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A static code analysis tool with a focus on code consistency and teaching.
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lib/credo/priority.ex
defmodule Credo.Priority do
@moduledoc """
In Credo each Issue is given a priority to differentiate issues by a second
dimension next to their Category.
"""
alias Credo.Code.Module
alias Credo.Code.Parameters
alias Credo.Code.Scope
alias Credo.SourceFile
@def_ops [:def, :defp, :defmacro]
@many_functions_count 5
def scope_priorities(%SourceFile{} = source_file) do
empty_priorities =
1..length(source_file.lines)
|> Enum.map(fn(_) -> [] end)
priority_list =
source_file
|> Credo.Code.prewalk(&traverse/2, empty_priorities)
base_map =
priority_list
|> make_base_map(source_file)
lookup =
base_map
|> Enum.into(%{})
base_map
|> Enum.map(fn({scope_name, prio}) ->
names = scope_name |> String.split(".")
if names |> List.last |> String.match?(~r/^[a-z]/) do
mod_name = names |> Enum.slice(0..length(names) - 2) |> Enum.join(".")
mod_prio = lookup[mod_name]
{scope_name, prio + mod_prio}
else
{scope_name, prio}
end
end)
|> Enum.into(%{})
end
defp make_base_map(priority_list, %SourceFile{} = source_file) do
priority_list
|> Enum.with_index
|> Enum.map(fn({list, index}) ->
case list do
[] -> nil
_ ->
{_, scope_name} = Scope.name(source_file.ast, line: index + 1)
{scope_name, Enum.sum(list)}
end
end)
|> Enum.reject(&is_nil/1)
end
defp traverse({:defmodule, meta, _} = ast, acc) do
added_prio = priority_for(ast)
{ast, List.update_at(acc, meta[:line] - 1, &(&1 ++ [added_prio]))}
end
for op <- @def_ops do
defp traverse({unquote(op), meta, arguments} = ast, acc) when is_list(arguments) do
added_prio = priority_for(ast)
case arguments do
[{_func_name, _meta, _func_arguments}, _do_block] ->
{ast, List.update_at(acc, meta[:line] - 1, &(&1 ++ [added_prio]))}
_ ->
{ast, acc}
end
end
end
defp traverse(ast, acc) do
{ast, acc}
end
defp priority_for({:defmodule, _, _} = ast) do
if Module.def_count(ast) >= @many_functions_count do
2
else
1
end
end
for op <- @def_ops do
defp priority_for({unquote(op), _, arguments} = ast) when is_list(arguments) do
count = Parameters.count(ast)
cond do
count == 0 -> 0
count in 1..2 -> 1
count in 3..4 -> 2
true -> 3
end
end
end
end