OK, thank you for confirming me unquote is not really “shortcutable”.
But what is the “best” way to shortcut Macro.escape(x) as e(x) ?
fgallaire
1
alexiss
defmodule Shortcuts do
def sigil_x(quoted, []), do: Macro.escape(quoted)
end
defmodule Test do
import Shortcuts
defmacro me(value) do
quote do
IO.inspect(unquote(~x(value)))
end
end
end
0
josevalim
Creator of Elixir
josevalim
Creator of Elixir
fgallaire
josevalim
Creator of Elixir
That’s not going to work either, you can’t invoke functions inside pattern matching. In this case, if you want to match on an escaped expression, you can use a macro and it will work without imports or separate modules, as long as the macro is defined before you use it:
defmacrop e(x), do: Macro.escape(x)
def func(e(something)), do: :things
However, I have to say that matching on escaped expressions is very awkward, and that likely won’t work the way you are expecting.
At this point, it would be better if you gave us the full specification of the problem, instead of giving only bit by bit, which makes it very hard for us to provide precise feedback.
1
fgallaire
Thanks @josevalim, it’s not awkward, it’s a way to do things, as I’m a beginner I’m testing all the ways to do things in Elixir (and Erlang) in a little project I will release soon.
BTW I still have the undefined function e/1 when matching against a macro defined in the same module.
0
alexiss
is a sigil really a plus for that purpose
Sigils is a one way to ‘shortcut’ something, another way is a function with one-letter name (as @josevalim pointed). As I understand, sigils are more preferable to do a compile-time work.
0