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ex_ast lib ex_ast comments.ex
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lib/ex_ast/comments.ex 

defmodule ExAST.Comments do

  @moduledoc """

  Extracts comments from Elixir source while preserving source positions.

  """



  alias ExAST.Comment



  @spec extract(String.t()) :: [Comment.t()]

  def extract(source) when is_binary(source) do

    {_ast, comments} = Code.string_to_quoted_with_comments!(source)



    Enum.map(comments, fn comment ->

      %Comment{

        text: Map.get(comment, :text, ""),

        line: Map.get(comment, :line),

        column: Map.get(comment, :column),

        previous_eol_count: Map.get(comment, :previous_eol_count),

        next_eol_count: Map.get(comment, :next_eol_count)

      }

    end)

  end



  @spec text(String.t()) :: String.t()

  def text(source) when is_binary(source) do

    source

    |> extract()

    |> Enum.map_join("\n", & &1.text)

  end

end