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mazurka
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hypermedia api toolkit
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lib/mazurka/resource/error.ex
defmodule Mazurka.Resource.Error do
defexception [:message, :state]
def message(%{message: message}) do
inspect(message)
end
defmacro error(mediatype, name, [do: block]) do
Mazurka.Compiler.Utils.register(mediatype, __MODULE__, block, name)
end
def compile(mediatype, block, globals, {_, _, [arg]}) do
quote do
unquote_splicing(globals[:param] || [])
unquote_splicing(globals[:let] || [])
unquote(arg) = prop(:error)
error = unquote(mediatype).handle_error(unquote(block))
^^Mazurka.Resource.Error.set_error(error)
end
end
def expand(ast, _) do
Mazurka.Compiler.Utils.postwalk(ast, fn(expr) ->
expr
|> Mazurka.Resource.Param.format(:prop)
|> Mazurka.Resource.Input.format(:prop)
|> Mazurka.Resource.Resource.format(:prop)
end)
end
def format_name({name, _meta, _args}) when is_atom(name) do
name
end
def set_error([message], %{private: private} = conn, _parent, _ref, _attrs) do
private = Map.put(private, :mazurka_error, true)
:erlang.error(__MODULE__.exception([message: message, state: %{conn | private: private}]))
end
end