lib/errors/syntax_error.ex
defmodule Formulae.SyntaxError do
defexception [:formula, :error, :message]
def exception(value) do
{what, how} = value[:error]
message = "Formula [#{value[:formula]}] syntax is incorrect (#{what}): #{how}."
%Formulae.SyntaxError{formula: value[:formula], message: message}
end
end