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#
# lkn.core: an entity-component-system (ecs) implementation for lyxan
# Copyright (C) 2017 Thomas Letan <contact@thomasletan.fr>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
defmodule Lkn.Core.Component do
alias Lkn.Core.Specs
@type state :: any
@callback init_state(Lkn.Core.Entity.k) :: {:ok, state} | :error
defmacro defcomponent(name, do: block) do
state_type = quote do Lkn.Core.Component.state end
key_type = quote do Lkn.Core.Component.k end
key_to_name = quote do
&(Lkn.Core.Name.component(&1, unquote(name)))
end
quote do
defmodule unquote(name) do
unquote(Specs.gen_server_from_specs(block, key_type, key_to_name, state_type))
def system do
@system
end
defmacro __using__(_) do
quote do
defmodule State do
defstruct [
:entity_key,
:state,
]
@type t :: %State{
entity_key: Lkn.Core.Entity.k,
state: Lkn.Core.Component.state,
}
end
@behaviour unquote(__MODULE__)
@behaviour Lkn.Core.Component
use GenServer
alias Lkn.Core.Entity
alias Lkn.Core.Name
alias Lkn.Core.Properties
def specs do
unquote(__MODULE__)
end
@spec start_link(Entity.k) :: GenServer.on_start
def start_link(entity_key) do
GenServer.start_link(__MODULE__, entity_key, name: Name.component(entity_key, unquote(__MODULE__)))
end
def init(entity_key) do
{:ok, s} = init_state(entity_key)
{:ok, %State{entity_key: entity_key, state: s}}
end
@spec read(Entity.k, Properties.prop) :: Option.t(Properties.value)
defp read(entity_key, p) do
Properties.read(entity_key, p)
end
@spec write(Entity.k, Properties.prop, Properties.value) :: :ok
def write(entity_key, p, v) do
Properties.write(entity_key, p, v)
end
def handle_cast({:spec, {name, args}}, state) do
s = :erlang.apply(__MODULE__, name, [state.entity_key|args] ++ [state.state])
{:noreply, %State{state|state: s}}
end
def handle_call({:spec, {name, args}}, _call, state) do
{res, s} = :erlang.apply(__MODULE__, name, [state.entity_key|args] ++ [state.state])
{:reply, res, %State{state|state: s}}
end
end
end
end
end
end
end
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