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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/check/find_lint_attributes.ex
defmodule Credo.Check.FindLintAttributes do
@moduledoc """
"""
@explanation nil
use Credo.Check, run_on_all: true, base_priority: :high
alias Credo.SourceFile
alias Credo.Check.CodeHelper
alias Credo.Check.LintAttribute
@doc false
def run(source_files, _params) when is_list(source_files) do
source_files
|> Enum.map(&find_and_set_in_source_file/1)
end
def find_and_set_in_source_file(source_file) do
lint_attributes =
Credo.Code.traverse(source_file, &traverse(&1, &2, source_file))
%SourceFile{source_file | lint_attributes: lint_attributes}
end
defp traverse({:defmodule, _meta, _arguments} = ast, attribute_list, source_file) do
found_attributes =
ast
|> CodeHelper.calls_in_do_block()
|> process_calls(nil, [])
|> Enum.map(fn(lint) ->
{_, scope} = CodeHelper.scope_for(source_file, line: lint.line)
%LintAttribute{lint | scope: scope}
end)
{ast, attribute_list ++ found_attributes}
end
defp traverse(ast, attribute_list, _source_file) do
{ast, attribute_list}
end
def process_calls([], _, attribute_list), do: attribute_list
def process_calls([head|tail], nil, attribute_list) do
current_lint_attribute =
case head do
{:@, _, [{:lint, _, _}]} = ast ->
LintAttribute.from_ast(ast)
_ ->
nil
end
process_calls(tail, current_lint_attribute, attribute_list)
end
def process_calls([head|tail], current_lint_attribute, attribute_list) do
case head do
# a lint attribute was found
{:@, meta, [{:lint, _, arguments}]} ->
# TODO: warn that a new lint attribute was read while one was still active
process_calls(tail, %LintAttribute{meta: meta, arguments: arguments}, attribute_list)
# another module attribute was found
{:@, _meta, _} ->
process_calls(tail, current_lint_attribute, attribute_list)
# an operation was found (at the module level)
{op, meta, arguments} when is_atom(op) and is_list(arguments) ->
attribute_list = [%LintAttribute{current_lint_attribute | line: meta[:line]} | attribute_list]
process_calls(tail, nil, attribute_list)
_ ->
process_calls(tail, current_lint_attribute, attribute_list)
end
end
end