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A static code analysis tool with a focus on code consistency and teaching.

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credo lib credo check consistency parameter_pattern_matching position_collector.ex
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lib/credo/check/consistency/parameter_pattern_matching/position_collector.ex 

defmodule Credo.Check.Consistency.ParameterPatternMatching.PositionCollector do

  use Credo.Check.CodePattern



  alias Credo.Code.Module



  def property_value, do: nil



  def property_value_for(%SourceFile{ast: ast, filename: filename}, _params) do

    Credo.Code.prewalk(ast, &traverse(&1, &2, filename))

  end



  defp traverse({:defmodule, _meta, [{:__aliases__, _, _name_arr}, _arguments]} = ast, property_values, filename) do

    new_property_values =

      ast

      |> Module.defs

      |> Enum.flat_map(&(property_values_for_def(&1, filename)))



    {:ast, property_values ++ new_property_values}

  end



  defp traverse(ast, property_values, _filename) do

    {ast, property_values}

  end



  defp property_values_for_def({:def, _, [{_name, _, parameters}, _]}, filename) when is_list(parameters) do

    parameters

    |> Enum.map(&(property_values_for_parameter(&1, filename)))

    |> Enum.reject(&is_nil/1)

  end

  defp property_values_for_def(_, _), do: []



  defp property_values_for_parameter({:=, _, [{name, meta, nil}, _rhs]} = _vals, filename) when is_atom(name) do

    PropertyValue.for(:before, filename: filename, line_no: meta[:line])

  end

  defp property_values_for_parameter({:=, _, [_lhs, {name, meta, nil}]} = _vals, filename) when is_atom(name) do

    PropertyValue.for(:after, filename: filename, line_no: meta[:line])

  end

  defp property_values_for_parameter(_, _), do: nil

end