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A static code analysis tool with a focus on code consistency and teaching.
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lib/credo/check/config_comment_finder.ex
defmodule Credo.Check.ConfigCommentFinder do
@moduledoc false
# This check is used internally by Credo.
#
# It traverses the given codebase to find `Credo.Check.ConfigComment`
# compatible comments, which control Credo's behaviour.
alias Credo.Check.ConfigComment
alias Credo.SourceFile
@doc false
def run(source_files) when is_list(source_files) do
source_files
|> Task.async_stream(&find_and_set_in_source_file/1, ordered: false, timeout: :infinity)
|> Enum.map(fn {:ok, value} -> value end)
|> Enum.reject(&is_nil/1)
end
def find_and_set_in_source_file(%Credo.SourceFile{status: :valid} = source_file) do
case find_config_comments(source_file) do
[] -> nil
config_comments -> {source_file.filename, config_comments}
end
end
def find_and_set_in_source_file(_), do: nil
defp find_config_comments(source_file) do
source = SourceFile.source(source_file)
if source =~ config_comment_format() do
case Code.string_to_quoted_with_comments(source) do
{:ok, _ast, comments} -> extract_config_comments(comments)
{:error, _} -> []
end
else
[]
end
end
defp extract_config_comments(comments) do
Enum.flat_map(comments, fn %{text: text, line: line_no} ->
case Regex.run(config_comment_format(), text) do
nil -> []
[_, instruction, param_string] -> [ConfigComment.new(instruction, param_string, line_no)]
end
end)
end
# moved to private function due to deprecation of regexes
# in module attributes in Elixir 1.19
defp config_comment_format, do: ~r/#\s*credo\:([\w\-\:]+)\s*(.*)/im
end