# cyclocomp v1.1.0

0

0th

Percentile

## Cyclomatic Complexity of R Code

Cyclomatic complexity is a software metric (measurement), used to indicate the complexity of a program. It is a quantitative measure of the number of linearly independent paths through a program's source code. It was developed by Thomas J. McCabe, Sr. in 1976.

# cyclocomp

Cyclomatic Complexity of R Code

Cyclomatic complexity is a software metric (measurement), used to indicate the complexity of a program. It is a quantitative measure of the number of linearly independent paths through a program's source code. It was developed by Thomas J. McCabe, Sr. in 1976.

## Installation

devtools::install_github("MangoTheCat/cyclocomp")


## Usage

library(cyclocomp)


cyclocomp takes quoted R expressions or function objects, and returns a single integer, the cyclomatic complexity of the expression or function.

cyclocomp(quote( if (condition) "foo" else "bar" ))

#> [1] 2

cyclocomp(quote( while (condition) { loop } ))

#> [1] 3

cyclocomp(
function(arg) { calulate(this); and(that) }
)

#> [1] 1

cyclocomp(ls)

#> [1] 10

cyclocomp(cyclocomp)

#> [1] 1


Some more examples for the R control structures. A simple if first:

cyclocomp(quote({
if (condition) this
}))

#> [1] 2


An if with an else branch:

cyclocomp(quote({
if (condition) this else that
}))

#> [1] 2


Loops:

cyclocomp(quote({
for (var in seq) expr
}))

#> [1] 3

cyclocomp(quote({
while (cond) expr
}))

#> [1] 3

cyclocomp(quote({
repeat expr
}))

#> [1] 2


break and next statements add to the complexity:

cyclocomp(quote({
for (var in seq) {
this
break
that
}
}))

#> [1] 4

cyclocomp(quote({
for (var in seq) {
this
next
that
}
}))

#> [1] 4


Multiple (explicit or implicit) return calls also add to the complexity:

f <- function(arg) {
if (arg) {
return("this")
} else {
return("that")
}
"Otherwise return me"
}
cyclocomp(f)

#> [1] 4


## Functions in cyclocomp

 Name Description cyclocomp_package Cyclomatic complexity of the objects in an installed package cyclocomp Cyclomatic Complexity of R Code cyclocomp_package_dir Cyclomatic complexity of a local package No Results!