Hi everyone, trying to encode some information about music (a different structure than the harmonex package). I have an earlier implemenation of what I want in python (from a previous project). It heavily uses enums to describe the structure of pitch classes, intervals, chords etc. eg one of them…

Yeah I learned that ElixirLS is just complaining and things work fine when I run with iex -S mix I’m pretty happy with this final solution for now, so leaving it here in case it helps others: defmodule AEnum do defmacro defenum({:__aliases__, _, [name_atom]} = fullname, args, do: block) when i…

Since the order is important, an Elixir/erlang map is not the right structure since order is not defined If the list is known at compile time (ie its static) then you can compile your mappings into functions. For example: defmodule Pitch do @pitches [{"C", 0}, {"D", 2}, ...] for {note, midi_v…

In Elixir this is referred to as an unquote fragment . You may also find this post helpful.

Just to illustrate how to achieve the bi-directional structure you were looking for. defmodule Pitch do list = [ # flats are preferrable to sharps (jazz musician here) {"C", 0}, {"D", 2}, {"E", 4}, {"F", 5}, {"G", 7}, {"A", 9}, {"B", 1}, {"Db", 1}, {"Gb", 6…

[image] kip: for {note, midi_value} <- @pitches do def pitch(unquote(note)), do: unquote(midi_value) def pitch(unquote(midi_value)), do: unquote(note) end Elegant solution. The only one caveat is that since the numbers are not unique you will get a warning saying a previous claus…

[image] kip: Since functions clauses are resolved in lexical order, this implementation does rely on the keys and the values being unique. Yes, you are right and I’m definitely not sure my approach is the best one but I like it for its expressiveness and simplicity.

Spent some time working on @kip ’s solution and ended up with defmodule AEnum do defmacro defenum({:__aliases__, _, [name_atom]} = fullname, args, do: block) when is_list(args) do function_name = String.to_atom String.downcase Atom.to_string(name_atom) max = Enum.max(Enum.map args, fn {_…

[image] vshesh: import Music.Pitch when are you calling this line? If that happens after your code has been compile, you will get that warning. It usually happens in tests or from IEx

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Best way to implement "enum" like python, c, java?

Questions & Help Questions

vshesh January 26, 2021, 9:21pm 3

how are you unquoting outside of a quote do ... end block?