An implementation of Rewrite.Filetype to handle Elixir source files.

The module uses the sourceror package to provide an extended AST representation of an Elixir file.

Ex extends the source by the key :quoted.

Updating and resyncing :quoted

When :quoted becomes updated, content becomes formatted to the Elixir source code. To keep the code in :content in sync with the AST in :quoted, the new code is parsed to a new :quoted. That means that Source.update(source, :quoted, quoted) also updates the AST.

The resyncing of :quoted can be suppressed with the option resync_quoted: false.

Examples

iex> source = Source.Ex.from_string("Enum.reverse(list)")
iex> Source.get(source, :quoted)
{{:., [trailing_comments: [], line: 1, column: 5],
  [
    {:__aliases__,
     [
       trailing_comments: [],
       leading_comments: [],
       last: [line: 1, column: 1],
       line: 1,
       column: 1
     ], [:Enum]},
    :reverse
  ]},
 [
   trailing_comments: [],
   leading_comments: [],
   closing: [line: 1, column: 18],
   line: 1,
   column: 6
 ], [{:list, [trailing_comments: [], leading_comments: [], line: 1, column: 14], nil}]}
iex> quoted = Code.string_to_quoted!("""
...> defmodule MyApp.New do
...>   def      foo do
...>   :foo
...> end
...> end
...> """)
iex> source = Source.update(source, :quoted, quoted)
iex> Source.updated?(source)
true
iex> Source.get(source, :content)
"""
defmodule MyApp.New do
  def foo do
    :foo
  end
end
"""
iex> Source.get(source, :quoted) == quoted
false

Without resyncing :quoted:

iex> project = Rewrite.new(filetypes: [{Source.Ex, resync_quoted: false}])
iex> path = "test/fixtures/source/simple.ex"
iex> project = Rewrite.read!(project, path)
iex> source = Rewrite.source!(project, path)
iex> quoted = Code.string_to_quoted!("""
...> defmodule MyApp.New do
...>   def      foo do
...>   :foo
...> end
...> end
...> """)
iex> source = Source.update(source, :quoted, quoted)
iex> Source.get(source, :quoted) == quoted
true