This module provides functions to traverse an AST with a %Context{}.

Examples

The following example shows the %Context{} for the definition of MyApp.Bar.bar/1.

iex> alias Rewrite.Source
...> alias Recode.Context
...>
...> code = """
...> defmodule MyApp.Foo do
...>   def foo, do: :foo
...> end
...>
...> defmodule MyApp.Bar do
...>   alias MyApp.Foo
...>
...>   def bar(x) do
...>     {Foo.foo(), x}
...>   end
...> end
...> """
...> 
...> context = 
...>   code 
...>   |> Source.Ex.from_string()
...>   |> Source.get(:quoted)
...>   |> Zipper.zip()
...>   |> Context.traverse(nil, fn
...>     zipper, context, nil ->
...>       case context.definition do
...>         {{:def, :bar, 1}, _meta} -> {zipper, context, context}
...>         _def -> {zipper, context, nil}
...>       end
...>     zipper, context, acc ->
...>       {zipper, context, acc}
...>   end)
...>   |> elem(1)
...> 
...> context |> Map.from_struct() |> Map.keys() |> Enum.sort()
[
  :aliases,
  :assigns, 
  :definition, 
  :doc, 
  :impl,
  :imports, 
  :module, 
  :moduledoc, 
  :node, 
  :requirements, 
  :spec, 
  :usages
]