Is there a complete Elixir AST reference?

al2o3cr · April 14, 2021, 12:29am

The parser to handle alias Foo.{Bar, Baz} is:

elixir-lang/elixir/blob/b498c3790e570e341f24ae8e7b73b0d45eae9279/lib/elixir/src/elixir_parser.yrl#L457-L460


dot_alias -> alias : build_alias('$1').
dot_alias -> matched_expr dot_op alias : build_dot_alias('$2', '$1', '$3').
dot_alias -> matched_expr dot_op open_curly '}' : build_dot_container('$2', '$1', [], []).
dot_alias -> matched_expr dot_op open_curly container_args close_curly : build_dot_container('$2', '$1', '$4', newlines_pair('$3', '$5')).

build_dot_alias handles actually creating the AST structure.

The code to handle that AST is:

github.com

elixir-lang/elixir/blob/b498c3790e570e341f24ae8e7b73b0d45eae9279/lib/elixir/src/elixir_expand.erl#L50-L62


expand({Kind, Meta, [{{'.', _, [Base, '{}']}, _, Refs} | Rest]}, E)
    when Kind == alias; Kind == require; Kind == import ->
  case Rest of
    [] ->
      expand_multi_alias_call(Kind, Meta, Base, Refs, [], E);
    [Opts] ->
      case lists:keymember(as, 1, Opts) of
        true ->
          form_error(Meta, E, ?MODULE, as_in_multi_alias_call);
        false ->
          expand_multi_alias_call(Kind, Meta, Base, Refs, Opts, E)
      end
  end;