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defmodule Lkn.Core.Specs do
@moduledoc false
def var_name(namestr) do
{String.to_atom(namestr), [], nil}
end
defp check_specs(casts, calls, _legit, keywords) do
allow_impl = Keyword.get(keywords, :allow_impl, false)
allow_specs = Keyword.get(keywords, :allow_specs, true)
Enum.map(casts ++ calls,
&(case &1 do
{_, _} -> if !allow_impl do raise "Cannot define an implementation here" end
_ -> if !allow_specs do raise "Cannot require specs implementation here" end
end))
end
def gen_server_from_specs(block, key_type, key_to_name, state_type, keywords \\ []) do
block = case block do
{:__block__, _, x} -> x
x -> [x]
end
{casts, calls, legit} = parse_specs(block, [], [], [])
check_specs(casts, calls, legit, keywords)
impl_suffix = Keyword.get(keywords, :impl_suffix, "")
key_name = Keyword.get(keywords, :key_name, var_name("key"))
additional_args = Keyword.get(keywords, :additional_args, [])
casts_client = Enum.map(casts, &(cast_client(key_name, key_type, key_to_name, &1)))
calls_client = Enum.map(calls, &(call_client(key_name, key_type, key_to_name, &1)))
casts_behaviour = Enum.map(casts, &(cast_server(&1, key_name, key_type, additional_args, state_type, impl_suffix)))
calls_behaviour = Enum.map(calls, &(call_behaviour(&1, key_name, key_type, additional_args, state_type)))
quote do
unquote(legit)
unquote(casts_client)
unquote(calls_client)
unquote(casts_behaviour)
unquote(calls_behaviour)
end
end
defp cast_client(key_name, key_type, key_to_name, cast) do
cast = case cast do
{cast, _} -> cast
cast -> cast
end
name = cast.fun.name
cast_doc = if cast.doc != :none do
quote do
@doc unquote(cast.doc)
end
end
arglist = Enum.map(cast.fun.arguments, &(&1.name))
arglistcl = [key_name|arglist]
argtypes = [key_type|Enum.map(cast.fun.arguments, &(&1.type))]
quote do
unquote(cast_doc)
@spec unquote({name, [], argtypes}) :: :ok
def unquote({name, [], arglistcl}) do
GenServer.cast(unquote(key_to_name).(unquote(key_name)),
{:spec, {unquote(name), unquote(arglist)}})
end
end
end
defp call_client(key_name, key_type, key_to_name, call) do
name = call.fun.name
call_doc = if call.doc != :none do
quote do
@doc unquote(call.doc)
end
end
arglist = Enum.map(call.fun.arguments, &(&1.name))
arglistcl = [key_name|arglist]
argtypes = [key_type|Enum.map(call.fun.arguments, &(&1.type))]
quote do
unquote(call_doc)
@spec unquote({name, [], argtypes}) :: unquote(call.ret)
def unquote({name, [], arglistcl}) do
GenServer.call(unquote(key_to_name).(unquote(key_name)),
{:spec, {unquote(name), unquote(arglist)}})
end
end
end
defp cast_server({cast, block}, key_name, key_type, additional_args, state_type, impl_suffix) do
name = cast.fun.name
name = String.to_atom(String.replace_suffix(Atom.to_string(name), "", impl_suffix))
arglistcl_type = [{:::, [], [key_name, key_type]}
|Enum.map(cast.fun.arguments, &({:::, [], [&1.name, &1.type]}))] ++ additional_args ++ [
{:::, [], [{:state, [], nil}, state_type]}
]
arglistcl = [key_name
|Enum.map(cast.fun.arguments, &(&1.name))] ++
Enum.map(additional_args, &(case &1 do
{:::, [], [name, _]} -> name
end)) ++ [{:state, [], nil}]
quote do
@doc false
@spec unquote({name, [], arglistcl_type}) :: unquote(state_type)
def unquote({name, [], arglistcl}) do
unquote(block)
end
end
end
defp cast_server(cast, key_name, key_type, additional_args, state_type, impl_suffix) do
name = cast.fun.name
name = String.to_atom(String.replace_suffix(Atom.to_string(name), "", impl_suffix))
arglistcl = [{:::, [], [key_name, key_type]}
|Enum.map(cast.fun.arguments, &({:::, [], [&1.name, &1.type]}))] ++ additional_args ++ [
{:::, [], [{:state, [], nil}, state_type]}
]
quote do
@callback unquote({name, [], arglistcl}) :: unquote(state_type)
end
end
defp call_behaviour(call, key_name, key_type, additional_args, state_type) do
name = call.fun.name
arglistcl = [{:::, [], [key_name, key_type]}
|Enum.map(call.fun.arguments, &({:::, [], [&1.name, &1.type]}))] ++ additional_args ++ [
{:::, [], [{:state, [], nil}, state_type]}
]
quote do
@callback unquote({name, [], arglistcl}) :: {unquote(state_type), unquote(call.ret)}
end
end
defp parse_specs(block, casts, calls, legit) do
case block do
[{:@, _, [{:doc, _, [docstring]}]},
{:@, _, [{:cast, _, [fun]}]}
|rest] ->
cast = %Cast{Cast.parse(fun)|doc: docstring}
parse_specs(rest, [cast|casts], calls, legit)
[{:@, _, [{:doc, _, [docstring]}]},
{:cast, _, [fun, [do: block]]}
|rest] ->
cast = %Cast{Cast.parse(fun)|doc: docstring}
parse_specs(rest, [{cast, block}|casts], calls, legit)
[{:@, _, [{:doc, _, [docstring]}]},
{:@, _, [{:call, _, [fun]}]}
|rest] ->
call = %Call{Call.parse(fun)|doc: docstring}
parse_specs(rest, casts, [call|calls], legit)
[{:@, _, [{:cast, _, [fun]}]}
|rest] ->
cast = Cast.parse(fun)
parse_specs(rest, [cast|casts], calls, legit)
[{:cast, _, [fun, [do: block]]}
|rest] ->
cast = Cast.parse(fun)
parse_specs(rest, [{cast, block}|casts], calls, legit)
[{:@, _, [{:call, _, [fun]}]}
|rest] ->
call = Call.parse(fun)
parse_specs(rest, casts, [call|calls], legit)
[x|rest] ->
parse_specs(rest, casts, calls, [x|legit])
[] -> {casts, calls, Enum.reverse(legit)}
end
end
end
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