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iteraptor
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0.1.0
This small library allows the deep iteration / mapping of Enumerables.
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lib/iteraptor.ex
defmodule Iteraptor do
@joiner "."
@doc """
iex> [:a, 42] |> Iteraptor.to_flatmap
%{"0": :a, "1": 42}
iex> %{a: 42} |> Iteraptor.to_flatmap
%{a: 42}
iex> %{a: 42, b: 42} |> Iteraptor.to_flatmap
%{a: 42, b: 42}
iex> %{a: %{b: 42}, d: 42} |> Iteraptor.to_flatmap
%{"a.b": 42, d: 42}
iex> %{a: [:b, 42], d: 42} |> Iteraptor.to_flatmap
%{"a.0": :b, "a.1": 42, d: 42}
iex> %{a: %{b: [:c, 42]}, d: 42} |> Iteraptor.to_flatmap
%{"a.b.0": :c, "a.b.1": 42, d: 42}
iex> %{a: %{b: 42}} |> Iteraptor.to_flatmap
%{"a.b": 42}
iex> %{a: %{b: %{c: 42}}} |> Iteraptor.to_flatmap
%{"a.b.c": 42}
iex> %{a: %{b: %{c: 42}}, d: 42} |> Iteraptor.to_flatmap
%{"a.b.c": 42, d: 42}
iex> %{a: %{b: %{c: 42, d: [nil, 42]}, e: [:f, 42]}} |> Iteraptor.to_flatmap
%{"a.b.c": 42, "a.b.d.0": nil, "a.b.d.1": 42, "a.e.0": :f, "a.e.1": 42}
"""
def to_flatmap(input, joiner \\ @joiner) when is_map(input) or is_list(input) do
process(input, joiner)
end
##############################################################################
defp process(input, joiner, prefix \\ "", acc \\ %{})
##############################################################################
defp process(input, joiner, prefix, acc) when is_map(input) do
input |> Enum.reduce(acc, fn({k, v}, memo) ->
prefix = join(prefix, k, joiner)
if is_map(v) or is_list(v) do
process(v, joiner, prefix, memo)
else
Map.put memo, prefix, v
end
end)
end
defp process(input, joiner, prefix, acc) when is_list(input) do
input
|> Enum.with_index
|> Enum.map(fn({k, v}) -> {v, k} end)
|> Enum.into(%{})
|> process(joiner, prefix, acc)
end
##############################################################################
defp join(l, "", _) do
String.to_atom(to_string(l))
end
defp join("", r, _) do
String.to_atom(to_string(r))
end
defp join(l, r, joiner) do
String.to_atom(to_string(l) <> joiner <> to_string(r))
end
end