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Fix inaccurate typespecs (#7)

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1. `rating`, `rating_deviation`, and `rating_interval` all omit the
   possibility of receiving a `nil` as the second argument.
2. Writing out `Result.t()`  results in `dialyzer` looking for
   `Elixir.Result.t()`, instead of calling the local
   `Elixir.Glicko.Result.t()`.
This commit is contained in:
Mikael Muszynski 2020-02-23 23:14:58 +01:00 committed by GitHub
parent 93c09273d2
commit 28cea24d66
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 6 additions and 6 deletions
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6
lib/glicko/player.ex
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@ -143,7 +143,7 @@ defmodule Glicko.Player do
@doc """
A version agnostic method for getting a player's rating.
"""
@spec rating(player :: t, as_version :: version) :: rating
@spec rating(player :: t, as_version :: version | nil) :: rating
def rating(player, as_version \\ nil)
def rating({rating, _}, nil), do: rating
def rating({rating, _, _}, nil), do: rating
@ -155,7 +155,7 @@ defmodule Glicko.Player do
@doc """
A version agnostic method for getting a player's rating deviation.
"""
@spec rating_deviation(player :: t, as_version :: version) :: rating_deviation
@spec rating_deviation(player :: t, as_version :: version | nil) :: rating_deviation
def rating_deviation(player, as_version \\ nil)
def rating_deviation({_, rating_deviation}, nil), do: rating_deviation
def rating_deviation({_, rating_deviation, _}, nil), do: rating_deviation
@ -192,7 +192,7 @@ defmodule Glicko.Player do
When a player has a low RD, the interval would be narrow, so that we would
be 95% confident about a player’s strength being in a small interval of values.
"""
@spec rating_interval(player :: t) :: {rating_low :: float, rating_high :: float}
@spec rating_interval(player :: t, as_version :: version | nil) :: {rating_low :: float, rating_high :: float}
def rating_interval(player, as_version \\ nil) do
{
rating(player, as_version) - rating_deviation(player, as_version) * 2,

6
lib/glicko/result.ex
View File

@ -52,18 +52,18 @@ defmodule Glicko.Result do
@doc """
Convenience function for accessing an opponent's rating.
"""
@spec opponent_rating(result :: Result.t()) :: Player.rating()
@spec opponent_rating(result :: t()) :: Player.rating()
def opponent_rating(_result = {rating, _, _}), do: rating
@doc """
Convenience function for accessing an opponent's rating deviation.
"""
@spec opponent_rating_deviation(result :: Result.t()) :: Player.rating_deviation()
@spec opponent_rating_deviation(result :: t()) :: Player.rating_deviation()
def opponent_rating_deviation(_result = {_, rating_deviation, _}), do: rating_deviation
@doc """
Convenience function for accessing the score.
"""
@spec score(result :: Result.t()) :: score
@spec score(result :: t()) :: score
def score(_result = {_, _, score}), do: score
end