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
...> """
...> 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
...> """
...> |> 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) |> Map.put(:node, nil)
%Context{
  node: nil,
  aliases: [
    {MyApp.Foo,
     [
       trailing_comments: [],
       leading_comments: [],
       end_of_expression: [newlines: 2, line: 6, column: 18],
       line: 6,
       column: 3
     ], nil}
  ],
  assigns: %{},
  definition:
    {{:def, :bar, 1},
     [
       trailing_comments: [],
       leading_comments: [],
       do: [line: 8, column: 14],
       end: [line: 10, column: 3],
       line: 8,
       column: 3
     ]},
  imports: [],
  module:
    {MyApp.Bar,
     [
       trailing_comments: [],
       leading_comments: [],
       do: [line: 5, column: 21],
       end: [line: 11, column: 1],
       line: 5,
       column: 1
     ]},
  requirements: [],
  usages: []
}