View Source Credo.Check.Refactor.ABCSize (Credo v1.7.7-rc.0)

Basics

This check is disabled by default.

Learn how to enable it via .credo.exs.

This check is tagged :controversial

This means that this check is more opinionated than others and not for everyone's taste.

This check has a base priority of 0 and works with any version of Elixir.

Explanation

The ABC size describes a metric based on assignments, branches and conditions.

A high ABC size is a hint that a function might be doing "more" than it should.

As always: Take any metric with a grain of salt. Since this one was originally introduced for C, C++ and Java, we still have to see whether or not this can be a useful metric in a declarative language like Elixir.

Check-Specific Parameters

Use the following parameters to configure this check:

:max_size

The maximum ABC size a function should have.

This parameter defaults to 30.

:excluded_functions

All functions listed will be ignored.

This parameter defaults to [].

General Parameters

Like with all checks, general params can be applied.

Parameters can be configured via the .credo.exs config file.

Summary

Functions

abc_size_for(arg, excluded_functions)

Returns the ABC size for the block inside the given AST, which is expected to represent a function or macro definition.

Functions

Link to this function

abc_size_for(arg, excluded_functions)

View Source

Returns the ABC size for the block inside the given AST, which is expected to represent a function or macro definition.

iex> {:def, [line: 1],
...>   [
...>     {:first_fun, [line: 1], nil},
...>     [do: {:=, [line: 2], [{:x, [line: 2], nil}, 1]}]
...>   ]
...> } |> Credo.Check.Refactor.ABCSize.abc_size
1.0