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composite.ex
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composite.ex
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defmodule HL7.Composite do
@moduledoc "Generic functions used by HL7 composite field macros"
@type spec :: {name :: atom, HL7.Type.value_type() | module}
@type option ::
{:separators, [{key :: atom, separator :: byte}]}
| {:trim, boolean}
@callback spec(atom) :: {index :: pos_integer, HL7.Type.value_type() | module}
@doc """
Given a tuple representing the declaration of a component or subcomponent of a field, return a
tuple with the corresponding list of indexes (1-based) for the item in the composite and its type.
The function will raise an exception if any of the passed component or subcomponent key names
are invalid.
## Examples
alias HL7.Composite.Default.{CE, CP, CX}
alias HL7.Composite
iex> Composite.spec!({CE, :text})
{{2}, :string}
iex> Composite.spec!({CX, :effective_date})
{{7}, :date}
iex> Composite.spec!({CP, :price, :quantity})
{{1, 1}, :float}
iex> Composite.spec!({CP, :price, :denomination})
{{1, 2}, :string}
"""
def spec!({component_mod, component_key})
when is_atom(component_mod) and is_atom(component_key) do
{component_index, type} =
component_mod
|> item_spec!(component_key)
{{component_index}, type}
end
def spec!({component_mod, component_key, subcomponent_key})
when is_atom(component_mod) and is_atom(component_key) and
is_atom(subcomponent_key) do
{component_index, subcomponent_mod} =
component_mod
|> item_spec!(component_key)
{subcomponent_index, type} =
subcomponent_mod
|> item_spec!(subcomponent_key)
{{component_index, subcomponent_index}, type}
end
defp item_spec!(composite_mod, item_key) do
composite_mod
|> apply(:spec, [])
|> item_spec(item_key, 1)
|> case do
result = {_index, _type} ->
result
nil ->
raise ArgumentError,
"could not find element '#{inspect(item_key)}' in " <>
"composite #{inspect(composite_mod)}"
end
end
defp item_spec([{key, type} | tail], item_key, index) do
case item_key do
^key -> {index, type}
_ -> item_spec(tail, item_key, index + 1)
end
end
defp item_spec([], _item_key, _index) do
nil
end
end