Modifying AST of Elixir module before compiling

user_1087469 0
Viewed 714

Hello I'd like to build a library that replaces certain function calls with other function calls.

module A do
  def wrapper
    B.foo
  end
end

In the compiled program A.wrapper will actually call B.baz. I already stumbled upon the @before_compile callback but don't seem to get how I can change the AST of the calling module.

So all I got is this

module A do
  use Modifier
  @before_compile Modifier

  def wrapper
    B.foo
  end
end

defmodule Modifier do
  defmacro __before_compile__(env) do
    # Now what?
  end
end
elixir metaprogramming
2 Answers

Verify if the @on_definition attribute serves your purposes here. Most probably it will.

user_14835030
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