cfile/couch_cfile.c	40	13	3
static ssize_t linein() in src/couch_quickjs/c_src/couchjs.c	43	13	2
int cr_op() in src/couch_quickjs/quickjs/libunicode.c	48	13	6
public void serialize() in nouveau/src/main/java/org/apache/couchdb/nouveau/lucene9/QuerySerializer.java	111	13	3
int main() in src/couch_quickjs/c_src/couchjs.c	47	12	2
static int unicode_general_category1() in src/couch_quickjs/quickjs/libunicode.c	49	12	2
static void heapsortx() in src/couch_quickjs/quickjs/cutils.c	30	12	5
static int re_is_simple_quantifier() in src/couch_quickjs/quickjs/libregexp.c	37	12	2