Cyclomatic Complexity of R Code

Description

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.

Calculate the cyclomatic complexity of an R function or expression.

Usage

cyclocomp(expr)

cyclocomp_q(expr)

Arguments

Value

Integer scalar, the cyclomatic complexity of the expression.

See Also

Useful links:

• https://github.com/gaborcsardi/cyclocomp

• Report bugs at https://github.com/gaborcsardi/cyclocomp/issues

Other cyclomatic complexity: cyclocomp_package_dir(), cyclocomp_package()

Examples

## Supply a function
cyclocomp(
  function(arg) { calulate(this); and(that) }
)
cyclocomp(ls)
cyclocomp(cyclocomp)

## Or a quoted expression
cyclocomp(quote( if (condition) "foo" else "bar" ))

## cyclocomp_q quotes the expression for you
cyclocomp_q(while (condition) { loop })

## Complexity of individual control flow constructs
cyclocomp(quote({
  if (condition) this
}))

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

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

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

cyclocomp(quote({
  repeat expr
}))

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

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

Cyclomatic complexity of the objects in an installed package

Description

Note that the package must be installed.

Usage

cyclocomp_package(package)

Arguments

Value

Data frame with two columns: name and cyclocomp.

See Also

Other cyclomatic complexity: cyclocomp_package_dir(), cyclocomp()

Examples

## They might take a while to run
## Not run: 
cyclocomp_package("grDevices")
cyclocomp_package("methods")

## End(Not run)

Cyclomatic complexity of a local package

Description

Automatically builds the package and installs it to a temporary directory.

Usage

cyclocomp_package_dir(path = ".")

Arguments

Value

Data frame with two columns: name and cyclocomp.

See Also

Other cyclomatic complexity: cyclocomp_package(), cyclocomp()