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credo
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A static code analysis tool with a focus on code consistency and teaching.
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lib/credo/code/scope.ex
defmodule Credo.Code.Scope do
@moduledoc """
This module provides helper functions to determine the scope name at a certain
point in the analysed code.
"""
alias Credo.Code.Block
alias Credo.Code.Module
@def_ops [:def, :defp, :defmacro]
def mod_name(nil), do: nil
def mod_name(scope_name) do
names = scope_name |> String.split(".")
if names |> List.last |> String.match?(~r/^[a-z]/) do
names |> Enum.slice(0..length(names)-2) |> Enum.join(".")
else
scope_name
end
end
@doc """
Returns the scope for the given line as a tuple consisting of the call to
define the scope (`:defmodule`, `:def`, `:defp` or `:defmacro`) and the
name of the scope.
Examples:
{:defmodule, "Foo.Bar"}
{:def, "Foo.Bar.baz"}
"""
def name(_ast, [line: 0]), do: nil
def name(ast, [line: line]) do
result =
case find_scope(ast, line, [], nil) do
nil -> name(ast, line: line - 1)
{op, list} -> {op, Enum.join(list, ".")}
end
result || {nil, ""}
end
# Returns a List for the scope name
defp find_scope({:__block__, _meta, arguments}, line, name_list, last_op) do
arguments
|> Enum.find_value(&find_scope(&1, line, name_list, last_op))
end
defp find_scope({:defmodule, meta, [{:__aliases__, _, module_name}, arguments]}, line, name_list, _last_op) do
name_list = name_list ++ module_name
cond do
meta[:line] == line -> {:defmodule, name_list}
meta[:line] > line -> nil
true -> arguments |> Block.do_block_for! |> find_scope(line, name_list, :defmodule)
end
end
for op <- @def_ops do
defp find_scope({unquote(op) = op, meta, arguments} = ast, line, name_list, _last_op) when is_list(arguments) do
fun_name = Module.def_name(ast)
name_list = name_list ++ [fun_name]
cond do
meta[:line] == line -> {op, name_list}
meta[:line] > line -> nil
true -> arguments |> Block.do_block_for! |> find_scope(line, name_list, op)
end
end
end
defp find_scope({_atom, meta, _arguments}, line, name_list, last_op) do
if meta[:line] == line do
{last_op, name_list}
else
nil
end
end
defp find_scope(_, _line, _name_list, _last_op), do: nil
end