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reach lib reach source span.ex
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lib/reach/source/span.ex 

defmodule Reach.Source.Span do

  @moduledoc "Source span metadata used by lowered plugin AST and Reach IR nodes."



  @type t :: %__MODULE__{

          file: String.t() | nil,

          start_line: pos_integer() | nil,

          start_col: pos_integer() | nil,

          end_line: pos_integer() | nil,

          end_col: pos_integer() | nil

        }



  defstruct [:file, :start_line, :start_col, :end_line, :end_col]



  def from_meta(meta, file) when is_list(meta) do

    case meta[:line] do

      nil ->

        nil



      line ->

        %__MODULE__{

          file: file,

          start_line: line,

          start_col: meta[:column] || 1,

          end_line: nil,

          end_col: nil

        }

    end

  end



  def from_meta(_, _), do: nil



  def to_map(nil), do: nil



  def to_map(%__MODULE__{} = span) do

    %{

      file: span.file,

      start_line: span.start_line,

      start_col: span.start_col,

      end_line: span.end_line,

      end_col: span.end_col

    }

  end



  def to_map(%{} = span), do: span

end