59 lines
1.6 KiB
Elixir
59 lines
1.6 KiB
Elixir
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defmodule RPG do
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defmodule Character do
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defstruct health: 100, mana: 0
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end
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defmodule LoafOfBread do
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defstruct []
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end
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defmodule ManaPotion do
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defstruct strength: 10
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end
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defmodule Poison do
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defstruct []
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end
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defmodule EmptyBottle do
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defstruct []
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end
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# Add code to define the protocol and its implementations below here...
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defprotocol Edible do
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@moduledoc """
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Protocol definition for interaction between Characters and Items
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"""
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@type item() :: LoafOfBread.t() | ManaPotion.t() | Poison.t() | EmptyBottle.t()
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@spec eat(item(), Character.t()) :: {nil | item(), Character.t()}
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def eat(item, character)
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end
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defimpl Edible, for: LoafOfBread do
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@moduledoc """
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Edible implimentation for LoafOfBread
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"""
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@spec eat(LoafOfBread.t(), Character.t()) :: {nil, Character.t()}
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def eat(%LoafOfBread{}, %Character{health: health} = character),
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do: {nil, %{character | health: health + 5}}
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end
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defimpl Edible, for: ManaPotion do
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@moduledoc """
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Edible implimentation for ManaPotion
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"""
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@spec eat(ManaPotion.t(), Character.t()) :: {EmptyBottle.t(), Character.t()}
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def eat(%ManaPotion{strength: strength}, %Character{mana: mana} = character),
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do: {%EmptyBottle{}, %{character | mana: mana + strength}}
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end
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defimpl Edible, for: Poison do
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@moduledoc """
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Edible implimentation for Poison
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"""
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@spec eat(Poison.t(), Character.t()) :: {EmptyBottle.t(), Character.t()}
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def eat(%Poison{}, %Character{} = character),
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do: {%EmptyBottle{}, %{character | health: 0}}
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end
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end
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